zs.c
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上传日期:2013-02-24
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- /*
- * decserial.c: Serial port driver for IOASIC DECstations.
- *
- * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras.
- * Derived from drivers/macintosh/macserial.c by Harald Koerfgen.
- *
- * DECstation changes
- * Copyright (C) 1998-2000 Harald Koerfgen
- * Copyright (C) 2000,2001 Maciej W. Rozycki <macro@ds2.pg.gda.pl>
- *
- * For the rest of the code the original Copyright applies:
- * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- *
- *
- * Note: for IOASIC systems the wiring is as follows:
- *
- * mouse/keyboard:
- * DIN-7 MJ-4 signal SCC
- * 2 1 TxD <- A.TxD
- * 3 4 RxD -> A.RxD
- *
- * EIA-232/EIA-423:
- * DB-25 MMJ-6 signal SCC
- * 2 2 TxD <- B.TxD
- * 3 5 RxD -> B.RxD
- * 4 RTS <- ~A.RTS
- * 5 CTS -> ~B.CTS
- * 6 6 DSR -> ~A.SYNC
- * 8 CD -> ~B.DCD
- * 12 DSRS(DCE) -> ~A.CTS (*)
- * 15 TxC -> B.TxC
- * 17 RxC -> B.RxC
- * 20 1 DTR <- ~A.DTR
- * 22 RI -> ~A.DCD
- * 23 DSRS(DTE) <- ~B.RTS
- *
- * (*) EIA-232 defines the signal at this pin to be SCD, while DSRS(DCE)
- * is shared with DSRS(DTE) at pin 23.
- */
- #include <linux/config.h>
- #include <linux/version.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/major.h>
- #include <linux/string.h>
- #include <linux/fcntl.h>
- #include <linux/mm.h>
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/init.h>
- #include <linux/ioport.h>
- #ifdef CONFIG_SERIAL_CONSOLE
- #include <linux/console.h>
- #endif
- #include <asm/io.h>
- #include <asm/pgtable.h>
- #include <asm/irq.h>
- #include <asm/system.h>
- #include <asm/segment.h>
- #include <asm/bitops.h>
- #include <asm/uaccess.h>
- #include <asm/wbflush.h>
- #include <asm/bootinfo.h>
- #ifdef CONFIG_DECSTATION
- #include <asm/dec/interrupts.h>
- #include <asm/dec/machtype.h>
- #include <asm/dec/tc.h>
- #include <asm/dec/ioasic_addrs.h>
- #endif
- #ifdef CONFIG_BAGET_MIPS
- #include <asm/baget/baget.h>
- unsigned long system_base;
- #endif
- #ifdef CONFIG_KGDB
- #include <asm/kgdb.h>
- #endif
- #ifdef CONFIG_MAGIC_SYSRQ
- #include <linux/sysrq.h>
- #endif
- #include "zs.h"
- /*
- * It would be nice to dynamically allocate everything that
- * depends on NUM_SERIAL, so we could support any number of
- * Z8530s, but for now...
- */
- #define NUM_SERIAL 2 /* Max number of ZS chips supported */
- #define NUM_CHANNELS (NUM_SERIAL * 2) /* 2 channels per chip */
- #define CHANNEL_A_NR (zs_parms->channel_a_offset > zs_parms->channel_b_offset)
- /* Number of channel A in the chip */
- #define ZS_CHAN_IO_SIZE 8
- #define ZS_CLOCK 7372800 /* Z8530 RTxC input clock rate */
- #define RECOVERY_DELAY udelay(2)
- struct zs_parms {
- unsigned long scc0;
- unsigned long scc1;
- int channel_a_offset;
- int channel_b_offset;
- int irq;
- int clock;
- };
- static struct zs_parms *zs_parms;
- #ifdef CONFIG_DECSTATION
- static struct zs_parms ds_parms = {
- scc0 : SCC0,
- scc1 : SCC1,
- channel_a_offset : 1,
- channel_b_offset : 9,
- irq : SERIAL,
- clock : ZS_CLOCK
- };
- #endif
- #ifdef CONFIG_BAGET_MIPS
- static struct zs_parms baget_parms = {
- scc0 : UNI_SCC0,
- scc1 : UNI_SCC1,
- channel_a_offset : 9,
- channel_b_offset : 1,
- irq : BAGET_SCC_IRQ,
- clock : 14745000
- };
- #endif
- #ifdef CONFIG_DECSTATION
- #define DS_BUS_PRESENT (IOASIC)
- #else
- #define DS_BUS_PRESENT 0
- #endif
- #ifdef CONFIG_BAGET_MIPS
- #define BAGET_BUS_PRESENT (mips_machtype == MACH_BAGET202)
- #else
- #define BAGET_BUS_PRESENT 0
- #endif
- #define BUS_PRESENT (DS_BUS_PRESENT || BAGET_BUS_PRESENT)
- struct dec_zschannel zs_channels[NUM_CHANNELS];
- struct dec_serial zs_soft[NUM_CHANNELS];
- int zs_channels_found;
- struct dec_serial *zs_chain; /* list of all channels */
- struct tty_struct zs_ttys[NUM_CHANNELS];
- #ifdef CONFIG_SERIAL_CONSOLE
- static struct console sercons;
- #endif
- #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
- && !defined(MODULE)
- static unsigned long break_pressed; /* break, really ... */
- #endif
- static unsigned char zs_init_regs[16] __initdata = {
- 0, /* write 0 */
- 0, /* write 1 */
- 0xf0, /* write 2 */
- (Rx8), /* write 3 */
- (X16CLK | SB1), /* write 4 */
- (Tx8), /* write 5 */
- 0, 0, 0, /* write 6, 7, 8 */
- (VIS), /* write 9 */
- (NRZ), /* write 10 */
- (TCBR | RCBR), /* write 11 */
- 0, 0, /* BRG time constant, write 12 + 13 */
- (BRSRC | BRENABL), /* write 14 */
- 0 /* write 15 */
- };
- DECLARE_TASK_QUEUE(tq_zs_serial);
- struct tty_driver serial_driver, callout_driver;
- 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
- /*
- * Debugging.
