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linux/drivers/serial/sunzilog.c
Russell King c5f4644e6c [PATCH] Serial: Adjust serial locking 
This patch changes the way serial ports are locked when getting modem
status.  This change is necessary because we will need to atomically
read the modem status and take action depending on the CTS status.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-06-29 09:42:38 +01:00

1775 lines
44 KiB
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/*
* sunzilog.c
*
* Driver for Zilog serial chips found on Sun workstations and
* servers. This driver could actually be made more generic.
*
* This is based on the old drivers/sbus/char/zs.c code. A lot
* of code has been simply moved over directly from there but
* much has been rewritten. Credits therefore go out to Eddie
* C. Dost, Pete Zaitcev, Ted Ts'o and Alex Buell for their
* work there.
*
* Copyright (C) 2002 David S. Miller (davem@redhat.com)
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/major.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/circ_buf.h>
#include <linux/serial.h>
#include <linux/sysrq.h>
#include <linux/console.h>
#include <linux/spinlock.h>
#ifdef CONFIG_SERIO
#include <linux/serio.h>
#endif
#include <linux/init.h>
#include <asm/io.h>
#include <asm/irq.h>
#ifdef CONFIG_SPARC64
#include <asm/fhc.h>
#endif
#include <asm/sbus.h>
#if defined(CONFIG_SERIAL_SUNZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/serial_core.h>
#include "suncore.h"
#include "sunzilog.h"
/* On 32-bit sparcs we need to delay after register accesses
* to accommodate 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 CONFIG_SPARC64
#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
static int num_sunzilog;
#define NUM_SUNZILOG num_sunzilog
#define NUM_CHANNELS (NUM_SUNZILOG * 2)
#define KEYBOARD_LINE 0x2
#define MOUSE_LINE 0x3
#define ZS_CLOCK 4915200 /* Zilog input clock rate. */
#define ZS_CLOCK_DIVISOR 16 /* Divisor this driver uses. */
/*
* We wrap our port structure around the generic uart_port.
*/
struct uart_sunzilog_port {
struct uart_port port;
/* IRQ servicing chain. */
struct uart_sunzilog_port *next;
/* Current values of Zilog write registers. */
unsigned char curregs[NUM_ZSREGS];
unsigned int flags;
#define SUNZILOG_FLAG_CONS_KEYB 0x00000001
#define SUNZILOG_FLAG_CONS_MOUSE 0x00000002
#define SUNZILOG_FLAG_IS_CONS 0x00000004
#define SUNZILOG_FLAG_IS_KGDB 0x00000008
#define SUNZILOG_FLAG_MODEM_STATUS 0x00000010
#define SUNZILOG_FLAG_IS_CHANNEL_A 0x00000020
#define SUNZILOG_FLAG_REGS_HELD 0x00000040
#define SUNZILOG_FLAG_TX_STOPPED 0x00000080
#define SUNZILOG_FLAG_TX_ACTIVE 0x00000100
unsigned int cflag;
unsigned char parity_mask;
unsigned char prev_status;
#ifdef CONFIG_SERIO
struct serio *serio;
int serio_open;
#endif
};
#define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
#define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
#define ZS_IS_KEYB(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_KEYB)
#define ZS_IS_MOUSE(UP) ((UP)->flags & SUNZILOG_FLAG_CONS_MOUSE)
#define ZS_IS_CONS(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CONS)
#define ZS_IS_KGDB(UP) ((UP)->flags & SUNZILOG_FLAG_IS_KGDB)
#define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & SUNZILOG_FLAG_MODEM_STATUS)
#define ZS_IS_CHANNEL_A(UP) ((UP)->flags & SUNZILOG_FLAG_IS_CHANNEL_A)
#define ZS_REGS_HELD(UP) ((UP)->flags & SUNZILOG_FLAG_REGS_HELD)
#define ZS_TX_STOPPED(UP) ((UP)->flags & SUNZILOG_FLAG_TX_STOPPED)
#define ZS_TX_ACTIVE(UP) ((UP)->flags & SUNZILOG_FLAG_TX_ACTIVE)
/* 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.
*
* The port lock must be held and local IRQs must be disabled
* when {read,write}_zsreg is invoked.
*/
static unsigned char read_zsreg(struct zilog_channel __iomem *channel,
unsigned char reg)
{
unsigned char retval;
sbus_writeb(reg, &channel->control);
ZSDELAY();
retval = sbus_readb(&channel->control);
ZSDELAY();
return retval;
}
static void write_zsreg(struct zilog_channel __iomem *channel,
unsigned char reg, unsigned char value)
{
sbus_writeb(reg, &channel->control);
ZSDELAY();
sbus_writeb(value, &channel->control);
ZSDELAY();
}
static void sunzilog_clear_fifo(struct zilog_channel __iomem *channel)
{
int i;
for (i = 0; i < 32; i++) {
unsigned char regval;
regval = sbus_readb(&channel->control);
ZSDELAY();
if (regval & Rx_CH_AV)
break;
regval = read_zsreg(channel, R1);
sbus_readb(&channel->data);
ZSDELAY();
if (regval & (PAR_ERR | Rx_OVR | CRC_ERR)) {
sbus_writeb(ERR_RES, &channel->control);
ZSDELAY();
ZS_WSYNC(channel);
}
}
}
/* This function must only be called when the TX is not busy. The UART
* port lock must be held and local interrupts disabled.
*/
static void __load_zsregs(struct zilog_channel __iomem *channel, unsigned char *regs)
{
int i;
/* Let pending transmits finish. */
for (i = 0; i < 1000; i++) {
unsigned char stat = read_zsreg(channel, R1);
if (stat & ALL_SNT)
break;
udelay(100);
}
sbus_writeb(ERR_RES, &channel->control);
ZSDELAY();
ZS_WSYNC(channel);
sunzilog_clear_fifo(channel);
/* Disable all interrupts. */
write_zsreg(channel, R1,
regs[R1] & ~(RxINT_MASK | TxINT_ENAB | EXT_INT_ENAB));
/* Set parity, sync config, stop bits, and clock divisor. */
write_zsreg(channel, R4, regs[R4]);
/* Set misc. TX/RX control bits. */
write_zsreg(channel, R10, regs[R10]);
/* Set TX/RX controls sans the enable bits. */
write_zsreg(channel, R3, regs[R3] & ~RxENAB);
write_zsreg(channel, R5, regs[R5] & ~TxENAB);
/* Synchronous mode config. */
write_zsreg(channel, R6, regs[R6]);
write_zsreg(channel, R7, regs[R7]);
/* Don't mess with the interrupt vector (R2, unused by us) and
* master interrupt control (R9). We make sure this is setup
* properly at probe time then never touch it again.
