renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-21 11:44:01 +08:00
Code
3edbf98b86
linux-next/drivers/serial/sc26xx.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

758 lines
16 KiB
C
Raw Blame History

/*
* SC268xx.c: Serial driver for Philiphs SC2681/SC2692 devices.
*
* Copyright (C) 2006,2007 Thomas Bogendörfer (tsbogend@alpha.franken.de)
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/major.h>
#include <linux/circ_buf.h>
#include <linux/serial.h>
#include <linux/sysrq.h>
#include <linux/console.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/irq.h>
#if defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/serial_core.h>
#define SC26XX_MAJOR 204
#define SC26XX_MINOR_START 205
#define SC26XX_NR 2
struct uart_sc26xx_port {
struct uart_port port[2];
u8 dsr_mask[2];
u8 cts_mask[2];
u8 dcd_mask[2];
u8 ri_mask[2];
u8 dtr_mask[2];
u8 rts_mask[2];
u8 imr;
};
/* register common to both ports */
#define RD_ISR 0x14
#define RD_IPR 0x34
#define WR_ACR 0x10
#define WR_IMR 0x14
#define WR_OPCR 0x34
#define WR_OPR_SET 0x38
#define WR_OPR_CLR 0x3C
/* access common register */
#define READ_SC(p, r) readb((p)->membase + RD_##r)
#define WRITE_SC(p, r, v) writeb((v), (p)->membase + WR_##r)
/* register per port */
#define RD_PORT_MRx 0x00
#define RD_PORT_SR 0x04
#define RD_PORT_RHR 0x0c
#define WR_PORT_MRx 0x00
#define WR_PORT_CSR 0x04
#define WR_PORT_CR 0x08
#define WR_PORT_THR 0x0c
/* SR bits */
#define SR_BREAK (1 << 7)
#define SR_FRAME (1 << 6)
#define SR_PARITY (1 << 5)
#define SR_OVERRUN (1 << 4)
#define SR_TXRDY (1 << 2)
#define SR_RXRDY (1 << 0)
#define CR_RES_MR (1 << 4)
#define CR_RES_RX (2 << 4)
#define CR_RES_TX (3 << 4)
#define CR_STRT_BRK (6 << 4)
#define CR_STOP_BRK (7 << 4)
#define CR_DIS_TX (1 << 3)
#define CR_ENA_TX (1 << 2)
#define CR_DIS_RX (1 << 1)
#define CR_ENA_RX (1 << 0)
/* ISR bits */
#define ISR_RXRDYB (1 << 5)
#define ISR_TXRDYB (1 << 4)
#define ISR_RXRDYA (1 << 1)
#define ISR_TXRDYA (1 << 0)
/* IMR bits */
#define IMR_RXRDY (1 << 1)
#define IMR_TXRDY (1 << 0)
/* access port register */
static inline u8 read_sc_port(struct uart_port *p, u8 reg)
{
return readb(p->membase + p->line * 0x20 + reg);
}
static inline void write_sc_port(struct uart_port *p, u8 reg, u8 val)
{
writeb(val, p->membase + p->line * 0x20 + reg);
}
#define READ_SC_PORT(p, r) read_sc_port(p, RD_PORT_##r)
#define WRITE_SC_PORT(p, r, v) write_sc_port(p, WR_PORT_##r, v)
static void sc26xx_enable_irq(struct uart_port *port, int mask)
{
struct uart_sc26xx_port *up;
int line = port->line;
port -= line;
up = container_of(port, struct uart_sc26xx_port, port[0]);
up->imr |= mask << (line * 4);
WRITE_SC(port, IMR, up->imr);
}
static void sc26xx_disable_irq(struct uart_port *port, int mask)
{
struct uart_sc26xx_port *up;
int line = port->line;
port -= line;
up = container_of(port, struct uart_sc26xx_port, port[0]);
up->imr &= ~(mask << (line * 4));
WRITE_SC(port, IMR, up->imr);
}
static struct tty_struct *receive_chars(struct uart_port *port)
{
struct tty_struct *tty = NULL;
int limit = 10000;
unsigned char ch;
char flag;
u8 status;
if (port->info != NULL) /* Unopened serial console */
