- 根目录:
- drivers
- tty
- serial
- pnx8xxx_uart.c
/*
* UART driver for PNX8XXX SoCs
*
* Author: Per Hallsmark per.hallsmark@mvista.com
* Ported to 2.6 kernel by EmbeddedAlley
* Reworked by Vitaly Wool <vitalywool@gmail.com>
*
* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
* Copyright (C) 2000 Deep Blue Solutions Ltd.
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of
* any kind, whether express or implied.
*
*/
#if defined(CONFIG_SERIAL_PNX8XXX_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/platform_device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/serial.h>
#include <linux/serial_pnx8xxx.h>
#include <asm/io.h>
#include <asm/irq.h>
/* We'll be using StrongARM sa1100 serial port major/minor */
#define SERIAL_PNX8XXX_MAJOR 204
#define MINOR_START 5
#define NR_PORTS 2
#define PNX8XXX_ISR_PASS_LIMIT 256
/*
* Convert from ignore_status_mask or read_status_mask to FIFO
* and interrupt status bits
*/
#define SM_TO_FIFO(x) ((x) >> 10)
#define SM_TO_ISTAT(x) ((x) & 0x000001ff)
#define FIFO_TO_SM(x) ((x) << 10)
#define ISTAT_TO_SM(x) ((x) & 0x000001ff)
/*
* This is the size of our serial port register set.
*/
#define UART_PORT_SIZE 0x1000
/*
* This determines how often we check the modem status signals
* for any change. They generally aren't connected to an IRQ
* so we have to poll them. We also check immediately before
* filling the TX fifo incase CTS has been dropped.
*/
#define MCTRL_TIMEOUT (250*HZ/1000)
extern struct pnx8xxx_port pnx8xxx_ports[];
static inline int serial_in(struct pnx8xxx_port *sport, int offset)
{
return (__raw_readl(sport->port.membase + offset));
}
static inline void serial_out(struct pnx8xxx_port *sport, int offset, int value)
{
__raw_writel(value, sport->port.membase + offset);
}
/*
* Handle any change of modem status signal since we were last called.
*/
static void pnx8xxx_mctrl_check(struct pnx8xxx_port *sport)
{
unsigned int status, changed;
status = sport->port.ops->get_mctrl(&sport->port);
changed = status ^ sport->old_status;
if (changed == 0)
return;
sport->old_status = status;
if (changed & TIOCM_RI)
sport->port.icount.rng++;
if (changed & TIOCM_DSR)
sport->port.icount.dsr++;
if (changed & TIOCM_CAR)
uart_handle_dcd_change(&sport->port, status & TIOCM_CAR);
if (changed & TIOCM_CTS)
uart_handle_cts_change(&sport->port, status & TIOCM_CTS);
wake_up_interruptible(&sport->port.state->port.delta_msr_wait);
}
/*
* This is our per-port timeout handler, for checking the
* modem status signals.
*/
static void pnx8xxx_timeout(unsigned long data)
{
struct pnx8xxx_port *sport = (struct pnx8xxx_port *)data;
unsigned long flags;
if (sport->port.state) {
spin_lock_irqsave(&sport->port.lock, flags);
pnx8xxx_mctrl_check(sport);
spin_unlock_irqrestore(&sport->port.lock, flags);
mod_timer(&sport->timer, jiffies + MCTRL_TIMEOUT);
}
}
/*
* interrupts disabled on entry
*/
static void pnx8xxx_stop_tx(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
u32 ien;
/* Disable TX intr */
ien = serial_in(sport, PNX8XXX_IEN);
serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLTX);
/* Clear all pending TX intr */
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX);
}
/*
* interrupts may not be disabled on entry
*/
static void pnx8xxx_start_tx(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
u32 ien;
/* Clear all pending TX intr */
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLTX);
/* Enable TX intr */
ien = serial_in(sport, PNX8XXX_IEN);
serial_out(sport, PNX8XXX_IEN, ien | PNX8XXX_UART_INT_ALLTX);
}
/*
* Interrupts enabled
*/
static void pnx8xxx_stop_rx(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
u32 ien;
/* Disable RX intr */
ien = serial_in(sport, PNX8XXX_IEN);
serial_out(sport, PNX8XXX_IEN, ien & ~PNX8XXX_UART_INT_ALLRX);
/* Clear all pending RX intr */
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX);
}
/*
* Set the modem control timer to fire immediately.