*/
/* Disable baud generator. */
write_zsreg(channel, R14, regs[R14] & ~BRENAB);
/* Clock mode control. */
write_zsreg(channel, R11, regs[R11]);
/* Lower and upper byte of baud rate generator divisor. */
write_zsreg(channel, R12, regs[R12]);
write_zsreg(channel, R13, regs[R13]);
/* Now rewrite R14, with BRENAB (if set). */
write_zsreg(channel, R14, regs[R14]);
/* External status interrupt control. */
write_zsreg(channel, R15, regs[R15]);
/* Reset external status interrupts. */
write_zsreg(channel, R0, RES_EXT_INT);
write_zsreg(channel, R0, RES_EXT_INT);
/* Rewrite R3/R5, this time without enables masked. */
write_zsreg(channel, R3, regs[R3]);
write_zsreg(channel, R5, regs[R5]);
/* Rewrite R1, this time without IRQ enabled masked. */
write_zsreg(channel, R1, regs[R1]);
}
/* Reprogram the Zilog channel HW registers with the copies found in the
* software state struct. If the transmitter is busy, we defer this update
* until the next TX complete interrupt. Else, we do it right now.
*
* The UART port lock must be held and local interrupts disabled.
*/
static void sunzilog_maybe_update_regs(struct uart_sunzilog_port *up,
struct zilog_channel __iomem *channel)
{
if (!ZS_REGS_HELD(up)) {
if (ZS_TX_ACTIVE(up)) {
up->flags |= SUNZILOG_FLAG_REGS_HELD;
} else {
__load_zsregs(channel, up->curregs);
}
}
}
static void sunzilog_change_mouse_baud(struct uart_sunzilog_port *up)
{
unsigned int cur_cflag = up->cflag;
int brg, new_baud;
up->cflag &= ~CBAUD;
up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
brg = BPS_TO_BRG(new_baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
up->curregs[R12] = (brg & 0xff);
up->curregs[R13] = (brg >> 8) & 0xff;
sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(&up->port));
}
static void sunzilog_kbdms_receive_chars(struct uart_sunzilog_port *up,
unsigned char ch, int is_break,
struct pt_regs *regs)
{
if (ZS_IS_KEYB(up)) {
/* Stop-A is handled by drivers/char/keyboard.c now. */
#ifdef CONFIG_SERIO
if (up->serio_open)
serio_interrupt(up->serio, ch, 0, regs);
#endif
} else if (ZS_IS_MOUSE(up)) {
int ret = suncore_mouse_baud_detection(ch, is_break);
switch (ret) {
case 2:
sunzilog_change_mouse_baud(up);
/* fallthru */
case 1:
break;
case 0:
#ifdef CONFIG_SERIO
if (up->serio_open)
serio_interrupt(up->serio, ch, 0, regs);
#endif
break;
};
}
}
static struct tty_struct *
sunzilog_receive_chars(struct uart_sunzilog_port *up,
struct zilog_channel __iomem *channel,
struct pt_regs *regs)
{
struct tty_struct *tty;
unsigned char ch, r1;
tty = NULL;
if (up->port.info != NULL && /* Unopened serial console */
up->port.info->tty != NULL) /* Keyboard || mouse */
tty = up->port.info->tty;
for (;;) {
r1 = read_zsreg(channel, R1);
if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
sbus_writeb(ERR_RES, &channel->control);
ZSDELAY();
ZS_WSYNC(channel);
}
ch = sbus_readb(&channel->control);
ZSDELAY();
/* This funny hack depends upon BRK_ABRT not interfering
* with the other bits we care about in R1.
*/
if (ch & BRK_ABRT)
r1 |= BRK_ABRT;
if (!(ch & Rx_CH_AV))
break;
ch = sbus_readb(&channel->data);
ZSDELAY();
ch &= up->parity_mask;
if (unlikely(ZS_IS_KEYB(up)) || unlikely(ZS_IS_MOUSE(up))) {
sunzilog_kbdms_receive_chars(up, ch, 0, regs);
continue;
}
if (tty == NULL) {
uart_handle_sysrq_char(&up->port, ch, regs);
continue;
}
if (unlikely(tty->flip.count >= TTY_FLIPBUF_SIZE)) {
tty->flip.work.func((void *)tty);
/*
* The 8250 bails out of the loop here,
* but we need to read everything, or die.
*/
if (tty->flip.count >= TTY_FLIPBUF_SIZE)
continue;
}
/* A real serial line, record the character and status. */
*tty->flip.char_buf_ptr = ch;
*tty->flip.flag_buf_ptr = TTY_NORMAL;
up->port.icount.rx++;
if (r1 & (BRK_ABRT | PAR_ERR | Rx_OVR | CRC_ERR)) {
if (r1 & BRK_ABRT) {
r1 &= ~(PAR_ERR | CRC_ERR);
up->port.icount.brk++;
if (uart_handle_break(&up->port))
continue;
}
else if (r1 & PAR_ERR)
up->port.icount.parity++;
else if (r1 & CRC_ERR)
up->port.icount.frame++;
if (r1 & Rx_OVR)
up->port.icount.overrun++;
r1 &= up->port.read_status_mask;
if (r1 & BRK_ABRT)
*tty->flip.flag_buf_ptr = TTY_BREAK;
else if (r1 & PAR_ERR)
*tty->flip.flag_buf_ptr = TTY_PARITY;
else if (r1 & CRC_ERR)
*tty->flip.flag_buf_ptr = TTY_FRAME;
}
if (uart_handle_sysrq_char(&up->port, ch, regs))
continue;
if (up->port.ignore_status_mask == 0xff ||
(r1 & up->port.ignore_status_mask) == 0) {
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
}
if ((r1 & Rx_OVR) &&
tty->flip.count < TTY_FLIPBUF_SIZE) {
*tty->flip.flag_buf_ptr = TTY_OVERRUN;
tty->flip.flag_buf_ptr++;
tty->flip.char_buf_ptr++;
tty->flip.count++;
}
}
return tty;
}
static void sunzilog_status_handle(struct uart_sunzilog_port *up,
struct zilog_channel __iomem *channel,
struct pt_regs *regs)
{
unsigned char status;
status = sbus_readb(&channel->control);
ZSDELAY();
sbus_writeb(RES_EXT_INT, &channel->control);
ZSDELAY();
ZS_WSYNC(channel);
if (status & BRK_ABRT) {
if (ZS_IS_MOUSE(up))
sunzilog_kbdms_receive_chars(up, 0, 1, regs);
if (ZS_IS_CONS(up)) {
/* Wait for BREAK to deassert to avoid potentially
* confusing the PROM.
