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linux/drivers/serial/sunsu.c
Alan Cox 33f0f88f1c [PATCH] TTY layer buffering revamp 
The API and code have been through various bits of initial review by
serial driver people but they definitely need to live somewhere for a
while so the unconverted drivers can get knocked into shape, existing
drivers that have been updated can be better tuned and bugs whacked out.

This replaces the tty flip buffers with kmalloc objects in rings. In the
normal situation for an IRQ driven serial port at typical speeds the
behaviour is pretty much the same, two buffers end up allocated and the
kernel cycles between them as before.

When there are delays or at high speed we now behave far better as the
buffer pool can grow a bit rather than lose characters. This also means
that we can operate at higher speeds reliably.

For drivers that receive characters in blocks (DMA based, USB and
especially virtualisation) the layer allows a lot of driver specific
code that works around the tty layer with private secondary queues to be
removed. The IBM folks need this sort of layer, the smart serial port
people do, the virtualisers do (because a virtualised tty typically
operates at infinite speed rather than emulating 9600 baud).

Finally many drivers had invalid and unsafe attempts to avoid buffer
overflows by directly invoking tty methods extracted out of the innards
of work queue structs. These are no longer needed and all go away. That
fixes various random hangs with serial ports on overflow.

The other change in here is to optimise the receive_room path that is
used by some callers. It turns out that only one ldisc uses receive room
except asa constant and it updates it far far less than the value is
read. We thus make it a variable not a function call.

I expect the code to contain bugs due to the size alone but I'll be
watching and squashing them and feeding out new patches as it goes.

Because the buffers now dynamically expand you should only run out of
buffering when the kernel runs out of memory for real.  That means a lot of
the horrible hacks high performance drivers used to do just aren't needed any
more.

Description:

tty_insert_flip_char is an old API and continues to work as before, as does
tty_flip_buffer_push() [this is why many drivers dont need modification].  It
does now also return the number of chars inserted

There are also

tty_buffer_request_room(tty, len)

which asks for a buffer block of the length requested and returns the space
found.  This improves efficiency with hardware that knows how much to
transfer.

and tty_insert_flip_string_flags(tty, str, flags, len)

to insert a string of characters and flags

For a smart interface the usual code is

    len = tty_request_buffer_room(tty, amount_hardware_says);
    tty_insert_flip_string(tty, buffer_from_card, len);

More description!

At the moment tty buffers are attached directly to the tty.  This is causing a
lot of the problems related to tty layer locking, also problems at high speed
and also with bursty data (such as occurs in virtualised environments)

I'm working on ripping out the flip buffers and replacing them with a pool of
dynamically allocated buffers.  This allows both for old style "byte I/O"
devices and also helps virtualisation and smart devices where large blocks of
data suddenely materialise and need storing.

So far so good.  Lots of drivers reference tty->flip.*.  Several of them also
call directly and unsafely into function pointers it provides.  This will all
break.  Most drivers can use tty_insert_flip_char which can be kept as an API
but others need more.

At the moment I've added the following interfaces, if people think more will
be needed now is a good time to say

 int tty_buffer_request_room(tty, size)

Try and ensure at least size bytes are available, returns actual room (may be
zero).  At the moment it just uses the flipbuf space but that will change.
Repeated calls without characters being added are not cumulative.  (ie if you
call it with 1, 1, 1, and then 4 you'll have four characters of space.  The
other functions will also try and grow buffers in future but this will be a
more efficient way when you know block sizes.

 int tty_insert_flip_char(tty, ch, flag)

As before insert a character if there is room.  Now returns 1 for success, 0
for failure.

 int tty_insert_flip_string(tty, str, len)

Insert a block of non error characters.  Returns the number inserted.

 int tty_prepare_flip_string(tty, strptr, len)

Adjust the buffer to allow len characters to be added.  Returns a buffer
pointer in strptr and the length available.  This allows for hardware that
needs to use functions like insl or mencpy_fromio.

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: John Hawkes <hawkes@sgi.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:59 -08:00

