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alistair23-linux/drivers/serial/mcf.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

655 lines
17 KiB
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/****************************************************************************/
/*
* mcf.c -- Freescale ColdFire UART driver
*
* (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
*
* 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.
*/
/****************************************************************************/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/console.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/io.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/mcfuart.h>
#include <asm/nettel.h>
/****************************************************************************/
/*
* Some boards implement the DTR/DCD lines using GPIO lines, most
* don't. Dummy out the access macros for those that don't. Those
* that do should define these macros somewhere in there board
* specific inlude files.
*/
#if !defined(mcf_getppdcd)
#define mcf_getppdcd(p) (1)
#endif
#if !defined(mcf_getppdtr)
#define mcf_getppdtr(p) (1)
#endif
#if !defined(mcf_setppdtr)
#define mcf_setppdtr(p, v) do { } while (0)
#endif
/****************************************************************************/
/*
* Local per-uart structure.
*/
struct mcf_uart {
struct uart_port port;
unsigned int sigs; /* Local copy of line sigs */
unsigned char imr; /* Local IMR mirror */
};
/****************************************************************************/
static unsigned int mcf_tx_empty(struct uart_port *port)
{
return (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXEMPTY) ?
TIOCSER_TEMT : 0;
}
/****************************************************************************/
static unsigned int mcf_get_mctrl(struct uart_port *port)
{
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
unsigned long flags;
unsigned int sigs;
spin_lock_irqsave(&port->lock, flags);
sigs = (readb(port->membase + MCFUART_UIPR) & MCFUART_UIPR_CTS) ?
0 : TIOCM_CTS;
sigs |= (pp->sigs & TIOCM_RTS);
sigs |= (mcf_getppdcd(port->line) ? TIOCM_CD : 0);
sigs |= (mcf_getppdtr(port->line) ? TIOCM_DTR : 0);
spin_unlock_irqrestore(&port->lock, flags);
return sigs;
}
/****************************************************************************/
static void mcf_set_mctrl(struct uart_port *port, unsigned int sigs)
{
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
pp->sigs = sigs;
mcf_setppdtr(port->line, (sigs & TIOCM_DTR));
if (sigs & TIOCM_RTS)
writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
else
writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP0);
spin_unlock_irqrestore(&port->lock, flags);
}
/****************************************************************************/
static void mcf_start_tx(struct uart_port *port)
{
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
pp->imr |= MCFUART_UIR_TXREADY;
writeb(pp->imr, port->membase + MCFUART_UIMR);
spin_unlock_irqrestore(&port->lock, flags);
}
/****************************************************************************/
static void mcf_stop_tx(struct uart_port *port)
{
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
pp->imr &= ~MCFUART_UIR_TXREADY;
writeb(pp->imr, port->membase + MCFUART_UIMR);
spin_unlock_irqrestore(&port->lock, flags);
}
/****************************************************************************/
static void mcf_stop_rx(struct uart_port *port)
{
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
pp->imr &= ~MCFUART_UIR_RXREADY;
writeb(pp->imr, port->membase + MCFUART_UIMR);
spin_unlock_irqrestore(&port->lock, flags);
}
/****************************************************************************/
static void mcf_break_ctl(struct uart_port *port, int break_state)
{
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
if (break_state == -1)
writeb(MCFUART_UCR_CMDBREAKSTART, port->membase + MCFUART_UCR);
else
writeb(MCFUART_UCR_CMDBREAKSTOP, port->membase + MCFUART_UCR);
