patch-2.1.102 linux/drivers/scsi/NCR5380.c
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- Lines: 5142
- Date:
Mon May 11 13:19:45 1998
- Orig file:
v2.1.101/linux/drivers/scsi/NCR5380.c
- Orig date:
Tue Apr 14 14:29:21 1998
diff -u --recursive --new-file v2.1.101/linux/drivers/scsi/NCR5380.c linux/drivers/scsi/NCR5380.c
@@ -3,16 +3,16 @@
#endif
/*
* NCR 5380 generic driver routines. These should make it *trivial*
- * to implement 5380 SCSI drivers under Linux with a non-trantor
- * architecture.
+ * to implement 5380 SCSI drivers under Linux with a non-trantor
+ * architecture.
*
- * Note that these routines also work with NR53c400 family chips.
+ * Note that these routines also work with NR53c400 family chips.
*
* Copyright 1993, Drew Eckhardt
- * Visionary Computing
- * (Unix and Linux consulting and custom programming)
- * drew@colorado.edu
- * +1 (303) 666-5836
+ * Visionary Computing
+ * (Unix and Linux consulting and custom programming)
+ * drew@colorado.edu
+ * +1 (303) 666-5836
*
* DISTRIBUTION RELEASE 6.
*
@@ -31,7 +31,7 @@
/*
* $Log: NCR5380.c,v $
- * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
+ * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com)
* added proc_info
* added support needed for DTC 3180/3280
* fixed a couple of bugs
@@ -68,7 +68,7 @@
* 3. Test USLEEP code
*
* 4. Test SCSI-II tagged queueing (I have no devices which support
- * tagged queueing)
+ * tagged queueing)
*
* 5. Test linked command handling code after Eric is ready with
* the high level code.
@@ -201,21 +201,21 @@
*
* These macros control options :
* AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
- * defined.
+ * defined.
*
* AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
- * for commands that return with a CHECK CONDITION status.
+ * for commands that return with a CHECK CONDITION status.
*
* DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
- * transceivers.
+ * transceivers.
*
* DONT_USE_INTR - if defined, never use interrupts, even if we probe or
- * override-configure an IRQ.
+ * override-configure an IRQ.
*
* LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
- * bytes at a time. Since interrupts are disabled by default during
- * these transfers, we might need this to give reasonable interrupt
- * service time if the transfer size gets too large.
+ * bytes at a time. Since interrupts are disabled by default during
+ * these transfers, we might need this to give reasonable interrupt
+ * service time if the transfer size gets too large.
*
* LINKED - if defined, linked commands are supported.
*
@@ -224,20 +224,20 @@
* REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
*
* REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
- * rely on phase mismatch and EOP interrupts to determine end
- * of phase.
+ * rely on phase mismatch and EOP interrupts to determine end
+ * of phase.
*
* SCSI2 - if defined, SCSI-2 tagged queuing is used where possible
*
* UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You
- * only really want to use this if you're having a problem with
- * dropped characters during high speed communications, and even
- * then, you're going to be better off twiddling with transfersize
- * in the high level code.
+ * only really want to use this if you're having a problem with
+ * dropped characters during high speed communications, and even
+ * then, you're going to be better off twiddling with transfersize
+ * in the high level code.
*
* USLEEP - if defined, on devices that aren't disconnecting from the
- * bus, we will go to sleep so that the CPU can get real work done
- * when we run a command that won't complete immediately.
+ * bus, we will go to sleep so that the CPU can get real work done
+ * when we run a command that won't complete immediately.
*
* Note that if USLEEP is defined, NCR5380_TIMER *must* also be
* defined.
@@ -252,27 +252,27 @@
*
* These macros MUST be defined :
* NCR5380_local_declare() - declare any local variables needed for your
- * transfer routines.
+ * transfer routines.
*
* NCR5380_setup(instance) - initialize any local variables needed from a given
- * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
+ * instance of the host adapter for NCR5380_{read,write,pread,pwrite}
*
* NCR5380_read(register) - read from the specified register
*
* NCR5380_write(register, value) - write to the specific register
*
* NCR5380_implementation_fields - additional fields needed for this
- * specific implementation of the NCR5380
+ * specific implementation of the NCR5380
*
* Either real DMA *or* pseudo DMA may be implemented
* REAL functions :
* NCR5380_REAL_DMA should be defined if real DMA is to be used.
* Note that the DMA setup functions should return the number of bytes
- * that they were able to program the controller for.
+ * that they were able to program the controller for.
*
* Also note that generic i386/PC versions of these macros are
- * available as NCR5380_i386_dma_write_setup,
- * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
+ * available as NCR5380_i386_dma_write_setup,
+ * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
*
* NCR5380_dma_write_setup(instance, src, count) - initialize
* NCR5380_dma_read_setup(instance, dst, count) - initialize
@@ -304,8 +304,8 @@
* code finishes, NCR5380_print_options should be called.
*/
-static int do_abort (struct Scsi_Host *host);
-static void do_reset (struct Scsi_Host *host);
+static int do_abort(struct Scsi_Host *host);
+static void do_reset(struct Scsi_Host *host);
static struct Scsi_Host *first_instance = NULL;
static Scsi_Host_Template *the_template = NULL;
@@ -313,49 +313,112 @@
* Function : void initialize_SCp(Scsi_Cmnd *cmd)
*
* Purpose : initialize the saved data pointers for cmd to point to the
- * start of the buffer.
+ * start of the buffer.
*
* Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
*/
-static __inline__ void initialize_SCp(Scsi_Cmnd *cmd) {
- /*
- * Initialize the Scsi Pointer field so that all of the commands in the
- * various queues are valid.
- */
-
- if (cmd->use_sg) {
- cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
- cmd->SCp.buffers_residual = cmd->use_sg - 1;
- cmd->SCp.ptr = (char *) cmd->SCp.buffer->address;
- cmd->SCp.this_residual = cmd->SCp.buffer->length;
- } else {
- cmd->SCp.buffer = NULL;
- cmd->SCp.buffers_residual = 0;
- cmd->SCp.ptr = (char *) cmd->request_buffer;
- cmd->SCp.this_residual = cmd->request_bufflen;
- }
+static __inline__ void initialize_SCp(Scsi_Cmnd * cmd)
+{
+ /*
+ * Initialize the Scsi Pointer field so that all of the commands in the
+ * various queues are valid.
+ */
+
+ if (cmd->use_sg) {
+ cmd->SCp.buffer = (struct scatterlist *) cmd->buffer;
+ cmd->SCp.buffers_residual = cmd->use_sg - 1;
+ cmd->SCp.ptr = (char *) cmd->SCp.buffer->address;
+ cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ } else {
+ cmd->SCp.buffer = NULL;
+ cmd->SCp.buffers_residual = 0;
+ cmd->SCp.ptr = (char *) cmd->request_buffer;
+ cmd->SCp.this_residual = cmd->request_bufflen;
+ }
}
#include <linux/delay.h>
#ifdef NDEBUG
static struct {
- unsigned char mask;
- const char * name;}
-signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
- { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
- { SR_SEL, "SEL" }, {0, NULL}},
-basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}},
-icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
- {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
- {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
- {0, NULL}},
-mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
- {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
- "MODE PARITY INTR"}, {MR_MONITOR_BSY, "MODE MONITOR BSY"},
- {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
- {0, NULL}};
+ unsigned char mask;
+ const char *name;
+} signals[] = { {
+
+ SR_DBP, "PARITY"
+}, {
+ SR_RST, "RST"
+}, {
+ SR_BSY, "BSY"
+},
+{
+ SR_REQ, "REQ"
+}, {
+ SR_MSG, "MSG"
+}, {
+ SR_CD, "CD"
+}, {
+ SR_IO, "IO"
+},
+{
+ SR_SEL, "SEL"
+}, {
+ 0, NULL
+}
+},
+
+basrs[] = { {
+ BASR_ATN, "ATN"
+}, {
+ BASR_ACK, "ACK"
+}, {
+ 0, NULL
+}
+},
+
+icrs[] = { {
+ ICR_ASSERT_RST, "ASSERT RST"
+}, {
+ ICR_ASSERT_ACK, "ASSERT ACK"
+},
+{
+ ICR_ASSERT_BSY, "ASSERT BSY"
+}, {
+ ICR_ASSERT_SEL, "ASSERT SEL"
+},
+{
+ ICR_ASSERT_ATN, "ASSERT ATN"
+}, {
+ ICR_ASSERT_DATA, "ASSERT DATA"
+},
+{
+ 0, NULL
+}
+},
+
+mrs[] = { {
+ MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"
+}, {
+ MR_TARGET, "MODE TARGET"
+},
+{
+ MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"
+}, {
+ MR_ENABLE_PAR_INTR,
+ "MODE PARITY INTR"
+}, {
+ MR_MONITOR_BSY, "MODE MONITOR BSY"
+},
+{
+ MR_DMA_MODE, "MODE DMA"
+}, {
+ MR_ARBITRATE, "MODE ARBITRATION"
+},
+{
+ 0, NULL
+}
+};
/*
* Function : void NCR5380_print(struct Scsi_Host *instance)
@@ -365,43 +428,62 @@
* Input : instance - which NCR5380
*/
-static void NCR5380_print(struct Scsi_Host *instance) {
- NCR5380_local_declare();
- unsigned char status, data, basr, mr, icr, i;
- NCR5380_setup(instance);
- cli();
- data = NCR5380_read(CURRENT_SCSI_DATA_REG);
- status = NCR5380_read(STATUS_REG);
- mr = NCR5380_read(MODE_REG);
- icr = NCR5380_read(INITIATOR_COMMAND_REG);
- basr = NCR5380_read(BUS_AND_STATUS_REG);
- sti();
- printk("STATUS_REG: %02x ", status);
- for (i = 0; signals[i].mask ; ++i)
- if (status & signals[i].mask)
- printk(",%s", signals[i].name);
- printk("\nBASR: %02x ", basr);
- for (i = 0; basrs[i].mask ; ++i)
- if (basr & basrs[i].mask)
- printk(",%s", basrs[i].name);
- printk("\nICR: %02x ", icr);
- for (i = 0; icrs[i].mask; ++i)
- if (icr & icrs[i].mask)
- printk(",%s", icrs[i].name);
- printk("\nMODE: %02x ", mr);
- for (i = 0; mrs[i].mask; ++i)
- if (mr & mrs[i].mask)
- printk(",%s", mrs[i].name);
- printk("\n");
+static void NCR5380_print(struct Scsi_Host *instance)
+{
+ NCR5380_local_declare();
+ unsigned long flags;
+ unsigned char status, data, basr, mr, icr, i;
+ NCR5380_setup(instance);
+ save_flags(flags);
+ cli();
+ data = NCR5380_read(CURRENT_SCSI_DATA_REG);
+ status = NCR5380_read(STATUS_REG);
+ mr = NCR5380_read(MODE_REG);
+ icr = NCR5380_read(INITIATOR_COMMAND_REG);
+ basr = NCR5380_read(BUS_AND_STATUS_REG);
+ restore_flags(flags);
+ printk("STATUS_REG: %02x ", status);
+ for (i = 0; signals[i].mask; ++i)
+ if (status & signals[i].mask)
+ printk(",%s", signals[i].name);
+ printk("\nBASR: %02x ", basr);
+ for (i = 0; basrs[i].mask; ++i)
+ if (basr & basrs[i].mask)
+ printk(",%s", basrs[i].name);
+ printk("\nICR: %02x ", icr);
+ for (i = 0; icrs[i].mask; ++i)
+ if (icr & icrs[i].mask)
+ printk(",%s", icrs[i].name);
+ printk("\nMODE: %02x ", mr);
+ for (i = 0; mrs[i].mask; ++i)
+ if (mr & mrs[i].mask)
+ printk(",%s", mrs[i].name);
+ printk("\n");
}
static struct {
- unsigned char value;
- const char *name;
+ unsigned char value;
+ const char *name;
} phases[] = {
-{PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
-{PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
-{PHASE_UNKNOWN, "UNKNOWN"}};
+
+ {
+ PHASE_DATAOUT, "DATAOUT"
+ }, {
+ PHASE_DATAIN, "DATAIN"
+ }, {
+ PHASE_CMDOUT, "CMDOUT"
+ },
+ {
+ PHASE_STATIN, "STATIN"
+ }, {
+ PHASE_MSGOUT, "MSGOUT"
+ }, {
+ PHASE_MSGIN, "MSGIN"
+ },
+ {
+ PHASE_UNKNOWN, "UNKNOWN"
+ }
+};
/*
* Function : void NCR5380_print_phase(struct Scsi_Host *instance)
@@ -411,21 +493,22 @@
* Input : instance - which NCR5380
*/
-static void NCR5380_print_phase(struct Scsi_Host *instance) {
- NCR5380_local_declare();
- unsigned char status;
- int i;
- NCR5380_setup(instance);
-
- status = NCR5380_read(STATUS_REG);
- if (!(status & SR_REQ))
- printk("scsi%d : REQ not asserted, phase unknown.\n",
- instance->host_no);
- else {
- for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
- (phases[i].value != (status & PHASE_MASK)); ++i);
- printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
- }
+static void NCR5380_print_phase(struct Scsi_Host *instance)
+{
+ NCR5380_local_declare();
+ unsigned char status;
+ int i;
+ NCR5380_setup(instance);
+
+ status = NCR5380_read(STATUS_REG);
+ if (!(status & SR_REQ))
+ printk("scsi%d : REQ not asserted, phase unknown.\n",
+ instance->host_no);
+ else {
+ for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
+ (phases[i].value != (status & PHASE_MASK)); ++i);
+ printk("scsi%d : phase %s\n", instance->host_no, phases[i].name);
+ }
}
#endif
@@ -454,24 +537,26 @@
* Function : run_main(void)
*
* Purpose : insure that the coroutine is running and will process our
- * request. main_running is checked/set here (in an inline function)
- * rather than in NCR5380_main itself to reduce the chances of stack
- * overflow.
+ * request. main_running is checked/set here (in an inline function)
+ * rather than in NCR5380_main itself to reduce the chances of stack
+ * overflow.
*
*/
-static __inline__ void run_main(void) {
- cli();
- if (!main_running) {
- main_running = 1;
- NCR5380_main();
- /*
- * main_running is cleared in NCR5380_main once it can't do
- * more work, and NCR5380_main exits with interrupts disabled.
- */
- sti();
- } else
- sti();
+static __inline__ void run_main(void)
+{
+ unsigned long flags;
+ save_flags(flags);
+ cli();
+ if (!main_running) {
+ main_running = 1;
+ NCR5380_main();
+ /*
+ * main_running is cleared in NCR5380_main once it can't do
+ * more work, and NCR5380_main exits with interrupts disabled.
+ */
+ }
+ restore_flags(flags);
}
#ifdef USLEEP
@@ -498,116 +583,123 @@
#define USLEEP_POLL (200*HZ/1000)
#endif
-static struct Scsi_Host * expires_first = NULL;
+static struct Scsi_Host *expires_first = NULL;
/*
* Function : int should_disconnect (unsigned char cmd)
*
* Purpose : decide weather a command would normally disconnect or
- * not, since if it won't disconnect we should go to sleep.
+ * not, since if it won't disconnect we should go to sleep.
*
* Input : cmd - opcode of SCSI command
*
* Returns : DISCONNECT_LONG if we should disconnect for a really long
- * time (ie always, sleep, look for REQ active, sleep),
- * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
- * time-to-data delay, DISCONNECT_NONE if this command would return
- * immediately.
+ * time (ie always, sleep, look for REQ active, sleep),
+ * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal
+ * time-to-data delay, DISCONNECT_NONE if this command would return
+ * immediately.
*
* Future sleep algorithms based on time to data can exploit
* something like this so they can differentiate between "normal"
- * (ie, read, write, seek) and unusual commands (ie, * format).
+ * (ie, read, write, seek) and unusual commands (ie, * format).
*
* Note : We don't deal with commands that handle an immediate disconnect,
*
*/
-static int should_disconnect (unsigned char cmd) {
- switch (cmd) {
- case READ_6:
- case WRITE_6:
- case SEEK_6:
- case READ_10:
- case WRITE_10:
- case SEEK_10:
- return DISCONNECT_TIME_TO_DATA;
- case FORMAT_UNIT:
- case SEARCH_HIGH:
- case SEARCH_LOW:
- case SEARCH_EQUAL:
- return DISCONNECT_LONG;
- default:
- return DISCONNECT_NONE;
- }
+static int should_disconnect(unsigned char cmd)
+{
+ switch (cmd) {
+ case READ_6:
+ case WRITE_6:
+ case SEEK_6:
+ case READ_10:
+ case WRITE_10:
+ case SEEK_10:
+ return DISCONNECT_TIME_TO_DATA;
+ case FORMAT_UNIT:
+ case SEARCH_HIGH:
+ case SEARCH_LOW:
+ case SEARCH_EQUAL:
+ return DISCONNECT_LONG;
+ default:
+ return DISCONNECT_NONE;
+ }
}
/*
* Assumes instance->time_expires has been set in higher level code.
