patch-2.4.22 linux-2.4.22/drivers/char/vac-serial.c
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- Lines: 2906
- Date:
2003-08-25 04:44:41.000000000 -0700
- Orig file:
linux-2.4.21/drivers/char/vac-serial.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.21/drivers/char/vac-serial.c linux-2.4.22/drivers/char/vac-serial.c
@@ -0,0 +1,2905 @@
+/*
+ * vacserial.c: VAC UART serial driver
+ * This code stealed and adopted from linux/drivers/char/serial.c
+ * See that for author info
+ *
+ * Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
+ */
+
+#undef SERIAL_PARANOIA_CHECK
+#define CONFIG_SERIAL_NOPAUSE_IO
+#define SERIAL_DO_RESTART
+
+#define CONFIG_SERIAL_SHARE_IRQ
+
+/* Set of debugging defines */
+
+#undef SERIAL_DEBUG_INTR
+#undef SERIAL_DEBUG_OPEN
+#undef SERIAL_DEBUG_FLOW
+#undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+
+#define RS_STROBE_TIME (10*HZ)
+#define RS_ISR_PASS_LIMIT 2 /* Beget is not a super-computer (old=256) */
+
+#define IRQ_T(state) \
+ ((state->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
+
+#define SERIAL_INLINE
+
+#if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
+#define DBG_CNT(s) baget_printk("(%s):[%x] refc=%d, serc=%d, ttyc=%d-> %s\n", \
+ kdevname(tty->device),(info->flags),serial_refcount,info->count,tty->count,s)
+#else
+#define DBG_CNT(s)
+#endif
+
+#define QUAD_UART_SPEED /* Useful for Baget */
+
+/*
+ * End of serial driver configuration section.
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#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/serial.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/fcntl.h>
+#include <linux/ptrace.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#ifdef CONFIG_SERIAL_CONSOLE
+#include <linux/console.h>
+#endif
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>
+#include <asm/bitops.h>
+#include <asm/serial.h>
+#include <asm/baget/baget.h>
+
+#define BAGET_VAC_UART_IRQ 0x35
+
+/*
+ * Implementation note:
+ * It was descovered by means of advanced electronic tools,
+ * if the driver works via TX_READY interrupts then VIC generates
+ * strange self-eliminating traps. Thus, the driver is rewritten to work
+ * via TX_EMPTY
+ */
+
+/* VAC-specific check/debug switches */
+
+#undef CHECK_REG_INDEX
+#undef DEBUG_IO_PORT_A
+
+#ifdef SERIAL_INLINE
+#define _INLINE_ inline
+#endif
+
+static char *serial_name = "VAC Serial driver";
+static char *serial_version = "4.26";
+
+static DECLARE_TASK_QUEUE(tq_serial);
+
+static struct tty_driver serial_driver, callout_driver;
+static int serial_refcount;
+
+/* number of characters left in xmit buffer before we ask for more */
+#define WAKEUP_CHARS 256
+
+/*
+ * IRQ_timeout - How long the timeout should be for each IRQ
+ * should be after the IRQ has been active.
+ */
+
+static struct async_struct *IRQ_ports[NR_IRQS];
+static int IRQ_timeout[NR_IRQS];
+#ifdef CONFIG_SERIAL_CONSOLE
+static struct console sercons;
+#endif
+
+static void autoconfig(struct serial_state * info);
+static void change_speed(struct async_struct *info);
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
+static void rs_timer(unsigned long dummy);
+
+static struct timer_list vacs_timer;
+
+/*
+ * Here we define the default xmit fifo size used for each type of
+ * UART
+ */
+static struct serial_uart_config uart_config[] = {
+ { "unknown", 1, 0 }, /* Must go first -- used as unasigned */
+ { "VAC UART", 1, 0 }
+};
+#define VAC_UART_TYPE 1 /* Just index in above array */
+
+static struct serial_state rs_table[] = {
+/*
+ * VAC has tricky layout for pair of his SIO registers,
+ * so we need special function to access ones.
+ * To identify port we use their TX offset
+ */
+ { 0, 9600, VAC_UART_B_TX, BAGET_VAC_UART_IRQ,
+ STD_COM_FLAGS }, /* VAC UART B */
+ { 0, 9600, VAC_UART_A_TX, BAGET_VAC_UART_IRQ,
+ STD_COM_FLAGS } /* VAC UART A */
+};
+
+#define NR_PORTS (sizeof(rs_table)/sizeof(struct serial_state))
+
+static struct tty_struct *serial_table[NR_PORTS];
+static struct termios *serial_termios[NR_PORTS];
+static struct termios *serial_termios_locked[NR_PORTS];
+
+#ifndef MIN
+#define MIN(a,b) ((a) < (b) ? (a) : (b))
+#endif
+
+/*
+ * tmp_buf is used as a temporary buffer by serial_write. We need to
+ * lock it in case the copy_from_user 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;
+static DECLARE_MUTEX(tmp_buf_sem);
+
+static inline int serial_paranoia_check(struct async_struct *info,
+ kdev_t device, const char *routine)
+{
+#ifdef SERIAL_PARANOIA_CHECK
+ static const char *badmagic =
+ "Warning: bad magic number for serial struct (%s) in %s\n";
+ static const char *badinfo =
+ "Warning: null async_struct for (%s) in %s\n";
+
+ if (!info) {
+ printk(badinfo, kdevname(device), routine);
+ return 1;
+ }
+ if (info->magic != SERIAL_MAGIC) {
+ printk(badmagic, kdevname(device), routine);
+ return 1;
+ }
+#endif
+ return 0;
+}
+
+/*
+ To unify UART A/B access we will use following function
+ to compute register offsets by register index.
+ */
+
+#define VAC_UART_MODE 0
+#define VAC_UART_TX 1
+#define VAC_UART_RX 2
+#define VAC_UART_INT_MASK 3
+#define VAC_UART_INT_STATUS 4
+
+#define VAC_UART_REG_NR 5
+
+static inline int uart_offset_map(unsigned long port, int reg_index)
+{
+ static const unsigned int ind_to_reg[VAC_UART_REG_NR][NR_PORTS] = {
+ { VAC_UART_B_MODE, VAC_UART_A_MODE },
+ { VAC_UART_B_TX, VAC_UART_A_TX },
+ { VAC_UART_B_RX, VAC_UART_A_RX },
+ { VAC_UART_B_INT_MASK, VAC_UART_A_INT_MASK },
+ { VAC_UART_B_INT_STATUS, VAC_UART_A_INT_STATUS }
+ };
+#ifdef CHECK_REG_INDEX
+ if (reg_index > VAC_UART_REG_NR) panic("vacserial: bad reg_index");
+#endif
+ return ind_to_reg[reg_index][port == VAC_UART_B_TX ? 0 : 1];
+}
+
+static inline unsigned int serial_inw(struct async_struct *info, int offset)
+{
+ int val = vac_inw(uart_offset_map(info->port,offset));
+#ifdef DEBUG_IO_PORT_A
+ if (info->port == VAC_UART_A_TX)
+ printk("UART_A_IN: reg = 0x%04x, val = 0x%04x\n",
+ uart_offset_map(info->port,offset), val);
+#endif
+ return val;
+}
+
+static inline unsigned int serial_inp(struct async_struct *info, int offset)
+{
+ return serial_inw(info, offset);
+}
+
+static inline unsigned int serial_in(struct async_struct *info, int offset)
+{
+ return serial_inw(info, offset);
+}
+
+static inline void serial_outw(struct async_struct *info,int offset, int value)
+{
+#ifdef DEBUG_IO_PORT_A
+ if (info->port == VAC_UART_A_TX)
+ printk("UART_A_OUT: offset = 0x%04x, val = 0x%04x\n",
+ uart_offset_map(info->port,offset), value);
+#endif
+ vac_outw(value, uart_offset_map(info->port,offset));
+}
+
+static inline void serial_outp(struct async_struct *info,int offset, int value)
+{
+ serial_outw(info,offset,value);
+}
+
+static inline void serial_out(struct async_struct *info,int offset, int value)
+{
+ serial_outw(info,offset,value);
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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 async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_stop"))
+ return;
+
+ save_flags(flags); cli();
+ if (info->IER & VAC_UART_INT_TX_EMPTY) {
+ info->IER &= ~VAC_UART_INT_TX_EMPTY;
+ serial_out(info, VAC_UART_INT_MASK, info->IER);
+ }
+ restore_flags(flags);
+}
+
+static void rs_start(struct tty_struct *tty)
+{
+ struct async_struct *info = (struct async_struct *)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->IER & VAC_UART_INT_TX_EMPTY)) {
+ info->IER |= VAC_UART_INT_TX_EMPTY;
+ serial_out(info, VAC_UART_INT_MASK, info->IER);
+ }
+ restore_flags(flags);
+}
+
+/*
+ * ----------------------------------------------------------------------
+ *
+ * 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 async_struct *info,
+ int event)
+{
+ info->event |= 1 << event;
+ queue_task(&info->tqueue, &tq_serial);
+ mark_bh(SERIAL_BH);
+}
+
+static _INLINE_ void receive_chars(struct async_struct *info,
+ int *status)
+{
+ struct tty_struct *tty = info->tty;
+ unsigned short rx;
+ unsigned char ch;
+ int ignored = 0;
+ struct async_icount *icount;
+
+ icount = &info->state->icount;
+ do {
+ rx = serial_inw(info, VAC_UART_RX);
+ ch = VAC_UART_RX_DATA_MASK & rx;
+
+ if (tty->flip.count >= TTY_FLIPBUF_SIZE)
+ break;
+ *tty->flip.char_buf_ptr = ch;
+ icount->rx++;
+
+#ifdef SERIAL_DEBUG_INTR
+ baget_printk("DR%02x:%02x...", rx, *status);
+#endif
+ *tty->flip.flag_buf_ptr = 0;
+ if (*status & (VAC_UART_STATUS_RX_BREAK_CHANGE
+ | VAC_UART_STATUS_RX_ERR_PARITY
+ | VAC_UART_STATUS_RX_ERR_FRAME
+ | VAC_UART_STATUS_RX_ERR_OVERRUN)) {
+ /*
+ * For statistics only
+ */
+ if (*status & VAC_UART_STATUS_RX_BREAK_CHANGE) {
+ *status &= ~(VAC_UART_STATUS_RX_ERR_FRAME
+ | VAC_UART_STATUS_RX_ERR_PARITY);
+ icount->brk++;
+ } else if (*status & VAC_UART_STATUS_RX_ERR_PARITY)
+ icount->parity++;
+ else if (*status & VAC_UART_STATUS_RX_ERR_FRAME)
+ icount->frame++;
+ if (*status & VAC_UART_STATUS_RX_ERR_OVERRUN)
+ icount->overrun++;
+
+ /*
+ * Now check to see if character should be
+ * ignored, and mask off conditions which
+ * should be ignored.
