linux/drivers/serial/uartlite.c
Alan Cox 606d099cdd [PATCH] tty: switch to ktermios
This is the grungy swap all the occurrences in the right places patch that
goes with the updates.  At this point we have the same functionality as
before (except that sgttyb() returns speeds not zero) and are ready to
begin turning new stuff on providing nobody reports lots of bugs

If you are a tty driver author converting an out of tree driver the only
impact should be termios->ktermios name changes for the speed/property
setting functions from your upper layers.

If you are implementing your own TCGETS function before then your driver
was broken already and its about to get a whole lot more painful for you so
please fix it 8)

Also fill in c_ispeed/ospeed on init for most devices, although the current
code will do this for you anyway but I'd like eventually to lose that extra
paranoia

[akpm@osdl.org: bluetooth fix]
[mp3@de.ibm.com: sclp fix]
[mp3@de.ibm.com: warning fix for tty3270]
[hugh@veritas.com: fix tty_ioctl powerpc build]
[jdike@addtoit.com: uml: fix ->set_termios declaration]
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Martin Peschke <mp3@de.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@de.ibm.com>
Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-12-08 08:28:57 -08:00

506 lines
11 KiB
C

/*
* uartlite.c: Serial driver for Xilinx uartlite serial controller
*
* Peter Korsgaard <jacmet@sunsite.dk>
*
* 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.
*/
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/console.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#define ULITE_MAJOR 204
#define ULITE_MINOR 187
#define ULITE_NR_UARTS 4
/* For register details see datasheet:
http://www.xilinx.com/bvdocs/ipcenter/data_sheet/opb_uartlite.pdf
*/
#define ULITE_RX 0x00
#define ULITE_TX 0x04
#define ULITE_STATUS 0x08
#define ULITE_CONTROL 0x0c
#define ULITE_REGION 16
#define ULITE_STATUS_RXVALID 0x01
#define ULITE_STATUS_RXFULL 0x02
#define ULITE_STATUS_TXEMPTY 0x04
#define ULITE_STATUS_TXFULL 0x08
#define ULITE_STATUS_IE 0x10
#define ULITE_STATUS_OVERRUN 0x20
#define ULITE_STATUS_FRAME 0x40
#define ULITE_STATUS_PARITY 0x80
#define ULITE_CONTROL_RST_TX 0x01
#define ULITE_CONTROL_RST_RX 0x02
#define ULITE_CONTROL_IE 0x10
static struct uart_port ports[ULITE_NR_UARTS];
static int ulite_receive(struct uart_port *port, int stat)
{
struct tty_struct *tty = port->info->tty;
unsigned char ch = 0;
char flag = TTY_NORMAL;
if ((stat & (ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN
| ULITE_STATUS_FRAME)) == 0)
return 0;
/* stats */
if (stat & ULITE_STATUS_RXVALID) {
port->icount.rx++;
ch = readb(port->membase + ULITE_RX);
if (stat & ULITE_STATUS_PARITY)
port->icount.parity++;
}
if (stat & ULITE_STATUS_OVERRUN)
port->icount.overrun++;
if (stat & ULITE_STATUS_FRAME)
port->icount.frame++;
/* drop byte with parity error if IGNPAR specificed */
if (stat & port->ignore_status_mask & ULITE_STATUS_PARITY)
stat &= ~ULITE_STATUS_RXVALID;
stat &= port->read_status_mask;
if (stat & ULITE_STATUS_PARITY)
flag = TTY_PARITY;
stat &= ~port->ignore_status_mask;
if (stat & ULITE_STATUS_RXVALID)
tty_insert_flip_char(tty, ch, flag);
if (stat & ULITE_STATUS_FRAME)
tty_insert_flip_char(tty, 0, TTY_FRAME);
if (stat & ULITE_STATUS_OVERRUN)
tty_insert_flip_char(tty, 0, TTY_OVERRUN);
return 1;
}
static int ulite_transmit(struct uart_port *port, int stat)
{
struct circ_buf *xmit = &port->info->xmit;
if (stat & ULITE_STATUS_TXFULL)
return 0;
if (port->x_char) {
writeb(port->x_char, port->membase + ULITE_TX);
port->x_char = 0;
port->icount.tx++;
return 1;
}
if (uart_circ_empty(xmit) || uart_tx_stopped(port))
return 0;
writeb(xmit->buf[xmit->tail], port->membase + ULITE_TX);
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE-1);
port->icount.tx++;
/* wake up */
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
return 1;
}
static irqreturn_t ulite_isr(int irq, void *dev_id)
{
struct uart_port *port = (struct uart_port *)dev_id;