tty = port->info->tty;
while (limit-- > 0) {
status = READ_SC_PORT(port, SR);
if (!(status & SR_RXRDY))
break;
ch = READ_SC_PORT(port, RHR);
flag = TTY_NORMAL;
port->icount.rx++;
if (unlikely(status & (SR_BREAK | SR_FRAME |
SR_PARITY | SR_OVERRUN))) {
if (status & SR_BREAK) {
status &= ~(SR_PARITY | SR_FRAME);
port->icount.brk++;
if (uart_handle_break(port))
continue;
} else if (status & SR_PARITY)
port->icount.parity++;
else if (status & SR_FRAME)
port->icount.frame++;
if (status & SR_OVERRUN)
port->icount.overrun++;
status &= port->read_status_mask;
if (status & SR_BREAK)
flag = TTY_BREAK;
else if (status & SR_PARITY)
flag = TTY_PARITY;
else if (status & SR_FRAME)
flag = TTY_FRAME;
}
if (uart_handle_sysrq_char(port, ch))
continue;
if (status & port->ignore_status_mask)
continue;
tty_insert_flip_char(tty, ch, flag);
}
return tty;
}
static void transmit_chars(struct uart_port *port)
{
struct circ_buf *xmit;
if (!port->info)
return;
xmit = &port->info->xmit;
if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
sc26xx_disable_irq(port, IMR_TXRDY);
return;
}
while (!uart_circ_empty(xmit)) {
if (!(READ_SC_PORT(port, SR) & SR_TXRDY))
break;
WRITE_SC_PORT(port, THR, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
}
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
}
static irqreturn_t sc26xx_interrupt(int irq, void *dev_id)
{
struct uart_sc26xx_port *up = dev_id;
struct tty_struct *tty;
unsigned long flags;
u8 isr;
spin_lock_irqsave(&up->port[0].lock, flags);
tty = NULL;
isr = READ_SC(&up->port[0], ISR);
if (isr & ISR_TXRDYA)
transmit_chars(&up->port[0]);
if (isr & ISR_RXRDYA)
tty = receive_chars(&up->port[0]);
spin_unlock(&up->port[0].lock);
if (tty)
tty_flip_buffer_push(tty);
spin_lock(&up->port[1].lock);
tty = NULL;
if (isr & ISR_TXRDYB)
transmit_chars(&up->port[1]);
if (isr & ISR_RXRDYB)
tty = receive_chars(&up->port[1]);
spin_unlock_irqrestore(&up->port[1].lock, flags);
if (tty)
tty_flip_buffer_push(tty);
return IRQ_HANDLED;
}
/* port->lock is not held. */
static unsigned int sc26xx_tx_empty(struct uart_port *port)
{
return (READ_SC_PORT(port, SR) & SR_TXRDY) ? TIOCSER_TEMT : 0;
}
/* port->lock held by caller. */
static void sc26xx_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct uart_sc26xx_port *up;
int line = port->line;
port -= line;
up = container_of(port, struct uart_sc26xx_port, port[0]);
if (up->dtr_mask[line]) {
if (mctrl & TIOCM_DTR)
WRITE_SC(port, OPR_SET, up->dtr_mask[line]);
else
WRITE_SC(port, OPR_CLR, up->dtr_mask[line]);
}
if (up->rts_mask[line]) {
if (mctrl & TIOCM_RTS)
WRITE_SC(port, OPR_SET, up->rts_mask[line]);
else
WRITE_SC(port, OPR_CLR, up->rts_mask[line]);
}
}
/* port->lock is held by caller and interrupts are disabled. */
static unsigned int sc26xx_get_mctrl(struct uart_port *port)
{
struct uart_sc26xx_port *up;
int line = port->line;
unsigned int mctrl = TIOCM_DSR | TIOCM_CTS | TIOCM_CAR;
u8 ipr;
port -= line;
up = container_of(port, struct uart_sc26xx_port, port[0]);
ipr = READ_SC(port, IPR) ^ 0xff;
if (up->dsr_mask[line]) {
mctrl &= ~TIOCM_DSR;
mctrl |= ipr & up->dsr_mask[line] ? TIOCM_DSR : 0;
}
if (up->cts_mask[line]) {
mctrl &= ~TIOCM_CTS;
