zs.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:74k
- /* $Id: zs.c,v 1.68.2.2 2002/01/12 07:04:33 davem Exp $
- * zs.c: Zilog serial port driver for the Sparc.
- *
- * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
- * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
- * Fixes by Pete A. Zaitcev <zaitcev@yahoo.com>.
- *
- * Fixed to use tty_get_baud_rate().
- * Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
- *
- * /proc/tty/driver/serial now exists and is readable.
- * Alex Buell <alex.buell@tahallah.demon.co.uk>, 2001-12-23
- *
- */
- #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/config.h>
- #include <linux/major.h>
- #include <linux/string.h>
- #include <linux/fcntl.h>
- #include <linux/mm.h>
- #include <linux/kernel.h>
- #include <linux/keyboard.h>
- #include <linux/console.h>
- #include <linux/delay.h>
- #include <linux/init.h>
- #include <linux/bootmem.h>
- #include <linux/sysrq.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/oplib.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include <asm/bitops.h>
- #include <asm/kdebug.h>
- #include <asm/page.h>
- #include <asm/pgtable.h>
- #include <asm/sbus.h>
- #ifdef __sparc_v9__
- #include <asm/fhc.h>
- #endif
- #ifdef CONFIG_PCI
- #include <linux/pci.h>
- #endif
- #include "sunserial.h"
- #include "zs.h"
- #include "sunkbd.h"
- #include "sunmouse.h"
- static int num_serial = 2; /* sun4/sun4c/sun4m - Two chips on board. */
- #define NUM_SERIAL num_serial
- #define NUM_CHANNELS (NUM_SERIAL * 2)
- #define KEYBOARD_LINE 0x2
- #define MOUSE_LINE 0x3
- /* On 32-bit sparcs we need to delay after register accesses
- * to accomodate sun4 systems, but we do not need to flush writes.
- * On 64-bit sparc we only need to flush single writes to ensure
- * completion.
- */
- #ifndef __sparc_v9__
- #define ZSDELAY() udelay(5)
- #define ZSDELAY_LONG() udelay(20)
- #define ZS_WSYNC(channel) do { } while(0)
- #else
- #define ZSDELAY()
- #define ZSDELAY_LONG()
- #define ZS_WSYNC(__channel)
- sbus_readb(&((__channel)->control))
- #endif
- struct sun_zslayout **zs_chips;
- struct sun_zschannel **zs_channels;
- struct sun_zschannel *zs_mousechan;
- struct sun_zschannel *zs_kbdchan;
- struct sun_zschannel *zs_kgdbchan;
- int *zs_nodes;
- struct sun_serial *zs_soft;
- struct sun_serial *zs_chain; /* IRQ servicing chain */
- int zilog_irq;
- struct tty_struct *zs_ttys;
- /* Console hooks... */
- #ifdef CONFIG_SERIAL_CONSOLE
- static struct console zs_console;
- static int zs_console_init(void);
- /*
- * Define this to get the zs_fair_output() functionality.
- */
- #undef SERIAL_CONSOLE_FAIR_OUTPUT
- #endif /* CONFIG_SERIAL_CONSOLE */
- static unsigned char kgdb_regs[16] = {
- 0, 0, 0, /* write 0, 1, 2 */
- (Rx8 | RxENAB), /* write 3 */
- (X16CLK | SB1 | PAR_EVEN), /* write 4 */
- (DTR | Tx8 | TxENAB), /* write 5 */
- 0, 0, 0, /* write 6, 7, 8 */
- (NV), /* write 9 */
- (NRZ), /* write 10 */
- (TCBR | RCBR), /* write 11 */
- 0, 0, /* BRG time constant, write 12 + 13 */
- (BRSRC | BRENAB), /* write 14 */
- (DCDIE) /* write 15 */
- };
- static unsigned char zscons_regs[16] = {
- 0, /* write 0 */
- (EXT_INT_ENAB | INT_ALL_Rx), /* write 1 */
- 0, /* write 2 */
- (Rx8 | RxENAB), /* write 3 */
- (X16CLK), /* write 4 */
- (DTR | Tx8 | TxENAB), /* write 5 */
- 0, 0, 0, /* write 6, 7, 8 */
- (NV | MIE), /* write 9 */
- (NRZ), /* write 10 */
- (TCBR | RCBR), /* write 11 */
- 0, 0, /* BRG time constant, write 12 + 13 */
- (BRSRC | BRENAB), /* write 14 */
- (DCDIE | CTSIE | TxUIE | BRKIE) /* write 15 */
- };
- #define ZS_CLOCK 4915200 /* Zilog input clock rate */
- DECLARE_TASK_QUEUE(tq_serial);
- static 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
- #define SERIAL_DO_RESTART
- /* Debugging... DEBUG_INTR is bad to use when one of the zs
- * lines is your console ;(
- */
- #undef SERIAL_DEBUG_INTR
- #undef SERIAL_DEBUG_OPEN
- #undef SERIAL_DEBUG_FLOW
- #define RS_STROBE_TIME 10
- #define RS_ISR_PASS_LIMIT 256
- #define _INLINE_ inline
- int zs_init(void);
- static void zs_kgdb_hook(int);
- static void change_speed(struct sun_serial *info);
- static struct tty_struct **serial_table;
- static struct termios **serial_termios;
- static struct termios **serial_termios_locked;
- #ifndef MIN
- #define MIN(a,b) ((a) < (b) ? (a) : (b))
- #endif
- #undef ZS_LOG
- #ifdef ZS_LOG
- struct zs_logent {
- u8 reg, val;
- u8 write, __pad;
- #define REGIRQ 0xff
- #define REGDATA 0xfe
- #define REGCTRL 0xfd
- };
- struct zs_logent zslog[32];
- int zs_curlog;
- #define ZSLOG(__reg, __val, __write)
- do{ int index = zs_curlog;
- zslog[index].reg = (__reg);
- zslog[index].val = (__val);
- zslog[index].write = (__write);
- zs_curlog = (index + 1) & (32 - 1);
- }while(0)
- int zs_dumplog(char *buffer)
- {
- int len = 0;
- int i;
- for (i = 0; i < 32; i++) {
- u8 reg, val, write;
- reg = zslog[i].reg;
- val = zslog[i].val;
- write = zslog[i].write;
- len += sprintf(buffer + len,
- "ZSLOG[%2d]: reg %2x val %2x %sn",
- i, reg, val, write ? "write" : "read");
- }
- len += sprintf(buffer + len, "ZS current log index %dn",
- zs_curlog);
- return len;
- }
- #else
- #define ZSLOG(x,y,z) do { } while (0)
- #endif
- /*
- * tmp_buf is used as a temporary buffer by serial_write. We need to
- * lock it in case the memcpy_fromfs blocks while swapping in a page,
- * and some other program tries to do a serial write at the same time.
- * Since the lock will only come under contention when the system is
- * swapping and available memory is low, it makes sense to share one
- * buffer across all the serial ports, since it significantly saves
- * memory if large numbers of serial ports are open.
- */
- static unsigned char *tmp_buf = 0;
- static DECLARE_MUTEX(tmp_buf_sem);
- static inline int serial_paranoia_check(struct sun_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 sun_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;
- }
- /* Reading and writing Zilog8530 registers. The delays are to make this
- * driver work on the Sun4 which needs a settling delay after each chip
- * register access, other machines handle this in hardware via auxiliary
- * flip-flops which implement the settle time we do in software.
- */
- static unsigned char read_zsreg(struct sun_zschannel *channel,
- unsigned char reg)
- {
- unsigned char retval;
- sbus_writeb(reg, &channel->control);
- ZSDELAY();
- retval = sbus_readb(&channel->control);
- ZSDELAY();
- ZSLOG(reg, retval, 0);
- return retval;
- }
- static void write_zsreg(struct sun_zschannel *channel,
- unsigned char reg, unsigned char value)
- {
- ZSLOG(reg, value, 1);
- sbus_writeb(reg, &channel->control);
- ZSDELAY();
- sbus_writeb(value, &channel->control);
- ZSDELAY();
- }
- static void load_zsregs(struct sun_serial *info, unsigned char *regs)
- {
- struct sun_zschannel *channel = info->zs_channel;
- unsigned long flags;
- unsigned char stat;
- int i;
- for (i = 0; i < 1000; i++) {
- stat = read_zsreg(channel, R1);
- if (stat & ALL_SNT)
- break;
- udelay(100);
- }
- write_zsreg(channel, R3, 0);
- ZS_CLEARSTAT(channel);
- ZS_CLEARERR(channel);
- ZS_CLEARFIFO(channel);
- /* Load 'em up */
- save_flags(flags); cli();
- if (info->channelA)
- write_zsreg(channel, R9, CHRA);
- else
- write_zsreg(channel, R9, CHRB);
- ZSDELAY_LONG();
- write_zsreg(channel, R4, regs[R4]);
- write_zsreg(channel, R3, regs[R3] & ~RxENAB);
- write_zsreg(channel, R5, regs[R5] & ~TxENAB);
- write_zsreg(channel, R9, regs[R9] & ~MIE);
- 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] & ~BRENAB);
- write_zsreg(channel, R14, regs[R14]);
- write_zsreg(channel, R14, (regs[R14] & ~SNRZI) | BRENAB);
- write_zsreg(channel, R3, regs[R3]);
- write_zsreg(channel, R5, regs[R5]);
- write_zsreg(channel, R15, regs[R15]);
- write_zsreg(channel, R0, RES_EXT_INT);
- write_zsreg(channel, R0, ERR_RES);
- write_zsreg(channel, R1, regs[R1]);
- write_zsreg(channel, R9, regs[R9]);
- restore_flags(flags);
- }
- #define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
- static void zs_put_char(struct sun_zschannel *channel, char ch)
- {
- int loops = ZS_PUT_CHAR_MAX_DELAY;
- /* Do not change this to use ZSDELAY as this is
- * a timed polling loop and on sparc64 ZSDELAY
- * is a nop. -DaveM
- */
- do {
- u8 val = sbus_readb(&channel->control);
- ZSLOG(REGCTRL, val, 0);
- if (val & Tx_BUF_EMP)
- break;
- udelay(5);
- } while (--loops);
- sbus_writeb(ch, &channel->data);
- ZSDELAY();
- ZS_WSYNC(channel);
- ZSLOG(REGDATA, ch, 1);
- }
- /* Sets or clears DTR/RTS on the requested line */
- static void zs_rtsdtr(struct sun_serial *ss, int set)
- {
- unsigned long flags;
- save_flags(flags); cli();
- if(set) {
- ss->curregs[5] |= (RTS | DTR);
- write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
- } else {
- ss->curregs[5] &= ~(RTS | DTR);
- write_zsreg(ss->zs_channel, 5, ss->curregs[5]);
- }
- restore_flags(flags);
- return;
- }
- static void kgdb_chaninit(struct sun_serial *ss, int intson, int bps)
- {
- int brg;
- if(intson) {
- kgdb_regs[R1] = INT_ALL_Rx;
- kgdb_regs[R9] |= MIE;
- } else {
- kgdb_regs[R1] = 0;
- kgdb_regs[R9] &= ~MIE;
- }
- brg = BPS_TO_BRG(bps, ZS_CLOCK/16);
- kgdb_regs[R12] = (brg & 255);
- kgdb_regs[R13] = ((brg >> 8) & 255);
- load_zsregs(ss, kgdb_regs);
- }
- /*
- * ------------------------------------------------------------
- * zs_stop() and zs_start()
- *
- * This routines are called before setting or resetting tty->stopped.