spin_unlock_irqrestore(&port->lock, flags);
}
/****************************************************************************/
static void mcf_enable_ms(struct uart_port *port)
{
}
/****************************************************************************/
static int mcf_startup(struct uart_port *port)
{
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
/* Reset UART, get it into known state... */
writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
/* Enable the UART transmitter and receiver */
writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
port->membase + MCFUART_UCR);
/* Enable RX interrupts now */
pp->imr = MCFUART_UIR_RXREADY;
writeb(pp->imr, port->membase + MCFUART_UIMR);
spin_unlock_irqrestore(&port->lock, flags);
return 0;
}
/****************************************************************************/
static void mcf_shutdown(struct uart_port *port)
{
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
/* Disable all interrupts now */
pp->imr = 0;
writeb(pp->imr, port->membase + MCFUART_UIMR);
/* Disable UART transmitter and receiver */
writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
spin_unlock_irqrestore(&port->lock, flags);
}
/****************************************************************************/
static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
unsigned long flags;
unsigned int baud, baudclk;
unsigned char mr1, mr2;
baud = uart_get_baud_rate(port, termios, old, 0, 230400);
baudclk = ((MCF_BUSCLK / baud) + 16) / 32;
mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
mr2 = 0;
switch (termios->c_cflag & CSIZE) {
case CS5: mr1 |= MCFUART_MR1_CS5; break;
case CS6: mr1 |= MCFUART_MR1_CS6; break;
case CS7: mr1 |= MCFUART_MR1_CS7; break;
case CS8:
default: mr1 |= MCFUART_MR1_CS8; break;
}
if (termios->c_cflag & PARENB) {
if (termios->c_cflag & CMSPAR) {
if (termios->c_cflag & PARODD)
mr1 |= MCFUART_MR1_PARITYMARK;
else
mr1 |= MCFUART_MR1_PARITYSPACE;
} else {
if (termios->c_cflag & PARODD)
mr1 |= MCFUART_MR1_PARITYODD;
else
mr1 |= MCFUART_MR1_PARITYEVEN;
}
} else {
mr1 |= MCFUART_MR1_PARITYNONE;
}
if (termios->c_cflag & CSTOPB)
mr2 |= MCFUART_MR2_STOP2;
else
mr2 |= MCFUART_MR2_STOP1;
if (termios->c_cflag & CRTSCTS) {
mr1 |= MCFUART_MR1_RXRTS;
mr2 |= MCFUART_MR2_TXCTS;
}
spin_lock_irqsave(&port->lock, flags);
writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
writeb(MCFUART_UCR_CMDRESETMRPTR, port->membase + MCFUART_UCR);
writeb(mr1, port->membase + MCFUART_UMR);
writeb(mr2, port->membase + MCFUART_UMR);
writeb((baudclk & 0xff00) >> 8, port->membase + MCFUART_UBG1);
writeb((baudclk & 0xff), port->membase + MCFUART_UBG2);
writeb(MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER,
port->membase + MCFUART_UCSR);
writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
port->membase + MCFUART_UCR);
spin_unlock_irqrestore(&port->lock, flags);
}
/****************************************************************************/
static void mcf_rx_chars(struct mcf_uart *pp)
{
struct uart_port *port = &pp->port;
unsigned char status, ch, flag;
while ((status = readb(port->membase + MCFUART_USR)) & MCFUART_USR_RXREADY) {
ch = readb(port->membase + MCFUART_URB);
flag = TTY_NORMAL;
port->icount.rx++;
if (status & MCFUART_USR_RXERR) {
writeb(MCFUART_UCR_CMDRESETERR,
port->membase + MCFUART_UCR);
if (status & MCFUART_USR_RXBREAK) {
port->icount.brk++;
if (uart_handle_break(port))
continue;
} else if (status & MCFUART_USR_RXPARITY) {
port->icount.parity++;
} else if (status & MCFUART_USR_RXOVERRUN) {
port->icount.overrun++;
} else if (status & MCFUART_USR_RXFRAMING) {
port->icount.frame++;
}
status &= port->read_status_mask;
if (status & MCFUART_USR_RXBREAK)
flag = TTY_BREAK;
else if (status & MCFUART_USR_RXPARITY)
flag = TTY_PARITY;
else if (status & MCFUART_USR_RXFRAMING)
flag = TTY_FRAME;
}
if (uart_handle_sysrq_char(port, ch))
continue;
uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
}
tty_flip_buffer_push(port->info->tty);
}
/****************************************************************************/