+ */
+ if (*status & info->ignore_status_mask) {
+ if (++ignored > 100)
+ break;
+ goto ignore_char;
+ }
+ *status &= info->read_status_mask;
+
+ if (*status & (VAC_UART_STATUS_RX_BREAK_CHANGE)) {
+#ifdef SERIAL_DEBUG_INTR
+ baget_printk("handling break....");
+#endif
+ *tty->flip.flag_buf_ptr = TTY_BREAK;
+ if (info->flags & ASYNC_SAK)
+ do_SAK(tty);
+ } else if (*status & VAC_UART_STATUS_RX_ERR_PARITY)
+ *tty->flip.flag_buf_ptr = TTY_PARITY;
+ else if (*status & VAC_UART_STATUS_RX_ERR_FRAME)
+ *tty->flip.flag_buf_ptr = TTY_FRAME;
+ if (*status & VAC_UART_STATUS_RX_ERR_OVERRUN) {
+ /*
+ * Overrun is special, since it's
+ * reported immediately, and doesn't
+ * affect the current character
+ */
+ if (tty->flip.count < TTY_FLIPBUF_SIZE) {
+ tty->flip.count++;
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ *tty->flip.flag_buf_ptr = TTY_OVERRUN;
+ }
+ }
+ }
+ tty->flip.flag_buf_ptr++;
+ tty->flip.char_buf_ptr++;
+ tty->flip.count++;
+ ignore_char:
+ *status = serial_inw(info, VAC_UART_INT_STATUS);
+ } while ((*status & VAC_UART_STATUS_RX_READY));
+ tty_flip_buffer_push(tty);
+}
+
+static _INLINE_ void transmit_chars(struct async_struct *info, int *intr_done)
+{
+ int count;
+
+ if (info->x_char) {
+ serial_outw(info, VAC_UART_TX,
+ (((unsigned short)info->x_char)<<8));
+ info->state->icount.tx++;
+ info->x_char = 0;
+ if (intr_done)
+ *intr_done = 0;
+ return;
+ }
+ if ((info->xmit_cnt <= 0) || info->tty->stopped ||
+ info->tty->hw_stopped) {
+ info->IER &= ~VAC_UART_INT_TX_EMPTY;
+ serial_outw(info, VAC_UART_INT_MASK, info->IER);
+ return;
+ }
+ count = info->xmit_fifo_size;
+ do {
+ serial_out(info, VAC_UART_TX,
+ (unsigned short)info->xmit_buf[info->xmit_tail++] \
+ << 8);
+ info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
+ info->state->icount.tx++;
+ if (--info->xmit_cnt <= 0)
+ break;
+ } while (--count > 0);
+
+ if (info->xmit_cnt < WAKEUP_CHARS)
+ rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+
+#ifdef SERIAL_DEBUG_INTR
+ baget_printk("THRE...");
+#endif
+ if (intr_done)
+ *intr_done = 0;
+
+ if (info->xmit_cnt <= 0) {
+ info->IER &= ~VAC_UART_INT_TX_EMPTY;
+ serial_outw(info, VAC_UART_INT_MASK, info->IER);
+ }
+}
+
+static _INLINE_ void check_modem_status(struct async_struct *info)
+{
+#if 0 /* VAC hasn't modem control */
+ wake_up_interruptible(&info->open_wait);
+ rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
+#endif
+}
+
+#ifdef CONFIG_SERIAL_SHARE_IRQ
+
+
+/*
+ * Specific functions needed for VAC UART interrupt enter/leave
+ */
+
+#define VAC_INT_CTRL_UART_ENABLE \
+ (VAC_INT_CTRL_TIMER_PIO10|VAC_INT_CTRL_UART_B_PIO7|VAC_INT_CTRL_UART_A_PIO7)
+
+#define VAC_INT_CTRL_UART_DISABLE(info) \
+ (VAC_INT_CTRL_TIMER_PIO10 | \
+ ((info->port == VAC_UART_A_TX) ? \
+ (VAC_INT_CTRL_UART_A_DISABLE|VAC_INT_CTRL_UART_B_PIO7) : \
+ (VAC_INT_CTRL_UART_A_PIO7|VAC_INT_CTRL_UART_B_DISABLE)))
+
+/*
+ * Following two functions were proposed by Pavel Osipenko
+ * to make VAC/VIC behaviour more regular.
+ */
+static void intr_begin(struct async_struct* info)
+{
+ serial_outw(info, VAC_UART_INT_MASK, 0);
+}
+
+static void intr_end(struct async_struct* info)
+{
+ vac_outw(VAC_INT_CTRL_UART_DISABLE(info), VAC_INT_CTRL);
+ vac_outw(VAC_INT_CTRL_UART_ENABLE, VAC_INT_CTRL);
+
+ serial_outw(info, VAC_UART_INT_MASK, info->IER);
+}
+
+/*
+ * This is the serial driver's generic interrupt routine
+ */
+static void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+ int status;
+ struct async_struct * info;
+ int pass_counter = 0;
+ struct async_struct *end_mark = 0;
+
+#ifdef SERIAL_DEBUG_INTR
+ baget_printk("rs_interrupt(%d)...", irq);
+#endif
+
+ info = IRQ_ports[irq];
+ if (!info)
+ return;
+
+ do {
+ intr_begin(info); /* Mark we begin port handling */
+
+ if (!info->tty ||
+ (serial_inw (info, VAC_UART_INT_STATUS)
+ & VAC_UART_STATUS_INTS) == 0)
+ {
+ if (!end_mark)
+ end_mark = info;
+ goto next;
+ }
+ end_mark = 0;
+
+ info->last_active = jiffies;
+
+ status = serial_inw(info, VAC_UART_INT_STATUS);
+#ifdef SERIAL_DEBUG_INTR
+ baget_printk("status = %x...", status);
+#endif
+ if (status & VAC_UART_STATUS_RX_READY) {
+ receive_chars(info, &status);
+ }
+ check_modem_status(info);
+ if (status & VAC_UART_STATUS_TX_EMPTY)
+ transmit_chars(info, 0);
+
+ next:
+ intr_end(info); /* Mark this port handled */
+
+ info = info->next_port;
+ if (!info) {
+ info = IRQ_ports[irq];
+ if (pass_counter++ > RS_ISR_PASS_LIMIT) {
+ break; /* Prevent infinite loops */
+ }
+ continue;
+ }
+ } while (end_mark != info);
+#ifdef SERIAL_DEBUG_INTR
+ baget_printk("end.\n");
+#endif
+
+
+}
+#endif /* #ifdef CONFIG_SERIAL_SHARE_IRQ */
+
+
+/* The original driver was simplified here:
+ two functions were joined to reduce code */
+
+#define rs_interrupt_single rs_interrupt
+
+
+/*
+ * -------------------------------------------------------------------
+ * 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 async_struct *info = (struct async_struct *) 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);
+ }
+}
+
+/*
+ * ---------------------------------------------------------------
+ * Low level utility subroutines for the serial driver: routines to
+ * figure out the appropriate timeout for an interrupt chain, routines
+ * to initialize and startup a serial port, and routines to shutdown a
+ * serial port. Useful stuff like that.
+ * ---------------------------------------------------------------
+ */
+
+/*
+ * This routine figures out the correct timeout for a particular IRQ.
+ * It uses the smallest timeout of all of the serial ports in a
+ * particular interrupt chain. Now only used for IRQ 0....
+ */
+static void figure_IRQ_timeout(int irq)
+{
+ struct async_struct *info;
+ int timeout = 60*HZ; /* 60 seconds === a long time :-) */
+
+ info = IRQ_ports[irq];
+ if (!info) {
+ IRQ_timeout[irq] = 60*HZ;
+ return;
+ }
+ while (info) {
+ if (info->timeout < timeout)
+ timeout = info->timeout;
+ info = info->next_port;
+ }
+ if (!irq)
+ timeout = timeout / 2;
+ IRQ_timeout[irq] = timeout ? timeout : 1;
+}
+
+static int startup(struct async_struct * info)
+{
+ unsigned long flags;
+ int retval=0;
+ void (*handler)(int, void *, struct pt_regs *);
+ struct serial_state *state= info->state;
+ unsigned long page;
+
+ page = get_free_page(GFP_KERNEL);
+ if (!page)
+ return -ENOMEM;
+
+ save_flags(flags); cli();
+
+ if (info->flags & ASYNC_INITIALIZED) {
+ free_page(page);
+ goto errout;
+ }
+ if (!state->port || !state->type) {
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+ free_page(page);
+ goto errout;
+ }
+ if (info->xmit_buf)
+ free_page(page);
+ else
+ info->xmit_buf = (unsigned char *) page;
+
+#ifdef SERIAL_DEBUG_OPEN
+ baget_printk("starting up ttys%d (irq %d)...", info->line, state->irq);
+#endif
+
+ if (uart_config[info->state->type].flags & UART_STARTECH) {
+ /* Wake up UART */
+ serial_outp(info, VAC_UART_MODE, 0);
+ serial_outp(info, VAC_UART_INT_MASK, 0);
+ }
+
+ /*
+ * Allocate the IRQ if necessary
+ */
+ if (state->irq && (!IRQ_ports[state->irq] ||
+ !IRQ_ports[state->irq]->next_port)) {
+
+ if (IRQ_ports[state->irq]) {
+#ifdef CONFIG_SERIAL_SHARE_IRQ
+ free_irq(state->irq, NULL);
+ handler = rs_interrupt;
+#else
+ retval = -EBUSY;
+ goto errout;
+#endif /* CONFIG_SERIAL_SHARE_IRQ */
+ } else
+ handler = rs_interrupt_single;
+
+
+ retval = request_irq(state->irq, handler, IRQ_T(state),
+ "serial", NULL);
+ if (retval) {
+ if (capable(CAP_SYS_ADMIN)) {
+ if (info->tty)
+ set_bit(TTY_IO_ERROR,
+ &info->tty->flags);
+ retval = 0;
+ }
+ goto errout;
+ }
+ }
+
+ /*
+ * Insert serial port into IRQ chain.
