File: [Development] / linux-2.4-xfs / drivers / sbus / char / zs.c (download)
Revision 1.3, Wed Apr 13 15:13:51 2005 UTC (12 years, 6 months ago) by nathans.longdrop.melbourne.sgi.com
Branch: MAIN
CVS Tags: HEAD
Changes since 1.2: +3 -3
lines
Merge up to 2.4.30
Merge of 2.4.x-xfs-melb:linux:22159a by kenmcd.
|
/* $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 and sun4d we need to flush single writes to ensure
* completion.
*/
#ifndef __sparc_v9__
#define ZSDELAY() udelay(5)
#define ZSDELAY_LONG() udelay(20)
#else
#define ZSDELAY()
#define ZSDELAY_LONG()
#endif
#define ZS_WSYNC(__channel) \
sbus_readb(&((__channel)->control))
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 %s\n",
i, reg, val, write ? "write" : "read");
}
len += sprintf(buffer + len, "ZS current log index %d\n",
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 %s\n";
static const char *badinfo =
"Warning: null sun_serial for (%d, %d) in %s\n";
if (!info) {
printk(badinfo, MAJOR(device), MINOR(device), routine);
return 1;
}
if (info->magic != SERIAL_MAGIC) {
printk(badmagic, MAJOR(device), MINOR(device), routine);
return 1;
}
#endif
return 0;
}
/* 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 =='\003')) {
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)) {
tty_wakeup(tty);
}
}
/*
* 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-%d\n",
__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();
tty_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 = %d\n", info->line, info->count);
#endif
if ((tty->count == 1) && (info->count != 1)) {
/*
* Uh, oh. tty->count is 1, which means that the tty
* structure will be freed. Info->count should always
* be one in these conditions. If it's greater than
* one, we've got real problems, since it means the
* serial port won't be shutdown.
*/
printk("zs_close: bad serial port count; tty->count is 1, "
"info->count is %d\n", info->count);
info->count = 1;
}
if (--info->count < 0) {
printk("zs_close: bad serial port count for ttys%d: %d\n",
info->line, info->count);
info->count = 0;
}
if (info->count) {
restore_flags(flags);
return;
}
info->flags |= ZILOG_CLOSING;
/*
* Save the termios structure, since this port may have
* separate termios for callout and dialin.
*/
if (info->flags & ZILOG_NORMAL_ACTIVE)
info->normal_termios = *tty->termios;
if (info->flags & ZILOG_CALLOUT_ACTIVE)
info->callout_termios = *tty->termios;
/*
* Now we wait for the transmit buffer to clear; and we notify
* the line discipline to only process XON/XOFF characters.
*/
tty->closing = 1;
if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE)
tty_wait_until_sent(tty, info->closing_wait);
/*
* At this point we stop accepting input. To do this, we
* disable the receive line status interrupts, and tell the
* interrupt driver to stop checking the data ready bit in the
* line status register.
*/
/** if (!info->iscons) ... **/
info->curregs[3] &= ~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);
tty_ldisc_flush(tty);
tty->closing = 0;
info->event = 0;
info->tty = 0;
if (tty->ldisc.num != N_TTY) {
if (tty->ldisc.close)
(tty->ldisc.close)(tty);
tty->ldisc = *(tty_ldisc_get(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 = %d\n", 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 bye\n",
__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 %s\n", 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 = '\0';
len += sprintf(page, "serinfo:1.0 driver:%s\n", 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 = %d\n",
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 = %d\n",
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 = %d\n",
info->line, info->count);
#endif
schedule();
}
current->state = TASK_RUNNING;
remove_wait_queue(&info->open_wait, &wait);
if (!tty_hung_up_p(filp))
info->count++;
info->blocked_open--;
#ifdef SERIAL_DEBUG_OPEN
printk("block_til_ready after blocking: ttys%d, count = %d\n",
info->line, info->count);
#endif
if (retval)
return retval;
info->flags |= ZILOG_NORMAL_ACTIVE;
return 0;
}
/*
* This routine is called whenever a serial port is opened. It
* enables interrupts for a serial port, linking in its ZILOG structure into
* the IRQ chain. It also performs the serial-specific
* initialization for the tty structure.
*/
int 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 = %d\n", 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 %d\n",
retval);
#endif
return retval;
}
if ((info->count == 1) && (info->flags & ZILOG_SPLIT_TERMIOS)) {
if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
*tty->termios = info->normal_termios;
else
*tty->termios = info->callout_termios;
change_speed(info);
}
#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 = '\0';
printk("Sparc Zilog8530 serial driver version %s\n", 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 "
"%d\n", "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 bootbus\n", 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 "
"%d\n", "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 regs\n");
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 "
"%d\n", "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 driver\n");
if (tty_register_driver(&callout_driver))
panic("Couldn't register callout driver\n");
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 intr\n");
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 Zilog8530\n");
}
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 */
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