- */
- #undef SERIAL_DEBUG_INTR
- #undef SERIAL_DEBUG_OPEN
- #undef SERIAL_DEBUG_FLOW
- #undef SERIAL_DEBUG_THROTTLE
- #undef SERIAL_PARANOIA_CHECK
- #undef ZS_DEBUG_REGS
- #ifdef SERIAL_DEBUG_THROTTLE
- #define _tty_name(tty,buf) tty_name(tty,buf)
- #endif
- #define RS_STROBE_TIME 10
- #define RS_ISR_PASS_LIMIT 256
- #define _INLINE_ inline
- static void probe_sccs(void);
- static void change_speed(struct dec_serial *info);
- static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
- static struct tty_struct *serial_table[NUM_CHANNELS];
- static struct termios *serial_termios[NUM_CHANNELS];
- static struct termios *serial_termios_locked[NUM_CHANNELS];
- #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[4096]; /* This is cheating */
- static DECLARE_MUTEX(tmp_buf_sem);
- static inline int serial_paranoia_check(struct dec_serial *info,
- dev_t device, const char *routine)
- {
- #ifdef SERIAL_PARANOIA_CHECK
- static const char *badmagic =
- "Warning: bad magic number for serial struct (%d, %d) in %sn";
- static const char *badinfo =
- "Warning: null mac_serial for (%d, %d) in %sn";
- 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 Z8530 registers.
- */
- static inline unsigned char read_zsreg(struct dec_zschannel *channel,
- unsigned char reg)
- {
- unsigned char retval;
- if (reg != 0) {
- *channel->control = reg & 0xf;
- wbflush(); RECOVERY_DELAY;
- }
- retval = *channel->control;
- RECOVERY_DELAY;
- return retval;
- }
- static inline void write_zsreg(struct dec_zschannel *channel,
- unsigned char reg, unsigned char value)
- {
- if (reg != 0) {
- *channel->control = reg & 0xf;
- wbflush(); RECOVERY_DELAY;
- }
- *channel->control = value;
- wbflush(); RECOVERY_DELAY;
- return;
- }
- static inline unsigned char read_zsdata(struct dec_zschannel *channel)
- {
- unsigned char retval;
- retval = *channel->data;
- RECOVERY_DELAY;
- return retval;
- }
- static inline void write_zsdata(struct dec_zschannel *channel,
- unsigned char value)
- {
- *channel->data = value;
- wbflush(); RECOVERY_DELAY;
- return;
- }
- static inline void load_zsregs(struct dec_zschannel *channel,
- unsigned char *regs)
- {
- /* ZS_CLEARERR(channel);
- ZS_CLEARFIFO(channel); */
- /* Load 'em up */
- write_zsreg(channel, R4, regs[R4]);
- write_zsreg(channel, R3, regs[R3] & ~RxENABLE);
- write_zsreg(channel, R5, regs[R5] & ~TxENAB);
- write_zsreg(channel, R9, regs[R9]);
- write_zsreg(channel, R1, regs[R1]);
- write_zsreg(channel, R2, regs[R2]);
- write_zsreg(channel, R10, regs[R10]);
- 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 dec_serial *info, int which, int set)
- {
- unsigned long flags;
- save_flags(flags); cli();
- if (info->zs_channel != info->zs_chan_a) {
- if (set) {
- info->zs_chan_a->curregs[5] |= (which & (RTS | DTR));
- } else {
- info->zs_chan_a->curregs[5] &= ~(which & (RTS | DTR));
- }
- write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]);
- }
- restore_flags(flags);
- }
- /* Utility routines for the Zilog */
- static inline int get_zsbaud(struct dec_serial *ss)
- {
- struct dec_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) << 8);
- brg |= read_zsreg(channel, 12);
- return BRG_TO_BPS(brg, (zs_parms->clock/(ss->clk_divisor)));
- }
- /* On receive, this clears errors and the receiver interrupts */
- static inline void rs_recv_clear(struct dec_zschannel *zsc)
- {
- write_zsreg(zsc, 0, ERR_RES);
- write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */
- }
- /*
- * ----------------------------------------------------------------------
- *
- * 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.
- *
- * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
- * -----------------------------------------------------------------------
- */
- static int tty_break; /* Set whenever BREAK condition is detected. */
- /*
- * 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 dec_serial *info,
- int event)
- {
- info->event |= 1 << event;
- queue_task(&info->tqueue, &tq_zs_serial);
- mark_bh(SERIAL_BH);
- }
- static _INLINE_ void receive_chars(struct dec_serial *info,
- struct pt_regs *regs)
- {
- struct tty_struct *tty = info->tty;
- unsigned char ch, stat, flag;
- while ((read_zsreg(info->zs_channel, R0) & Rx_CH_AV) != 0) {
- stat = read_zsreg(info->zs_channel, R1);
- ch = read_zsdata(info->zs_channel);
- if (!tty && !info->hook && !info->hook->rx_char)
- continue;
- if (tty_break) {
- tty_break = 0;
- #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && !defined(MODULE)
- if (info->line == sercons.index) {
- if (!break_pressed) {
- break_pressed = jiffies;
- goto ignore_char;
- }
- break_pressed = 0;
- }
- #endif
- flag = TTY_BREAK;
- if (info->flags & ZILOG_SAK)
- do_SAK(tty);
- } else {
- if (stat & Rx_OVR) {
- flag = TTY_OVERRUN;
- } else if (stat & FRM_ERR) {
- flag = TTY_FRAME;
- } else if (stat & PAR_ERR) {
- flag = TTY_PARITY;
- } else
- flag = 0;
- if (flag)
- /* reset the error indication */
- write_zsreg(info->zs_channel, R0, ERR_RES);
- }
- #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && !defined(MODULE)
- if (break_pressed && info->line == sercons.index) {
- if (ch != 0 &&
- time_before(jiffies, break_pressed + HZ*5)) {
- handle_sysrq(ch, regs, NULL, NULL);
- break_pressed = 0;
- goto ignore_char;
- }
- break_pressed = 0;
- }
- #endif
- if (info->hook && info->hook->rx_char) {
- (*info->hook->rx_char)(ch, flag);
- return;
- }
-