*/
while (1) {
status = sbus_readb(&channel->control);
ZSDELAY();
if (!(status & BRK_ABRT))
break;
}
sun_do_break();
return;
}
}
if (ZS_WANTS_MODEM_STATUS(up)) {
if (status & SYNC)
up->port.icount.dsr++;
/* The Zilog just gives us an interrupt when DCD/CTS/etc. change.
* But it does not tell us which bit has changed, we have to keep
* track of this ourselves.
*/
if ((status ^ up->prev_status) ^ DCD)
uart_handle_dcd_change(&up->port,
(status & DCD));
if ((status ^ up->prev_status) ^ CTS)
uart_handle_cts_change(&up->port,
(status & CTS));
wake_up_interruptible(&up->port.info->delta_msr_wait);
}
up->prev_status = status;
}
static void sunzilog_transmit_chars(struct uart_sunzilog_port *up,
struct zilog_channel __iomem *channel)
{
struct circ_buf *xmit;
if (ZS_IS_CONS(up)) {
unsigned char status = sbus_readb(&channel->control);
ZSDELAY();
/* TX still busy? Just wait for the next TX done interrupt.
*
* It can occur because of how we do serial console writes. It would
* be nice to transmit console writes just like we normally would for
* a TTY line. (ie. buffered and TX interrupt driven). That is not
* easy because console writes cannot sleep. One solution might be
* to poll on enough port->xmit space becomming free. -DaveM
*/
if (!(status & Tx_BUF_EMP))
return;
}
up->flags &= ~SUNZILOG_FLAG_TX_ACTIVE;
if (ZS_REGS_HELD(up)) {
__load_zsregs(channel, up->curregs);
up->flags &= ~SUNZILOG_FLAG_REGS_HELD;
}
if (ZS_TX_STOPPED(up)) {
up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
goto ack_tx_int;
}
if (up->port.x_char) {
up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
sbus_writeb(up->port.x_char, &channel->data);
ZSDELAY();
ZS_WSYNC(channel);
up->port.icount.tx++;
up->port.x_char = 0;
return;
}
if (up->port.info == NULL)
goto ack_tx_int;
xmit = &up->port.info->xmit;
if (uart_circ_empty(xmit)) {
uart_write_wakeup(&up->port);
goto ack_tx_int;
}
if (uart_tx_stopped(&up->port))
goto ack_tx_int;
up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
sbus_writeb(xmit->buf[xmit->tail], &channel->data);
ZSDELAY();
ZS_WSYNC(channel);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
up->port.icount.tx++;
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
return;
ack_tx_int:
sbus_writeb(RES_Tx_P, &channel->control);
ZSDELAY();
ZS_WSYNC(channel);
}
static irqreturn_t sunzilog_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_sunzilog_port *up = dev_id;
while (up) {
struct zilog_channel __iomem *channel
= ZILOG_CHANNEL_FROM_PORT(&up->port);
struct tty_struct *tty;
unsigned char r3;
spin_lock(&up->port.lock);
r3 = read_zsreg(channel, R3);
/* Channel A */
tty = NULL;
if (r3 & (CHAEXT | CHATxIP | CHARxIP)) {
sbus_writeb(RES_H_IUS, &channel->control);
ZSDELAY();
ZS_WSYNC(channel);
if (r3 & CHARxIP)
tty = sunzilog_receive_chars(up, channel, regs);
if (r3 & CHAEXT)
sunzilog_status_handle(up, channel, regs);
if (r3 & CHATxIP)
sunzilog_transmit_chars(up, channel);
}
spin_unlock(&up->port.lock);
if (tty)
tty_flip_buffer_push(tty);
/* Channel B */
up = up->next;
channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
spin_lock(&up->port.lock);
tty = NULL;
if (r3 & (CHBEXT | CHBTxIP | CHBRxIP)) {
sbus_writeb(RES_H_IUS, &channel->control);
ZSDELAY();
ZS_WSYNC(channel);
if (r3 & CHBRxIP)
tty = sunzilog_receive_chars(up, channel, regs);
if (r3 & CHBEXT)
sunzilog_status_handle(up, channel, regs);
if (r3 & CHBTxIP)
sunzilog_transmit_chars(up, channel);
}
spin_unlock(&up->port.lock);
if (tty)
tty_flip_buffer_push(tty);
up = up->next;
}
return IRQ_HANDLED;
}
/* A convenient way to quickly get R0 status. The caller must _not_ hold the
* port lock, it is acquired here.
*/
static __inline__ unsigned char sunzilog_read_channel_status(struct uart_port *port)
{
struct zilog_channel __iomem *channel;
unsigned char status;
channel = ZILOG_CHANNEL_FROM_PORT(port);
status = sbus_readb(&channel->control);
ZSDELAY();
return status;
}
/* The port lock is not held. */
static unsigned int sunzilog_tx_empty(struct uart_port *port)
{
unsigned long flags;
unsigned char status;
unsigned int ret;
spin_lock_irqsave(&port->lock, flags);
status = sunzilog_read_channel_status(port);
spin_unlock_irqrestore(&port->lock, flags);
if (status & Tx_BUF_EMP)
ret = TIOCSER_TEMT;
else
ret = 0;
return ret;
}
/* The port lock is held and interrupts are disabled. */
static unsigned int sunzilog_get_mctrl(struct uart_port *port)
{
unsigned char status;
unsigned int ret;
status = sunzilog_read_channel_status(port);
ret = 0;
if (status & DCD)
ret |= TIOCM_CAR;
if (status & SYNC)
ret |= TIOCM_DSR;
if (status & CTS)
ret |= TIOCM_CTS;
return ret;
}
/* The port lock is held and interrupts are disabled. */
static void sunzilog_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
unsigned char set_bits, clear_bits;
set_bits = clear_bits = 0;
if (mctrl & TIOCM_RTS)
set_bits |= RTS;
else
clear_bits |= RTS;
if (mctrl & TIOCM_DTR)
set_bits |= DTR;
else
clear_bits |= DTR;
/* NOTE: Not subject to 'transmitter active' rule. */
up->curregs[R5] |= set_bits;
up->curregs[R5] &= ~clear_bits;
write_zsreg(channel, R5, up->curregs[R5]);
}
/* The port lock is held and interrupts are disabled. */
static void sunzilog_stop_tx(struct uart_port *port, unsigned int tty_stop)
{
struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
up->flags |= SUNZILOG_FLAG_TX_STOPPED;
}
/* The port lock is held and interrupts are disabled. */
static void sunzilog_start_tx(struct uart_port *port, unsigned int tty_start)
{
struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
unsigned char status;
up->flags |= SUNZILOG_FLAG_TX_ACTIVE;
up->flags &= ~SUNZILOG_FLAG_TX_STOPPED;
status = sbus_readb(&channel->control);
ZSDELAY();
/* TX busy? Just wait for the TX done interrupt. */
if (!(status & Tx_BUF_EMP))
return;
/* Send the first character to jump-start the TX done
* IRQ sending engine.