mctrl |= ipr & up->cts_mask[line] ? TIOCM_CTS : 0;
}
if (up->dcd_mask[line]) {
mctrl &= ~TIOCM_CAR;
mctrl |= ipr & up->dcd_mask[line] ? TIOCM_CAR : 0;
}
if (up->ri_mask[line]) {
mctrl &= ~TIOCM_RNG;
mctrl |= ipr & up->ri_mask[line] ? TIOCM_RNG : 0;
}
return mctrl;
}
/* port->lock held by caller. */
static void sc26xx_stop_tx(struct uart_port *port)
{
return;
}
/* port->lock held by caller. */
static void sc26xx_start_tx(struct uart_port *port)
{
struct circ_buf *xmit = &port->info->xmit;
while (!uart_circ_empty(xmit)) {
if (!(READ_SC_PORT(port, SR) & SR_TXRDY)) {
sc26xx_enable_irq(port, IMR_TXRDY);
break;
}
WRITE_SC_PORT(port, THR, xmit->buf[xmit->tail]);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
}
}
/* port->lock held by caller. */
static void sc26xx_stop_rx(struct uart_port *port)
{
}
/* port->lock held by caller. */
static void sc26xx_enable_ms(struct uart_port *port)
{
}
/* port->lock is not held. */
static void sc26xx_break_ctl(struct uart_port *port, int break_state)
{
if (break_state == -1)
WRITE_SC_PORT(port, CR, CR_STRT_BRK);
else
WRITE_SC_PORT(port, CR, CR_STOP_BRK);
}
/* port->lock is not held. */
static int sc26xx_startup(struct uart_port *port)
{
sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
WRITE_SC(port, OPCR, 0);
/* reset tx and rx */
WRITE_SC_PORT(port, CR, CR_RES_RX);
WRITE_SC_PORT(port, CR, CR_RES_TX);
/* start rx/tx */
WRITE_SC_PORT(port, CR, CR_ENA_TX | CR_ENA_RX);
/* enable irqs */
sc26xx_enable_irq(port, IMR_RXRDY);
return 0;
}
/* port->lock is not held. */
static void sc26xx_shutdown(struct uart_port *port)
{
/* disable interrupst */
sc26xx_disable_irq(port, IMR_TXRDY | IMR_RXRDY);
/* stop tx/rx */
WRITE_SC_PORT(port, CR, CR_DIS_TX | CR_DIS_RX);
}
/* port->lock is not held. */
static void sc26xx_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
unsigned int baud = uart_get_baud_rate(port, termios, old, 0, 4000000);
unsigned int quot = uart_get_divisor(port, baud);
unsigned int iflag, cflag;
unsigned long flags;
u8 mr1, mr2, csr;
spin_lock_irqsave(&port->lock, flags);
while ((READ_SC_PORT(port, SR) & ((1 << 3) | (1 << 2))) != 0xc)
udelay(2);
WRITE_SC_PORT(port, CR, CR_DIS_TX | CR_DIS_RX);
iflag = termios->c_iflag;
cflag = termios->c_cflag;
port->read_status_mask = SR_OVERRUN;
if (iflag & INPCK)
port->read_status_mask |= SR_PARITY | SR_FRAME;
if (iflag & (BRKINT | PARMRK))
port->read_status_mask |= SR_BREAK;
port->ignore_status_mask = 0;
if (iflag & IGNBRK)
port->ignore_status_mask |= SR_BREAK;
if ((cflag & CREAD) == 0)
port->ignore_status_mask |= SR_BREAK | SR_FRAME |
SR_PARITY | SR_OVERRUN;
switch (cflag & CSIZE) {
case CS5:
mr1 = 0x00;
break;
case CS6:
mr1 = 0x01;
break;
case CS7:
mr1 = 0x02;
break;
default:
case CS8:
mr1 = 0x03;
break;
}
mr2 = 0x07;
if (cflag & CSTOPB)
mr2 = 0x0f;
if (cflag & PARENB) {
if (cflag & PARODD)
mr1 |= (1 << 2);
} else
mr1 |= (2 << 3);
switch (baud) {
case 50:
csr = 0x00;
break;
case 110:
csr = 0x11;
break;
case 134:
csr = 0x22;
break;
case 200:
csr = 0x33;
break;
case 300:
csr = 0x44;
break;
case 600:
csr = 0x55;
break;
case 1200:
csr = 0x66;
break;
case 2400:
csr = 0x88;
break;
case 4800:
csr = 0x99;
break;
default:
case 9600:
