patch-2.4.22 linux-2.4.22/drivers/char/sgiserial.c
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- Lines: 2236
- Date:
2003-08-25 04:44:41.000000000 -0700
- Orig file:
linux-2.4.21/drivers/char/sgiserial.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.21/drivers/char/sgiserial.c linux-2.4.22/drivers/char/sgiserial.c
@@ -0,0 +1,2235 @@
+/* sgiserial.c: Serial port driver for SGI machines.
+ *
+ * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
+ */
+
+/*
+ * Note: This driver seems to have been derived from some
+ * version of the sbus/char/zs.c driver. A lot of clean-up
+ * and bug fixes seem to have happened to the Sun driver in
+ * the intervening time. As of 21.09.1999, I have merged in
+ * ONLY the changes necessary to fix observed functional
+ * problems on the Indy. Someone really ought to do a
+ * thorough pass to merge in the rest of the updates.
+ * Better still, someone really ought to make it a common
+ * code module for both platforms. kevink@mips.com
+ *
+ * 20010616 - Klaus Naumann <spock@mgnet.de> : Make serial console work with
+ * any speed - not only 9600
+ */
+
+#include <linux/config.h> /* for CONFIG_KGDB */
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/interrupt.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/console.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <asm/uaccess.h>
+#include <asm/sgialib.h>
+#include <asm/sgi/ioc.h>
+#include <asm/sgi/ip22.h>
+
+#include "sgiserial.h"
+
+#define NUM_SERIAL 1 /* One chip on board. */
+#define NUM_CHANNELS (NUM_SERIAL * 2)
+
+struct sgi_zslayout *zs_chips[NUM_SERIAL];
+struct sgi_zschannel *zs_channels[NUM_CHANNELS];
+struct sgi_zschannel *zs_conschan;
+struct sgi_zschannel *zs_kgdbchan;
+
+struct sgi_serial zs_soft[NUM_CHANNELS];
+struct sgi_serial *zs_chain; /* IRQ servicing chain */
+static int zilog_irq = SGI_SERIAL_IRQ;
+
+/* Console hooks... */
+static int zs_cons_chanout;
+static int zs_cons_chanin;
+struct sgi_serial *zs_consinfo;
+
+static unsigned char kgdb_regs[16] = {
+ 0, 0, 0, /* write 0, 1, 2 */
+ (Rx8 | RxENABLE), /* write 3 */
+ (X16CLK | SB1 | PAR_EVEN), /* write 4 */
+ (Tx8 | TxENAB), /* write 5 */
+ 0, 0, 0, /* write 6, 7, 8 */
+ (NV), /* write 9 */
+ (NRZ), /* write 10 */
+ (TCBR | RCBR), /* write 11 */
+ 0, 0, /* BRG time constant, write 12 + 13 */
+ (BRENABL), /* write 14 */
+ (DCDIE) /* write 15 */
+};
+
+static unsigned char zscons_regs[16] = {
+ 0, /* write 0 */
+ (EXT_INT_ENAB | INT_ALL_Rx), /* write 1 */
+ 0, /* write 2 */
+ (Rx8 | RxENABLE), /* write 3 */
+ (X16CLK), /* write 4 */
+ (DTR | Tx8 | TxENAB), /* write 5 */
+ 0, 0, 0, /* write 6, 7, 8 */
+ (NV | MIE), /* write 9 */
+ (NRZ), /* write 10 */
+ (TCBR | RCBR), /* write 11 */
+ 0, 0, /* BRG time constant, write 12 + 13 */
+ (BRENABL), /* write 14 */
+ (DCDIE | CTSIE | TxUIE | BRKIE) /* write 15 */
+};
+
+#define ZS_CLOCK 3672000 /* Zilog input clock rate */
+
+DECLARE_TASK_QUEUE(tq_serial);
+
+struct tty_driver serial_driver, callout_driver;
+struct console *sgisercon;
+static int serial_refcount;
+
+/* serial subtype definitions */
+#define SERIAL_TYPE_NORMAL 1
+#define SERIAL_TYPE_CALLOUT 2
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+#undef SERIAL_DEBUG_OPEN
+
+static void change_speed(struct sgi_serial *info);
+
+static struct tty_struct *serial_table[NUM_CHANNELS];
+static struct termios *serial_termios[NUM_CHANNELS];
+static struct termios *serial_termios_locked[NUM_CHANNELS];
+
+/*
+ * tmp_buf is used as a temporary buffer by serial_write. We need to
+ * lock it in case the memcpy_fromfs blocks while swapping in a page,
+ * and some other program tries to do a serial write at the same time.
+ * Since the lock will only come under contention when the system is
+ * swapping and available memory is low, it makes sense to share one
+ * buffer across all the serial ports, since it significantly saves
+ * memory if large numbers of serial ports are open.
+ */
+static unsigned char tmp_buf[PAGE_SIZE]; /* This is cheating */
+static DECLARE_MUTEX(tmp_buf_sem);
+
+static inline int serial_paranoia_check(struct sgi_serial *info,
+ dev_t device, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+ static const char *badmagic = KERN_WARNING
+ "Warning: bad magic number for serial struct (%d, %d) in %s\n";
+ static const char *badinfo = KERN_WARNING
+ "Warning: null sgi_serial for (%d, %d) in %s\n";
+
+ if (!info) {
+ printk(badinfo, MAJOR(device), MINOR(device), routine);
+ return 1;
+ }
+ if (info->magic != SERIAL_MAGIC) {
+ printk(badmagic, MAJOR(device), MINOR(device), routine);
+ return 1;
+ }
+#endif
+ return 0;
+}
+
+/*
+ * This is used to figure out the divisor speeds and the timeouts
+ */
+static int baud_table[] = {
+ 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+ 9600, 19200, 38400, 57600, 115200, 0 };
+
+/*
+ * Reading and writing Zilog8530 registers. The delays are to make this
+ * driver work on the Sun4 which needs a settling delay after each chip
+ * register access, other machines handle this in hardware via auxiliary
+ * flip-flops which implement the settle time we do in software.
+ *
+ * read_zsreg() and write_zsreg() may get called from rs_kgdb_hook() before
+ * interrupts are enabled. Therefore we have to check ioc_iocontrol before we
+ * access it.
+ */
+static inline unsigned char read_zsreg(struct sgi_zschannel *channel,
+ unsigned char reg)
+{
+ unsigned char retval;
+ volatile unsigned char junk;
+
+ udelay(2);
+ channel->control = reg;
+ junk = sgint->istat0;
+ udelay(1);
+ retval = channel->control;
+ return retval;
+}
+
+static inline void write_zsreg(struct sgi_zschannel *channel,
+ unsigned char reg, unsigned char value)
+{
+ volatile unsigned char junk;
+
+ udelay(2);
+ channel->control = reg;
+ junk = sgint->istat0;
+ udelay(1);
+ channel->control = value;
+ junk = sgint->istat0;
+ return;
+}
+
+static inline void load_zsregs(struct sgi_zschannel *channel, unsigned char *regs)
+{
+ ZS_CLEARERR(channel);
+ ZS_CLEARFIFO(channel);
+ /* Load 'em up */
+ write_zsreg(channel, R4, regs[R4]);
+ write_zsreg(channel, R10, regs[R10]);
+ write_zsreg(channel, R3, regs[R3] & ~RxENABLE);
+ write_zsreg(channel, R5, regs[R5] & ~TxENAB);
+ write_zsreg(channel, R1, regs[R1]);
+ write_zsreg(channel, R9, regs[R9]);
+ write_zsreg(channel, R11, regs[R11]);
+ write_zsreg(channel, R12, regs[R12]);
+ write_zsreg(channel, R13, regs[R13]);
+ write_zsreg(channel, R14, regs[R14]);
+ write_zsreg(channel, R15, regs[R15]);
+ write_zsreg(channel, R3, regs[R3]);
+ write_zsreg(channel, R5, regs[R5]);
+ return;
+}
+
+/* Sets or clears DTR/RTS on the requested line */
+static inline void zs_rtsdtr(struct sgi_serial *ss, int set)
+{
+ if(set) {
+ ss->curregs[5] |= (RTS | DTR);
+ write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
+ } else {
+ ss->curregs[5] &= ~(RTS | DTR);
+ write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
+ }
+ return;
+}
+
+static inline void kgdb_chaninit(struct sgi_serial *ss, int intson, int bps)
+{
+ int brg;
+
+ if(intson) {
+ kgdb_regs[R1] = INT_ALL_Rx;
+ kgdb_regs[R9] |= MIE;
+ } else {
+ kgdb_regs[R1] = 0;
+ kgdb_regs[R9] &= ~MIE;
+ }
+ brg = BPS_TO_BRG(bps, ZS_CLOCK/ss->clk_divisor);
+ kgdb_regs[R12] = (brg & 255);
+ kgdb_regs[R13] = ((brg >> 8) & 255);
+ load_zsregs(ss->zs_channel, kgdb_regs);
+}
+
+/* Utility routines for the Zilog */
+static inline int get_zsbaud(struct sgi_serial *ss)
+{
+ struct sgi_zschannel *channel = ss->zs_channel;
+ int brg;
+
+ /* The baud rate is split up between two 8-bit registers in
+ * what is termed 'BRG time constant' format in my docs for
+ * the chip, it is a function of the clk rate the chip is
+ * receiving which happens to be constant.