static void mcf_tx_chars(struct mcf_uart *pp)
{
struct uart_port *port = &pp->port;
struct circ_buf *xmit = &port->info->xmit;
if (port->x_char) {
/* Send special char - probably flow control */
writeb(port->x_char, port->membase + MCFUART_UTB);
port->x_char = 0;
port->icount.tx++;
return;
}
while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
if (xmit->head == xmit->tail)
break;
writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
port->icount.tx++;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (xmit->head == xmit->tail) {
pp->imr &= ~MCFUART_UIR_TXREADY;
writeb(pp->imr, port->membase + MCFUART_UIMR);
}
}
/****************************************************************************/
static irqreturn_t mcf_interrupt(int irq, void *data)
{
struct uart_port *port = data;
struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
unsigned int isr;
isr = readb(port->membase + MCFUART_UISR) & pp->imr;
if (isr & MCFUART_UIR_RXREADY)
mcf_rx_chars(pp);
if (isr & MCFUART_UIR_TXREADY)
mcf_tx_chars(pp);
return IRQ_HANDLED;
}
/****************************************************************************/
static void mcf_config_port(struct uart_port *port, int flags)
{
port->type = PORT_MCF;
/* Clear mask, so no surprise interrupts. */
writeb(0, port->membase + MCFUART_UIMR);
if (request_irq(port->irq, mcf_interrupt, IRQF_DISABLED, "UART", port))
printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
"interrupt vector=%d\n", port->line, port->irq);
}
/****************************************************************************/
static const char *mcf_type(struct uart_port *port)
{
return (port->type == PORT_MCF) ? "ColdFire UART" : NULL;
}
/****************************************************************************/
static int mcf_request_port(struct uart_port *port)
{
/* UARTs always present */
return 0;
}
/****************************************************************************/
static void mcf_release_port(struct uart_port *port)
{
/* Nothing to release... */
}
/****************************************************************************/
static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
{
if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_MCF))
return -EINVAL;
return 0;
}
/****************************************************************************/
/*
* Define the basic serial functions we support.
*/
static struct uart_ops mcf_uart_ops = {
.tx_empty = mcf_tx_empty,
.get_mctrl = mcf_get_mctrl,
.set_mctrl = mcf_set_mctrl,
.start_tx = mcf_start_tx,
.stop_tx = mcf_stop_tx,
.stop_rx = mcf_stop_rx,
.enable_ms = mcf_enable_ms,
.break_ctl = mcf_break_ctl,
.startup = mcf_startup,
.shutdown = mcf_shutdown,
.set_termios = mcf_set_termios,
.type = mcf_type,
.request_port = mcf_request_port,
.release_port = mcf_release_port,
.config_port = mcf_config_port,
.verify_port = mcf_verify_port,
};
static struct mcf_uart mcf_ports[3];
#define MCF_MAXPORTS ARRAY_SIZE(mcf_ports)
/****************************************************************************/
#if defined(CONFIG_SERIAL_MCF_CONSOLE)
/****************************************************************************/
int __init early_mcf_setup(struct mcf_platform_uart *platp)
{
struct uart_port *port;
int i;
for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
port = &mcf_ports[i].port;
port->line = i;
port->type = PORT_MCF;
port->mapbase = platp[i].mapbase;
port->membase = (platp[i].membase) ? platp[i].membase :
(unsigned char __iomem *) port->mapbase;
port->iotype = SERIAL_IO_MEM;
port->irq = platp[i].irq;
port->uartclk = MCF_BUSCLK;
port->flags = ASYNC_BOOT_AUTOCONF;
port->ops = &mcf_uart_ops;
}
return 0;
}
/****************************************************************************/
static void mcf_console_putc(struct console *co, const char c)
{
struct uart_port *port = &(mcf_ports + co->index)->port;
int i;
for (i = 0; (i < 0x10000); i++) {
if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
break;
}
writeb(c, port->membase + MCFUART_UTB);
for (i = 0; (i < 0x10000); i++) {