+ */
+ info->prev_port = 0;
+ info->next_port = IRQ_ports[state->irq];
+ if (info->next_port)
+ info->next_port->prev_port = info;
+ IRQ_ports[state->irq] = info;
+ figure_IRQ_timeout(state->irq);
+
+ /*
+ * Clear the interrupt registers.
+ */
+ /* (void) serial_inw(info, VAC_UART_INT_STATUS); */ /* (see above) */
+ (void) serial_inw(info, VAC_UART_RX);
+
+ /*
+ * Now, initialize the UART
+ */
+ serial_outp(info, VAC_UART_MODE, VAC_UART_MODE_INITIAL); /*reset DLAB*/
+
+ /*
+ * Finally, enable interrupts
+ */
+ info->IER = VAC_UART_INT_RX_BREAK_CHANGE | VAC_UART_INT_RX_ERRS | \
+ VAC_UART_INT_RX_READY;
+ serial_outp(info, VAC_UART_INT_MASK, info->IER); /*enable interrupts*/
+
+ /*
+ * And clear the interrupt registers again for luck.
+ */
+ (void)serial_inp(info, VAC_UART_INT_STATUS);
+ (void)serial_inp(info, VAC_UART_RX);
+
+ if (info->tty)
+ clear_bit(TTY_IO_ERROR, &info->tty->flags);
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+ /*
+ * Set up serial timers...
+ */
+ mod_timer(&vacs_timer, jiffies + 2*HZ/100);
+
+ /*
+ * and set the speed of the serial port
+ */
+ change_speed(info);
+
+ info->flags |= ASYNC_INITIALIZED;
+ restore_flags(flags);
+ return 0;
+
+errout:
+ restore_flags(flags);
+ return retval;
+}
+
+/*
+ * 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 async_struct * info)
+{
+ unsigned long flags;
+ struct serial_state *state;
+ int retval;
+
+ if (!(info->flags & ASYNC_INITIALIZED))
+ return;
+
+ state = info->state;
+
+#ifdef SERIAL_DEBUG_OPEN
+ baget_printk("Shutting down serial port %d (irq %d)....", info->line,
+ state->irq);
+#endif
+
+ save_flags(flags); cli(); /* Disable interrupts */
+
+ /*
+ * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
+ * here so the queue might never be waken up
+ */
+ wake_up_interruptible(&info->delta_msr_wait);
+
+ /*
+ * First unlink the serial port from the IRQ chain...
+ */
+ if (info->next_port)
+ info->next_port->prev_port = info->prev_port;
+ if (info->prev_port)
+ info->prev_port->next_port = info->next_port;
+ else
+ IRQ_ports[state->irq] = info->next_port;
+ figure_IRQ_timeout(state->irq);
+
+ /*
+ * Free the IRQ, if necessary
+ */
+ if (state->irq && (!IRQ_ports[state->irq] ||
+ !IRQ_ports[state->irq]->next_port)) {
+ if (IRQ_ports[state->irq]) {
+ free_irq(state->irq, NULL);
+ retval = request_irq(state->irq, rs_interrupt_single,
+ IRQ_T(state), "serial", NULL);
+
+ if (retval)
+ printk("serial shutdown: request_irq: error %d"
+ " Couldn't reacquire IRQ.\n", retval);
+ } else
+ free_irq(state->irq, NULL);
+ }
+
+ if (info->xmit_buf) {
+ free_page((unsigned long) info->xmit_buf);
+ info->xmit_buf = 0;
+ }
+
+ info->IER = 0;
+ serial_outp(info, VAC_UART_INT_MASK, 0x00); /* disable all intrs */
+
+ /* disable break condition */
+ serial_out(info, VAC_UART_MODE, serial_inp(info, VAC_UART_MODE) & \
+ ~VAC_UART_MODE_SEND_BREAK);
+
+ if (info->tty)
+ set_bit(TTY_IO_ERROR, &info->tty->flags);
+
+ info->flags &= ~ASYNC_INITIALIZED;
+ restore_flags(flags);
+}
+
+/*
+ * When we set line mode, we call this function
+ * for Baget-specific adjustments.
+ */
+
+static inline unsigned short vac_uart_mode_fixup (unsigned short cval)
+{
+#ifdef QUAD_UART_SPEED
+ /*
+ * When we are using 4-x advantage in speed:
+ *
+ * Disadvantage : can't support 75, 150 bauds
+ * Advantage : can support 19200, 38400 bauds
+ */
+ char speed = 7 & (cval >> 10);
+ cval &= ~(7 << 10);
+ cval |= VAC_UART_MODE_BAUD(speed-2);
+#endif
+
+ /*
+ * In general, we have Tx and Rx ON all time
+ * and use int mask flag for their disabling.
+ */
+ cval |= VAC_UART_MODE_RX_ENABLE;
+ cval |= VAC_UART_MODE_TX_ENABLE;
+ cval |= VAC_UART_MODE_CHAR_RX_ENABLE;
+ cval |= VAC_UART_MODE_CHAR_TX_ENABLE;
+
+ /* Low 4 bits are not used in UART */
+ cval &= ~0xf;
+
+ return cval;
+}
+
+/*
+ * 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 async_struct *info)
+{
+ unsigned short port;
+ int quot = 0, baud_base, baud;
+ unsigned cflag, cval;
+ int bits;
+ unsigned long flags;
+
+ if (!info->tty || !info->tty->termios)
+ return;
+ cflag = info->tty->termios->c_cflag;
+ if (!(port = info->port))
+ return;
+
+ /* byte size and parity */
+ switch (cflag & CSIZE) {
+ case CS7: cval = 0x0; bits = 9; break;
+ case CS8: cval = VAC_UART_MODE_8BIT_CHAR; bits = 10; break;
+ /* Never happens, but GCC is too dumb to figure it out */
+ case CS5:
+ case CS6:
+ default: cval = 0x0; bits = 9; break;
+ }
+ cval &= ~VAC_UART_MODE_PARITY_ENABLE;
+ if (cflag & PARENB) {
+ cval |= VAC_UART_MODE_PARITY_ENABLE;
+ bits++;
+ }
+ if (cflag & PARODD)
+ cval |= VAC_UART_MODE_PARITY_ODD;
+
+ /* Determine divisor based on baud rate */
+ baud = tty_get_baud_rate(info->tty);
+ if (!baud)
+ baud = 9600; /* B0 transition handled in rs_set_termios */
+ baud_base = info->state->baud_base;
+ if (baud == 38400 &&
+ ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
+ quot = info->state->custom_divisor;
+ else {
+ if (baud == 134)
+ /* Special case since 134 is really 134.5 */
+ quot = (2*baud_base / 269);
+ else if (baud)
+ quot = baud_base / baud;
+ }
+ /* If the quotient is ever zero, default to 9600 bps */
+ if (!quot)
+ quot = baud_base / 9600;
+ info->quot = quot;
+ info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
+ info->timeout += HZ/50; /* Add .02 seconds of slop */
+
+ serial_out(info, VAC_UART_INT_MASK, info->IER);
+
+ /*
+ * Set up parity check flag
+ */
+#define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
+
+ info->read_status_mask = VAC_UART_STATUS_RX_ERR_OVERRUN | \
+ VAC_UART_STATUS_TX_EMPTY | VAC_UART_STATUS_RX_READY;
+ if (I_INPCK(info->tty))
+ info->read_status_mask |= VAC_UART_STATUS_RX_ERR_FRAME | \
+ VAC_UART_STATUS_RX_ERR_PARITY;
+ if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
+ info->read_status_mask |= VAC_UART_STATUS_RX_BREAK_CHANGE;
+
+ /*
+ * Characters to ignore
+ */
+ info->ignore_status_mask = 0;
+ if (I_IGNPAR(info->tty))
+ info->ignore_status_mask |= VAC_UART_STATUS_RX_ERR_PARITY | \
+ VAC_UART_STATUS_RX_ERR_FRAME;
+ if (I_IGNBRK(info->tty)) {
+ info->ignore_status_mask |= VAC_UART_STATUS_RX_BREAK_CHANGE;
+ /*
+ * If we're ignore parity and break indicators, ignore
+ * overruns too. (For real raw support).