1742 lines
42 KiB
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/* $Id: su.c,v 1.55 2002/01/08 16:00:16 davem Exp $
* su.c: Small serial driver for keyboard/mouse interface on sparc32/PCI
*
* Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
* Copyright (C) 1998-1999 Pete Zaitcev (zaitcev@yahoo.com)
*
* This is mainly a variation of 8250.c, credits go to authors mentioned
* therein. In fact this driver should be merged into the generic 8250.c
* infrastructure perhaps using a 8250_sparc.c module.
*
* Fixed to use tty_get_baud_rate().
* Theodore Ts'o <tytso@mit.edu>, 2001-Oct-12
*
* Converted to new 2.5.x UART layer.
* David S. Miller (davem@redhat.com), 2002-Jul-29
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/errno.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/circ_buf.h>
#include <linux/serial.h>
#include <linux/sysrq.h>
#include <linux/console.h>
#ifdef CONFIG_SERIO
#include <linux/serio.h>
#endif
#include <linux/serial_reg.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/oplib.h>
#include <asm/ebus.h>
#ifdef CONFIG_SPARC64
#include <asm/isa.h>
#endif
#if defined(CONFIG_SERIAL_SUNSU_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/serial_core.h>
#include "suncore.h"
/* We are on a NS PC87303 clocked with 24.0 MHz, which results
* in a UART clock of 1.8462 MHz.
*/
#define SU_BASE_BAUD (1846200 / 16)
enum su_type { SU_PORT_NONE, SU_PORT_MS, SU_PORT_KBD, SU_PORT_PORT };
static char *su_typev[] = { "su(???)", "su(mouse)", "su(kbd)", "su(serial)" };
/*
* Here we define the default xmit fifo size used for each type of UART.
*/
static const struct serial_uart_config uart_config[PORT_MAX_8250+1] = {
{ "unknown", 1, 0 },
{ "8250", 1, 0 },
{ "16450", 1, 0 },
{ "16550", 1, 0 },
{ "16550A", 16, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "Cirrus", 1, 0 },
{ "ST16650", 1, UART_CLEAR_FIFO | UART_STARTECH },
{ "ST16650V2", 32, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
{ "TI16750", 64, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "Startech", 1, 0 },
{ "16C950/954", 128, UART_CLEAR_FIFO | UART_USE_FIFO },
{ "ST16654", 64, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
{ "XR16850", 128, UART_CLEAR_FIFO | UART_USE_FIFO | UART_STARTECH },
{ "RSA", 2048, UART_CLEAR_FIFO | UART_USE_FIFO }
};
struct uart_sunsu_port {
struct uart_port port;
unsigned char acr;
unsigned char ier;
unsigned short rev;
unsigned char lcr;
unsigned int lsr_break_flag;
unsigned int cflag;
/* Probing information. */
enum su_type su_type;
unsigned int type_probed; /* XXX Stupid */
int port_node;
#ifdef CONFIG_SERIO
struct serio *serio;
int serio_open;
#endif
};
#define _INLINE_
static _INLINE_ unsigned int serial_in(struct uart_sunsu_port *up, int offset)
{
offset <<= up->port.regshift;
switch (up->port.iotype) {
case SERIAL_IO_HUB6:
outb(up->port.hub6 - 1 + offset, up->port.iobase);
return inb(up->port.iobase + 1);
case SERIAL_IO_MEM:
return readb(up->port.membase + offset);
default:
return inb(up->port.iobase + offset);
}
}
static _INLINE_ void
serial_out(struct uart_sunsu_port *up, int offset, int value)
{
#ifndef CONFIG_SPARC64
/*
* MrCoffee has weird schematics: IRQ4 & P10(?) pins of SuperIO are
* connected with a gate then go to SlavIO. When IRQ4 goes tristated
* gate outputs a logical one. Since we use level triggered interrupts
* we have lockup and watchdog reset. We cannot mask IRQ because
* keyboard shares IRQ with us (Word has it as Bob Smelik's design).
* This problem is similar to what Alpha people suffer, see serial.c.
*/
if (offset == UART_MCR)
value |= UART_MCR_OUT2;
#endif
offset <<= up->port.regshift;
switch (up->port.iotype) {
case SERIAL_IO_HUB6:
outb(up->port.hub6 - 1 + offset, up->port.iobase);
outb(value, up->port.iobase + 1);
break;
case SERIAL_IO_MEM:
writeb(value, up->port.membase + offset);
break;
default:
outb(value, up->port.iobase + offset);
}
}
/*
* We used to support using pause I/O for certain machines. We
* haven't supported this for a while, but just in case it's badly
* needed for certain old 386 machines, I've left these #define's
* in....
*/
#define serial_inp(up, offset) serial_in(up, offset)
#define serial_outp(up, offset, value) serial_out(up, offset, value)
/*
* For the 16C950
*/
static void serial_icr_write(struct uart_sunsu_port *up, int offset, int value)
{
serial_out(up, UART_SCR, offset);
serial_out(up, UART_ICR, value);
}
#if 0 /* Unused currently */
static unsigned int serial_icr_read(struct uart_sunsu_port *up, int offset)
{
unsigned int value;
serial_icr_write(up, UART_ACR, up->acr | UART_ACR_ICRRD);
serial_out(up, UART_SCR, offset);
value = serial_in(up, UART_ICR);
serial_icr_write(up, UART_ACR, up->acr);
return value;
}
#endif
#ifdef CONFIG_SERIAL_8250_RSA
/*
* Attempts to turn on the RSA FIFO. Returns zero on failure.
* We set the port uart clock rate if we succeed.
*/
static int __enable_rsa(struct uart_sunsu_port *up)
{
unsigned char mode;
int result;
mode = serial_inp(up, UART_RSA_MSR);
result = mode & UART_RSA_MSR_FIFO;
if (!result) {
serial_outp(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
mode = serial_inp(up, UART_RSA_MSR);
result = mode & UART_RSA_MSR_FIFO;
}
if (result)
up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
return result;
}
static void enable_rsa(struct uart_sunsu_port *up)
{
if (up->port.type == PORT_RSA) {
if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
spin_lock_irq(&up->port.lock);
__enable_rsa(up);
spin_unlock_irq(&up->port.lock);
}
if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
serial_outp(up, UART_RSA_FRR, 0);
}
}
/*
* Attempts to turn off the RSA FIFO. Returns zero on failure.