+ */
+ brg = ((read_zsreg(channel, 13)&0xff) << 8);
+ brg |= (read_zsreg(channel, 12)&0xff);
+ return BRG_TO_BPS(brg, (ZS_CLOCK/(ss->clk_divisor)));
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_stop() and rs_start()
+ *
+ * This routines are called before setting or resetting tty->stopped.
+ * They enable or disable transmitter interrupts, as necessary.
+ * ------------------------------------------------------------
+ */
+static void rs_stop(struct tty_struct *tty)
+{
+ struct sgi_serial *info = (struct sgi_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_stop"))
+ return;
+
+ save_flags(flags); cli();
+ if (info->curregs[5] & TxENAB) {
+ info->curregs[5] &= ~TxENAB;
+ write_zsreg(info->zs_channel, 5, info->curregs[5]);
+ }
+ restore_flags(flags);
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+ struct sgi_serial *info = (struct sgi_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_start"))
+ return;
+
+ save_flags(flags); cli();
+ if (info->xmit_cnt && info->xmit_buf && !(info->curregs[5] & TxENAB)) {
+ info->curregs[5] |= TxENAB;
+ write_zsreg(info->zs_channel, 5, info->curregs[5]);
+ }
+ restore_flags(flags);
+}
+
+/* Drop into either the boot monitor or kadb upon receiving a break
+ * from keyboard/console input.
+ */
+static void batten_down_hatches(void)
+{
+ ArcEnterInteractiveMode();
+#if 0
+ /* If we are doing kadb, we call the debugger
+ * else we just drop into the boot monitor.
+ * Note that we must flush the user windows
+ * first before giving up control.
+ */
+ printk("\n");
+ if((((unsigned long)linux_dbvec)>=DEBUG_FIRSTVADDR) &&
+ (((unsigned long)linux_dbvec)<=DEBUG_LASTVADDR))
+ sp_enter_debugger();
+ else
+ prom_halt();
+
+ /* XXX We want to notify the keyboard driver that all
+ * XXX keys are in the up state or else weird things
+ * XXX happen...
+ */
+#endif
+ return;
+}
+
+/* On receive, this clears errors and the receiver interrupts */
+static inline void rs_recv_clear(struct sgi_zschannel *zsc)
+{
+ volatile unsigned char junk;
+
+ udelay(2);
+ zsc->control = ERR_RES;
+ junk = sgint->istat0;
+ udelay(2);
+ zsc->control = RES_H_IUS;
+ junk = sgint->istat0;
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * Here starts the interrupt handling routines. All of the following
+ * subroutines are declared as inline and are folded into
+ * rs_interrupt(). They were separated out for readability's sake.
+ *
+ * Note: rs_interrupt() is a "fast" interrupt, which means that it
+ * runs with interrupts turned off. People who may want to modify
+ * rs_interrupt() should try to keep the interrupt handler as fast as
+ * possible. After you are done making modifications, it is not a bad
+ * idea to do:
+ *
+ * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
+ *
+ * and look at the resulting assemble code in serial.s.
+ *
+ * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
+ * -----------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used by the interrupt handler to schedule
+ * processing in the software interrupt portion of the driver.
+ */
+static inline void rs_sched_event(struct sgi_serial *info,
+ int event)
+{
+ info->event |= 1 << event;
+ queue_task(&info->tqueue, &tq_serial);
+ mark_bh(SERIAL_BH);
+}
+
+#ifdef CONFIG_KGDB
+extern void set_async_breakpoint(unsigned int epc);
+#endif
+
+static inline void receive_chars(struct sgi_serial *info, struct pt_regs *regs)
+{
+ struct tty_struct *tty = info->tty;
+ volatile unsigned char junk;
+ unsigned char ch, stat;
+
+ udelay(2);
+ ch = info->zs_channel->data;
+ junk = sgint->istat0;
+ udelay(2);
+ stat = read_zsreg(info->zs_channel, R1);
+
+ /* If this is the console keyboard, we need to handle
+ * L1-A's here.
+ */
+ if(info->is_cons) {
+ if(ch==0) { /* whee, break received */
+ batten_down_hatches();
+ rs_recv_clear(info->zs_channel);
+ return;
+ } else if (ch == 1) {
+ show_state();
+ return;
+ } else if (ch == 2) {
+ show_buffers();
+ return;
+ }
+ }
+ /* Look for kgdb 'stop' character, consult the gdb documentation
+ * for remote target debugging and arch/sparc/kernel/sparc-stub.c
+ * to see how all this works.
+ */
+#ifdef CONFIG_KGDB
+ if((info->kgdb_channel) && (ch =='\003')) {
+ set_async_breakpoint(read_32bit_cp0_register(CP0_EPC));
+ goto clear_and_exit;
+ }
+#endif
+ if(!tty)
+ goto clear_and_exit;
+
+ if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+ queue_task(&tty->flip.tqueue, &tq_timer);
+ tty->flip.count++;
+ if(stat & PAR_ERR)
+ *tty->flip.flag_buf_ptr++ = TTY_PARITY;
+ else if(stat & Rx_OVR)
+ *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
+ else if(stat & CRC_ERR)
+ *tty->flip.flag_buf_ptr++ = TTY_FRAME;
+ else
+ *tty->flip.flag_buf_ptr++ = 0; /* XXX */
+ *tty->flip.char_buf_ptr++ = ch;
+
+ queue_task(&tty->flip.tqueue, &tq_timer);
+
+clear_and_exit:
+ rs_recv_clear(info->zs_channel);
+ return;
+}
+
+static inline void transmit_chars(struct sgi_serial *info)
+{
+ volatile unsigned char junk;
+
+ /* P3: In theory we have to test readiness here because a
+ * serial console can clog the chip through zs_cons_put_char().
+ * David did not do this. I think he relies on 3-chars FIFO in 8530.
+ * Let's watch for lost _output_ characters. XXX
+ */
+
+ /* SGI ADDENDUM: On most SGI machines, the Zilog does possess
+ * a 16 or 17 byte fifo, so no worries. -dm
+ */
+
+ if (info->x_char) {
+ /* Send next char */
+ udelay(2);
+ info->zs_channel->data = info->x_char;
+ junk = sgint->istat0;
+
+ info->x_char = 0;
+ goto clear_and_return;
+ }
+
+ if((info->xmit_cnt <= 0) || info->tty->stopped) {
+ /* That's peculiar... */
+ udelay(2);
+ info->zs_channel->control = RES_Tx_P;
+ junk = sgint->istat0;
+ goto clear_and_return;
+ }
+
+ /* Send char */
+ udelay(2);
+ info->zs_channel->data = info->xmit_buf[info->xmit_tail++];
+ junk = sgint->istat0;
+
+ info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+ info->xmit_cnt--;
+
+ if (info->xmit_cnt < WAKEUP_CHARS)
+ rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+
+ if(info->xmit_cnt <= 0) {
+ udelay(2);
+ info->zs_channel->control = RES_Tx_P;
+ junk = sgint->istat0;
+ goto clear_and_return;
+ }
+
+clear_and_return:
+ /* Clear interrupt */
+ udelay(2);
+ info->zs_channel->control = RES_H_IUS;
+ junk = sgint->istat0;
+ return;
+}
+
+static inline void status_handle(struct sgi_serial *info)
+{
+ volatile unsigned char junk;
+ unsigned char status;
+
+ /* Get status from Read Register 0 */
+ udelay(2);
+ status = info->zs_channel->control;
+ junk = sgint->istat0;
+ /* Clear status condition... */
+ udelay(2);
+ info->zs_channel->control = RES_EXT_INT;
+ junk = sgint->istat0;
+ /* Clear the interrupt */
+ udelay(2);
+ info->zs_channel->control = RES_H_IUS;
+ junk = sgint->istat0;
+
+#if 0
+ if(status & DCD) {
+ if((info->tty->termios->c_cflag & CRTSCTS) &&
+ ((info->curregs[3] & AUTO_ENAB)==0)) {
+ info->curregs[3] |= AUTO_ENAB;
+ write_zsreg(info->zs_channel, 3, info->curregs[3]);
+ }
+ } else {
+ if((info->curregs[3] & AUTO_ENAB)) {
+ info->curregs[3] &= ~AUTO_ENAB;
+ write_zsreg(info->zs_channel, 3, info->curregs[3]);
+ }
+ }
+#endif
+ /* Whee, if this is console input and this is a
+ * 'break asserted' status change interrupt, call
+ * the boot prom.
