android_kernel_xiaomi_sm8350/drivers/serial/pxa.c
Kay Sievers e169c13964 serial: fix platform driver hotplug/coldplug
Since 43cc71eed1, the platform modalias is
prefixed with "platform:".  Add MODULE_ALIAS() to the hotpluggable serial
platform drivers, to re-enable auto loading.

NOTE that Kconfig for some of these drivers doesn't allow modular builds, and
thus doesn't match the driver source's unload support.  Presumably their
unload code is buggy and/or weakly tested...

[dbrownell@users.sourceforge.net: more drivers, registration fixes]
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-04-15 19:35:40 -07:00

866 lines
20 KiB
C

/*
* linux/drivers/serial/pxa.c
*
* Based on drivers/serial/8250.c by Russell King.
*
* Author: Nicolas Pitre
* Created: Feb 20, 2003
* Copyright: (C) 2003 Monta Vista Software, Inc.
*
* 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.
*
* Note 1: This driver is made separate from the already too overloaded
* 8250.c because it needs some kirks of its own and that'll make it
* easier to add DMA support.
*
* Note 2: I'm too sick of device allocation policies for serial ports.
* If someone else wants to request an "official" allocation of major/minor
* for this driver please be my guest. And don't forget that new hardware
* to come from Intel might have more than 3 or 4 of those UARTs. Let's
* hope for a better port registration and dynamic device allocation scheme
* with the serial core maintainer satisfaction to appear soon.
*/
#if defined(CONFIG_SERIAL_PXA_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/serial_reg.h>
#include <linux/circ_buf.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
#include <linux/clk.h>
#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/arch/pxa-regs.h>
struct uart_pxa_port {
struct uart_port port;
unsigned char ier;
unsigned char lcr;
unsigned char mcr;
unsigned int lsr_break_flag;
struct clk *clk;
char *name;
};
static inline unsigned int serial_in(struct uart_pxa_port *up, int offset)
{
offset <<= 2;
return readl(up->port.membase + offset);
}
static inline void serial_out(struct uart_pxa_port *up, int offset, int value)
{
offset <<= 2;
writel(value, up->port.membase + offset);
}
static void serial_pxa_enable_ms(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
up->ier |= UART_IER_MSI;
serial_out(up, UART_IER, up->ier);
}
static void serial_pxa_stop_tx(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
if (up->ier & UART_IER_THRI) {
up->ier &= ~UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
}
}
static void serial_pxa_stop_rx(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
up->ier &= ~UART_IER_RLSI;
up->port.read_status_mask &= ~UART_LSR_DR;
serial_out(up, UART_IER, up->ier);
}
static inline void receive_chars(struct uart_pxa_port *up, int *status)
{
struct tty_struct *tty = up->port.info->tty;
unsigned int ch, flag;
int max_count = 256;
do {
ch = serial_in(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++;
/*
* 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 ignored.
*/
*status &= up->port.read_status_mask;
#ifdef CONFIG_SERIAL_PXA_CONSOLE
if (up->port.line == up->port.cons->index) {
/* Recover the break flag from console xmit */
*status |= up->lsr_break_flag;
up->lsr_break_flag = 0;
}
#endif
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))
goto ignore_char;
uart_insert_char(&up->port, *status, UART_LSR_OE, ch, flag);
ignore_char:
*status = serial_in(up, UART_LSR);
} while ((*status & UART_LSR_DR) && (max_count-- > 0));
tty_flip_buffer_push(tty);
}
static void transmit_chars(struct uart_pxa_port *up)
{
struct circ_buf *xmit = &up->port.info->xmit;
int count;
if (up->port.x_char) {
serial_out(up, UART_TX, up->port.x_char);
up->port.icount.tx++;
up->port.x_char = 0;
return;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
serial_pxa_stop_tx(&up->port);
return;
}
count = up->port.fifosize / 2;
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))
serial_pxa_stop_tx(&up->port);
}
static void serial_pxa_start_tx(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
if (!(up->ier & UART_IER_THRI)) {
up->ier |= UART_IER_THRI;
serial_out(up, UART_IER, up->ier);
}
}
static inline void check_modem_status(struct uart_pxa_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);
}
/*
* This handles the interrupt from one port.