*/
if (port->x_char) {
sbus_writeb(port->x_char, &channel->data);
ZSDELAY();
ZS_WSYNC(channel);
port->icount.tx++;
port->x_char = 0;
} else {
struct circ_buf *xmit = &port->info->xmit;
sbus_writeb(xmit->buf[xmit->tail], &channel->data);
ZSDELAY();
ZS_WSYNC(channel);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
}
}
/* The port lock is held. */
static void sunzilog_stop_rx(struct uart_port *port)
{
struct uart_sunzilog_port *up = UART_ZILOG(port);
struct zilog_channel __iomem *channel;
if (ZS_IS_CONS(up))
return;
channel = ZILOG_CHANNEL_FROM_PORT(port);
/* Disable all RX interrupts. */
up->curregs[R1] &= ~RxINT_MASK;
sunzilog_maybe_update_regs(up, channel);
}
/* The port lock is held. */
static void sunzilog_enable_ms(struct uart_port *port)
{
struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
unsigned char new_reg;
new_reg = up->curregs[R15] | (DCDIE | SYNCIE | CTSIE);
if (new_reg != up->curregs[R15]) {
up->curregs[R15] = new_reg;
/* NOTE: Not subject to 'transmitter active' rule. */
write_zsreg(channel, R15, up->curregs[R15]);
}
}
/* The port lock is not held. */
static void sunzilog_break_ctl(struct uart_port *port, int break_state)
{
struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(port);
unsigned char set_bits, clear_bits, new_reg;
unsigned long flags;
set_bits = clear_bits = 0;
if (break_state)
set_bits |= SND_BRK;
else
clear_bits |= SND_BRK;
spin_lock_irqsave(&port->lock, flags);
new_reg = (up->curregs[R5] | set_bits) & ~clear_bits;
if (new_reg != up->curregs[R5]) {
up->curregs[R5] = new_reg;
/* NOTE: Not subject to 'transmitter active' rule. */
write_zsreg(channel, R5, up->curregs[R5]);
}
spin_unlock_irqrestore(&port->lock, flags);
}
static void __sunzilog_startup(struct uart_sunzilog_port *up)
{
struct zilog_channel __iomem *channel;
channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
up->prev_status = sbus_readb(&channel->control);
/* Enable receiver and transmitter. */
up->curregs[R3] |= RxENAB;
up->curregs[R5] |= TxENAB;
up->curregs[R1] |= EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
sunzilog_maybe_update_regs(up, channel);
}
static int sunzilog_startup(struct uart_port *port)
{
struct uart_sunzilog_port *up = UART_ZILOG(port);
unsigned long flags;
if (ZS_IS_CONS(up))
return 0;
spin_lock_irqsave(&port->lock, flags);
__sunzilog_startup(up);
spin_unlock_irqrestore(&port->lock, flags);
return 0;
}
/*
* The test for ZS_IS_CONS is explained by the following e-mail:
*****
* From: Russell King <rmk@arm.linux.org.uk>
* Date: Sun, 8 Dec 2002 10:18:38 +0000
*
* On Sun, Dec 08, 2002 at 02:43:36AM -0500, Pete Zaitcev wrote:
* > I boot my 2.5 boxes using "console=ttyS0,9600" argument,
* > and I noticed that something is not right with reference
* > counting in this case. It seems that when the console
* > is open by kernel initially, this is not accounted
* > as an open, and uart_startup is not called.
*
* That is correct. We are unable to call uart_startup when the serial
* console is initialised because it may need to allocate memory (as
* request_irq does) and the memory allocators may not have been
* initialised.
*
* 1. initialise the port into a state where it can send characters in the
* console write method.
*
* 2. don't do the actual hardware shutdown in your shutdown() method (but
* do the normal software shutdown - ie, free irqs etc)
*****
*/
static void sunzilog_shutdown(struct uart_port *port)
{
struct uart_sunzilog_port *up = UART_ZILOG(port);
struct zilog_channel __iomem *channel;
unsigned long flags;
if (ZS_IS_CONS(up))
return;
spin_lock_irqsave(&port->lock, flags);
channel = ZILOG_CHANNEL_FROM_PORT(port);
/* Disable receiver and transmitter. */
up->curregs[R3] &= ~RxENAB;
up->curregs[R5] &= ~TxENAB;
/* Disable all interrupts and BRK assertion. */
up->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
up->curregs[R5] &= ~SND_BRK;
sunzilog_maybe_update_regs(up, channel);
spin_unlock_irqrestore(&port->lock, flags);
}
/* Shared by TTY driver and serial console setup. The port lock is held
* and local interrupts are disabled.