+ */
+ if((status & BRK_ABRT) && info->break_abort)
+ batten_down_hatches();
+
+ /* XXX Whee, put in a buffer somewhere, the status information
+ * XXX whee whee whee... Where does the information go...
+ */
+ return;
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+ struct sgi_serial * info = (struct sgi_serial *) dev_id;
+ unsigned char zs_intreg;
+
+ zs_intreg = read_zsreg(info->zs_next->zs_channel, 3);
+
+ /* NOTE: The read register 3, which holds the irq status,
+ * does so for both channels on each chip. Although
+ * the status value itself must be read from the A
+ * channel and is only valid when read from channel A.
+ * Yes... broken hardware...
+ */
+#define CHAN_A_IRQMASK (CHARxIP | CHATxIP | CHAEXT)
+#define CHAN_B_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT)
+
+ /* *** Chip 1 *** */
+ /* Channel B -- /dev/ttyb, could be the console */
+ if(zs_intreg & CHAN_B_IRQMASK) {
+ if (zs_intreg & CHBRxIP)
+ receive_chars(info, regs);
+ if (zs_intreg & CHBTxIP)
+ transmit_chars(info);
+ if (zs_intreg & CHBEXT)
+ status_handle(info);
+ }
+
+ info=info->zs_next;
+
+ /* Channel A -- /dev/ttya, could be the console */
+ if(zs_intreg & CHAN_A_IRQMASK) {
+ if (zs_intreg & CHARxIP)
+ receive_chars(info, regs);
+ if (zs_intreg & CHATxIP)
+ transmit_chars(info);
+ if (zs_intreg & CHAEXT)
+ status_handle(info);
+ }
+}
+
+/*
+ * -------------------------------------------------------------------
+ * Here ends the serial interrupt routines.
+ * -------------------------------------------------------------------
+ */
+
+/*
+ * This routine is used to handle the "bottom half" processing for the
+ * serial driver, known also the "software interrupt" processing.
+ * This processing is done at the kernel interrupt level, after the
+ * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
+ * is where time-consuming activities which can not be done in the
+ * interrupt driver proper are done; the interrupt driver schedules
+ * them using rs_sched_event(), and they get done here.
+ */
+static void do_serial_bh(void)
+{
+ run_task_queue(&tq_serial);
+}
+
+static void do_softint(void *private_)
+{
+ struct sgi_serial *info = (struct sgi_serial *) private_;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (!tty)
+ return;
+
+ if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
+ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+ tty->ldisc.write_wakeup)
+ (tty->ldisc.write_wakeup)(tty);
+ wake_up_interruptible(&tty->write_wait);
+ }
+}
+
+/*
+ * This routine is called from the scheduler tqueue when the interrupt
+ * routine has signalled that a hangup has occurred. The path of
+ * hangup processing is:
+ *
+ * serial interrupt routine -> (scheduler tqueue) ->
+ * do_serial_hangup() -> tty->hangup() -> rs_hangup()
+ *
+ */
+static void do_serial_hangup(void *private_)
+{
+ struct sgi_serial *info = (struct sgi_serial *) private_;
+ struct tty_struct *tty;
+
+ tty = info->tty;
+ if (!tty)
+ return;
+
+ tty_hangup(tty);
+}
+
+
+static int startup(struct sgi_serial * info)
+{
+ volatile unsigned char junk;
+ unsigned long flags;
+
+ if (info->flags & ZILOG_INITIALIZED)
+ return 0;
+
+ if (!info->xmit_buf) {
+ info->xmit_buf = (unsigned char *) get_free_page(GFP_KERNEL);
+ if (!info->xmit_buf)
+ return -ENOMEM;
+ }
+
+ save_flags(flags); cli();
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("starting up ttys%d (irq %d)...\n", info->line, info->irq);
+#endif
+
+ /*
+ * Clear the FIFO buffers and disable them
+ * (they will be reenabled in change_speed())
+ */
+ ZS_CLEARFIFO(info->zs_channel);
+ info->xmit_fifo_size = 1;
+
+ /*
+ * Clear the interrupt registers.
+ */
+ udelay(2);
+ info->zs_channel->control = ERR_RES;
+ junk = sgint->istat0;
+ udelay(2);
+ info->zs_channel->control = RES_H_IUS;
+ junk = sgint->istat0;
+
+ /*
+ * Now, initialize the Zilog
+ */
+ zs_rtsdtr(info, 1);
+
+ /*
+ * Finally, enable sequencing and interrupts
+ */
+ info->curregs[1] |= (info->curregs[1] & ~0x18) | (EXT_INT_ENAB|INT_ALL_Rx);
+ info->curregs[3] |= (RxENABLE | Rx8);
+ /* We enable Tx interrupts as needed. */
+ info->curregs[5] |= (TxENAB | Tx8);
+ info->curregs[9] |= (NV | MIE);
+ write_zsreg(info->zs_channel, 3, info->curregs[3]);
+ write_zsreg(info->zs_channel, 5, info->curregs[5]);
+ write_zsreg(info->zs_channel, 9, info->curregs[9]);
+
+ /*
+ * And clear the interrupt registers again for luck.
+ */
+ udelay(2);
+ info->zs_channel->control = ERR_RES;
+ junk = sgint->istat0;
+ udelay(2);
+ info->zs_channel->control = RES_H_IUS;
+ junk = sgint->istat0;
+
+ if (info->tty)
+ clear_bit(TTY_IO_ERROR, &info->tty->flags);
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+ /*
+ * and set the speed of the serial port
+ */
+ change_speed(info);
+
+ info->flags |= ZILOG_INITIALIZED;
+ restore_flags(flags);
+ return 0;
+}
+
+/*
+ * This routine will shutdown a serial port; interrupts are disabled, and
+ * DTR is dropped if the hangup on close termio flag is on.
+ */
+static void shutdown(struct sgi_serial * info)
+{
+ unsigned long flags;
+
+ if (!(info->flags & ZILOG_INITIALIZED))
+ return;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("Shutting down serial port %d (irq %d)....", info->line,
+ info->irq);
+#endif
+
+ save_flags(flags); cli(); /* Disable interrupts */
+
+ if (info->xmit_buf) {
+ free_page((unsigned long) info->xmit_buf);
+ info->xmit_buf = 0;
+ }
+
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+ info->flags &= ~ZILOG_INITIALIZED;
+ restore_flags(flags);
+}
+
+/*
+ * This routine is called to set the UART divisor registers to match
+ * the specified baud rate for a serial port.
+ */
+static void change_speed(struct sgi_serial *info)
+{
+ unsigned int port, cflag;
+ int i;
+ int brg;
+
+ if (!info->tty || !info->tty->termios)
+ return;
+ cflag = info->tty->termios->c_cflag;
+ if (!(port = info->port))
+ return;
+ i = cflag & CBAUD;
+ if (i & CBAUDEX) {
+ /* XXX CBAUDEX is not obeyed.
+ * It is impossible at a 32bits SPARC.
+ * But we have to report this to user ... someday.
+ */
+ i = B9600;
+ }
+ if (i == 0) {
+ /* XXX B0, hangup the line. */
+ do_serial_hangup(info);
+ } else if (baud_table[i]) {
+ info->zs_baud = baud_table[i];
+ info->clk_divisor = 16;
+
+ info->curregs[4] = X16CLK;
+ info->curregs[11] = TCBR | RCBR;
+ brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor);
+ info->curregs[12] = (brg & 255);
+ info->curregs[13] = ((brg >> 8) & 255);
+ info->curregs[14] = BRENABL;
+ }
+
+ /* byte size and parity */
+ switch (cflag & CSIZE) {
+ case CS5:
+ info->curregs[3] &= ~(0xc0);
+ info->curregs[3] |= Rx5;
+ info->curregs[5] &= ~(0xe0);
+ info->curregs[5] |= Tx5;
+ break;
+ case CS6:
+ info->curregs[3] &= ~(0xc0);
+ info->curregs[3] |= Rx6;
+ info->curregs[5] &= ~(0xe0);
+ info->curregs[5] |= Tx6;
+ break;
+ case CS7:
+ info->curregs[3] &= ~(0xc0);
+ info->curregs[3] |= Rx7;
+ info->curregs[5] &= ~(0xe0);
+ info->curregs[5] |= Tx7;
+ break;
+ case CS8:
+ default: /* defaults to 8 bits */
+ info->curregs[3] &= ~(0xc0);
+ info->curregs[3] |= Rx8;
+ info->curregs[5] &= ~(0xe0);
+ info->curregs[5] |= Tx8;
+ break;
+ }
+ info->curregs[4] &= ~(0x0c);
+ if (cflag & CSTOPB)
+ info->curregs[4] |= SB2;
+ else
+ info->curregs[4] |= SB1;
+
+ if (cflag & PARENB)
+ info->curregs[4] |= PAR_ENA;
+ else
+ info->curregs[4] &= ~PAR_ENA;
+
+ if (!(cflag & PARODD))
+ info->curregs[4] |= PAR_EVEN;
+ else
+ info->curregs[4] &= ~PAR_EVEN;
+
+ /* Load up the new values */
+ load_zsregs(info->zs_channel, info->curregs);
+
+ return;
+}
+
+/* This is for console output over ttya/ttyb */
+static void zs_cons_put_char(char ch)
+{
+ struct sgi_zschannel *chan = zs_conschan;
+ volatile unsigned char junk;
+ unsigned long flags;
+ int loops = 0;
+
+ save_flags(flags); cli();
+ while(((junk = chan->control) & Tx_BUF_EMP)==0 && loops < 10000) {
+ loops++;
+ udelay(2);
+ }
+
+ udelay(2);
+ chan->data = ch;
+ junk = sgint->istat0;
+ restore_flags(flags);
+}
+
+/*
+ * This is the more generic put_char function for the driver.