*/
static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
{
struct uart_pxa_port *up = dev_id;
unsigned int iir, lsr;
iir = serial_in(up, UART_IIR);
if (iir & UART_IIR_NO_INT)
return IRQ_NONE;
lsr = serial_in(up, UART_LSR);
if (lsr & UART_LSR_DR)
receive_chars(up, &lsr);
check_modem_status(up);
if (lsr & UART_LSR_THRE)
transmit_chars(up);
return IRQ_HANDLED;
}
static unsigned int serial_pxa_tx_empty(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_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 serial_pxa_get_mctrl(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_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 serial_pxa_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_pxa_port *up = (struct uart_pxa_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;
mcr |= up->mcr;
serial_out(up, UART_MCR, mcr);
}
static void serial_pxa_break_ctl(struct uart_port *port, int break_state)
{
struct uart_pxa_port *up = (struct uart_pxa_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);
}
#if 0
static void serial_pxa_dma_init(struct pxa_uart *up)
{
up->rxdma =
pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_receive_dma, up);
if (up->rxdma < 0)
goto out;
up->txdma =
pxa_request_dma(up->name, DMA_PRIO_LOW, pxa_transmit_dma, up);
if (up->txdma < 0)
goto err_txdma;
up->dmadesc = kmalloc(4 * sizeof(pxa_dma_desc), GFP_KERNEL);
if (!up->dmadesc)
goto err_alloc;
/* ... */
err_alloc:
pxa_free_dma(up->txdma);
err_rxdma:
pxa_free_dma(up->rxdma);
out:
return;
}
#endif
static int serial_pxa_startup(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
unsigned long flags;
int retval;
if (port->line == 3) /* HWUART */
up->mcr |= UART_MCR_AFE;
else
up->mcr = 0;
up->port.uartclk = clk_get_rate(up->clk);
/*
* Allocate the IRQ
*/
retval = request_irq(up->port.irq, serial_pxa_irq, 0, up->name, up);
if (retval)
return retval;
/*
* Clear the FIFO buffers and disable them.
* (they will be reenabled in set_termios())
*/
serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO);
serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT);
serial_out(up, UART_FCR, 0);
/*
* Clear the interrupt registers.
*/
(void) serial_in(up, UART_LSR);
(void) serial_in(up, UART_RX);
(void) serial_in(up, UART_IIR);
(void) serial_in(up, UART_MSR);
/*
* Now, initialize the UART
*/
serial_out(up, UART_LCR, UART_LCR_WLEN8);
spin_lock_irqsave(&up->port.lock, flags);
up->port.mctrl |= TIOCM_OUT2;
serial_pxa_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 | UART_IER_RTOIE | UART_IER_UUE;
serial_out(up, UART_IER, up->ier);
/*
* And clear the interrupt registers again for luck.
*/
(void) serial_in(up, UART_LSR);
(void) serial_in(up, UART_RX);
(void) serial_in(up, UART_IIR);
(void) serial_in(up, UART_MSR);
return 0;
}
static void serial_pxa_shutdown(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
unsigned long flags;
free_irq(up->port.irq, up);
/*
* Disable interrupts from this port
*/
up->ier = 0;
serial_out(up, UART_IER, 0);
spin_lock_irqsave(&up->port.lock, flags);
up->port.mctrl &= ~TIOCM_OUT2;
serial_pxa_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_in(up, UART_LCR) & ~UART_LCR_SBC);
serial_out(up, UART_FCR, UART_FCR_ENABLE_FIFO |
UART_FCR_CLEAR_RCVR |
UART_FCR_CLEAR_XMIT);
serial_out(up, UART_FCR, 0);
}
static void
serial_pxa_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
unsigned char cval, fcr = 0;
unsigned long flags;
unsigned int baud, quot;
switch (termios->c_cflag & CSIZE) {
case CS5:
cval = UART_LCR_WLEN5;
break;
case CS6:
cval = UART_LCR_WLEN6;
break;
case CS7:
cval = UART_LCR_WLEN7;
break;
default:
case CS8:
cval = UART_LCR_WLEN8;
break;
}
if (termios->c_cflag & CSTOPB)
cval |= UART_LCR_STOP;
if (termios->c_cflag & PARENB)
cval |= UART_LCR_PARITY;
if (!(termios->c_cflag & PARODD))
cval |= UART_LCR_EPAR;
/*
* 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);
if ((up->port.uartclk / quot) < (2400 * 16))
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR1;
else if ((up->port.uartclk / quot) < (230400 * 16))
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR8;
else
fcr = UART_FCR_ENABLE_FIFO | UART_FCR_PXAR32;
/*
* Ok, we're now changing the port state. Do it with
* interrupts disabled.