*/
static void
sunzilog_convert_to_zs(struct uart_sunzilog_port *up, unsigned int cflag,
unsigned int iflag, int brg)
{
up->curregs[R10] = NRZ;
up->curregs[R11] = TCBR | RCBR;
/* Program BAUD and clock source. */
up->curregs[R4] &= ~XCLK_MASK;
up->curregs[R4] |= X16CLK;
up->curregs[R12] = brg & 0xff;
up->curregs[R13] = (brg >> 8) & 0xff;
up->curregs[R14] = BRSRC | BRENAB;
/* Character size, stop bits, and parity. */
up->curregs[3] &= ~RxN_MASK;
up->curregs[5] &= ~TxN_MASK;
switch (cflag & CSIZE) {
case CS5:
up->curregs[3] |= Rx5;
up->curregs[5] |= Tx5;
up->parity_mask = 0x1f;
break;
case CS6:
up->curregs[3] |= Rx6;
up->curregs[5] |= Tx6;
up->parity_mask = 0x3f;
break;
case CS7:
up->curregs[3] |= Rx7;
up->curregs[5] |= Tx7;
up->parity_mask = 0x7f;
break;
case CS8:
default:
up->curregs[3] |= Rx8;
up->curregs[5] |= Tx8;
up->parity_mask = 0xff;
break;
};
up->curregs[4] &= ~0x0c;
if (cflag & CSTOPB)
up->curregs[4] |= SB2;
else
up->curregs[4] |= SB1;
if (cflag & PARENB)
up->curregs[4] |= PAR_ENAB;
else
up->curregs[4] &= ~PAR_ENAB;
if (!(cflag & PARODD))
up->curregs[4] |= PAR_EVEN;
else
up->curregs[4] &= ~PAR_EVEN;
up->port.read_status_mask = Rx_OVR;
if (iflag & INPCK)
up->port.read_status_mask |= CRC_ERR | PAR_ERR;
if (iflag & (BRKINT | PARMRK))
up->port.read_status_mask |= BRK_ABRT;
up->port.ignore_status_mask = 0;
if (iflag & IGNPAR)
up->port.ignore_status_mask |= CRC_ERR | PAR_ERR;
if (iflag & IGNBRK) {
up->port.ignore_status_mask |= BRK_ABRT;
if (iflag & IGNPAR)
up->port.ignore_status_mask |= Rx_OVR;
}
if ((cflag & CREAD) == 0)
up->port.ignore_status_mask = 0xff;
}
/* The port lock is not held. */
static void
sunzilog_set_termios(struct uart_port *port, struct termios *termios,
struct termios *old)
{
struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
unsigned long flags;
int baud, brg;
baud = uart_get_baud_rate(port, termios, old, 1200, 76800);
spin_lock_irqsave(&up->port.lock, flags);
brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
sunzilog_convert_to_zs(up, termios->c_cflag, termios->c_iflag, brg);
if (UART_ENABLE_MS(&up->port, termios->c_cflag))
up->flags |= SUNZILOG_FLAG_MODEM_STATUS;
else
up->flags &= ~SUNZILOG_FLAG_MODEM_STATUS;
up->cflag = termios->c_cflag;
sunzilog_maybe_update_regs(up, ZILOG_CHANNEL_FROM_PORT(port));
uart_update_timeout(port, termios->c_cflag, baud);
spin_unlock_irqrestore(&up->port.lock, flags);
}
static const char *sunzilog_type(struct uart_port *port)
{
return "SunZilog";
}
/* We do not request/release mappings of the registers here, this
* happens at early serial probe time.
*/
static void sunzilog_release_port(struct uart_port *port)
{
}
static int sunzilog_request_port(struct uart_port *port)
{
return 0;
}
/* These do not need to do anything interesting either. */
static void sunzilog_config_port(struct uart_port *port, int flags)
{
}
/* We do not support letting the user mess with the divisor, IRQ, etc. */
static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *ser)
{
return -EINVAL;
}
static struct uart_ops sunzilog_pops = {
.tx_empty = sunzilog_tx_empty,
.set_mctrl = sunzilog_set_mctrl,
.get_mctrl = sunzilog_get_mctrl,
.stop_tx = sunzilog_stop_tx,
.start_tx = sunzilog_start_tx,
.stop_rx = sunzilog_stop_rx,
.enable_ms = sunzilog_enable_ms,
.break_ctl = sunzilog_break_ctl,
.startup = sunzilog_startup,
.shutdown = sunzilog_shutdown,
.set_termios = sunzilog_set_termios,
.type = sunzilog_type,
.release_port = sunzilog_release_port,
.request_port = sunzilog_request_port,
.config_port = sunzilog_config_port,
.verify_port = sunzilog_verify_port,
};
static struct uart_sunzilog_port *sunzilog_port_table;
static struct zilog_layout __iomem **sunzilog_chip_regs;
static struct uart_sunzilog_port *sunzilog_irq_chain;
static int zilog_irq = -1;
static struct uart_driver sunzilog_reg = {
.owner = THIS_MODULE,
.driver_name = "ttyS",
.devfs_name = "tts/",
.dev_name = "ttyS",
.major = TTY_MAJOR,
};
static void * __init alloc_one_table(unsigned long size)
{
void *ret;
ret = kmalloc(size, GFP_KERNEL);
if (ret != NULL)
memset(ret, 0, size);
return ret;
}
static void __init sunzilog_alloc_tables(void)
{
sunzilog_port_table =
alloc_one_table(NUM_CHANNELS * sizeof(struct uart_sunzilog_port));
sunzilog_chip_regs =
alloc_one_table(NUM_SUNZILOG * sizeof(struct zilog_layout __iomem *));
if (sunzilog_port_table == NULL || sunzilog_chip_regs == NULL) {
prom_printf("SunZilog: Cannot allocate tables.\n");
prom_halt();
}
}
#ifdef CONFIG_SPARC64
/* We used to attempt to use the address property of the Zilog device node
* but that totally is not necessary on sparc64.
*/
static struct zilog_layout __iomem * __init get_zs_sun4u(int chip, int zsnode)
{
void __iomem *mapped_addr;
unsigned int sun4u_ino;
struct sbus_bus *sbus = NULL;
struct sbus_dev *sdev = NULL;
int err;
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_printf("SunZilog: sdev&&central == NULL for "
"Zilog %d in get_zs_sun4u.\n", chip);
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];
err = prom_getproperty(zsnode, "reg",
(char *) &zsregs[0],
sizeof(zsregs));
if (err == -1) {
prom_printf("SunZilog: Cannot map "
"Zilog %d regs on "
"central bus.\n", chip);
prom_halt();
}
apply_fhc_ranges(central_bus->child,
&zsregs[0], 1);
apply_central_ranges(central_bus, &zsregs[0], 1);
mapped_addr = (void __iomem *)
((((u64)zsregs[0].which_io)<<32UL) |
((u64)zsregs[0].phys_addr));
}
if (zilog_irq == -1) {
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;
zilog_irq = build_irq(12, 0, iclr, imap);
} else {
err = prom_getproperty(zsnode, "interrupts",
(char *) &sun4u_ino,
sizeof(sun4u_ino));
zilog_irq = sbus_build_irq(sbus_root, sun4u_ino);
}
}
return (struct zilog_layout __iomem *) mapped_addr;
}
#else /* CONFIG_SPARC64 */
/*
* XXX The sun4d case is utterly screwed: it tries to re-walk the tree
* (for the 3rd time) in order to find bootbus and cpu. Streamline it.