- if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
- static int flip_buf_ovf;
- ++flip_buf_ovf;
- continue;
- }
- tty->flip.count++;
- {
- static int flip_max_cnt;
- if (flip_max_cnt < tty->flip.count)
- flip_max_cnt = tty->flip.count;
- }
- *tty->flip.flag_buf_ptr++ = flag;
- *tty->flip.char_buf_ptr++ = ch;
- ignore_char:
- }
- if (tty)
- tty_flip_buffer_push(tty);
- }
- static void transmit_chars(struct dec_serial *info)
- {
- if ((read_zsreg(info->zs_channel, R0) & Tx_BUF_EMP) == 0)
- return;
- info->tx_active = 0;
- if (info->x_char) {
- /* Send next char */
- write_zsdata(info->zs_channel, info->x_char);
- info->x_char = 0;
- info->tx_active = 1;
- return;
- }
- if ((info->xmit_cnt <= 0) || (info->tty && info->tty->stopped)
- || info->tx_stopped) {
- write_zsreg(info->zs_channel, R0, RES_Tx_P);
- return;
- }
- /* Send char */
- write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]);
- info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
- info->xmit_cnt--;
- info->tx_active = 1;
- if (info->xmit_cnt < WAKEUP_CHARS)
- rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
- }
- static _INLINE_ void status_handle(struct dec_serial *info)
- {
- unsigned char stat;
- /* Get status from Read Register 0 */
- stat = read_zsreg(info->zs_channel, R0);
- if (stat & BRK_ABRT) {
- #ifdef SERIAL_DEBUG_INTR
- printk("handling break....");
- #endif
- tty_break = 1;
- }
- if (info->zs_channel != info->zs_chan_a) {
- /* FIXEM: Check for DCD transitions */
- if (((stat ^ info->read_reg_zero) & DCD) != 0
- && info->tty && !C_CLOCAL(info->tty)) {
- if (stat & DCD) {
- wake_up_interruptible(&info->open_wait);
- } else if (!(info->flags & ZILOG_CALLOUT_ACTIVE)) {
- tty_hangup(info->tty);
- }
- }
- /* Check for CTS transitions */
- if (info->tty && C_CRTSCTS(info->tty)) {
- if ((stat & CTS) != 0) {
- if (info->tx_stopped) {
- info->tx_stopped = 0;
- if (!info->tx_active)
- transmit_chars(info);
- }
- } else {
- info->tx_stopped = 1;
- }
- }
- }
- /* Clear status condition... */
- write_zsreg(info->zs_channel, R0, RES_EXT_INT);
- info->read_reg_zero = stat;
- }
- /*
- * This is the serial driver's generic interrupt routine
- */
- void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
- {
- struct dec_serial *info = (struct dec_serial *) dev_id;
- unsigned char zs_intreg;
- int shift;
- /* 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_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT)
- if (info->zs_chan_a == info->zs_channel)
- shift = 3; /* Channel A */
- else
- shift = 0; /* Channel B */
- for (;;) {
- zs_intreg = read_zsreg(info->zs_chan_a, R3) >> shift;
- if ((zs_intreg & CHAN_IRQMASK) == 0)
- break;
- if (zs_intreg & CHBRxIP) {
- receive_chars(info, regs);
- }
- if (zs_intreg & CHBTxIP) {
- transmit_chars(info);
- }
- if (zs_intreg & CHBEXT) {
- status_handle(info);
- }
- }
-
- /* Why do we need this ? */
- write_zsreg(info->zs_channel, 0, RES_H_IUS);
- }
- #ifdef ZS_DEBUG_REGS
- void zs_dump (void) {
- int i, j;
- for (i = 0; i < zs_channels_found; i++) {
- struct dec_zschannel *ch = &zs_channels[i];
- if ((long)ch->control == UNI_IO_BASE+UNI_SCC1A_CTRL) {
- for (j = 0; j < 15; j++) {
- printk("W%d = 0x%xt",
- j, (int)ch->curregs[j]);
- }
- for (j = 0; j < 15; j++) {
- printk("R%d = 0x%xt",
- j, (int)read_zsreg(ch,j));
- }
- printk("nn");
- }
- }
- }
- #endif
- /*
- * -------------------------------------------------------------------
- * Here ends the serial interrupt routines.
- * -------------------------------------------------------------------
- */
- /*
- * ------------------------------------------------------------
- * rs_stop() and rs_start()
- *
- * This routines are called before setting or resetting tty->stopped.
- * ------------------------------------------------------------
- */
- static void rs_stop(struct tty_struct *tty)
- {
- struct dec_serial *info = (struct dec_serial *)tty->driver_data;
- unsigned long flags;
- if (serial_paranoia_check(info, tty->device, "rs_stop"))
- return;
-
- #if 1
- save_flags(flags); cli();
- if (info->zs_channel->curregs[5] & TxENAB) {
- info->zs_channel->curregs[5] &= ~TxENAB;
- write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
- }
- restore_flags(flags);
- #endif
- }
- static void rs_start(struct tty_struct *tty)
- {
- struct dec_serial *info = (struct dec_serial *)tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->device, "rs_start"))
- return;
-
- save_flags(flags); cli();
- #if 1
- if (info->xmit_cnt && info->xmit_buf && !(info->zs_channel->curregs[5] & TxENAB)) {
- info->zs_channel->curregs[5] |= TxENAB;
- write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
- }
- #else
- if (info->xmit_cnt && info->xmit_buf && !info->tx_active) {
- transmit_chars(info);
- }
- #endif
- restore_flags(flags);
- }
- /*
- * 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_zs_serial);
- }
- static void do_softint(void *private_)
- {
- struct dec_serial *info = (struct dec_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);
- }
- }
- int zs_startup(struct dec_serial * info)
- {
- 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%02d (irq %d)...", info->line, info->irq);
- #endif
- /*
- * Clear the receive FIFO.
- */
- ZS_CLEARFIFO(info->zs_channel);
- info->xmit_fifo_size = 1;
- /*
- * Clear the interrupt registers.
- */
- write_zsreg(info->zs_channel, 0, ERR_RES);
- write_zsreg(info->zs_channel, 0, RES_H_IUS);
- /*
- * Turn on RTS and DTR.