- * They enable or disable transmitter interrupts, as necessary.
- * ------------------------------------------------------------
- */
- static void zs_stop(struct tty_struct *tty)
- {
- struct sun_serial *info = (struct sun_serial *) tty->driver_data;
- unsigned long flags;
- if (serial_paranoia_check(info, tty->device, "zs_stop"))
- return;
-
- save_flags(flags); cli();
- if (info->curregs[5] & TxENAB) {
- info->curregs[5] &= ~TxENAB;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- }
- restore_flags(flags);
- }
- static void zs_start(struct tty_struct *tty)
- {
- struct sun_serial *info = (struct sun_serial *) tty->driver_data;
- unsigned long flags;
-
- if (serial_paranoia_check(info, tty->device, "zs_start"))
- return;
-
- save_flags(flags); cli();
- if (info->xmit_cnt && info->xmit_buf && !(info->curregs[5] & TxENAB)) {
- info->curregs[5] |= TxENAB;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- }
- restore_flags(flags);
- }
- /* Drop into either the boot monitor or kadb upon receiving a break
- * from keyboard/console input.
- */
- void batten_down_hatches(void)
- {
- if (!stop_a_enabled)
- return;
- /* If we are doing kadb, we call the debugger
- * else we just drop into the boot monitor.
- * Note that we must flush the user windows
- * first before giving up control.
- */
- printk("n");
- flush_user_windows();
- #ifndef __sparc_v9__
- if((((unsigned long)linux_dbvec)>=DEBUG_FIRSTVADDR) &&
- (((unsigned long)linux_dbvec)<=DEBUG_LASTVADDR))
- sp_enter_debugger();
- else
- #endif
- prom_cmdline();
- /* XXX We want to notify the keyboard driver that all
- * XXX keys are in the up state or else weird things
- * XXX happen...
- */
- return;
- }
- /*
- * ----------------------------------------------------------------------
- *
- * Here starts the interrupt handling routines. All of the following
- * subroutines are declared as inline and are folded into
- * zs_interrupt(). They were separated out for readability's sake.
- *
- * Note: zs_interrupt() is a "fast" interrupt, which means that it
- * runs with interrupts turned off. People who may want to modify
- * zs_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 void zs_sched_event(struct sun_serial *info, int event)
- {
- info->event |= 1 << event;
- queue_task(&info->tqueue, &tq_serial);
- mark_bh(SERIAL_BH);
- }
- #ifndef __sparc_v9__
- extern void breakpoint(void); /* For the KGDB frame character */
- #endif
- static void receive_chars(struct sun_serial *info, struct pt_regs *regs)
- {
- struct tty_struct *tty = info->tty;
- int do_queue_task = 0;
- while (1) {
- unsigned char ch, r1;
- r1 = read_zsreg(info->zs_channel, R1);
- if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
- sbus_writeb(ERR_RES, &info->zs_channel->control);
- ZSDELAY();
- ZS_WSYNC(info->zs_channel);
- ZSLOG(REGCTRL, ERR_RES, 1);
- }
- ch = sbus_readb(&info->zs_channel->data);
- ZSLOG(REGDATA, ch, 0);
- ch &= info->parity_mask;
- ZSDELAY();
- /* If this is the console keyboard, we need to handle
- * L1-A's here.
- */
- if (info->cons_keyb) {
- if (ch == SUNKBD_RESET) {
- l1a_state.kbd_id = 1;
- l1a_state.l1_down = 0;
- } else if (l1a_state.kbd_id) {
- l1a_state.kbd_id = 0;
- } else if (ch == SUNKBD_L1) {
- l1a_state.l1_down = 1;
- } else if (ch == (SUNKBD_L1|SUNKBD_UP)) {
- l1a_state.l1_down = 0;
- } else if (ch == SUNKBD_A && l1a_state.l1_down) {
- /* whee... */
- batten_down_hatches();
- /* Continue execution... */
- l1a_state.l1_down = 0;
- l1a_state.kbd_id = 0;
- return;
- }
- sunkbd_inchar(ch, regs);
- goto next_char;
- }
- if (info->cons_mouse) {
- sun_mouse_inbyte(ch, 0);
- goto next_char;
- }
- if (info->is_cons) {
- if (ch == 0) {
- /* whee, break received */
- batten_down_hatches();
- /* Continue execution... */
- return;
- }
- }
- #ifndef __sparc_v9__
- /* Look for kgdb 'stop' character, consult the gdb
- * documentation for remote target debugging and
- * arch/sparc/kernel/sparc-stub.c to see how all this works.
- */
- if (info->kgdb_channel && (ch ==' 03')) {
- breakpoint();
- return;
- }
- #endif
- if (!tty)
- return;
- do_queue_task++;
- if (tty->flip.count >= TTY_FLIPBUF_SIZE)
- break;
- tty->flip.count++;
- if (r1 & PAR_ERR)
- *tty->flip.flag_buf_ptr++ = TTY_PARITY;
- else if (r1 & Rx_OVR)
- *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
- else if (r1 & CRC_ERR)
- *tty->flip.flag_buf_ptr++ = TTY_FRAME;
- else
- *tty->flip.flag_buf_ptr++ = 0;
- *tty->flip.char_buf_ptr++ = ch;
- next_char:
- {
- unsigned char stat;
- /* Check if we have another character... */
- stat = sbus_readb(&info->zs_channel->control);
- ZSDELAY();
- ZSLOG(REGCTRL, stat, 0);
- if (!(stat & Rx_CH_AV))
- break;
- }
- }
- if (do_queue_task != 0)
- queue_task(&tty->flip.tqueue, &tq_timer);
- }
- static void transmit_chars(struct sun_serial *info)
- {
- struct tty_struct *tty = info->tty;
- if (info->x_char) {
- /* Send next char */
- zs_put_char(info->zs_channel, info->x_char);
- info->x_char = 0;
- return;
- }
- if ((info->xmit_cnt <= 0) || (tty != 0 && tty->stopped)) {
- /* That's peculiar... */
- sbus_writeb(RES_Tx_P, &info->zs_channel->control);
- ZSDELAY();
- ZS_WSYNC(info->zs_channel);
- ZSLOG(REGCTRL, RES_Tx_P, 1);
- return;
- }
- /* Send char */
- zs_put_char(info->zs_channel, info->xmit_buf[info->xmit_tail++]);
- info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
- info->xmit_cnt--;
- if (info->xmit_cnt < WAKEUP_CHARS)
- zs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
- if (info->xmit_cnt <= 0) {
- sbus_writeb(RES_Tx_P, &info->zs_channel->control);
- ZSDELAY();
- ZS_WSYNC(info->zs_channel);
- ZSLOG(REGCTRL, RES_Tx_P, 1);
- }
- }
- static void status_handle(struct sun_serial *info)
- {
- unsigned char status;
- /* Get status from Read Register 0 */
- status = sbus_readb(&info->zs_channel->control);
- ZSDELAY();
- ZSLOG(REGCTRL, status, 0);
- /* Clear status condition... */
- sbus_writeb(RES_EXT_INT, &info->zs_channel->control);
- ZSDELAY();
- ZS_WSYNC(info->zs_channel);
- ZSLOG(REGCTRL, RES_EXT_INT, 1);
- #if 0
- if (status & DCD) {
- if ((info->tty->termios->c_cflag & CRTSCTS) &&
- ((info->curregs[3] & AUTO_ENAB)==0)) {
- info->curregs[3] |= AUTO_ENAB;
- write_zsreg(info->zs_channel, 3, info->curregs[3]);
- }
- } else {
- if ((info->curregs[3] & AUTO_ENAB)) {
- info->curregs[3] &= ~AUTO_ENAB;
- write_zsreg(info->zs_channel, 3, info->curregs[3]);
- }
- }
- #endif
- /* Whee, if this is console input and this is a
- * 'break asserted' status change interrupt, call
- * the boot prom.
- */
- if (status & BRK_ABRT) {
- if (info->break_abort)
- batten_down_hatches();
- if (info->cons_mouse)
- sun_mouse_inbyte(0, 1);
- }
- /* XXX Whee, put in a buffer somewhere, the status information
- * XXX whee whee whee... Where does the information go...
- */
- return;
- }
- /*
- * This is the serial driver's generic interrupt routine
- */
- void zs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
- {
- struct sun_serial *info;
- int i;
- info = (struct sun_serial *)dev_id;
- ZSLOG(REGIRQ, 0, 0);
- for (i = 0; i < NUM_SERIAL; i++) {
- unsigned char r3 = read_zsreg(info->zs_channel, 3);
- /* Channel A -- /dev/ttya or /dev/kbd, could be the console */
- if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
- sbus_writeb(RES_H_IUS, &info->zs_channel->control);
- ZSDELAY();
- ZS_WSYNC(info->zs_channel);
- ZSLOG(REGCTRL, RES_H_IUS, 1);
- if (r3 & CHARxIP)
- receive_chars(info, regs);
- if (r3 & CHAEXT)
- status_handle(info);
- if (r3 & CHATxIP)
- transmit_chars(info);
- }
- /* Channel B -- /dev/ttyb or /dev/mouse, could be the console */
- info = info->zs_next;
- if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
- sbus_writeb(RES_H_IUS, &info->zs_channel->control);
- ZSDELAY();
- ZS_WSYNC(info->zs_channel);
- ZSLOG(REGCTRL, RES_H_IUS, 1);
- if (r3 & CHBRxIP)
- receive_chars(info, regs);
- if (r3 & CHBEXT)
- status_handle(info);
- if (r3 & CHBTxIP)
- transmit_chars(info);
- }
- info = info->zs_next;
- }
- }
- /*
- * -------------------------------------------------------------------
- * 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
- * zs_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 zs_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 sun_serial *info = (struct sun_serial *) private_;
- struct tty_struct *tty;
-
- tty = info->tty;
- if (!tty)
- return;
- if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
- if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
- tty->ldisc.write_wakeup)
- (tty->ldisc.write_wakeup)(tty);
- wake_up_interruptible(&tty->write_wait);
- }
- }
- /*
- * This routine is called from the scheduler tqueue when the interrupt
- * routine has signalled that a hangup has occurred. The path of
- * hangup processing is:
- *
- * serial interrupt routine -> (scheduler tqueue) ->
- * do_serial_hangup() -> tty->hangup() -> zs_hangup()
- *
- */
- static void do_serial_hangup(void *private_)
- {
- struct sun_serial *info = (struct sun_serial *) private_;
- struct tty_struct *tty;
-
- tty = info->tty;
- if (!tty)
- return;
- #ifdef SERIAL_DEBUG_OPEN
- printk("do_serial_hangup<%p: tty-%dn",
- __builtin_return_address(0), info->line);
- #endif
- tty_hangup(tty);
- }
- static int startup(struct sun_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 tty-%d (irq %d)...n", info->line, info->irq);
- #endif
- /*
- * Clear the FIFO buffers and disable them
- * (they will be reenabled in change_speed())
- */
- ZS_CLEARFIFO(info->zs_channel);
- info->xmit_fifo_size = 1;
- /*
- * Clear the interrupt registers.