+ * In earlier versions of this driver, "rs_put_char" was the
+ * name of the console-specific fucntion, now called zs_cons_put_char
+ */
+
+static void rs_put_char(struct tty_struct *tty, char ch)
+{
+ struct sgi_zschannel *chan =
+ ((struct sgi_serial *)tty->driver_data)->zs_channel;
+ volatile unsigned char junk;
+ unsigned long flags;
+ int loops = 0;
+
+ save_flags(flags); cli();
+ while(((junk = chan->control) & Tx_BUF_EMP)==0 && loops < 10000) {
+ loops++;
+ udelay(2);
+ }
+
+ udelay(2);
+ chan->data = ch;
+ junk = sgint->istat0;
+ restore_flags(flags);
+}
+
+/* These are for receiving and sending characters under the kgdb
+ * source level kernel debugger.
+ */
+int putDebugChar(char kgdb_char)
+{
+ struct sgi_zschannel *chan = zs_kgdbchan;
+ volatile unsigned char junk;
+ unsigned long flags;
+
+ save_flags(flags); cli();
+ udelay(2);
+ while((chan->control & Tx_BUF_EMP)==0)
+ udelay(2);
+
+ udelay(2);
+ chan->data = kgdb_char;
+ junk = sgint->istat0;
+ restore_flags(flags);
+
+ return 1;
+}
+
+char getDebugChar(void)
+{
+ struct sgi_zschannel *chan = zs_kgdbchan;
+ unsigned char junk;
+
+ while((chan->control & Rx_CH_AV)==0)
+ udelay(2);
+
+ junk = sgint->istat0;
+ udelay(2);
+ return chan->data;
+}
+
+/*
+ * Fair output driver allows a process to speak.
+ */
+static void rs_fair_output(void)
+{
+ int left; /* Output no more than that */
+ unsigned long flags;
+ struct sgi_serial *info = zs_consinfo;
+ volatile unsigned char junk;
+ char c;
+
+ if (info == 0) return;
+ if (info->xmit_buf == 0) return;
+
+ save_flags(flags); cli();
+ left = info->xmit_cnt;
+ while (left != 0) {
+ c = info->xmit_buf[info->xmit_tail];
+ info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
+ info->xmit_cnt--;
+ restore_flags(flags);
+
+ zs_cons_put_char(c);
+
+ save_flags(flags); cli();
+ left = min(info->xmit_cnt, left-1);
+ }
+
+ /* Last character is being transmitted now (hopefully). */
+ udelay(2);
+ zs_conschan->control = RES_Tx_P;
+ junk = sgint->istat0;
+
+ restore_flags(flags);
+ return;
+}
+
+
+static int rs_write(struct tty_struct * tty, int from_user,
+ const unsigned char *buf, int count)
+{
+ int c, total = 0;
+ struct sgi_serial *info = (struct sgi_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_write"))
+ return 0;
+
+ if (!tty || !info->xmit_buf)
+ return 0;
+
+ save_flags(flags);
+ while (1) {
+ cli();
+ c = min(count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+ SERIAL_XMIT_SIZE - info->xmit_head));
+ if (c <= 0)
+ break;
+
+ if (from_user) {
+ down(&tmp_buf_sem);
+ copy_from_user(tmp_buf, buf, c);
+ c = min(c, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+ SERIAL_XMIT_SIZE - info->xmit_head));
+ memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
+ up(&tmp_buf_sem);
+ } else
+ memcpy(info->xmit_buf + info->xmit_head, buf, c);
+ info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
+ info->xmit_cnt += c;
+ restore_flags(flags);
+ buf += c;
+ count -= c;
+ total += c;
+ }
+
+ if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
+ /*
+ * The above test used to include the condition
+ * "&& !(info->curregs[5] & TxENAB)", but there
+ * is reason to suspect that it is never statisfied
+ * when the port is running. The problem may in fact
+ * have been masked by the fact that, if O_POST is set,
+ * there is always a rs_flush_xx operation following the
+ * rs_write, and the flush ignores that condition when
+ * it kicks off the transmit.
+ */
+ /* Enable transmitter */
+ info->curregs[1] |= TxINT_ENAB|EXT_INT_ENAB;
+ write_zsreg(info->zs_channel, 1, info->curregs[1]);
+ info->curregs[5] |= TxENAB;
+ write_zsreg(info->zs_channel, 5, info->curregs[5]);
+
+ /*
+ * The following code is imported from the 2.3.6 Sun sbus zs.c
+ * driver, of which an earlier version served as the basis
+ * for sgiserial.c. Perhaps due to changes over time in
+ * the line discipline code, ns_write()s with from_user
+ * set would not otherwise actually kick-off output in
+ * Linux 2.2.x or later. Maybe it never really worked.
+ */
+
+ rs_put_char(tty, info->xmit_buf[info->xmit_tail++]);
+ info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+ info->xmit_cnt--;
+ }
+
+ restore_flags(flags);
+ return total;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+ struct sgi_serial *info = (struct sgi_serial *)tty->driver_data;
+ int ret;
+
+ if (serial_paranoia_check(info, tty->device, "rs_write_room"))
+ return 0;
+ ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
+ if (ret < 0)
+ ret = 0;
+ return ret;
+}
+
+static int rs_chars_in_buffer(struct tty_struct *tty)
+{
+ struct sgi_serial *info = (struct sgi_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
+ return 0;
+ return info->xmit_cnt;
+}
+
+static void rs_flush_buffer(struct tty_struct *tty)
+{
+ struct sgi_serial *info = (struct sgi_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
+ return;
+ cli();
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+ sti();
+ wake_up_interruptible(&tty->write_wait);
+ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+ tty->ldisc.write_wakeup)
+ (tty->ldisc.write_wakeup)(tty);
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+ struct sgi_serial *info = (struct sgi_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
+ return;
+
+ if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
+ !info->xmit_buf)
+ return;
+
+ /* Enable transmitter */
+ save_flags(flags); cli();
+ info->curregs[1] |= TxINT_ENAB|EXT_INT_ENAB;
+ write_zsreg(info->zs_channel, 1, info->curregs[1]);
+ info->curregs[5] |= TxENAB;
+ write_zsreg(info->zs_channel, 5, info->curregs[5]);
+
+ /*
+ * Send a first (bootstrapping) character. A best solution is
+ * to call transmit_chars() here which handles output in a
+ * generic way. Current transmit_chars() not only transmits,
+ * but resets interrupts also what we do not desire here.
+ * XXX Discuss with David.
+ */
+ if (info->zs_channel->control & Tx_BUF_EMP) {
+ volatile unsigned char junk;
+
+ /* Send char */
+ udelay(2);
+ info->zs_channel->data = info->xmit_buf[info->xmit_tail++];
+ junk = sgint->istat0;
+ info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+ info->xmit_cnt--;
+ }
+ restore_flags(flags);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_throttle()
+ *
+ * This routine is called by the upper-layer tty layer to signal that
+ * incoming characters should be throttled.