*/
spin_lock_irqsave(&up->port.lock, flags);
/*
* Ensure the port will be enabled.
* This is required especially for serial console.
*/
up->ier |= IER_UUE;
/*
* Update the per-port timeout.
*/
uart_update_timeout(port, termios->c_cflag, baud);
up->port.read_status_mask = UART_LSR_OE | UART_LSR_THRE | UART_LSR_DR;
if (termios->c_iflag & INPCK)
up->port.read_status_mask |= UART_LSR_FE | UART_LSR_PE;
if (termios->c_iflag & (BRKINT | PARMRK))
up->port.read_status_mask |= UART_LSR_BI;
/*
* Characters to ignore
*/
up->port.ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
up->port.ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
if (termios->c_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 (termios->c_iflag & IGNPAR)
up->port.ignore_status_mask |= UART_LSR_OE;
}
/*
* ignore all characters if CREAD is not set
*/
if ((termios->c_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, termios->c_cflag))
up->ier |= UART_IER_MSI;
serial_out(up, UART_IER, up->ier);
serial_out(up, UART_LCR, cval | UART_LCR_DLAB);/* set DLAB */
serial_out(up, UART_DLL, quot & 0xff); /* LS of divisor */
serial_out(up, UART_DLM, quot >> 8); /* MS of divisor */
serial_out(up, UART_LCR, cval); /* reset DLAB */
up->lcr = cval; /* Save LCR */
serial_pxa_set_mctrl(&up->port, up->port.mctrl);
serial_out(up, UART_FCR, fcr);
spin_unlock_irqrestore(&up->port.lock, flags);
}
static void
serial_pxa_pm(struct uart_port *port, unsigned int state,
unsigned int oldstate)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
if (!state)
clk_enable(up->clk);
else
clk_disable(up->clk);
}
static void serial_pxa_release_port(struct uart_port *port)
{
}
static int serial_pxa_request_port(struct uart_port *port)
{
return 0;
}
static void serial_pxa_config_port(struct uart_port *port, int flags)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
up->port.type = PORT_PXA;
}
static int
serial_pxa_verify_port(struct uart_port *port, struct serial_struct *ser)
{
/* we don't want the core code to modify any port params */
return -EINVAL;
}
static const char *
serial_pxa_type(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
return up->name;
}
static struct uart_pxa_port *serial_pxa_ports[4];
static struct uart_driver serial_pxa_reg;
#ifdef CONFIG_SERIAL_PXA_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_pxa_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 & UPF_CONS_FLOW) {
tmout = 1000000;
while (--tmout &&
((serial_in(up, UART_MSR) & UART_MSR_CTS) == 0))
udelay(1);
}
}
static void serial_pxa_console_putchar(struct uart_port *port, int ch)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
wait_for_xmitr(up);
serial_out(up, UART_TX, ch);
}
/*
* Print a string to the serial port trying not to disturb
* any possible real use of the port...
*
* The console_lock must be held when we get here.
*/
static void
serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
{
struct uart_pxa_port *up = serial_pxa_ports[co->index];
unsigned int ier;
clk_enable(up->clk);
/*
* First save the IER then disable the interrupts
*/
ier = serial_in(up, UART_IER);
serial_out(up, UART_IER, UART_IER_UUE);
uart_console_write(&up->port, s, count, serial_pxa_console_putchar);
/*
* Finally, wait for transmitter to become empty
* and restore the IER
*/
wait_for_xmitr(up);
serial_out(up, UART_IER, ier);
clk_disable(up->clk);
}
static int __init
serial_pxa_console_setup(struct console *co, char *options)
{
struct uart_pxa_port *up;
int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
if (co->index == -1 || co->index >= serial_pxa_reg.nr)
co->index = 0;
up = serial_pxa_ports[co->index];
if (!up)
return -ENODEV;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(&up->port, co, baud, parity, bits, flow);
}
static struct console serial_pxa_console = {
.name = "ttyS",
.write = serial_pxa_console_write,