- */
- sbus_writeb(ERR_RES, &info->zs_channel->control);
- ZSDELAY();
- ZS_WSYNC(info->zs_channel);
- ZSLOG(REGCTRL, ERR_RES, 1);
- sbus_writeb(RES_H_IUS, &info->zs_channel->control);
- ZSDELAY();
- ZS_WSYNC(info->zs_channel);
- ZSLOG(REGCTRL, RES_H_IUS, 1);
- /*
- * Now, initialize the Zilog
- */
- zs_rtsdtr(info, 1);
- /*
- * Finally, enable sequencing and interrupts
- */
- info->curregs[1] |= (info->curregs[1] & ~(RxINT_MASK)) |
- (EXT_INT_ENAB | INT_ALL_Rx);
- info->curregs[3] |= (RxENAB | Rx8);
- /* We enable Tx interrupts as needed. */
- info->curregs[5] |= (TxENAB | Tx8);
- info->curregs[9] |= (NV | MIE);
- write_zsreg(info->zs_channel, 3, info->curregs[3]);
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- write_zsreg(info->zs_channel, 9, info->curregs[9]);
-
- /*
- * And clear the interrupt registers again for luck.
- */
- sbus_writeb(ERR_RES, &info->zs_channel->control);
- ZSDELAY();
- ZS_WSYNC(info->zs_channel);
- ZSLOG(REGCTRL, ERR_RES, 1);
- sbus_writeb(RES_H_IUS, &info->zs_channel->control);
- ZSDELAY();
- ZS_WSYNC(info->zs_channel);
- ZSLOG(REGCTRL, RES_H_IUS, 1);
- if (info->tty)
- clear_bit(TTY_IO_ERROR, &info->tty->flags);
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
- /*
- * and set the speed of the serial port
- */
- change_speed(info);
- info->flags |= ZILOG_INITIALIZED;
- restore_flags(flags);
- return 0;
- }
- /*
- * This routine will shutdown a serial port; interrupts are disabled, and
- * DTR is dropped if the hangup on close termio flag is on.
- */
- static void shutdown(struct sun_serial * info)
- {
- unsigned long flags;
- if (!(info->flags & ZILOG_INITIALIZED))
- return;
- #ifdef SERIAL_DEBUG_OPEN
- printk("Shutting down serial port %d (irq %d)....", info->line,
- info->irq);
- #endif
-
- save_flags(flags); cli(); /* Disable interrupts */
-
- if (info->xmit_buf) {
- free_page((unsigned long) info->xmit_buf);
- info->xmit_buf = 0;
- }
- if (info->tty)
- set_bit(TTY_IO_ERROR, &info->tty->flags);
-
- info->flags &= ~ZILOG_INITIALIZED;
- restore_flags(flags);
- }
- /*
- * This routine is called to set the UART divisor registers to match
- * the specified baud rate for a serial port.
- */
- static void change_speed(struct sun_serial *info)
- {
- unsigned cflag;
- int baud, quot = 0;
- int brg;
- if (!info->tty || !info->tty->termios)
- return;
- cflag = info->tty->termios->c_cflag;
- if (!info->port)
- return;
- baud = tty_get_baud_rate(info->tty);
-
- if ((baud == 38400) &&
- ((info->flags & ZILOG_SPD_MASK) == ZILOG_SPD_CUST))
- quot = info->custom_divisor;
- if (quot) {
- info->zs_baud = info->baud_base / quot;
- info->clk_divisor = 16;
- info->curregs[4] = X16CLK;
- info->curregs[11] = TCBR | RCBR;
- brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor);
- info->curregs[12] = (brg & 255);
- info->curregs[13] = ((brg >> 8) & 255);
- info->curregs[14] = BRSRC | BRENAB;
- zs_rtsdtr(info, 1);
- } else if (baud) {
- info->zs_baud = baud;
- info->clk_divisor = 16;
- info->curregs[4] = X16CLK;
- info->curregs[11] = TCBR | RCBR;
- brg = BPS_TO_BRG(info->zs_baud, ZS_CLOCK/info->clk_divisor);
- info->curregs[12] = (brg & 255);
- info->curregs[13] = ((brg >> 8) & 255);
- info->curregs[14] = BRSRC | BRENAB;
- zs_rtsdtr(info, 1);
- } else {
- zs_rtsdtr(info, 0);
- return;
- }
- /* byte size and parity */
- switch (cflag & CSIZE) {
- case CS5:
- info->curregs[3] &= ~(RxN_MASK);
- info->curregs[3] |= Rx5;
- info->curregs[5] &= ~(TxN_MASK);
- info->curregs[5] |= Tx5;
- info->parity_mask = 0x1f;
- break;
- case CS6:
- info->curregs[3] &= ~(RxN_MASK);
- info->curregs[3] |= Rx6;
- info->curregs[5] &= ~(TxN_MASK);
- info->curregs[5] |= Tx6;
- info->parity_mask = 0x3f;
- break;
- case CS7:
- info->curregs[3] &= ~(RxN_MASK);
- info->curregs[3] |= Rx7;
- info->curregs[5] &= ~(TxN_MASK);
- info->curregs[5] |= Tx7;
- info->parity_mask = 0x7f;
- break;
- case CS8:
- default: /* defaults to 8 bits */
- info->curregs[3] &= ~(RxN_MASK);
- info->curregs[3] |= Rx8;
- info->curregs[5] &= ~(TxN_MASK);
- info->curregs[5] |= Tx8;
- info->parity_mask = 0xff;
- break;
- }
- info->curregs[4] &= ~(0x0c);
- if (cflag & CSTOPB) {
- info->curregs[4] |= SB2;
- } else {
- info->curregs[4] |= SB1;
- }
- if (cflag & PARENB) {
- info->curregs[4] |= PAR_ENAB;
- } else {
- info->curregs[4] &= ~PAR_ENAB;
- }
- if (!(cflag & PARODD)) {
- info->curregs[4] |= PAR_EVEN;
- } else {
- info->curregs[4] &= ~PAR_EVEN;
- }
- /* Load up the new values */
- load_zsregs(info, info->curregs);
- return;
- }
- /* This is for mouse/keyboard output.
- * XXX mouse output??? can we send it commands??? XXX
- */
- static void kbd_put_char(unsigned char ch)
- {
- struct sun_zschannel *chan = zs_kbdchan;
- unsigned long flags;
- if(!chan)
- return;
- save_flags(flags); cli();
- zs_put_char(chan, ch);
- restore_flags(flags);
- }
- void mouse_put_char(char ch)
- {
- struct sun_zschannel *chan = zs_mousechan;
- unsigned long flags;
- if(!chan)
- return;
- save_flags(flags); cli();
- zs_put_char(chan, ch);
- restore_flags(flags);
- }
- /* These are for receiving and sending characters under the kgdb
- * source level kernel debugger.
- */
- void putDebugChar(char kgdb_char)
- {
- struct sun_zschannel *chan = zs_kgdbchan;
- while((sbus_readb(&chan->control) & Tx_BUF_EMP)==0)
- udelay(5);
- sbus_writeb(kgdb_char, &chan->data);
- ZS_WSYNC(chan);
- ZSLOG(REGDATA, kgdb_char, 1);
- }
- char getDebugChar(void)
- {
- struct sun_zschannel *chan = zs_kgdbchan;
- u8 val;
- do {
- val = sbus_readb(&chan->control);
- ZSLOG(REGCTRL, val, 0);
- udelay(5);
- } while ((val & Rx_CH_AV) == 0);
- val = sbus_readb(&chan->data);
- ZSLOG(REGDATA, val, 0);
- return val;
- }
- static void zs_flush_chars(struct tty_struct *tty)
- {
- struct sun_serial *info = (struct sun_serial *) tty->driver_data;
- unsigned long flags;
- if (serial_paranoia_check(info, tty->device, "zs_flush_chars"))
- return;
- save_flags(flags); cli();
- if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
- !info->xmit_buf)
- goto out;
- /* Enable transmitter */
- info->curregs[1] |= TxINT_ENAB|EXT_INT_ENAB;
- write_zsreg(info->zs_channel, 1, info->curregs[1]);
- info->curregs[5] |= TxENAB;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- /*
- * Send a first (bootstrapping) character. A best solution is
- * to call transmit_chars() here which handles output in a
- * generic way. Current transmit_chars() not only transmits,
- * but resets interrupts also what we do not desire here.
- * XXX Discuss with David.