- */
- zs_rtsdtr(info, RTS | DTR, 1);
- /*
- * Finally, enable sequencing and interrupts
- */
- info->zs_channel->curregs[1] = (info->zs_channel->curregs[1] & ~0x18) | (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB);
- info->zs_channel->curregs[3] |= (RxENABLE | Rx8);
- info->zs_channel->curregs[5] |= (TxENAB | Tx8);
- info->zs_channel->curregs[15] |= (DCDIE | CTSIE | TxUIE | BRKIE);
- info->zs_channel->curregs[9] |= (VIS | MIE);
- write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]);
- write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
- write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
- write_zsreg(info->zs_channel, 15, info->zs_channel->curregs[15]);
- write_zsreg(info->zs_channel, 9, info->zs_channel->curregs[9]);
- /*
- * And clear the interrupt registers again for luck.
- */
- write_zsreg(info->zs_channel, 0, ERR_RES);
- write_zsreg(info->zs_channel, 0, RES_H_IUS);
- if (info->tty)
- clear_bit(TTY_IO_ERROR, &info->tty->flags);
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
- /*
- * Set the speed of the serial port
- */
- change_speed(info);
- /* Save the current value of RR0 */
- info->read_reg_zero = read_zsreg(info->zs_channel, 0);
- 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 dec_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;
- }
- info->zs_channel->curregs[1] = 0;
- write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]); /* no interrupts */
- info->zs_channel->curregs[3] &= ~RxENABLE;
- write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
- info->zs_channel->curregs[5] &= ~TxENAB;
- write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
- if (!info->tty || C_HUPCL(info->tty)) {
- zs_rtsdtr(info, RTS | DTR, 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 dec_serial *info)
- {
- unsigned cflag;
- int i;
- int brg, bits;
- unsigned long flags;
- if (!info->hook) {
- if (!info->tty || !info->tty->termios)
- return;
- cflag = info->tty->termios->c_cflag;
- if (!info->port)
- return;
- } else {
- cflag = info->hook->cflags;
- }
- i = cflag & CBAUD;
- if (i & CBAUDEX) {
- i &= ~CBAUDEX;
- if (i < 1 || i > 2) {
- if (!info->hook)
- info->tty->termios->c_cflag &= ~CBAUDEX;
- else
- info->hook->cflags &= ~CBAUDEX;
- } else
- i += 15;
- }
- save_flags(flags); cli();
- info->zs_baud = baud_table[i];
- info->clk_divisor = 16;
- if (info->zs_baud) {
- info->zs_channel->curregs[4] = X16CLK;
- brg = BPS_TO_BRG(info->zs_baud, zs_parms->clock/info->clk_divisor);
- info->zs_channel->curregs[12] = (brg & 255);
- info->zs_channel->curregs[13] = ((brg >> 8) & 255);
- zs_rtsdtr(info, DTR, 1);
- } else {
- zs_rtsdtr(info, RTS | DTR, 0);
- return;
- }
- /* byte size and parity */
- info->zs_channel->curregs[3] &= ~RxNBITS_MASK;
- info->zs_channel->curregs[5] &= ~TxNBITS_MASK;
- switch (cflag & CSIZE) {
- case CS5:
- bits = 7;
- info->zs_channel->curregs[3] |= Rx5;
- info->zs_channel->curregs[5] |= Tx5;
- break;
- case CS6:
- bits = 8;
- info->zs_channel->curregs[3] |= Rx6;
- info->zs_channel->curregs[5] |= Tx6;
- break;
- case CS7:
- bits = 9;
- info->zs_channel->curregs[3] |= Rx7;
- info->zs_channel->curregs[5] |= Tx7;
- break;
- case CS8:
- default: /* defaults to 8 bits */
- bits = 10;
- info->zs_channel->curregs[3] |= Rx8;
- info->zs_channel->curregs[5] |= Tx8;
- break;
- }
- info->timeout = ((info->xmit_fifo_size*HZ*bits) / info->zs_baud);
- info->timeout += HZ/50; /* Add .02 seconds of slop */
- info->zs_channel->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN);
- if (cflag & CSTOPB) {
- info->zs_channel->curregs[4] |= SB2;
- } else {
- info->zs_channel->curregs[4] |= SB1;
- }
- if (cflag & PARENB) {
- info->zs_channel->curregs[4] |= PAR_ENA;
- }
- if (!(cflag & PARODD)) {
- info->zs_channel->curregs[4] |= PAR_EVEN;
- }
- if (!(cflag & CLOCAL)) {
- if (!(info->zs_channel->curregs[15] & DCDIE))
- info->read_reg_zero = read_zsreg(info->zs_channel, 0);
- info->zs_channel->curregs[15] |= DCDIE;
- } else
- info->zs_channel->curregs[15] &= ~DCDIE;
- if (cflag & CRTSCTS) {
- info->zs_channel->curregs[15] |= CTSIE;
- if ((read_zsreg(info->zs_channel, 0) & CTS) == 0)
- info->tx_stopped = 1;
- } else {
- info->zs_channel->curregs[15] &= ~CTSIE;
- info->tx_stopped = 0;
- }
- /* Load up the new values */
- load_zsregs(info->zs_channel, info->zs_channel->curregs);
- restore_flags(flags);
- }
- static void rs_flush_chars(struct tty_struct *tty)
- {
- struct dec_serial *info = (struct dec_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 || info->tx_stopped ||
- !info->xmit_buf)
- return;
- /* Enable transmitter */
- save_flags(flags); cli();
- transmit_chars(info);
- restore_flags(flags);
- }
- static int rs_write(struct tty_struct * tty, int from_user,
- const unsigned char *buf, int count)
- {
- int c, total = 0;
- struct dec_serial *info = (struct dec_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 && !info->tx_stopped
- && !info->tx_active)
- transmit_chars(info);
- restore_flags(flags);
- return total;
- }
- static int rs_write_room(struct tty_struct *tty)
- {
- struct dec_serial *info = (struct dec_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 dec_serial *info = (struct dec_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 dec_serial *info = (struct dec_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);
- }
- /*
- * ------------------------------------------------------------
- * 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 dec_serial *info = (struct dec_serial *)tty->driver_data;
- unsigned long flags;
- #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)) {
- save_flags(flags); cli();
- info->x_char = STOP_CHAR(tty);
- if (!info->tx_active)