*/
static void pnx8xxx_enable_ms(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
mod_timer(&sport->timer, jiffies);
}
static void pnx8xxx_rx_chars(struct pnx8xxx_port *sport)
{
unsigned int status, ch, flg;
status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
while (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFIFO)) {
ch = serial_in(sport, PNX8XXX_FIFO) & 0xff;
sport->port.icount.rx++;
flg = TTY_NORMAL;
/*
* note that the error handling code is
* out of the main execution path
*/
if (status & (FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE |
PNX8XXX_UART_FIFO_RXPAR |
PNX8XXX_UART_FIFO_RXBRK) |
ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))) {
if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXBRK)) {
status &= ~(FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR));
sport->port.icount.brk++;
if (uart_handle_break(&sport->port))
goto ignore_char;
} else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR))
sport->port.icount.parity++;
else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE))
sport->port.icount.frame++;
if (status & ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN))
sport->port.icount.overrun++;
status &= sport->port.read_status_mask;
if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR))
flg = TTY_PARITY;
else if (status & FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE))
flg = TTY_FRAME;
#ifdef SUPPORT_SYSRQ
sport->port.sysrq = 0;
#endif
}
if (uart_handle_sysrq_char(&sport->port, ch))
goto ignore_char;
uart_insert_char(&sport->port, status,
ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN), ch, flg);
ignore_char:
serial_out(sport, PNX8XXX_LCR, serial_in(sport, PNX8XXX_LCR) |
PNX8XXX_UART_LCR_RX_NEXT);
status = FIFO_TO_SM(serial_in(sport, PNX8XXX_FIFO)) |
ISTAT_TO_SM(serial_in(sport, PNX8XXX_ISTAT));
}
spin_unlock(&sport->port.lock);
tty_flip_buffer_push(&sport->port.state->port);
spin_lock(&sport->port.lock);
}
static void pnx8xxx_tx_chars(struct pnx8xxx_port *sport)
{
struct circ_buf *xmit = &sport->port.state->xmit;
if (sport->port.x_char) {
serial_out(sport, PNX8XXX_FIFO, sport->port.x_char);
sport->port.icount.tx++;
sport->port.x_char = 0;
return;
}
/*
* Check the modem control lines before
* transmitting anything.
*/
pnx8xxx_mctrl_check(sport);
if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) {
pnx8xxx_stop_tx(&sport->port);
return;
}
/*
* TX while bytes available
*/
while (((serial_in(sport, PNX8XXX_FIFO) &
PNX8XXX_UART_FIFO_TXFIFO) >> 16) < 16) {
serial_out(sport, PNX8XXX_FIFO, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
sport->port.icount.tx++;
if (uart_circ_empty(xmit))
break;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(&sport->port);
if (uart_circ_empty(xmit))
pnx8xxx_stop_tx(&sport->port);
}
static irqreturn_t pnx8xxx_int(int irq, void *dev_id)
{
struct pnx8xxx_port *sport = dev_id;
unsigned int status;
spin_lock(&sport->port.lock);
/* Get the interrupts */
status = serial_in(sport, PNX8XXX_ISTAT) & serial_in(sport, PNX8XXX_IEN);
/* Byte or break signal received */
if (status & (PNX8XXX_UART_INT_RX | PNX8XXX_UART_INT_BREAK))
pnx8xxx_rx_chars(sport);
/* TX holding register empty - transmit a byte */
if (status & PNX8XXX_UART_INT_TX)
pnx8xxx_tx_chars(sport);
/* Clear the ISTAT register */
serial_out(sport, PNX8XXX_ICLR, status);
spin_unlock(&sport->port.lock);
return IRQ_HANDLED;
}
/*
* Return TIOCSER_TEMT when transmitter is not busy.