- */
- zs_put_char(info->zs_channel, info->xmit_buf[info->xmit_tail++]);
- info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
- info->xmit_cnt--;
- out:
- restore_flags(flags);
- }
- static int zs_write(struct tty_struct * tty, int from_user,
- const unsigned char *buf, int count)
- {
- struct sun_serial *info = (struct sun_serial *) tty->driver_data;
- unsigned long flags;
- int c, total = 0;
- if (serial_paranoia_check(info, tty->device, "zs_write"))
- return 0;
- if (!info || !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 (!total)
- total = -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;
- total += 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;
- total += c;
- }
- }
- cli();
- if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
- /* Enable transmitter */
- info->curregs[1] |= TxINT_ENAB|EXT_INT_ENAB;
- write_zsreg(info->zs_channel, 1, info->curregs[1]);
- info->curregs[5] |= TxENAB;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- #if 1
- zs_put_char(info->zs_channel,
- info->xmit_buf[info->xmit_tail++]);
- info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
- info->xmit_cnt--;
- #endif
- }
- restore_flags(flags);
- return total;
- }
- static int zs_write_room(struct tty_struct *tty)
- {
- struct sun_serial *info = (struct sun_serial *) tty->driver_data;
- int ret;
- if (serial_paranoia_check(info, tty->device, "zs_write_room"))
- return 0;
- ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
- if (ret < 0)
- ret = 0;
- return ret;
- }
- static int zs_chars_in_buffer(struct tty_struct *tty)
- {
- struct sun_serial *info = (struct sun_serial *) tty->driver_data;
- if (serial_paranoia_check(info, tty->device, "zs_chars_in_buffer"))
- return 0;
- return info->xmit_cnt;
- }
- static void zs_flush_buffer(struct tty_struct *tty)
- {
- struct sun_serial *info = (struct sun_serial *) tty->driver_data;
- if (serial_paranoia_check(info, tty->device, "zs_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);
- }
- /*
- * ------------------------------------------------------------
- * zs_throttle()
- *
- * This routine is called by the upper-layer tty layer to signal that
- * incoming characters should be throttled.
- * ------------------------------------------------------------
- */
- static void zs_throttle(struct tty_struct * tty)
- {
- struct sun_serial *info = (struct sun_serial *) tty->driver_data;
- #ifdef SERIAL_DEBUG_THROTTLE
- char buf[64];
-
- printk("throttle %s: %d....n", _tty_name(tty, buf),
- tty->ldisc.chars_in_buffer(tty));
- #endif
- if (serial_paranoia_check(info, tty->device, "zs_throttle"))
- return;
-
- if (I_IXOFF(tty))
- info->x_char = STOP_CHAR(tty);
- /* Turn off RTS line */
- cli();
- info->curregs[5] &= ~RTS;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- sti();
- }
- static void zs_unthrottle(struct tty_struct * tty)
- {
- struct sun_serial *info = (struct sun_serial *) tty->driver_data;
- #ifdef SERIAL_DEBUG_THROTTLE
- char buf[64];
-
- printk("unthrottle %s: %d....n", _tty_name(tty, buf),
- tty->ldisc.chars_in_buffer(tty));
- #endif
- if (serial_paranoia_check(info, tty->device, "zs_unthrottle"))
- return;
-
- if (I_IXOFF(tty)) {
- if (info->x_char)
- info->x_char = 0;
- else
- info->x_char = START_CHAR(tty);
- }
- /* Assert RTS line */
- cli();
- info->curregs[5] |= RTS;
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- sti();
- }
- /*
- * ------------------------------------------------------------
- * zs_ioctl() and friends
- * ------------------------------------------------------------
- */
- static int get_serial_info(struct sun_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;
- if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
- return -EFAULT;
- return 0;
- }
- static int set_serial_info(struct sun_serial * info,
- struct serial_struct * new_info)
- {
- struct serial_struct new_serial;
- struct sun_serial old_info;
- int retval = 0;
- if (!new_info || copy_from_user(&new_serial,new_info,sizeof(new_serial)))
- return -EFAULT;
- 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(new_serial.baud_base < 9600)
- return -EINVAL;
- 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->custom_divisor = new_serial.custom_divisor;
- info->type = new_serial.type;
- info->close_delay = new_serial.close_delay;
- info->closing_wait = new_serial.closing_wait;
- check_and_exit:
- retval = startup(info);
- return retval;
- }
- /*
- * get_lsr_info - get line status register info
- *
- * Purpose: Let user call ioctl() to get info when the UART physically
- * is emptied. On bus types like RS485, the transmitter must
- * release the bus after transmitting. This must be done when
- * the transmit shift register is empty, not be done when the
- * transmit holding register is empty. This functionality
- * allows an RS485 driver to be written in user space.
- */
- static int get_lsr_info(struct sun_serial * info, unsigned int *value)
- {
- unsigned char status;
- cli();
- status = sbus_readb(&info->zs_channel->control);
- ZSDELAY();
- ZSLOG(REGCTRL, status, 0);
- sti();
- if (put_user(status, value))
- return -EFAULT;
- return 0;
- }
- static int get_modem_info(struct sun_serial * info, unsigned int *value)
- {
- unsigned char status;
- unsigned int result;
- cli();
- status = sbus_readb(&info->zs_channel->control);
- ZSDELAY();
- ZSLOG(REGCTRL, status, 0);
- sti();
- result = ((info->curregs[5] & RTS) ? TIOCM_RTS : 0)
- | ((info->curregs[5] & DTR) ? TIOCM_DTR : 0)
- | ((status & DCD) ? TIOCM_CAR : 0)
- | ((status & SYNC) ? TIOCM_DSR : 0)
- | ((status & CTS) ? TIOCM_CTS : 0);
- if (put_user(result, value))
- return -EFAULT;
- return 0;
- }
- static int set_modem_info(struct sun_serial * info, unsigned int cmd,
- unsigned int *value)
- {
- unsigned int arg;
- if (get_user(arg, value))
- return -EFAULT;
- switch (cmd) {
- case TIOCMBIS:
- if (arg & TIOCM_RTS)
- info->curregs[5] |= RTS;
- if (arg & TIOCM_DTR)
- info->curregs[5] |= DTR;
- break;
- case TIOCMBIC:
- if (arg & TIOCM_RTS)
- info->curregs[5] &= ~RTS;
- if (arg & TIOCM_DTR)
- info->curregs[5] &= ~DTR;
- break;
- case TIOCMSET:
- info->curregs[5] = ((info->curregs[5] & ~(RTS | DTR))
- | ((arg & TIOCM_RTS) ? RTS : 0)
- | ((arg & TIOCM_DTR) ? DTR : 0));
- break;
- default:
- return -EINVAL;
- }
- cli();
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- sti();
- return 0;
- }
- /*
- * This routine sends a break character out the serial port.
- */
- static void send_break( struct sun_serial * info, int duration)
- {
- if (!info->port)
- return;
- current->state = TASK_INTERRUPTIBLE;
- cli();
- write_zsreg(info->zs_channel, 5, (info->curregs[5] | SND_BRK));
- schedule_timeout(duration);
- write_zsreg(info->zs_channel, 5, info->curregs[5]);
- sti();
- }
- static int zs_ioctl(struct tty_struct *tty, struct file * file,
- unsigned int cmd, unsigned long arg)
- {
- struct sun_serial * info = (struct sun_serial *) tty->driver_data;
- int retval;
- if (serial_paranoia_check(info, tty->device, "zs_ioctl"))
- return -ENODEV;
- if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
- (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
- (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
- if (tty->flags & (1 << TTY_IO_ERROR))
- return -EIO;
- }
-
- switch (cmd) {
- case TCSBRK: /* SVID version: non-zero arg --> no break */
- retval = tty_check_change(tty);
- if (retval)
- return retval;
- tty_wait_until_sent(tty, 0);
- if (!arg)
- send_break(info, HZ/4); /* 1/4 second */
- return 0;
- case TCSBRKP: /* support for POSIX tcsendbreak() */
- retval = tty_check_change(tty);
- if (retval)
- return retval;
- tty_wait_until_sent(tty, 0);
- send_break(info, arg ? arg*(HZ/10) : HZ/4);
- return 0;
- case TIOCGSOFTCAR:
- if (put_user(C_CLOCAL(tty) ? 1 : 0,
- (unsigned long *) arg))
- return -EFAULT;
- return 0;
- case TIOCSSOFTCAR:
- if (get_user(arg, (unsigned long *) arg))
- return -EFAULT;
- tty->termios->c_cflag =
- ((tty->termios->c_cflag & ~CLOCAL) |
- (arg ? CLOCAL : 0));
- return 0;
- case TIOCMGET:
- return get_modem_info(info, (unsigned int *) arg);
- case TIOCMBIS:
- case TIOCMBIC:
- case TIOCMSET:
- return set_modem_info(info, cmd, (unsigned int *) arg);
- case TIOCGSERIAL:
- return get_serial_info(info,
- (struct serial_struct *) arg);
- case TIOCSSERIAL:
- return set_serial_info(info,
- (struct serial_struct *) arg);
- case TIOCSERGETLSR: /* Get line status register */
- return get_lsr_info(info, (unsigned int *) arg);
- case TIOCSERGSTRUCT:
- if (copy_to_user((struct sun_serial *) arg,
- info, sizeof(struct sun_serial)))
- return -EFAULT;
- return 0;
-
- default:
- return -ENOIOCTLCMD;
- }
- return 0;
- }
- static void zs_set_termios(struct tty_struct *tty, struct termios *old_termios)
- {
- struct sun_serial *info = (struct sun_serial *) tty->driver_data;
- if (tty->termios->c_cflag == old_termios->c_cflag)
- return;
- change_speed(info);
- if ((old_termios->c_cflag & CRTSCTS) &&
- !(tty->termios->c_cflag & CRTSCTS)) {
- tty->hw_stopped = 0;
- zs_start(tty);
- }
- }
- /*
- * ------------------------------------------------------------
- * zs_close()
- *
- * This routine is called when the serial port gets closed. First, we
- * wait for the last remaining data to be sent. Then, we unlink its
- * ZILOG structure from the interrupt chain if necessary, and we free
- * that IRQ if nothing is left in the chain.
- * ------------------------------------------------------------
- */
- static void zs_close(struct tty_struct *tty, struct file * filp)
- {
- struct sun_serial * info = (struct sun_serial *) tty->driver_data;
- unsigned long flags;
- if (!info || serial_paranoia_check(info, tty->device, "zs_close"))
- return;
-
- save_flags(flags); cli();
-
- if (tty_hung_up_p(filp)) {
- restore_flags(flags);
- return;
- }
-
- #ifdef SERIAL_DEBUG_OPEN
- printk("zs_close tty-%d, 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("zs_close: bad serial port count; tty->count is 1, "
- "info->count is %dn", info->count);
- info->count = 1;
- }
- if (--info->count < 0) {
- printk("zs_close: bad serial port count for ttys%d: %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 receive line status interrupts, and tell the
- * interrupt driver to stop checking the data ready bit in the
- * line status register.