*/
-static int NCR5380_set_timer (struct Scsi_Host *instance) {
- struct Scsi_Host *tmp, **prev;
-
- cli();
- if (((struct NCR5380_hostdata *) (instance->host_data))->next_timer) {
- sti();
- return -1;
- }
-
- for (prev = &expires_first, tmp = expires_first; tmp;
- prev = &(((struct NCR5380_hostdata *) tmp->host_data)->next_timer),
- tmp = ((struct NCR5380_hostdata *) tmp->host_data)->next_timer)
- if (instance->time_expires < tmp->time_expires)
- break;
-
- instance->next_timer = tmp;
- *prev = instance;
- timer_table[NCR5380_TIMER].expires = expires_first->time_expires;
- timer_active |= 1 << NCR5380_TIMER;
- sti();
- return 0;
-}
+static int NCR5380_set_timer(struct Scsi_Host *instance)
+{
+ unsigned long flags;
+ struct Scsi_Host *tmp, **prev;
+
+ save_flags(flags);
+ cli();
+ if (((struct NCR5380_hostdata *) (instance->host_data))->next_timer) {
+ restore_flags(flags);
+ return -1;
+ }
+ for (prev = &expires_first, tmp = expires_first; tmp;
+ prev = &(((struct NCR5380_hostdata *) tmp->host_data)->next_timer),
+ tmp = ((struct NCR5380_hostdata *) tmp->host_data)->next_timer)
+ if (instance->time_expires < tmp->time_expires)
+ break;
+
+ instance->next_timer = tmp;
+ *prev = instance;
+ timer_table[NCR5380_TIMER].expires = expires_first->time_expires;
+ timer_active |= 1 << NCR5380_TIMER;
+ restore_flags(flags);
+ return 0;
+}
/* Doing something about unwanted reentrancy here might be useful */
-void NCR5380_timer_fn(void) {
- struct Scsi_Host *instance;
- cli();
- for (; expires_first && expires_first->time_expires >= jiffies; ) {
- instance = ((NCR5380_hostdata *) expires_first->host_data)->
- expires_next;
- ((NCR5380_hostdata *) expires_first->host_data)->expires_next =
- NULL;
- ((NCR5380_hostdata *) expires_first->host_data)->time_expires =
- 0;
- expires_first = instance;
- }
-
- if (expires_first) {
- timer_table[NCR5380_TIMER].expires = ((NCR5380_hostdata *)
- expires_first->host_data)->time_expires;
- timer_active |= (1 << NCR5380_TIMER);
- } else {
- timer_table[NCR5380_TIMER].expires = 0;
- timer_active &= ~(1 << MCR5380_TIMER);
- }
- sti();
-
- run_main();
-}
-#endif /* def USLEEP */
-
-static inline void NCR5380_all_init (void) {
- static int done = 0;
- if (!done) {
+void NCR5380_timer_fn(void)
+{
+ unsigned long flags;
+ struct Scsi_Host *instance;
+ save_flags(flags);
+ cli();
+ for (; expires_first && expires_first->time_expires >= jiffies;) {
+ instance = ((NCR5380_hostdata *) expires_first->host_data)->
+ expires_next;
+ ((NCR5380_hostdata *) expires_first->host_data)->expires_next =
+ NULL;
+ ((NCR5380_hostdata *) expires_first->host_data)->time_expires =
+ 0;
+ expires_first = instance;
+ }
+
+ if (expires_first) {
+ timer_table[NCR5380_TIMER].expires = ((NCR5380_hostdata *)
+ expires_first->host_data)->time_expires;
+ timer_active |= (1 << NCR5380_TIMER);
+ } else {
+ timer_table[NCR5380_TIMER].expires = 0;
+ timer_active &= ~(1 << MCR5380_TIMER);
+ }
+ restore_flags(flags);
+
+ run_main();
+}
+#endif /* def USLEEP */
+
+static inline void NCR5380_all_init(void)
+{
+ static int done = 0;
+ if (!done) {
#if (NDEBUG & NDEBUG_INIT)
- printk("scsi : NCR5380_all_init()\n");
+ printk("scsi : NCR5380_all_init()\n");
#endif
- done = 1;
+ done = 1;
#ifdef USLEEP
- timer_table[NCR5380_TIMER].expires = 0;
- timer_table[NCR5380_TIMER].fn = NCR5380_timer_fn;
+ timer_table[NCR5380_TIMER].expires = 0;
+ timer_table[NCR5380_TIMER].fn = NCR5380_timer_fn;
#endif
- }
+ }
}
#ifdef AUTOPROBE_IRQ
@@ -627,25 +719,27 @@
static int probe_irq __initdata = 0;
-__initfunc(static void probe_intr (int irq, void *dev_id, struct pt_regs * regs)) {
- probe_irq = irq;
-};
+__initfunc(static void probe_intr(int irq, void *dev_id, struct pt_regs *regs))
+{
+ probe_irq = irq;
+}
-__initfunc(static int NCR5380_probe_irq (struct Scsi_Host *instance, int possible)) {
- NCR5380_local_declare();
- struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
- instance->hostdata;
- unsigned long timeout;
- int trying_irqs, i, mask;
- NCR5380_setup(instance);
-
- for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
- if ((mask & possible) && (request_irq(i, &probe_intr, SA_INTERRUPT, "NCR-probe", NULL)
- == 0))
- trying_irqs |= mask;
+__initfunc(static int NCR5380_probe_irq(struct Scsi_Host *instance, int possible))
+{
+ NCR5380_local_declare();
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
+ instance->hostdata;
+ unsigned long timeout;
+ int trying_irqs, i, mask;
+ NCR5380_setup(instance);
+
+ for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1)
+ if ((mask & possible) && (request_irq(i, &probe_intr, SA_INTERRUPT, "NCR-probe", NULL)
+ == 0))
+ trying_irqs |= mask;
- timeout = jiffies + (250*HZ/1000);
- probe_irq = IRQ_NONE;
+ timeout = jiffies + (250 * HZ / 1000);
+ probe_irq = IRQ_NONE;
/*
* A interrupt is triggered whenever BSY = false, SEL = true
@@ -657,101 +751,103 @@
* to zero.
*/
- NCR5380_write(TARGET_COMMAND_REG, 0);
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA |
- ICR_ASSERT_SEL);
-
- while (probe_irq == IRQ_NONE && jiffies < timeout)
- barrier();
-
- NCR5380_write(SELECT_ENABLE_REG, 0);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
-
- for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
- if (trying_irqs & mask)
- free_irq(i, NULL);
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA |
+ ICR_ASSERT_SEL);
+
+ while (probe_irq == IRQ_NONE && jiffies < timeout)
+ barrier();
- return probe_irq;
+ NCR5380_write(SELECT_ENABLE_REG, 0);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+ for (i = 0, mask = 1; i < 16; ++i, mask <<= 1)
+ if (trying_irqs & mask)
+ free_irq(i, NULL);
+
+ return probe_irq;
}
-#endif /* AUTOPROBE_IRQ */
-
+#endif /* AUTOPROBE_IRQ */
+
/*
* Function : void NCR58380_print_options (struct Scsi_Host *instance)
*
* Purpose : called by probe code indicating the NCR5380 driver
- * options that were selected.
+ * options that were selected.
*
* Inputs : instance, pointer to this instance. Unused.
*/
-__initfunc(static void NCR5380_print_options (struct Scsi_Host *instance)) {
- printk(" generic options"
+__initfunc(static void NCR5380_print_options(struct Scsi_Host *instance))
+{
+ printk(" generic options"
#ifdef AUTOPROBE_IRQ
- " AUTOPROBE_IRQ"
+ " AUTOPROBE_IRQ"
#endif
-#ifdef AUTOSENSE
- " AUTOSENSE"
+#ifdef AUTOSENSE
+ " AUTOSENSE"
#endif
#ifdef DIFFERENTIAL
- " DIFFERENTIAL"
+ " DIFFERENTIAL"
#endif
#ifdef REAL_DMA
- " REAL DMA"
+ " REAL DMA"
#endif
#ifdef REAL_DMA_POLL
- " REAL DMA POLL"
+ " REAL DMA POLL"
#endif
#ifdef PARITY
- " PARITY"
+ " PARITY"
#endif
#ifdef PSEUDO_DMA
- " PSEUDO DMA"
+ " PSEUDO DMA"
#endif
#ifdef SCSI2
- " SCSI-2"
+ " SCSI-2"
#endif
#ifdef UNSAFE
- " UNSAFE "
+ " UNSAFE "
#endif
- );
+ );
#ifdef USLEEP
- printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
+ printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP);
#endif
- printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
- if (((struct NCR5380_hostdata *)instance->hostdata)->flags & FLAG_NCR53C400) {
- printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
- }
+ printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
+ if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) {
+ printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE);
+ }
}
/*
* Function : void NCR5380_print_status (struct Scsi_Host *instance)
*
* Purpose : print commands in the various queues, called from
- * NCR5380_abort and NCR5380_debug to aid debugging.
+ * NCR5380_abort and NCR5380_debug to aid debugging.
*
* Inputs : instance, pointer to this instance.
*/
-static void NCR5380_print_status (struct Scsi_Host *instance) {
- static char pr_bfr[512];
- char *start;
- int len;
-
- printk("NCR5380 : coroutine is%s running.\n",
- main_running ? "" : "n't");
-
+static void NCR5380_print_status(struct Scsi_Host *instance)
+{
+ static char pr_bfr[512];
+ char *start;
+ int len;
+
+ printk("NCR5380 : coroutine is%s running.\n",
+ main_running ? "" : "n't");
+
#ifdef NDEBUG
- NCR5380_print (instance);
- NCR5380_print_phase (instance);
+ NCR5380_print(instance);
+ NCR5380_print_phase(instance);
#endif
- len = NCR5380_proc_info(pr_bfr, &start, 0, sizeof(pr_bfr),
- instance->host_no, 0);
- pr_bfr[len] = 0;
- printk("\n%s\n", pr_bfr);
- }
+ len = NCR5380_proc_info(pr_bfr, &start, 0, sizeof(pr_bfr),
+ instance->host_no, 0);
+ pr_bfr[len] = 0;
+ printk("\n%s\n", pr_bfr);
+}
/******************************************/
/*
@@ -765,126 +861,130 @@
* inout: TRUE - user is writing; FALSE - user is reading
*
* Return the number of bytes read from or written
-*/
+ */
#undef SPRINTF
#define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0)
static
-char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
+char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length);
static
-char *lprint_command (unsigned char *cmd, char *pos, char *buffer, int len);
+char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len);
static
char *lprint_opcode(int opcode, char *pos, char *buffer, int length);
#ifndef NCR5380_proc_info
static
#endif
-int NCR5380_proc_info (
- char *buffer, char **start,off_t offset,
- int length,int hostno,int inout)
-{
- char *pos = buffer;
- struct Scsi_Host *instance;
- struct NCR5380_hostdata *hostdata;
- Scsi_Cmnd *ptr;
-
- for (instance = first_instance; instance &&
- instance->host_no != hostno; instance=instance->next)
- ;
- if (!instance)
- return(-ESRCH);
- hostdata = (struct NCR5380_hostdata *)instance->hostdata;
+int NCR5380_proc_info(
+ char *buffer, char **start, off_t offset,
+ int length, int hostno, int inout)
+{
+ unsigned long flags;
+ char *pos = buffer;
+ struct Scsi_Host *instance;
+ struct NCR5380_hostdata *hostdata;
+ Scsi_Cmnd *ptr;
+
+ for (instance = first_instance; instance &&
+ instance->host_no != hostno; instance = instance->next);
+ if (!instance)
+ return (-ESRCH);
+ hostdata = (struct NCR5380_hostdata *) instance->hostdata;
- if (inout) { /* Has data been written to the file ? */
+ if (inout) { /* Has data been written to the file ? */
#ifdef DTC_PUBLIC_RELEASE
- dtc_wmaxi = dtc_maxi = 0;
+ dtc_wmaxi = dtc_maxi = 0;
#endif
#ifdef PAS16_PUBLIC_RELEASE
- pas_wmaxi = pas_maxi = 0;
+ pas_wmaxi = pas_maxi = 0;
#endif
- return(-ENOSYS); /* Currently this is a no-op */
- }
- SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
- if (((struct NCR5380_hostdata *)instance->hostdata)->flags & FLAG_NCR53C400)
- SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
+ return (-ENOSYS); /* Currently this is a no-op */
+ }
+ SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE);
+ if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400)
+ SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE);
#ifdef DTC_PUBLIC_RELEASE
- SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
+ SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE);
#endif
#ifdef T128_PUBLIC_RELEASE
- SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
+ SPRINTF("T128 release %d", T128_PUBLIC_RELEASE);
#endif
#ifdef GENERIC_NCR5380_PUBLIC_RELEASE
- SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
+ SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE);
#endif
#ifdef PAS16_PUBLIC_RELEASE
-SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
+ SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE);
#endif
- SPRINTF("\nBase Addr: 0x%05lX ", (long)instance->base);
- SPRINTF("io_port: %04x ", (int)instance->io_port);
- if (instance->irq == IRQ_NONE)
- SPRINTF("IRQ: None.\n");
- else
- SPRINTF("IRQ: %d.\n", instance->irq);
+ SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base);
+ SPRINTF("io_port: %04x ", (int) instance->io_port);
+ if (instance->irq == IRQ_NONE)
+ SPRINTF("IRQ: None.\n");
+ else
+ SPRINTF("IRQ: %d.\n", instance->irq);
#ifdef DTC_PUBLIC_RELEASE
- SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n",
- dtc_wmaxi, dtc_maxi);
+ SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n",
+ dtc_wmaxi, dtc_maxi);
#endif
#ifdef PAS16_PUBLIC_RELEASE
- SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n",
- pas_wmaxi, pas_maxi);
+ SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n",
+ pas_wmaxi, pas_maxi);
#endif
- cli();
- SPRINTF("NCR5380 : coroutine is%s running.\n", main_running ? "" : "n't");
- if (!hostdata->connected)
- SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
- else
- pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected,
- pos, buffer, length);
- SPRINTF("scsi%d: issue_queue\n", instance->host_no);
- for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr;
- ptr = (Scsi_Cmnd *) ptr->host_scribble)
- pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
-
- SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
- for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
- ptr = (Scsi_Cmnd *) ptr->host_scribble)
- pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length);
-
- sti();
- *start=buffer;
- if (pos - buffer < offset)
- return 0;
- else if (pos - buffer - offset < length)
- return pos - buffer - offset;
- return length;
-}
-
-static
-char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length) {
- SPRINTF("scsi%d : destination target %d, lun %d\n",
- cmd->host->host_no, cmd->target, cmd->lun);
- SPRINTF(" command = ");
- pos = lprint_command (cmd->cmnd, pos, buffer, length);
- return (pos);
-}
-
-static
-char *lprint_command (unsigned char *command,
- char *pos, char *buffer, int length) {
- int i, s;
- pos = lprint_opcode(command[0], pos, buffer, length);
- for ( i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
- SPRINTF("%02x ", command[i]);
- SPRINTF("\n");
- return(pos);
-}
-
-static
-char *lprint_opcode(int opcode, char *pos, char *buffer, int length) {
- SPRINTF("%2d (0x%02x)", opcode, opcode);
- return(pos);
+ save_flags(flags);
+ cli();
+ SPRINTF("NCR5380 : coroutine is%s running.\n", main_running ? "" : "n't");
+ if (!hostdata->connected)
+ SPRINTF("scsi%d: no currently connected command\n", instance->host_no);
+ else
+ pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected,
+ pos, buffer, length);
+ SPRINTF("scsi%d: issue_queue\n", instance->host_no);
+ for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr;
+ ptr = (Scsi_Cmnd *) ptr->host_scribble)
+ pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
+
+ SPRINTF("scsi%d: disconnected_queue\n", instance->host_no);
+ for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
+ ptr = (Scsi_Cmnd *) ptr->host_scribble)
+ pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
+
+ restore_flags(flags);
+ *start = buffer;
+ if (pos - buffer < offset)
+ return 0;
+ else if (pos - buffer - offset < length)
+ return pos - buffer - offset;
+ return length;
+}
+
+static
+char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length)
+{
+ SPRINTF("scsi%d : destination target %d, lun %d\n",
+ cmd->host->host_no, cmd->target, cmd->lun);
+ SPRINTF(" command = ");
+ pos = lprint_command(cmd->cmnd, pos, buffer, length);
+ return (pos);
+}
+
+static
+char *lprint_command(unsigned char *command,
+ char *pos, char *buffer, int length)
+{
+ int i, s;
+ pos = lprint_opcode(command[0], pos, buffer, length);
+ for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
+ SPRINTF("%02x ", command[i]);
+ SPRINTF("\n");
+ return (pos);
+}
+
+static
+char *lprint_opcode(int opcode, char *pos, char *buffer, int length)
+{
+ SPRINTF("%2d (0x%02x)", opcode, opcode);
+ return (pos);
}
@@ -892,152 +992,152 @@
* Function : void NCR5380_init (struct Scsi_Host *instance, flags)
*
* Purpose : initializes *instance and corresponding 5380 chip,
- * with flags OR'd into the initial flags value.
+ * with flags OR'd into the initial flags value.
*
* Inputs : instance - instantiation of the 5380 driver.
*
* Notes : I assume that the host, hostno, and id bits have been
- * set correctly. I don't care about the irq and other fields.
+ * set correctly. I don't care about the irq and other fields.
*
*/
-__initfunc(static void NCR5380_init (struct Scsi_Host *instance, int flags)) {
- NCR5380_local_declare();
- int i, pass;
- unsigned long timeout;
- struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
+__initfunc(static void NCR5380_init(struct Scsi_Host *instance, int flags))
+{
+ NCR5380_local_declare();
+ int i, pass;
+ unsigned long timeout;
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
instance->hostdata;
- /*
- * On NCR53C400 boards, NCR5380 registers are mapped 8 past
- * the base address.
- */
+ /*
+ * On NCR53C400 boards, NCR5380 registers are mapped 8 past
+ * the base address.
+ */
#ifdef NCR53C400
- if (flags & FLAG_NCR53C400)
- instance->NCR5380_instance_name += NCR53C400_address_adjust;
+ if (flags & FLAG_NCR53C400)
+ instance->NCR5380_instance_name += NCR53C400_address_adjust;
#endif
- NCR5380_setup(instance);
+ NCR5380_setup(instance);
- NCR5380_all_init();
+ NCR5380_all_init();
- hostdata->aborted = 0;
- hostdata->id_mask = 1 << instance->this_id;
- for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
- if (i > hostdata->id_mask)
- hostdata->id_higher_mask |= i;
- for (i = 0; i < 8; ++i)
- hostdata->busy[i] = 0;
+ hostdata->aborted = 0;
+ hostdata->id_mask = 1 << instance->this_id;
+ for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
+ if (i > hostdata->id_mask)
+ hostdata->id_higher_mask |= i;
+ for (i = 0; i < 8; ++i)
+ hostdata->busy[i] = 0;
#ifdef REAL_DMA
- hostdata->dmalen = 0;
+ hostdata->dmalen = 0;
#endif
- hostdata->targets_present = 0;
- hostdata->connected = NULL;
- hostdata->issue_queue = NULL;
- hostdata->disconnected_queue = NULL;
+ hostdata->targets_present = 0;
+ hostdata->connected = NULL;
+ hostdata->issue_queue = NULL;
+ hostdata->disconnected_queue = NULL;
#ifdef NCR5380_STATS
- for (i = 0; i < 8; ++i) {
- hostdata->time_read[i] = 0;
- hostdata->time_write[i] = 0;
- hostdata->bytes_read[i] = 0;
- hostdata->bytes_write[i] = 0;
- }
- hostdata->timebase = 0;
- hostdata->pendingw = 0;
- hostdata->pendingr = 0;
-#endif
-
- /* The CHECK code seems to break the 53C400. Will check it later maybe */
- if (flags & FLAG_NCR53C400)
- hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
- else
- hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
-
- if (!the_template) {
- the_template = instance->hostt;
- first_instance = instance;
- }
-
+ for (i = 0; i < 8; ++i) {
+ hostdata->time_read[i] = 0;
+ hostdata->time_write[i] = 0;
+ hostdata->bytes_read[i] = 0;
+ hostdata->bytes_write[i] = 0;
+ }
+ hostdata->timebase = 0;
+ hostdata->pendingw = 0;
+ hostdata->pendingr = 0;
+#endif
+ /* The CHECK code seems to break the 53C400. Will check it later maybe */
+ if (flags & FLAG_NCR53C400)
+ hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
+ else
+ hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
+
+ if (!the_template) {
+ the_template = instance->hostt;
+ first_instance = instance;
+ }
#ifdef USLEEP
- hostdata->time_expires = 0;
- hostdata->next_timer = NULL;
+ hostdata->time_expires = 0;
+ hostdata->next_timer = NULL;
#endif
#ifndef AUTOSENSE
- if ((instance->cmd_per_lun > 1) || instance->can_queue > 1))
- printk("scsi%d : WARNING : support for multiple outstanding commands enabled\n"
- " without AUTOSENSE option, contingent allegiance conditions may\n"
+ if ((instance->cmd_per_lun > 1) || instance->can_queue > 1)
+ )
+ printk("scsi%d : WARNING : support for multiple outstanding commands enabled\n"
+ " without AUTOSENSE option, contingent allegiance conditions may\n"
" be incorrectly cleared.\n", instance->host_no);
-#endif /* def AUTOSENSE */
+#endif /* def AUTOSENSE */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- NCR5380_write(MODE_REG, MR_BASE);
- NCR5380_write(TARGET_COMMAND_REG, 0);
- NCR5380_write(SELECT_ENABLE_REG, 0);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+ NCR5380_write(SELECT_ENABLE_REG, 0);
#ifdef NCR53C400
- if (hostdata->flags & FLAG_NCR53C400) {
- NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
- }
-#endif
-
- /*
- * Detect and correct bus wedge problems.
- *
- * If the system crashed, it may have crashed in a state
- * where a SCSI command was still executing, and the
- * SCSI bus is not in a BUS FREE STATE.
- *
- * If this is the case, we'll try to abort the currently
- * established nexus which we know nothing about, and that
- * failing, do a hard reset of the SCSI bus
- */
-
- for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) &&
- pass <= 6 ; ++pass) {
- switch (pass) {
- case 1:
- case 3:
- case 5:
- printk("scsi%d: SCSI bus busy, waiting up to five seconds\n",
- instance->host_no);
- timeout = jiffies + 5*HZ;
- while (jiffies < timeout && (NCR5380_read(STATUS_REG) & SR_BSY));
- break;
- case 2:
- printk("scsi%d: bus busy, attempting abort\n",
- instance->host_no);
- do_abort (instance);
- break;
- case 4:
- printk("scsi%d: bus busy, attempting reset\n",
- instance->host_no);
- do_reset (instance);
- break;
- case 6:
- printk("scsi%d: bus locked solid or invalid override\n",
- instance->host_no);
+ if (hostdata->flags & FLAG_NCR53C400) {
+ NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE);
+ }
+#endif
+
+ /*
+ * Detect and correct bus wedge problems.
