kernel-ark/drivers/serial/sunhv.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

527 lines
10 KiB
C

/* sunhv.c: Serial driver for SUN4V hypervisor console.
*
* Copyright (C) 2006 David S. Miller (davem@davemloft.net)
*/
#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 <asm/hypervisor.h>
#include <asm/spitfire.h>
#include <asm/prom.h>
#include <asm/of_device.h>
#include <asm/irq.h>
#if defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/serial_core.h>
#include "suncore.h"
#define CON_BREAK ((long)-1)
#define CON_HUP ((long)-2)
static inline long hypervisor_con_getchar(long *status)
{
register unsigned long func asm("%o5");
register unsigned long arg0 asm("%o0");
register unsigned long arg1 asm("%o1");
func = HV_FAST_CONS_GETCHAR;
arg0 = 0;
arg1 = 0;
__asm__ __volatile__("ta %6"
: "=&r" (func), "=&r" (arg0), "=&r" (arg1)
: "0" (func), "1" (arg0), "2" (arg1),
"i" (HV_FAST_TRAP));
*status = arg0;
return (long) arg1;
}
static inline long hypervisor_con_putchar(long ch)
{
register unsigned long func asm("%o5");
register unsigned long arg0 asm("%o0");
func = HV_FAST_CONS_PUTCHAR;
arg0 = ch;
__asm__ __volatile__("ta %4"
: "=&r" (func), "=&r" (arg0)
: "0" (func), "1" (arg0), "i" (HV_FAST_TRAP));
return (long) arg0;
}
#define IGNORE_BREAK 0x1
#define IGNORE_ALL 0x2
static int hung_up = 0;
static struct tty_struct *receive_chars(struct uart_port *port)
{
struct tty_struct *tty = NULL;
int saw_console_brk = 0;
int limit = 10000;
if (port->info != NULL) /* Unopened serial console */
tty = port->info->tty;
while (limit-- > 0) {
long status;
long c = hypervisor_con_getchar(&status);
unsigned char flag;
if (status == HV_EWOULDBLOCK)
break;
if (c == CON_BREAK) {
if (uart_handle_break(port))
continue;
saw_console_brk = 1;
c = 0;
}
if (c == CON_HUP) {
hung_up = 1;
uart_handle_dcd_change(port, 0);
} else if (hung_up) {
hung_up = 0;
uart_handle_dcd_change(port, 1);
}
if (tty == NULL) {
uart_handle_sysrq_char(port, c);
continue;
}
flag = TTY_NORMAL;
port->icount.rx++;
if (c == CON_BREAK) {
port->icount.brk++;
if (uart_handle_break(port))
continue;
flag = TTY_BREAK;
}
if (uart_handle_sysrq_char(port, c))
continue;
if ((port->ignore_status_mask & IGNORE_ALL) ||
((port->ignore_status_mask & IGNORE_BREAK) &&
(c == CON_BREAK)))
continue;
tty_insert_flip_char(tty, c, flag);
}
if (saw_console_brk)
sun_do_break();
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))
return;
while (!uart_circ_empty(xmit)) {
long status = hypervisor_con_putchar(xmit->buf[xmit->tail]);
if (status != HV_EOK)
break;
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 sunhv_interrupt(int irq, void *dev_id)
{
struct uart_port *port = dev_id;
struct tty_struct *tty;
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
tty = receive_chars(port);
transmit_chars(port);
spin_unlock_irqrestore(&port->lock, flags);
if (tty)
tty_flip_buffer_push(tty);
return IRQ_HANDLED;
}
/* port->lock is not held. */
static unsigned int sunhv_tx_empty(struct uart_port *port)
{
/* Transmitter is always empty for us. If the circ buffer
* is non-empty or there is an x_char pending, our caller
* will do the right thing and ignore what we return here.