int busy;
do {
int stat = readb(port->membase + ULITE_STATUS);
busy = ulite_receive(port, stat);
busy |= ulite_transmit(port, stat);
} while (busy);
tty_flip_buffer_push(port->info->tty);
return IRQ_HANDLED;
}
static unsigned int ulite_tx_empty(struct uart_port *port)
{
unsigned long flags;
unsigned int ret;
spin_lock_irqsave(&port->lock, flags);
ret = readb(port->membase + ULITE_STATUS);
spin_unlock_irqrestore(&port->lock, flags);
return ret & ULITE_STATUS_TXEMPTY ? TIOCSER_TEMT : 0;
}
static unsigned int ulite_get_mctrl(struct uart_port *port)
{
return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
}
static void ulite_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
/* N/A */
}
static void ulite_stop_tx(struct uart_port *port)
{
/* N/A */
}
static void ulite_start_tx(struct uart_port *port)
{
ulite_transmit(port, readb(port->membase + ULITE_STATUS));
}
static void ulite_stop_rx(struct uart_port *port)
{
/* don't forward any more data (like !CREAD) */
port->ignore_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY
| ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
}
static void ulite_enable_ms(struct uart_port *port)
{
/* N/A */
}
static void ulite_break_ctl(struct uart_port *port, int ctl)
{
/* N/A */
}
static int ulite_startup(struct uart_port *port)
{
int ret;
ret = request_irq(port->irq, ulite_isr,
IRQF_DISABLED | IRQF_SAMPLE_RANDOM, "uartlite", port);
if (ret)
return ret;
writeb(ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX,
port->membase + ULITE_CONTROL);
writeb(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
return 0;
}
static void ulite_shutdown(struct uart_port *port)
{
writeb(0, port->membase + ULITE_CONTROL);
readb(port->membase + ULITE_CONTROL); /* dummy */
free_irq(port->irq, port);
}
static void ulite_set_termios(struct uart_port *port, struct ktermios *termios,
struct ktermios *old)
{
unsigned long flags;
unsigned int baud;
spin_lock_irqsave(&port->lock, flags);
port->read_status_mask = ULITE_STATUS_RXVALID | ULITE_STATUS_OVERRUN
| ULITE_STATUS_TXFULL;
if (termios->c_iflag & INPCK)
port->read_status_mask |=
ULITE_STATUS_PARITY | ULITE_STATUS_FRAME;
port->ignore_status_mask = 0;
if (termios->c_iflag & IGNPAR)
port->ignore_status_mask |= ULITE_STATUS_PARITY
| ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
/* ignore all characters if CREAD is not set */
if ((termios->c_cflag & CREAD) == 0)
port->ignore_status_mask |=
ULITE_STATUS_RXVALID | ULITE_STATUS_PARITY
| ULITE_STATUS_FRAME | ULITE_STATUS_OVERRUN;
/* update timeout */
baud = uart_get_baud_rate(port, termios, old, 0, 460800);
uart_update_timeout(port, termios->c_cflag, baud);
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *ulite_type(struct uart_port *port)
{
return port->type == PORT_UARTLITE ? "uartlite" : NULL;
}
static void ulite_release_port(struct uart_port *port)
{
release_mem_region(port->mapbase, ULITE_REGION);
iounmap(port->membase);
port->membase = 0;
}
static int ulite_request_port(struct uart_port *port)
{
if (!request_mem_region(port->mapbase, ULITE_REGION, "uartlite")) {
dev_err(port->dev, "Memory region busy\n");
return -EBUSY;
}
port->membase = ioremap(port->mapbase, ULITE_REGION);
if (!port->membase) {
dev_err(port->dev, "Unable to map registers\n");
release_mem_region(port->mapbase, ULITE_REGION);
return -EBUSY;
}
return 0;
}
static void ulite_config_port(struct uart_port *port, int flags)
{
ulite_request_port(port);
port->type = PORT_UARTLITE;
}
static int ulite_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 struct uart_ops ulite_ops = {
.tx_empty = ulite_tx_empty,
.set_mctrl = ulite_set_mctrl,
.get_mctrl = ulite_get_mctrl,
.stop_tx = ulite_stop_tx,
.start_tx = ulite_start_tx,
.stop_rx = ulite_stop_rx,
.enable_ms = ulite_enable_ms,
.break_ctl = ulite_break_ctl,
.startup = ulite_startup,
.shutdown = ulite_shutdown,
.set_termios = ulite_set_termios,
.type = ulite_type,
.release_port = ulite_release_port,
.request_port = ulite_request_port,
.config_port = ulite_config_port,