- transmit_chars(info);
- restore_flags(flags);
- }
- if (C_CRTSCTS(tty)) {
- zs_rtsdtr(info, RTS, 0);
- }
- }
- static void rs_unthrottle(struct tty_struct * tty)
- {
- struct dec_serial *info = (struct dec_serial *)tty->driver_data;
- unsigned long flags;
- #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)) {
- save_flags(flags); cli();
- if (info->x_char)
- info->x_char = 0;
- else {
- info->x_char = START_CHAR(tty);
- if (!info->tx_active)
- transmit_chars(info);
- }
- restore_flags(flags);
- }
- if (C_CRTSCTS(tty)) {
- zs_rtsdtr(info, RTS, 1);
- }
- }
- /*
- * ------------------------------------------------------------
- * rs_ioctl() and friends
- * ------------------------------------------------------------
- */
- static int get_serial_info(struct dec_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));
- }
- static int set_serial_info(struct dec_serial * info,
- struct serial_struct * new_info)
- {
- struct serial_struct new_serial;
- struct dec_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 = zs_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 dec_serial * info, unsigned int *value)
- {
- unsigned char status;
- cli();
- status = read_zsreg(info->zs_channel, 0);
- sti();
- put_user(status,value);
- return 0;
- }
- static int get_modem_info(struct dec_serial *info, unsigned int *value)
- {
- unsigned char control, status_a, status_b;
- unsigned int result;
- if (info->zs_channel == info->zs_chan_a)
- result = 0;
- else {
- cli();
- control = info->zs_chan_a->curregs[5];
- status_a = read_zsreg(info->zs_chan_a, 0);
- status_b = read_zsreg(info->zs_channel, 0);
- sti();
- result = ((control & RTS) ? TIOCM_RTS: 0)
- | ((control & DTR) ? TIOCM_DTR: 0)
- | ((status_b & DCD) ? TIOCM_CAR: 0)
- | ((status_a & DCD) ? TIOCM_RNG: 0)
- | ((status_a & SYNC_HUNT) ? TIOCM_DSR: 0)
- | ((status_b & CTS) ? TIOCM_CTS: 0);
- }
- put_user(result, value);
- return 0;
- }
- static int set_modem_info(struct dec_serial *info, unsigned int cmd,
- unsigned int *value)
- {
- int error;
- unsigned int arg, bits;
- error = verify_area(VERIFY_READ, value, sizeof(int));
- if (error)
- return error;
- if (info->zs_channel == info->zs_chan_a)
- return 0;
- get_user(arg, value);
- bits = (arg & TIOCM_RTS? RTS: 0) + (arg & TIOCM_DTR? DTR: 0);
- cli();
- switch (cmd) {
- case TIOCMBIS:
- info->zs_chan_a->curregs[5] |= bits;
- break;
- case TIOCMBIC:
- info->zs_chan_a->curregs[5] &= ~bits;
- break;
- case TIOCMSET:
- info->zs_chan_a->curregs[5] =
- (info->zs_chan_a->curregs[5] & ~(DTR | RTS)) | bits;
- break;
- default:
- sti();
- return -EINVAL;
- }
- write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]);
- sti();
- return 0;
- }
- /*
- * rs_break - turn transmit break condition on/off
- */
- static void rs_break(struct tty_struct *tty, int break_state)
- {
- struct dec_serial *info = (struct dec_serial *) 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)
- info->zs_channel->curregs[5] |= SND_BRK;
- else
- info->zs_channel->curregs[5] &= ~SND_BRK;
- write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
- restore_flags(flags);
- }
- static int rs_ioctl(struct tty_struct *tty, struct file * file,
- unsigned int cmd, unsigned long arg)
- {
- int error;
- struct dec_serial * info = (struct dec_serial *)tty->driver_data;
- if (info->hook)
- return -ENODEV;
- if (serial_paranoia_check(info, tty->device, "rs_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 TIOCMGET:
- error = verify_area(VERIFY_WRITE, (void *) arg,
- sizeof(unsigned int));
- if (error)
- return error;
- 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:
- error = verify_area(VERIFY_WRITE, (void *) arg,
- sizeof(struct serial_struct));
- if (error)
- return error;
- 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 */
- error = verify_area(VERIFY_WRITE, (void *) arg,
- sizeof(unsigned int));
- if (error)
- return error;
- else
- return get_lsr_info(info, (unsigned int *) arg);
- case TIOCSERGSTRUCT:
- error = verify_area(VERIFY_WRITE, (void *) arg,
- sizeof(struct dec_serial));
- if (error)
- return error;
- copy_from_user((struct dec_serial *) arg,
- info, sizeof(struct dec_serial));
- return 0;
-
- default:
- return -ENOIOCTLCMD;
- }
- return 0;
- }
- static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
- {
- struct dec_serial *info = (struct dec_serial *)tty->driver_data;
- int was_stopped;
- if (tty->termios->c_cflag == old_termios->c_cflag)
- return;
- was_stopped = info->tx_stopped;
- change_speed(info);
- if (was_stopped && !info->tx_stopped)
- rs_start(tty);
- }
- /*
- * ------------------------------------------------------------
- * rs_close()
- *
- * This routine is called when the serial port gets closed.
- * Wait for the last remaining data to be sent.
- * ------------------------------------------------------------
- */
- static void rs_close(struct tty_struct *tty, struct file * filp)
- {
- struct dec_serial * info = (struct dec_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%02d, count = %dn", 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 %dn", info->count);
- info->count = 1;
- }
- if (--info->count < 0) {
- printk("rs_close: bad serial port count for ttyS%02d: %dn",
- 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 receiver and receive interrupts.
- */
- info->zs_channel->curregs[3] &= ~RxENABLE;
- write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
- info->zs_channel->curregs[1] = 0; /* disable any rx ints */
- write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]);
- ZS_CLEARFIFO(info->zs_channel);
- if (info->flags & ZILOG_INITIALIZED) {
- /*
- * Before we drop DTR, make sure the SCC transmitter
- * has completely drained.