*/
static struct zilog_layout __iomem * __init get_zs_sun4cmd(int chip, int node)
{
struct linux_prom_irqs irq_info[2];
void __iomem *mapped_addr = NULL;
int zsnode, cpunode, bbnode;
struct linux_prom_registers zsreg[4];
struct resource res;
if (sparc_cpu_model == sun4d) {
int walk;
zsnode = 0;
bbnode = 0;
cpunode = 0;
for (walk = prom_getchild(prom_root_node);
(walk = prom_searchsiblings(walk, "cpu-unit")) != 0;
walk = prom_getsibling(walk)) {
bbnode = prom_getchild(walk);
if (bbnode &&
(bbnode = prom_searchsiblings(bbnode, "bootbus"))) {
if ((zsnode = prom_getchild(bbnode)) == node) {
cpunode = walk;
break;
}
}
}
if (!walk) {
prom_printf("SunZilog: Cannot find the %d'th bootbus on sun4d.\n",
(chip / 2));
prom_halt();
}
if (prom_getproperty(zsnode, "reg",
(char *) zsreg, sizeof(zsreg)) == -1) {
prom_printf("SunZilog: Cannot map Zilog %d\n", chip);
prom_halt();
}
/* XXX Looks like an off by one? */
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;
mapped_addr = sbus_ioremap(&res, 0, 8, "Zilog Serial");
} else {
zsnode = node;
#if 0 /* XXX When was this used? */
if (prom_getintdefault(zsnode, "slave", -1) != chipid) {
zsnode = prom_getsibling(zsnode);
continue;
}
#endif
/*
* "address" is only present on ports that OBP opened
* (from Mitch Bradley's "Hitchhiker's Guide to OBP").
* We do not use it.
*/
if (prom_getproperty(zsnode, "reg",
(char *) zsreg, sizeof(zsreg)) == -1) {
prom_printf("SunZilog: Cannot map Zilog %d\n", chip);
prom_halt();
}
if (sparc_cpu_model == sun4m) /* Crude. Pass parent. XXX */
prom_apply_obio_ranges(zsreg, 1);
res.start = zsreg[0].phys_addr;
res.end = res.start + (8 - 1);
res.flags = zsreg[0].which_io | IORESOURCE_IO;
mapped_addr = sbus_ioremap(&res, 0, 8, "Zilog Serial");
}
if (prom_getproperty(zsnode, "intr",
(char *) irq_info, sizeof(irq_info))
% sizeof(struct linux_prom_irqs)) {
prom_printf("SunZilog: Cannot get IRQ property for Zilog %d.\n",
chip);
prom_halt();
}
if (zilog_irq == -1) {
zilog_irq = irq_info[0].pri;
} else if (zilog_irq != irq_info[0].pri) {
/* XXX. Dumb. Should handle per-chip IRQ, for add-ons. */
prom_printf("SunZilog: Inconsistent IRQ layout for Zilog %d.\n",
chip);
prom_halt();
}
return (struct zilog_layout __iomem *) mapped_addr;
}
#endif /* !(CONFIG_SPARC64) */
/* Get the address of the registers for SunZilog instance CHIP. */
static struct zilog_layout __iomem * __init get_zs(int chip, int node)
{
if (chip < 0 || chip >= NUM_SUNZILOG) {
prom_printf("SunZilog: Illegal chip number %d in get_zs.\n", chip);
prom_halt();
}
#ifdef CONFIG_SPARC64
return get_zs_sun4u(chip, node);
#else
if (sparc_cpu_model == sun4) {
struct resource res;
/* Not probe-able, hard code it. */
switch (chip) {
case 0:
res.start = 0xf1000000;
break;
case 1:
res.start = 0xf0000000;
break;
};
zilog_irq = 12;
res.end = (res.start + (8 - 1));
res.flags = IORESOURCE_IO;
return sbus_ioremap(&res, 0, 8, "SunZilog");
}
return get_zs_sun4cmd(chip, node);
#endif
}
#define ZS_PUT_CHAR_MAX_DELAY 2000 /* 10 ms */
static void sunzilog_put_char(struct zilog_channel __iomem *channel, unsigned char ch)
{
int loops = ZS_PUT_CHAR_MAX_DELAY;
/* This is a timed polling loop so do not switch the explicit
* udelay with ZSDELAY as that is a NOP on some platforms. -DaveM
*/
do {
unsigned char val = sbus_readb(&channel->control);
if (val & Tx_BUF_EMP) {
ZSDELAY();
break;
}
udelay(5);
} while (--loops);
sbus_writeb(ch, &channel->data);
ZSDELAY();
ZS_WSYNC(channel);
}
#ifdef CONFIG_SERIO
static DEFINE_SPINLOCK(sunzilog_serio_lock);
static int sunzilog_serio_write(struct serio *serio, unsigned char ch)
{
struct uart_sunzilog_port *up = serio->port_data;
unsigned long flags;
spin_lock_irqsave(&sunzilog_serio_lock, flags);
sunzilog_put_char(ZILOG_CHANNEL_FROM_PORT(&up->port), ch);
spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
return 0;
}
static int sunzilog_serio_open(struct serio *serio)
{
struct uart_sunzilog_port *up = serio->port_data;
unsigned long flags;
int ret;
spin_lock_irqsave(&sunzilog_serio_lock, flags);
if (!up->serio_open) {
up->serio_open = 1;
ret = 0;
} else
ret = -EBUSY;
spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
return ret;
}
static void sunzilog_serio_close(struct serio *serio)
{
struct uart_sunzilog_port *up = serio->port_data;
unsigned long flags;
spin_lock_irqsave(&sunzilog_serio_lock, flags);
up->serio_open = 0;
spin_unlock_irqrestore(&sunzilog_serio_lock, flags);
}
#endif /* CONFIG_SERIO */
#ifdef CONFIG_SERIAL_SUNZILOG_CONSOLE
static void
sunzilog_console_write(struct console *con, const char *s, unsigned int count)
{
struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
struct zilog_channel *channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
unsigned long flags;
int i;
spin_lock_irqsave(&up->port.lock, flags);
for (i = 0; i < count; i++, s++) {
sunzilog_put_char(channel, *s);
if (*s == 10)
sunzilog_put_char(channel, 13);
}
udelay(2);
spin_unlock_irqrestore(&up->port.lock, flags);
}
static int __init sunzilog_console_setup(struct console *con, char *options)
{
struct uart_sunzilog_port *up = &sunzilog_port_table[con->index];
unsigned long flags;
int baud, brg;
printk(KERN_INFO "Console: ttyS%d (SunZilog zs%d)\n",
(sunzilog_reg.minor - 64) + con->index, con->index);
/* Get firmware console settings. */
sunserial_console_termios(con);
/* Firmware console speed is limited to 150-->38400 baud so
* this hackish cflag thing is OK.