*/
static unsigned int pnx8xxx_tx_empty(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
return serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA ? 0 : TIOCSER_TEMT;
}
static unsigned int pnx8xxx_get_mctrl(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
unsigned int mctrl = TIOCM_DSR;
unsigned int msr;
/* REVISIT */
msr = serial_in(sport, PNX8XXX_MCR);
mctrl |= msr & PNX8XXX_UART_MCR_CTS ? TIOCM_CTS : 0;
mctrl |= msr & PNX8XXX_UART_MCR_DCD ? TIOCM_CAR : 0;
return mctrl;
}
static void pnx8xxx_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
#if 0 /* FIXME */
struct pnx8xxx_port *sport = (struct pnx8xxx_port *)port;
unsigned int msr;
#endif
}
/*
* Interrupts always disabled.
*/
static void pnx8xxx_break_ctl(struct uart_port *port, int break_state)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
unsigned long flags;
unsigned int lcr;
spin_lock_irqsave(&sport->port.lock, flags);
lcr = serial_in(sport, PNX8XXX_LCR);
if (break_state == -1)
lcr |= PNX8XXX_UART_LCR_TXBREAK;
else
lcr &= ~PNX8XXX_UART_LCR_TXBREAK;
serial_out(sport, PNX8XXX_LCR, lcr);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static int pnx8xxx_startup(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
int retval;
/*
* Allocate the IRQ
*/
retval = request_irq(sport->port.irq, pnx8xxx_int, 0,
"pnx8xxx-uart", sport);
if (retval)
return retval;
/*
* Finally, clear and enable interrupts
*/
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX |
PNX8XXX_UART_INT_ALLTX);
serial_out(sport, PNX8XXX_IEN, serial_in(sport, PNX8XXX_IEN) |
PNX8XXX_UART_INT_ALLRX |
PNX8XXX_UART_INT_ALLTX);
/*
* Enable modem status interrupts
*/
spin_lock_irq(&sport->port.lock);
pnx8xxx_enable_ms(&sport->port);
spin_unlock_irq(&sport->port.lock);
return 0;
}
static void pnx8xxx_shutdown(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
int lcr;
/*
* Stop our timer.
*/
del_timer_sync(&sport->timer);
/*
* Disable all interrupts
*/
serial_out(sport, PNX8XXX_IEN, 0);
/*
* Reset the Tx and Rx FIFOS, disable the break condition
*/
lcr = serial_in(sport, PNX8XXX_LCR);
lcr &= ~PNX8XXX_UART_LCR_TXBREAK;
lcr |= PNX8XXX_UART_LCR_TX_RST | PNX8XXX_UART_LCR_RX_RST;
serial_out(sport, PNX8XXX_LCR, lcr);
/*
* Clear all interrupts
*/
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_ALLRX |
PNX8XXX_UART_INT_ALLTX);
/*
* Free the interrupt
*/
free_irq(sport->port.irq, sport);
}
static void
pnx8xxx_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
unsigned long flags;
unsigned int lcr_fcr, old_ien, baud, quot;
unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8;
/*
* We only support CS7 and CS8.