+ * ------------------------------------------------------------
+ */
+static void rs_throttle(struct tty_struct * tty)
+{
+ struct sgi_serial *info = (struct sgi_serial *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("throttle %s: %d....\n", _tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (serial_paranoia_check(info, tty->device, "rs_throttle"))
+ return;
+
+ if (I_IXOFF(tty))
+ info->x_char = STOP_CHAR(tty);
+
+ /* Turn off RTS line */
+ cli();
+ info->curregs[5] &= ~RTS;
+ write_zsreg(info->zs_channel, 5, info->curregs[5]);
+ sti();
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+ struct sgi_serial *info = (struct sgi_serial *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
+ tty->ldisc.chars_in_buffer(tty));
+#endif
+
+ if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
+ return;
+
+ if (I_IXOFF(tty)) {
+ if (info->x_char)
+ info->x_char = 0;
+ else
+ info->x_char = START_CHAR(tty);
+ }
+
+ /* Assert RTS line */
+ cli();
+ info->curregs[5] |= RTS;
+ write_zsreg(info->zs_channel, 5, info->curregs[5]);
+ sti();
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct sgi_serial * info,
+ struct serial_struct * retinfo)
+{
+ struct serial_struct tmp;
+
+ if (!retinfo)
+ return -EFAULT;
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.type = info->type;
+ tmp.line = info->line;
+ tmp.port = info->port;
+ tmp.irq = info->irq;
+ tmp.flags = info->flags;
+ tmp.baud_base = info->baud_base;
+ tmp.close_delay = info->close_delay;
+ tmp.closing_wait = info->closing_wait;
+ tmp.custom_divisor = info->custom_divisor;
+ return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
+}
+
+static int set_serial_info(struct sgi_serial * info,
+ struct serial_struct * new_info)
+{
+ struct serial_struct new_serial;
+ struct sgi_serial old_info;
+ int retval = 0;
+
+ if (!new_info)
+ return -EFAULT;
+ copy_from_user(&new_serial,new_info,sizeof(new_serial));
+ old_info = *info;
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ if ((new_serial.baud_base != info->baud_base) ||
+ (new_serial.type != info->type) ||
+ (new_serial.close_delay != info->close_delay) ||
+ ((new_serial.flags & ~ZILOG_USR_MASK) !=
+ (info->flags & ~ZILOG_USR_MASK)))
+ return -EPERM;
+ info->flags = ((info->flags & ~ZILOG_USR_MASK) |
+ (new_serial.flags & ZILOG_USR_MASK));
+ info->custom_divisor = new_serial.custom_divisor;
+ goto check_and_exit;
+ }
+
+ if (info->count > 1)
+ return -EBUSY;
+
+ /*
+ * OK, past this point, all the error checking has been done.
+ * At this point, we start making changes.....
+ */
+
+ info->baud_base = new_serial.baud_base;
+ info->flags = ((info->flags & ~ZILOG_FLAGS) |
+ (new_serial.flags & ZILOG_FLAGS));
+ info->type = new_serial.type;
+ info->close_delay = new_serial.close_delay;
+ info->closing_wait = new_serial.closing_wait;
+
+check_and_exit:
+ retval = startup(info);
+ return retval;
+}
+
+/*
+ * get_lsr_info - get line status register info
+ *
+ * Purpose: Let user call ioctl() to get info when the UART physically
+ * is emptied. On bus types like RS485, the transmitter must
+ * release the bus after transmitting. This must be done when
+ * the transmit shift register is empty, not be done when the
+ * transmit holding register is empty. This functionality
+ * allows an RS485 driver to be written in user space.
+ */
+static int get_lsr_info(struct sgi_serial * info, unsigned int *value)
+{
+ volatile unsigned char junk;
+ unsigned char status;
+
+ cli();
+ udelay(2);
+ status = info->zs_channel->control;
+ junk = sgint->istat0;
+ sti();
+ return put_user(status,value);
+}
+
+static int get_modem_info(struct sgi_serial * info, unsigned int *value)
+{
+ unsigned char status;
+ unsigned int result;
+
+ cli();
+ status = info->zs_channel->control;
+ udelay(2);
+ sti();
+ result = ((info->curregs[5] & RTS) ? TIOCM_RTS : 0)
+ | ((info->curregs[5] & DTR) ? TIOCM_DTR : 0)
+ | ((status & DCD) ? TIOCM_CAR : 0)
+ | ((status & SYNC) ? TIOCM_DSR : 0)
+ | ((status & CTS) ? TIOCM_CTS : 0);
+ if (put_user(result, value))
+ return -EFAULT;
+ return 0;
+}
+
+static int set_modem_info(struct sgi_serial * info, unsigned int cmd,
+ unsigned int *value)
+{
+ unsigned int arg;
+
+ if (get_user(arg, value))
+ return -EFAULT;
+ switch (cmd) {
+ case TIOCMBIS:
+ if (arg & TIOCM_RTS)
+ info->curregs[5] |= RTS;
+ if (arg & TIOCM_DTR)
+ info->curregs[5] |= DTR;
+ break;
+ case TIOCMBIC:
+ if (arg & TIOCM_RTS)
+ info->curregs[5] &= ~RTS;
+ if (arg & TIOCM_DTR)
+ info->curregs[5] &= ~DTR;
+ break;
+ case TIOCMSET:
+ info->curregs[5] = ((info->curregs[5] & ~(RTS | DTR))
+ | ((arg & TIOCM_RTS) ? RTS : 0)
+ | ((arg & TIOCM_DTR) ? DTR : 0));
+ break;
+ default:
+ return -EINVAL;
+ }
+ cli();
+ write_zsreg(info->zs_channel, 5, info->curregs[5]);
+ sti();
+ return 0;
+}
+
+/*
+ * This routine sends a break character out the serial port.
+ */
+static void send_break( struct sgi_serial * info, int duration)
+{
+ if (!info->port)
+ return;
+ current->state = TASK_INTERRUPTIBLE;
+ cli();
+ write_zsreg(info->zs_channel, 5, (info->curregs[5] | SND_BRK));
+ schedule_timeout(duration);
+ write_zsreg(info->zs_channel, 5, info->curregs[5]);
+ sti();
+}
+
+static int rs_ioctl(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct sgi_serial * info = (struct sgi_serial *) tty->driver_data;
+ int retval;
+
+ if (serial_paranoia_check(info, tty->device, "zs_ioctl"))
+ return -ENODEV;
+
+ if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+ (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
+ (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+ }
+
+ switch (cmd) {
+ case TCSBRK: /* SVID version: non-zero arg --> no break */
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
+ tty_wait_until_sent(tty, 0);
+ if (!arg)
+ send_break(info, HZ/4); /* 1/4 second */
+ return 0;
+ case TCSBRKP: /* support for POSIX tcsendbreak() */
+ retval = tty_check_change(tty);
+ if (retval)
+ return retval;
+ tty_wait_until_sent(tty, 0);
+ send_break(info, arg ? arg*(HZ/10) : HZ/4);
+ return 0;
+ case TIOCGSOFTCAR:
+ if (put_user(C_CLOCAL(tty) ? 1 : 0,
+ (unsigned long *) arg))
+ return -EFAULT;
+ return 0;
+ case TIOCSSOFTCAR:
+ if (get_user(arg, (unsigned long *) arg))
+ return -EFAULT;
+ tty->termios->c_cflag =
+ ((tty->termios->c_cflag & ~CLOCAL) |
+ (arg ? CLOCAL : 0));
+ return 0;
+ case TIOCMGET:
+ return get_modem_info(info, (unsigned int *) arg);
+ case TIOCMBIS:
+ case TIOCMBIC:
+ case TIOCMSET:
+ return set_modem_info(info, cmd, (unsigned int *) arg);
+ case TIOCGSERIAL:
+ return get_serial_info(info,
+ (struct serial_struct *) arg);
+ case TIOCSSERIAL:
+ return set_serial_info(info,
+ (struct serial_struct *) arg);
+ case TIOCSERGETLSR: /* Get line status register */
+ return get_lsr_info(info, (unsigned int *) arg);
+
+ case TIOCSERGSTRUCT:
+ if (copy_to_user((struct sgi_serial *) arg,
+ info, sizeof(struct sgi_serial)))
+ return -EFAULT;
+ return 0;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{
+ struct sgi_serial *info = (struct sgi_serial *)tty->driver_data;
+
+ if (tty->termios->c_cflag == old_termios->c_cflag)
+ return;
+
+ change_speed(info);
+
+ if ((old_termios->c_cflag & CRTSCTS) &&
+ !(tty->termios->c_cflag & CRTSCTS)) {
+ tty->hw_stopped = 0;
+ rs_start(tty);
+ }
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_close()
+ *
+ * This routine is called when the serial port gets closed. First, we
+ * wait for the last remaining data to be sent. Then, we unlink its
+ * ZILOG structure from the interrupt chain if necessary, and we free
+ * that IRQ if nothing is left in the chain.