+ */
+ if (I_IGNPAR(info->tty))
+ info->ignore_status_mask |= \
+ VAC_UART_STATUS_RX_ERR_OVERRUN;
+ }
+ /*
+ * !!! ignore all characters if CREAD is not set
+ */
+ if ((cflag & CREAD) == 0)
+ info->ignore_status_mask |= VAC_UART_STATUS_RX_READY;
+ save_flags(flags); cli();
+
+
+ switch (baud) {
+ default:
+ case 9600:
+ cval |= VAC_UART_MODE_BAUD(7);
+ break;
+ case 4800:
+ cval |= VAC_UART_MODE_BAUD(6);
+ break;
+ case 2400:
+ cval |= VAC_UART_MODE_BAUD(5);
+ break;
+ case 1200:
+ cval |= VAC_UART_MODE_BAUD(4);
+ break;
+ case 600:
+ cval |= VAC_UART_MODE_BAUD(3);
+ break;
+ case 300:
+ cval |= VAC_UART_MODE_BAUD(2);
+ break;
+#ifndef QUAD_UART_SPEED
+ case 150:
+#else
+ case 38400:
+#endif
+ cval |= VAC_UART_MODE_BAUD(1);
+ break;
+#ifndef QUAD_UART_SPEED
+ case 75:
+#else
+ case 19200:
+#endif
+ cval |= VAC_UART_MODE_BAUD(0);
+ break;
+ }
+
+ /* Baget VAC need some adjustments for computed value */
+ cval = vac_uart_mode_fixup(cval);
+
+ serial_outp(info, VAC_UART_MODE, cval);
+ restore_flags(flags);
+}
+
+static void rs_put_char(struct tty_struct *tty, unsigned char ch)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_put_char"))
+ return;
+
+ if (!tty || !info->xmit_buf)
+ return;
+
+ save_flags(flags); cli();
+ if (info->xmit_cnt >= SERIAL_XMIT_SIZE - 1) {
+ restore_flags(flags);
+ return;
+ }
+
+ info->xmit_buf[info->xmit_head++] = ch;
+ info->xmit_head &= SERIAL_XMIT_SIZE-1;
+ info->xmit_cnt++;
+ restore_flags(flags);
+}
+
+static void rs_flush_chars(struct tty_struct *tty)
+{
+ struct async_struct *info = (struct async_struct *)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;
+
+ save_flags(flags); cli();
+ info->IER |= VAC_UART_INT_TX_EMPTY;
+ serial_out(info, VAC_UART_INT_MASK, info->IER);
+ restore_flags(flags);
+}
+
+static int rs_write(struct tty_struct * tty, int from_user,
+ const unsigned char *buf, int count)
+{
+ int c, ret = 0;
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_write"))
+ return 0;
+
+ if (!tty || !info->xmit_buf || !tmp_buf)
+ return 0;
+
+ save_flags(flags);
+ if (from_user) {
+ down(&tmp_buf_sem);
+ while (1) {
+ c = MIN(count,
+ MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+ SERIAL_XMIT_SIZE - info->xmit_head));
+ if (c <= 0)
+ break;
+
+ c -= copy_from_user(tmp_buf, buf, c);
+ if (!c) {
+ if (!ret)
+ ret = -EFAULT;
+ break;
+ }
+ cli();
+ 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);
+ info->xmit_head = ((info->xmit_head + c) &
+ (SERIAL_XMIT_SIZE-1));
+ info->xmit_cnt += c;
+ restore_flags(flags);
+ buf += c;
+ count -= c;
+ ret += c;
+ }
+ up(&tmp_buf_sem);
+ } else {
+ while (1) {
+ cli();
+ c = MIN(count,
+ MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
+ SERIAL_XMIT_SIZE - info->xmit_head));
+ if (c <= 0) {
+ restore_flags(flags);
+ break;
+ }
+ 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;
+ ret += c;
+ }
+ }
+ if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
+ !(info->IER & VAC_UART_INT_TX_EMPTY)) {
+ info->IER |= VAC_UART_INT_TX_EMPTY;
+ serial_out(info, VAC_UART_INT_MASK, info->IER);
+ }
+ return ret;
+}
+
+static int rs_write_room(struct tty_struct *tty)
+{
+ struct async_struct *info = (struct async_struct *)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 async_struct *info = (struct async_struct *)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 async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
+ return;
+
+ save_flags(flags); cli();
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+ restore_flags(flags);
+
+ wake_up_interruptible(&tty->write_wait);
+ if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
+ tty->ldisc.write_wakeup)
+ (tty->ldisc.write_wakeup)(tty);
+}
+
+/*
+ * This function is used to send a high-priority XON/XOFF character to
+ * the device
+ */
+static void rs_send_xchar(struct tty_struct *tty, char ch)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+
+ if (serial_paranoia_check(info, tty->device, "rs_send_char"))
+ return;
+
+ info->x_char = ch;
+ if (ch) {
+ /* Make sure transmit interrupts are on */
+ info->IER |= VAC_UART_INT_TX_EMPTY;
+ serial_out(info, VAC_UART_INT_MASK, info->IER);
+ }
+}
+
+/*
+ * ------------------------------------------------------------
+ * 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 async_struct *info = (struct async_struct *)tty->driver_data;
+
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ baget_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))
+ rs_send_xchar(tty, STOP_CHAR(tty));
+}
+
+static void rs_unthrottle(struct tty_struct * tty)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+#ifdef SERIAL_DEBUG_THROTTLE
+ char buf[64];
+
+ baget_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
+ rs_send_xchar(tty, START_CHAR(tty));
+ }
+}
+
+/*
+ * ------------------------------------------------------------
+ * rs_ioctl() and friends
+ * ------------------------------------------------------------
+ */
+
+static int get_serial_info(struct async_struct * info,
+ struct serial_struct * retinfo)
+{
+ struct serial_struct tmp;
+ struct serial_state *state = info->state;
+
+ if (!retinfo)
+ return -EFAULT;
+ memset(&tmp, 0, sizeof(tmp));
+ tmp.type = state->type;
+ tmp.line = state->line;
+ tmp.port = state->port;
+ tmp.irq = state->irq;
+ tmp.flags = state->flags;
+ tmp.xmit_fifo_size = state->xmit_fifo_size;
+ tmp.baud_base = state->baud_base;
+ tmp.close_delay = state->close_delay;
+ tmp.closing_wait = state->closing_wait;
+ tmp.custom_divisor = state->custom_divisor;
+ tmp.hub6 = state->hub6;
+ if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
+ return -EFAULT;
+ return 0;
+}
+
+static int set_serial_info(struct async_struct * info,
+ struct serial_struct * new_info)
+{
+ struct serial_struct new_serial;
+ struct serial_state old_state, *state;
+ unsigned int i,change_irq,change_port;
+ int retval = 0;
+
+ if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
+ return -EFAULT;
+ state = info->state;
+ old_state = *state;
+
+ change_irq = new_serial.irq != state->irq;
+ change_port = (new_serial.port != state->port) ||
+ (new_serial.hub6 != state->hub6);
+
+ if (!capable(CAP_SYS_ADMIN)) {
+ if (change_irq || change_port ||
+ (new_serial.baud_base != state->baud_base) ||
+ (new_serial.type != state->type) ||
+ (new_serial.close_delay != state->close_delay) ||
+ (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
+ ((new_serial.flags & ~ASYNC_USR_MASK) !=
+ (state->flags & ~ASYNC_USR_MASK)))
+ return -EPERM;
+ state->flags = ((state->flags & ~ASYNC_USR_MASK) |
+ (new_serial.flags & ASYNC_USR_MASK));
+ info->flags = ((state->flags & ~ASYNC_USR_MASK) |
+ (info->flags & ASYNC_USR_MASK));
+ state->custom_divisor = new_serial.custom_divisor;
+ goto check_and_exit;
+ }
+
+ new_serial.irq = new_serial.irq;
+
+ if ((new_serial.irq >= NR_IRQS) || (new_serial.port > 0xffff) ||
+ (new_serial.baud_base == 0) || (new_serial.type < PORT_UNKNOWN) ||
+ (new_serial.type > PORT_MAX) || (new_serial.type == PORT_CIRRUS) ||
+ (new_serial.type == PORT_STARTECH)) {
+ return -EINVAL;
+ }
+
+ if ((new_serial.type != state->type) ||
+ (new_serial.xmit_fifo_size <= 0))
+ new_serial.xmit_fifo_size =
+ uart_config[state->type].dfl_xmit_fifo_size;
+
+ /* Make sure address is not already in use */
+ if (new_serial.type) {
+ for (i = 0 ; i < NR_PORTS; i++)
+ if ((state != &rs_table[i]) &&
+ (rs_table[i].port == new_serial.port) &&
+ rs_table[i].type)
+ return -EADDRINUSE;
+ }
+
+ if ((change_port || change_irq) && (state->count > 1))
+ return -EBUSY;
+
+ /*
+ * OK, past this point, all the error checking has been done.
+ * At this point, we start making changes.....
+ */
+
+ state->baud_base = new_serial.baud_base;
+ state->flags = ((state->flags & ~ASYNC_FLAGS) |
+ (new_serial.flags & ASYNC_FLAGS));
+ info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
+ (info->flags & ASYNC_INTERNAL_FLAGS));
+ state->custom_divisor = new_serial.custom_divisor;
+ state->type = new_serial.type;
+ state->close_delay = new_serial.close_delay * HZ/100;
+ state->closing_wait = new_serial.closing_wait * HZ/100;
+ info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+ info->xmit_fifo_size = state->xmit_fifo_size =
+ new_serial.xmit_fifo_size;
+
+ release_region(state->port,8);
+ if (change_port || change_irq) {
+ /*
+ * We need to shutdown the serial port at the old
+ * port/irq combination.