if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
break;
}
}
/****************************************************************************/
static void mcf_console_write(struct console *co, const char *s, unsigned int count)
{
for (; (count); count--, s++) {
mcf_console_putc(co, *s);
if (*s == '\n')
mcf_console_putc(co, '\r');
}
}
/****************************************************************************/
static int __init mcf_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = CONFIG_SERIAL_MCF_BAUDRATE;
int bits = 8;
int parity = 'n';
int flow = 'n';
if ((co->index >= 0) && (co->index <= MCF_MAXPORTS))
co->index = 0;
port = &mcf_ports[co->index].port;
if (port->membase == 0)
return -ENODEV;
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(port, co, baud, parity, bits, flow);
}
/****************************************************************************/
static struct uart_driver mcf_driver;
static struct console mcf_console = {
.name = "ttyS",
.write = mcf_console_write,
.device = uart_console_device,
.setup = mcf_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &mcf_driver,
};
static int __init mcf_console_init(void)
{
register_console(&mcf_console);
return 0;
}
console_initcall(mcf_console_init);
#define MCF_CONSOLE &mcf_console
/****************************************************************************/
#else
/****************************************************************************/
#define MCF_CONSOLE NULL
/****************************************************************************/
#endif /* CONFIG_MCF_CONSOLE */
/****************************************************************************/
/*
* Define the mcf UART driver structure.
*/
static struct uart_driver mcf_driver = {
.owner = THIS_MODULE,
.driver_name = "mcf",
.dev_name = "ttyS",
.major = TTY_MAJOR,
.minor = 64,
.nr = MCF_MAXPORTS,
.cons = MCF_CONSOLE,
};
/****************************************************************************/
static int __devinit mcf_probe(struct platform_device *pdev)
{
struct mcf_platform_uart *platp = pdev->dev.platform_data;
struct uart_port *port;
int i;
for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
port = &mcf_ports[i].port;
port->line = i;
port->type = PORT_MCF;
port->mapbase = platp[i].mapbase;
port->membase = (platp[i].membase) ? platp[i].membase :
(unsigned char __iomem *) platp[i].mapbase;
port->iotype = SERIAL_IO_MEM;
port->irq = platp[i].irq;
port->uartclk = MCF_BUSCLK;
port->ops = &mcf_uart_ops;
port->flags = ASYNC_BOOT_AUTOCONF;
uart_add_one_port(&mcf_driver, port);
}
return 0;
}
/****************************************************************************/
static int mcf_remove(struct platform_device *pdev)
{
struct uart_port *port;
int i;
for (i = 0; (i < MCF_MAXPORTS); i++) {
port = &mcf_ports[i].port;
if (port)
uart_remove_one_port(&mcf_driver, port);
}
return 0;
}
/****************************************************************************/
static struct platform_driver mcf_platform_driver = {
.probe = mcf_probe,
.remove = __devexit_p(mcf_remove),
.driver = {
.name = "mcfuart",
.owner = THIS_MODULE,
},
};
/****************************************************************************/
static int __init mcf_init(void)
{
int rc;
printk("ColdFire internal UART serial driver\n");
rc = uart_register_driver(&mcf_driver);
if (rc)
return rc;
rc = platform_driver_register(&mcf_platform_driver);
if (rc)
return rc;
return 0;
}
/****************************************************************************/
static void __exit mcf_exit(void)
{
platform_driver_unregister(&mcf_platform_driver);
uart_unregister_driver(&mcf_driver);
}
/****************************************************************************/
module_init(mcf_init);
module_exit(mcf_exit);
MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>");
MODULE_DESCRIPTION("Freescale ColdFire UART driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:mcfuart");
/****************************************************************************/
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