- */
- /** if (!info->iscons) ... **/
- info->curregs[3] &= ~RxENAB;
- write_zsreg(info->zs_channel, 3, info->curregs[3]);
- info->curregs[1] &= ~(RxINT_MASK);
- write_zsreg(info->zs_channel, 1, info->curregs[1]);
- ZS_CLEARFIFO(info->zs_channel);
- shutdown(info);
- if (tty->driver.flush_buffer)
- tty->driver.flush_buffer(tty);
- if (tty->ldisc.flush_buffer)
- tty->ldisc.flush_buffer(tty);
- tty->closing = 0;
- info->event = 0;
- info->tty = 0;
- if (tty->ldisc.num != ldiscs[N_TTY].num) {
- if (tty->ldisc.close)
- (tty->ldisc.close)(tty);
- tty->ldisc = ldiscs[N_TTY];
- tty->termios->c_line = N_TTY;
- if (tty->ldisc.open)
- (tty->ldisc.open)(tty);
- }
- if (info->blocked_open) {
- if (info->close_delay) {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(info->close_delay);
- }
- wake_up_interruptible(&info->open_wait);
- }
- info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE|
- ZILOG_CLOSING);
- wake_up_interruptible(&info->close_wait);
- #ifdef SERIAL_DEBUG_OPEN
- printk("zs_close tty-%d exiting, count = %dn", info->line, info->count);
- #endif
- restore_flags(flags);
- }
- /*
- * zs_hangup() --- called by tty_hangup() when a hangup is signaled.
- */
- void zs_hangup(struct tty_struct *tty)
- {
- struct sun_serial * info = (struct sun_serial *) tty->driver_data;
- if (serial_paranoia_check(info, tty->device, "zs_hangup"))
- return;
- if (info->is_cons)
- return;
- #ifdef SERIAL_DEBUG_OPEN
- printk("zs_hangup<%p: tty-%d, count = %d byen",
- __builtin_return_address(0), info->line, info->count);
- #endif
- zs_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);
- }
- /*
- *
- * line_info - returns information about each channel
- *
- */
- static inline int line_info(char *buf, struct sun_serial *info)
- {
- unsigned char status;
- char stat_buf[30];
- int ret;
- ret = sprintf(buf, "%d: uart:Zilog8530 port:%x irq:%d",
- info->line, info->port, info->irq);
- cli();
- status = sbus_readb(&info->zs_channel->control);
- ZSDELAY();
- ZSLOG(REGCTRL, status, 0);
- sti();
- stat_buf[0] = 0;
- stat_buf[1] = 0;
- if (info->curregs[5] & RTS)
- strcat(stat_buf, "|RTS");
- if (status & CTS)
- strcat(stat_buf, "|CTS");
- if (info->curregs[5] & DTR)
- strcat(stat_buf, "|DTR");
- if (status & SYNC)
- strcat(stat_buf, "|DSR");
- if (status & DCD)
- strcat(stat_buf, "|CD");
- ret += sprintf(buf + ret, " baud:%d %sn", info->zs_baud, stat_buf + 1);
- return ret;
- }
- /*
- *
- * zs_read_proc() - called when /proc/tty/driver/serial is read.
- *
- */
- int zs_read_proc(char *page, char **start, off_t off, int count,
- int *eof, void *data)
- {
- char *revision = "$Revision: 1.68.2.2 $";
- char *version, *p;
- int i, len = 0, l;
- off_t begin = 0;
- version = strchr(revision, ' ');
- p = strchr(++version, ' ');
- *p = ' ';
- len += sprintf(page, "serinfo:1.0 driver:%sn", version);
- *p = ' ';
- for (i = 0; i < NUM_CHANNELS && len < 4000; i++) {
- l = line_info(page + len, &zs_soft[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);
- }
- /*
- * ------------------------------------------------------------
- * zs_open() and friends
- * ------------------------------------------------------------
- */
- static int block_til_ready(struct tty_struct *tty, struct file * filp,
- struct sun_serial *info)
- {
- DECLARE_WAITQUEUE(wait, current);
- int retval, do_clocal = 0;
- unsigned char r0;
- /*
- * If the device is in the middle of being closed, then block
- * until it's done, and then try again.
- */
- if (info->flags & ZILOG_CLOSING) {
- interruptible_sleep_on(&info->close_wait);
- #ifdef SERIAL_DO_RESTART
- if (info->flags & ZILOG_HUP_NOTIFY)
- return -EAGAIN;
- else
- return -ERESTARTSYS;
- #else
- return -EAGAIN;
- #endif
- }
- /*
- * If this is a callout device, then just make sure the normal
- * device isn't being used.
- */
- if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
- if (info->flags & ZILOG_NORMAL_ACTIVE)
- return -EBUSY;
- if ((info->flags & ZILOG_CALLOUT_ACTIVE) &&
- (info->flags & ZILOG_SESSION_LOCKOUT) &&
- (info->session != current->session))
- return -EBUSY;
- if ((info->flags & ZILOG_CALLOUT_ACTIVE) &&
- (info->flags & ZILOG_PGRP_LOCKOUT) &&
- (info->pgrp != current->pgrp))
- return -EBUSY;
- info->flags |= ZILOG_CALLOUT_ACTIVE;
- return 0;
- }
-
- /*
- * If non-blocking mode is set, or the port is not enabled,
- * then make the check up front and then exit.
- */
- if ((filp->f_flags & O_NONBLOCK) ||
- (tty->flags & (1 << TTY_IO_ERROR))) {
- if (info->flags & ZILOG_CALLOUT_ACTIVE)
- return -EBUSY;
- info->flags |= ZILOG_NORMAL_ACTIVE;
- return 0;
- }
- if (info->flags & ZILOG_CALLOUT_ACTIVE) {
- if (info->normal_termios.c_cflag & CLOCAL)
- do_clocal = 1;
- } else {
- if (tty->termios->c_cflag & CLOCAL)
- do_clocal = 1;
- }
-
- /*
- * Block waiting for the carrier detect and the line to become
- * free (i.e., not in use by the callout). While we are in
- * this loop, info->count is dropped by one, so that
- * zs_close() knows when to free things. We restore it upon
- * exit, either normal or abnormal.
- */
- retval = 0;
- add_wait_queue(&info->open_wait, &wait);
- #ifdef SERIAL_DEBUG_OPEN
- printk("block_til_ready before block: ttys%d, count = %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))
- zs_rtsdtr(info, 1);
- sti();
- set_current_state(TASK_INTERRUPTIBLE);
- if (tty_hung_up_p(filp) ||
- !(info->flags & ZILOG_INITIALIZED)) {
- #ifdef SERIAL_DEBUG_OPEN
- printk("block_til_ready hup-ed: ttys%d, count = %dn",
- info->line, info->count);
- #endif
- #ifdef SERIAL_DO_RESTART
- if (info->flags & ZILOG_HUP_NOTIFY)
- retval = -EAGAIN;
- else
- retval = -ERESTARTSYS;
- #else
- retval = -EAGAIN;
- #endif
- break;
- }
- cli();
- r0 = read_zsreg(info->zs_channel, R0);
- sti();
- if (!(info->flags & ZILOG_CALLOUT_ACTIVE) &&
- !(info->flags & ZILOG_CLOSING) &&
- (do_clocal || (DCD & r0)))
- break;
- if (signal_pending(current)) {
- retval = -ERESTARTSYS;
- break;
- }
- #ifdef SERIAL_DEBUG_OPEN
- printk("block_til_ready blocking: ttys%d, 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%d, 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 zs_open(struct tty_struct *tty, struct file * filp)
- {
- struct sun_serial *info;
- int retval, line;
- line = MINOR(tty->device) - tty->driver.minor_start;
- /* The zilog lines for the mouse/keyboard must be
- * opened using their respective drivers.
- */
- if ((line < 0) || (line >= NUM_CHANNELS))
- return -ENODEV;
- if((line == KEYBOARD_LINE) || (line == MOUSE_LINE))
- return -ENODEV;
- info = zs_soft + line;
- /* Is the kgdb running over this line? */
- if (info->kgdb_channel)
- return -ENODEV;
- if (serial_paranoia_check(info, tty->device, "zs_open"))
- return -ENODEV;
- #ifdef SERIAL_DEBUG_OPEN
- printk("zs_open %s%d, count = %dn", tty->driver.name, info->line,
- info->count);
- #endif
- if (info->tty != 0 && info->tty != tty) {
- /* Never happen? */
- printk("zs_open %s%d, tty overwrite.n", tty->driver.name, info->line);
- return -EBUSY;
- }
- if (!tmp_buf) {
- unsigned long page = get_free_page(GFP_KERNEL);
- if (!page)
- return -ENOMEM;
- if (tmp_buf)
- free_page(page);
- else
- tmp_buf = (unsigned char *) page;
- }
- info->count++;
- tty->driver_data = info;
- info->tty = tty;
- /*
- * Start up serial port
- */
- retval = startup(info);
- if (retval)
- return retval;
- retval = block_til_ready(tty, filp, info);
- if (retval) {
- #ifdef SERIAL_DEBUG_OPEN
- printk("zs_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 (zs_console.cflag && zs_console.index == line) {
- tty->termios->c_cflag = zs_console.cflag;
- zs_console.cflag = 0;
- change_speed(info);
- }
- #endif
- info->session = current->session;
- info->pgrp = current->pgrp;
- #ifdef SERIAL_DEBUG_OPEN
- printk("zs_open ttys%d successful...", info->line);
- #endif
- return 0;
- }
- /* Finally, routines used to initialize the serial driver. */
- static void show_serial_version(void)
- {
- char *revision = "$Revision: 1.68.2.2 $";
- char *version, *p;
- version = strchr(revision, ' ');
- p = strchr(++version, ' ');
- *p = ' ';
- printk("Sparc Zilog8530 serial driver version %sn", version);
- *p = ' ';
- }
- /* Probe the PROM for the request zs chip number.
- *
- * Note: The Sun Voyager shows two addresses and two intr for it's
- * Zilogs, what the second does, I don't know. It does work
- * with using only the first number of each property. Also
- * we have a special version for sun4u.