+ *
+ * If the system crashed, it may have crashed in a state
+ * where a SCSI command was still executing, and the
+ * SCSI bus is not in a BUS FREE STATE.
+ *
+ * If this is the case, we'll try to abort the currently
+ * established nexus which we know nothing about, and that
+ * failing, do a hard reset of the SCSI bus
+ */
+
+ for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) &&
+ pass <= 6; ++pass) {
+ switch (pass) {
+ case 1:
+ case 3:
+ case 5:
+ printk("scsi%d: SCSI bus busy, waiting up to five seconds\n",
+ instance->host_no);
+ timeout = jiffies + 5 * HZ;
+ while (jiffies < timeout && (NCR5380_read(STATUS_REG) & SR_BSY));
+ break;
+ case 2:
+ printk("scsi%d: bus busy, attempting abort\n",
+ instance->host_no);
+ do_abort(instance);
+ break;
+ case 4:
+ printk("scsi%d: bus busy, attempting reset\n",
+ instance->host_no);
+ do_reset(instance);
+ break;
+ case 6:
+ printk("scsi%d: bus locked solid or invalid override\n",
+ instance->host_no);
+ }
}
- }
}
/*
* Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
- * void (*done)(Scsi_Cmnd *))
+ * void (*done)(Scsi_Cmnd *))
*
* Purpose : enqueues a SCSI command
*
* Inputs : cmd - SCSI command, done - function called on completion, with
- * a pointer to the command descriptor.
+ * a pointer to the command descriptor.
*
* Returns : 0
*
* Side effects :
* cmd is added to the per instance issue_queue, with minor
- * twiddling done to the host specific fields of cmd. If the
- * main coroutine is not running, it is restarted.
+ * twiddling done to the host specific fields of cmd. If the
+ * main coroutine is not running, it is restarted.
*
*/
@@ -1045,237 +1145,239 @@
#ifndef NCR5380_queue_command
static
#endif
-int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *)) {
- struct Scsi_Host *instance = cmd->host;
- struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
- instance->hostdata;
- Scsi_Cmnd *tmp;
+int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) {
+ struct Scsi_Host *instance = cmd->host;
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
+ instance->hostdata;
+ Scsi_Cmnd *tmp;
#if (NDEBUG & NDEBUG_NO_WRITE)
- switch (cmd->cmnd[0]) {
- case WRITE_6:
- case WRITE_10:
- printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n",
- instance->host_no);
- cmd->result = (DID_ERROR << 16);
- done(cmd);
- return 0;
- }
-#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
+ switch (cmd->cmnd[0]) {
+ case WRITE_6:
+ case WRITE_10:
+ printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n",
+ instance->host_no);
+ cmd->result = (DID_ERROR << 16);
+ done(cmd);
+ return 0;
+ }
+#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
#ifdef NCR5380_STATS
-# if 0
- if (!hostdata->connected && !hostdata->issue_queue &&
- !hostdata->disconnected_queue) {
- hostdata->timebase = jiffies;
- }
-# endif
-# ifdef NCR5380_STAT_LIMIT
- if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
-# endif
- switch (cmd->cmnd[0])
- {
- case WRITE:
- case WRITE_6:
- case WRITE_10:
- hostdata->time_write[cmd->target] -= (jiffies - hostdata->timebase);
- hostdata->bytes_write[cmd->target] += cmd->request_bufflen;
- hostdata->pendingw++;
- break;
- case READ:
- case READ_6:
- case READ_10:
- hostdata->time_read[cmd->target] -= (jiffies - hostdata->timebase);
- hostdata->bytes_read[cmd->target] += cmd->request_bufflen;
- hostdata->pendingr++;
- break;
+#if 0
+ if (!hostdata->connected && !hostdata->issue_queue &&
+ !hostdata->disconnected_queue) {
+ hostdata->timebase = jiffies;
}
#endif
+#ifdef NCR5380_STAT_LIMIT
+ if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
+#endif
+ switch (cmd->cmnd[0]) {
+ case WRITE:
+ case WRITE_6:
+ case WRITE_10:
+ hostdata->time_write[cmd->target] -= (jiffies - hostdata->timebase);
+ hostdata->bytes_write[cmd->target] += cmd->request_bufflen;
+ hostdata->pendingw++;
+ break;
+ case READ:
+ case READ_6:
+ case READ_10:
+ hostdata->time_read[cmd->target] -= (jiffies - hostdata->timebase);
+ hostdata->bytes_read[cmd->target] += cmd->request_bufflen;
+ hostdata->pendingr++;
+ break;
+ }
+#endif
+
+ /*
+ * We use the host_scribble field as a pointer to the next command
+ * in a queue
+ */
+
+ cmd->host_scribble = NULL;
+ cmd->scsi_done = done;
- /*
- * We use the host_scribble field as a pointer to the next command
- * in a queue
- */
-
- cmd->host_scribble = NULL;
- cmd->scsi_done = done;
-
- cmd->result = 0;
-
-
- /*
- * Insert the cmd into the issue queue. Note that REQUEST SENSE
- * commands are added to the head of the queue since any command will
- * clear the contingent allegiance condition that exists and the
- * sense data is only guaranteed to be valid while the condition exists.
- */
-
- cli();
- if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
- LIST(cmd, hostdata->issue_queue);
- cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
- hostdata->issue_queue = cmd;
- } else {
- for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble;
- tmp = (Scsi_Cmnd *) tmp->host_scribble);
- LIST(cmd, tmp);
- tmp->host_scribble = (unsigned char *) cmd;
- }
+ cmd->result = 0;
+
+
+ /*
+ * Insert the cmd into the issue queue. Note that REQUEST SENSE
+ * commands are added to the head of the queue since any command will
+ * clear the contingent allegiance condition that exists and the
+ * sense data is only guaranteed to be valid while the condition exists.
+ */
+
+ cli();
+ if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
+ LIST(cmd, hostdata->issue_queue);
+ cmd->host_scribble = (unsigned char *) hostdata->issue_queue;
+ hostdata->issue_queue = cmd;
+ } else {
+ for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble;
+ tmp = (Scsi_Cmnd *) tmp->host_scribble);
+ LIST(cmd, tmp);
+ tmp->host_scribble = (unsigned char *) cmd;
+ }
#if (NDEBUG & NDEBUG_QUEUES)
- printk("scsi%d : command added to %s of queue\n", instance->host_no,
- (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
+ printk("scsi%d : command added to %s of queue\n", instance->host_no,
+ (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
#endif
/* Run the coroutine if it isn't already running. */
- run_main();
- return 0;
+ run_main();
+ return 0;
}
/*
* Function : NCR5380_main (void)
*
* Purpose : NCR5380_main is a coroutine that runs as long as more work can
- * be done on the NCR5380 host adapters in a system. Both
- * NCR5380_queue_command() and NCR5380_intr() will try to start it
- * in case it is not running.
+ * be done on the NCR5380 host adapters in a system. Both
+ * NCR5380_queue_command() and NCR5380_intr() will try to start it
+ * in case it is not running.
*
* NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
* reenable them. This prevents reentrancy and kernel stack overflow.
- */
-
-static void NCR5380_main (void) {
- Scsi_Cmnd *tmp, *prev;
- struct Scsi_Host *instance;
- struct NCR5380_hostdata *hostdata;
- int done;
-
- /*
- * We run (with interrupts disabled) until we're sure that none of
- * the host adapters have anything that can be done, at which point
- * we set main_running to 0 and exit.
- *
- * Interrupts are enabled before doing various other internal
- * instructions, after we've decided that we need to run through
- * the loop again.
- *
- * this should prevent any race conditions.
- */
-
- do {
- cli(); /* Freeze request queues */
- done = 1;
- for (instance = first_instance; instance &&
- instance->hostt == the_template; instance=instance->next) {
- hostdata = (struct NCR5380_hostdata *) instance->hostdata;
- cli();
- if (!hostdata->connected) {
+ */
+
+static void NCR5380_main(void) {
+ Scsi_Cmnd *tmp, *prev;
+ struct Scsi_Host *instance;
+ struct NCR5380_hostdata *hostdata;
+ int done;
+
+ /*
+ * We run (with interrupts disabled) until we're sure that none of
+ * the host adapters have anything that can be done, at which point
+ * we set main_running to 0 and exit.
+ *
+ * Interrupts are enabled before doing various other internal
+ * instructions, after we've decided that we need to run through
+ * the loop again.
+ *
+ * this should prevent any race conditions.
+ */
+
+ do {
+ cli(); /* Freeze request queues */
+ done = 1;
+ for (instance = first_instance; instance &&
+ instance->hostt == the_template; instance = instance->next) {
+ unsigned long flags;
+ hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+ save_flags(flags);
+ cli();
+ if (!hostdata->connected) {
#if (NDEBUG & NDEBUG_MAIN)
- printk("scsi%d : not connected\n", instance->host_no);
+ printk("scsi%d : not connected\n", instance->host_no);
#endif
- /*
- * Search through the issue_queue for a command destined
- * for a target that's not busy.
- */
+ /*
+ * Search through the issue_queue for a command destined
+ * for a target that's not busy.
+ */
#if (NDEBUG & NDEBUG_LISTS)
- for (tmp= (Scsi_Cmnd *) hostdata->issue_queue, prev=NULL; tmp && (tmp != prev); prev=tmp, tmp=(Scsi_Cmnd*)tmp->host_scribble)
- ;
- /*printk("%p ", tmp);*/
- if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/
-#endif
- for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
- prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *)
- tmp->host_scribble) {
+ for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp && (tmp != prev); prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble);
+ /*printk("%p ", tmp); */
+ if ((tmp == prev) && tmp)
+ printk(" LOOP\n"); /* else printk("\n"); */
+#endif
+ for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
+ prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *)
+ tmp->host_scribble) {
#if (NDEBUG & NDEBUG_LISTS)
- if (prev != tmp)
- printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun);
+ if (prev != tmp)
+ printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun);
#endif
- /* When we find one, remove it from the issue queue. */
- if (!(hostdata->busy[tmp->target] & (1 << tmp->lun))) {
- if (prev) {
- REMOVE(prev,prev->host_scribble,tmp,tmp->host_scribble);
- prev->host_scribble = tmp->host_scribble;
- } else {
- REMOVE(-1,hostdata->issue_queue,tmp,tmp->host_scribble);
- hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
- }
- tmp->host_scribble = NULL;
-
- /* reenable interrupts after finding one */
- sti();
-
- /*
- * Attempt to establish an I_T_L nexus here.
- * On success, instance->hostdata->connected is set.
- * On failure, we must add the command back to the
- * issue queue so we can keep trying.
- */
+ /* When we find one, remove it from the issue queue. */
+ if (!(hostdata->busy[tmp->target] & (1 << tmp->lun))) {
+ if (prev) {
+ REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
+ prev->host_scribble = tmp->host_scribble;
+ } else {
+ REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble);
+ hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble;
+ }
+ tmp->host_scribble = NULL;
+
+ /* reenable interrupts after finding one */
+ restore_flags(flags);
+
+ /*
+ * Attempt to establish an I_T_L nexus here.
+ * On success, instance->hostdata->connected is set.
+ * On failure, we must add the command back to the
+ * issue queue so we can keep trying.
+ */
#if (NDEBUG & (NDEBUG_MAIN | NDEBUG_QUEUES))
- printk("scsi%d : main() : command for target %d lun %d removed from issue_queue\n",
- instance->host_no, tmp->target, tmp->lun);
+ printk("scsi%d : main() : command for target %d lun %d removed from issue_queue\n",
+ instance->host_no, tmp->target, tmp->lun);
#endif
-
- /*
- * A successful selection is defined as one that
- * leaves us with the command connected and
- * in hostdata->connected, OR has terminated the
- * command.
- *
- * With successful commands, we fall through
- * and see if we can do an information transfer,
- * with failures we will restart.
- */
- if (!NCR5380_select(instance, tmp,
- /*
- * REQUEST SENSE commands are issued without tagged
- * queueing, even on SCSI-II devices because the
- * contingent allegiance condition exists for the
- * entire unit.
- */
- (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
- TAG_NEXT)) {
- break;
- } else {
- cli();
- LIST(tmp, hostdata->issue_queue);
- tmp->host_scribble = (unsigned char *)
- hostdata->issue_queue;
- hostdata->issue_queue = tmp;
- done = 0;
- sti();
+ /*
+ * A successful selection is defined as one that
+ * leaves us with the command connected and
+ * in hostdata->connected, OR has terminated the
+ * command.
+ *
+ * With successful commands, we fall through
+ * and see if we can do an information transfer,
+ * with failures we will restart.
+ */
+
+ if (!NCR5380_select(instance, tmp,
+ /*
+ * REQUEST SENSE commands are issued without tagged
+ * queueing, even on SCSI-II devices because the
+ * contingent allegiance condition exists for the
+ * entire unit.
+ */
+ (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
+ TAG_NEXT)) {
+ break;
+ } else {
+ unsigned long flags;
+ save_flags(flags);
+ cli();
+ LIST(tmp, hostdata->issue_queue);
+ tmp->host_scribble = (unsigned char *)
+ hostdata->issue_queue;
+ hostdata->issue_queue = tmp;
+ done = 0;
+ restore_flags(flags);
#if (NDEBUG & (NDEBUG_MAIN | NDEBUG_QUEUES))
- printk("scsi%d : main(): select() failed, returned to issue_queue\n",
- instance->host_no);
+ printk("scsi%d : main(): select() failed, returned to issue_queue\n",
+ instance->host_no);
#endif
- }
- } /* if target/lun is not busy */
- } /* for */
- } /* if (!hostdata->connected) */
-
- if (hostdata->connected
+ }
+ } /* if target/lun is not busy */
+ } /* for */
+ } /* if (!hostdata->connected) */
+ if (hostdata->connected
#ifdef REAL_DMA
- && !hostdata->dmalen
+ && !hostdata->dmalen
#endif
#ifdef USLEEP
- && (!hostdata->time_expires || hostdata->time_expires >= jiffies)
+ && (!hostdata->time_expires || hostdata->time_expires >= jiffies)
#endif
- ) {
- sti();
+ ) {
+ restore_flags(flags);
#if (NDEBUG & NDEBUG_MAIN)
- printk("scsi%d : main() : performing information transfer\n",
- instance->host_no);
+ printk("scsi%d : main() : performing information transfer\n",
+ instance->host_no);
#endif
- NCR5380_information_transfer(instance);
+ NCR5380_information_transfer(instance);
#if (NDEBUG & NDEBUG_MAIN)
- printk("scsi%d : main() : done set false\n", instance->host_no);
+ printk("scsi%d : main() : done set false\n", instance->host_no);
#endif
- done = 0;
- } else
- break;
- } /* for instance */
- } while (!done);
- main_running = 0;
+ done = 0;
+ } else
+ break;
+ } /* for instance */
+ } while (!done);
+ main_running = 0;
}
#ifndef DONT_USE_INTR
@@ -1286,489 +1388,481 @@
* Function : void NCR5380_intr (int irq)
*
* Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
- * from the disconnected queue, and restarting NCR5380_main()
- * as required.
+ * from the disconnected queue, and restarting NCR5380_main()
+ * as required.
*
* Inputs : int irq, irq that caused this interrupt.
*
*/
-static void NCR5380_intr (int irq, void *dev_id, struct pt_regs * regs) {
- NCR5380_local_declare();
- struct Scsi_Host *instance;
- int done;
- unsigned char basr;
+static void NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs) {
+ NCR5380_local_declare();
+ struct Scsi_Host *instance;
+ int done;
+ unsigned char basr;
+ unsigned long flags;
+
+ save_flags(flags);
+ cli();
#if (NDEBUG & NDEBUG_INTR)
- printk("scsi : NCR5380 irq %d triggered\n", irq);
+ printk("scsi : NCR5380 irq %d triggered\n", irq);
#endif
- do {
- done = 1;
- for (instance = first_instance; instance && (instance->hostt ==
- the_template); instance = instance->next)
- if (instance->irq == irq) {
-
- /* Look for pending interrupts */
- NCR5380_setup(instance);
- basr = NCR5380_read(BUS_AND_STATUS_REG);
- /* XXX dispatch to appropriate routine if found and done=0 */
- if (basr & BASR_IRQ) {
+ do {
+ done = 1;
+ for (instance = first_instance; instance && (instance->hostt ==
+ the_template); instance = instance->next)
+ if (instance->irq == irq) {
+
+ /* Look for pending interrupts */
+ NCR5380_setup(instance);
+ basr = NCR5380_read(BUS_AND_STATUS_REG);
+ /* XXX dispatch to appropriate routine if found and done=0 */
+ if (basr & BASR_IRQ) {
#if (NDEBUG & NDEBUG_INTR)
- NCR5380_print(instance);
+ NCR5380_print(instance);
#endif
- if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
- (SR_SEL | SR_IO)) {
- done = 0;
- sti();
+ if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
+ (SR_SEL | SR_IO)) {
+ done = 0;
+ restore_flags(flags);
#if (NDEBUG & NDEBUG_INTR)
- printk("scsi%d : SEL interrupt\n", instance->host_no);
+ printk("scsi%d : SEL interrupt\n", instance->host_no);
#endif
- NCR5380_reselect(instance);
- (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
- } else if (basr & BASR_PARITY_ERROR) {
+ NCR5380_reselect(instance);
+ (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ } else if (basr & BASR_PARITY_ERROR) {
#if (NDEBUG & NDEBUG_INTR)
- printk("scsi%d : PARITY interrupt\n", instance->host_no);
+ printk("scsi%d : PARITY interrupt\n", instance->host_no);
#endif
- (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
- } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
+ (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
#if (NDEBUG & NDEBUG_INTR)
- printk("scsi%d : RESET interrupt\n", instance->host_no);
+ printk("scsi%d : RESET interrupt\n", instance->host_no);
#endif
- (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
- } else {
+ (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ } else {
/*
* XXX the rest of the interrupt conditions should *only* occur during a
* DMA transfer, which I haven't gotten around to fixing yet.
*/
#if defined(REAL_DMA)
- /*
- * We should only get PHASE MISMATCH and EOP interrupts
- * if we have DMA enabled, so do a sanity check based on
- * the current setting of the MODE register.
- */
-
- if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr &
- BASR_END_DMA_TRANSFER) ||
- !(basr & BASR_PHASE_MATCH))) {
- int transfered;
-
- if (!hostdata->connected)
- panic("scsi%d : received end of DMA interrupt with no connected cmd\n",
- instance->hostno);
-
- transfered = (hostdata->dmalen - NCR5380_dma_residual(instance));
- hostdata->connected->SCp.this_residual -= transferred;
- hostdata->connected->SCp.ptr += transferred;
- hostdata->dmalen = 0;
+ /*
+ * We should only get PHASE MISMATCH and EOP interrupts
+ * if we have DMA enabled, so do a sanity check based on
+ * the current setting of the MODE register.