+ */
+ shutdown(info);
+ state->irq = new_serial.irq;
+ info->port = state->port = new_serial.port;
+ info->hub6 = state->hub6 = new_serial.hub6;
+ }
+ if (state->type != PORT_UNKNOWN)
+ request_region(state->port,8,"serial(set)");
+
+
+check_and_exit:
+ if (!state->port || !state->type)
+ return 0;
+ if (info->flags & ASYNC_INITIALIZED) {
+ if (((old_state.flags & ASYNC_SPD_MASK) !=
+ (state->flags & ASYNC_SPD_MASK)) ||
+ (old_state.custom_divisor != state->custom_divisor)) {
+ if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
+ info->tty->alt_speed = 57600;
+ if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
+ info->tty->alt_speed = 115200;
+ if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
+ info->tty->alt_speed = 230400;
+ if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
+ info->tty->alt_speed = 460800;
+ change_speed(info);
+ }
+ } else
+ 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 async_struct * info, unsigned int *value)
+{
+ unsigned short status;
+ unsigned int result;
+ unsigned long flags;
+
+ save_flags(flags); cli();
+ status = serial_inw(info, VAC_UART_INT_STATUS);
+ restore_flags(flags);
+ result = ((status & VAC_UART_STATUS_TX_EMPTY) ? TIOCSER_TEMT : 0);
+ return put_user(result,value);
+}
+
+
+static int get_modem_info(struct async_struct * info, unsigned int *value)
+{
+ unsigned int result;
+
+ result = TIOCM_CAR | TIOCM_DSR;
+ return put_user(result,value);
+}
+
+static int set_modem_info(struct async_struct * info, unsigned int cmd,
+ unsigned int *value)
+{
+ unsigned int arg;
+
+ if (get_user(arg, value))
+ return -EFAULT;
+ switch (cmd) {
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int do_autoconfig(struct async_struct * info)
+{
+ int retval;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (info->state->count > 1)
+ return -EBUSY;
+
+ shutdown(info);
+
+ autoconfig(info->state);
+
+ retval = startup(info);
+ if (retval)
+ return retval;
+ return 0;
+}
+
+/*
+ * rs_break() --- routine which turns the break handling on or off
+ */
+static void rs_break(struct tty_struct *tty, int break_state)
+{
+ struct async_struct * info = (struct async_struct *)tty->driver_data;
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_break"))
+ return;
+
+ if (!info->port)
+ return;
+ save_flags(flags); cli();
+ if (break_state == -1)
+ serial_outp(info, VAC_UART_MODE,
+ serial_inp(info, VAC_UART_MODE) | \
+ VAC_UART_MODE_SEND_BREAK);
+ else
+ serial_outp(info, VAC_UART_MODE,
+ serial_inp(info, VAC_UART_MODE) & \
+ ~VAC_UART_MODE_SEND_BREAK);
+ restore_flags(flags);
+}
+
+static int rs_ioctl(struct tty_struct *tty, struct file * file,
+ unsigned int cmd, unsigned long arg)
+{
+ int error;
+ struct async_struct * info = (struct async_struct *)tty->driver_data;
+ struct async_icount cprev, cnow; /* kernel counter temps */
+ struct serial_icounter_struct *p_cuser; /* user space */
+ unsigned long flags;
+
+ if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
+ return -ENODEV;
+
+ if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
+ (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
+ (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
+ if (tty->flags & (1 << TTY_IO_ERROR))
+ return -EIO;
+ }
+
+ switch (cmd) {
+ 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 TIOCSERCONFIG:
+ return do_autoconfig(info);
+
+ case TIOCSERGETLSR: /* Get line status register */
+ return get_lsr_info(info, (unsigned int *) arg);
+
+ case TIOCSERGSTRUCT:
+ if (copy_to_user((struct async_struct *) arg,
+ info, sizeof(struct async_struct)))
+ return -EFAULT;
+ return 0;
+
+ /*
+ * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)to change
+ * - mask passed in arg for lines of interest
+ * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
+ * Caller should use TIOCGICOUNT to see which one it was
+ */
+ case TIOCMIWAIT:
+ save_flags(flags); cli();
+ /* note the counters on entry */
+ cprev = info->state->icount;
+ restore_flags(flags);
+ while (1) {
+ interruptible_sleep_on(&info->delta_msr_wait);
+ /* see if a signal did it */
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+ save_flags(flags); cli();
+ cnow = info->state->icount; /* atomic copy */
+ restore_flags(flags);
+ if (cnow.rng == cprev.rng &&
+ cnow.dsr == cprev.dsr &&
+ cnow.dcd == cprev.dcd &&
+ cnow.cts == cprev.cts)
+ return -EIO; /* no change => error */
+ if ( ((arg & TIOCM_RNG) &&
+ (cnow.rng != cprev.rng)) ||
+ ((arg & TIOCM_DSR) &&
+ (cnow.dsr != cprev.dsr)) ||
+ ((arg & TIOCM_CD) &&
+ (cnow.dcd != cprev.dcd)) ||
+ ((arg & TIOCM_CTS) &&
+ (cnow.cts != cprev.cts)) ) {
+ return 0;
+ }
+ cprev = cnow;
+ }
+ /* NOTREACHED */
+
+ /*
+ * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
+ * Return: write counters to the user passed counter struct
+ * NB: both 1->0 and 0->1 transitions are counted except for
+ * RI where only 0->1 is counted.
+ */
+ case TIOCGICOUNT:
+ save_flags(flags); cli();
+ cnow = info->state->icount;
+ restore_flags(flags);
+ p_cuser = (struct serial_icounter_struct *) arg;
+ error = put_user(cnow.cts, &p_cuser->cts);
+ if (error) return error;
+ error = put_user(cnow.dsr, &p_cuser->dsr);
+ if (error) return error;
+ error = put_user(cnow.rng, &p_cuser->rng);
+ if (error) return error;
+ error = put_user(cnow.dcd, &p_cuser->dcd);
+ if (error) return error;
+ error = put_user(cnow.rx, &p_cuser->rx);
+ if (error) return error;
+ error = put_user(cnow.tx, &p_cuser->tx);
+ if (error) return error;
+ error = put_user(cnow.frame, &p_cuser->frame);
+ if (error) return error;
+ error = put_user(cnow.overrun, &p_cuser->overrun);
+ if (error) return error;
+ error = put_user(cnow.parity, &p_cuser->parity);
+ if (error) return error;
+ error = put_user(cnow.brk, &p_cuser->brk);
+ if (error) return error;
+ error = put_user(cnow.buf_overrun, &p_cuser->buf_overrun);
+
+ if (error) return error;
+ return 0;
+
+ case TIOCSERGWILD:
+ case TIOCSERSWILD:
+ /* "setserial -W" is called in Debian boot */
+ printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
+ return 0;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
+{
+ struct async_struct *info = (struct async_struct *)tty->driver_data;
+ unsigned int cflag = tty->termios->c_cflag;
+
+ if ( (cflag == old_termios->c_cflag)
+ && ( RELEVANT_IFLAG(tty->termios->c_iflag)
+ == RELEVANT_IFLAG(old_termios->c_iflag)))
+ return;
+
+ change_speed(info);
+
+ /* Handle turning off CRTSCTS */
+ if ((old_termios->c_cflag & CRTSCTS) &&
+ !(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
+ * async 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 async_struct * info = (struct async_struct *)tty->driver_data;
+ struct serial_state *state;
+ unsigned long flags;
+
+ if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
+ return;
+
+ state = info->state;
+
+ save_flags(flags); cli();
+
+ if (tty_hung_up_p(filp)) {
+ DBG_CNT("before DEC-hung");
+ MOD_DEC_USE_COUNT;
+ restore_flags(flags);
+ return;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ baget_printk("rs_close ttys%d, count = %d\n",
+ info->line, state->count);
+#endif
+ if ((tty->count == 1) && (state->count != 1)) {
+ /*
+ * Uh, oh. tty->count is 1, which means that the tty
+ * structure will be freed. state->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.
+ */
+ baget_printk("rs_close: bad serial port count; "
+ "tty->count is 1, "
+ "state->count is %d\n", state->count);
+ state->count = 1;
+ }
+ if (--state->count < 0) {
+ baget_printk("rs_close: bad serial port count for "
+ "ttys%d: %d\n",
+ info->line, state->count);
+ state->count = 0;
+ }
+ if (state->count) {
+ DBG_CNT("before DEC-2");
+ MOD_DEC_USE_COUNT;
+ restore_flags(flags);
+ return;
+ }
+ info->flags |= ASYNC_CLOSING;
+ /*
+ * Save the termios structure, since this port may have
+ * separate termios for callout and dialin.
+ */
+ if (info->flags & ASYNC_NORMAL_ACTIVE)
+ info->state->normal_termios = *tty->termios;
+ if (info->flags & ASYNC_CALLOUT_ACTIVE)
+ info->state->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 != ASYNC_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.
+ */
+ info->IER &= ~(VAC_UART_INT_RX_BREAK_CHANGE | VAC_UART_INT_RX_ERRS);
+ info->read_status_mask &= ~VAC_UART_STATUS_RX_READY;
+ if (info->flags & ASYNC_INITIALIZED) {
+ serial_outw(info, VAC_UART_INT_MASK, info->IER);
+ /*
+ * Before we drop DTR, make sure the UART transmitter
+ * has completely drained; this is especially
+ * important if there is a transmit FIFO!
+ */
+ rs_wait_until_sent(tty, info->timeout);
+ }
+ 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 (info->blocked_open) {
+ if (info->close_delay) {
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(info->close_delay);
+ }
+ wake_up_interruptible(&info->open_wait);
+ }
+ info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
+ ASYNC_CLOSING);
+ wake_up_interruptible(&info->close_wait);
+ MOD_DEC_USE_COUNT;
+ restore_flags(flags);
+}
+
+/*
+ * rs_wait_until_sent() --- wait until the transmitter is empty
+ */
+static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
+{
+ struct async_struct * info = (struct async_struct *)tty->driver_data;
+ unsigned long orig_jiffies, char_time;
+ int lsr;
+
+ if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
+ return;
+
+ if (info->state->type == PORT_UNKNOWN)
+ return;
+
+ if (info->xmit_fifo_size == 0)
+ return; /* Just in case.... */
+
+ orig_jiffies = jiffies;
+ /*
+ * Set the check interval to be 1/5 of the estimated time to
+ * send a single character, and make it at least 1. The check
+ * interval should also be less than the timeout.
+ *
+ * Note: we have to use pretty tight timings here to satisfy
+ * the NIST-PCTS.
+ */
+ char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
+ char_time = char_time / 5;
+ if (char_time == 0)
+ char_time = 1;
+ if (timeout)
+ char_time = MIN(char_time, timeout);
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+ baget_printk("In rs_wait_until_sent(%d) check=%lu...",
+ timeout, char_time);
+ baget_printk("jiff=%lu...", jiffies);
+#endif
+ while (!((lsr = serial_inp(info, VAC_UART_INT_STATUS)) & \
+ VAC_UART_STATUS_TX_EMPTY)) {
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+ baget_printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
+#endif
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(char_time);
+ if (signal_pending(current))
+ break;
+ if (timeout && time_after(jiffies, orig_jiffies + timeout))
+ break;
+ }
+ current->state = TASK_RUNNING;
+#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
+ baget_printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
+#endif
+}
+
+/*
+ * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
+ */
+static void rs_hangup(struct tty_struct *tty)
+{
+ struct async_struct * info = (struct async_struct *)tty->driver_data;
+ struct serial_state *state = info->state;
+
+ if (serial_paranoia_check(info, tty->device, "rs_hangup"))
+ return;
+
+ state = info->state;
+
+ rs_flush_buffer(tty);
+ shutdown(info);
+ info->event = 0;
+ state->count = 0;
+ info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_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 async_struct *info)
+{
+ DECLARE_WAITQUEUE(wait, current);
+ struct serial_state *state = info->state;
+ int retval;
+ int do_clocal = 0, extra_count = 0;
+ unsigned long flags;
+
+ /*
+ * If the device is in the middle of being closed, then block
+ * until it's done, and then try again.