*/
while ((termios->c_cflag & CSIZE) != CS7 &&
(termios->c_cflag & CSIZE) != CS8) {
termios->c_cflag &= ~CSIZE;
termios->c_cflag |= old_csize;
old_csize = CS8;
}
if ((termios->c_cflag & CSIZE) == CS8)
lcr_fcr = PNX8XXX_UART_LCR_8BIT;
else
lcr_fcr = 0;
if (termios->c_cflag & CSTOPB)
lcr_fcr |= PNX8XXX_UART_LCR_2STOPB;
if (termios->c_cflag & PARENB) {
lcr_fcr |= PNX8XXX_UART_LCR_PAREN;
if (!(termios->c_cflag & PARODD))
lcr_fcr |= PNX8XXX_UART_LCR_PAREVN;
}
/*
* 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);
spin_lock_irqsave(&sport->port.lock, flags);
sport->port.read_status_mask = ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN) |
ISTAT_TO_SM(PNX8XXX_UART_INT_EMPTY) |
ISTAT_TO_SM(PNX8XXX_UART_INT_RX);
if (termios->c_iflag & INPCK)
sport->port.read_status_mask |=
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
sport->port.read_status_mask |=
ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);
/*
* Characters to ignore
*/
sport->port.ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
sport->port.ignore_status_mask |=
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXFE) |
FIFO_TO_SM(PNX8XXX_UART_FIFO_RXPAR);
if (termios->c_iflag & IGNBRK) {
sport->port.ignore_status_mask |=
ISTAT_TO_SM(PNX8XXX_UART_INT_BREAK);
/*
* If we're ignoring parity and break indicators,
* ignore overruns too (for real raw support).
*/
if (termios->c_iflag & IGNPAR)
sport->port.ignore_status_mask |=
ISTAT_TO_SM(PNX8XXX_UART_INT_RXOVRN);
}
/*
* ignore all characters if CREAD is not set
*/
if ((termios->c_cflag & CREAD) == 0)
sport->port.ignore_status_mask |=
ISTAT_TO_SM(PNX8XXX_UART_INT_RX);
del_timer_sync(&sport->timer);
/*
* Update the per-port timeout.
*/
uart_update_timeout(port, termios->c_cflag, baud);
/*
* disable interrupts and drain transmitter
*/
old_ien = serial_in(sport, PNX8XXX_IEN);
serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX |
PNX8XXX_UART_INT_ALLRX));
while (serial_in(sport, PNX8XXX_FIFO) & PNX8XXX_UART_FIFO_TXFIFO_STA)
barrier();
/* then, disable everything */
serial_out(sport, PNX8XXX_IEN, 0);
/* Reset the Rx and Tx FIFOs too */
lcr_fcr |= PNX8XXX_UART_LCR_TX_RST;
lcr_fcr |= PNX8XXX_UART_LCR_RX_RST;
/* set the parity, stop bits and data size */
serial_out(sport, PNX8XXX_LCR, lcr_fcr);
/* set the baud rate */
quot -= 1;
serial_out(sport, PNX8XXX_BAUD, quot);
serial_out(sport, PNX8XXX_ICLR, -1);
serial_out(sport, PNX8XXX_IEN, old_ien);
if (UART_ENABLE_MS(&sport->port, termios->c_cflag))
pnx8xxx_enable_ms(&sport->port);
spin_unlock_irqrestore(&sport->port.lock, flags);
}
static const char *pnx8xxx_type(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
return sport->port.type == PORT_PNX8XXX ? "PNX8XXX" : NULL;
}
/*
* Release the memory region(s) being used by 'port'.
*/
static void pnx8xxx_release_port(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
release_mem_region(sport->port.mapbase, UART_PORT_SIZE);
}
/*
* Request the memory region(s) being used by 'port'.
*/
static int pnx8xxx_request_port(struct uart_port *port)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
return request_mem_region(sport->port.mapbase, UART_PORT_SIZE,
"pnx8xxx-uart") != NULL ? 0 : -EBUSY;
}
/*
* Configure/autoconfigure the port.
*/
static void pnx8xxx_config_port(struct uart_port *port, int flags)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
if (flags & UART_CONFIG_TYPE &&
pnx8xxx_request_port(&sport->port) == 0)
sport->port.type = PORT_PNX8XXX;
}
/*
* Verify the new serial_struct (for TIOCSSERIAL).