+ */
+
+ if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr &
+ BASR_END_DMA_TRANSFER) ||
+ !(basr & BASR_PHASE_MATCH))) {
+ int transfered;
+
+ if (!hostdata->connected)
+ panic("scsi%d : received end of DMA interrupt with no connected cmd\n",
+ instance->hostno);
+
+ transfered = (hostdata->dmalen - NCR5380_dma_residual(instance));
+ hostdata->connected->SCp.this_residual -= transferred;
+ hostdata->connected->SCp.ptr += transferred;
+ hostdata->dmalen = 0;
- (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
#if NCR_TIMEOUT
- {
- unsigned long timeout = jiffies + NCR_TIMEOUT;
+ {
+ unsigned long timeout = jiffies + NCR_TIMEOUT;
- while (NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK
- && jiffies < timeout)
- ;
- if (jiffies >= timeout)
- printk("scsi%d: timeout at NCR5380.c:%d\n",
- host->host_no, __LINE__);
- }
-#else /* NCR_TIMEOUT */
- while (NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK);
-#endif
-
- NCR5380_write(MODE_REG, MR_BASE);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- }
+ while (NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK
+ && jiffies < timeout);
+ if (jiffies >= timeout)
+ printk("scsi%d: timeout at NCR5380.c:%d\n",
+ host->host_no, __LINE__);
+ }
+#else /* NCR_TIMEOUT */
+ while (NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK);
+#endif
+
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ }
#else
#if (NDEBUG & NDEBUG_INTR)
- printk("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
+ printk("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
#endif
- (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG);
#endif
- }
- } /* if BASR_IRQ */
- if (!done)
- run_main();
- } /* if (instance->irq == irq) */
- } while (!done);
+ }
+ } /* if BASR_IRQ */
+ if (!done)
+ run_main();
+ } /* if (instance->irq == irq) */
+ } while (!done);
}
-static void do_NCR5380_intr (int irq, void *dev_id, struct pt_regs * regs) {
- unsigned long flags;
+static void do_NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs) {
+ unsigned long flags;
- spin_lock_irqsave(&io_request_lock, flags);
- NCR5380_intr(irq, dev_id, regs);
- spin_unlock_irqrestore(&io_request_lock, flags);
+ spin_lock_irqsave(&io_request_lock, flags);
+ NCR5380_intr(irq, dev_id, regs);
+ spin_unlock_irqrestore(&io_request_lock, flags);
}
#endif
#ifdef NCR5380_STATS
-static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd)
-{
-# ifdef NCR5380_STAT_LIMIT
- if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
-# endif
- switch (cmd->cmnd[0])
- {
- case WRITE:
- case WRITE_6:
- case WRITE_10:
- hostdata->time_write[cmd->target] += (jiffies - hostdata->timebase);
- /*hostdata->bytes_write[cmd->target] += cmd->request_bufflen;*/
- hostdata->pendingw--;
- break;
- case READ:
- case READ_6:
- case READ_10:
- hostdata->time_read[cmd->target] += (jiffies - hostdata->timebase);
- /*hostdata->bytes_read[cmd->target] += cmd->request_bufflen;*/
- hostdata->pendingr--;
- break;
- }
+static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) {
+#ifdef NCR5380_STAT_LIMIT
+ if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
+#endif
+ switch (cmd->cmnd[0]) {
+ case WRITE:
+ case WRITE_6:
+ case WRITE_10:
+ hostdata->time_write[cmd->target] += (jiffies - hostdata->timebase);
+ /*hostdata->bytes_write[cmd->target] += cmd->request_bufflen; */
+ hostdata->pendingw--;
+ break;
+ case READ:
+ case READ_6:
+ case READ_10:
+ hostdata->time_read[cmd->target] += (jiffies - hostdata->timebase);
+ /*hostdata->bytes_read[cmd->target] += cmd->request_bufflen; */
+ hostdata->pendingr--;
+ break;
+ }
}
#endif
-
/*
* Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
- * int tag);
+ * int tag);
*
* Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
- * including ARBITRATION, SELECTION, and initial message out for
- * IDENTIFY and queue messages.
+ * including ARBITRATION, SELECTION, and initial message out for
+ * IDENTIFY and queue messages.
*
* Inputs : instance - instantiation of the 5380 driver on which this
- * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
- * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
- * the command that is presently connected.
+ * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
+ * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
+ * the command that is presently connected.
*
* Returns : -1 if selection could not execute for some reason,
- * 0 if selection succeeded or failed because the target
- * did not respond.
+ * 0 if selection succeeded or failed because the target
+ * did not respond.
*
* Side effects :
- * If bus busy, arbitration failed, etc, NCR5380_select() will exit
- * with registers as they should have been on entry - ie
- * SELECT_ENABLE will be set appropriately, the NCR5380
- * will cease to drive any SCSI bus signals.
- *
- * If successful : I_T_L or I_T_L_Q nexus will be established,
- * instance->connected will be set to cmd.
- * SELECT interrupt will be disabled.
- *
- * If failed (no target) : cmd->scsi_done() will be called, and the
- * cmd->result host byte set to DID_BAD_TARGET.
- */
-
-static int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
- int tag) {
- NCR5380_local_declare();
- struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata*)
- instance->hostdata;
- unsigned char tmp[3], phase;
- unsigned char *data;
- int len;
- unsigned long timeout;
- NCR5380_setup(instance);
-
- hostdata->restart_select = 0;
-#if defined (NDEBUG) && (NDEBUG & NDEBUG_ARBITRATION)
- NCR5380_print(instance);
- printk("scsi%d : starting arbitration, id = %d\n", instance->host_no,
- instance->this_id);
-#endif
- cli();
-
- /*
- * Set the phase bits to 0, otherwise the NCR5380 won't drive the
- * data bus during SELECTION.
- */
-
- NCR5380_write(TARGET_COMMAND_REG, 0);
-
-
- /*
- * Start arbitration.
- */
-
- NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
- NCR5380_write(MODE_REG, MR_ARBITRATE);
+ * If bus busy, arbitration failed, etc, NCR5380_select() will exit
+ * with registers as they should have been on entry - ie
+ * SELECT_ENABLE will be set appropriately, the NCR5380
+ * will cease to drive any SCSI bus signals.
+ *
+ * If successful : I_T_L or I_T_L_Q nexus will be established,
+ * instance->connected will be set to cmd.
+ * SELECT interrupt will be disabled.
+ *
+ * If failed (no target) : cmd->scsi_done() will be called, and the
+ * cmd->result host byte set to DID_BAD_TARGET.
+ */
+static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) {
+ NCR5380_local_declare();
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata;
+ unsigned char tmp[3], phase;
+ unsigned char *data;
+ int len;
+ unsigned long timeout;
+ unsigned long flags;
+
+ NCR5380_setup(instance);
+
+ hostdata->restart_select = 0;
+#if defined (NDEBUG) && (NDEBUG & NDEBUG_ARBITRATION)
+ NCR5380_print(instance);
+ printk("scsi%d : starting arbitration, id = %d\n", instance->host_no,
+ instance->this_id);
+#endif
+ save_flags(flags);
+ cli();
+
+ /*
+ * Set the phase bits to 0, otherwise the NCR5380 won't drive the
+ * data bus during SELECTION.
+ */
+
+ NCR5380_write(TARGET_COMMAND_REG, 0);
- sti();
- /* Wait for arbitration logic to complete */
+ /*
+ * Start arbitration.
+ */
+
+ NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
+ NCR5380_write(MODE_REG, MR_ARBITRATE);
+
+ restore_flags(flags);
+
+ /* Wait for arbitration logic to complete */
#if NCR_TIMEOUT
- {
- unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
+ {
+ unsigned long timeout = jiffies + 2 * NCR_TIMEOUT;
- while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
- && jiffies < timeout)
- ;
- if (jiffies >= timeout)
- {
- printk("scsi: arbitration timeout at %d\n", __LINE__);
- NCR5380_write(MODE_REG, MR_BASE);
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- return -1;
- }
- }
-#else /* NCR_TIMEOUT */
- while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS));
+ while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS)
+ && jiffies < timeout);
+ if (jiffies >= timeout) {
+ printk("scsi: arbitration timeout at %d\n", __LINE__);
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ return -1;
+ }
+ }
+#else /* NCR_TIMEOUT */
+ while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS));
#endif
-#if (NDEBUG & NDEBUG_ARBITRATION)
- printk("scsi%d : arbitration complete\n", instance->host_no);
+#if (NDEBUG & NDEBUG_ARBITRATION)
+ printk("scsi%d : arbitration complete\n", instance->host_no);
/* Avoid GCC 2.4.5 asm needs to many reloads error */
- __asm__("nop");
+ __asm__("nop");
#endif
- /*
- * The arbitration delay is 2.2us, but this is a minimum and there is
- * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
- * the integral nature of udelay().
- *
- */
-
- udelay(3);
-
- /* Check for lost arbitration */
- if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
- (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
- (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
- NCR5380_write(MODE_REG, MR_BASE);
+ /*
+ * The arbitration delay is 2.2us, but this is a minimum and there is
+ * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
+ * the integral nature of udelay().
+ *
+ */
+
+ udelay(3);
+
+ /* Check for lost arbitration */
+ if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
+ (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
+ (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
+ NCR5380_write(MODE_REG, MR_BASE);
#if (NDEBUG & NDEBUG_ARBITRATION)
- printk("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n",
- instance->host_no);
+ printk("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n",
+ instance->host_no);
#endif
- return -1;
- }
+ return -1;
+ }
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
+ if (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) {
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+#if (NDEBUG & NDEBUG_ARBITRATION)
+ printk("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n",
+ instance->host_no);
+#endif
+ return -1;
+ }
+ /*
+ * Again, bus clear + bus settle time is 1.2us, however, this is
+ * a minimum so we'll udelay ceil(1.2)
+ */
+ udelay(2);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL);
-
- if (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) {
- NCR5380_write(MODE_REG, MR_BASE);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
#if (NDEBUG & NDEBUG_ARBITRATION)
- printk("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n",
- instance->host_no);
+ printk("scsi%d : won arbitration\n", instance->host_no);
#endif
- return -1;
- }
- /*
- * Again, bus clear + bus settle time is 1.2us, however, this is
- * a minimum so we'll udelay ceil(1.2)
- */
- udelay(2);
+ /*
+ * Now that we have won arbitration, start Selection process, asserting
+ * the host and target ID's on the SCSI bus.
+ */
-#if (NDEBUG & NDEBUG_ARBITRATION)
- printk("scsi%d : won arbitration\n", instance->host_no);
-#endif
+ NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->target)));
+
+ /*
+ * Raise ATN while SEL is true before BSY goes false from arbitration,
+ * since this is the only way to guarantee that we'll get a MESSAGE OUT
+ * phase immediately after selection.
+ */
+
+ NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
+ ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL));
+ NCR5380_write(MODE_REG, MR_BASE);
+
+ /*
+ * Reselect interrupts must be turned off prior to the dropping of BSY,
+ * otherwise we will trigger an interrupt.
+ */
+ NCR5380_write(SELECT_ENABLE_REG, 0);
+ /*
+ * The initiator shall then wait at least two deskew delays and release
+ * the BSY signal.
+ */
+ udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
- /*
- * Now that we have won arbitration, start Selection process, asserting
- * the host and target ID's on the SCSI bus.
- */
-
- NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->target)));
-
- /*
- * Raise ATN while SEL is true before BSY goes false from arbitration,
- * since this is the only way to guarantee that we'll get a MESSAGE OUT
- * phase immediately after selection.
- */
-
- NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
- ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
- NCR5380_write(MODE_REG, MR_BASE);
-
- /*
- * Reselect interrupts must be turned off prior to the dropping of BSY,
- * otherwise we will trigger an interrupt.
- */
- NCR5380_write(SELECT_ENABLE_REG, 0);
-
- /*
- * The initiator shall then wait at least two deskew delays and release
- * the BSY signal.
- */
- udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
-
- /* Reset BSY */
- NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
- ICR_ASSERT_ATN | ICR_ASSERT_SEL));
-
- /*
- * Something weird happens when we cease to drive BSY - looks
- * like the board/chip is letting us do another read before the
- * appropriate propagation delay has expired, and we're confusing
- * a BSY signal from ourselves as the target's response to SELECTION.
- *
- * A small delay (the 'C++' frontend breaks the pipeline with an
- * unnecessary jump, making it work on my 386-33/Trantor T128, the
- * tighter 'C' code breaks and requires this) solves the problem -
- * the 1 us delay is arbitrary, and only used because this delay will
- * be the same on other platforms and since it works here, it should
- * work there.
- *
- * wingel suggests that this could be due to failing to wait
- * one deskew delay.
- */
+ /* Reset BSY */
+ NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
+ ICR_ASSERT_ATN | ICR_ASSERT_SEL));
- udelay(1);
+ /*
+ * Something weird happens when we cease to drive BSY - looks
+ * like the board/chip is letting us do another read before the
+ * appropriate propagation delay has expired, and we're confusing
+ * a BSY signal from ourselves as the target's response to SELECTION.
+ *
+ * A small delay (the 'C++' frontend breaks the pipeline with an
+ * unnecessary jump, making it work on my 386-33/Trantor T128, the
+ * tighter 'C' code breaks and requires this) solves the problem -
+ * the 1 us delay is arbitrary, and only used because this delay will
+ * be the same on other platforms and since it works here, it should
+ * work there.
+ *
+ * wingel suggests that this could be due to failing to wait
+ * one deskew delay.
+ */
+
+ udelay(1);
#if (NDEBUG & NDEBUG_SELECTION)
- printk("scsi%d : selecting target %d\n", instance->host_no, cmd->target);
+ printk("scsi%d : selecting target %d\n", instance->host_no, cmd->target);
#endif
- /*
- * The SCSI specification calls for a 250 ms timeout for the actual
- * selection.
- */
+ /*
+ * The SCSI specification calls for a 250 ms timeout for the actual
+ * selection.
+ */
- timeout = jiffies + (250*HZ/1000);
+ timeout = jiffies + (250 * HZ / 1000);
- /*
- * XXX very interesting - we're seeing a bounce where the BSY we
- * asserted is being reflected / still asserted (propagation delay?)
- * and it's detecting as true. Sigh.
- */
+ /*
+ * XXX very interesting - we're seeing a bounce where the BSY we
+ * asserted is being reflected / still asserted (propagation delay?)
+ * and it's detecting as true. Sigh.
+ */
- while ((jiffies < timeout) && !(NCR5380_read(STATUS_REG) &
- (SR_BSY | SR_IO)));
+ while ((jiffies < timeout) && !(NCR5380_read(STATUS_REG) &
+ (SR_BSY | SR_IO)));
- if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
+ if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) ==
(SR_SEL | SR_IO)) {
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- NCR5380_reselect(instance);
- printk ("scsi%d : reselection after won arbitration?\n",
- instance->host_no);
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- return -1;
- }
-
- /*
- * No less than two deskew delays after the initiator detects the
- * BSY signal is true, it shall release the SEL signal and may
- * change the DATA BUS. -wingel
- */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ NCR5380_reselect(instance);
+ printk("scsi%d : reselection after won arbitration?\n",
+ instance->host_no);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ return -1;
+ }
+ /*
+ * No less than two deskew delays after the initiator detects the
+ * BSY signal is true, it shall release the SEL signal and may
+ * change the DATA BUS. -wingel
+ */
- udelay(1);
+ udelay(1);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
- if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- if (hostdata->targets_present & (1 << cmd->target)) {
- printk("scsi%d : weirdness\n", instance->host_no);
- if (hostdata->restart_select)
- printk("\trestart select\n");
+ if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ if (hostdata->targets_present & (1 << cmd->target)) {
+ printk("scsi%d : weirdness\n", instance->host_no);
+ if (hostdata->restart_select)
+ printk("\trestart select\n");
#ifdef NDEBUG
- NCR5380_print (instance);
+ NCR5380_print(instance);
#endif
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- return -1;
- }
- cmd->result = DID_BAD_TARGET << 16;
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ return -1;
+ }
+ cmd->result = DID_BAD_TARGET << 16;
#ifdef NCR5380_STATS
- collect_stats(hostdata, cmd);
+ collect_stats(hostdata, cmd);
#endif
- cmd->scsi_done(cmd);
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ cmd->scsi_done(cmd);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
#if (NDEBUG & NDEBUG_SELECTION)
- printk("scsi%d : target did not respond within 250ms\n",
- instance->host_no);
+ printk("scsi%d : target did not respond within 250ms\n",
+ instance->host_no);
#endif
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- return 0;
- }
-
- hostdata->targets_present |= (1 << cmd->target);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ return 0;
+ }
+ hostdata->targets_present |= (1 << cmd->target);
- /*
- * Since we followed the SCSI spec, and raised ATN while SEL
- * was true but before BSY was false during selection, the information
- * transfer phase should be a MESSAGE OUT phase so that we can send the
- * IDENTIFY message.
- *
- * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
- * message (2 bytes) with a tag ID that we increment with every command
- * until it wraps back to 0.
- *
- * XXX - it turns out that there are some broken SCSI-II devices,
- * which claim to support tagged queuing but fail when more than
- * some number of commands are issued at once.
- */
+ /*
+ * Since we followed the SCSI spec, and raised ATN while SEL
+ * was true but before BSY was false during selection, the information
+ * transfer phase should be a MESSAGE OUT phase so that we can send the
+ * IDENTIFY message.
+ *
+ * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
+ * message (2 bytes) with a tag ID that we increment with every command
+ * until it wraps back to 0.
+ *
+ * XXX - it turns out that there are some broken SCSI-II devices,
+ * which claim to support tagged queuing but fail when more than
+ * some number of commands are issued at once.
+ */
- /* Wait for start of REQ/ACK handshake */
+ /* Wait for start of REQ/ACK handshake */
#ifdef NCR_TIMEOUT
- {
- unsigned long timeout = jiffies + NCR_TIMEOUT;
-
- while (!(NCR5380_read(STATUS_REG) & SR_REQ) && jiffies < timeout);
-
- if (jiffies >= timeout) {
- printk("scsi%d: timeout at NCR5380.c:%d\n", __LINE__);
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- return -1;
- }
- }
-#else /* NCR_TIMEOUT */
- while (!(NCR5380_read(STATUS_REG) & SR_REQ));
-#endif /* def NCR_TIMEOUT */
+ {
+ unsigned long timeout = jiffies + NCR_TIMEOUT;
+
+ while (!(NCR5380_read(STATUS_REG) & SR_REQ) && jiffies < timeout);
+
+ if (jiffies >= timeout) {
+ printk("scsi%d: timeout at NCR5380.c:%d\n", __LINE__);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ return -1;
+ }
+ }
+#else /* NCR_TIMEOUT */
+ while (!(NCR5380_read(STATUS_REG) & SR_REQ));
+#endif /* def NCR_TIMEOUT */
#if (NDEBUG & NDEBUG_SELECTION)
- printk("scsi%d : target %d selected, going into MESSAGE OUT phase.\n",
- instance->host_no, cmd->target);
+ printk("scsi%d : target %d selected, going into MESSAGE OUT phase.\n",
+ instance->host_no, cmd->target);
#endif
- tmp[0] = IDENTIFY(((instance->irq == IRQ_NONE) ? 0 : 1), cmd->lun);
+ tmp[0] = IDENTIFY(((instance->irq == IRQ_NONE) ? 0 : 1), cmd->lun);
#ifdef SCSI2
- if (cmd->device->tagged_queue && (tag != TAG_NONE)) {
- tmp[1] = SIMPLE_QUEUE_TAG;
- if (tag == TAG_NEXT) {
- /* 0 is TAG_NONE, used to imply no tag for this command */
- if (cmd->device->current_tag == 0)
- cmd->device->current_tag = 1;
-
- cmd->tag = cmd->device->current_tag;
- cmd->device->current_tag++;
- } else
- cmd->tag = (unsigned char) tag;
-
- tmp[2] = cmd->tag;
- hostdata->last_message = SIMPLE_QUEUE_TAG;
- len = 3;
- } else
-#endif /* def SCSI2 */
- {
- len = 1;
- cmd->tag=0;
- }
+ if (cmd->device->tagged_queue && (tag != TAG_NONE)) {
+ tmp[1] = SIMPLE_QUEUE_TAG;
+ if (tag == TAG_NEXT) {
+ /* 0 is TAG_NONE, used to imply no tag for this command */
+ if (cmd->device->current_tag == 0)
+ cmd->device->current_tag = 1;
+
+ cmd->tag = cmd->device->current_tag;
+ cmd->device->current_tag++;
+ } else
+ cmd->tag = (unsigned char) tag;
- /* Send message(s) */
- data = tmp;
- phase = PHASE_MSGOUT;
- NCR5380_transfer_pio(instance, &phase, &len, &data);
+ tmp[2] = cmd->tag;
+ hostdata->last_message = SIMPLE_QUEUE_TAG;
+ len = 3;
+ } else
+#endif /* def SCSI2 */
+ {
+ len = 1;
+ cmd->tag = 0;
+ }
+
+ /* Send message(s) */
+ data = tmp;
+ phase = PHASE_MSGOUT;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
#if (NDEBUG & NDEBUG_SELECTION)
- printk("scsi%d : nexus established.\n", instance->host_no);
+ printk("scsi%d : nexus established.\n", instance->host_no);
#endif
- /* XXX need to handle errors here */
- hostdata->connected = cmd;
+ /* XXX need to handle errors here */
+ hostdata->connected = cmd;
#ifdef SCSI2
- if (!cmd->device->tagged_queue)
-#endif
- hostdata->busy[cmd->target] |= (1 << cmd->lun);
+ if (!cmd->device->tagged_queue)
+#endif
+ hostdata->busy[cmd->target] |= (1 << cmd->lun);
- initialize_SCp(cmd);
+ initialize_SCp(cmd);
- return 0;
+ return 0;
}
/*
@@ -1778,14 +1872,14 @@
* Purpose : transfers data in given phase using polled I/O
*
* Inputs : instance - instance of driver, *phase - pointer to
- * what phase is expected, *count - pointer to number of
- * bytes to transfer, **data - pointer to data pointer.
