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linux/drivers/serial/amba-pl010.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

822 lines
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/*
* linux/drivers/char/amba.c
*
* Driver for AMBA serial ports
*
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
*
* Copyright 1999 ARM Limited
* Copyright (C) 2000 Deep Blue Solutions Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: amba.c,v 1.41 2002/07/28 10:03:27 rmk Exp $
*
* This is a generic driver for ARM AMBA-type serial ports. They
* have a lot of 16550-like features, but are not register compatible.
* Note that although they do have CTS, DCD and DSR inputs, they do
* not have an RI input, nor do they have DTR or RTS outputs. If
* required, these have to be supplied via some other means (eg, GPIO)
* and hooked into this driver.
*/
#include <linux/config.h>
#if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/amba/bus.h>
#include <linux/amba/serial.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/hardware.h>
#define UART_NR 2
#define SERIAL_AMBA_MAJOR 204
#define SERIAL_AMBA_MINOR 16
#define SERIAL_AMBA_NR UART_NR
#define AMBA_ISR_PASS_LIMIT 256
/*
* Access macros for the AMBA UARTs
*/
#define UART_GET_INT_STATUS(p) readb((p)->membase + UART010_IIR)
#define UART_PUT_ICR(p, c) writel((c), (p)->membase + UART010_ICR)
#define UART_GET_FR(p) readb((p)->membase + UART01x_FR)
#define UART_GET_CHAR(p) readb((p)->membase + UART01x_DR)
#define UART_PUT_CHAR(p, c) writel((c), (p)->membase + UART01x_DR)
#define UART_GET_RSR(p) readb((p)->membase + UART01x_RSR)
#define UART_GET_CR(p) readb((p)->membase + UART010_CR)
#define UART_PUT_CR(p,c) writel((c), (p)->membase + UART010_CR)
#define UART_GET_LCRL(p) readb((p)->membase + UART010_LCRL)
#define UART_PUT_LCRL(p,c) writel((c), (p)->membase + UART010_LCRL)
#define UART_GET_LCRM(p) readb((p)->membase + UART010_LCRM)
#define UART_PUT_LCRM(p,c) writel((c), (p)->membase + UART010_LCRM)
#define UART_GET_LCRH(p) readb((p)->membase + UART010_LCRH)
#define UART_PUT_LCRH(p,c) writel((c), (p)->membase + UART010_LCRH)
#define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0)
#define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0)
#define UART_TX_EMPTY(p) ((UART_GET_FR(p) & UART01x_FR_TMSK) == 0)
#define UART_DUMMY_RSR_RX /*256*/0
#define UART_PORT_SIZE 64
/*
* On the Integrator platform, the port RTS and DTR are provided by
* bits in the following SC_CTRLS register bits:
* RTS DTR
* UART0 7 6
* UART1 5 4
*/
#define SC_CTRLC (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLC_OFFSET)
#define SC_CTRLS (IO_ADDRESS(INTEGRATOR_SC_BASE) + INTEGRATOR_SC_CTRLS_OFFSET)
/*
* We wrap our port structure around the generic uart_port.