- */
- #ifdef __sparc_v9__
- static struct sun_zslayout * __init get_zs(int chip)
- {
- unsigned int vaddr[2] = { 0, 0 };
- unsigned long mapped_addr = 0;
- int busnode, seen, zsnode, sun4u_ino;
- static int irq = 0;
- if(chip < 0 || chip >= NUM_SERIAL) {
- prom_printf("get_zs bogon zs chip number");
- prom_halt();
- }
- if(central_bus)
- busnode = central_bus->child->prom_node;
- else
- busnode = prom_searchsiblings(prom_getchild(prom_root_node), "sbus");
- if(busnode == 0 || busnode == -1) {
- prom_printf("get_zs: no zs bus to search");
- prom_halt();
- }
- zsnode = prom_getchild(busnode);
- seen = 0;
- while(zsnode) {
- int slave;
- zsnode = prom_searchsiblings(zsnode, "zs");
- slave = prom_getintdefault(zsnode, "slave", -1);
- if((slave == chip) || (seen == chip)) {
- int len = prom_getproperty(zsnode, "address",
- (void *) vaddr, sizeof(vaddr));
- if(len == -1 || central_bus != NULL) {
- struct sbus_bus *sbus = NULL;
- struct sbus_dev *sdev = NULL;
- /* "address" property is not guarenteed,
- * everything in I/O is implicitly mapped
- * anyways by our clever TLB miss handling
- * scheme, so don't fail here. -DaveM
- */
- if (central_bus == NULL) {
- for_each_sbus(sbus) {
- for_each_sbusdev(sdev, sbus) {
- if (sdev->prom_node == zsnode)
- goto found;
- }
- }
- }
- found:
- if (sdev == NULL && central_bus == NULL)
- prom_halt();
- if (central_bus == NULL) {
- mapped_addr =
- sbus_ioremap(&sdev->resource[0], 0,
- PAGE_SIZE, "Zilog Registers");
- } else {
- struct linux_prom_registers zsregs[1];
- int err;
- err = prom_getproperty(zsnode, "reg",
- (char *)&zsregs[0],
- sizeof(zsregs));
- if (err == -1) {
- prom_printf("ZS: Cannot map Zilog regs.n");
- prom_halt();
- }
- apply_fhc_ranges(central_bus->child, &zsregs[0], 1);
- apply_central_ranges(central_bus, &zsregs[0], 1);
- mapped_addr =
- ((((u64)zsregs[0].which_io)<<32UL)|
- ((u64)zsregs[0].phys_addr));
- }
- } else if(len % sizeof(unsigned int)) {
- prom_printf("WHOOPS: proplen for %s "
- "was %d, need multiple of "
- "%dn", "address", len,
- sizeof(unsigned int));
- panic("zilog: address property");
- }
- zs_nodes[chip] = zsnode;
- len = prom_getproperty(zsnode, "interrupts",
- (char *) &sun4u_ino,
- (sizeof(sun4u_ino)));
- if(!irq) {
- if (central_bus) {
- unsigned long iclr, imap;
- iclr = central_bus->child->fhc_regs.uregs + FHC_UREGS_ICLR;
- imap = central_bus->child->fhc_regs.uregs + FHC_UREGS_IMAP;
- irq = zilog_irq = build_irq(12, 0, iclr, imap);
- } else {
- irq = zilog_irq =
- sbus_build_irq(sbus_root, sun4u_ino);
- }
- }
- break;
- }
- zsnode = prom_getsibling(zsnode);
- seen++;
- }
- if(!zsnode)
- panic("get_zs: whee chip not found");
- if(!vaddr[0] && !mapped_addr)
- panic("get_zs: whee no serial chip mappable");
- if (mapped_addr != 0) {
- return (struct sun_zslayout *) mapped_addr;
- } else {
- return (struct sun_zslayout *) prom_virt_to_phys((unsigned long)vaddr[0], 0);
- }
- }
- #else /* !(__sparc_v9__) */
- static struct sun_zslayout * __init get_zs(int chip)
- {
- struct linux_prom_irqs tmp_irq[2];
- unsigned int paddr = 0;
- unsigned int vaddr[2] = { 0, 0 };
- int zsnode, tmpnode, iospace, slave, len;
- int cpunode = 0, bbnode = 0;
- static int irq = 0;
- int chipid = chip;
- iospace = 0;
- if(chip < 0 || chip >= NUM_SERIAL)
- panic("get_zs bogon zs chip number");
- if(sparc_cpu_model == sun4) {
- struct resource dummy_resource;
- /* Grrr, these have to be hardcoded aieee */
- switch(chip) {
- case 0:
- paddr = 0xf1000000;
- break;
- case 1:
- paddr = 0xf0000000;
- break;
- };
- iospace = 0;
- zs_nodes[chip] = 0;
- if(!irq)
- zilog_irq = irq = 12;
- dummy_resource.start = paddr;
- dummy_resource.end = paddr + 8 - 1;
- dummy_resource.flags = IORESOURCE_IO;
- vaddr[0] = sbus_ioremap(&dummy_resource, 0,
- 8, "Zilog Serial");
- } else {
- /* Can use the prom for other machine types */
- zsnode = prom_getchild(prom_root_node);
- if (sparc_cpu_model == sun4d) {
- int no = 0;
- tmpnode = zsnode;
- zsnode = 0;
- bbnode = 0;
- while (tmpnode && (tmpnode = prom_searchsiblings(tmpnode, "cpu-unit"))) {
- bbnode = prom_getchild(tmpnode);
- if (bbnode && (bbnode = prom_searchsiblings(bbnode, "bootbus"))) {
- if (no == (chip >> 1)) {
- cpunode = tmpnode;
- zsnode = prom_getchild(bbnode);
- chipid = (chip & 1);
- break;
- }
- no++;
- }
- tmpnode = prom_getsibling(tmpnode);
- }
- if (!tmpnode)
- panic ("get_zs: couldn't find %dth bootbusn", chip >> 1);
- } else {
- tmpnode = prom_searchsiblings(zsnode, "obio");
- if(tmpnode)
- zsnode = prom_getchild(tmpnode);
- }
- if(!zsnode)
- panic("get_zs no zs serial prom node");
- while(zsnode) {
- zsnode = prom_searchsiblings(zsnode, "zs");
- slave = prom_getintdefault(zsnode, "slave", -1);
- if(slave == chipid) {
- /* The one we want */
- if (sparc_cpu_model != sun4d) {
- len = prom_getproperty(zsnode, "address",
- (void *) vaddr,
- sizeof(vaddr));
- if (len % sizeof(unsigned int)) {
- prom_printf("WHOOPS: proplen for %s "
- "was %d, need multiple of "
- "%dn", "address", len,
- sizeof(unsigned int));
- panic("zilog: address property");
- }
- } else {
- /* On sun4d don't have address property :( */
- struct linux_prom_registers zsreg[4];
- struct resource res;
-
- if (prom_getproperty(zsnode, "reg", (char *)zsreg, sizeof(zsreg)) == -1) {
- prom_printf ("Cannot map zs regsn");
- prom_halt();
- }
- prom_apply_generic_ranges(bbnode, cpunode, zsreg, 1);
- res.start = zsreg[0].phys_addr;
- res.end = res.start + 8 - 1;
- res.flags = zsreg[0].which_io | IORESOURCE_IO;
- vaddr[0] = sbus_ioremap(&res, 0,
- 8, "Zilog Serial");
- }
- zs_nodes[chip] = zsnode;
- len = prom_getproperty(zsnode, "intr",
- (char *) tmp_irq,
- sizeof(tmp_irq));
- if (len % sizeof(struct linux_prom_irqs)) {
- prom_printf(
- "WHOOPS: proplen for %s "
- "was %d, need multiple of "
- "%dn", "intr", len,
- sizeof(struct linux_prom_irqs));
- panic("zilog: intr property");
- }
- if(!irq) {
- irq = zilog_irq = tmp_irq[0].pri;
- } else {
- if(tmp_irq[0].pri != irq)
- panic("zilog: bogon irqs");
- }
- break;
- }
- zsnode = prom_getsibling(zsnode);
- }
- if(!zsnode)
- panic("get_zs whee chip not found");
- }
- if(!vaddr[0])
- panic("get_zs whee no serial chip mappable");
- return (struct sun_zslayout *)(unsigned long) vaddr[0];
- }
- #endif
- /* This is for the auto baud rate detection in the mouse driver. */
- void zs_change_mouse_baud(int newbaud)
- {
- int channel = MOUSE_LINE;
- int brg;
- zs_soft[channel].zs_baud = newbaud;
- brg = BPS_TO_BRG(zs_soft[channel].zs_baud,
- (ZS_CLOCK / zs_soft[channel].clk_divisor));
- write_zsreg(zs_soft[channel].zs_channel, R12, (brg & 0xff));
- write_zsreg(zs_soft[channel].zs_channel, R13, ((brg >> 8) & 0xff));
- }
- void __init zs_init_alloc_failure(const char *table_name)
- {
- prom_printf("zs_probe: Cannot alloc %s.n", table_name);
- prom_halt();
- }
- void * __init zs_alloc_bootmem(unsigned long size)
- {
- void *ret;
- ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
- if (ret != NULL)
- memset(ret, 0, size);
- return ret;
- }
- void __init zs_alloc_tables(void)
- {
- zs_chips = (struct sun_zslayout **)
- zs_alloc_bootmem(NUM_SERIAL * sizeof(struct sun_zslayout *));
- if (zs_chips == NULL)
- zs_init_alloc_failure("zs_chips");
- zs_channels = (struct sun_zschannel **)
- zs_alloc_bootmem(NUM_CHANNELS * sizeof(struct sun_zschannel *));
- if (zs_channels == NULL)
- zs_init_alloc_failure("zs_channels");
- zs_nodes = (int *)
- zs_alloc_bootmem(NUM_SERIAL * sizeof(int));
- if (zs_nodes == NULL)
- zs_init_alloc_failure("zs_nodes");
- zs_soft = (struct sun_serial *)
- zs_alloc_bootmem(NUM_CHANNELS * sizeof(struct sun_serial));
- if (zs_soft == NULL)
- zs_init_alloc_failure("zs_soft");
- zs_ttys = (struct tty_struct *)
- zs_alloc_bootmem(NUM_CHANNELS * sizeof(struct tty_struct));
- if (zs_ttys == NULL)
- zs_init_alloc_failure("zs_ttys");
- serial_table = (struct tty_struct **)
- zs_alloc_bootmem(NUM_CHANNELS * sizeof(struct tty_struct *));
- if (serial_table == NULL)
- zs_init_alloc_failure("serial_table");
- serial_termios = (struct termios **)
- zs_alloc_bootmem(NUM_CHANNELS * sizeof(struct termios *));
- if (serial_termios == NULL)
- zs_init_alloc_failure("serial_termios");
- serial_termios_locked = (struct termios **)
- zs_alloc_bootmem(NUM_CHANNELS * sizeof(struct termios *));
- if (serial_termios_locked == NULL)
- zs_init_alloc_failure("serial_termios_locked");
- }
- int __init zs_probe(void)
- {
- int node;
- if(sparc_cpu_model == sun4)
- goto no_probe;
- NUM_SERIAL = 0;
-
- node = prom_getchild(prom_root_node);
- if (sparc_cpu_model == sun4d) {
- int bbnode;
-
- while (node && (node = prom_searchsiblings(node, "cpu-unit"))) {
- bbnode = prom_getchild(node);
- if (bbnode && prom_searchsiblings(bbnode, "bootbus"))
- NUM_SERIAL += 2;
- node = prom_getsibling(node);
- }
- goto no_probe;
- }
- #ifdef __sparc_v9__
- else if (sparc_cpu_model == sun4u) {
- int central_node;
- /* Central bus zilogs must be checked for first,
- * since Enterprise boxes might have SBUSes as well.