csr = 0xbb;
break;
case 19200:
csr = 0xcc;
break;
}
WRITE_SC_PORT(port, CR, CR_RES_MR);
WRITE_SC_PORT(port, MRx, mr1);
WRITE_SC_PORT(port, MRx, mr2);
WRITE_SC(port, ACR, 0x80);
WRITE_SC_PORT(port, CSR, csr);
/* reset tx and rx */
WRITE_SC_PORT(port, CR, CR_RES_RX);
WRITE_SC_PORT(port, CR, CR_RES_TX);
WRITE_SC_PORT(port, CR, CR_ENA_TX | CR_ENA_RX);
while ((READ_SC_PORT(port, SR) & ((1 << 3) | (1 << 2))) != 0xc)
udelay(2);
/* XXX */
uart_update_timeout(port, cflag,
(port->uartclk / (16 * quot)));
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *sc26xx_type(struct uart_port *port)
{
return "SC26XX";
}
static void sc26xx_release_port(struct uart_port *port)
{
}
static int sc26xx_request_port(struct uart_port *port)
{
return 0;
}
static void sc26xx_config_port(struct uart_port *port, int flags)
{
}
static int sc26xx_verify_port(struct uart_port *port, struct serial_struct *ser)
{
return -EINVAL;
}
static struct uart_ops sc26xx_ops = {
.tx_empty = sc26xx_tx_empty,
.set_mctrl = sc26xx_set_mctrl,
.get_mctrl = sc26xx_get_mctrl,
.stop_tx = sc26xx_stop_tx,
.start_tx = sc26xx_start_tx,
.stop_rx = sc26xx_stop_rx,
.enable_ms = sc26xx_enable_ms,
.break_ctl = sc26xx_break_ctl,
.startup = sc26xx_startup,
.shutdown = sc26xx_shutdown,
.set_termios = sc26xx_set_termios,
.type = sc26xx_type,
.release_port = sc26xx_release_port,
.request_port = sc26xx_request_port,
.config_port = sc26xx_config_port,
.verify_port = sc26xx_verify_port,
};
static struct uart_port *sc26xx_port;
#ifdef CONFIG_SERIAL_SC26XX_CONSOLE
static void sc26xx_console_putchar(struct uart_port *port, char c)
{
unsigned long flags;
int limit = 1000000;
spin_lock_irqsave(&port->lock, flags);
while (limit-- > 0) {
if (READ_SC_PORT(port, SR) & SR_TXRDY) {
WRITE_SC_PORT(port, THR, c);
break;
}
udelay(2);
}
spin_unlock_irqrestore(&port->lock, flags);
}
static void sc26xx_console_write(struct console *con, const char *s, unsigned n)
{
struct uart_port *port = sc26xx_port;
int i;
for (i = 0; i < n; i++) {
if (*s == '\n')
sc26xx_console_putchar(port, '\r');
sc26xx_console_putchar(port, *s++);
}
}
static int __init sc26xx_console_setup(struct console *con, char *options)
{
struct uart_port *port = sc26xx_port;
int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
if (port->type != PORT_SC26XX)
return -1;
printk(KERN_INFO "Console: ttySC%d (SC26XX)\n", con->index);
if (options)
uart_parse_options(options, &baud, &parity, &bits, &flow);
return uart_set_options(port, con, baud, parity, bits, flow);
}
static struct uart_driver sc26xx_reg;
static struct console sc26xx_console = {
.name = "ttySC",
.write = sc26xx_console_write,
.device = uart_console_device,
.setup = sc26xx_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &sc26xx_reg,
};
#define SC26XX_CONSOLE &sc26xx_console
#else
#define SC26XX_CONSOLE NULL
#endif
static struct uart_driver sc26xx_reg = {
.owner = THIS_MODULE,
.driver_name = "SC26xx",
.dev_name = "ttySC",
.major = SC26XX_MAJOR,
.minor = SC26XX_MINOR_START,
.nr = SC26XX_NR,
.cons = SC26XX_CONSOLE,
};
static u8 sc26xx_flags2mask(unsigned int flags, unsigned int bitpos)
{
unsigned int bit = (flags >> bitpos) & 15;