+ */
+ if (tty_hung_up_p(filp) ||
+ (info->flags & ASYNC_CLOSING)) {
+ if (info->flags & ASYNC_CLOSING)
+ interruptible_sleep_on(&info->close_wait);
+#ifdef SERIAL_DO_RESTART
+ return ((info->flags & ASYNC_HUP_NOTIFY) ?
+ -EAGAIN : -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 & ASYNC_NORMAL_ACTIVE)
+ return -EBUSY;
+ if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (info->flags & ASYNC_SESSION_LOCKOUT) &&
+ (info->session != current->session))
+ return -EBUSY;
+ if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ (info->flags & ASYNC_PGRP_LOCKOUT) &&
+ (info->pgrp != current->pgrp))
+ return -EBUSY;
+ info->flags |= ASYNC_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 & ASYNC_CALLOUT_ACTIVE)
+ return -EBUSY;
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+ }
+
+ if (info->flags & ASYNC_CALLOUT_ACTIVE) {
+ if (state->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, state->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
+ baget_printk("block_til_ready before block: ttys%d, count = %d\n",
+ state->line, state->count);
+#endif
+ save_flags(flags); cli();
+ if (!tty_hung_up_p(filp)) {
+ extra_count = 1;
+ state->count--;
+ }
+ restore_flags(flags);
+ info->blocked_open++;
+ while (1) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (tty_hung_up_p(filp) ||
+ !(info->flags & ASYNC_INITIALIZED)) {
+#ifdef SERIAL_DO_RESTART
+ if (info->flags & ASYNC_HUP_NOTIFY)
+ retval = -EAGAIN;
+ else
+ retval = -ERESTARTSYS;
+#else
+ retval = -EAGAIN;
+#endif
+ break;
+ }
+ if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
+ !(info->flags & ASYNC_CLOSING))
+ break;
+ if (signal_pending(current)) {
+ retval = -ERESTARTSYS;
+ break;
+ }
+#ifdef SERIAL_DEBUG_OPEN
+ baget_printk("block_til_ready blocking: ttys%d, count = %d\n",
+ info->line, state->count);
+#endif
+ schedule();
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&info->open_wait, &wait);
+ if (extra_count)
+ state->count++;
+ info->blocked_open--;
+#ifdef SERIAL_DEBUG_OPEN
+ baget_printk("block_til_ready after blocking: ttys%d, count = %d\n",
+ info->line, state->count);
+#endif
+ if (retval)
+ return retval;
+ info->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+}
+
+static int get_async_struct(int line, struct async_struct **ret_info)
+{
+ struct async_struct *info;
+ struct serial_state *sstate;
+
+ sstate = rs_table + line;
+ sstate->count++;
+ if (sstate->info) {
+ *ret_info = sstate->info;
+ return 0;
+ }
+ info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
+ if (!info) {
+ sstate->count--;
+ return -ENOMEM;
+ }
+ memset(info, 0, sizeof(struct async_struct));
+ init_waitqueue_head(&info->open_wait);
+ init_waitqueue_head(&info->close_wait);
+ init_waitqueue_head(&info->delta_msr_wait);
+ info->magic = SERIAL_MAGIC;
+ info->port = sstate->port;
+ info->flags = sstate->flags;
+ info->xmit_fifo_size = sstate->xmit_fifo_size;
+ info->line = line;
+ info->tqueue.routine = do_softint;
+ info->tqueue.data = info;
+ info->state = sstate;
+ if (sstate->info) {
+ kfree(info);
+ *ret_info = sstate->info;
+ return 0;
+ }
+ *ret_info = sstate->info = info;
+ return 0;
+}
+
+/*
+ * This routine is called whenever a serial port is opened. It
+ * enables interrupts for a serial port, linking in its async structure into
+ * the IRQ chain. It also performs the serial-specific
+ * initialization for the tty structure.
+ */
+static int rs_open(struct tty_struct *tty, struct file * filp)
+{
+ struct async_struct *info;
+ int retval, line;
+ unsigned long page;
+
+ MOD_INC_USE_COUNT;
+ line = MINOR(tty->device) - tty->driver.minor_start;
+ if ((line < 0) || (line >= NR_PORTS)) {
+ MOD_DEC_USE_COUNT;
+ return -ENODEV;
+ }
+ retval = get_async_struct(line, &info);
+ if (retval) {
+ MOD_DEC_USE_COUNT;
+ return retval;
+ }
+ tty->driver_data = info;
+ info->tty = tty;
+ if (serial_paranoia_check(info, tty->device, "rs_open")) {
+ /* MOD_DEC_USE_COUNT; "info->tty" will cause this */
+ return -ENODEV;
+ }
+
+#ifdef SERIAL_DEBUG_OPEN
+ baget_printk("rs_open %s%d, count = %d\n",
+ tty->driver.name, info->line,
+ info->state->count);
+#endif
+ info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
+
+ if (!tmp_buf) {
+ page = get_free_page(GFP_KERNEL);
+ if (!page) {
+ /* MOD_DEC_USE_COUNT; "info->tty" will cause this */
+ return -ENOMEM;
+ }
+ if (tmp_buf)
+ free_page(page);
+ else
+ tmp_buf = (unsigned char *) page;
+ }
+
+ /*
+ * If the port is the middle of closing, bail out now
+ */
+ if (tty_hung_up_p(filp) ||
+ (info->flags & ASYNC_CLOSING)) {
+ if (info->flags & ASYNC_CLOSING)
+ interruptible_sleep_on(&info->close_wait);
+ /* MOD_DEC_USE_COUNT; "info->tty" will cause this */
+#ifdef SERIAL_DO_RESTART
+ return ((info->flags & ASYNC_HUP_NOTIFY) ?
+ -EAGAIN : -ERESTARTSYS);
+#else
+ return -EAGAIN;
+#endif
+ }
+
+ /*
+ * Start up serial port
+ */
+ retval = startup(info);
+ if (retval) {
+ /* MOD_DEC_USE_COUNT; "info->tty" will cause this */
+ return retval;
+ }
+
+ retval = block_til_ready(tty, filp, info);
+ if (retval) {
+ /* MOD_DEC_USE_COUNT; "info->tty" will cause this */
+#ifdef SERIAL_DEBUG_OPEN
+ baget_printk("rs_open returning after block_til_ready "
+ "with %d\n",
+ retval);
+#endif
+ return retval;
+ }
+
+ if ((info->state->count == 1) &&
+ (info->flags & ASYNC_SPLIT_TERMIOS)) {
+ if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
+ *tty->termios = info->state->normal_termios;
+ else
+ *tty->termios = info->state->callout_termios;
+ change_speed(info);
+ }
+#ifdef CONFIG_SERIAL_CONSOLE
+ if (sercons.cflag && sercons.index == line) {
+ tty->termios->c_cflag = sercons.cflag;
+ sercons.cflag = 0;
+ change_speed(info);
+ }
+#endif
+ info->session = current->session;
+ info->pgrp = current->pgrp;
+
+#ifdef SERIAL_DEBUG_OPEN
+ baget_printk("rs_open ttys%d successful...", info->line);
+#endif
+ return 0;
+}
+
+/*
+ * /proc fs routines....
+ */
+
+static inline int line_info(char *buf, struct serial_state *state)
+{
+ struct async_struct *info = state->info, scr_info;
+ int ret;
+
+ ret = sprintf(buf, "%d: uart:%s port:%X irq:%d",
+ state->line, uart_config[state->type].name,
+ state->port, state->irq);
+
+ if (!state->port || (state->type == PORT_UNKNOWN)) {
+ ret += sprintf(buf+ret, "\n");
+ return ret;
+ }
+
+ /*
+ * Figure out the current RS-232 lines
+ */
+ if (!info) {
+ info = &scr_info; /* This is just for serial_{in,out} */
+
+ info->magic = SERIAL_MAGIC;
+ info->port = state->port;
+ info->flags = state->flags;
+ info->quot = 0;
+ info->tty = 0;
+ }
+
+ if (info->quot) {
+ ret += sprintf(buf+ret, " baud:%d",
+ state->baud_base / info->quot);
+ }
+
+ ret += sprintf(buf+ret, " tx:%d rx:%d",
+ state->icount.tx, state->icount.rx);
+
+ if (state->icount.frame)
+ ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
+
+ if (state->icount.parity)
+ ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
+
+ if (state->icount.brk)
+ ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
+
+ if (state->icount.overrun)
+ ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
+
+ return ret;
+}
+
+int rs_read_proc(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ int i, len = 0, l;
+ off_t begin = 0;
+
+ len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
+ for (i = 0; i < NR_PORTS && len < 4000; i++) {
+ l = line_info(page + len, &rs_table[i]);
+ len += l;
+ if (len+begin > off+count)
+ goto done;
+ if (len+begin < off) {
+ begin += len;
+ len = 0;
+ }
+ }
+ *eof = 1;
+done:
+ if (off >= len+begin)
+ return 0;
+ *start = page + (off-begin);
+ return ((count < begin+len-off) ? count : begin+len-off);
+}
+
+/*
+ * ---------------------------------------------------------------------
+ * rs_init() and friends
+ *
+ * rs_init() is called at boot-time to initialize the serial driver.
+ * ---------------------------------------------------------------------
+ */
+
+/*
+ * This routine prints out the appropriate serial driver version
+ * number, and identifies which options were configured into this
+ * driver.