- */
- 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 &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE|
- ZILOG_CLOSING);
- wake_up_interruptible(&info->close_wait);
- 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 dec_serial *info = (struct dec_serial *) tty->driver_data;
- unsigned long orig_jiffies, char_time;
- if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
- return;
- 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.
- */
- 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);
- while ((read_zsreg(info->zs_channel, 1) & Tx_BUF_EMP) == 0) {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(char_time);
- if (signal_pending(current))
- break;
- if (timeout && ((orig_jiffies + timeout) < jiffies))
- break;
- }
- current->state = TASK_RUNNING;
- }
- /*
- * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
- */
- void rs_hangup(struct tty_struct *tty)
- {
- struct dec_serial * info = (struct dec_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 dec_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
- return ((info->flags & ZILOG_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 & 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%02d, count = %dn",
- info->line, info->count);
- #endif
- cli();
- if (!tty_hung_up_p(filp))
- info->count--;
- sti();
- info->blocked_open++;
- while (1) {
- cli();
- if (!(info->flags & ZILOG_CALLOUT_ACTIVE) &&
- (tty->termios->c_cflag & CBAUD))
- zs_rtsdtr(info, RTS | DTR, 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 || (read_zsreg(info->zs_channel, 0) & DCD)))
- break;
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
- #ifdef SERIAL_DEBUG_OPEN
- printk("block_til_ready blocking: ttyS%02d, count = %dn",
- 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%02d, count = %dn",
- 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 dec_serial *info;
- int retval, line;
- line = MINOR(tty->device) - tty->driver.minor_start;
- if ((line < 0) || (line >= zs_channels_found))
- return -ENODEV;
- info = zs_soft + line;
- if (info->hook)
- return -ENODEV;
- if (serial_paranoia_check(info, tty->device, "rs_open"))
- return -ENODEV;
- #ifdef SERIAL_DEBUG_OPEN
- printk("rs_open %s%d, count = %dn", tty->driver.name, info->line,
- info->count);
- #endif
- info->count++;
- tty->driver_data = info;
- info->tty = tty;
- /*
- * If the port is the middle of closing, bail out now
- */
- if (tty_hung_up_p(filp) ||
- (info->flags & ZILOG_CLOSING)) {
- if (info->flags & ZILOG_CLOSING)
- interruptible_sleep_on(&info->close_wait);
- #ifdef SERIAL_DO_RESTART
- return ((info->flags & ZILOG_HUP_NOTIFY) ?
- -EAGAIN : -ERESTARTSYS);
- #else
- return -EAGAIN;
- #endif
- }
- /*
- * Start up serial port
- */
- retval = zs_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 %dn",
- 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);
- }
- #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
- printk("rs_open ttyS%02d successful...", info->line);
- #endif
- /* tty->low_latency = 1; */
- return 0;
- }
- /* Finally, routines used to initialize the serial driver. */
- static void __init show_serial_version(void)
- {
- printk("DECstation Z8530 serial driver version 0.05n");
- }
- /* Initialize Z8530s zs_channels
- */
- static void __init probe_sccs(void)
- {
- struct dec_serial **pp;
- int i, n, n_chips = 0, n_channels, chip, channel;
- /*
- * did we get here by accident?
- */
- if(!BUS_PRESENT) {
- printk("Not on JUNKIO machine, skipping probe_sccsn");
- return;
- }
-
- /*
- * When serial console is activated, tc_init has not been called yet
- * and system_base is undefined. Unfortunately we have to hardcode
- * system_base for this case :-(. HK
- */
- switch(mips_machtype) {
- #ifdef CONFIG_DECSTATION
- case MACH_DS5000_2X0:
- system_base = 0xbf800000;
- n_chips = 2;
- zs_parms = &ds_parms;
- break;
- case MACH_DS5000_1XX:
- system_base = 0xbc000000;
- n_chips = 2;
- zs_parms = &ds_parms;
- break;
- case MACH_DS5000_XX:
- system_base = 0xbc000000;
- n_chips = 1;
- zs_parms = &ds_parms;
- break;
- #endif
- #ifdef CONFIG_BAGET_MIPS
- case MACH_BAGET202:
- system_base = UNI_IO_BASE;
- n_chips = 2;
- zs_parms = &baget_parms;
- zs_init_regs[2] = 0x8;
- break;
- #endif
- default:
- panic("zs: unsupported bus");
- }
- if (!zs_parms)
- panic("zs: uninitialized parms");
- pp = &zs_chain;
- n_channels = 0;
- for (chip = 0; chip < n_chips; chip++) {
- for (channel = 0; channel <= 1; channel++) {
- /*
- * The sccs reside on the high byte of the 16 bit IOBUS
- */
- zs_channels[n_channels].control =
- (volatile unsigned char *)system_base +
- (0 == chip ? zs_parms->scc0 : zs_parms->scc1) +
- (0 == channel ? zs_parms->channel_a_offset :
- zs_parms->channel_b_offset);
- zs_channels[n_channels].data =
- zs_channels[n_channels].control + 4;
- #ifndef CONFIG_SERIAL_CONSOLE
- /*
- * We're called early and memory managment isn't up, yet.
- * Thus check_region would fail.
- */
- if (check_region((unsigned long)
- zs_channels[n_channels].control,
- ZS_CHAN_IO_SIZE) < 0) {
- panic("SCC I/O region is not free");
- }
- request_region((unsigned long)
- zs_channels[n_channels].control,
- ZS_CHAN_IO_SIZE, "SCC");
- #endif
- zs_soft[n_channels].zs_channel = &zs_channels[n_channels];
- zs_soft[n_channels].irq = zs_parms->irq;
- /*
- * Identification of channel A. Location of channel A
- * inside chip depends on mapping of internal address
- * the chip decodes channels by.
- * CHANNEL_A_NR returns either 0 (in case of
- * DECstations) or 1 (in case of Baget).