return bit ? (1 << (bit - 1)) : 0;
}
static void __devinit sc26xx_init_masks(struct uart_sc26xx_port *up,
int line, unsigned int data)
{
up->dtr_mask[line] = sc26xx_flags2mask(data, 0);
up->rts_mask[line] = sc26xx_flags2mask(data, 4);
up->dsr_mask[line] = sc26xx_flags2mask(data, 8);
up->cts_mask[line] = sc26xx_flags2mask(data, 12);
up->dcd_mask[line] = sc26xx_flags2mask(data, 16);
up->ri_mask[line] = sc26xx_flags2mask(data, 20);
}
static int __devinit sc26xx_probe(struct platform_device *dev)
{
struct resource *res;
struct uart_sc26xx_port *up;
unsigned int *sc26xx_data = dev->dev.platform_data;
int err;
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
up = kzalloc(sizeof *up, GFP_KERNEL);
if (unlikely(!up))
return -ENOMEM;
up->port[0].line = 0;
up->port[0].ops = &sc26xx_ops;
up->port[0].type = PORT_SC26XX;
up->port[0].uartclk = (29491200 / 16); /* arbitrary */
up->port[0].mapbase = res->start;
up->port[0].membase = ioremap_nocache(up->port[0].mapbase, 0x40);
up->port[0].iotype = UPIO_MEM;
up->port[0].irq = platform_get_irq(dev, 0);
up->port[0].dev = &dev->dev;
sc26xx_init_masks(up, 0, sc26xx_data[0]);
sc26xx_port = &up->port[0];
up->port[1].line = 1;
up->port[1].ops = &sc26xx_ops;
up->port[1].type = PORT_SC26XX;
up->port[1].uartclk = (29491200 / 16); /* arbitrary */
up->port[1].mapbase = up->port[0].mapbase;
up->port[1].membase = up->port[0].membase;
up->port[1].iotype = UPIO_MEM;
up->port[1].irq = up->port[0].irq;
up->port[1].dev = &dev->dev;
sc26xx_init_masks(up, 1, sc26xx_data[1]);
err = uart_register_driver(&sc26xx_reg);
if (err)
goto out_free_port;
sc26xx_reg.tty_driver->name_base = sc26xx_reg.minor;
err = uart_add_one_port(&sc26xx_reg, &up->port[0]);
if (err)
goto out_unregister_driver;
err = uart_add_one_port(&sc26xx_reg, &up->port[1]);
if (err)
goto out_remove_port0;
err = request_irq(up->port[0].irq, sc26xx_interrupt, 0, "sc26xx", up);
if (err)
goto out_remove_ports;
dev_set_drvdata(&dev->dev, up);
return 0;
out_remove_ports:
uart_remove_one_port(&sc26xx_reg, &up->port[1]);
out_remove_port0:
uart_remove_one_port(&sc26xx_reg, &up->port[0]);
out_unregister_driver:
uart_unregister_driver(&sc26xx_reg);
out_free_port:
kfree(up);
sc26xx_port = NULL;
return err;
}
static int __exit sc26xx_driver_remove(struct platform_device *dev)
{
struct uart_sc26xx_port *up = dev_get_drvdata(&dev->dev);
free_irq(up->port[0].irq, up);
uart_remove_one_port(&sc26xx_reg, &up->port[0]);
uart_remove_one_port(&sc26xx_reg, &up->port[1]);
uart_unregister_driver(&sc26xx_reg);
kfree(up);
sc26xx_port = NULL;
dev_set_drvdata(&dev->dev, NULL);
return 0;
}
static struct platform_driver sc26xx_driver = {
.probe = sc26xx_probe,
.remove = __devexit_p(sc26xx_driver_remove),
.driver = {
.name = "SC26xx",
.owner = THIS_MODULE,
},
};
static int __init sc26xx_init(void)
{
return platform_driver_register(&sc26xx_driver);
}
static void __exit sc26xx_exit(void)
{
platform_driver_unregister(&sc26xx_driver);
}
module_init(sc26xx_init);
module_exit(sc26xx_exit);
MODULE_AUTHOR("Thomas Bogendörfer");
MODULE_DESCRIPTION("SC681/SC2692 serial driver");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:SC26xx");
View Git Blame Copy Permalink