* It is unknown why interrupts were disabled in here. However,
* the caller is expected to preserve this behaviour by grabbing
* the spinlock before calling this function.
*/
static void disable_rsa(struct uart_sunsu_port *up)
{
unsigned char mode;
int result;
if (up->port.type == PORT_RSA &&
up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16) {
spin_lock_irq(&up->port.lock);
mode = serial_inp(up, UART_RSA_MSR);
result = !(mode & UART_RSA_MSR_FIFO);
if (!result) {
serial_outp(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
mode = serial_inp(up, UART_RSA_MSR);
result = !(mode & UART_RSA_MSR_FIFO);
}
if (result)
up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
spin_unlock_irq(&up->port.lock);
}
}
#endif /* CONFIG_SERIAL_8250_RSA */
static inline void __stop_tx(struct uart_sunsu_port *p)
{
if (p->ier & UART_IER_THRI) {
p->ier &= ~UART_IER_THRI;
serial_out(p, UART_IER, p->ier);
}
}
static void sunsu_stop_tx(struct uart_port *port)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
__stop_tx(up);
/*
* We really want to stop the transmitter from sending.
*/
if (up->port.type == PORT_16C950) {
up->acr |= UART_ACR_TXDIS;
serial_icr_write(up, UART_ACR, up->acr);
}
}
static void sunsu_start_tx(struct uart_port *port)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
if (!(up->ier & UART_IER_THRI)) {
up->ier |= UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
}
/*
* Re-enable the transmitter if we disabled it.
*/
if (up->port.type == PORT_16C950 && up->acr & UART_ACR_TXDIS) {
up->acr &= ~UART_ACR_TXDIS;
serial_icr_write(up, UART_ACR, up->acr);
}
}
static void sunsu_stop_rx(struct uart_port *port)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
unsigned long flags;
spin_lock_irqsave(&up->port.lock, flags);
up->ier &= ~UART_IER_RLSI;
up->port.read_status_mask &= ~UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
spin_unlock_irqrestore(&up->port.lock, flags);
}
static void sunsu_enable_ms(struct uart_port *port)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
unsigned long flags;
spin_lock_irqsave(&up->port.lock, flags);
up->ier |= UART_IER_MSI;
serial_out(up, UART_IER, up->ier);
spin_unlock_irqrestore(&up->port.lock, flags);
}
static _INLINE_ struct tty_struct *
receive_chars(struct uart_sunsu_port *up, unsigned char *status, struct pt_regs *regs)
{
struct tty_struct *tty = up->port.info->tty;
unsigned char ch, flag;
int max_count = 256;
int saw_console_brk = 0;
do {
ch = serial_inp(up, UART_RX);
flag = TTY_NORMAL;
up->port.icount.rx++;
if (unlikely(*status & (UART_LSR_BI | UART_LSR_PE |
UART_LSR_FE | UART_LSR_OE))) {
/*
* For statistics only
*/
if (*status & UART_LSR_BI) {
*status &= ~(UART_LSR_FE | UART_LSR_PE);
up->port.icount.brk++;
if (up->port.cons != NULL &&
up->port.line == up->port.cons->index)
saw_console_brk = 1;
/*
* We do the SysRQ and SAK checking
* here because otherwise the break
* may get masked by ignore_status_mask
* or read_status_mask.
*/
if (uart_handle_break(&up->port))
goto ignore_char;
} else if (*status & UART_LSR_PE)
up->port.icount.parity++;
else if (*status & UART_LSR_FE)
up->port.icount.frame++;
if (*status & UART_LSR_OE)
up->port.icount.overrun++;
/*
* Mask off conditions which should be ingored.
*/
*status &= up->port.read_status_mask;
if (up->port.cons != NULL &&
up->port.line == up->port.cons->index) {
/* Recover the break flag from console xmit */
*status |= up->lsr_break_flag;
up->lsr_break_flag = 0;
}
if (*status & UART_LSR_BI) {
flag = TTY_BREAK;
} else if (*status & UART_LSR_PE)
flag = TTY_PARITY;
else if (*status & UART_LSR_FE)
flag = TTY_FRAME;
}
if (uart_handle_sysrq_char(&up->port, ch, regs))
goto ignore_char;
if ((*status & up->port.ignore_status_mask) == 0)
tty_insert_flip_char(tty, ch, flag);
if (*status & UART_LSR_OE)
/*
* Overrun is special, since it's reported
* immediately, and doesn't affect the current
* character.
*/
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
ignore_char:
*status = serial_inp(up, UART_LSR);
} while ((*status & UART_LSR_DR) && (max_count-- > 0));
if (saw_console_brk)
sun_do_break();
return tty;
}
static _INLINE_ void transmit_chars(struct uart_sunsu_port *up)
{
struct circ_buf *xmit = &up->port.info->xmit;
int count;
if (up->port.x_char) {
serial_outp(up, UART_TX, up->port.x_char);
up->port.icount.tx++;
up->port.x_char = 0;
return;
}
if (uart_tx_stopped(&up->port)) {
sunsu_stop_tx(&up->port);
return;
}
if (uart_circ_empty(xmit)) {
__stop_tx(up);
return;
}
count = up->port.fifosize;
do {
serial_out(up, UART_TX, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
up->port.icount.tx++;
if (uart_circ_empty(xmit))
break;
} while (--count > 0);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&up->port);
if (uart_circ_empty(xmit))
__stop_tx(up);
}
static _INLINE_ void check_modem_status(struct uart_sunsu_port *up)
{
int status;
status = serial_in(up, UART_MSR);
if ((status & UART_MSR_ANY_DELTA) == 0)
return;
if (status & UART_MSR_TERI)
up->port.icount.rng++;
if (status & UART_MSR_DDSR)
up->port.icount.dsr++;
if (status & UART_MSR_DDCD)
uart_handle_dcd_change(&up->port, status & UART_MSR_DCD);
if (status & UART_MSR_DCTS)
uart_handle_cts_change(&up->port, status & UART_MSR_CTS);
wake_up_interruptible(&up->port.info->delta_msr_wait);
}
static irqreturn_t sunsu_serial_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_sunsu_port *up = dev_id;
unsigned long flags;
unsigned char status;
spin_lock_irqsave(&up->port.lock, flags);
do {
struct tty_struct *tty;
status = serial_inp(up, UART_LSR);
tty = NULL;
if (status & UART_LSR_DR)
tty = receive_chars(up, &status, regs);