+ * ------------------------------------------------------------
+ */
+static void rs_close(struct tty_struct *tty, struct file * filp)
+{
+ struct sgi_serial * info = (struct sgi_serial *)tty->driver_data;
+ unsigned long flags;
+
+ if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
+ return;
+
+ save_flags(flags); cli();
+
+ if (tty_hung_up_p(filp)) {
+ restore_flags(flags);
+ return;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_close ttys%d, count = %d\n", info->line, info->count);
+#endif
+ if ((tty->count == 1) && (info->count != 1)) {
+ /*
+ * Uh, oh. tty->count is 1, which means that the tty
+ * structure will be freed. Info->count should always
+ * be one in these conditions. If it's greater than
+ * one, we've got real problems, since it means the
+ * serial port won't be shutdown.
+ */
+ printk("rs_close: bad serial port count; tty->count is 1, "
+ "info->count is %d\n", info->count);
+ info->count = 1;
+ }
+ if (--info->count < 0) {
+ printk("rs_close: bad serial port count for ttys%d: %d\n",
+ info->line, info->count);
+ info->count = 0;
+ }
+ if (info->count) {
+ restore_flags(flags);
+ return;
+ }
+ info->flags |= ZILOG_CLOSING;
+ /*
+ * Save the termios structure, since this port may have
+ * separate termios for callout and dialin.
+ */
+ if (info->flags & ZILOG_NORMAL_ACTIVE)
+ info->normal_termios = *tty->termios;
+ if (info->flags & ZILOG_CALLOUT_ACTIVE)
+ info->callout_termios = *tty->termios;
+ /*
+ * Now we wait for the transmit buffer to clear; and we notify
+ * the line discipline to only process XON/XOFF characters.
+ */
+ tty->closing = 1;
+ if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE)
+ tty_wait_until_sent(tty, info->closing_wait);
+ /*
+ * At this point we stop accepting input. To do this, we
+ * disable the receive line status interrupts, and tell the
+ * interrupt driver to stop checking the data ready bit in the
+ * line status register.
+ */
+ /** if (!info->iscons) ... **/
+ info->curregs[3] &= ~RxENABLE;
+ write_zsreg(info->zs_channel, 3, info->curregs[3]);
+ info->curregs[1] &= ~(0x18);
+ write_zsreg(info->zs_channel, 1, info->curregs[1]);
+ ZS_CLEARFIFO(info->zs_channel);
+
+ shutdown(info);
+ if (tty->driver.flush_buffer)
+ tty->driver.flush_buffer(tty);
+ if (tty->ldisc.flush_buffer)
+ tty->ldisc.flush_buffer(tty);
+ tty->closing = 0;
+ info->event = 0;
+ info->tty = 0;
+ if (tty->ldisc.num != ldiscs[N_TTY].num) {
+ if (tty->ldisc.close)
+ (tty->ldisc.close)(tty);
+ tty->ldisc = ldiscs[N_TTY];
+ tty->termios->c_line = N_TTY;
+ if (tty->ldisc.open)
+ (tty->ldisc.open)(tty);
+ }
+ if (info->blocked_open) {
+ if (info->close_delay) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(info->close_delay);
+ }
+ wake_up_interruptible(&info->open_wait);
+ }
+ info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE|
+ ZILOG_CLOSING);
+ wake_up_interruptible(&info->close_wait);
+ restore_flags(flags);
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+void rs_hangup(struct tty_struct *tty)
+{
+ struct sgi_serial * info = (struct sgi_serial *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->device, "rs_hangup"))
+ return;
+
+ rs_flush_buffer(tty);
+ shutdown(info);
+ info->event = 0;
+ info->count = 0;
+ info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE);
+ info->tty = 0;
+ wake_up_interruptible(&info->open_wait);
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_open() and friends
+ * ------------------------------------------------------------
+ */
+static int block_til_ready(struct tty_struct *tty, struct file * filp,
+ struct sgi_serial *info)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ int retval;
+ int do_clocal = 0;
+
+ /*
+ * If the device is in the middle of being closed, then block
+ * until it's done, and then try again.
+ */
+ if (info->flags & ZILOG_CLOSING) {
+ interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ZILOG_HUP_NOTIFY)
+ return -EAGAIN;
+ else
+ return -ERESTARTSYS;
+#else
+ return -EAGAIN;
+#endif
+ }
+
+ /*
+ * If this is a callout device, then just make sure the normal
+ * device isn't being used.
+ */
+ if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
+ if (info->flags & ZILOG_NORMAL_ACTIVE)
+ return -EBUSY;
+ if ((info->flags & ZILOG_CALLOUT_ACTIVE) &&
+ (info->flags & ZILOG_SESSION_LOCKOUT) &&
+ (info->session != current->session))
+ return -EBUSY;
+ if ((info->flags & ZILOG_CALLOUT_ACTIVE) &&
+ (info->flags & ZILOG_PGRP_LOCKOUT) &&
+ (info->pgrp != current->pgrp))
+ return -EBUSY;
+ info->flags |= ZILOG_CALLOUT_ACTIVE;
+ return 0;
+ }
+
+ /*
+ * If non-blocking mode is set, or the port is not enabled,
+ * then make the check up front and then exit.
+ */
+ if ((filp->f_flags & O_NONBLOCK) ||
+ (tty->flags & (1 << TTY_IO_ERROR))) {
+ if (info->flags & ZILOG_CALLOUT_ACTIVE)
+ return -EBUSY;
+ info->flags |= ZILOG_NORMAL_ACTIVE;
+ return 0;
+ }
+
+ if (info->flags & ZILOG_CALLOUT_ACTIVE) {
+ if (info->normal_termios.c_cflag & CLOCAL)
+ do_clocal = 1;
+ } else {
+ if (tty->termios->c_cflag & CLOCAL)
+ do_clocal = 1;
+ }
+
+ /*
+ * Block waiting for the carrier detect and the line to become
+ * free (i.e., not in use by the callout). While we are in
+ * this loop, info->count is dropped by one, so that
+ * rs_close() knows when to free things. We restore it upon
+ * exit, either normal or abnormal.
+ */
+ retval = 0;
+ add_wait_queue(&info->open_wait, &wait);
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready before block: ttys%d, count = %d\n",
+ info->line, info->count);
+#endif
+ info->count--;
+ info->blocked_open++;
+ while (1) {
+ cli();
+ if (!(info->flags & ZILOG_CALLOUT_ACTIVE))
+ zs_rtsdtr(info, 1);
+ sti();
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (tty_hung_up_p(filp) ||
+ !(info->flags & ZILOG_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ZILOG_HUP_NOTIFY)
+ retval = -EAGAIN;
+ else
+ retval = -ERESTARTSYS;
+#else
+ retval = -EAGAIN;
+#endif
+ break;
+ }
+ if (!(info->flags & ZILOG_CALLOUT_ACTIVE) &&
+ !(info->flags & ZILOG_CLOSING) && do_clocal)
+ break;
+ if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ break;
+ }
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready blocking: ttys%d, count = %d\n",
+ info->line, info->count);
+#endif
+ schedule();
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&info->open_wait, &wait);
+ if (!tty_hung_up_p(filp))
+ info->count++;
+ info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+ printk("block_til_ready after blocking: ttys%d, count = %d\n",
+ info->line, info->count);
+#endif
+ if (retval)
+ return retval;
+ info->flags |= ZILOG_NORMAL_ACTIVE;
+ return 0;
+}
+
+/*
+ * This routine is called whenever a serial port is opened. It
+ * enables interrupts for a serial port, linking in its ZILOG structure into
+ * the IRQ chain. It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+int rs_open(struct tty_struct *tty, struct file * filp)
+{
+ struct sgi_serial *info;
+ int retval, line;
+
+ line = MINOR(tty->device) - tty->driver.minor_start;
+ /* The zilog lines for the mouse/keyboard must be
+ * opened using their respective drivers.