+ * what phase is expected, *count - pointer to number of
+ * bytes to transfer, **data - pointer to data pointer.
*
* Returns : -1 when different phase is entered without transferring
- * maximum number of bytes, 0 if all bytes or transfered or exit
- * is in same phase.
+ * maximum number of bytes, 0 if all bytes or transfered or exit
+ * is in same phase.
*
- * Also, *phase, *count, *data are modified in place.
+ * Also, *phase, *count, *data are modified in place.
*
* XXX Note : handling for bus free may be useful.
*/
@@ -1796,197 +1890,193 @@
* counts, we will always do a pseudo DMA or DMA transfer.
*/
-static int NCR5380_transfer_pio (struct Scsi_Host *instance,
- unsigned char *phase, int *count, unsigned char **data) {
- NCR5380_local_declare();
- register unsigned char p = *phase, tmp;
- register int c = *count;
- register unsigned char *d = *data;
- NCR5380_setup(instance);
+static int NCR5380_transfer_pio(struct Scsi_Host *instance,
+ unsigned char *phase, int *count, unsigned char **data) {
+ NCR5380_local_declare();
+ register unsigned char p = *phase, tmp;
+ register int c = *count;
+ register unsigned char *d = *data;
+ NCR5380_setup(instance);
#if (NDEBUG & NDEBUG_PIO)
- if (!(p & SR_IO))
- printk("scsi%d : pio write %d bytes\n", instance->host_no, c);
- else
- printk("scsi%d : pio read %d bytes\n", instance->host_no, c);
+ if (!(p & SR_IO))
+ printk("scsi%d : pio write %d bytes\n", instance->host_no, c);
+ else
+ printk("scsi%d : pio read %d bytes\n", instance->host_no, c);
#endif
- /*
- * The NCR5380 chip will only drive the SCSI bus when the
- * phase specified in the appropriate bits of the TARGET COMMAND
- * REGISTER match the STATUS REGISTER
- */
-
- NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
-
- do {
/*
- * Wait for assertion of REQ, after which the phase bits will be
- * valid
+ * The NCR5380 chip will only drive the SCSI bus when the
+ * phase specified in the appropriate bits of the TARGET COMMAND
+ * REGISTER match the STATUS REGISTER
*/
- while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
+
+ NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
+
+ do {
+ /*
+ * Wait for assertion of REQ, after which the phase bits will be
+ * valid
+ */
+ while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ));
#if (NDEBUG & NDEBUG_HANDSHAKE)
- printk("scsi%d : REQ detected\n", instance->host_no);
+ printk("scsi%d : REQ detected\n", instance->host_no);
#endif
- /* Check for phase mismatch */
- if ((tmp & PHASE_MASK) != p) {
+ /* Check for phase mismatch */
+ if ((tmp & PHASE_MASK) != p) {
#if (NDEBUG & NDEBUG_PIO)
- printk("scsi%d : phase mismatch\n", instance->host_no);
- NCR5380_print_phase(instance);
+ printk("scsi%d : phase mismatch\n", instance->host_no);
+ NCR5380_print_phase(instance);
#endif
- break;
- }
-
- /* Do actual transfer from SCSI bus to / from memory */
- if (!(p & SR_IO))
- NCR5380_write(OUTPUT_DATA_REG, *d);
- else
- *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
+ break;
+ }
+ /* Do actual transfer from SCSI bus to / from memory */ if (!(p & SR_IO))
+ NCR5380_write(OUTPUT_DATA_REG, *d);
+ else
+ *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
- ++d;
+ ++d;
- /*
- * The SCSI standard suggests that in MSGOUT phase, the initiator
- * should drop ATN on the last byte of the message phase
- * after REQ has been asserted for the handshake but before
- * the initiator raises ACK.
- */
+ /*
+ * The SCSI standard suggests that in MSGOUT phase, the initiator
+ * should drop ATN on the last byte of the message phase
+ * after REQ has been asserted for the handshake but before
+ * the initiator raises ACK.
+ */
- if (!(p & SR_IO)) {
- if (!((p & SR_MSG) && c > 1)) {
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
- ICR_ASSERT_DATA);
+ if (!(p & SR_IO)) {
+ if (!((p & SR_MSG) && c > 1)) {
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
+ ICR_ASSERT_DATA);
#if (NDEBUG & NDEBUG_PIO)
- NCR5380_print(instance);
+ NCR5380_print(instance);
#endif
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
- ICR_ASSERT_DATA | ICR_ASSERT_ACK);
- } else {
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
- ICR_ASSERT_DATA | ICR_ASSERT_ATN);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
+ ICR_ASSERT_DATA | ICR_ASSERT_ACK);
+ } else {
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
+ ICR_ASSERT_DATA | ICR_ASSERT_ATN);
#if (NDEBUG & NDEBUG_PIO)
- NCR5380_print(instance);
+ NCR5380_print(instance);
#endif
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
- ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
- }
- } else {
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
+ ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
+ }
+ } else {
#if (NDEBUG & NDEBUG_PIO)
- NCR5380_print(instance);
+ NCR5380_print(instance);
#endif
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
- }
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
+ }
- while (NCR5380_read(STATUS_REG) & SR_REQ);
+ while (NCR5380_read(STATUS_REG) & SR_REQ);
#if (NDEBUG & NDEBUG_HANDSHAKE)
- printk("scsi%d : req false, handshake complete\n", instance->host_no);
+ printk("scsi%d : req false, handshake complete\n", instance->host_no);
#endif
/*
* We have several special cases to consider during REQ/ACK handshaking :
* 1. We were in MSGOUT phase, and we are on the last byte of the
- * message. ATN must be dropped as ACK is dropped.
+ * message. ATN must be dropped as ACK is dropped.
*
* 2. We are in a MSGIN phase, and we are on the last byte of the
- * message. We must exit with ACK asserted, so that the calling
- * code may raise ATN before dropping ACK to reject the message.
+ * message. We must exit with ACK asserted, so that the calling
+ * code may raise ATN before dropping ACK to reject the message.
*
* 3. ACK and ATN are clear and the target may proceed as normal.
*/
- if (!(p == PHASE_MSGIN && c == 1)) {
- if (p == PHASE_MSGOUT && c > 1)
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
- else
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- }
- } while (--c);
+ if (!(p == PHASE_MSGIN && c == 1)) {
+ if (p == PHASE_MSGOUT && c > 1)
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+ else
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ }
+ } while (--c);
-#if (NDEBUG & NDEBUG_PIO)
- printk("scsi%d : residual %d\n", instance->host_no, c);
+#if (NDEBUG & NDEBUG_PIO)
+ printk("scsi%d : residual %d\n", instance->host_no, c);
#endif
- *count = c;
- *data = d;
- tmp = NCR5380_read(STATUS_REG);
- if (tmp & SR_REQ)
- *phase = tmp & PHASE_MASK;
- else
- *phase = PHASE_UNKNOWN;
+ *count = c;
+ *data = d;
+ tmp = NCR5380_read(STATUS_REG);
+ if (tmp & SR_REQ)
+ *phase = tmp & PHASE_MASK;
+ else
+ *phase = PHASE_UNKNOWN;
+
+ if (!c || (*phase == p))
+ return 0;
+ else
+ return -1;
+}
+
+static void do_reset(struct Scsi_Host *host) {
+ unsigned long flags;
+ NCR5380_local_declare();
+ NCR5380_setup(host);
+
+ save_flags(flags);
+ cli();
+ NCR5380_write(TARGET_COMMAND_REG,
+ PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
+ udelay(25);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ restore_flags(flags);
+} /*
+
+ * Function : do_abort (Scsi_Host *host)
+ *
+ * Purpose : abort the currently established nexus. Should only be
+ * called from a routine which can drop into a
+ *
+ * Returns : 0 on success, -1 on failure.
+ */ static int do_abort(struct Scsi_Host *host) {
+ NCR5380_local_declare();
+ unsigned char tmp, *msgptr, phase;
+ int len;
+ NCR5380_setup(host);
- if (!c || (*phase == p))
- return 0;
- else
- return -1;
-}
-static void do_reset (struct Scsi_Host *host) {
- NCR5380_local_declare();
- NCR5380_setup(host);
+ /* Request message out phase */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
- cli();
- NCR5380_write(TARGET_COMMAND_REG,
- PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
- udelay(25);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- sti();
-}
+ /*
+ * Wait for the target to indicate a valid phase by asserting
+ * REQ. Once this happens, we'll have either a MSGOUT phase
+ * and can immediately send the ABORT message, or we'll have some
+ * other phase and will have to source/sink data.
+ *
+ * We really don't care what value was on the bus or what value
+ * the target sees, so we just handshake.
+ */
-/*
- * Function : do_abort (Scsi_Host *host)
- *
- * Purpose : abort the currently established nexus. Should only be
- * called from a routine which can drop into a
- *
- * Returns : 0 on success, -1 on failure.
- */
+ while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ);
-static int do_abort (struct Scsi_Host *host) {
- NCR5380_local_declare();
- unsigned char tmp, *msgptr, phase;
- int len;
- NCR5380_setup(host);
-
-
- /* Request message out phase */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
-
- /*
- * Wait for the target to indicate a valid phase by asserting
- * REQ. Once this happens, we'll have either a MSGOUT phase
- * and can immediately send the ABORT message, or we'll have some
- * other phase and will have to source/sink data.
- *
- * We really don't care what value was on the bus or what value
- * the target sees, so we just handshake.
- */
-
- while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ);
-
- NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
-
- if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
- ICR_ASSERT_ACK);
- while (NCR5380_read(STATUS_REG) & SR_REQ);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
- }
-
- tmp = ABORT;
- msgptr = &tmp;
- len = 1;
- phase = PHASE_MSGOUT;
- NCR5380_transfer_pio (host, &phase, &len, &msgptr);
-
- /*
- * If we got here, and the command completed successfully,
- * we're about to go into bus free state.
- */
+ NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
+
+ if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
+ ICR_ASSERT_ACK);
+ while (NCR5380_read(STATUS_REG) & SR_REQ);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
+ }
+ tmp = ABORT;
+ msgptr = &tmp;
+ len = 1;
+ phase = PHASE_MSGOUT;
+ NCR5380_transfer_pio(host, &phase, &len, &msgptr);
+
+ /*
+ * If we got here, and the command completed successfully,
+ * we're about to go into bus free state.
+ */
- return len ? -1 : 0;
+ return len ? -1 : 0;
}
#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
@@ -1995,86 +2085,86 @@
* unsigned char *phase, int *count, unsigned char **data)
*
* Purpose : transfers data in given phase using either real
- * or pseudo DMA.
+ * or pseudo DMA.
*
* Inputs : instance - instance of driver, *phase - pointer to
- * what phase is expected, *count - pointer to number of
- * bytes to transfer, **data - pointer to data pointer.
+ * what phase is expected, *count - pointer to number of
+ * bytes to transfer, **data - pointer to data pointer.
*
* Returns : -1 when different phase is entered without transferring
- * maximum number of bytes, 0 if all bytes or transfered or exit
- * is in same phase.
+ * maximum number of bytes, 0 if all bytes or transfered or exit
+ * is in same phase.
*
- * Also, *phase, *count, *data are modified in place.
+ * Also, *phase, *count, *data are modified in place.
*
*/
-static int NCR5380_transfer_dma (struct Scsi_Host *instance,
- unsigned char *phase, int *count, unsigned char **data) {
- NCR5380_local_declare();
- register int c = *count;
- register unsigned char p = *phase;
- register unsigned char *d = *data;
- unsigned char tmp;
- int foo;
+static int NCR5380_transfer_dma(struct Scsi_Host *instance,
+ unsigned char *phase, int *count, unsigned char **data) {
+ NCR5380_local_declare();
+ register int c = *count;
+ register unsigned char p = *phase;
+ register unsigned char *d = *data;
+ unsigned char tmp;
+ int foo;
+ unsigned long flags;
#if defined(REAL_DMA_POLL)
- int cnt, toPIO;
- unsigned char saved_data = 0, overrun = 0, residue;
+ int cnt, toPIO;
+ unsigned char saved_data = 0, overrun = 0, residue;
#endif
- struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
- instance->hostdata;
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
+ instance->hostdata;
- NCR5380_setup(instance);
+ NCR5380_setup(instance);
- if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
- *phase = tmp;
- return -1;
- }
-#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
-#ifdef READ_OVERRUNS
- if (p & SR_IO) {
- c -= 2;
- }
+ if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
+ *phase = tmp;
+ return -1;
+ }
+#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
+#ifdef READ_OVERRUNS if (p & SR_IO) { c -= 2;
+}
#endif
#if (NDEBUG & NDEBUG_DMA)
- printk("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n",
- instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" :
- "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d);
+printk("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n",
+ instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" :
+ "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d);
#endif
- hostdata->dma_len = (p & SR_IO) ?
- NCR5380_dma_read_setup(instance, d, c) :
- NCR5380_dma_write_setup(instance, d, c);
+hostdata->dma_len = (p & SR_IO) ?
+NCR5380_dma_read_setup(instance, d, c) :
+NCR5380_dma_write_setup(instance, d, c);
#endif
- NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
+NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
#ifdef REAL_DMA
- NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
+NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
#elif defined(REAL_DMA_POLL)
- NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
+NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
#else
- /*
- * Note : on my sample board, watch-dog timeouts occurred when interrupts
- * were not disabled for the duration of a single DMA transfer, from
- * before the setting of DMA mode to after transfer of the last byte.
- */
+ /*
+ * Note : on my sample board, watch-dog timeouts occurred when interrupts
+ * were not disabled for the duration of a single DMA transfer, from
+ * before the setting of DMA mode to after transfer of the last byte.
+ */
#if defined(PSEUDO_DMA) && !defined(UNSAFE)
- cli();
+save_flags(flags);
+cli();
#endif
- /* KLL May need eop and parity in 53c400 */
- if (hostdata->flags & FLAG_NCR53C400)
+ /* KLL May need eop and parity in 53c400 */
+if (hostdata->flags & FLAG_NCR53C400)
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK
- | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE
- | MR_MONITOR_BSY);
- else
+ | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE
+ | MR_MONITOR_BSY);
+else
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE);
-#endif /* def REAL_DMA */
+#endif /* def REAL_DMA */
#if (NDEBUG & NDEBUG_DMA) & 0
- printk("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG));
+printk("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG));
#endif
/*
@@ -2086,12 +2176,13 @@
* is the problem?
*/
- if (p & SR_IO) {
+if (p & SR_IO)
+{
#ifndef FOO
- udelay(1);
+udelay(1);
#endif
- NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
- } else {
+NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
+} else {
#ifndef FOO
udelay(1);
#endif
@@ -2103,86 +2194,90 @@
#ifndef FOO
udelay(1);
#endif
- }
+}
#if defined(REAL_DMA_POLL)
- do {
+do {
tmp = NCR5380_read(BUS_AND_STATUS_REG);
- } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR |
- BASR_END_DMA_TRANSFER)));
+} while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR |
+
+ BASR_END_DMA_TRANSFER)));
/*
- At this point, either we've completed DMA, or we have a phase mismatch,
- or we've unexpectedly lost BUSY (which is a real error).
+ At this point, either we've completed DMA, or we have a phase mismatch,
+ or we've unexpectedly lost BUSY (which is a real error).
- For write DMAs, we want to wait until the last byte has been
- transferred out over the bus before we turn off DMA mode. Alas, there
- seems to be no terribly good way of doing this on a 5380 under all
- conditions. For non-scatter-gather operations, we can wait until REQ
- and ACK both go false, or until a phase mismatch occurs. Gather-writes
- are nastier, since the device will be expecting more data than we
- are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
- could test LAST BIT SENT to assure transfer (I imagine this is precisely
- why this signal was added to the newer chips) but on the older 538[01]
- this signal does not exist. The workaround for this lack is a watchdog;
- we bail out of the wait-loop after a modest amount of wait-time if
- the usual exit conditions are not met. Not a terribly clean or
- correct solution :-%
-
- Reads are equally tricky due to a nasty characteristic of the NCR5380.
- If the chip is in DMA mode for an READ, it will respond to a target's
- REQ by latching the SCSI data into the INPUT DATA register and asserting
- ACK, even if it has _already_ been notified by the DMA controller that
- the current DMA transfer has completed! If the NCR5380 is then taken
- out of DMA mode, this already-acknowledged byte is lost.
-
- This is not a problem for "one DMA transfer per command" reads, because
- the situation will never arise... either all of the data is DMA'ed
- properly, or the target switches to MESSAGE IN phase to signal a
- disconnection (either operation bringing the DMA to a clean halt).
- However, in order to handle scatter-reads, we must work around the
- problem. The chosen fix is to DMA N-2 bytes, then check for the
- condition before taking the NCR5380 out of DMA mode. One or two extra
- bytes are transferred via PIO as necessary to fill out the original
- request.
-*/
+ For write DMAs, we want to wait until the last byte has been
+ transferred out over the bus before we turn off DMA mode. Alas, there
+ seems to be no terribly good way of doing this on a 5380 under all
+ conditions. For non-scatter-gather operations, we can wait until REQ
+ and ACK both go false, or until a phase mismatch occurs. Gather-writes
+ are nastier, since the device will be expecting more data than we
+ are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
+ could test LAST BIT SENT to assure transfer (I imagine this is precisely
+ why this signal was added to the newer chips) but on the older 538[01]
+ this signal does not exist. The workaround for this lack is a watchdog;
+ we bail out of the wait-loop after a modest amount of wait-time if
+ the usual exit conditions are not met. Not a terribly clean or
+ correct solution :-%
+
+ Reads are equally tricky due to a nasty characteristic of the NCR5380.
+ If the chip is in DMA mode for an READ, it will respond to a target's
+ REQ by latching the SCSI data into the INPUT DATA register and asserting
+ ACK, even if it has _already_ been notified by the DMA controller that
+ the current DMA transfer has completed! If the NCR5380 is then taken
+ out of DMA mode, this already-acknowledged byte is lost.
+
+ This is not a problem for "one DMA transfer per command" reads, because
+ the situation will never arise... either all of the data is DMA'ed
+ properly, or the target switches to MESSAGE IN phase to signal a
+ disconnection (either operation bringing the DMA to a clean halt).
+ However, in order to handle scatter-reads, we must work around the
+ problem. The chosen fix is to DMA N-2 bytes, then check for the
+ condition before taking the NCR5380 out of DMA mode. One or two extra
+ bytes are transferred via PIO as necessary to fill out the original
+ request.