check_modem_status(up);
if (status & UART_LSR_THRE)
transmit_chars(up);
spin_unlock_irqrestore(&up->port.lock, flags);
if (tty)
tty_flip_buffer_push(tty);
spin_lock_irqsave(&up->port.lock, flags);
} while (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT));
spin_unlock_irqrestore(&up->port.lock, flags);
return IRQ_HANDLED;
}
/* Separate interrupt handling path for keyboard/mouse ports. */
static void
sunsu_change_speed(struct uart_port *port, unsigned int cflag,
unsigned int iflag, unsigned int quot);
static void sunsu_change_mouse_baud(struct uart_sunsu_port *up)
{
unsigned int cur_cflag = up->cflag;
int quot, new_baud;
up->cflag &= ~CBAUD;
up->cflag |= suncore_mouse_baud_cflag_next(cur_cflag, &new_baud);
quot = up->port.uartclk / (16 * new_baud);
sunsu_change_speed(&up->port, up->cflag, 0, quot);
}
static void receive_kbd_ms_chars(struct uart_sunsu_port *up, struct pt_regs *regs, int is_break)
{
do {
unsigned char ch = serial_inp(up, UART_RX);
/* Stop-A is handled by drivers/char/keyboard.c now. */
if (up->su_type == SU_PORT_KBD) {
#ifdef CONFIG_SERIO
serio_interrupt(up->serio, ch, 0, regs);
#endif
} else if (up->su_type == SU_PORT_MS) {
int ret = suncore_mouse_baud_detection(ch, is_break);
switch (ret) {
case 2:
sunsu_change_mouse_baud(up);
/* fallthru */
case 1:
break;
case 0:
#ifdef CONFIG_SERIO
serio_interrupt(up->serio, ch, 0, regs);
#endif
break;
};
}
} while (serial_in(up, UART_LSR) & UART_LSR_DR);
}
static irqreturn_t sunsu_kbd_ms_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_sunsu_port *up = dev_id;
if (!(serial_in(up, UART_IIR) & UART_IIR_NO_INT)) {
unsigned char status = serial_inp(up, UART_LSR);
if ((status & UART_LSR_DR) || (status & UART_LSR_BI))
receive_kbd_ms_chars(up, regs,
(status & UART_LSR_BI) != 0);
}
return IRQ_HANDLED;
}
static unsigned int sunsu_tx_empty(struct uart_port *port)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
unsigned long flags;
unsigned int ret;
spin_lock_irqsave(&up->port.lock, flags);
ret = serial_in(up, UART_LSR) & UART_LSR_TEMT ? TIOCSER_TEMT : 0;
spin_unlock_irqrestore(&up->port.lock, flags);
return ret;
}
static unsigned int sunsu_get_mctrl(struct uart_port *port)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
unsigned char status;
unsigned int ret;
status = serial_in(up, UART_MSR);
ret = 0;
if (status & UART_MSR_DCD)
ret |= TIOCM_CAR;
if (status & UART_MSR_RI)
ret |= TIOCM_RNG;
if (status & UART_MSR_DSR)
ret |= TIOCM_DSR;
if (status & UART_MSR_CTS)
ret |= TIOCM_CTS;
return ret;
}
static void sunsu_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
unsigned char mcr = 0;
if (mctrl & TIOCM_RTS)
mcr |= UART_MCR_RTS;
if (mctrl & TIOCM_DTR)
mcr |= UART_MCR_DTR;
if (mctrl & TIOCM_OUT1)
mcr |= UART_MCR_OUT1;
if (mctrl & TIOCM_OUT2)
mcr |= UART_MCR_OUT2;
if (mctrl & TIOCM_LOOP)
mcr |= UART_MCR_LOOP;
serial_out(up, UART_MCR, mcr);
}
static void sunsu_break_ctl(struct uart_port *port, int break_state)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
unsigned long flags;
spin_lock_irqsave(&up->port.lock, flags);
if (break_state == -1)
up->lcr |= UART_LCR_SBC;
else
up->lcr &= ~UART_LCR_SBC;
serial_out(up, UART_LCR, up->lcr);
spin_unlock_irqrestore(&up->port.lock, flags);
}
static int sunsu_startup(struct uart_port *port)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
unsigned long flags;
int retval;
if (up->port.type == PORT_16C950) {
/* Wake up and initialize UART */
up->acr = 0;
serial_outp(up, UART_LCR, 0xBF);
serial_outp(up, UART_EFR, UART_EFR_ECB);
serial_outp(up, UART_IER, 0);
serial_outp(up, UART_LCR, 0);
serial_icr_write(up, UART_CSR, 0); /* Reset the UART */
serial_outp(up, UART_LCR, 0xBF);
serial_outp(up, UART_EFR, UART_EFR_ECB);
serial_outp(up, UART_LCR, 0);
}
#ifdef CONFIG_SERIAL_8250_RSA
/*
* If this is an RSA port, see if we can kick it up to the
* higher speed clock.
*/
enable_rsa(up);
#endif
/*
* Clear the FIFO buffers and disable them.
* (they will be reeanbled in set_termios())
*/
if (uart_config[up->port.type].flags & UART_CLEAR_FIFO) {
serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
serial_outp(up, UART_FCR, 0);
}
/*
* Clear the interrupt registers.
*/
(void) serial_inp(up, UART_LSR);
(void) serial_inp(up, UART_RX);
(void) serial_inp(up, UART_IIR);
(void) serial_inp(up, UART_MSR);
/*
* At this point, there's no way the LSR could still be 0xff;
* if it is, then bail out, because there's likely no UART
* here.
*/
if (!(up->port.flags & ASYNC_BUGGY_UART) &&
(serial_inp(up, UART_LSR) == 0xff)) {
printk("ttyS%d: LSR safety check engaged!\n", up->port.line);
return -ENODEV;
}
if (up->su_type != SU_PORT_PORT) {
retval = request_irq(up->port.irq, sunsu_kbd_ms_interrupt,
SA_SHIRQ, su_typev[up->su_type], up);
} else {
retval = request_irq(up->port.irq, sunsu_serial_interrupt,
SA_SHIRQ, su_typev[up->su_type], up);
}
if (retval) {
printk("su: Cannot register IRQ %d\n", up->port.irq);
return retval;
}
/*
* Now, initialize the UART
*/
serial_outp(up, UART_LCR, UART_LCR_WLEN8);
spin_lock_irqsave(&up->port.lock, flags);
up->port.mctrl |= TIOCM_OUT2;
sunsu_set_mctrl(&up->port, up->port.mctrl);
spin_unlock_irqrestore(&up->port.lock, flags);
/*
* Finally, enable interrupts. Note: Modem status interrupts
* are set via set_termios(), which will be occurring imminently
* anyway, so we don't enable them here.
*/
up->ier = UART_IER_RLSI | UART_IER_RDI;
serial_outp(up, UART_IER, up->ier);
if (up->port.flags & ASYNC_FOURPORT) {
unsigned int icp;
/*
* Enable interrupts on the AST Fourport board
*/
icp = (up->port.iobase & 0xfe0) | 0x01f;
outb_p(0x80, icp);
(void) inb_p(icp);
}
/*
* And clear the interrupt registers again for luck.