+ */
+ if ((line < 0) || (line >= NUM_CHANNELS))
+ return -ENODEV;
+ info = zs_soft + line;
+ /* Is the kgdb running over this line? */
+ if (info->kgdb_channel)
+ return -ENODEV;
+ if (serial_paranoia_check(info, tty->device, "rs_open"))
+ return -ENODEV;
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
+ info->count);
+#endif
+ info->count++;
+ tty->driver_data = info;
+ info->tty = tty;
+
+ /*
+ * Start up serial port
+ */
+ retval = startup(info);
+ if (retval)
+ return retval;
+
+ retval = block_til_ready(tty, filp, info);
+ if (retval) {
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open returning after block_til_ready with %d\n",
+ retval);
+#endif
+ return retval;
+ }
+
+ if ((info->count == 1) && (info->flags & ZILOG_SPLIT_TERMIOS)) {
+ if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
+ *tty->termios = info->normal_termios;
+ else
+ *tty->termios = info->callout_termios;
+ change_speed(info);
+ }
+
+ /* If this is the serial console change the speed to
+ * the right value
+ */
+ if (info->is_cons) {
+ info->tty->termios->c_cflag = sgisercon->cflag;
+ change_speed(info);
+ }
+
+ info->session = current->session;
+ info->pgrp = current->pgrp;
+
+#ifdef SERIAL_DEBUG_OPEN
+ printk("rs_open ttys%d successful...\n", info->line);
+#endif
+ return 0;
+}
+
+/* Finally, routines used to initialize the serial driver. */
+
+static void show_serial_version(void)
+{
+ printk("SGI Zilog8530 serial driver version 1.00\n");
+}
+
+/* Return layout for the requested zs chip number. */
+static inline struct sgi_zslayout *get_zs(int chip)
+{
+ if (chip > 0)
+ panic("Wheee, bogus zs chip number requested.");
+
+ return (struct sgi_zslayout *) (&sgioc->serport);
+}
+
+
+static inline void
+rs_cons_check(struct sgi_serial *ss, int channel)
+{
+ int i, o, io;
+ static int msg_printed = 0;
+
+ i = o = io = 0;
+
+ /* Is this one of the serial console lines? */
+ if((zs_cons_chanout != channel) &&
+ (zs_cons_chanin != channel))
+ return;
+ zs_conschan = ss->zs_channel;
+ zs_consinfo = ss;
+
+
+
+ /* If this is console input, we handle the break received
+ * status interrupt on this line to mean prom_halt().
+ */
+ if(zs_cons_chanin == channel) {
+ ss->break_abort = 1;
+ i = 1;
+ }
+ if(o && i)
+ io = 1;
+
+ /* Set flag variable for this port so that it cannot be
+ * opened for other uses by accident.
+ */
+ ss->is_cons = 1;
+
+ if(io) {
+ if (!msg_printed) {
+ printk("zs%d: console I/O\n", ((channel>>1)&1));
+ msg_printed = 1;
+ }
+
+ } else {
+ printk("zs%d: console %s\n", ((channel>>1)&1),
+ (i==1 ? "input" : (o==1 ? "output" : "WEIRD")));
+ }
+}
+
+/* rs_init inits the driver */
+int rs_init(void)
+{
+ unsigned long flags;
+ int chip, channel, i;
+ struct sgi_serial *info;
+
+
+ /* Setup base handler, and timer table. */
+ init_bh(SERIAL_BH, do_serial_bh);
+
+ show_serial_version();
+
+ /* Initialize the tty_driver structure */
+ /* SGI: Not all of this is exactly right for us. */
+
+ memset(&serial_driver, 0, sizeof(struct tty_driver));
+ serial_driver.magic = TTY_DRIVER_MAGIC;
+#ifdef CONFIG_DEVFS_FS
+ serial_driver.name = "tts/%d";
+#else
+ serial_driver.name = "ttyS";
+#endif
+ serial_driver.major = TTY_MAJOR;
+ serial_driver.minor_start = 64;
+ serial_driver.num = NUM_CHANNELS;
+ serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
+ serial_driver.subtype = SERIAL_TYPE_NORMAL;
+ serial_driver.init_termios = tty_std_termios;
+
+ serial_driver.init_termios.c_cflag =
+ B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ serial_driver.flags = TTY_DRIVER_REAL_RAW;
+ serial_driver.refcount = &serial_refcount;
+ serial_driver.table = serial_table;
+ serial_driver.termios = serial_termios;
+ serial_driver.termios_locked = serial_termios_locked;
+
+ serial_driver.open = rs_open;
+ serial_driver.close = rs_close;
+ serial_driver.write = rs_write;
+ serial_driver.flush_chars = rs_flush_chars;
+ serial_driver.write_room = rs_write_room;
+ serial_driver.chars_in_buffer = rs_chars_in_buffer;
+ serial_driver.flush_buffer = rs_flush_buffer;
+ serial_driver.ioctl = rs_ioctl;
+ serial_driver.throttle = rs_throttle;
+ serial_driver.unthrottle = rs_unthrottle;
+ serial_driver.set_termios = rs_set_termios;
+ serial_driver.stop = rs_stop;
+ serial_driver.start = rs_start;
+ serial_driver.hangup = rs_hangup;
+
+ /*
+ * The callout device is just like normal device except for
+ * major number and the subtype code.
+ */
+ callout_driver = serial_driver;
+#ifdef CONFIG_DEVFS_FS
+ callout_driver.name = "cua/%d";
+#else
+ callout_driver.name = "cua";
+#endif
+ callout_driver.major = TTYAUX_MAJOR;
+ callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+
+ if (tty_register_driver(&serial_driver))
+ panic("Couldn't register serial driver");
+ if (tty_register_driver(&callout_driver))
+ panic("Couldn't register callout driver");
+
+ save_flags(flags); cli();
+
+ /* Set up our interrupt linked list */
+ zs_chain = &zs_soft[0];
+ zs_soft[0].zs_next = &zs_soft[1];
+ zs_soft[1].zs_next = 0;
+
+ for(chip = 0; chip < NUM_SERIAL; chip++) {
+ /* If we are doing kgdb over one of the channels on
+ * chip zero, kgdb_channel will be set to 1 by the
+ * rs_kgdb_hook() routine below.
+ */
+ if(!zs_chips[chip]) {
+ zs_chips[chip] = get_zs(chip);
+ /* Two channels per chip */
+ zs_channels[(chip*2)] = &zs_chips[chip]->channelB;
+ zs_channels[(chip*2)+1] = &zs_chips[chip]->channelA;
+ zs_soft[(chip*2)].kgdb_channel = 0;
+ zs_soft[(chip*2)+1].kgdb_channel = 0;
+ }
+ /* First, set up channel A on this chip. */
+ channel = chip * 2;
+ zs_soft[channel].zs_channel = zs_channels[channel];
+ zs_soft[channel].change_needed = 0;
+ zs_soft[channel].clk_divisor = 16;
+ zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
+ zs_soft[channel].cons_mouse = 0;
+ /* If not keyboard/mouse and is console serial
+ * line, then enable receiver interrupts.
+ */
+ if(zs_soft[channel].is_cons) {
+ write_zsreg(zs_soft[channel].zs_channel, R1,
+ (EXT_INT_ENAB | INT_ALL_Rx));
+ write_zsreg(zs_soft[channel].zs_channel, R9, (NV | MIE));
+ write_zsreg(zs_soft[channel].zs_channel, R10, (NRZ));
+ write_zsreg(zs_soft[channel].zs_channel, R3, (Rx8|RxENABLE));
+ write_zsreg(zs_soft[channel].zs_channel, R5, (Tx8 | TxENAB));
+ }
+ /* If this is the kgdb line, enable interrupts because we
+ * now want to receive the 'control-c' character from the
+ * client attached to us asynchronously.
+ */
+ if(zs_soft[channel].kgdb_channel)
+ kgdb_chaninit(&zs_soft[channel], 1,
+ zs_soft[channel].zs_baud);
+
+ /* Now, channel B */
+ channel++;
+ zs_soft[channel].zs_channel = zs_channels[channel];
+ zs_soft[channel].change_needed = 0;
+ zs_soft[channel].clk_divisor = 16;
+ zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
+ zs_soft[channel].cons_keyb = 0;
+ /* If console serial line, then enable receiver interrupts. */
+ if(zs_soft[channel].is_cons) {
+ write_zsreg(zs_soft[channel].zs_channel, R1,
+ (EXT_INT_ENAB | INT_ALL_Rx));
+ write_zsreg(zs_soft[channel].zs_channel, R9,
+ (NV | MIE));
+ write_zsreg(zs_soft[channel].zs_channel, R10,
+ (NRZ));
+ write_zsreg(zs_soft[channel].zs_channel, R3,
+ (Rx8|RxENABLE));
+ write_zsreg(zs_soft[channel].zs_channel, R5,
+ (Tx8 | TxENAB | RTS | DTR));
+ }
+ }
+
+ for(info=zs_chain, i=0; info; info = info->zs_next, i++)
+ {
+ info->magic = SERIAL_MAGIC;
+ info->port = (int) info->zs_channel;
+ info->line = i;
+ info->tty = 0;
+ info->irq = zilog_irq;
+ info->custom_divisor = 16;
+ info->close_delay = 50;
+ info->closing_wait = 3000;
+ info->x_char = 0;
+ info->event = 0;
+ info->count = 0;
+ info->blocked_open = 0;
+ info->tqueue.routine = do_softint;
+ info->tqueue.data = info;
+ info->tqueue_hangup.routine = do_serial_hangup;
+ info->tqueue_hangup.data = info;
+ info->callout_termios =callout_driver.init_termios;
+ info->normal_termios = serial_driver.init_termios;
+ init_waitqueue_head(&info->open_wait);
+ init_waitqueue_head(&info->close_wait);
+ printk("tty%02d at 0x%04x (irq = %d)", info->line,
+ info->port, info->irq);
+ printk(" is a Zilog8530\n");
+ }
+
+ if (request_irq(zilog_irq, rs_interrupt, (SA_INTERRUPT),
+ "Zilog8530", zs_chain))
+ panic("Unable to attach zs intr");
+ restore_flags(flags);
+
+ return 0;
+}
+
+/*
+ * register_serial and unregister_serial allows for serial ports to be
+ * configured at run-time, to support PCMCIA modems.