+ */
+static _INLINE_ void show_serial_version(void)
+{
+ printk(KERN_INFO "%s version %s with", serial_name, serial_version);
+#ifdef CONFIG_SERIAL_SHARE_IRQ
+ printk(" SHARE_IRQ");
+#endif
+#define SERIAL_OPT
+#ifdef CONFIG_SERIAL_DETECT_IRQ
+ printk(" DETECT_IRQ");
+#endif
+#ifdef SERIAL_OPT
+ printk(" enabled\n");
+#else
+ printk(" no serial options enabled\n");
+#endif
+#undef SERIAL_OPT
+}
+
+
+/*
+ * This routine is called by rs_init() to initialize a specific serial
+ * port. It determines what type of UART chip this serial port is
+ * using: 8250, 16450, 16550, 16550A. The important question is
+ * whether or not this UART is a 16550A or not, since this will
+ * determine whether or not we can use its FIFO features or not.
+ */
+
+/*
+ * Functionality of this function is reduced: we already know we have a VAC,
+ * but still need to perform some important actions (see code :-).
+ */
+static void autoconfig(struct serial_state * state)
+{
+ struct async_struct *info, scr_info;
+ unsigned long flags;
+
+ /* Setting up important parameters */
+ state->type = VAC_UART_TYPE;
+ state->xmit_fifo_size = uart_config[state->type].dfl_xmit_fifo_size;
+
+ info = &scr_info; /* This is just for serial_{in,out} */
+
+ info->magic = SERIAL_MAGIC;
+ info->port = state->port;
+ info->flags = state->flags;
+
+ save_flags(flags); cli();
+
+ /* + Flush VAC input fifo */
+ (void)serial_in(info, VAC_UART_RX);
+ (void)serial_in(info, VAC_UART_RX);
+ (void)serial_in(info, VAC_UART_RX);
+ (void)serial_in(info, VAC_UART_RX);
+
+ /* Disable interrupts */
+ serial_outp(info, VAC_UART_INT_MASK, 0);
+
+ restore_flags(flags);
+}
+
+int register_serial(struct serial_struct *req);
+void unregister_serial(int line);
+
+EXPORT_SYMBOL(register_serial);
+EXPORT_SYMBOL(unregister_serial);
+
+/*
+ * Important function for VAC UART check and reanimation.
+ */
+
+static void rs_timer(unsigned long dummy)
+{
+ static unsigned long last_strobe = 0;
+ struct async_struct *info;
+ unsigned int i;
+ unsigned long flags;
+
+ if ((jiffies - last_strobe) >= RS_STROBE_TIME) {
+ for (i=1; i < NR_IRQS; i++) {
+ info = IRQ_ports[i];
+ if (!info)
+ continue;
+ save_flags(flags); cli();
+#ifdef CONFIG_SERIAL_SHARE_IRQ
+ if (info->next_port) {
+ do {
+ serial_out(info, VAC_UART_INT_MASK, 0);
+ info->IER |= VAC_UART_INT_TX_EMPTY;
+ serial_out(info, VAC_UART_INT_MASK,
+ info->IER);
+ info = info->next_port;
+ } while (info);
+ rs_interrupt(i, NULL, NULL);
+ } else
+#endif /* CONFIG_SERIAL_SHARE_IRQ */
+ rs_interrupt_single(i, NULL, NULL);
+ restore_flags(flags);
+ }
+ }
+ last_strobe = jiffies;
+ mod_timer(&vacs_timer, jiffies + RS_STROBE_TIME);
+
+ /*
+ * It looks this code for case we share IRQ with console...
+ */
+
+ if (IRQ_ports[0]) {
+ save_flags(flags); cli();
+#ifdef CONFIG_SERIAL_SHARE_IRQ
+ rs_interrupt(0, NULL, NULL);
+#else
+ rs_interrupt_single(0, NULL, NULL);
+#endif
+ restore_flags(flags);
+
+ mod_timer(&vacs_timer, jiffies + IRQ_timeout[0] - 2);
+ }
+}
+
+/*
+ * The serial driver boot-time initialization code!
+ */
+int __init rs_init(void)
+{
+ int i;
+ struct serial_state * state;
+ extern void atomwide_serial_init (void);
+ extern void dualsp_serial_init (void);
+
+#ifdef CONFIG_ATOMWIDE_SERIAL
+ atomwide_serial_init ();
+#endif
+#ifdef CONFIG_DUALSP_SERIAL
+ dualsp_serial_init ();
+#endif
+
+ init_bh(SERIAL_BH, do_serial_bh);
+ init_timer(&vacs_timer);
+ vacs_timer.function = rs_timer;
+ vacs_timer.expires = 0;
+
+ for (i = 0; i < NR_IRQS; i++) {
+ IRQ_ports[i] = 0;
+ IRQ_timeout[i] = 0;
+ }
+
+
+/*
+ * It is not a good idea to share interrupts with console,
+ * but it looks we cannot avoid it.
+ */
+#if 0
+
+#ifdef CONFIG_SERIAL_CONSOLE
+ /*
+ * The interrupt of the serial console port
+ * can't be shared.
+ */
+ if (sercons.flags & CON_CONSDEV) {
+ for(i = 0; i < NR_PORTS; i++)
+ if (i != sercons.index &&
+ rs_table[i].irq == rs_table[sercons.index].irq)
+ rs_table[i].irq = 0;
+ }
+#endif
+
+#endif
+ show_serial_version();
+
+ /* Initialize the tty_driver structure */
+
+ memset(&serial_driver, 0, sizeof(struct tty_driver));
+ serial_driver.magic = TTY_DRIVER_MAGIC;
+ serial_driver.driver_name = "serial";
+ serial_driver.name = "ttyS";
+ serial_driver.major = TTY_MAJOR;
+ serial_driver.minor_start = 64;
+ serial_driver.num = NR_PORTS;
+ 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.put_char = rs_put_char;
+ 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.send_xchar = rs_send_xchar;
+ serial_driver.set_termios = rs_set_termios;
+ serial_driver.stop = rs_stop;
+ serial_driver.start = rs_start;
+ serial_driver.hangup = rs_hangup;
+ serial_driver.break_ctl = rs_break;
+ serial_driver.wait_until_sent = rs_wait_until_sent;
+ serial_driver.read_proc = rs_read_proc;
+
+ /*
+ * The callout device is just like normal device except for
+ * major number and the subtype code.
+ */
+ callout_driver = serial_driver;
+ callout_driver.name = "cua";
+ callout_driver.major = TTYAUX_MAJOR;
+ callout_driver.subtype = SERIAL_TYPE_CALLOUT;
+ callout_driver.read_proc = 0;
+ callout_driver.proc_entry = 0;
+
+ if (tty_register_driver(&serial_driver))
+ panic("Couldn't register serial driver");
+ if (tty_register_driver(&callout_driver))
+ panic("Couldn't register callout driver");
+
+ for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
+ state->magic = SSTATE_MAGIC;
+ state->line = i;
+ state->type = PORT_UNKNOWN;
+ state->custom_divisor = 0;
+ state->close_delay = 5*HZ/10;
+ state->closing_wait = 30*HZ;
+ state->callout_termios = callout_driver.init_termios;
+ state->normal_termios = serial_driver.init_termios;
+ state->icount.cts = state->icount.dsr =
+ state->icount.rng = state->icount.dcd = 0;
+ state->icount.rx = state->icount.tx = 0;
+ state->icount.frame = state->icount.parity = 0;
+ state->icount.overrun = state->icount.brk = 0;
+ state->irq = state->irq;
+ if (check_region(state->port,8))
+ continue;
+ if (state->flags & ASYNC_BOOT_AUTOCONF)
+ autoconfig(state);
+ }
+
+ /*
+ * Detect the IRQ only once every port is initialised,
+ * because some 16450 do not reset to 0 the MCR register.
+ */
+ for (i = 0, state = rs_table; i < NR_PORTS; i++,state++) {
+ if (state->type == PORT_UNKNOWN)
+ continue;
+ printk(KERN_INFO "ttyS%02d%s at 0x%04x (irq = %d) is a %s\n",
+ state->line,
+ (state->flags & ASYNC_FOURPORT) ? " FourPort" : "",
+ state->port, state->irq,
+ uart_config[state->type].name);
+ }
+ return 0;
+}
+
+/*
+ * register_serial and unregister_serial allows for serial ports to be
+ * configured at run-time, to support PCMCIA modems.