.verify_port = ulite_verify_port
};
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
static void ulite_console_wait_tx(struct uart_port *port)
{
int i;
/* wait up to 10ms for the character(s) to be sent */
for (i = 0; i < 10000; i++) {
if (readb(port->membase + ULITE_STATUS) & ULITE_STATUS_TXEMPTY)
break;
udelay(1);
}
}
static void ulite_console_putchar(struct uart_port *port, int ch)
{
ulite_console_wait_tx(port);
writeb(ch, port->membase + ULITE_TX);
}
static void ulite_console_write(struct console *co, const char *s,
unsigned int count)
{
struct uart_port *port = &ports[co->index];
unsigned long flags;
unsigned int ier;
int locked = 1;
if (oops_in_progress) {
locked = spin_trylock_irqsave(&port->lock, flags);
} else
spin_lock_irqsave(&port->lock, flags);
/* save and disable interrupt */
ier = readb(port->membase + ULITE_STATUS) & ULITE_STATUS_IE;
writeb(0, port->membase + ULITE_CONTROL);
uart_console_write(port, s, count, ulite_console_putchar);
ulite_console_wait_tx(port);
/* restore interrupt state */
if (ier)
writeb(ULITE_CONTROL_IE, port->membase + ULITE_CONTROL);
if (locked)
spin_unlock_irqrestore(&port->lock, flags);
}
static int __init ulite_console_setup(struct console *co, char *options)
{
struct uart_port *port;
int baud = 9600;
int bits = 8;
int parity = 'n';
int flow = 'n';
if (co->index < 0 || co->index >= ULITE_NR_UARTS)
return -EINVAL;
port = &ports[co->index];
/* not initialized yet? */
if (!port->membase)
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 ulite_uart_driver;
static struct console ulite_console = {
.name = "ttyUL",
.write = ulite_console_write,
.device = uart_console_device,
.setup = ulite_console_setup,
.flags = CON_PRINTBUFFER,
.index = -1, /* Specified on the cmdline (e.g. console=ttyUL0 ) */
.data = &ulite_uart_driver,
};
static int __init ulite_console_init(void)
{
register_console(&ulite_console);
return 0;
}
console_initcall(ulite_console_init);
#endif /* CONFIG_SERIAL_UARTLITE_CONSOLE */
static struct uart_driver ulite_uart_driver = {
.owner = THIS_MODULE,
.driver_name = "uartlite",
.dev_name = "ttyUL",
.major = ULITE_MAJOR,
.minor = ULITE_MINOR,
.nr = ULITE_NR_UARTS,
#ifdef CONFIG_SERIAL_UARTLITE_CONSOLE
.cons = &ulite_console,
#endif
};
static int __devinit ulite_probe(struct platform_device *pdev)
{
struct resource *res, *res2;
struct uart_port *port;
if (pdev->id < 0 || pdev->id >= ULITE_NR_UARTS)
return -EINVAL;
if (ports[pdev->id].membase)
return -EBUSY;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -ENODEV;
res2 = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (!res2)
return -ENODEV;
port = &ports[pdev->id];
port->fifosize = 16;
port->regshift = 2;
port->iotype = UPIO_MEM;
port->iobase = 1; /* mark port in use */
port->mapbase = res->start;
port->membase = 0;
port->ops = &ulite_ops;
port->irq = res2->start;
port->flags = UPF_BOOT_AUTOCONF;
port->dev = &pdev->dev;
port->type = PORT_UNKNOWN;
port->line = pdev->id;
uart_add_one_port(&ulite_uart_driver, port);
platform_set_drvdata(pdev, port);
return 0;
}
static int ulite_remove(struct platform_device *pdev)
{
struct uart_port *port = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
if (port)
uart_remove_one_port(&ulite_uart_driver, port);
/* mark port as free */
port->membase = 0;
return 0;
}
static struct platform_driver ulite_platform_driver = {
.probe = ulite_probe,
.remove = ulite_remove,
.driver = {
.owner = THIS_MODULE,
.name = "uartlite",
},
};
int __init ulite_init(void)
{
int ret;
ret = uart_register_driver(&ulite_uart_driver);
if (ret)
return ret;
ret = platform_driver_register(&ulite_platform_driver);
if (ret)
uart_unregister_driver(&ulite_uart_driver);
return ret;
}
void __exit ulite_exit(void)
{
platform_driver_unregister(&ulite_platform_driver);
uart_unregister_driver(&ulite_uart_driver);
}
module_init(ulite_init);
module_exit(ulite_exit);
MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
MODULE_DESCRIPTION("Xilinx uartlite serial driver");
MODULE_LICENSE("GPL");