+ */
- if (p & SR_IO) {
+if (p & SR_IO) {
#ifdef READ_OVERRUNS
- udelay(10);
- if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH|BASR_ACK)) ==
- (BASR_PHASE_MATCH | BASR_ACK))) {
- saved_data = NCR5380_read(INPUT_DATA_REGISTER);
- overrun = 1;
- }
-#endif
- } else {
- int limit = 100;
- while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) ||
- (NCR5380_read(STATUS_REG) & SR_REQ)) {
- if (!(tmp & BASR_PHASE_MATCH)) break;
- if (--limit < 0) break;
- }
- }
+ udelay(10);
+ if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) ==
+ (BASR_PHASE_MATCH | BASR_ACK))) {
+ saved_data = NCR5380_read(INPUT_DATA_REGISTER);
+ overrun = 1;
+ }
+#endif
+} else {
+ int limit = 100;
+ while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) ||
+ (NCR5380_read(STATUS_REG) & SR_REQ)) {
+ if (!(tmp & BASR_PHASE_MATCH))
+ break;
+ if (--limit < 0)
+ break;
+ }
+}
#if (NDEBUG & NDEBUG_DMA)
- printk("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n",
- instance->host_no, tmp, NCR5380_read(STATUS_REG));
+printk("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n",
+ instance->host_no, tmp, NCR5380_read(STATUS_REG));
#endif
- NCR5380_write(MODE_REG, MR_BASE);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+NCR5380_write(MODE_REG, MR_BASE);
+NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- residue = NCR5380_dma_residual(instance);
- c -= residue;
- *count -= c;
- *data += c;
- *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
+residue = NCR5380_dma_residual(instance);
+c -= residue;
+*count -= c;
+*data += c;
+*phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
#ifdef READ_OVERRUNS
- if (*phase == p && (p & SR_IO) && residue == 0) {
- if (overrun) {
+if (*phase == p && (p & SR_IO) && residue == 0)
+{
+if (overrun) {
#if (NDEBUG & NDEBUG_DMA)
printk("Got an input overrun, using saved byte\n");
#endif
@@ -2190,849 +2285,846 @@
*data += 1;
*count -= 1;
cnt = toPIO = 1;
- } else {
+} else {
printk("No overrun??\n");
cnt = toPIO = 2;
- }
+}
#if (NDEBUG & NDEBUG_DMA)
- printk("Doing %d-byte PIO to 0x%X\n", cnt, *data);
+printk("Doing %d-byte PIO to 0x%X\n", cnt, *data);
+#endif
+NCR5380_transfer_pio(instance, phase, &cnt, data);
+*count -= toPIO - cnt;
+}
#endif
- NCR5380_transfer_pio(instance, phase, &cnt, data);
- *count -= toPIO - cnt;
- }
-#endif
#if (NDEBUG & NDEBUG_DMA)
- printk("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n",
- *data, *count, *(*data+*count-1), *(*data+*count));
+printk("Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n",
+ *data, *count, *(*data + *count - 1), *(*data + *count));
#endif
- return 0;
-
+return 0;
+
#elif defined(REAL_DMA)
- return 0;
-#else /* defined(REAL_DMA_POLL) */
- if (p & SR_IO) {
+return 0;
+#else /* defined(REAL_DMA_POLL) */
+if (p & SR_IO) {
#ifdef DMA_WORKS_RIGHT
- foo = NCR5380_pread(instance, d, c);
+ foo = NCR5380_pread(instance, d, c);
#else
int diff = 1;
if (hostdata->flags & FLAG_NCR53C400) {
- diff=0;
+ diff = 0;
}
-
if (!(foo = NCR5380_pread(instance, d, c - diff))) {
- /*
- * We can't disable DMA mode after successfully transferring
- * what we plan to be the last byte, since that would open up
- * a race condition where if the target asserted REQ before
- * we got the DMA mode reset, the NCR5380 would have latched
- * an additional byte into the INPUT DATA register and we'd
- * have dropped it.
- *
- * The workaround was to transfer one fewer bytes than we
- * intended to with the pseudo-DMA read function, wait for
- * the chip to latch the last byte, read it, and then disable
- * pseudo-DMA mode.
- *
- * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
- * REQ is deasserted when ACK is asserted, and not reasserted
- * until ACK goes false. Since the NCR5380 won't lower ACK
- * until DACK is asserted, which won't happen unless we twiddle
- * the DMA port or we take the NCR5380 out of DMA mode, we
- * can guarantee that we won't handshake another extra
- * byte.
- */
-
- if (!(hostdata->flags & FLAG_NCR53C400)) {
- while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
- /* Wait for clean handshake */
- while (NCR5380_read(STATUS_REG) & SR_REQ);
- d[c - 1] = NCR5380_read(INPUT_DATA_REG);
- }
+ /*
+ * We can't disable DMA mode after successfully transferring
+ * what we plan to be the last byte, since that would open up
+ * a race condition where if the target asserted REQ before
+ * we got the DMA mode reset, the NCR5380 would have latched
+ * an additional byte into the INPUT DATA register and we'd
+ * have dropped it.
+ *
+ * The workaround was to transfer one fewer bytes than we
+ * intended to with the pseudo-DMA read function, wait for
+ * the chip to latch the last byte, read it, and then disable
+ * pseudo-DMA mode.
+ *
+ * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
+ * REQ is deasserted when ACK is asserted, and not reasserted
+ * until ACK goes false. Since the NCR5380 won't lower ACK
+ * until DACK is asserted, which won't happen unless we twiddle
+ * the DMA port or we take the NCR5380 out of DMA mode, we
+ * can guarantee that we won't handshake another extra
+ * byte.
+ */
+
+ if (!(hostdata->flags & FLAG_NCR53C400)) {
+ while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
+ /* Wait for clean handshake */
+ while (NCR5380_read(STATUS_REG) & SR_REQ);
+ d[c - 1] = NCR5380_read(INPUT_DATA_REG);
+ }
}
#endif
- } else {
+} else {
#ifdef DMA_WORKS_RIGHT
- foo = NCR5380_pwrite(instance, d, c);
+ foo = NCR5380_pwrite(instance, d, c);
#else
- int timeout;
+ int timeout;
#if (NDEBUG & NDEBUG_C400_PWRITE)
printk("About to pwrite %d bytes\n", c);
#endif
if (!(foo = NCR5380_pwrite(instance, d, c))) {
- /*
- * Wait for the last byte to be sent. If REQ is being asserted for
- * the byte we're interested, we'll ACK it and it will go false.
- */
- if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
- timeout = 20000;
+ /*
+ * Wait for the last byte to be sent. If REQ is being asserted for
+ * the byte we're interested, we'll ACK it and it will go false.
+ */
+ if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
+ timeout = 20000;
#if 1
#if 1
- while (!(NCR5380_read(BUS_AND_STATUS_REG) &
- BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) &
- BASR_PHASE_MATCH));
+ while (!(NCR5380_read(BUS_AND_STATUS_REG) &
+ BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) &
+ BASR_PHASE_MATCH));
#else
- if (NCR5380_read(STATUS_REG) & SR_REQ) {
- for (; timeout &&
- !(NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK);
- --timeout);
- for (; timeout && (NCR5380_read(STATUS_REG) & SR_REQ);
- --timeout);
- }
+ if (NCR5380_read(STATUS_REG) & SR_REQ) {
+ for (; timeout &&
+ !(NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK);
+ --timeout);
+ for (; timeout && (NCR5380_read(STATUS_REG) & SR_REQ);
+ --timeout);
+ }
#endif
-
+
#if (NDEBUG & NDEBUG_LAST_BYTE_SENT)
- if (!timeout)
- printk("scsi%d : timed out on last byte\n",
- instance->host_no);
+ if (!timeout)
+ printk("scsi%d : timed out on last byte\n",
+ instance->host_no);
#endif
- if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
- hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
- if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
- hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
+ if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
+ hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
+ if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
+ hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
#if (NDEBUG & NDEBUG_LAST_BYTE_SENT)
- printk("scsi%d : last bit sent works\n",
- instance->host_no);
+ printk("scsi%d : last bit sent works\n",
+ instance->host_no);
#endif
- }
- }
- } else {
+ }
+ }
+ } else {
#if (NDEBUG & NDEBUG_C400_PWRITE)
- printk("Waiting for LASTBYTE\n");
+ printk("Waiting for LASTBYTE\n");
#endif
- while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
+ while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
#if (NDEBUG & NDEBUG_C400_PWRITE)
- printk("Got LASTBYTE\n");
+ printk("Got LASTBYTE\n");
#endif
- }
+ }
#else
- udelay (5);
+ udelay(5);
#endif
- }
+ }
#endif
- }
-
- NCR5380_write(MODE_REG, MR_BASE);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ }
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
+ if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) {
#if (NDEBUG & NDEBUG_C400_PWRITE)
- printk("53C400w: Checking for IRQ\n");
+ printk("53C400w: Checking for IRQ\n");
#endif
- if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
+ if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) {
#if (NDEBUG & NDEBUG_C400_PWRITE)
- printk("53C400w: got it, reading reset interrupt reg\n");
+ printk("53C400w: got it, reading reset interrupt reg\n");
#endif
- NCR5380_read(RESET_PARITY_INTERRUPT_REG);
- } else {
- printk("53C400w: IRQ NOT THERE!\n");
+ NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+ } else {
+ printk("53C400w: IRQ NOT THERE!\n");
+ }
}
- }
-
- *data = d + c;
- *count = 0;
- *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
+ *data = d + c;
+ *count = 0;
+ *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
#if 0
- NCR5380_print_phase(instance);
+ NCR5380_print_phase(instance);
#endif
#if defined(PSEUDO_DMA) && !defined(UNSAFE)
- sti();
-#endif /* defined(REAL_DMA_POLL) */
- return foo;
-#endif /* def REAL_DMA */
+ restore_flags(flags);
+#endif /* defined(REAL_DMA_POLL) */
+ return foo;
+#endif /* def REAL_DMA */
}
-#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
+#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
/*
* Function : NCR5380_information_transfer (struct Scsi_Host *instance)
*
* Purpose : run through the various SCSI phases and do as the target
- * directs us to. Operates on the currently connected command,
- * instance->connected.
+ * directs us to. Operates on the currently connected command,
+ * instance->connected.
*
* Inputs : instance, instance for which we are doing commands
*
* Side effects : SCSI things happen, the disconnected queue will be
- * modified if a command disconnects, *instance->connected will
- * change.
+ * modified if a command disconnects, *instance->connected will
+ * change.
*
* XXX Note : we need to watch for bus free or a reset condition here
- * to recover from an unexpected bus free condition.
+ * to recover from an unexpected bus free condition.
*/
-
-static void NCR5380_information_transfer (struct Scsi_Host *instance) {
- NCR5380_local_declare();
- struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
- instance->hostdata;
- unsigned char msgout = NOP;
- int sink = 0;
- int len;
+
+static void NCR5380_information_transfer(struct Scsi_Host *instance) {
+ NCR5380_local_declare();
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
+ instance->hostdata;
+ unsigned char msgout = NOP;
+ int sink = 0;
+ int len;
#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
- int transfersize;
+ int transfersize;
#endif
- unsigned char *data;
- unsigned char phase, tmp, extended_msg[10], old_phase=0xff;
- Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
- NCR5380_setup(instance);
-
- while (1) {
- tmp = NCR5380_read(STATUS_REG);
- /* We only have a valid SCSI phase when REQ is asserted */
- if (tmp & SR_REQ) {
- phase = (tmp & PHASE_MASK);
- if (phase != old_phase) {
- old_phase = phase;
+ unsigned char *data;
+ unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
+ Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
+ NCR5380_setup(instance);
+
+ while (1) {
+ tmp = NCR5380_read(STATUS_REG);
+ /* We only have a valid SCSI phase when REQ is asserted */
+ if (tmp & SR_REQ) {
+ phase = (tmp & PHASE_MASK);
+ if (phase != old_phase) {
+ old_phase = phase;
#if (NDEBUG & NDEBUG_INFORMATION)
- NCR5380_print_phase(instance);
+ NCR5380_print_phase(instance);
#endif
- }
-
- if (sink && (phase != PHASE_MSGOUT)) {
- NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
+ }
+ if (sink && (phase != PHASE_MSGOUT)) {
+ NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
- ICR_ASSERT_ACK);
- while (NCR5380_read(STATUS_REG) & SR_REQ);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
- ICR_ASSERT_ATN);
- sink = 0;
- continue;
- }
-
- switch (phase) {
- case PHASE_DATAIN:
- case PHASE_DATAOUT:
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
+ ICR_ASSERT_ACK);
+ while (NCR5380_read(STATUS_REG) & SR_REQ);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
+ ICR_ASSERT_ATN);
+ sink = 0;
+ continue;
+ }
+ switch (phase) {
+ case PHASE_DATAIN:
+ case PHASE_DATAOUT:
#if (NDEBUG & NDEBUG_NO_DATAOUT)
- printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n",
- instance->host_no);
- sink = 1;
- do_abort(instance);
- cmd->result = DID_ERROR << 16;
- cmd->done(cmd);
- return;
-#endif
- /*
- * If there is no room left in the current buffer in the
- * scatter-gather list, move onto the next one.
- */
-
- if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
- ++cmd->SCp.buffer;
- --cmd->SCp.buffers_residual;
- cmd->SCp.this_residual = cmd->SCp.buffer->length;
- cmd->SCp.ptr = cmd->SCp.buffer->address;
+ printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n",
+ instance->host_no);
+ sink = 1;
+ do_abort(instance);
+ cmd->result = DID_ERROR << 16;
+ cmd->done(cmd);
+ return;
+#endif
+ /*
+ * If there is no room left in the current buffer in the
+ * scatter-gather list, move onto the next one.
+ */
+
+ if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
+ ++cmd->SCp.buffer;
+ --cmd->SCp.buffers_residual;
+ cmd->SCp.this_residual = cmd->SCp.buffer->length;
+ cmd->SCp.ptr = cmd->SCp.buffer->address;
#if (NDEBUG & NDEBUG_INFORMATION)
- printk("scsi%d : %d bytes and %d buffers left\n",
- instance->host_no, cmd->SCp.this_residual,
- cmd->SCp.buffers_residual);
-#endif
- }
-
- /*
- * The preferred transfer method is going to be
- * PSEUDO-DMA for systems that are strictly PIO,
- * since we can let the hardware do the handshaking.
- *
- * For this to work, we need to know the transfersize
- * ahead of time, since the pseudo-DMA code will sit
- * in an unconditional loop.
- */
+ printk("scsi%d : %d bytes and %d buffers left\n",
+ instance->host_no, cmd->SCp.this_residual,
+ cmd->SCp.buffers_residual);
+#endif
+ }
+ /*
+ * The preferred transfer method is going to be
+ * PSEUDO-DMA for systems that are strictly PIO,
+ * since we can let the hardware do the handshaking.
+ *
+ * For this to work, we need to know the transfersize
+ * ahead of time, since the pseudo-DMA code will sit
+ * in an unconditional loop.
+ */
#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
- /* KLL
- * PSEUDO_DMA is defined here. If this is the g_NCR5380
- * driver then it will always be defined, so the
- * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
- * NCR5380 case. I think this is a fairly clean solution.
- * We supplement these 2 if's with the flag.
- */
+ /* KLL
+ * PSEUDO_DMA is defined here. If this is the g_NCR5380
+ * driver then it will always be defined, so the
+ * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
+ * NCR5380 case. I think this is a fairly clean solution.
+ * We supplement these 2 if's with the flag.
+ */
#ifdef NCR5380_dma_xfer_len
- if (!cmd->device->borken &&
- !(hostdata->flags & FLAG_NO_PSEUDO_DMA) &&
- (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
+ if (!cmd->device->borken &&
+ !(hostdata->flags & FLAG_NO_PSEUDO_DMA) &&
+ (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
#else
- transfersize = cmd->transfersize;
-
-#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
- if( transfersize > 512 )
- transfersize = 512;
-#endif /* LIMIT_TRANSFERSIZE */
-
- if (!cmd->device->borken && transfersize &&
- !(hostdata->flags & FLAG_NO_PSEUDO_DMA) &&
- cmd->SCp.this_residual && !(cmd->SCp.this_residual %
- transfersize)) {
- /* Limit transfers to 32K, for xx400 & xx406
- * pseudoDMA that transfers in 128 bytes blocks. */
- if (transfersize > 32*1024)
- transfersize = 32*1024;
-#endif
- len = transfersize;
- if (NCR5380_transfer_dma(instance, &phase,
- &len, (unsigned char **) &cmd->SCp.ptr)) {
- /*
- * If the watchdog timer fires, all future accesses to this
- * device will use the polled-IO.
- */
- printk("scsi%d : switching target %d lun %d to slow handshake\n",
- instance->host_no, cmd->target, cmd->lun);
- cmd->device->borken = 1;
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
- ICR_ASSERT_ATN);
- sink = 1;
- do_abort(instance);
- cmd->result = DID_ERROR << 16;
- cmd->done(cmd);
- /* XXX - need to source or sink data here, as appropriate */
- } else
- cmd->SCp.this_residual -= transfersize - len;
- } else
-#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
- NCR5380_transfer_pio(instance, &phase,
- (int *) &cmd->SCp.this_residual, (unsigned char **)
- &cmd->SCp.ptr);
- break;
- case PHASE_MSGIN:
- len = 1;
- data = &tmp;
- NCR5380_transfer_pio(instance, &phase, &len, &data);
- cmd->SCp.Message = tmp;
+ transfersize = cmd->transfersize;
- switch (tmp) {
- /*
- * Linking lets us reduce the time required to get the
- * next command out to the device, hopefully this will
- * mean we don't waste another revolution due to the delays
- * required by ARBITRATION and another SELECTION.
- *
- * In the current implementation proposal, low level drivers
- * merely have to start the next command, pointed to by
- * next_link, done() is called as with unlinked commands.
- */
+#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
+ if (transfersize > 512)
+ transfersize = 512;
+#endif /* LIMIT_TRANSFERSIZE */
+
+ if (!cmd->device->borken && transfersize &&
+ !(hostdata->flags & FLAG_NO_PSEUDO_DMA) &&
+ cmd->SCp.this_residual && !(cmd->SCp.this_residual %
+ transfersize)) {
+ /* Limit transfers to 32K, for xx400 & xx406
+ * pseudoDMA that transfers in 128 bytes blocks. */
+ if (transfersize > 32 * 1024)
+ transfersize = 32 * 1024;
+#endif
+ len = transfersize;
+ if (NCR5380_transfer_dma(instance, &phase,
+ &len, (unsigned char **) &cmd->SCp.ptr)) {
+ /*
+ * If the watchdog timer fires, all future accesses to this
+ * device will use the polled-IO.
+ */
+ printk("scsi%d : switching target %d lun %d to slow handshake\n",
+ instance->host_no, cmd->target, cmd->lun);
+ cmd->device->borken = 1;
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
+ ICR_ASSERT_ATN);
+ sink = 1;
+ do_abort(instance);
+ cmd->result = DID_ERROR << 16;
+ cmd->done(cmd);
+ /* XXX - need to source or sink data here, as appropriate */
+ } else
+ cmd->SCp.this_residual -= transfersize - len;
+ } else
+#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
+ NCR5380_transfer_pio(instance, &phase,
+ (int *) &cmd->SCp.this_residual, (unsigned char **)
+ &cmd->SCp.ptr);
+ break;
+ case PHASE_MSGIN:
+ len = 1;
+ data = &tmp;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+ cmd->SCp.Message = tmp;
+
+ switch (tmp) {
+ /*
+ * Linking lets us reduce the time required to get the
+ * next command out to the device, hopefully this will
+ * mean we don't waste another revolution due to the delays
+ * required by ARBITRATION and another SELECTION.
+ *
+ * In the current implementation proposal, low level drivers
+ * merely have to start the next command, pointed to by
+ * next_link, done() is called as with unlinked commands.