+ */
+/* SGI: Unused at this time, just here to make things link. */
+int register_serial(struct serial_struct *req)
+{
+ return -1;
+}
+
+void unregister_serial(int line)
+{
+ return;
+}
+
+/* Hooks for running a serial console. con_init() calls this if the
+ * console is being run over one of the ttya/ttyb serial ports.
+ * 'chip' should be zero, as chip 1 drives the mouse/keyboard.
+ * 'channel' is decoded as 0=TTYA 1=TTYB, note that the channels
+ * are addressed backwards, channel B is first, then channel A.
+ */
+void
+rs_cons_hook(int chip, int out, int line)
+{
+ int channel;
+
+ if(chip)
+ panic("rs_cons_hook called with chip not zero");
+ if(line != 0 && line != 1)
+ panic("rs_cons_hook called with line not ttya or ttyb");
+ channel = line;
+ if(!zs_chips[chip]) {
+ zs_chips[chip] = get_zs(chip);
+ /* Two channels per chip */
+ zs_channels[(chip*2)] = &zs_chips[chip]->channelB;
+ zs_channels[(chip*2)+1] = &zs_chips[chip]->channelA;
+ }
+ zs_soft[channel].zs_channel = zs_channels[channel];
+ zs_soft[channel].change_needed = 0;
+ zs_soft[channel].clk_divisor = 16;
+ zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
+ if(out)
+ zs_cons_chanout = ((chip * 2) + channel);
+ else
+ zs_cons_chanin = ((chip * 2) + channel);
+
+ rs_cons_check(&zs_soft[channel], channel);
+}
+
+/* This is called at boot time to prime the kgdb serial debugging
+ * serial line. The 'tty_num' argument is 0 for /dev/ttyd2 and 1 for
+ * /dev/ttyd1 (yes they are backwards on purpose) which is determined
+ * in setup_arch() from the boot command line flags.
+ */
+void
+rs_kgdb_hook(int tty_num)
+{
+ int chip = 0;
+
+ if(!zs_chips[chip]) {
+ zs_chips[chip] = get_zs(chip);
+ /* Two channels per chip */
+ zs_channels[(chip*2)] = &zs_chips[chip]->channelA;
+ zs_channels[(chip*2)+1] = &zs_chips[chip]->channelB;
+ }
+ zs_soft[tty_num].zs_channel = zs_channels[tty_num];
+ zs_kgdbchan = zs_soft[tty_num].zs_channel;
+ zs_soft[tty_num].change_needed = 0;
+ zs_soft[tty_num].clk_divisor = 16;
+ zs_soft[tty_num].zs_baud = get_zsbaud(&zs_soft[tty_num]);
+ zs_soft[tty_num].kgdb_channel = 1; /* This runs kgdb */
+ zs_soft[tty_num ^ 1].kgdb_channel = 0; /* This does not */
+
+ /* Turn on transmitter/receiver at 8-bits/char */
+ kgdb_chaninit(&zs_soft[tty_num], 0, 9600);
+ ZS_CLEARERR(zs_kgdbchan);
+ udelay(5);
+ ZS_CLEARFIFO(zs_kgdbchan);
+}
+
+static void zs_console_write(struct console *co, const char *str,
+ unsigned int count)
+{
+
+ while(count--) {
+ if(*str == '\n')
+ zs_cons_put_char('\r');
+ zs_cons_put_char(*str++);
+ }
+
+ /* Comment this if you want to have a strict interrupt-driven output */
+ rs_fair_output();
+}
+
+static kdev_t zs_console_device(struct console *con)
+{
+ return MKDEV(TTY_MAJOR, 64 + con->index);
+}
+
+
+static int __init zs_console_setup(struct console *con, char *options)
+{
+ struct sgi_serial *info;
+ int baud;
+ int bits = 8;
+ int parity = 'n';
+ int cflag = CREAD | HUPCL | CLOCAL;
+ char *s, *dbaud;
+ int i, brg;
+
+ if (options) {
+ baud = simple_strtoul(options, NULL, 10);
+ s = options;
+ while(*s >= '0' && *s <= '9')
+ s++;
+ if (*s) parity = *s++;
+ if (*s) bits = *s - '0';
+ }
+ else {
+ /* If the user doesn't set console=... try to read the
+ * PROM variable - if this fails use 9600 baud and
+ * inform the user about the problem
+ */
+ dbaud = ArcGetEnvironmentVariable("dbaud");
+ if(dbaud) baud = simple_strtoul(dbaud, NULL, 10);
+ else {
+ /* Use prom_printf() to make sure that the user
+ * is getting anything ...
+ */
+ prom_printf("No dbaud set in PROM ?!? Using 9600.\n");
+ baud = 9600;
+ }
+ }
+
+ /*
+ * Now construct a cflag setting.
+ */
+ switch(baud) {
+ case 1200:
+ cflag |= B1200;
+ break;
+ case 2400:
+ cflag |= B2400;
+ break;
+ case 4800:
+ cflag |= B4800;
+ break;
+ case 19200:
+ cflag |= B19200;
+ break;
+ case 38400:
+ cflag |= B38400;
+ break;
+ case 57600:
+ cflag |= B57600;
+ break;
+ case 115200:
+ cflag |= B115200;
+ break;
+ case 9600:
+ default:
+ cflag |= B9600;
+ break;
+ }
+ switch(bits) {
+ case 7:
+ cflag |= CS7;
+ break;
+ default:
+ case 8:
+ cflag |= CS8;
+ break;
+ }
+ switch(parity) {
+ case 'o': case 'O':
+ cflag |= PARODD;
+ break;
+ case 'e': case 'E':
+ cflag |= PARENB;
+ break;
+ }
+ con->cflag = cflag;
+
+ rs_cons_hook(0, 0, con->index);
+ info = zs_soft + con->index;
+ info->is_cons = 1;
+
+ printk("Console: ttyS%d (Zilog8530), %d baud\n",
+ info->line, baud);
+
+ i = con->cflag & CBAUD;
+ if (con->cflag & CBAUDEX) {
+ i &= ~CBAUDEX;
+ con->cflag &= ~CBAUDEX;
+ }
+ info->zs_baud = baud;
+
+ switch (con->cflag & CSIZE) {
+ case CS5:
+ zscons_regs[3] = Rx5 | RxENABLE;
+ zscons_regs[5] = Tx5 | TxENAB;
+ break;
+ case CS6:
+ zscons_regs[3] = Rx6 | RxENABLE;
+ zscons_regs[5] = Tx6 | TxENAB;
+ break;
+ case CS7:
+ zscons_regs[3] = Rx7 | RxENABLE;
+ zscons_regs[5] = Tx7 | TxENAB;
+ break;
+ default:
+ case CS8:
+ zscons_regs[3] = Rx8 | RxENABLE;
+ zscons_regs[5] = Tx8 | TxENAB;
+ break;
+ }
+ zscons_regs[5] |= DTR;
+
+ if (con->cflag & PARENB)
+ zscons_regs[4] |= PAR_ENA;
+ if (!(con->cflag & PARODD))
+ zscons_regs[4] |= PAR_EVEN;
+
+ if (con->cflag & CSTOPB)
+ zscons_regs[4] |= SB2;
+ else
+ zscons_regs[4] |= SB1;
+
+ sgisercon = con;
+
+ brg = BPS_TO_BRG(baud, ZS_CLOCK / info->clk_divisor);
+ zscons_regs[12] = brg & 0xff;
+ zscons_regs[13] = (brg >> 8) & 0xff;
+ memcpy(info->curregs, zscons_regs, sizeof(zscons_regs));
+ load_zsregs(info->zs_channel, zscons_regs);
+ ZS_CLEARERR(info->zs_channel);
+ ZS_CLEARFIFO(info->zs_channel);
+ return 0;
+}
+
+static struct console sgi_console_driver = {
+ .name = "ttyS",
+ .write = zs_console_write,
+ .device = zs_console_device,
+ .setup = zs_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+
+/*
+ * Register console.
+ */
+void __init sgi_serial_console_init(void)
+{
+ register_console(&sgi_console_driver);
+}
+__initcall(rs_init);
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)