- */
- if (CHANNEL_A_NR == channel)
- zs_soft[n_channels].zs_chan_a =
- &zs_channels[n_channels+1-2*CHANNEL_A_NR];
- else
- zs_soft[n_channels].zs_chan_a =
- &zs_channels[n_channels];
- *pp = &zs_soft[n_channels];
- pp = &zs_soft[n_channels].zs_next;
- n_channels++;
- }
- }
- *pp = 0;
- zs_channels_found = n_channels;
- for (n = 0; n < zs_channels_found; n++) {
- for (i = 0; i < 16; i++) {
- zs_soft[n].zs_channel->curregs[i] = zs_init_regs[i];
- }
- }
- /* save_and_cli(flags);
- for (n = 0; n < zs_channels_found; n++) {
- if (((int)zs_channels[n].control & 0xf) == 1) {
- write_zsreg(zs_soft[n].zs_chan_a, R9, FHWRES);
- mdelay(10);
- write_zsreg(zs_soft[n].zs_chan_a, R9, 0);
- }
- load_zsregs(zs_soft[n].zs_channel, zs_soft[n].zs_channel->curregs);
- }
- restore_flags(flags); */
- }
- /* zs_init inits the driver */
- int __init zs_init(void)
- {
- int channel, i;
- unsigned long flags;
- struct dec_serial *info;
- if(!BUS_PRESENT)
- return -ENODEV;
- /* Setup base handler, and timer table. */
- init_bh(SERIAL_BH, do_serial_bh);
- /* Find out how many Z8530 SCCs we have */
- if (zs_chain == 0)
- probe_sccs();
- show_serial_version();
- /* Initialize the tty_driver structure */
- /* Not all of this is exactly right for us. */
- memset(&serial_driver, 0, sizeof(struct tty_driver));
- serial_driver.magic = TTY_DRIVER_MAGIC;
- #if (LINUX_VERSION_CODE > 0x2032D && defined(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 = zs_channels_found;
- 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 | TTY_DRIVER_NO_DEVFS;
- 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;
- serial_driver.break_ctl = rs_break;
- serial_driver.wait_until_sent = rs_wait_until_sent;
- /*
- * The callout device is just like normal device except for
- * major number and the subtype code.
- */
- callout_driver = serial_driver;
- #if (LINUX_VERSION_CODE > 0x2032D && defined(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 drivern");
- if (tty_register_driver(&callout_driver))
- panic("Couldn't register callout drivern");
- save_flags(flags); cli();
- for (channel = 0; channel < zs_channels_found; ++channel) {
- if (zs_soft[channel].hook &&
- zs_soft[channel].hook->init_channel)
- (*zs_soft[channel].hook->init_channel)
- (&zs_soft[channel]);
- zs_soft[channel].clk_divisor = 16;
- zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
- if (request_irq(zs_parms->irq, rs_interrupt, SA_SHIRQ,
- "SCC", &zs_soft[channel]))
- printk(KERN_ERR "decserial: can't get irq %dn",
- zs_parms->irq);
- }
- for (info = zs_chain, i = 0; info; info = info->zs_next, i++)
- {
- if (info->hook && info->hook->init_info) {
- (*info->hook->init_info)(info);
- continue;
- }
- info->magic = SERIAL_MAGIC;
- info->port = (int) info->zs_channel->control;
- info->line = i;
- info->tty = 0;
- 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->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("ttyS%02d at 0x%08x (irq = %d)", info->line,
- info->port, info->irq);
- printk(" is a Z85C30 SCCn");
- tty_register_devfs(&serial_driver, 0,
- serial_driver.minor_start + info->line);
- tty_register_devfs(&callout_driver, 0,
- callout_driver.minor_start + info->line);
- }
- restore_flags(flags);
- return 0;
- }
- /*
- * register_serial and unregister_serial allows for serial ports to be
- * configured at run-time, to support PCMCIA modems.
- */
- /* PowerMac: 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;
- }
- /*
- * polling I/O routines
- */
- static int
- zs_poll_tx_char(struct dec_serial *info, unsigned char ch)
- {
- struct dec_zschannel *chan = info->zs_channel;
- int ret;
- if(chan) {
- int loops = 10000;
- // int nine = read_zsreg(chan, R9);
- RECOVERY_DELAY;
- // write_zsreg(chan, R9, nine & ~MIE);
- wbflush();
- RECOVERY_DELAY;
- while (!(*(chan->control) & Tx_BUF_EMP) && --loops)
- RECOVERY_DELAY;
- if (loops) {
- ret = 0;
- *(chan->data) = ch;
- wbflush();
- RECOVERY_DELAY;
- } else
- ret = -EAGAIN;
- // write_zsreg(chan, R9, nine);
- wbflush();
- RECOVERY_DELAY;
- return ret;
- }
- return -ENODEV;
- }
- static int
- zs_poll_rx_char(struct dec_serial *info)
- {
- struct dec_zschannel *chan = info->zs_channel;
- int ret;
- if(chan) {
- int loops = 10000;
- while((read_zsreg(chan, 0) & Rx_CH_AV) == 0)
- loops--;
- if (loops)
- ret = read_zsdata(chan);
- else
- ret = -EAGAIN;
- return ret;
- } else
- return -ENODEV;
- }
- unsigned int register_zs_hook(unsigned int channel, struct zs_hook *hook)
- {
- struct dec_serial *info = &zs_soft[channel];
- if (info->hook) {
- printk(__FUNCTION__": line %d has already a hook registeredn", channel);
- return 0;
- } else {
- info->hook = hook;
- if (zs_chain == 0)
- probe_sccs();
- if (!(info->flags & ZILOG_INITIALIZED))
- zs_startup(info);
- hook->poll_rx_char = zs_poll_rx_char;
- hook->poll_tx_char = zs_poll_tx_char;
- return 1;
- }
- }
- unsigned int unregister_zs_hook(unsigned int channel)
- {
- struct dec_serial *info = &zs_soft[channel];
- if (info->hook) {
- info->hook = NULL;
- return 1;
- } else {
- printk(__FUNCTION__": trying to unregister hook on line %d,"
- " but none is registeredn", channel);
- return 0;
- }
- }
- /*
- * ------------------------------------------------------------
- * Serial console driver
- * ------------------------------------------------------------
- */
- #ifdef CONFIG_SERIAL_CONSOLE
- /*
- * 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 dec_serial *info;
- int i;
- info = zs_soft + co->index;
- for (i = 0; i < count; i++, s++) {
- if(*s == 'n')
- zs_poll_tx_char(info, 'r');
- zs_poll_tx_char(info, *s);
- }
- }
- /*
- * Receive character from the serial port
- */
- static int serial_console_wait_key(struct console *co)
- {
- struct dec_serial *info;
- info = zs_soft + co->index;
- return zs_poll_rx_char(info);
- }
- 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 dec_serial *info;
- int baud = 9600;
- int bits = 8;
- int parity = 'n';
- int cflag = CREAD | HUPCL | CLOCAL;
- char *s;
- unsigned long flags;
- if(!BUS_PRESENT)
- return -ENODEV;
- info = zs_soft + co->index;
- if (zs_chain == 0)
- probe_sccs();
- info->is_cons = 1;
- 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;
- #if 1
- save_and_cli(flags);
- /*
- * Turn on RTS and DTR.