*/
struct uart_amba_port {
struct uart_port port;
unsigned int dtr_mask;
unsigned int rts_mask;
unsigned int old_status;
};
static void pl010_stop_tx(struct uart_port *port)
{
unsigned int cr;
cr = UART_GET_CR(port);
cr &= ~UART010_CR_TIE;
UART_PUT_CR(port, cr);
}
static void pl010_start_tx(struct uart_port *port)
{
unsigned int cr;
cr = UART_GET_CR(port);
cr |= UART010_CR_TIE;
UART_PUT_CR(port, cr);
}
static void pl010_stop_rx(struct uart_port *port)
{
unsigned int cr;
cr = UART_GET_CR(port);
cr &= ~(UART010_CR_RIE | UART010_CR_RTIE);
UART_PUT_CR(port, cr);
}
static void pl010_enable_ms(struct uart_port *port)
{
unsigned int cr;
cr = UART_GET_CR(port);
cr |= UART010_CR_MSIE;
UART_PUT_CR(port, cr);
}
static void
#ifdef SUPPORT_SYSRQ
pl010_rx_chars(struct uart_port *port, struct pt_regs *regs)
#else
pl010_rx_chars(struct uart_port *port)
#endif
{
struct tty_struct *tty = port->info->tty;
unsigned int status, ch, flag, rsr, max_count = 256;
status = UART_GET_FR(port);
while (UART_RX_DATA(status) && max_count--) {
ch = UART_GET_CHAR(port);
flag = TTY_NORMAL;
port->icount.rx++;
/*
* Note that the error handling code is
* out of the main execution path
*/
rsr = UART_GET_RSR(port) | UART_DUMMY_RSR_RX;
if (unlikely(rsr & UART01x_RSR_ANY)) {
if (rsr & UART01x_RSR_BE) {
rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
port->icount.brk++;
if (uart_handle_break(port))
goto ignore_char;
} else if (rsr & UART01x_RSR_PE)
port->icount.parity++;
else if (rsr & UART01x_RSR_FE)
port->icount.frame++;
if (rsr & UART01x_RSR_OE)
port->icount.overrun++;
rsr &= port->read_status_mask;
if (rsr & UART01x_RSR_BE)
flag = TTY_BREAK;
else if (rsr & UART01x_RSR_PE)
flag = TTY_PARITY;
else if (rsr & UART01x_RSR_FE)
flag = TTY_FRAME;
}
if (uart_handle_sysrq_char(port, ch, regs))
goto ignore_char;
uart_insert_char(port, rsr, UART01x_RSR_OE, ch, flag);
ignore_char:
status = UART_GET_FR(port);
}
tty_flip_buffer_push(tty);
return;
}
static void pl010_tx_chars(struct uart_port *port)
{
struct circ_buf *xmit = &port->info->xmit;
int count;
if (port->x_char) {
UART_PUT_CHAR(port, port->x_char);
port->icount.tx++;
port->x_char = 0;
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
pl010_stop_tx(port);
return;
}
count = port->fifosize >> 1;
do {
UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
if (uart_circ_empty(xmit))
break;
} while (--count > 0);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
pl010_stop_tx(port);
}
static void pl010_modem_status(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int status, delta;
UART_PUT_ICR(&uap->port, 0);
status = UART_GET_FR(&uap->port) & UART01x_FR_MODEM_ANY;
delta = status ^ uap->old_status;
uap->old_status = status;
if (!delta)
return;
if (delta & UART01x_FR_DCD)
uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
if (delta & UART01x_FR_DSR)
uap->port.icount.dsr++;
if (delta & UART01x_FR_CTS)
uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
wake_up_interruptible(&uap->port.info->delta_msr_wait);
}
static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs)
{
struct uart_port *port = dev_id;
unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
int handled = 0;
spin_lock(&port->lock);
status = UART_GET_INT_STATUS(port);
if (status) {
do {
if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
#ifdef SUPPORT_SYSRQ
pl010_rx_chars(port, regs);
#else
pl010_rx_chars(port);
#endif
if (status & UART010_IIR_MIS)
pl010_modem_status(port);
if (status & UART010_IIR_TIS)