* The only change we allow are to the flags and type, and
* even then only between PORT_PNX8XXX and PORT_UNKNOWN
*/
static int
pnx8xxx_verify_port(struct uart_port *port, struct serial_struct *ser)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
int ret = 0;
if (ser->type != PORT_UNKNOWN && ser->type != PORT_PNX8XXX)
ret = -EINVAL;
if (sport->port.irq != ser->irq)
ret = -EINVAL;
if (ser->io_type != SERIAL_IO_MEM)
ret = -EINVAL;
if (sport->port.uartclk / 16 != ser->baud_base)
ret = -EINVAL;
if ((void *)sport->port.mapbase != ser->iomem_base)
ret = -EINVAL;
if (sport->port.iobase != ser->port)
ret = -EINVAL;
if (ser->hub6 != 0)
ret = -EINVAL;
return ret;
}
static struct uart_ops pnx8xxx_pops = {
.tx_empty = pnx8xxx_tx_empty,
.set_mctrl = pnx8xxx_set_mctrl,
.get_mctrl = pnx8xxx_get_mctrl,
.stop_tx = pnx8xxx_stop_tx,
.start_tx = pnx8xxx_start_tx,
.stop_rx = pnx8xxx_stop_rx,
.enable_ms = pnx8xxx_enable_ms,
.break_ctl = pnx8xxx_break_ctl,
.startup = pnx8xxx_startup,
.shutdown = pnx8xxx_shutdown,
.set_termios = pnx8xxx_set_termios,
.type = pnx8xxx_type,
.release_port = pnx8xxx_release_port,
.request_port = pnx8xxx_request_port,
.config_port = pnx8xxx_config_port,
.verify_port = pnx8xxx_verify_port,
};
/*
* Setup the PNX8XXX serial ports.
*
* Note also that we support "console=ttySx" where "x" is either 0 or 1.
*/
static void __init pnx8xxx_init_ports(void)
{
static int first = 1;
int i;
if (!first)
return;
first = 0;
for (i = 0; i < NR_PORTS; i++) {
init_timer(&pnx8xxx_ports[i].timer);
pnx8xxx_ports[i].timer.function = pnx8xxx_timeout;
pnx8xxx_ports[i].timer.data = (unsigned long)&pnx8xxx_ports[i];
pnx8xxx_ports[i].port.ops = &pnx8xxx_pops;
}
}
#ifdef CONFIG_SERIAL_PNX8XXX_CONSOLE
static void pnx8xxx_console_putchar(struct uart_port *port, int ch)
{
struct pnx8xxx_port *sport =
container_of(port, struct pnx8xxx_port, port);
int status;
do {
/* Wait for UART_TX register to empty */
status = serial_in(sport, PNX8XXX_FIFO);
} while (status & PNX8XXX_UART_FIFO_TXFIFO);
serial_out(sport, PNX8XXX_FIFO, ch);
}
/*
* Interrupts are disabled on entering
*/static void
pnx8xxx_console_write(struct console *co, const char *s, unsigned int count)
{
struct pnx8xxx_port *sport = &pnx8xxx_ports[co->index];
unsigned int old_ien, status;
/*
* First, save IEN and then disable interrupts
*/
old_ien = serial_in(sport, PNX8XXX_IEN);
serial_out(sport, PNX8XXX_IEN, old_ien & ~(PNX8XXX_UART_INT_ALLTX |
PNX8XXX_UART_INT_ALLRX));
uart_console_write(&sport->port, s, count, pnx8xxx_console_putchar);
/*
* Finally, wait for transmitter to become empty
* and restore IEN
*/
do {
/* Wait for UART_TX register to empty */
status = serial_in(sport, PNX8XXX_FIFO);
} while (status & PNX8XXX_UART_FIFO_TXFIFO);
/* Clear TX and EMPTY interrupt */
serial_out(sport, PNX8XXX_ICLR, PNX8XXX_UART_INT_TX |
PNX8XXX_UART_INT_EMPTY);
serial_out(sport, PNX8XXX_IEN, old_ien);
}
static int __init
pnx8xxx_console_setup(struct console *co, char *options)
{