- */
- zs_rtsdtr(info, RTS | DTR, 1);
- /*
- * Finally, enable sequencing
- */
- info->zs_channel->curregs[3] |= (RxENABLE | Rx8);
- info->zs_channel->curregs[5] |= (TxENAB | Tx8);
- info->zs_channel->curregs[9] |= (VIS);
- write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
- write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
- write_zsreg(info->zs_channel, 9, info->zs_channel->curregs[9]);
- /*
- * Clear the interrupt registers.
- */
- write_zsreg(info->zs_channel, 0, ERR_RES);
- write_zsreg(info->zs_channel, 0, RES_H_IUS);
- /*
- * Set the speed of the serial port
- */
- change_speed(info);
- /* Save the current value of RR0 */
- info->read_reg_zero = read_zsreg(info->zs_channel, 0);
- zs_soft[co->index].clk_divisor = 16;
- zs_soft[co->index].zs_baud = get_zsbaud(&zs_soft[co->index]);
- restore_flags(flags);
- #endif
- return 0;
- }
- static struct console sercons = {
- name: "ttyS",
- write: serial_console_write,
- device: serial_console_device,
- wait_key: serial_console_wait_key,
- setup: serial_console_setup,
- flags: CON_PRINTBUFFER,
- index: -1,
- };
- /*
- * Register console.
- */
- void __init zs_serial_console_init(void)
- {
- register_console(&sercons);
- }
- #endif /* ifdef CONFIG_SERIAL_CONSOLE */
- #ifdef CONFIG_KGDB
- struct dec_zschannel *zs_kgdbchan;
- static unsigned char scc_inittab[] = {
- 9, 0x80, /* reset A side (CHRA) */
- 13, 0, /* set baud rate divisor */
- 12, 1,
- 14, 1, /* baud rate gen enable, src=rtxc (BRENABL) */
- 11, 0x50, /* clocks = br gen (RCBR | TCBR) */
- 5, 0x6a, /* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */
- 4, 0x44, /* x16 clock, 1 stop (SB1 | X16CLK)*/
- 3, 0xc1, /* rx enable, 8 bits (RxENABLE | Rx8)*/
- };
- /* These are for receiving and sending characters under the kgdb
- * source level kernel debugger.
- */
- void putDebugChar(char kgdb_char)
- {
- struct dec_zschannel *chan = zs_kgdbchan;
- while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0)
- RECOVERY_DELAY;
- write_zsdata(chan, kgdb_char);
- }
- char getDebugChar(void)
- {
- struct dec_zschannel *chan = zs_kgdbchan;
- while((read_zsreg(chan, 0) & Rx_CH_AV) == 0)
- eieio(); /*barrier();*/
- return read_zsdata(chan);
- }
- void kgdb_interruptible(int yes)
- {
- struct dec_zschannel *chan = zs_kgdbchan;
- int one, nine;
- nine = read_zsreg(chan, 9);
- if (yes == 1) {
- one = EXT_INT_ENAB|INT_ALL_Rx;
- nine |= MIE;
- printk("turning serial ints onn");
- } else {
- one = RxINT_DISAB;
- nine &= ~MIE;
- printk("turning serial ints offn");
- }
- write_zsreg(chan, 1, one);
- write_zsreg(chan, 9, nine);
- }
- static int kgdbhook_init_channel(struct dec_serial* info)
- {
- return 0;
- }
- static void kgdbhook_init_info(struct dec_serial* info)
- {
- }
- static void kgdbhook_rx_char(struct dec_serial* info,
- unsigned char ch, unsigned char stat)
- {
- if (ch == 0x03 || ch == '$')
- breakpoint();
- if (stat & (Rx_OVR|FRM_ERR|PAR_ERR))
- write_zsreg(info->zs_channel, 0, ERR_RES);
- }
- /* This sets up the serial port we're using, and turns on
- * interrupts for that channel, so kgdb is usable once we're done.
- */
- static inline void kgdb_chaninit(struct dec_zschannel *ms, int intson, int bps)
- {
- int brg;
- int i, x;
- volatile char *sccc = ms->control;
- brg = BPS_TO_BRG(bps, zs_parms->clock/16);
- printk("setting bps on kgdb line to %d [brg=%x]n", bps, brg);
- for (i = 20000; i != 0; --i) {
- x = *sccc; eieio();
- }
- for (i = 0; i < sizeof(scc_inittab); ++i) {
- write_zsreg(ms, scc_inittab[i], scc_inittab[i+1]);
- i++;
- }
- }
- /* This is called at boot time to prime the kgdb serial debugging
- * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1
- * for /dev/ttyb which is determined in setup_arch() from the
- * boot command line flags.
- */
- struct zs_hook zs_kgdbhook = {
- init_channel : kgdbhook_init_channel,
- init_info : kgdbhook_init_info,
- cflags : B38400|CS8|CLOCAL,
- rx_char : kgdbhook_rx_char,
- }
- void __init zs_kgdb_hook(int tty_num)
- {
- /* Find out how many Z8530 SCCs we have */
- if (zs_chain == 0)
- probe_sccs();
- 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 = 38400;
- zs_soft[tty_num].hook = &zs_kgdbhook; /* This runs kgdb */
- /* Turn on transmitter/receiver at 8-bits/char */
- kgdb_chaninit(zs_soft[tty_num].zs_channel, 1, 38400);
- printk("KGDB: on channel %d initializedn", tty_num);
- set_debug_traps(); /* init stub */
- }
- #endif /* ifdef CONFIG_KGDB */