pl010_tx_chars(port);
if (pass_counter-- == 0)
break;
status = UART_GET_INT_STATUS(port);
} while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
UART010_IIR_TIS));
handled = 1;
}
spin_unlock(&port->lock);
return IRQ_RETVAL(handled);
}
static unsigned int pl010_tx_empty(struct uart_port *port)
{
return UART_GET_FR(port) & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
}
static unsigned int pl010_get_mctrl(struct uart_port *port)
{
unsigned int result = 0;
unsigned int status;
status = UART_GET_FR(port);
if (status & UART01x_FR_DCD)
result |= TIOCM_CAR;
if (status & UART01x_FR_DSR)
result |= TIOCM_DSR;
if (status & UART01x_FR_CTS)
result |= TIOCM_CTS;
return result;
}
static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int ctrls = 0, ctrlc = 0;
if (mctrl & TIOCM_RTS)
ctrlc |= uap->rts_mask;
else
ctrls |= uap->rts_mask;
if (mctrl & TIOCM_DTR)
ctrlc |= uap->dtr_mask;
else
ctrls |= uap->dtr_mask;
__raw_writel(ctrls, SC_CTRLS);
__raw_writel(ctrlc, SC_CTRLC);
}
static void pl010_break_ctl(struct uart_port *port, int break_state)
{
unsigned long flags;
unsigned int lcr_h;
spin_lock_irqsave(&port->lock, flags);
lcr_h = UART_GET_LCRH(port);
if (break_state == -1)
lcr_h |= UART01x_LCRH_BRK;
else
lcr_h &= ~UART01x_LCRH_BRK;
UART_PUT_LCRH(port, lcr_h);
spin_unlock_irqrestore(&port->lock, flags);
}
static int pl010_startup(struct uart_port *port)
{
struct uart_amba_port *uap = (struct uart_amba_port *)port;
int retval;
/*
* Allocate the IRQ
*/
retval = request_irq(port->irq, pl010_int, 0, "uart-pl010", port);
if (retval)
return retval;
/*
* initialise the old status of the modem signals
*/
uap->old_status = UART_GET_FR(port) & UART01x_FR_MODEM_ANY;
/*
* Finally, enable interrupts
*/
UART_PUT_CR(port, UART01x_CR_UARTEN | UART010_CR_RIE |
UART010_CR_RTIE);
return 0;
}
static void pl010_shutdown(struct uart_port *port)
{
/*
* Free the interrupt
*/
free_irq(port->irq, port);
/*
* disable all interrupts, disable the port
*/
UART_PUT_CR(port, 0);
/* disable break condition and fifos */
UART_PUT_LCRH(port, UART_GET_LCRH(port) &
~(UART01x_LCRH_BRK | UART01x_LCRH_FEN));
}
static void
pl010_set_termios(struct uart_port *port, struct termios *termios,
struct termios *old)
{
unsigned int lcr_h, old_cr;
unsigned long flags;
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);
switch (termios->c_cflag & CSIZE) {
case CS5:
lcr_h = UART01x_LCRH_WLEN_5;
break;
case CS6:
lcr_h = UART01x_LCRH_WLEN_6;
break;
case CS7:
lcr_h = UART01x_LCRH_WLEN_7;
break;
default: // CS8
lcr_h = UART01x_LCRH_WLEN_8;
break;
}
if (termios->c_cflag & CSTOPB)
lcr_h |= UART01x_LCRH_STP2;
if (termios->c_cflag & PARENB) {
lcr_h |= UART01x_LCRH_PEN;
if (!(termios->c_cflag & PARODD))
lcr_h |= UART01x_LCRH_EPS;
}
if (port->fifosize > 1)
lcr_h |= UART01x_LCRH_FEN;
spin_lock_irqsave(&port->lock, flags);
/*
* Update the per-port timeout.
*/
uart_update_timeout(port, termios->c_cflag, baud);
port->read_status_mask = UART01x_RSR_OE;
if (termios->c_iflag & INPCK)
port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
if (termios->c_iflag & (BRKINT | PARMRK))
port->read_status_mask |= UART01x_RSR_BE;
/*
* Characters to ignore
*/
port->ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
if (termios->c_iflag & IGNBRK) {
port->ignore_status_mask |= UART01x_RSR_BE;
/*
* If we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
if (termios->c_iflag & IGNPAR)
port->ignore_status_mask |= UART01x_RSR_OE;
}
/*
* Ignore all characters if CREAD is not set.