+ */
#ifdef LINKED
- case LINKED_CMD_COMPLETE:
- case LINKED_FLG_CMD_COMPLETE:
- /* Accept message by clearing ACK */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
-
-#if (NDEBUG & NDEBUG_LINKED)
- printk("scsi%d : target %d lun %d linked command complete.\n",
- instance->host_no, cmd->target, cmd->lun);
-#endif
- /*
- * Sanity check : A linked command should only terminate with
- * one of these messages if there are more linked commands
- * available.
- */
-
- if (!cmd->next_link) {
- printk("scsi%d : target %d lun %d linked command complete, no next_link\n"
- instance->host_no, cmd->target, cmd->lun);
- sink = 1;
- do_abort (instance);
- return;
- }
-
- initialize_SCp(cmd->next_link);
- /* The next command is still part of this process */
- cmd->next_link->tag = cmd->tag;
- cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
-#if (NDEBUG & NDEBUG_LINKED)
- printk("scsi%d : target %d lun %d linked request done, calling scsi_done().\n",
- instance->host_no, cmd->target, cmd->lun);
+ case LINKED_CMD_COMPLETE:
+ case LINKED_FLG_CMD_COMPLETE:
+ /* Accept message by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+#if (NDEBUG & NDEBUG_LINKED)
+ printk("scsi%d : target %d lun %d linked command complete.\n",
+ instance->host_no, cmd->target, cmd->lun);
+#endif
+ /*
+ * Sanity check : A linked command should only terminate with
+ * one of these messages if there are more linked commands
+ * available.
+ */
+
+ if (!cmd->next_link) {
+ printk("scsi%d : target %d lun %d linked command complete, no next_link\n"
+ instance->host_no, cmd->target, cmd->lun);
+ sink = 1;
+ do_abort(instance);
+ return;
+ }
+ initialize_SCp(cmd->next_link);
+ /* The next command is still part of this process */
+ cmd->next_link->tag = cmd->tag;
+ cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
+#if (NDEBUG & NDEBUG_LINKED)
+ printk("scsi%d : target %d lun %d linked request done, calling scsi_done().\n",
+ instance->host_no, cmd->target, cmd->lun);
#endif
#ifdef NCR5380_STATS
- collect_stats(hostdata, cmd);
+ collect_stats(hostdata, cmd);
#endif
- cmd->scsi_done(cmd);
- cmd = hostdata->connected;
- break;
-#endif /* def LINKED */
- case ABORT:
- case COMMAND_COMPLETE:
- /* Accept message by clearing ACK */
- sink = 1;
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- hostdata->connected = NULL;
+ cmd->scsi_done(cmd);
+ cmd = hostdata->connected;
+ break;
+#endif /* def LINKED */
+ case ABORT:
+ case COMMAND_COMPLETE:
+ /* Accept message by clearing ACK */
+ sink = 1;
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ hostdata->connected = NULL;
#if (NDEBUG & NDEBUG_QUEUES)
- printk("scsi%d : command for target %d, lun %d completed\n",
- instance->host_no, cmd->target, cmd->lun);
+ printk("scsi%d : command for target %d, lun %d completed\n",
+ instance->host_no, cmd->target, cmd->lun);
#endif
- hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
+ hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
- /*
- * I'm not sure what the correct thing to do here is :
- *
- * If the command that just executed is NOT a request
- * sense, the obvious thing to do is to set the result
- * code to the values of the stored parameters.
- *
- * If it was a REQUEST SENSE command, we need some way
- * to differentiate between the failure code of the original
- * and the failure code of the REQUEST sense - the obvious
- * case is success, where we fall through and leave the result
- * code unchanged.
- *
- * The non-obvious place is where the REQUEST SENSE failed
- */
-
- if (cmd->cmnd[0] != REQUEST_SENSE)
- cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
- else if (cmd->SCp.Status != GOOD)
- cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
-
-#ifdef AUTOSENSE
- if ((cmd->cmnd[0] != REQUEST_SENSE) &&
- (cmd->SCp.Status == CHECK_CONDITION)) {
-#if (NDEBUG & NDEBUG_AUTOSENSE)
- printk("scsi%d : performing request sense\n",
- instance->host_no);
-#endif
- cmd->cmnd[0] = REQUEST_SENSE;
- cmd->cmnd[1] &= 0xe0;
- cmd->cmnd[2] = 0;
- cmd->cmnd[3] = 0;
- cmd->cmnd[4] = sizeof(cmd->sense_buffer);
- cmd->cmnd[5] = 0;
-
- cmd->SCp.buffer = NULL;
- cmd->SCp.buffers_residual = 0;
- cmd->SCp.ptr = (char *) cmd->sense_buffer;
- cmd->SCp.this_residual = sizeof(cmd->sense_buffer);
+ /*
+ * I'm not sure what the correct thing to do here is :
+ *
+ * If the command that just executed is NOT a request
+ * sense, the obvious thing to do is to set the result
+ * code to the values of the stored parameters.
+ *
+ * If it was a REQUEST SENSE command, we need some way
+ * to differentiate between the failure code of the original
+ * and the failure code of the REQUEST sense - the obvious
+ * case is success, where we fall through and leave the result
+ * code unchanged.
+ *
+ * The non-obvious place is where the REQUEST SENSE failed
+ */
+
+ if (cmd->cmnd[0] != REQUEST_SENSE)
+ cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
+ else if (cmd->SCp.Status != GOOD)
+ cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
- cli();
- LIST(cmd,hostdata->issue_queue);
- cmd->host_scribble = (unsigned char *)
- hostdata->issue_queue;
- hostdata->issue_queue = (Scsi_Cmnd *) cmd;
- sti();
+#ifdef AUTOSENSE
+ if ((cmd->cmnd[0] != REQUEST_SENSE) &&
+ (cmd->SCp.Status == CHECK_CONDITION)) {
+ unsigned long flags;
+#if (NDEBUG & NDEBUG_AUTOSENSE)
+ printk("scsi%d : performing request sense\n",
+ instance->host_no);
+#endif
+ cmd->cmnd[0] = REQUEST_SENSE;
+ cmd->cmnd[1] &= 0xe0;
+ cmd->cmnd[2] = 0;
+ cmd->cmnd[3] = 0;
+ cmd->cmnd[4] = sizeof(cmd->sense_buffer);
+ cmd->cmnd[5] = 0;
+
+ cmd->SCp.buffer = NULL;
+ cmd->SCp.buffers_residual = 0;
+ cmd->SCp.ptr = (char *) cmd->sense_buffer;
+ cmd->SCp.this_residual = sizeof(cmd->sense_buffer);
+
+ save_flags(flags);
+ cli();
+ LIST(cmd, hostdata->issue_queue);
+ cmd->host_scribble = (unsigned char *)
+ hostdata->issue_queue;
+ hostdata->issue_queue = (Scsi_Cmnd *) cmd;
+ restore_flags(flags);
#if (NDEBUG & NDEBUG_QUEUES)
- printk("scsi%d : REQUEST SENSE added to head of issue queue\n",instance->host_no);
+ printk("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no);
#endif
- } else {
-#endif /* def AUTOSENSE */
+ } else {
+#endif /* def AUTOSENSE */
#ifdef NCR5380_STATS
- collect_stats(hostdata, cmd);
+ collect_stats(hostdata, cmd);
#endif
- cmd->scsi_done(cmd);
- }
+ cmd->scsi_done(cmd);
+ }
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- /*
- * Restore phase bits to 0 so an interrupted selection,
- * arbitration can resume.
- */
- NCR5380_write(TARGET_COMMAND_REG, 0);
-
- while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
- barrier();
- return;
- case MESSAGE_REJECT:
- /* Accept message by clearing ACK */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- switch (hostdata->last_message) {
- case HEAD_OF_QUEUE_TAG:
- case ORDERED_QUEUE_TAG:
- case SIMPLE_QUEUE_TAG:
- cmd->device->tagged_queue = 0;
- hostdata->busy[cmd->target] |= (1 << cmd->lun);
- break;
- default:
- break;
- }
- case DISCONNECT:
- /* Accept message by clearing ACK */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- cmd->device->disconnect = 1;
- cli();
- LIST(cmd,hostdata->disconnected_queue);
- cmd->host_scribble = (unsigned char *)
- hostdata->disconnected_queue;
- hostdata->connected = NULL;
- hostdata->disconnected_queue = cmd;
- sti();
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ /*
+ * Restore phase bits to 0 so an interrupted selection,
+ * arbitration can resume.
+ */
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+
+ while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
+ barrier();
+ return;
+ case MESSAGE_REJECT:
+ /* Accept message by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ switch (hostdata->last_message) {
+ case HEAD_OF_QUEUE_TAG:
+ case ORDERED_QUEUE_TAG:
+ case SIMPLE_QUEUE_TAG:
+ cmd->device->tagged_queue = 0;
+ hostdata->busy[cmd->target] |= (1 << cmd->lun);
+ break;
+ default:
+ break;
+ }
+ case DISCONNECT: {
+ unsigned long flags;
+ /* Accept message by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ cmd->device->disconnect = 1;
+ save_flags(flags);
+ cli();
+ LIST(cmd, hostdata->disconnected_queue);
+ cmd->host_scribble = (unsigned char *)
+ hostdata->disconnected_queue;
+ hostdata->connected = NULL;
+ hostdata->disconnected_queue = cmd;
+ restore_flags(flags);
#if (NDEBUG & NDEBUG_QUEUES)
- printk("scsi%d : command for target %d lun %d was moved from connected to"
- " the disconnected_queue\n", instance->host_no,
- cmd->target, cmd->lun);
-#endif
- /*
- * Restore phase bits to 0 so an interrupted selection,
- * arbitration can resume.
- */
- NCR5380_write(TARGET_COMMAND_REG, 0);
-
- /* Enable reselect interrupts */
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- /* Wait for bus free to avoid nasty timeouts */
- while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
- barrier();
+ printk("scsi%d : command for target %d lun %d was moved from connected to"
+ " the disconnected_queue\n", instance->host_no,
+ cmd->target, cmd->lun);
+#endif
+ /*
+ * Restore phase bits to 0 so an interrupted selection,
+ * arbitration can resume.
+ */
+ NCR5380_write(TARGET_COMMAND_REG, 0);
+
+ /* Enable reselect interrupts */
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ /* Wait for bus free to avoid nasty timeouts */
+ while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
+ barrier();
#if 0
- NCR5380_print_status(instance);
+ NCR5380_print_status(instance);
#endif
- return;
- /*
- * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
- * operation, in violation of the SCSI spec so we can safely
- * ignore SAVE/RESTORE pointers calls.
- *
- * Unfortunately, some disks violate the SCSI spec and
- * don't issue the required SAVE_POINTERS message before
- * disconnecting, and we have to break spec to remain
- * compatible.
- */
- case SAVE_POINTERS:
- case RESTORE_POINTERS:
- /* Accept message by clearing ACK */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- break;
- case EXTENDED_MESSAGE:
+ return;
+ }
+ /*
+ * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
+ * operation, in violation of the SCSI spec so we can safely
+ * ignore SAVE/RESTORE pointers calls.
+ *
+ * Unfortunately, some disks violate the SCSI spec and
+ * don't issue the required SAVE_POINTERS message before
+ * disconnecting, and we have to break spec to remain
+ * compatible.
+ */
+ case SAVE_POINTERS:
+ case RESTORE_POINTERS:
+ /* Accept message by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ break;
+ case EXTENDED_MESSAGE:
/*
* Extended messages are sent in the following format :
- * Byte
- * 0 EXTENDED_MESSAGE == 1
- * 1 length (includes one byte for code, doesn't
- * include first two bytes)
- * 2 code
- * 3..length+1 arguments
+ * Byte
+ * 0 EXTENDED_MESSAGE == 1
+ * 1 length (includes one byte for code, doesn't
+ * include first two bytes)
+ * 2 code
+ * 3..length+1 arguments
*
* Start the extended message buffer with the EXTENDED_MESSAGE
* byte, since print_msg() wants the whole thing.
*/
- extended_msg[0] = EXTENDED_MESSAGE;
- /* Accept first byte by clearing ACK */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ extended_msg[0] = EXTENDED_MESSAGE;
+ /* Accept first byte by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
#if (NDEBUG & NDEBUG_EXTENDED)
- printk("scsi%d : receiving extended message\n",
- instance->host_no);
+ printk("scsi%d : receiving extended message\n",
+ instance->host_no);
#endif
- len = 2;
- data = extended_msg + 1;
- phase = PHASE_MSGIN;
- NCR5380_transfer_pio(instance, &phase, &len, &data);
+ len = 2;
+ data = extended_msg + 1;
+ phase = PHASE_MSGIN;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
#if (NDEBUG & NDEBUG_EXTENDED)
- printk("scsi%d : length=%d, code=0x%02x\n",
- instance->host_no, (int) extended_msg[1],
- (int) extended_msg[2]);
+ printk("scsi%d : length=%d, code=0x%02x\n",
+ instance->host_no, (int) extended_msg[1],
+ (int) extended_msg[2]);
#endif
- if (!len && extended_msg[1] <=
- (sizeof (extended_msg) - 1)) {
- /* Accept third byte by clearing ACK */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- len = extended_msg[1] - 1;
- data = extended_msg + 3;
- phase = PHASE_MSGIN;
+ if (!len && extended_msg[1] <=
+ (sizeof(extended_msg) - 1)) {
+ /* Accept third byte by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ len = extended_msg[1] - 1;
+ data = extended_msg + 3;
+ phase = PHASE_MSGIN;
- NCR5380_transfer_pio(instance, &phase, &len, &data);
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
#if (NDEBUG & NDEBUG_EXTENDED)
- printk("scsi%d : message received, residual %d\n",
- instance->host_no, len);
+ printk("scsi%d : message received, residual %d\n",
+ instance->host_no, len);
#endif
- switch (extended_msg[2]) {
- case EXTENDED_SDTR:
- case EXTENDED_WDTR:
- case EXTENDED_MODIFY_DATA_POINTER:
- case EXTENDED_EXTENDED_IDENTIFY:
- tmp = 0;
- }
- } else if (len) {
- printk("scsi%d: error receiving extended message\n",
- instance->host_no);
- tmp = 0;
- } else {
- printk("scsi%d: extended message code %02x length %d is too long\n",
- instance->host_no, extended_msg[2], extended_msg[1]);
- tmp = 0;
- }
- /* Fall through to reject message */
-
- /*
- * If we get something weird that we aren't expecting,
- * reject it.
- */
- default:
- if (!tmp) {
- printk("scsi%d: rejecting message ", instance->host_no);
- print_msg (extended_msg);
- printk("\n");
- } else if (tmp != EXTENDED_MESSAGE)
- printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n",
- instance->host_no, tmp, cmd->target, cmd->lun);
- else
- printk("scsi%d: rejecting unknown extended message code %02x, length %d from target %d, lun %d\n",
- instance->host_no, extended_msg[1], extended_msg[0], cmd->target, cmd->lun);
-
- msgout = MESSAGE_REJECT;
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
- ICR_ASSERT_ATN);
- break;
- } /* switch (tmp) */
- break;
- case PHASE_MSGOUT:
- len = 1;
- data = &msgout;
- hostdata->last_message = msgout;
- NCR5380_transfer_pio(instance, &phase, &len, &data);
- if (msgout == ABORT) {
- hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
- hostdata->connected = NULL;
- cmd->result = DID_ERROR << 16;
+ switch (extended_msg[2]) {
+ case EXTENDED_SDTR:
+ case EXTENDED_WDTR:
+ case EXTENDED_MODIFY_DATA_POINTER:
+ case EXTENDED_EXTENDED_IDENTIFY:
+ tmp = 0;
+ }
+ } else if (len) {
+ printk("scsi%d: error receiving extended message\n",
+ instance->host_no);
+ tmp = 0;
+ } else {
+ printk("scsi%d: extended message code %02x length %d is too long\n",
+ instance->host_no, extended_msg[2], extended_msg[1]);
+ tmp = 0;
+ }
+ /* Fall through to reject message */
+
+ /*
+ * If we get something weird that we aren't expecting,
+ * reject it.
+ */
+ default:
+ if (!tmp) {
+ printk("scsi%d: rejecting message ", instance->host_no);
+ print_msg(extended_msg);
+ printk("\n");
+ } else if (tmp != EXTENDED_MESSAGE)
+ printk("scsi%d: rejecting unknown message %02x from target %d, lun %d\n",
+ instance->host_no, tmp, cmd->target, cmd->lun);
+ else
+ printk("scsi%d: rejecting unknown extended message code %02x, length %d from target %d, lun %d\n",
+ instance->host_no, extended_msg[1], extended_msg[0], cmd->target, cmd->lun);
+
+ msgout = MESSAGE_REJECT;
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
+ ICR_ASSERT_ATN);
+ break;
+ } /* switch (tmp) */
+ break;
+ case PHASE_MSGOUT:
+ len = 1;
+ data = &msgout;
+ hostdata->last_message = msgout;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+ if (msgout == ABORT) {
+ hostdata->busy[cmd->target] &= ~(1 << cmd->lun);
+ hostdata->connected = NULL;
+ cmd->result = DID_ERROR << 16;
#ifdef NCR5380_STATS
- collect_stats(hostdata, cmd);
+ collect_stats(hostdata, cmd);
#endif
- cmd->scsi_done(cmd);
- NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
- return;
- }
- msgout = NOP;
- break;
- case PHASE_CMDOUT:
- len = cmd->cmd_len;
- data = cmd->cmnd;
- /*
- * XXX for performance reasons, on machines with a
- * PSEUDO-DMA architecture we should probably
- * use the dma transfer function.
- */
- NCR5380_transfer_pio(instance, &phase, &len,
- &data);
+ cmd->scsi_done(cmd);
+ NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+ return;
+ }
+ msgout = NOP;
+ break;
+ case PHASE_CMDOUT:
+ len = cmd->cmd_len;
+ data = cmd->cmnd;
+ /*
+ * XXX for performance reasons, on machines with a
+ * PSEUDO-DMA architecture we should probably
+ * use the dma transfer function.
+ */
+ NCR5380_transfer_pio(instance, &phase, &len,
+ &data);
#ifdef USLEEP
- if (!disconnect && should_disconnect(cmd->cmnd[0])) {
- hostdata->time_expires = jiffies + USLEEP_SLEEP;
+ if (!disconnect && should_disconnect(cmd->cmnd[0])) {
+ hostdata->time_expires = jiffies + USLEEP_SLEEP;
#if (NDEBUG & NDEBUG_USLEEP)
- printk("scsi%d : issued command, sleeping until %ul\n", instance->host_no,
- hostdata->time_expires);
+ printk("scsi%d : issued command, sleeping until %ul\n", instance->host_no,
+ hostdata->time_expires);
#endif
- NCR5380_set_timer (instance);
- return;
- }
-#endif /* def USLEEP */
- break;
- case PHASE_STATIN:
- len = 1;
- data = &tmp;
- NCR5380_transfer_pio(instance, &phase, &len, &data);
- cmd->SCp.Status = tmp;
- break;
- default:
- printk("scsi%d : unknown phase\n", instance->host_no);
+ NCR5380_set_timer(instance);
+ return;
+ }
+#endif /* def USLEEP */
+ break;
+ case PHASE_STATIN:
+ len = 1;
+ data = &tmp;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+ cmd->SCp.Status = tmp;
+ break;
+ default:
+ printk("scsi%d : unknown phase\n", instance->host_no);
#ifdef NDEBUG
- NCR5380_print(instance);
+ NCR5380_print(instance);
#endif
- } /* switch(phase) */
- } /* if (tmp * SR_REQ) */
+ } /* switch(phase) */
+ } /* if (tmp * SR_REQ) */
#ifdef USLEEP
- else {
- if (!disconnect && hostdata->time_expires && jiffies >
- hostdata->time_expires) {
- hostdata->time_expires = jiffies + USLEEP_SLEEP;
+ else {
+ if (!disconnect && hostdata->time_expires && jiffies >
+ hostdata->time_expires) {
+ hostdata->time_expires = jiffies + USLEEP_SLEEP;
#if (NDEBUG & NDEBUG_USLEEP)
- printk("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no,
- hostdata->time_expires);
+ printk("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no,
+ hostdata->time_expires);
#endif
- NCR5380_set_timer (instance);
- return;
- }
- }
+ NCR5380_set_timer(instance);
+ return;
+ }
+ }
#endif
- } /* while (1) */
+ } /* while (1) */
}
/*
* Function : void NCR5380_reselect (struct Scsi_Host *instance)
*
* Purpose : does reselection, initializing the instance->connected
- * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
- * nexus has been reestablished,
- *
+ * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
+ * nexus has been reestablished,
+ *
* Inputs : instance - this instance of the NCR5380.