*/
(void) serial_inp(up, UART_LSR);
(void) serial_inp(up, UART_RX);
(void) serial_inp(up, UART_IIR);
(void) serial_inp(up, UART_MSR);
return 0;
}
static void sunsu_shutdown(struct uart_port *port)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
unsigned long flags;
/*
* Disable interrupts from this port
*/
up->ier = 0;
serial_outp(up, UART_IER, 0);
spin_lock_irqsave(&up->port.lock, flags);
if (up->port.flags & ASYNC_FOURPORT) {
/* reset interrupts on the AST Fourport board */
inb((up->port.iobase & 0xfe0) | 0x1f);
up->port.mctrl |= TIOCM_OUT1;
} else
up->port.mctrl &= ~TIOCM_OUT2;
sunsu_set_mctrl(&up->port, up->port.mctrl);
spin_unlock_irqrestore(&up->port.lock, flags);
/*
* Disable break condition and FIFOs
*/
serial_out(up, UART_LCR, serial_inp(up, UART_LCR) & ~UART_LCR_SBC);
serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO |
UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT);
serial_outp(up, UART_FCR, 0);
#ifdef CONFIG_SERIAL_8250_RSA
/*
* Reset the RSA board back to 115kbps compat mode.
*/
disable_rsa(up);
#endif
/*
* Read data port to reset things.
*/
(void) serial_in(up, UART_RX);
free_irq(up->port.irq, up);
}
static void
sunsu_change_speed(struct uart_port *port, unsigned int cflag,
unsigned int iflag, unsigned int quot)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
unsigned char cval, fcr = 0;
unsigned long flags;
switch (cflag & CSIZE) {
case CS5:
cval = 0x00;
break;
case CS6:
cval = 0x01;
break;
case CS7:
cval = 0x02;
break;
default:
case CS8:
cval = 0x03;
break;
}
if (cflag & CSTOPB)
cval |= 0x04;
if (cflag & PARENB)
cval |= UART_LCR_PARITY;
if (!(cflag & PARODD))
cval |= UART_LCR_EPAR;
#ifdef CMSPAR
if (cflag & CMSPAR)
cval |= UART_LCR_SPAR;
#endif
/*
* Work around a bug in the Oxford Semiconductor 952 rev B
* chip which causes it to seriously miscalculate baud rates
* when DLL is 0.
*/
if ((quot & 0xff) == 0 && up->port.type == PORT_16C950 &&
up->rev == 0x5201)
quot ++;
if (uart_config[up->port.type].flags & UART_USE_FIFO) {
if ((up->port.uartclk / quot) < (2400 * 16))
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_1;
#ifdef CONFIG_SERIAL_8250_RSA
else if (up->port.type == PORT_RSA)
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_14;
#endif
else
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_TRIGGER_8;
}
if (up->port.type == PORT_16750)
fcr |= UART_FCR7_64BYTE;
/*
* Ok, we're now changing the port state. Do it with
* interrupts disabled.
*/
spin_lock_irqsave(&up->port.lock, flags);
/*
* Update the per-port timeout.
*/
uart_update_timeout(port, cflag, (port->uartclk / (16 * quot)));
up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (iflag & INPCK)
up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
if (iflag & (BRKINT | PARMRK))
up->port.read_status_mask |= UART_LSR_BI;
/*
* Characteres to ignore
*/
up->port.ignore_status_mask = 0;
if (iflag & IGNPAR)
up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
if (iflag & IGNBRK) {
up->port.ignore_status_mask |= UART_LSR_BI;
/*
* If we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
if (iflag & IGNPAR)
up->port.ignore_status_mask |= UART_LSR_OE;
}
/*
* ignore all characters if CREAD is not set
*/
if ((cflag & CREAD) == 0)
up->port.ignore_status_mask |= UART_LSR_DR;
/*
* CTS flow control flag and modem status interrupts
*/
up->ier &= ~UART_IER_MSI;
if (UART_ENABLE_MS(&up->port, cflag))
up->ier |= UART_IER_MSI;
serial_out(up, UART_IER, up->ier);
if (uart_config[up->port.type].flags & UART_STARTECH) {
serial_outp(up, UART_LCR, 0xBF);
serial_outp(up, UART_EFR, cflag & CRTSCTS ? UART_EFR_CTS :0);
}
serial_outp(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
serial_outp(up, UART_DLL, quot & 0xff); /* LS of divisor */
serial_outp(up, UART_DLM, quot >> 8); /* MS of divisor */
if (up->port.type == PORT_16750)
serial_outp(up, UART_FCR, fcr); /* set fcr */
serial_outp(up, UART_LCR, cval); /* reset DLAB */
up->lcr = cval; /* Save LCR */
if (up->port.type != PORT_16750) {
if (fcr & UART_FCR_ENABLE_FIFO) {
/* emulated UARTs (Lucent Venus 167x) need two steps */
serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
}
serial_outp(up, UART_FCR, fcr); /* set fcr */
}
up->cflag = cflag;
spin_unlock_irqrestore(&up->port.lock, flags);
}
static void
sunsu_set_termios(struct uart_port *port, struct termios *termios,
struct termios *old)
{
unsigned int baud, quot;
/*
* Ask the core to calculate the divisor for us.
*/
baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
quot = uart_get_divisor(port, baud);
sunsu_change_speed(port, termios->c_cflag, termios->c_iflag, quot);
}
static void sunsu_release_port(struct uart_port *port)
{
}
static int sunsu_request_port(struct uart_port *port)
{
return 0;
}
static void sunsu_config_port(struct uart_port *port, int flags)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
if (flags & UART_CONFIG_TYPE) {
/*
* We are supposed to call autoconfig here, but this requires
* splitting all the OBP probing crap from the UART probing.
* We'll do it when we kill sunsu.c altogether.
*/
port->type = up->type_probed; /* XXX */
}
}
static int
sunsu_verify_port(struct uart_port *port, struct serial_struct *ser)
{
return -EINVAL;
}
static const char *
sunsu_type(struct uart_port *port)
{
int type = port->type;
if (type >= ARRAY_SIZE(uart_config))
type = 0;
return uart_config[type].name;
}
static struct uart_ops sunsu_pops = {
.tx_empty = sunsu_tx_empty,
.set_mctrl = sunsu_set_mctrl,
.get_mctrl = sunsu_get_mctrl,
.stop_tx = sunsu_stop_tx,
.start_tx = sunsu_start_tx,
.stop_rx = sunsu_stop_rx,
.enable_ms = sunsu_enable_ms,
.break_ctl = sunsu_break_ctl,