*/
switch (con->cflag & CBAUD) {
case B150: baud = 150; break;
case B300: baud = 300; break;
case B600: baud = 600; break;
case B1200: baud = 1200; break;
case B2400: baud = 2400; break;
case B4800: baud = 4800; break;
default: case B9600: baud = 9600; break;
case B19200: baud = 19200; break;
case B38400: baud = 38400; break;
};
brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
spin_lock_irqsave(&up->port.lock, flags);
up->curregs[R15] = BRKIE;
sunzilog_convert_to_zs(up, con->cflag, 0, brg);
sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
__sunzilog_startup(up);
spin_unlock_irqrestore(&up->port.lock, flags);
return 0;
}
static struct console sunzilog_console = {
.name = "ttyS",
.write = sunzilog_console_write,
.device = uart_console_device,
.setup = sunzilog_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &sunzilog_reg,
};
#define SUNZILOG_CONSOLE (&sunzilog_console)
static int __init sunzilog_console_init(void)
{
int i;
if (con_is_present())
return 0;
for (i = 0; i < NUM_CHANNELS; i++) {
int this_minor = sunzilog_reg.minor + i;
if ((this_minor - 64) == (serial_console - 1))
break;
}
if (i == NUM_CHANNELS)
return 0;
sunzilog_console.index = i;
sunzilog_port_table[i].flags |= SUNZILOG_FLAG_IS_CONS;
register_console(&sunzilog_console);
return 0;
}
#else
#define SUNZILOG_CONSOLE (NULL)
#define sunzilog_console_init() do { } while (0)
#endif
/*
* We scan the PROM tree recursively. This is the most reliable way
* to find Zilog nodes on various platforms. However, we face an extreme
* shortage of kernel stack, so we must be very careful. To that end,
* we scan only to a certain depth, and we use a common property buffer
* in the scan structure.
*/
#define ZS_PROPSIZE 128
#define ZS_SCAN_DEPTH 5
struct zs_probe_scan {
int depth;
void (*scanner)(struct zs_probe_scan *t, int node);
int devices;
char prop[ZS_PROPSIZE];
};
static int __inline__ sunzilog_node_ok(int node, const char *name, int len)
{
if (strncmp(name, "zs", len) == 0)
return 1;
/* Don't fold this procedure just yet. Compare to su_node_ok(). */
return 0;
}
static void __init sunzilog_scan(struct zs_probe_scan *t, int node)
{
int len;
for (; node != 0; node = prom_getsibling(node)) {
len = prom_getproperty(node, "name", t->prop, ZS_PROPSIZE);
if (len <= 1)
continue; /* Broken PROM node */
if (sunzilog_node_ok(node, t->prop, len)) {
(*t->scanner)(t, node);
} else {
if (t->depth < ZS_SCAN_DEPTH) {
t->depth++;
sunzilog_scan(t, prom_getchild(node));
--t->depth;
}
}
}
}
static void __init sunzilog_prepare(void)
{
struct uart_sunzilog_port *up;
struct zilog_layout __iomem *rp;
int channel, chip;
/*
* Temporary fix.
*/
for (channel = 0; channel < NUM_CHANNELS; channel++)
spin_lock_init(&sunzilog_port_table[channel].port.lock);
sunzilog_irq_chain = up = &sunzilog_port_table[0];
for (channel = 0; channel < NUM_CHANNELS - 1; channel++)
up[channel].next = &up[channel + 1];
up[channel].next = NULL;
for (chip = 0; chip < NUM_SUNZILOG; chip++) {
rp = sunzilog_chip_regs[chip];
up[(chip * 2) + 0].port.membase = (void __iomem *)&rp->channelA;
up[(chip * 2) + 1].port.membase = (void __iomem *)&rp->channelB;
/* Channel A */
up[(chip * 2) + 0].port.iotype = SERIAL_IO_MEM;
up[(chip * 2) + 0].port.irq = zilog_irq;
up[(chip * 2) + 0].port.uartclk = ZS_CLOCK;
up[(chip * 2) + 0].port.fifosize = 1;
up[(chip * 2) + 0].port.ops = &sunzilog_pops;
up[(chip * 2) + 0].port.type = PORT_SUNZILOG;
up[(chip * 2) + 0].port.flags = 0;
up[(chip * 2) + 0].port.line = (chip * 2) + 0;
up[(chip * 2) + 0].flags |= SUNZILOG_FLAG_IS_CHANNEL_A;
/* Channel B */
up[(chip * 2) + 1].port.iotype = SERIAL_IO_MEM;
up[(chip * 2) + 1].port.irq = zilog_irq;
up[(chip * 2) + 1].port.uartclk = ZS_CLOCK;
up[(chip * 2) + 1].port.fifosize = 1;
up[(chip * 2) + 1].port.ops = &sunzilog_pops;
up[(chip * 2) + 1].port.type = PORT_SUNZILOG;
up[(chip * 2) + 1].port.flags = 0;
up[(chip * 2) + 1].port.line = (chip * 2) + 1;
up[(chip * 2) + 1].flags |= 0;
}
}
static void __init sunzilog_init_kbdms(struct uart_sunzilog_port *up, int channel)
{
int baud, brg;
if (channel == KEYBOARD_LINE) {
up->flags |= SUNZILOG_FLAG_CONS_KEYB;
up->cflag = B1200 | CS8 | CLOCAL | CREAD;
baud = 1200;
} else {
up->flags |= SUNZILOG_FLAG_CONS_MOUSE;
up->cflag = B4800 | CS8 | CLOCAL | CREAD;
baud = 4800;
}
printk(KERN_INFO "zs%d at 0x%p (irq = %s) is a SunZilog\n",
channel, up->port.membase, __irq_itoa(zilog_irq));
up->curregs[R15] = BRKIE;
brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
sunzilog_convert_to_zs(up, up->cflag, 0, brg);
sunzilog_set_mctrl(&up->port, TIOCM_DTR | TIOCM_RTS);
__sunzilog_startup(up);
}
#ifdef CONFIG_SERIO
static void __init sunzilog_register_serio(struct uart_sunzilog_port *up, int channel)
{
struct serio *serio;
up->serio = serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