+ */
+int register_serial(struct serial_struct *req)
+{
+ int i;
+ unsigned long flags;
+ struct serial_state *state;
+
+ save_flags(flags);
+ cli();
+ for (i = 0; i < NR_PORTS; i++) {
+ if (rs_table[i].port == req->port)
+ break;
+ }
+ if (i == NR_PORTS) {
+ for (i = 0; i < NR_PORTS; i++)
+ if ((rs_table[i].type == PORT_UNKNOWN) &&
+ (rs_table[i].count == 0))
+ break;
+ }
+ if (i == NR_PORTS) {
+ restore_flags(flags);
+ return -1;
+ }
+ state = &rs_table[i];
+ if (rs_table[i].count) {
+ restore_flags(flags);
+ printk("Couldn't configure serial #%d (port=%d,irq=%d): "
+ "device already open\n", i, req->port, req->irq);
+ return -1;
+ }
+ state->irq = req->irq;
+ state->port = req->port;
+ state->flags = req->flags;
+
+ autoconfig(state);
+ if (state->type == PORT_UNKNOWN) {
+ restore_flags(flags);
+ printk("register_serial(): autoconfig failed\n");
+ return -1;
+ }
+ restore_flags(flags);
+
+ printk(KERN_INFO "tty%02d at 0x%04x (irq = %d) is a %s\n",
+ state->line, state->port, state->irq,
+ uart_config[state->type].name);
+ return state->line;
+}
+
+void unregister_serial(int line)
+{
+ unsigned long flags;
+ struct serial_state *state = &rs_table[line];
+
+ save_flags(flags);
+ cli();
+ if (state->info && state->info->tty)
+ tty_hangup(state->info->tty);
+ state->type = PORT_UNKNOWN;
+ printk(KERN_INFO "tty%02d unloaded\n", state->line);
+ restore_flags(flags);
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+ return rs_init();
+}
+
+void cleanup_module(void)
+{
+ unsigned long flags;
+ int e1, e2;
+ int i;
+
+ printk("Unloading %s: version %s\n", serial_name, serial_version);
+ save_flags(flags);
+ cli();
+
+ del_timer_sync(&vacs_timer);
+ remove_bh(SERIAL_BH);
+
+ if ((e1 = tty_unregister_driver(&serial_driver)))
+ printk("SERIAL: failed to unregister serial driver (%d)\n",
+ e1);
+ if ((e2 = tty_unregister_driver(&callout_driver)))
+ printk("SERIAL: failed to unregister callout driver (%d)\n",
+ e2);
+ restore_flags(flags);
+
+ for (i = 0; i < NR_PORTS; i++) {
+ if (rs_table[i].type != PORT_UNKNOWN)
+ release_region(rs_table[i].port, 8);
+ }
+ if (tmp_buf) {
+ free_page((unsigned long) tmp_buf);
+ tmp_buf = NULL;
+ }
+}
+#endif /* MODULE */
+
+
+/*
+ * ------------------------------------------------------------
+ * Serial console driver
+ * ------------------------------------------------------------
+ */
+#ifdef CONFIG_SERIAL_CONSOLE
+
+#define BOTH_EMPTY (VAC_UART_STATUS_TX_EMPTY | VAC_UART_STATUS_TX_EMPTY)
+
+/*
+ * Wait for transmitter & holding register to empty
+ */
+static inline void wait_for_xmitr(struct async_struct *info)
+{
+ int lsr;
+ unsigned int tmout = 1000000;
+
+ do {
+ lsr = serial_inp(info, VAC_UART_INT_STATUS);
+ if (--tmout == 0) break;
+ } while ((lsr & BOTH_EMPTY) != BOTH_EMPTY);
+}
+
+/*
+ * Print a string to the serial port trying not to disturb
+ * any possible real use of the port...
+ */
+static void serial_console_write(struct console *co, const char *s,
+ unsigned count)
+{
+ struct serial_state *ser;
+ int ier;
+ unsigned i;
+ struct async_struct scr_info; /* serial_{in,out} because HUB6 */
+
+ ser = rs_table + co->index;
+ scr_info.magic = SERIAL_MAGIC;
+ scr_info.port = ser->port;
+ scr_info.flags = ser->flags;
+
+ /*
+ * First save the IER then disable the interrupts
+ */
+ ier = serial_inp(&scr_info, VAC_UART_INT_MASK);
+ serial_outw(&scr_info, VAC_UART_INT_MASK, 0x00);
+
+ /*
+ * Now, do each character
+ */
+ for (i = 0; i < count; i++, s++) {
+ wait_for_xmitr(&scr_info);
+
+ /*
+ * Send the character out.
+ * If a LF, also do CR...
+ */
+ serial_outp(&scr_info, VAC_UART_TX, (unsigned short)*s << 8);
+ if (*s == 10) {
+ wait_for_xmitr(&scr_info);
+ serial_outp(&scr_info, VAC_UART_TX, 13 << 8);
+ }
+ }
+
+ /*
+ * Finally, Wait for transmitter & holding register to empty
+ * and restore the IER
+ */
+ wait_for_xmitr(&scr_info);
+ serial_outp(&scr_info, VAC_UART_INT_MASK, ier);
+}
+
+static kdev_t serial_console_device(struct console *c)
+{
+ return MKDEV(TTY_MAJOR, 64 + c->index);
+}
+
+/*
+ * Setup initial baud/bits/parity. We do two things here:
+ * - construct a cflag setting for the first rs_open()
+ * - initialize the serial port
+ * Return non-zero if we didn't find a serial port.
+ */
+static int __init serial_console_setup(struct console *co, char *options)
+{
+ struct serial_state *ser;
+ unsigned cval;
+ int baud = 9600;
+ int bits = 8;
+ int parity = 'n';
+ int cflag = CREAD | HUPCL | CLOCAL;
+ int quot = 0;
+ char *s;
+ struct async_struct scr_info; /* serial_{in,out} because HUB6 */
+
+ 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';
+ }
+
+ /*
+ * 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;
+ }
+ co->cflag = cflag;
+
+ /*
+ * Divisor, bytesize and parity
+ */
+ ser = rs_table + co->index;
+ scr_info.magic = SERIAL_MAGIC;
+ scr_info.port = ser->port;
+ scr_info.flags = ser->flags;
+
+ quot = ser->baud_base / baud;
+ cval = cflag & (CSIZE | CSTOPB);
+
+ cval >>= 4;
+
+ cval &= ~VAC_UART_MODE_PARITY_ENABLE;
+ if (cflag & PARENB)
+ cval |= VAC_UART_MODE_PARITY_ENABLE;
+ if (cflag & PARODD)
+ cval |= VAC_UART_MODE_PARITY_ODD;
+
+ /*
+ * Disable UART interrupts, set DTR and RTS high
+ * and set speed.
+ */
+ switch (baud) {
+ default:
+ case 9600:
+ cval |= VAC_UART_MODE_BAUD(7);
+ break;
+ case 4800:
+ cval |= VAC_UART_MODE_BAUD(6);
+ break;
+ case 2400:
+ cval |= VAC_UART_MODE_BAUD(5);
+ break;
+ case 1200:
+ cval |= VAC_UART_MODE_BAUD(4);
+ break;
+ case 600:
+ cval |= VAC_UART_MODE_BAUD(3);
+ break;
+ case 300:
+ cval |= VAC_UART_MODE_BAUD(2);
+ break;
+#ifndef QUAD_UART_SPEED
+ case 150:
+#else
+ case 38400:
+#endif
+ cval |= VAC_UART_MODE_BAUD(1);
+ break;
+#ifndef QUAD_UART_SPEED
+ case 75:
+#else
+ case 19200:
+#endif
+ cval |= VAC_UART_MODE_BAUD(0);
+ break;
+ }
+
+ /* Baget VAC need some adjustments for computed value */
+ cval = vac_uart_mode_fixup(cval);
+
+ serial_outp(&scr_info, VAC_UART_MODE, cval);
+ serial_outp(&scr_info, VAC_UART_INT_MASK, 0);
+
+ return 0;
+}
+
+static struct console sercons = {
+ .name = "ttyS",
+ .write = serial_console_write,
+ .device = serial_console_device,
+ .setup = serial_console_setup,
+ .flags = CON_PRINTBUFFER,
+ .index = -1,
+};
+
+/*
+ * Register console.
+ */
+long __init serial_console_init(long kmem_start, long kmem_end)
+{
+ register_console(&sercons);
+ return kmem_start;
+}
+#endif
+
+#ifdef CONFIG_KGDB
+#undef PRINT_DEBUG_PORT_INFO
+
+/*
+ * This is the interface to the remote debugger stub.
+ * I've put that here to be able to control the serial
+ * device more directly.
+ */
+
+static int initialized;
+
+static int rs_debug_init(struct async_struct *info)
+{
+ int quot;
+
+ autoconfig(info); /* autoconfigure ttyS0, whatever that is */
+
+#ifdef PRINT_DEBUG_PORT_INFO
+ baget_printk("kgdb debug interface:: tty%02d at 0x%04x",
+ info->line, info->port);
+ switch (info->type) {
+ case PORT_8250:
+ baget_printk(" is a 8250\n");
+ break;
+ case PORT_16450:
+ baget_printk(" is a 16450\n");
+ break;
+ case PORT_16550:
+ baget_printk(" is a 16550\n");
+ break;
+ case PORT_16550A:
+ baget_printk(" is a 16550A\n");
+ break;
+ case PORT_16650:
+ baget_printk(" is a 16650\n");
+ break;
+ default:
+ baget_printk(" is of unknown type -- unusable\n");
+ break;
+ }
+#endif
+
+ if (info->port == PORT_UNKNOWN)
+ return -1;
+
+ /*
+ * Clear all interrupts
+ */
+
+ (void)serial_inp(info, VAC_UART_INT_STATUS);
+ (void)serial_inp(info, VAC_UART_RX);
+
+ /*
+ * Now, initialize the UART
+ */
+ serial_outp(info,VAC_UART_MODE,VAC_UART_MODE_INITIAL); /* reset DLAB */
+ if (info->flags & ASYNC_FOURPORT) {
+ info->MCR = UART_MCR_DTR | UART_MCR_RTS;
+ info->MCR_noint = UART_MCR_DTR | UART_MCR_OUT1;
+ } else {
+ info->MCR = UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2;
+ info->MCR_noint = UART_MCR_DTR | UART_MCR_RTS;
+ }
+
+ info->MCR = info->MCR_noint; /* no interrupts, please */
+ /*
+ * and set the speed of the serial port
+ * (currently hardwired to 9600 8N1
+ */
+
+ quot = info->baud_base / 9600; /* baud rate is fixed to 9600 */
+ /* FIXME: if rs_debug interface is needed, we need to set speed here */
+
+ return 0;
+}
+
+int putDebugChar(char c)
+{
+ struct async_struct *info = rs_table;
+
+ if (!initialized) { /* need to init device first */
+ if (rs_debug_init(info) == 0)
+ initialized = 1;
+ else
+ return 0;
+ }
+
+ while ((serial_inw(info, VAC_UART_INT_STATUS) & \
+ VAC_UART_STATUS_TX_EMPTY) == 0)
+ ;
+ serial_out(info, VAC_UART_TX, (unsigned short)c << 8);
+
+ return 1;
+}
+
+char getDebugChar(void)
+{
+ struct async_struct *info = rs_table;
+
+ if (!initialized) { /* need to init device first */
+ if (rs_debug_init(info) == 0)
+ initialized = 1;
+ else
+ return 0;
+ }
+ while (!(serial_inw(info, VAC_UART_INT_STATUS) & \
+ VAC_UART_STATUS_RX_READY))
+ ;
+
+ return(serial_inp(info, VAC_UART_RX));
+}
+
+#endif /* CONFIG_KGDB */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)