.startup = sunsu_startup,
.shutdown = sunsu_shutdown,
.set_termios = sunsu_set_termios,
.type = sunsu_type,
.release_port = sunsu_release_port,
.request_port = sunsu_request_port,
.config_port = sunsu_config_port,
.verify_port = sunsu_verify_port,
};
#define UART_NR 4
static struct uart_sunsu_port sunsu_ports[UART_NR];
#ifdef CONFIG_SERIO
static DEFINE_SPINLOCK(sunsu_serio_lock);
static int sunsu_serio_write(struct serio *serio, unsigned char ch)
{
struct uart_sunsu_port *up = serio->port_data;
unsigned long flags;
int lsr;
spin_lock_irqsave(&sunsu_serio_lock, flags);
do {
lsr = serial_in(up, UART_LSR);
} while (!(lsr & UART_LSR_THRE));
/* Send the character out. */
serial_out(up, UART_TX, ch);
spin_unlock_irqrestore(&sunsu_serio_lock, flags);
return 0;
}
static int sunsu_serio_open(struct serio *serio)
{
struct uart_sunsu_port *up = serio->port_data;
unsigned long flags;
int ret;
spin_lock_irqsave(&sunsu_serio_lock, flags);
if (!up->serio_open) {
up->serio_open = 1;
ret = 0;
} else
ret = -EBUSY;
spin_unlock_irqrestore(&sunsu_serio_lock, flags);
return ret;
}
static void sunsu_serio_close(struct serio *serio)
{
struct uart_sunsu_port *up = serio->port_data;
unsigned long flags;
spin_lock_irqsave(&sunsu_serio_lock, flags);
up->serio_open = 0;
spin_unlock_irqrestore(&sunsu_serio_lock, flags);
}
#endif /* CONFIG_SERIO */
static void sunsu_autoconfig(struct uart_sunsu_port *up)
{
unsigned char status1, status2, scratch, scratch2, scratch3;
unsigned char save_lcr, save_mcr;
struct linux_ebus_device *dev = NULL;
struct linux_ebus *ebus;
#ifdef CONFIG_SPARC64
struct sparc_isa_bridge *isa_br;
struct sparc_isa_device *isa_dev;
#endif
#ifndef CONFIG_SPARC64
struct linux_prom_registers reg0;
#endif
unsigned long flags;
if (!up->port_node || !up->su_type)
return;
up->type_probed = PORT_UNKNOWN;
up->port.iotype = SERIAL_IO_MEM;
/*
* First we look for Ebus-bases su's
*/
for_each_ebus(ebus) {
for_each_ebusdev(dev, ebus) {
if (dev->prom_node == up->port_node) {
/*
* The EBus is broken on sparc; it delivers
* virtual addresses in resources. Oh well...
* This is correct on sparc64, though.
*/
up->port.membase = (char *) dev->resource[0].start;
/*
* This is correct on both architectures.
*/
up->port.mapbase = dev->resource[0].start;
up->port.irq = dev->irqs[0];
goto ebus_done;
}
}
}
#ifdef CONFIG_SPARC64
for_each_isa(isa_br) {
for_each_isadev(isa_dev, isa_br) {
if (isa_dev->prom_node == up->port_node) {
/* Same on sparc64. Cool architecure... */
up->port.membase = (char *) isa_dev->resource.start;
up->port.mapbase = isa_dev->resource.start;
up->port.irq = isa_dev->irq;
goto ebus_done;
}
}
}
#endif
#ifdef CONFIG_SPARC64
/*
* Not on Ebus, bailing.
*/
return;
#else
/*
* Not on Ebus, must be OBIO.
*/
if (prom_getproperty(up->port_node, "reg",
(char *)&reg0, sizeof(reg0)) == -1) {
prom_printf("sunsu: no \"reg\" property\n");
return;
}
prom_apply_obio_ranges(&reg0, 1);
if (reg0.which_io != 0) { /* Just in case... */
prom_printf("sunsu: bus number nonzero: 0x%x:%x\n",
reg0.which_io, reg0.phys_addr);
return;
}
up->port.mapbase = reg0.phys_addr;
if ((up->port.membase = ioremap(reg0.phys_addr, reg0.reg_size)) == 0) {
prom_printf("sunsu: Cannot map registers.\n");
return;
}
/*
* 0x20 is sun4m thing, Dave Redman heritage.
* See arch/sparc/kernel/irq.c.
*/
#define IRQ_4M(n) ((n)|0x20)
/*
* There is no intr property on MrCoffee, so hardwire it.
*/
up->port.irq = IRQ_4M(13);
#endif
ebus_done:
spin_lock_irqsave(&up->port.lock, flags);
if (!(up->port.flags & ASYNC_BUGGY_UART)) {
/*
* Do a simple existence test first; if we fail this, there's
* no point trying anything else.
*
* 0x80 is used as a nonsense port to prevent against false
* positives due to ISA bus float. The assumption is that
* 0x80 is a non-existent port; which should be safe since
* include/asm/io.h also makes this assumption.
*/
scratch = serial_inp(up, UART_IER);
serial_outp(up, UART_IER, 0);
#ifdef __i386__
outb(0xff, 0x080);
#endif
scratch2 = serial_inp(up, UART_IER);
serial_outp(up, UART_IER, 0x0f);
#ifdef __i386__
outb(0, 0x080);
#endif
scratch3 = serial_inp(up, UART_IER);
serial_outp(up, UART_IER, scratch);
if (scratch2 != 0 || scratch3 != 0x0F)
goto out; /* We failed; there's nothing here */
}
save_mcr = serial_in(up, UART_MCR);
save_lcr = serial_in(up, UART_LCR);
/*
* Check to see if a UART is really there. Certain broken
* internal modems based on the Rockwell chipset fail this
* test, because they apparently don't implement the loopback
* test mode. So this test is skipped on the COM 1 through
* COM 4 ports. This *should* be safe, since no board
* manufacturer would be stupid enough to design a board
* that conflicts with COM 1-4 --- we hope!
*/
if (!(up->port.flags & ASYNC_SKIP_TEST)) {
serial_outp(up, UART_MCR, UART_MCR_LOOP | 0x0A);
status1 = serial_inp(up, UART_MSR) & 0xF0;
serial_outp(up, UART_MCR, save_mcr);
if (status1 != 0x90)
goto out; /* We failed loopback test */
}
serial_outp(up, UART_LCR, 0xBF); /* set up for StarTech test */
serial_outp(up, UART_EFR, 0); /* EFR is the same as FCR */
serial_outp(up, UART_LCR, 0);
serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
scratch = serial_in(up, UART_IIR) >> 6;
switch (scratch) {
case 0:
up->port.type = PORT_16450;
break;
case 1:
up->port.type = PORT_UNKNOWN;
break;
case 2:
up->port.type = PORT_16550;
break;
case 3:
up->port.type = PORT_16550A;
break;
}
if (up->port.type == PORT_16550A) {
/* Check for Startech UART's */
serial_outp(up, UART_LCR, UART_LCR_DLAB);
if (serial_in(up, UART_EFR) == 0) {
up->port.type = PORT_16650;
} else {
serial_outp(up, UART_LCR, 0xBF);
if (serial_in(up, UART_EFR) == 0)