*/
if ((termios->c_cflag & CREAD) == 0)
port->ignore_status_mask |= UART_DUMMY_RSR_RX;
/* first, disable everything */
old_cr = UART_GET_CR(port) & ~UART010_CR_MSIE;
if (UART_ENABLE_MS(port, termios->c_cflag))
old_cr |= UART010_CR_MSIE;
UART_PUT_CR(port, 0);
/* Set baud rate */
quot -= 1;
UART_PUT_LCRM(port, ((quot & 0xf00) >> 8));
UART_PUT_LCRL(port, (quot & 0xff));
/*
* ----------v----------v----------v----------v-----
* NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
* ----------^----------^----------^----------^-----
*/
UART_PUT_LCRH(port, lcr_h);
UART_PUT_CR(port, old_cr);
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *pl010_type(struct uart_port *port)
{
return port->type == PORT_AMBA ? "AMBA" : NULL;
}
/*
* Release the memory region(s) being used by 'port'
*/
static void pl010_release_port(struct uart_port *port)
{
release_mem_region(port->mapbase, UART_PORT_SIZE);
}
/*
* Request the memory region(s) being used by 'port'
*/
static int pl010_request_port(struct uart_port *port)
{
return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
!= NULL ? 0 : -EBUSY;
}
/*
* Configure/autoconfigure the port.
*/
static void pl010_config_port(struct uart_port *port, int flags)
{
if (flags & UART_CONFIG_TYPE) {
port->type = PORT_AMBA;
pl010_request_port(port);
}
}
/*
* verify the new serial_struct (for TIOCSSERIAL).
*/
static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
{
int ret = 0;
if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
ret = -EINVAL;
if (ser->irq < 0 || ser->irq >= NR_IRQS)
ret = -EINVAL;
if (ser->baud_base < 9600)
ret = -EINVAL;
return ret;
}
static struct uart_ops amba_pl010_pops = {
.tx_empty = pl010_tx_empty,
.set_mctrl = pl010_set_mctrl,
.get_mctrl = pl010_get_mctrl,
.stop_tx = pl010_stop_tx,
.start_tx = pl010_start_tx,
.stop_rx = pl010_stop_rx,
.enable_ms = pl010_enable_ms,
.break_ctl = pl010_break_ctl,
.startup = pl010_startup,
.shutdown = pl010_shutdown,
.set_termios = pl010_set_termios,
.type = pl010_type,
.release_port = pl010_release_port,
.request_port = pl010_request_port,
.config_port = pl010_config_port,
.verify_port = pl010_verify_port,
};
static struct uart_amba_port amba_ports[UART_NR] = {
{
.port = {
.membase = (void *)IO_ADDRESS(INTEGRATOR_UART0_BASE),
.mapbase = INTEGRATOR_UART0_BASE,
.iotype = SERIAL_IO_MEM,
.irq = IRQ_UARTINT0,
.uartclk = 14745600,
.fifosize = 16,
.ops = &amba_pl010_pops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 0,
},
.dtr_mask = 1 << 5,
.rts_mask = 1 << 4,
},
{
.port = {
.membase = (void *)IO_ADDRESS(INTEGRATOR_UART1_BASE),
.mapbase = INTEGRATOR_UART1_BASE,
.iotype = SERIAL_IO_MEM,
.irq = IRQ_UARTINT1,
.uartclk = 14745600,
.fifosize = 16,
.ops = &amba_pl010_pops,
.flags = ASYNC_BOOT_AUTOCONF,
.line = 1,
},
.dtr_mask = 1 << 7,
.rts_mask = 1 << 6,
}
};
#ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
static void
pl010_console_write(struct console *co, const char *s, unsigned int count)
{
struct uart_port *port = &amba_ports[co->index].port;
unsigned int status, old_cr;
int i;
/*
* First save the CR then disable the interrupts
*/
old_cr = UART_GET_CR(port);
UART_PUT_CR(port, UART01x_CR_UARTEN);
/*
* Now, do each character
*/
for (i = 0; i < count; i++) {
do {
status = UART_GET_FR(port);
} while (!UART_TX_READY(status));
UART_PUT_CHAR(port, s[i]);
if (s[i] == '\n') {
do {
status = UART_GET_FR(port);
} while (!UART_TX_READY(status));
UART_PUT_CHAR(port, '\r');
}
}
/*
* Finally, wait for transmitter to become empty
* and restore the TCR
*/
do {
status = UART_GET_FR(port);
} while (status & UART01x_FR_BUSY);