.device = uart_console_device,
.setup = serial_pxa_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &serial_pxa_reg,
};
#define PXA_CONSOLE &serial_pxa_console
#else
#define PXA_CONSOLE NULL
#endif
struct uart_ops serial_pxa_pops = {
.tx_empty = serial_pxa_tx_empty,
.set_mctrl = serial_pxa_set_mctrl,
.get_mctrl = serial_pxa_get_mctrl,
.stop_tx = serial_pxa_stop_tx,
.start_tx = serial_pxa_start_tx,
.stop_rx = serial_pxa_stop_rx,
.enable_ms = serial_pxa_enable_ms,
.break_ctl = serial_pxa_break_ctl,
.startup = serial_pxa_startup,
.shutdown = serial_pxa_shutdown,
.set_termios = serial_pxa_set_termios,
.pm = serial_pxa_pm,
.type = serial_pxa_type,
.release_port = serial_pxa_release_port,
.request_port = serial_pxa_request_port,
.config_port = serial_pxa_config_port,
.verify_port = serial_pxa_verify_port,
};
static struct uart_driver serial_pxa_reg = {
.owner = THIS_MODULE,
.driver_name = "PXA serial",
.dev_name = "ttyS",
.major = TTY_MAJOR,
.minor = 64,
.nr = 4,
.cons = PXA_CONSOLE,
};
static int serial_pxa_suspend(struct platform_device *dev, pm_message_t state)
{
struct uart_pxa_port *sport = platform_get_drvdata(dev);
if (sport)
uart_suspend_port(&serial_pxa_reg, &sport->port);
return 0;
}
static int serial_pxa_resume(struct platform_device *dev)
{
struct uart_pxa_port *sport = platform_get_drvdata(dev);
if (sport)
uart_resume_port(&serial_pxa_reg, &sport->port);
return 0;
}
static int serial_pxa_probe(struct platform_device *dev)
{
struct uart_pxa_port *sport;
struct resource *mmres, *irqres;
int ret;
mmres = platform_get_resource(dev, IORESOURCE_MEM, 0);
irqres = platform_get_resource(dev, IORESOURCE_IRQ, 0);
if (!mmres || !irqres)
return -ENODEV;
sport = kzalloc(sizeof(struct uart_pxa_port), GFP_KERNEL);
if (!sport)
return -ENOMEM;
sport->clk = clk_get(&dev->dev, "UARTCLK");
if (IS_ERR(sport->clk)) {
ret = PTR_ERR(sport->clk);
goto err_free;
}
sport->port.type = PORT_PXA;
sport->port.iotype = UPIO_MEM;
sport->port.mapbase = mmres->start;
sport->port.irq = irqres->start;
sport->port.fifosize = 64;
sport->port.ops = &serial_pxa_pops;
sport->port.line = dev->id;
sport->port.dev = &dev->dev;
sport->port.flags = UPF_IOREMAP | UPF_BOOT_AUTOCONF;
sport->port.uartclk = clk_get_rate(sport->clk);
/*
* Is it worth keeping this?
*/
if (mmres->start == __PREG(FFUART))
sport->name = "FFUART";
else if (mmres->start == __PREG(BTUART))
sport->name = "BTUART";
else if (mmres->start == __PREG(STUART))
sport->name = "STUART";
else if (mmres->start == __PREG(HWUART))
sport->name = "HWUART";
else
sport->name = "???";
sport->port.membase = ioremap(mmres->start, mmres->end - mmres->start + 1);
if (!sport->port.membase) {
ret = -ENOMEM;
goto err_clk;
}
serial_pxa_ports[dev->id] = sport;
uart_add_one_port(&serial_pxa_reg, &sport->port);
platform_set_drvdata(dev, sport);
return 0;
err_clk:
clk_put(sport->clk);
err_free:
kfree(sport);
return ret;
}
static int serial_pxa_remove(struct platform_device *dev)
{
struct uart_pxa_port *sport = platform_get_drvdata(dev);
platform_set_drvdata(dev, NULL);
uart_remove_one_port(&serial_pxa_reg, &sport->port);
clk_put(sport->clk);
kfree(sport);
return 0;
}
static struct platform_driver serial_pxa_driver = {
.probe = serial_pxa_probe,
.remove = serial_pxa_remove,
.suspend = serial_pxa_suspend,
.resume = serial_pxa_resume,
.driver = {
.name = "pxa2xx-uart",
.owner = THIS_MODULE,
},
};
int __init serial_pxa_init(void)
{
int ret;
ret = uart_register_driver(&serial_pxa_reg);
if (ret != 0)
return ret;
ret = platform_driver_register(&serial_pxa_driver);
if (ret != 0)
uart_unregister_driver(&serial_pxa_reg);
return ret;
}
void __exit serial_pxa_exit(void)
{
platform_driver_unregister(&serial_pxa_driver);
uart_unregister_driver(&serial_pxa_reg);
}
module_init(serial_pxa_init);
module_exit(serial_pxa_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pxa2xx-uart");