up->port.type = PORT_16650V2;
}
}
if (up->port.type == PORT_16550A) {
/* Check for TI 16750 */
serial_outp(up, UART_LCR, save_lcr | UART_LCR_DLAB);
serial_outp(up, UART_FCR,
UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
scratch = serial_in(up, UART_IIR) >> 5;
if (scratch == 7) {
/*
* If this is a 16750, and not a cheap UART
* clone, then it should only go into 64 byte
* mode if the UART_FCR7_64BYTE bit was set
* while UART_LCR_DLAB was latched.
*/
serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
serial_outp(up, UART_LCR, 0);
serial_outp(up, UART_FCR,
UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
scratch = serial_in(up, UART_IIR) >> 5;
if (scratch == 6)
up->port.type = PORT_16750;
}
serial_outp(up, UART_FCR, UART_FCR_ENABLE_FIFO);
}
serial_outp(up, UART_LCR, save_lcr);
if (up->port.type == PORT_16450) {
scratch = serial_in(up, UART_SCR);
serial_outp(up, UART_SCR, 0xa5);
status1 = serial_in(up, UART_SCR);
serial_outp(up, UART_SCR, 0x5a);
status2 = serial_in(up, UART_SCR);
serial_outp(up, UART_SCR, scratch);
if ((status1 != 0xa5) || (status2 != 0x5a))
up->port.type = PORT_8250;
}
up->port.fifosize = uart_config[up->port.type].dfl_xmit_fifo_size;
if (up->port.type == PORT_UNKNOWN)
goto out;
up->type_probed = up->port.type; /* XXX */
/*
* Reset the UART.
*/
#ifdef CONFIG_SERIAL_8250_RSA
if (up->port.type == PORT_RSA)
serial_outp(up, UART_RSA_FRR, 0);
#endif
serial_outp(up, UART_MCR, save_mcr);
serial_outp(up, UART_FCR, (UART_FCR_ENABLE_FIFO |
UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT));
serial_outp(up, UART_FCR, 0);
(void)serial_in(up, UART_RX);
serial_outp(up, UART_IER, 0);
out:
spin_unlock_irqrestore(&up->port.lock, flags);
}
static struct uart_driver sunsu_reg = {
.owner = THIS_MODULE,
.driver_name = "serial",
.devfs_name = "tts/",
.dev_name = "ttyS",
.major = TTY_MAJOR,
};
static int __init sunsu_kbd_ms_init(struct uart_sunsu_port *up, int channel)
{
int quot, baud;
#ifdef CONFIG_SERIO
struct serio *serio;
#endif
up->port.line = channel;
up->port.type = PORT_UNKNOWN;
up->port.uartclk = (SU_BASE_BAUD * 16);
if (up->su_type == SU_PORT_KBD) {
up->cflag = B1200 | CS8 | CLOCAL | CREAD;
baud = 1200;
} else {
up->cflag = B4800 | CS8 | CLOCAL | CREAD;
baud = 4800;
}
quot = up->port.uartclk / (16 * baud);
sunsu_autoconfig(up);
if (up->port.type == PORT_UNKNOWN)
return -1;
printk(KERN_INFO "su%d at 0x%p (irq = %s) is a %s\n",
channel,
up->port.membase, __irq_itoa(up->port.irq),
sunsu_type(&up->port));
#ifdef CONFIG_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 (up->su_type == SU_PORT_KBD) {
serio->id.proto = SERIO_SUNKBD;
strlcpy(serio->name, "sukbd", sizeof(serio->name));
} else {
serio->id.proto = SERIO_SUN;
serio->id.extra = 1;
strlcpy(serio->name, "sums", sizeof(serio->name));
}
strlcpy(serio->phys, (channel == 0 ? "su/serio0" : "su/serio1"),
sizeof(serio->phys));
serio->write = sunsu_serio_write;
serio->open = sunsu_serio_open;
serio->close = sunsu_serio_close;
serio_register_port(serio);
} else {
printk(KERN_WARNING "su%d: not enough memory for serio port\n",
channel);
}
#endif
sunsu_change_speed(&up->port, up->cflag, 0, quot);
sunsu_startup(&up->port);
return 0;
}
/*
* ------------------------------------------------------------
* Serial console driver
* ------------------------------------------------------------
*/
#ifdef CONFIG_SERIAL_SUNSU_CONSOLE
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
/*
* Wait for transmitter & holding register to empty
*/
static __inline__ void wait_for_xmitr(struct uart_sunsu_port *up)
{
unsigned int status, tmout = 10000;
/* Wait up to 10ms for the character(s) to be sent. */
do {
status = serial_in(up, UART_LSR);
if (status & UART_LSR_BI)
up->lsr_break_flag = UART_LSR_BI;
if (--tmout == 0)
break;
udelay(1);
} while ((status & BOTH_EMPTY) != BOTH_EMPTY);
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & ASYNC_CONS_FLOW) {
tmout = 1000000;
while (--tmout &&
((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
udelay(1);
}
}
/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*/
static void sunsu_console_write(struct console *co, const char *s,
unsigned int count)
{
struct uart_sunsu_port *up = &sunsu_ports[co->index];
unsigned int ier;
int i;
/*
* First save the UER then disable the interrupts
*/
ier = serial_in(up, UART_IER);
serial_out(up, UART_IER, 0);
/*
* Now, do each character
*/
for (i = 0; i < count; i++, s++) {
wait_for_xmitr(up);
/*
* Send the character out.
* If a LF, also do CR...
*/
serial_out(up, UART_TX, *s);
if (*s == 10) {
wait_for_xmitr(up);
serial_out(up, UART_TX, 13);
}
}
/*
* Finally, wait for transmitter to become empty
* and restore the IER
*/
wait_for_xmitr(up);
serial_out(up, UART_IER, ier);
}
/*
* Setup initial baud/bits/parity. We do two things here:
* - construct a cflag setting for the first su_open()
* - initialize the serial port
* Return non-zero if we didn't find a serial port.
*/
static int sunsu_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
printk("Console: ttyS%d (SU)\n",
(sunsu_reg.minor - 64) + co->index);
/*
* Check whether an invalid uart number has been specified, and
* if so, search for the first available port that does have
* console support.
*/
if (co->index >= UART_NR)
co->index = 0;
port = &sunsu_ports[co->index].port;
/*
* Temporary fix.
*/
spin_lock_init(&port->lock);
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(port, co, baud, parity, bits, flow);
}
static struct console sunsu_cons = {
.name = "ttyS",
.write = sunsu_console_write,
.device = uart_console_device,
.setup = sunsu_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &sunsu_reg,
};