*/
return TIOCSER_TEMT;
}
/* port->lock held by caller. */
static void sunhv_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
return;
}
/* port->lock is held by caller and interrupts are disabled. */
static unsigned int sunhv_get_mctrl(struct uart_port *port)
{
return TIOCM_DSR | TIOCM_CAR | TIOCM_CTS;
}
/* port->lock held by caller. */
static void sunhv_stop_tx(struct uart_port *port)
{
return;
}
/* port->lock held by caller. */
static void sunhv_start_tx(struct uart_port *port)
{
struct circ_buf *xmit = &port->info->xmit;
while (!uart_circ_empty(xmit)) {
long status = hypervisor_con_putchar(xmit->buf[xmit->tail]);
if (status != HV_EOK)
break;
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
}
}
/* port->lock is not held. */
static void sunhv_send_xchar(struct uart_port *port, char ch)
{
unsigned long flags;
int limit = 10000;
spin_lock_irqsave(&port->lock, flags);
while (limit-- > 0) {
long status = hypervisor_con_putchar(ch);
if (status == HV_EOK)
break;
}
spin_unlock_irqrestore(&port->lock, flags);
}
/* port->lock held by caller. */
static void sunhv_stop_rx(struct uart_port *port)
{
}
/* port->lock held by caller. */
static void sunhv_enable_ms(struct uart_port *port)
{
}
/* port->lock is not held. */
static void sunhv_break_ctl(struct uart_port *port, int break_state)
{
if (break_state) {
unsigned long flags;
int limit = 1000000;
spin_lock_irqsave(&port->lock, flags);
while (limit-- > 0) {
long status = hypervisor_con_putchar(CON_BREAK);
if (status == HV_EOK)
break;
udelay(2);
}
spin_unlock_irqrestore(&port->lock, flags);
}
}
/* port->lock is not held. */
static int sunhv_startup(struct uart_port *port)
{
return 0;
}
/* port->lock is not held. */
static void sunhv_shutdown(struct uart_port *port)
{
}
/* port->lock is not held. */
static void sunhv_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;
spin_lock_irqsave(&port->lock, flags);
iflag = termios->c_iflag;
cflag = termios->c_cflag;
port->ignore_status_mask = 0;
if (iflag & IGNBRK)
port->ignore_status_mask |= IGNORE_BREAK;
if ((cflag & CREAD) == 0)
port->ignore_status_mask |= IGNORE_ALL;
/* XXX */
uart_update_timeout(port, cflag,
(port->uartclk / (16 * quot)));
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *sunhv_type(struct uart_port *port)
{
return "SUN4V HCONS";
}
static void sunhv_release_port(struct uart_port *port)
{
}
static int sunhv_request_port(struct uart_port *port)
{
return 0;
}
static void sunhv_config_port(struct uart_port *port, int flags)
{
}
static int sunhv_verify_port(struct uart_port *port, struct serial_struct *ser)
{
return -EINVAL;
}
static struct uart_ops sunhv_pops = {
.tx_empty = sunhv_tx_empty,
.set_mctrl = sunhv_set_mctrl,
.get_mctrl = sunhv_get_mctrl,
.stop_tx = sunhv_stop_tx,
.start_tx = sunhv_start_tx,
.send_xchar = sunhv_send_xchar,
.stop_rx = sunhv_stop_rx,
.enable_ms = sunhv_enable_ms,
.break_ctl = sunhv_break_ctl,
.startup = sunhv_startup,
.shutdown = sunhv_shutdown,
.set_termios = sunhv_set_termios,
.type = sunhv_type,
.release_port = sunhv_release_port,
.request_port = sunhv_request_port,
.config_port = sunhv_config_port,
.verify_port = sunhv_verify_port,
};
static struct uart_driver sunhv_reg = {