if (serio) {
memset(serio, 0, sizeof(*serio));
serio->port_data = up;
serio->id.type = SERIO_RS232;
if (channel == KEYBOARD_LINE) {
serio->id.proto = SERIO_SUNKBD;
strlcpy(serio->name, "zskbd", sizeof(serio->name));
} else {
serio->id.proto = SERIO_SUN;
serio->id.extra = 1;
strlcpy(serio->name, "zsms", sizeof(serio->name));
}
strlcpy(serio->phys,
(channel == KEYBOARD_LINE ? "zs/serio0" : "zs/serio1"),
sizeof(serio->phys));
serio->write = sunzilog_serio_write;
serio->open = sunzilog_serio_open;
serio->close = sunzilog_serio_close;
serio_register_port(serio);
} else {
printk(KERN_WARNING "zs%d: not enough memory for serio port\n",
channel);
}
}
#endif
static void __init sunzilog_init_hw(void)
{
int i;
for (i = 0; i < NUM_CHANNELS; i++) {
struct uart_sunzilog_port *up = &sunzilog_port_table[i];
struct zilog_channel __iomem *channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
unsigned long flags;
int baud, brg;
spin_lock_irqsave(&up->port.lock, flags);
if (ZS_IS_CHANNEL_A(up)) {
write_zsreg(channel, R9, FHWRES);
ZSDELAY_LONG();
(void) read_zsreg(channel, R0);
}
if (i == KEYBOARD_LINE || i == MOUSE_LINE) {
sunzilog_init_kbdms(up, i);
up->curregs[R9] |= (NV | MIE);
write_zsreg(channel, R9, up->curregs[R9]);
} else {
/* Normal serial TTY. */
up->parity_mask = 0xff;
up->curregs[R1] = EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB;
up->curregs[R4] = PAR_EVEN | X16CLK | SB1;
up->curregs[R3] = RxENAB | Rx8;
up->curregs[R5] = TxENAB | Tx8;
up->curregs[R9] = NV | MIE;
up->curregs[R10] = NRZ;
up->curregs[R11] = TCBR | RCBR;
baud = 9600;
brg = BPS_TO_BRG(baud, ZS_CLOCK / ZS_CLOCK_DIVISOR);
up->curregs[R12] = (brg & 0xff);
up->curregs[R13] = (brg >> 8) & 0xff;
up->curregs[R14] = BRSRC | BRENAB;
__load_zsregs(channel, up->curregs);
write_zsreg(channel, R9, up->curregs[R9]);
}
spin_unlock_irqrestore(&up->port.lock, flags);
#ifdef CONFIG_SERIO
if (i == KEYBOARD_LINE || i == MOUSE_LINE)
sunzilog_register_serio(up, i);
#endif
}
}
static struct zilog_layout __iomem * __init get_zs(int chip, int node);
static void __init sunzilog_scan_probe(struct zs_probe_scan *t, int node)
{
sunzilog_chip_regs[t->devices] = get_zs(t->devices, node);
t->devices++;
}
static int __init sunzilog_ports_init(void)
{
struct zs_probe_scan scan;
int ret;
int uart_count;
int i;
printk(KERN_DEBUG "SunZilog: %d chips.\n", NUM_SUNZILOG);
scan.scanner = sunzilog_scan_probe;
scan.depth = 0;
scan.devices = 0;
sunzilog_scan(&scan, prom_getchild(prom_root_node));
sunzilog_prepare();
if (request_irq(zilog_irq, sunzilog_interrupt, SA_SHIRQ,
"SunZilog", sunzilog_irq_chain)) {
prom_printf("SunZilog: Unable to register zs interrupt handler.\n");
prom_halt();
}
sunzilog_init_hw();
/* We can only init this once we have probed the Zilogs
* in the system. Do not count channels assigned to keyboards
* or mice when we are deciding how many ports to register.
*/
uart_count = 0;
for (i = 0; i < NUM_CHANNELS; i++) {
struct uart_sunzilog_port *up = &sunzilog_port_table[i];
if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up))
continue;
uart_count++;
}
sunzilog_reg.nr = uart_count;
sunzilog_reg.cons = SUNZILOG_CONSOLE;
sunzilog_reg.minor = sunserial_current_minor;
sunserial_current_minor += uart_count;
ret = uart_register_driver(&sunzilog_reg);
if (ret == 0) {
sunzilog_console_init();
for (i = 0; i < NUM_CHANNELS; i++) {
struct uart_sunzilog_port *up = &sunzilog_port_table[i];
if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up))
continue;
if (uart_add_one_port(&sunzilog_reg, &up->port)) {
printk(KERN_ERR
"SunZilog: failed to add port zs%d\n", i);
}
}
}
return ret;
}
static void __init sunzilog_scan_count(struct zs_probe_scan *t, int node)
{
t->devices++;
}
static int __init sunzilog_ports_count(void)
{
struct zs_probe_scan scan;
/* Sun4 Zilog setup is hard coded, no probing to do. */
if (sparc_cpu_model == sun4)
return 2;
scan.scanner = sunzilog_scan_count;
scan.depth = 0;
scan.devices = 0;
sunzilog_scan(&scan, prom_getchild(prom_root_node));
return scan.devices;
}
static int __init sunzilog_init(void)
{
NUM_SUNZILOG = sunzilog_ports_count();
if (NUM_SUNZILOG == 0)
return -ENODEV;
sunzilog_alloc_tables();
sunzilog_ports_init();
return 0;
}
static void __exit sunzilog_exit(void)
{
int i;
for (i = 0; i < NUM_CHANNELS; i++) {
struct uart_sunzilog_port *up = &sunzilog_port_table[i];
if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
#ifdef CONFIG_SERIO
if (up->serio) {
serio_unregister_port(up->serio);
up->serio = NULL;
}
#endif
} else
uart_remove_one_port(&sunzilog_reg, &up->port);
}
uart_unregister_driver(&sunzilog_reg);
}
module_init(sunzilog_init);
module_exit(sunzilog_exit);
MODULE_AUTHOR("David S. Miller");
MODULE_DESCRIPTION("Sun Zilog serial port driver");
MODULE_LICENSE("GPL");
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