#define SUNSU_CONSOLE (&sunsu_cons)
/*
* Register console.
*/
static int __init sunsu_serial_console_init(void)
{
int i;
if (con_is_present())
return 0;
for (i = 0; i < UART_NR; i++) {
int this_minor = sunsu_reg.minor + i;
if ((this_minor - 64) == (serial_console - 1))
break;
}
if (i == UART_NR)
return 0;
if (sunsu_ports[i].port_node == 0)
return 0;
sunsu_cons.index = i;
register_console(&sunsu_cons);
return 0;
}
#else
#define SUNSU_CONSOLE (NULL)
#define sunsu_serial_console_init() do { } while (0)
#endif
static int __init sunsu_serial_init(void)
{
int instance, ret, i;
/* How many instances do we need? */
instance = 0;
for (i = 0; i < UART_NR; i++) {
struct uart_sunsu_port *up = &sunsu_ports[i];
if (up->su_type == SU_PORT_MS ||
up->su_type == SU_PORT_KBD)
continue;
up->port.flags |= ASYNC_BOOT_AUTOCONF;
up->port.type = PORT_UNKNOWN;
up->port.uartclk = (SU_BASE_BAUD * 16);
sunsu_autoconfig(up);
if (up->port.type == PORT_UNKNOWN)
continue;
up->port.line = instance++;
up->port.ops = &sunsu_pops;
}
sunsu_reg.minor = sunserial_current_minor;
sunserial_current_minor += instance;
sunsu_reg.nr = instance;
sunsu_reg.cons = SUNSU_CONSOLE;
ret = uart_register_driver(&sunsu_reg);
if (ret < 0)
return ret;
sunsu_serial_console_init();
for (i = 0; i < UART_NR; i++) {
struct uart_sunsu_port *up = &sunsu_ports[i];
/* Do not register Keyboard/Mouse lines with UART
* layer.
*/
if (up->su_type == SU_PORT_MS ||
up->su_type == SU_PORT_KBD)
continue;
if (up->port.type == PORT_UNKNOWN)
continue;
uart_add_one_port(&sunsu_reg, &up->port);
}
return 0;
}
static int su_node_ok(int node, char *name, int namelen)
{
if (strncmp(name, "su", namelen) == 0 ||
strncmp(name, "su_pnp", namelen) == 0)
return 1;
if (strncmp(name, "serial", namelen) == 0) {
char compat[32];
int clen;
/* Is it _really_ a 'su' device? */
clen = prom_getproperty(node, "compatible", compat, sizeof(compat));
if (clen > 0) {
if (strncmp(compat, "sab82532", 8) == 0) {
/* Nope, Siemens serial, not for us. */
return 0;
}
}
return 1;
}
return 0;
}
#define SU_PROPSIZE 128
/*
* Scan status structure.
* "prop" is a local variable but it eats stack to keep it in each
* stack frame of a recursive procedure.
*/
struct su_probe_scan {
int msnode, kbnode; /* PROM nodes for mouse and keyboard */
int msx, kbx; /* minors for mouse and keyboard */
int devices; /* scan index */
char prop[SU_PROPSIZE];
};
/*
* We have several platforms which present 'su' in different parts
* of the device tree. 'su' may be found under obio, ebus, isa and pci.
* We walk over the tree and find them wherever PROM hides them.
*/
static void __init su_probe_any(struct su_probe_scan *t, int sunode)
{
struct uart_sunsu_port *up;
int len;
if (t->devices >= UART_NR)
return;
for (; sunode != 0; sunode = prom_getsibling(sunode)) {
len = prom_getproperty(sunode, "name", t->prop, SU_PROPSIZE);
if (len <= 1)
continue; /* Broken PROM node */
if (su_node_ok(sunode, t->prop, len)) {
up = &sunsu_ports[t->devices];
if (t->kbnode != 0 && sunode == t->kbnode) {
t->kbx = t->devices;
up->su_type = SU_PORT_KBD;
} else if (t->msnode != 0 && sunode == t->msnode) {
t->msx = t->devices;
up->su_type = SU_PORT_MS;
} else {
#ifdef CONFIG_SPARC64
/*
* Do not attempt to use the truncated
* keyboard/mouse ports as serial ports
* on Ultras with PC keyboard attached.
*/
if (prom_getbool(sunode, "mouse"))
continue;
if (prom_getbool(sunode, "keyboard"))
continue;
#endif
up->su_type = SU_PORT_PORT;
}
up->port_node = sunode;
++t->devices;
} else {
su_probe_any(t, prom_getchild(sunode));
}
}
}
static int __init sunsu_probe(void)
{
int node;
int len;
struct su_probe_scan scan;
/*
* First, we scan the tree.
*/
scan.devices = 0;
scan.msx = -1;
scan.kbx = -1;
scan.kbnode = 0;
scan.msnode = 0;
/*
* Get the nodes for keyboard and mouse from 'aliases'...
*/
node = prom_getchild(prom_root_node);
node = prom_searchsiblings(node, "aliases");
if (node != 0) {
len = prom_getproperty(node, "keyboard", scan.prop, SU_PROPSIZE);
if (len > 0) {
scan.prop[len] = 0;
scan.kbnode = prom_finddevice(scan.prop);
}
len = prom_getproperty(node, "mouse", scan.prop, SU_PROPSIZE);
if (len > 0) {
scan.prop[len] = 0;
scan.msnode = prom_finddevice(scan.prop);
}
}
su_probe_any(&scan, prom_getchild(prom_root_node));
/*
* Second, we process the special case of keyboard and mouse.
*
* Currently if we got keyboard and mouse hooked to "su" ports
* we do not use any possible remaining "su" as a serial port.
* Thus, we ignore values of .msx and .kbx, then compact ports.
*/
if (scan.msx != -1 && scan.kbx != -1) {
sunsu_ports[0].su_type = SU_PORT_MS;
sunsu_ports[0].port_node = scan.msnode;
sunsu_kbd_ms_init(&sunsu_ports[0], 0);
sunsu_ports[1].su_type = SU_PORT_KBD;
sunsu_ports[1].port_node = scan.kbnode;
sunsu_kbd_ms_init(&sunsu_ports[1], 1);
return 0;
}
if (scan.msx != -1 || scan.kbx != -1) {
printk("sunsu_probe: cannot match keyboard and mouse, confused\n");
return -ENODEV;
}
if (scan.devices == 0)
return -ENODEV;
/*
* Console must be initiated after the generic initialization.
*/
sunsu_serial_init();
return 0;
}
static void __exit sunsu_exit(void)
{
int i, saw_uart;
saw_uart = 0;
for (i = 0; i < UART_NR; i++) {
struct uart_sunsu_port *up = &sunsu_ports[i];
if (up->su_type == SU_PORT_MS ||
up->su_type == SU_PORT_KBD) {
#ifdef CONFIG_SERIO
if (up->serio) {
serio_unregister_port(up->serio);
up->serio = NULL;
}
#endif
} else if (up->port.type != PORT_UNKNOWN) {
uart_remove_one_port(&sunsu_reg, &up->port);
saw_uart++;
}
}
if (saw_uart)
uart_unregister_driver(&sunsu_reg);
}
module_init(sunsu_probe);
module_exit(sunsu_exit);
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