UART_PUT_CR(port, old_cr);
}
static void __init
pl010_console_get_options(struct uart_port *port, int *baud,
int *parity, int *bits)
{
if (UART_GET_CR(port) & UART01x_CR_UARTEN) {
unsigned int lcr_h, quot;
lcr_h = UART_GET_LCRH(port);
*parity = 'n';
if (lcr_h & UART01x_LCRH_PEN) {
if (lcr_h & UART01x_LCRH_EPS)
*parity = 'e';
else
*parity = 'o';
}
if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
*bits = 7;
else
*bits = 8;
quot = UART_GET_LCRL(port) | UART_GET_LCRM(port) << 8;
*baud = port->uartclk / (16 * (quot + 1));
}
}
static int __init pl010_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 38400;
int bits = 8;
int parity = 'n';
int flow = 'n';
/*
* 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 = &amba_ports[co->index].port;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
else
pl010_console_get_options(port, &baud, &parity, &bits);
return uart_set_options(port, co, baud, parity, bits, flow);
}
static struct uart_driver amba_reg;
static struct console amba_console = {
.name = "ttyAM",
.write = pl010_console_write,
.device = uart_console_device,
.setup = pl010_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &amba_reg,
};
static int __init amba_console_init(void)
{
/*
* All port initializations are done statically
*/
register_console(&amba_console);
return 0;
}
console_initcall(amba_console_init);
static int __init amba_late_console_init(void)
{
if (!(amba_console.flags & CON_ENABLED))
register_console(&amba_console);
return 0;
}
late_initcall(amba_late_console_init);
#define AMBA_CONSOLE &amba_console
#else
#define AMBA_CONSOLE NULL
#endif
static struct uart_driver amba_reg = {
.owner = THIS_MODULE,
.driver_name = "ttyAM",
.dev_name = "ttyAM",
.major = SERIAL_AMBA_MAJOR,
.minor = SERIAL_AMBA_MINOR,
.nr = UART_NR,
.cons = AMBA_CONSOLE,
};
static int pl010_probe(struct amba_device *dev, void *id)
{
int i;
for (i = 0; i < UART_NR; i++) {
if (amba_ports[i].port.mapbase != dev->res.start)
continue;
amba_ports[i].port.dev = &dev->dev;
uart_add_one_port(&amba_reg, &amba_ports[i].port);
amba_set_drvdata(dev, &amba_ports[i]);
break;
}
return 0;
}
static int pl010_remove(struct amba_device *dev)
{
struct uart_amba_port *uap = amba_get_drvdata(dev);
if (uap)
uart_remove_one_port(&amba_reg, &uap->port);
amba_set_drvdata(dev, NULL);
return 0;
}
static int pl010_suspend(struct amba_device *dev, pm_message_t state)
{
struct uart_amba_port *uap = amba_get_drvdata(dev);
if (uap)
uart_suspend_port(&amba_reg, &uap->port);
return 0;
}
static int pl010_resume(struct amba_device *dev)
{
struct uart_amba_port *uap = amba_get_drvdata(dev);
if (uap)
uart_resume_port(&amba_reg, &uap->port);
return 0;
}
static struct amba_id pl010_ids[] __initdata = {
{
.id = 0x00041010,
.mask = 0x000fffff,
},
{ 0, 0 },
};
static struct amba_driver pl010_driver = {
.drv = {
.name = "uart-pl010",
},
.id_table = pl010_ids,
.probe = pl010_probe,
.remove = pl010_remove,
.suspend = pl010_suspend,
.resume = pl010_resume,
};
static int __init pl010_init(void)
{
int ret;
printk(KERN_INFO "Serial: AMBA driver $Revision: 1.41 $\n");
ret = uart_register_driver(&amba_reg);
if (ret == 0) {
ret = amba_driver_register(&pl010_driver);
if (ret)
uart_unregister_driver(&amba_reg);
}
return ret;
}
static void __exit pl010_exit(void)
{
amba_driver_unregister(&pl010_driver);
uart_unregister_driver(&amba_reg);
}
module_init(pl010_init);
module_exit(pl010_exit);
MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
MODULE_DESCRIPTION("ARM AMBA serial port driver $Revision: 1.41 $");
MODULE_LICENSE("GPL");
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