- */
- central_node = prom_finddevice("/central");
- if(central_node != 0 && central_node != -1)
- node = prom_searchsiblings(prom_getchild(central_node), "fhc");
- else
- node = prom_searchsiblings(node, "sbus");
- if(node != 0 && node != -1)
- node = prom_getchild(node);
- if(node == 0 || node == -1)
- return -ENODEV;
- }
- #endif /* __sparc_v9__ */
- else {
- node = prom_searchsiblings(node, "obio");
- if(node)
- node = prom_getchild(node);
- NUM_SERIAL = 2;
- goto no_probe;
- }
- node = prom_searchsiblings(node, "zs");
- if (!node)
- return -ENODEV;
-
- NUM_SERIAL = 2;
- no_probe:
- zs_alloc_tables();
- /* Fill in rs_ops struct... */
- #ifdef CONFIG_SERIAL_CONSOLE
- sunserial_setinitfunc(zs_console_init);
- #endif
- sunserial_setinitfunc(zs_init);
- rs_ops.rs_kgdb_hook = zs_kgdb_hook;
- rs_ops.rs_change_mouse_baud = zs_change_mouse_baud;
- sunkbd_setinitfunc(sun_kbd_init);
- kbd_ops.compute_shiftstate = sun_compute_shiftstate;
- kbd_ops.setledstate = sun_setledstate;
- kbd_ops.getledstate = sun_getledstate;
- kbd_ops.setkeycode = sun_setkeycode;
- kbd_ops.getkeycode = sun_getkeycode;
- #if defined(__sparc_v9__) && defined(CONFIG_PCI)
- sunkbd_install_keymaps(sun_key_maps, sun_keymap_count,
- sun_func_buf, sun_func_table,
- sun_funcbufsize, sun_funcbufleft,
- sun_accent_table, sun_accent_table_size);
- #endif
- return 0;
- }
- static inline void zs_prepare(void)
- {
- int channel, chip;
- unsigned long flags;
- if (!NUM_SERIAL)
- return;
-
- save_and_cli(flags);
-
- /* Set up our interrupt linked list */
- zs_chain = &zs_soft[0];
- for(channel = 0; channel < NUM_CHANNELS - 1; channel++) {
- zs_soft[channel].zs_next = &zs_soft[channel + 1];
- zs_soft[channel].line = channel;
- }
- zs_soft[channel].zs_next = 0;
- /* Initialize Softinfo */
- for(chip = 0; chip < NUM_SERIAL; chip++) {
- /* If we are doing kgdb over one of the channels on
- * chip zero, kgdb_channel will be set to 1 by the
- * zs_kgdb_hook() routine below.
- */
- if(!zs_chips[chip]) {
- zs_chips[chip] = get_zs(chip);
- /* Two channels per chip */
- zs_channels[(chip*2)] = &zs_chips[chip]->channelA;
- zs_channels[(chip*2)+1] = &zs_chips[chip]->channelB;
- zs_soft[(chip*2)].kgdb_channel = 0;
- zs_soft[(chip*2)+1].kgdb_channel = 0;
- }
- /* First, set up channel A on this chip. */
- channel = chip * 2;
- zs_soft[channel].zs_channel = zs_channels[channel];
- zs_soft[channel].change_needed = 0;
- zs_soft[channel].clk_divisor = 16;
- zs_soft[channel].cons_keyb = 0;
- zs_soft[channel].cons_mouse = 0;
- zs_soft[channel].channelA = 1;
- /* Now, channel B */
- channel++;
- zs_soft[channel].zs_channel = zs_channels[channel];
- zs_soft[channel].change_needed = 0;
- zs_soft[channel].clk_divisor = 16;
- zs_soft[channel].cons_keyb = 0;
- zs_soft[channel].cons_mouse = 0;
- zs_soft[channel].channelA = 0;
- }
-
- restore_flags(flags);
- }
- int __init zs_init(void)
- {
- int channel, brg, i;
- unsigned long flags;
- struct sun_serial *info;
- char dummy;
- /* Setup base handler, and timer table. */
- init_bh(SERIAL_BH, do_serial_bh);
- show_serial_version();
- /* Initialize the tty_driver structure */
- /* SPARC: Not all of this is exactly right for us. */
-
- memset(&serial_driver, 0, sizeof(struct tty_driver));
- serial_driver.magic = TTY_DRIVER_MAGIC;
- serial_driver.driver_name = "serial";
- #ifdef CONFIG_DEVFS_FS
- serial_driver.name = "tts/%d";
- #else
- serial_driver.name = "ttyS";
- #endif
- serial_driver.major = TTY_MAJOR;
- serial_driver.minor_start = 64;
- serial_driver.num = NUM_CHANNELS;
- serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
- serial_driver.subtype = SERIAL_TYPE_NORMAL;
- serial_driver.init_termios = tty_std_termios;
- serial_driver.init_termios.c_cflag =
- B9600 | CS8 | CREAD | HUPCL | CLOCAL;
- serial_driver.flags = TTY_DRIVER_REAL_RAW;
- serial_driver.refcount = &serial_refcount;
- serial_driver.table = serial_table;
- serial_driver.termios = serial_termios;
- serial_driver.termios_locked = serial_termios_locked;
- serial_driver.open = zs_open;
- serial_driver.close = zs_close;
- serial_driver.write = zs_write;
- serial_driver.flush_chars = zs_flush_chars;
- serial_driver.write_room = zs_write_room;
- serial_driver.chars_in_buffer = zs_chars_in_buffer;
- serial_driver.flush_buffer = zs_flush_buffer;
- serial_driver.ioctl = zs_ioctl;
- serial_driver.throttle = zs_throttle;
- serial_driver.unthrottle = zs_unthrottle;
- serial_driver.set_termios = zs_set_termios;
- serial_driver.stop = zs_stop;
- serial_driver.start = zs_start;
- serial_driver.hangup = zs_hangup;
- /* I'm too lazy, someone write versions of this for us. -DaveM */
- /* I just did. :-) -AIB 2001-12-23 */
- serial_driver.read_proc = zs_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/%d";
- 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 drivern");
- if (tty_register_driver(&callout_driver))
- panic("Couldn't register callout drivern");
- save_flags(flags); cli();
- /* Initialize Softinfo */
- zs_prepare();
- /* Grab IRQ line before poking the chips so we do
- * not lose any interrupts.
- */
- if (request_irq(zilog_irq, zs_interrupt, SA_SHIRQ,
- "Zilog8530", zs_chain)) {
- prom_printf("Unable to attach zs intrn");
- prom_halt();
- }
- /* Initialize Hardware */
- for(channel = 0; channel < NUM_CHANNELS; channel++) {
- /* Hardware reset each chip */
- if (!(channel & 1)) {
- write_zsreg(zs_soft[channel].zs_channel, R9, FHWRES);
- ZSDELAY_LONG();
- dummy = read_zsreg(zs_soft[channel].zs_channel, R0);
- }
- if(channel == KEYBOARD_LINE) {
- zs_soft[channel].cons_keyb = 1;
- zs_soft[channel].parity_mask = 0xff;
- zs_kbdchan = zs_soft[channel].zs_channel;
- write_zsreg(zs_soft[channel].zs_channel, R4,
- (PAR_EVEN | X16CLK | SB1));
- write_zsreg(zs_soft[channel].zs_channel, R3, Rx8);
- write_zsreg(zs_soft[channel].zs_channel, R5, Tx8);
- write_zsreg(zs_soft[channel].zs_channel, R9, NV);
- write_zsreg(zs_soft[channel].zs_channel, R10, NRZ);
- write_zsreg(zs_soft[channel].zs_channel, R11,
- (TCBR | RCBR));
- zs_soft[channel].zs_baud = 1200;
- brg = BPS_TO_BRG(zs_soft[channel].zs_baud,
- ZS_CLOCK/zs_soft[channel].clk_divisor);
- write_zsreg(zs_soft[channel].zs_channel, R12,
- (brg & 0xff));
- write_zsreg(zs_soft[channel].zs_channel, R13,
- ((brg >> 8) & 0xff));
- write_zsreg(zs_soft[channel].zs_channel, R14, BRSRC);
- /* Enable Rx/Tx, IRQs, and inform kbd driver */
- write_zsreg(zs_soft[channel].zs_channel, R14,
- (BRSRC | BRENAB));
- write_zsreg(zs_soft[channel].zs_channel, R3,
- (Rx8 | RxENAB));
- write_zsreg(zs_soft[channel].zs_channel, R5,
- (Tx8 | TxENAB | DTR | RTS));
- write_zsreg(zs_soft[channel].zs_channel, R15,
- (DCDIE | CTSIE | TxUIE | BRKIE));
- write_zsreg(zs_soft[channel].zs_channel, R0,
- RES_EXT_INT);
- write_zsreg(zs_soft[channel].zs_channel, R0,
- RES_EXT_INT);
- write_zsreg(zs_soft[channel].zs_channel, R1,
- (EXT_INT_ENAB | INT_ALL_Rx));
- write_zsreg(zs_soft[channel].zs_channel, R9,
- (NV | MIE));
- ZS_CLEARERR(zs_soft[channel].zs_channel);
- ZS_CLEARFIFO(zs_soft[channel].zs_channel);
- } else if(channel == MOUSE_LINE) {
- zs_soft[channel].cons_mouse = 1;
- zs_soft[channel].parity_mask = 0xff;
- zs_mousechan = zs_soft[channel].zs_channel;
- write_zsreg(zs_soft[channel].zs_channel, R4,
- (PAR_EVEN | X16CLK | SB1));
- write_zsreg(zs_soft[channel].zs_channel, R3, Rx8);
- write_zsreg(zs_soft[channel].zs_channel, R5, Tx8);
- write_zsreg(zs_soft[channel].zs_channel, R9, NV);
- write_zsreg(zs_soft[channel].zs_channel, R10, NRZ);
- write_zsreg(zs_soft[channel].zs_channel, R11,
- (TCBR | RCBR));
- zs_soft[channel].zs_baud = 4800;
- brg = BPS_TO_BRG(zs_soft[channel].zs_baud,
- ZS_CLOCK/zs_soft[channel].clk_divisor);
- write_zsreg(zs_soft[channel].zs_channel, R12,
- (brg & 0xff));
- write_zsreg(zs_soft[channel].zs_channel, R13,
- ((brg >> 8) & 0xff));
- write_zsreg(zs_soft[channel].zs_channel, R14, BRSRC);
- /* Enable Rx, IRQs, and inform mouse driver */
- write_zsreg(zs_soft[channel].zs_channel, R14,
- (BRSRC | BRENAB));
- write_zsreg(zs_soft[channel].zs_channel, R3,
- (Rx8 | RxENAB));
- write_zsreg(zs_soft[channel].zs_channel, R5, Tx8);
- write_zsreg(zs_soft[channel].zs_channel, R15,
- (DCDIE | CTSIE | TxUIE | BRKIE));
- write_zsreg(zs_soft[channel].zs_channel, R0,
- RES_EXT_INT);
- write_zsreg(zs_soft[channel].zs_channel, R0,
- RES_EXT_INT);
- write_zsreg(zs_soft[channel].zs_channel, R1,
- (EXT_INT_ENAB | INT_ALL_Rx));
- write_zsreg(zs_soft[channel].zs_channel, R9,
- (NV | MIE));
- sun_mouse_zsinit();
- } else if (zs_soft[channel].is_cons) {
- brg = BPS_TO_BRG(zs_soft[channel].zs_baud,
- ZS_CLOCK/zs_soft[channel].clk_divisor);
- zscons_regs[12] = brg & 0xff;
- zscons_regs[13] = (brg >> 8) & 0xff;
- memcpy(zs_soft[channel].curregs, zscons_regs, sizeof(zscons_regs));
- load_zsregs(&zs_soft[channel], zscons_regs);
- ZS_CLEARERR(zs_soft[channel].zs_channel);
- ZS_CLEARFIFO(zs_soft[channel].zs_channel);
- } else if (zs_soft[channel].kgdb_channel) {
- /* If this is the kgdb line, enable interrupts because
- * we now want to receive the 'control-c' character
- * from the client attached to us asynchronously.