struct pnx8xxx_port *sport;
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 == -1 || co->index >= NR_PORTS)
co->index = 0;
sport = &pnx8xxx_ports[co->index];
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(&sport->port, co, baud, parity, bits, flow);
}
static struct uart_driver pnx8xxx_reg;
static struct console pnx8xxx_console = {
.name = "ttyS",
.write = pnx8xxx_console_write,
.device = uart_console_device,
.setup = pnx8xxx_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &pnx8xxx_reg,
};
static int __init pnx8xxx_rs_console_init(void)
{
pnx8xxx_init_ports();
register_console(&pnx8xxx_console);
return 0;
}
console_initcall(pnx8xxx_rs_console_init);
#define PNX8XXX_CONSOLE &pnx8xxx_console
#else
#define PNX8XXX_CONSOLE NULL
#endif
static struct uart_driver pnx8xxx_reg = {
.owner = THIS_MODULE,
.driver_name = "ttyS",
.dev_name = "ttyS",
.major = SERIAL_PNX8XXX_MAJOR,
.minor = MINOR_START,
.nr = NR_PORTS,
.cons = PNX8XXX_CONSOLE,
};
static int pnx8xxx_serial_suspend(struct platform_device *pdev, pm_message_t state)
{
struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
return uart_suspend_port(&pnx8xxx_reg, &sport->port);
}
static int pnx8xxx_serial_resume(struct platform_device *pdev)
{
struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
return uart_resume_port(&pnx8xxx_reg, &sport->port);
}
static int pnx8xxx_serial_probe(struct platform_device *pdev)
{
struct resource *res = pdev->resource;
int i;
for (i = 0; i < pdev->num_resources; i++, res++) {
if (!(res->flags & IORESOURCE_MEM))
continue;
for (i = 0; i < NR_PORTS; i++) {
if (pnx8xxx_ports[i].port.mapbase != res->start)
continue;
pnx8xxx_ports[i].port.dev = &pdev->dev;
uart_add_one_port(&pnx8xxx_reg, &pnx8xxx_ports[i].port);
platform_set_drvdata(pdev, &pnx8xxx_ports[i]);
break;
}
}
return 0;
}
static int pnx8xxx_serial_remove(struct platform_device *pdev)
{
struct pnx8xxx_port *sport = platform_get_drvdata(pdev);
if (sport)
uart_remove_one_port(&pnx8xxx_reg, &sport->port);
return 0;
}
static struct platform_driver pnx8xxx_serial_driver = {
.driver = {
.name = "pnx8xxx-uart",
},
.probe = pnx8xxx_serial_probe,
.remove = pnx8xxx_serial_remove,
.suspend = pnx8xxx_serial_suspend,
.resume = pnx8xxx_serial_resume,
};
static int __init pnx8xxx_serial_init(void)
{
int ret;
printk(KERN_INFO "Serial: PNX8XXX driver\n");
pnx8xxx_init_ports();
ret = uart_register_driver(&pnx8xxx_reg);
if (ret == 0) {
ret = platform_driver_register(&pnx8xxx_serial_driver);
if (ret)
uart_unregister_driver(&pnx8xxx_reg);
}
return ret;
}
static void __exit pnx8xxx_serial_exit(void)
{
platform_driver_unregister(&pnx8xxx_serial_driver);
uart_unregister_driver(&pnx8xxx_reg);
}
module_init(pnx8xxx_serial_init);
module_exit(pnx8xxx_serial_exit);
MODULE_AUTHOR("Embedded Alley Solutions, Inc.");
MODULE_DESCRIPTION("PNX8XXX SoCs serial port driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(SERIAL_PNX8XXX_MAJOR);
MODULE_ALIAS("platform:pnx8xxx-uart");