*
*/
-static void NCR5380_reselect (struct Scsi_Host *instance) {
- NCR5380_local_declare();
- struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
- instance->hostdata;
- unsigned char target_mask;
- unsigned char lun, phase;
- int len;
+static void NCR5380_reselect(struct Scsi_Host *instance) {
+ NCR5380_local_declare();
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
+ instance->hostdata;
+ unsigned char target_mask;
+ unsigned char lun, phase;
+ int len;
#ifdef SCSI2
- unsigned char tag;
+ unsigned char tag;
#endif
- unsigned char msg[3];
- unsigned char *data;
- Scsi_Cmnd *tmp = NULL, *prev;
- int abort = 0;
- NCR5380_setup(instance);
-
- /*
- * Disable arbitration, etc. since the host adapter obviously
- * lost, and tell an interrupted NCR5380_select() to restart.
- */
+ unsigned char msg[3];
+ unsigned char *data;
+ Scsi_Cmnd *tmp = NULL, *prev;
+ int abort = 0;
+ NCR5380_setup(instance);
+
+ /*
+ * Disable arbitration, etc. since the host adapter obviously
+ * lost, and tell an interrupted NCR5380_select() to restart.
+ */
- NCR5380_write(MODE_REG, MR_BASE);
- hostdata->restart_select = 1;
+ NCR5380_write(MODE_REG, MR_BASE);
+ hostdata->restart_select = 1;
- target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
+ target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
#if (NDEBUG & NDEBUG_RESELECTION)
- printk("scsi%d : reselect\n", instance->host_no);
+ printk("scsi%d : reselect\n", instance->host_no);
#endif
- /*
- * At this point, we have detected that our SCSI ID is on the bus,
- * SEL is true and BSY was false for at least one bus settle delay
- * (400 ns).
- *
- * We must assert BSY ourselves, until the target drops the SEL
- * signal.
- */
-
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
-
- while (NCR5380_read(STATUS_REG) & SR_SEL);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
-
- /*
- * Wait for target to go into MSGIN.
- */
-
- while (!(NCR5380_read(STATUS_REG) & SR_REQ));
-
- len = 1;
- data = msg;
- phase = PHASE_MSGIN;
- NCR5380_transfer_pio(instance, &phase, &len, &data);
-
-
- if (!msg[0] & 0x80) {
- printk("scsi%d : expecting IDENTIFY message, got ",
- instance->host_no);
- print_msg(msg);
- abort = 1;
- } else {
- /* Accept message by clearing ACK */
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
- lun = (msg[0] & 0x07);
-
/*
- * We need to add code for SCSI-II to track which devices have
- * I_T_L_Q nexuses established, and which have simple I_T_L
- * nexuses so we can chose to do additional data transfer.
- */
+ * At this point, we have detected that our SCSI ID is on the bus,
+ * SEL is true and BSY was false for at least one bus settle delay
+ * (400 ns).
+ *
+ * We must assert BSY ourselves, until the target drops the SEL
+ * signal.
+ */
+
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
+
+ while (NCR5380_read(STATUS_REG) & SR_SEL);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+ /*
+ * Wait for target to go into MSGIN.
+ */
+
+ while (!(NCR5380_read(STATUS_REG) & SR_REQ));
+
+ len = 1;
+ data = msg;
+ phase = PHASE_MSGIN;
+ NCR5380_transfer_pio(instance, &phase, &len, &data);
+
+
+ if (!msg[0] & 0x80) {
+ printk("scsi%d : expecting IDENTIFY message, got ",
+ instance->host_no);
+ print_msg(msg);
+ abort = 1;
+ } else {
+ /* Accept message by clearing ACK */
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+ lun = (msg[0] & 0x07);
+
+ /*
+ * We need to add code for SCSI-II to track which devices have
+ * I_T_L_Q nexuses established, and which have simple I_T_L
+ * nexuses so we can chose to do additional data transfer.
+ */
#ifdef SCSI2
#error "SCSI-II tagged queueing is not supported yet"
#endif
- /*
- * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
- * just reestablished, and remove it from the disconnected queue.
- */
+ /*
+ * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
+ * just reestablished, and remove it from the disconnected queue.
+ */
- for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
- tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
- if ((target_mask == (1 << tmp->target)) && (lun == tmp->lun)
+ for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
+ tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble)
+ if ((target_mask == (1 << tmp->target)) && (lun == tmp->lun)
#ifdef SCSI2
- && (tag == tmp->tag)
+ && (tag == tmp->tag)
#endif
-) {
- if (prev) {
- REMOVE(prev,prev->host_scribble,tmp,tmp->host_scribble);
- prev->host_scribble = tmp->host_scribble;
- } else {
- REMOVE(-1,hostdata->disconnected_queue,tmp,tmp->host_scribble);
- hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
- }
- tmp->host_scribble = NULL;
- break;
- }
-
- if (!tmp) {
+ ) {
+ if (prev) {
+ REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble);
+ prev->host_scribble = tmp->host_scribble;
+ } else {
+ REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble);
+ hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble;
+ }
+ tmp->host_scribble = NULL;
+ break;
+ }
+ if (!tmp) {
#ifdef SCSI2
- printk("scsi%d : warning : target bitmask %02x lun %d tag %d not in disconnect_queue.\n",
- instance->host_no, target_mask, lun, tag);
+ printk("scsi%d : warning : target bitmask %02x lun %d tag %d not in disconnect_queue.\n",
+ instance->host_no, target_mask, lun, tag);
#else
- printk("scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n",
- instance->host_no, target_mask, lun);
+ printk("scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n",
+ instance->host_no, target_mask, lun);
#endif
- /*
- * Since we have an established nexus that we can't do anything with,
- * we must abort it.
- */
- abort = 1;
+ /*
+ * Since we have an established nexus that we can't do anything with,
+ * we must abort it.
+ */
+ abort = 1;
+ }
}
- }
- if (abort) {
- do_abort (instance);
- } else {
- hostdata->connected = tmp;
+ if (abort) {
+ do_abort(instance);
+ } else {
+ hostdata->connected = tmp;
#if (NDEBUG & NDEBUG_RESELECTION)
- printk("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n",
- instance->host_no, tmp->target, tmp->lun, tmp->tag);
+ printk("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n",
+ instance->host_no, tmp->target, tmp->lun, tmp->tag);
#endif
- }
+ }
}
/*
* Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
*
* Purpose : called by interrupt handler when DMA finishes or a phase
- * mismatch occurs (which would finish the DMA transfer).
+ * mismatch occurs (which would finish the DMA transfer).
*
* Inputs : instance - this instance of the NCR5380.
*
* Returns : pointer to the Scsi_Cmnd structure for which the I_T_L
- * nexus has been reestablished, on failure NULL is returned.
+ * nexus has been reestablished, on failure NULL is returned.
*/
#ifdef REAL_DMA
-static void NCR5380_dma_complete (NCR5380_instance *instance) {
- NCR5380_local_declare();
- struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *
- instance->hostdata);
- int transferred;
- NCR5380_setup(instance);
-
- /*
- * XXX this might not be right.
- *
- * Wait for final byte to transfer, ie wait for ACK to go false.
- *
- * We should use the Last Byte Sent bit, unfortunately this is
- * not available on the 5380/5381 (only the various CMOS chips)
- */
-
- while (NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK);
-
- NCR5380_write(MODE_REG, MR_BASE);
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
-
- /*
- * The only places we should see a phase mismatch and have to send
- * data from the same set of pointers will be the data transfer
- * phases. So, residual, requested length are only important here.
- */
-
- if (!(hostdata->connected->SCp.phase & SR_CD)) {
- transferred = instance->dmalen - NCR5380_dma_residual();
- hostdata->connected->SCp.this_residual -= transferred;
- hostdata->connected->SCp.ptr += transferred;
- }
+static void NCR5380_dma_complete(NCR5380_instance * instance) {
+ NCR5380_local_declare();
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *
+ instance->hostdata);
+ int transferred;
+ NCR5380_setup(instance);
+
+ /*
+ * XXX this might not be right.
+ *
+ * Wait for final byte to transfer, ie wait for ACK to go false.
+ *
+ * We should use the Last Byte Sent bit, unfortunately this is
+ * not available on the 5380/5381 (only the various CMOS chips)
+ */
+
+ while (NCR5380_read(BUS_AND_STATUS_REG) & BASR_ACK);
+
+ NCR5380_write(MODE_REG, MR_BASE);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+
+ /*
+ * The only places we should see a phase mismatch and have to send
+ * data from the same set of pointers will be the data transfer
+ * phases. So, residual, requested length are only important here.
+ */
+
+ if (!(hostdata->connected->SCp.phase & SR_CD)) {
+ transferred = instance->dmalen - NCR5380_dma_residual();
+ hostdata->connected->SCp.this_residual -= transferred;
+ hostdata->connected->SCp.ptr += transferred;
+ }
}
-#endif /* def REAL_DMA */
+#endif /* def REAL_DMA */
/*
* Function : int NCR5380_abort (Scsi_Cmnd *cmd)
@@ -3040,44 +3132,46 @@
* Purpose : abort a command
*
* Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
- * host byte of the result field to, if zero DID_ABORTED is
- * used.
+ * host byte of the result field to, if zero DID_ABORTED is
+ * used.
*
* Returns : 0 - success, -1 on failure.
*
* XXX - there is no way to abort the command that is currently
- * connected, you have to wait for it to complete. If this is
- * a problem, we could implement longjmp() / setjmp(), setjmp()
- * called where the loop started in NCR5380_main().
+ * connected, you have to wait for it to complete. If this is
+ * a problem, we could implement longjmp() / setjmp(), setjmp()
+ * called where the loop started in NCR5380_main().
*/
#ifndef NCR5380_abort
static
#endif
-int NCR5380_abort (Scsi_Cmnd *cmd) {
- NCR5380_local_declare();
- struct Scsi_Host *instance = cmd->host;
- struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
- instance->hostdata;
- Scsi_Cmnd *tmp, **prev;
+int NCR5380_abort(Scsi_Cmnd * cmd) {
+ NCR5380_local_declare();
+ unsigned long flags;
+ struct Scsi_Host *instance = cmd->host;
+ struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)
+ instance->hostdata;
+ Scsi_Cmnd *tmp, **prev;
- printk("scsi%d : aborting command\n", instance->host_no);
- print_Scsi_Cmnd (cmd);
+ printk("scsi%d : aborting command\n", instance->host_no);
+ print_Scsi_Cmnd(cmd);
- NCR5380_print_status (instance);
+ NCR5380_print_status(instance);
- printk("scsi%d : aborting command\n", instance->host_no);
- print_Scsi_Cmnd (cmd);
+ printk("scsi%d : aborting command\n", instance->host_no);
+ print_Scsi_Cmnd(cmd);
- NCR5380_print_status (instance);
+ NCR5380_print_status(instance);
- cli();
- NCR5380_setup(instance);
+ save_flags(flags);
+ cli();
+ NCR5380_setup(instance);
#if (NDEBUG & NDEBUG_ABORT)
- printk("scsi%d : abort called\n", instance->host_no);
- printk(" basr 0x%X, sr 0x%X\n",
- NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG));
+ printk("scsi%d : abort called\n", instance->host_no);
+ printk(" basr 0x%X, sr 0x%X\n",
+ NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG));
#endif
#if 0
@@ -3087,17 +3181,17 @@
* information transfer routine can exit cleanly.
*/
- if (hostdata->connected == cmd) {
+ if (hostdata->connected == cmd) {
#if (NDEBUG & NDEBUG_ABORT)
- printk("scsi%d : aborting connected command\n", instance->host_no);
+ printk("scsi%d : aborting connected command\n", instance->host_no);
#endif
- hostdata->aborted = 1;
+ hostdata->aborted = 1;
/*
* We should perform BSY checking, and make sure we haven't slipped
* into BUS FREE.
*/
- NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
+ NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN);
/*
* Since we can't change phases until we've completed the current
* handshake, we have to source or sink a byte of data if the current
@@ -3107,65 +3201,65 @@
/*
* Return control to the executing NCR drive so we can clear the
* aborted flag and get back into our main loop.
- */
-
- return 0;
- }
+ */
+
+ return 0;
+ }
#endif
/*
* Case 2 : If the command hasn't been issued yet, we simply remove it
- * from the issue queue.
+ * from the issue queue.
*/
#if (NDEBUG & NDEBUG_ABORT)
- /* KLL */
- printk("scsi%d : abort going into loop.\n", instance->host_no);
+ /* KLL */
+ printk("scsi%d : abort going into loop.\n", instance->host_no);
#endif
- for (prev = (Scsi_Cmnd **) &(hostdata->issue_queue),
- tmp = (Scsi_Cmnd *) hostdata->issue_queue;
- tmp; prev = (Scsi_Cmnd **) &(tmp->host_scribble), tmp =
- (Scsi_Cmnd *) tmp->host_scribble)
- if (cmd == tmp) {
- REMOVE(5,*prev,tmp,tmp->host_scribble);
- (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
- tmp->host_scribble = NULL;
- tmp->result = DID_ABORT << 16;
- sti();
+ for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue),
+ tmp = (Scsi_Cmnd *) hostdata->issue_queue;
+ tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp =
+ (Scsi_Cmnd *) tmp->host_scribble)
+ if (cmd == tmp) {
+ REMOVE(5, *prev, tmp, tmp->host_scribble);
+ (*prev) = (Scsi_Cmnd *) tmp->host_scribble;
+ tmp->host_scribble = NULL;
+ tmp->result = DID_ABORT << 16;
+ restore_flags(flags);
#if (NDEBUG & NDEBUG_ABORT)
- printk("scsi%d : abort removed command from issue queue.\n",
- instance->host_no);
+ printk("scsi%d : abort removed command from issue queue.\n",
+ instance->host_no);
#endif
- tmp->done(tmp);
- return SCSI_ABORT_SUCCESS;
- }
+ tmp->done(tmp);
+ return SCSI_ABORT_SUCCESS;
+ }
#if (NDEBUG & NDEBUG_ABORT)
- /* KLL */
- else if (prev == tmp) printk("scsi%d : LOOP\n", instance->host_no);
+ /* KLL */
+ else if (prev == tmp)
+ printk("scsi%d : LOOP\n", instance->host_no);
#endif
/*
* Case 3 : If any commands are connected, we're going to fail the abort
- * and let the high level SCSI driver retry at a later time or
- * issue a reset.
+ * and let the high level SCSI driver retry at a later time or
+ * issue a reset.
*
- * Timeouts, and therefore aborted commands, will be highly unlikely
+ * Timeouts, and therefore aborted commands, will be highly unlikely
* and handling them cleanly in this situation would make the common
- * case of noresets less efficient, and would pollute our code. So,
- * we fail.
+ * case of noresets less efficient, and would pollute our code. So,
+ * we fail.
*/
- if (hostdata->connected) {
- sti();
+ if (hostdata->connected) {
+ restore_flags(flags);
#if (NDEBUG & NDEBUG_ABORT)
- printk("scsi%d : abort failed, command connected.\n", instance->host_no);
+ printk("scsi%d : abort failed, command connected.\n", instance->host_no);
#endif
- return SCSI_ABORT_NOT_RUNNING;
- }
-
+ return SCSI_ABORT_NOT_RUNNING;
+ }
/*
* Case 4: If the command is currently disconnected from the bus, and
- * there are no connected commands, we reconnect the I_T_L or
- * I_T_L_Q nexus associated with it, go into message out, and send
+ * there are no connected commands, we reconnect the I_T_L or
+ * I_T_L_Q nexus associated with it, go into message out, and send
* an abort message.
*
* This case is especially ugly. In order to reestablish the nexus, we
@@ -3187,42 +3281,41 @@
* it from the disconnected queue.
*/
- for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
- tmp = (Scsi_Cmnd *) tmp->host_scribble)
- if (cmd == tmp) {
- sti();
+ for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
+ tmp = (Scsi_Cmnd *) tmp->host_scribble)
+ if (cmd == tmp) {
+ restore_flags(flags);
#if (NDEBUG & NDEBUG_ABORT)
- printk("scsi%d : aborting disconnected command.\n", instance->host_no);
+ printk("scsi%d : aborting disconnected command.\n", instance->host_no);
#endif
-
- if (NCR5380_select (instance, cmd, (int) cmd->tag))
- return SCSI_ABORT_BUSY;
+
+ if (NCR5380_select(instance, cmd, (int) cmd->tag))
+ return SCSI_ABORT_BUSY;
#if (NDEBUG & NDEBUG_ABORT)
- printk("scsi%d : nexus reestablished.\n", instance->host_no);
+ printk("scsi%d : nexus reestablished.\n", instance->host_no);
#endif
- do_abort (instance);
+ do_abort(instance);
- cli();
- for (prev = (Scsi_Cmnd **) &(hostdata->disconnected_queue),
- tmp = (Scsi_Cmnd *) hostdata->disconnected_queue;
- tmp; prev = (Scsi_Cmnd **) &(tmp->host_scribble), tmp =
- (Scsi_Cmnd *) tmp->host_scribble)
- if (cmd == tmp) {
- REMOVE(5,*prev,tmp,tmp->host_scribble);
- *prev = (Scsi_Cmnd *) tmp->host_scribble;
- tmp->host_scribble = NULL;
- tmp->result = DID_ABORT << 16;
- sti();
- tmp->done(tmp);
- return SCSI_ABORT_SUCCESS;
+ cli();
+ for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue),
+ tmp = (Scsi_Cmnd *) hostdata->disconnected_queue;
+ tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp =
+ (Scsi_Cmnd *) tmp->host_scribble)
+ if (cmd == tmp) {
+ REMOVE(5, *prev, tmp, tmp->host_scribble);
+ *prev = (Scsi_Cmnd *) tmp->host_scribble;
+ tmp->host_scribble = NULL;
+ tmp->result = DID_ABORT << 16;
+ restore_flags(flags);
+ tmp->done(tmp);
+ return SCSI_ABORT_SUCCESS;
+ }
}
- }
-
/*
* Case 5 : If we reached this point, the command was not found in any of
- * the queues.
+ * the queues.
*
* We probably reached this point because of an unlikely race condition
* between the command completing successfully and the abortion code,
@@ -3230,10 +3323,10 @@
* broke.
*/
- sti();
- printk("scsi%d : warning : SCSI command probably completed successfully\n"
- " before abortion\n", instance->host_no);
- return SCSI_ABORT_NOT_RUNNING;
+ restore_flags(flags);
+ printk("scsi%d : warning : SCSI command probably completed successfully\n"
+ " before abortion\n", instance->host_no);
+ return SCSI_ABORT_NOT_RUNNING;
}
@@ -3244,18 +3337,17 @@
*
* Returns : SCSI_RESET_WAKEUP
*
- */
+ */
#ifndef NCR5380_reset
static
#endif
-int NCR5380_reset (Scsi_Cmnd *cmd, unsigned int dummy) {
- NCR5380_local_declare();
- NCR5380_setup(cmd->host);
+int NCR5380_reset(Scsi_Cmnd * cmd, unsigned int dummy) {
+ NCR5380_local_declare();
+ NCR5380_setup(cmd->host);
- NCR5380_print_status (cmd->host);
- do_reset (cmd->host);
+ NCR5380_print_status(cmd->host);
+ do_reset(cmd->host);
- return SCSI_RESET_WAKEUP;
+ return SCSI_RESET_WAKEUP;
}
-
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