- */
- zs_soft[channel].parity_mask = 0xff;
- kgdb_chaninit(&zs_soft[channel], 1,
- zs_soft[channel].zs_baud);
- } else {
- zs_soft[channel].parity_mask = 0xff;
- write_zsreg(zs_soft[channel].zs_channel, R4,
- (PAR_EVEN | X16CLK | SB1));
- write_zsreg(zs_soft[channel].zs_channel, R3, Rx8);
- write_zsreg(zs_soft[channel].zs_channel, R5, Tx8);
- write_zsreg(zs_soft[channel].zs_channel, R9, NV);
- write_zsreg(zs_soft[channel].zs_channel, R10, NRZ);
- write_zsreg(zs_soft[channel].zs_channel, R11,
- (RCBR | TCBR));
- zs_soft[channel].zs_baud = 9600;
- brg = BPS_TO_BRG(zs_soft[channel].zs_baud,
- ZS_CLOCK/zs_soft[channel].clk_divisor);
- write_zsreg(zs_soft[channel].zs_channel, R12,
- (brg & 0xff));
- write_zsreg(zs_soft[channel].zs_channel, R13,
- ((brg >> 8) & 0xff));
- write_zsreg(zs_soft[channel].zs_channel, R14, BRSRC);
- write_zsreg(zs_soft[channel].zs_channel, R14,
- (BRSRC | BRENAB));
- write_zsreg(zs_soft[channel].zs_channel, R3, Rx8);
- write_zsreg(zs_soft[channel].zs_channel, R5, Tx8);
- write_zsreg(zs_soft[channel].zs_channel, R15, DCDIE);
- write_zsreg(zs_soft[channel].zs_channel, R9, NV | MIE);
- write_zsreg(zs_soft[channel].zs_channel, R0,
- RES_EXT_INT);
- write_zsreg(zs_soft[channel].zs_channel, R0,
- RES_EXT_INT);
- }
- }
- for (info = zs_chain, i=0; info; info = info->zs_next, i++) {
- info->magic = SERIAL_MAGIC;
- info->port = (long) info->zs_channel;
- info->line = i;
- info->tty = 0;
- info->irq = zilog_irq;
- info->custom_divisor = 16;
- info->close_delay = 50;
- info->closing_wait = 3000;
- info->x_char = 0;
- info->event = 0;
- info->count = 0;
- info->blocked_open = 0;
- info->tqueue.routine = do_softint;
- info->tqueue.data = info;
- info->tqueue_hangup.routine = do_serial_hangup;
- info->tqueue_hangup.data = info;
- info->callout_termios = callout_driver.init_termios;
- info->normal_termios = serial_driver.init_termios;
- init_waitqueue_head(&info->open_wait);
- init_waitqueue_head(&info->close_wait);
- printk("tty%02d at 0x%04x (irq = %s)", info->line,
- info->port, __irq_itoa(info->irq));
- printk(" is a Zilog8530n");
- }
- restore_flags(flags);
- keyboard_zsinit(kbd_put_char);
- return 0;
- }
- /* 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.
- */
- static void __init zs_kgdb_hook(int tty_num)
- {
- int chip = 0;
- if(!zs_chips[chip]) {
- zs_chips[chip] = get_zs(chip);
- /* Two channels per chip */
- zs_channels[(chip*2)] = &zs_chips[chip]->channelA;
- zs_channels[(chip*2)+1] = &zs_chips[chip]->channelB;
- }
- zs_soft[tty_num].zs_channel = zs_channels[tty_num];
- zs_kgdbchan = zs_soft[tty_num].zs_channel;
- zs_soft[tty_num].change_needed = 0;
- zs_soft[tty_num].clk_divisor = 16;
- zs_soft[tty_num].zs_baud = 9600;
- zs_soft[tty_num].kgdb_channel = 1; /* This runs kgdb */
- zs_soft[tty_num ^ 1].kgdb_channel = 0; /* This does not */
- /* Turn on transmitter/receiver at 8-bits/char */
- kgdb_chaninit(&zs_soft[tty_num], 0, 9600);
- ZS_CLEARERR(zs_kgdbchan);
- ZS_CLEARFIFO(zs_kgdbchan);
- }
- #ifdef CONFIG_SERIAL_CONSOLE
- /* This is for console output over ttya/ttyb */
- static void
- zs_console_putchar(struct sun_serial *info, char ch)
- {
- int loops = ZS_PUT_CHAR_MAX_DELAY;
- unsigned long flags;
- if(!info->zs_channel)
- return;
- save_flags(flags); cli();
- zs_put_char(info->zs_channel, ch);
- while (!(read_zsreg(info->zs_channel, R1) & ALL_SNT) && --loops)
- udelay(5);
- restore_flags(flags);
- }
- #ifdef SERIAL_CONSOLE_FAIR_OUTPUT
- /*
- * Fair output driver allows a process to speak.
- */
- static void zs_fair_output(struct sun_serial *info)
- {
- unsigned long flags;
- int left; /* Output no more than that */
- char c;
- if (info == NULL)
- return;
- if (info->xmit_buf == NULL)
- return;
- save_flags(flags); cli();
- left = info->xmit_cnt;
- while (left != 0) {
- c = info->xmit_buf[info->xmit_tail];
- info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
- info->xmit_cnt--;
- restore_flags(flags);
- zs_console_putchar(info, c);
- cli();
- left = MIN(info->xmit_cnt, left-1);
- }
- /* Last character is being transmitted now (hopefully). */
- sbus_writeb(RES_Tx_P, &info->zs_channel->control);
- ZSDELAY();
- ZSLOG(REGCTRL, RES_Tx_P, 1);
- restore_flags(flags);
- return;
- }
- #endif
- /*
- * zs_console_write is registered for printk.
- */
- static void
- zs_console_write(struct console *con, const char *s, unsigned count)
- {
- struct sun_serial *info;
- int i;
- info = zs_soft + con->index;
- for (i = 0; i < count; i++, s++) {
- if(*s == 'n')
- zs_console_putchar(info, 'r');
- zs_console_putchar(info, *s);
- }
- #ifdef SERIAL_CONSOLE_FAIR_OUTPUT
- /* Comment this if you want to have a strict interrupt-driven output */
- zs_fair_output(info);
- #endif
- }
- static kdev_t zs_console_device(struct console *con)
- {
- return MKDEV(TTY_MAJOR, 64 + con->index);
- }
- static int __init zs_console_setup(struct console *con, char *options)
- {
- static struct tty_struct c_tty;
- static struct termios c_termios;
- struct sun_serial *info;
- int brg, baud;
- info = zs_soft + con->index;
- info->is_cons = 1;
- printk("Console: ttyS%d (Zilog8530)n", info->line);
-
- sunserial_console_termios(con);
- memset(&c_tty, 0, sizeof(c_tty));
- memset(&c_termios, 0, sizeof(c_termios));
- c_tty.termios = &c_termios;
- c_termios.c_cflag = con->cflag;
- baud = tty_get_baud_rate(&c_tty);
- info->zs_baud = baud;
- switch (con->cflag & CSIZE) {
- case CS5:
- zscons_regs[3] = Rx5 | RxENAB;
- zscons_regs[5] = Tx5 | TxENAB;
- info->parity_mask = 0x1f;
- break;
- case CS6:
- zscons_regs[3] = Rx6 | RxENAB;
- zscons_regs[5] = Tx6 | TxENAB;
- info->parity_mask = 0x3f;
- break;
- case CS7:
- zscons_regs[3] = Rx7 | RxENAB;
- zscons_regs[5] = Tx7 | TxENAB;
- info->parity_mask = 0x7f;
- break;
- default:
- case CS8:
- zscons_regs[3] = Rx8 | RxENAB;
- zscons_regs[5] = Tx8 | TxENAB;
- info->parity_mask = 0xff;
- break;
- }
- zscons_regs[5] |= DTR;
- if (con->cflag & PARENB)
- zscons_regs[4] |= PAR_ENAB;
- if (!(con->cflag & PARODD))
- zscons_regs[4] |= PAR_EVEN;
- if (con->cflag & CSTOPB)
- zscons_regs[4] |= SB2;
- else
- zscons_regs[4] |= SB1;
- brg = BPS_TO_BRG(baud, ZS_CLOCK / info->clk_divisor);
- zscons_regs[12] = brg & 0xff;
- zscons_regs[13] = (brg >> 8) & 0xff;
- memcpy(info->curregs, zscons_regs, sizeof(zscons_regs));
- load_zsregs(info, zscons_regs);
- ZS_CLEARERR(info->zs_channel);
- ZS_CLEARFIFO(info->zs_channel);
- return 0;
- }
- static struct console zs_console = {
- name: "ttyS",
- write: zs_console_write,
- device: zs_console_device,
- setup: zs_console_setup,
- flags: CON_PRINTBUFFER,
- index: -1,
- };
- static int __init zs_console_init(void)
- {
- extern int con_is_present(void);
- if (con_is_present())
- return 0;
- zs_console.index = serial_console - 1;
- register_console(&zs_console);
- return 0;
- }
- #endif /* CONFIG_SERIAL_CONSOLE */