.owner = THIS_MODULE,
.driver_name = "serial",
.dev_name = "ttyS",
.major = TTY_MAJOR,
};
static struct uart_port *sunhv_port;
static inline void sunhv_console_putchar(struct uart_port *port, char c)
{
unsigned long flags;
int limit = 1000000;
spin_lock_irqsave(&port->lock, flags);
while (limit-- > 0) {
long status = hypervisor_con_putchar(c);
if (status == HV_EOK)
break;
udelay(2);
}
spin_unlock_irqrestore(&port->lock, flags);
}
static void sunhv_console_write(struct console *con, const char *s, unsigned n)
{
struct uart_port *port = sunhv_port;
int i;
for (i = 0; i < n; i++) {
if (*s == '\n')
sunhv_console_putchar(port, '\r');
sunhv_console_putchar(port, *s++);
}
}
static struct console sunhv_console = {
.name = "ttyHV",
.write = sunhv_console_write,
.device = uart_console_device,
.flags = CON_PRINTBUFFER,
.index = -1,
.data = &sunhv_reg,
};
static inline struct console *SUNHV_CONSOLE(void)
{
if (con_is_present())
return NULL;
sunhv_console.index = 0;
return &sunhv_console;
}
static int __devinit hv_probe(struct of_device *op, const struct of_device_id *match)
{
struct uart_port *port;
int err;
if (op->irqs[0] == 0xffffffff)
return -ENODEV;
port = kzalloc(sizeof(struct uart_port), GFP_KERNEL);
if (unlikely(!port))
return -ENOMEM;
sunhv_port = port;
port->line = 0;
port->ops = &sunhv_pops;
port->type = PORT_SUNHV;
port->uartclk = ( 29491200 / 16 ); /* arbitrary */
port->membase = (unsigned char __iomem *) __pa(port);
port->irq = op->irqs[0];
port->dev = &op->dev;
sunhv_reg.minor = sunserial_current_minor;
sunhv_reg.nr = 1;
err = uart_register_driver(&sunhv_reg);
if (err)
goto out_free_port;
sunhv_reg.tty_driver->name_base = sunhv_reg.minor - 64;
sunserial_current_minor += 1;
sunhv_reg.cons = SUNHV_CONSOLE();
err = uart_add_one_port(&sunhv_reg, port);
if (err)
goto out_unregister_driver;
err = request_irq(port->irq, sunhv_interrupt, 0, "hvcons", port);
if (err)
goto out_remove_port;
dev_set_drvdata(&op->dev, port);
return 0;
out_remove_port:
uart_remove_one_port(&sunhv_reg, port);
out_unregister_driver:
sunserial_current_minor -= 1;
uart_unregister_driver(&sunhv_reg);
out_free_port:
kfree(port);
sunhv_port = NULL;
return err;
}
static int __devexit hv_remove(struct of_device *dev)
{
struct uart_port *port = dev_get_drvdata(&dev->dev);
free_irq(port->irq, port);
uart_remove_one_port(&sunhv_reg, port);
sunserial_current_minor -= 1;
uart_unregister_driver(&sunhv_reg);
kfree(port);
sunhv_port = NULL;
dev_set_drvdata(&dev->dev, NULL);
return 0;
}
static struct of_device_id hv_match[] = {
{
.name = "console",
.compatible = "qcn",
},
{},
};
MODULE_DEVICE_TABLE(of, hv_match);
static struct of_platform_driver hv_driver = {
.name = "hv",
.match_table = hv_match,
.probe = hv_probe,
.remove = __devexit_p(hv_remove),
};
static int __init sunhv_init(void)
{
if (tlb_type != hypervisor)
return -ENODEV;
return of_register_driver(&hv_driver, &of_bus_type);
}
static void __exit sunhv_exit(void)
{
of_unregister_driver(&hv_driver);
}
module_init(sunhv_init);
module_exit(sunhv_exit);
MODULE_AUTHOR("David S. Miller");
MODULE_DESCRIPTION("SUN4V Hypervisor console driver");
MODULE_VERSION("2.0");
MODULE_LICENSE("GPL");