677 lines
14 KiB
C
677 lines
14 KiB
C
/* sunhv.c: Serial driver for SUN4V hypervisor console.
|
|
*
|
|
* Copyright (C) 2006, 2007 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)
|
|
|
|
#define IGNORE_BREAK 0x1
|
|
#define IGNORE_ALL 0x2
|
|
|
|
static char *con_write_page;
|
|
static char *con_read_page;
|
|
|
|
static int hung_up = 0;
|
|
|
|
static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit)
|
|
{
|
|
while (!uart_circ_empty(xmit)) {
|
|
long status = sun4v_con_putchar(xmit->buf[xmit->tail]);
|
|
|
|
if (status != HV_EOK)
|
|
break;
|
|
|
|
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
|
|
port->icount.tx++;
|
|
}
|
|
}
|
|
|
|
static void transmit_chars_write(struct uart_port *port, struct circ_buf *xmit)
|
|
{
|
|
while (!uart_circ_empty(xmit)) {
|
|
unsigned long ra = __pa(xmit->buf + xmit->tail);
|
|
unsigned long len, status, sent;
|
|
|
|
len = CIRC_CNT_TO_END(xmit->head, xmit->tail,
|
|
UART_XMIT_SIZE);
|
|
status = sun4v_con_write(ra, len, &sent);
|
|
if (status != HV_EOK)
|
|
break;
|
|
xmit->tail = (xmit->tail + sent) & (UART_XMIT_SIZE - 1);
|
|
port->icount.tx += sent;
|
|
}
|
|
}
|
|
|
|
static int receive_chars_getchar(struct uart_port *port, struct tty_struct *tty)
|
|
{
|
|
int saw_console_brk = 0;
|
|
int limit = 10000;
|
|
|
|
while (limit-- > 0) {
|
|
long status;
|
|
long c = sun4v_con_getchar(&status);
|
|
|
|
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;
|
|
}
|
|
|
|
port->icount.rx++;
|
|
|
|
if (uart_handle_sysrq_char(port, c))
|
|
continue;
|
|
|
|
tty_insert_flip_char(tty, c, TTY_NORMAL);
|
|
}
|
|
|
|
return saw_console_brk;
|
|
}
|
|
|
|
static int receive_chars_read(struct uart_port *port, struct tty_struct *tty)
|
|
{
|
|
int saw_console_brk = 0;
|
|
int limit = 10000;
|
|
|
|
while (limit-- > 0) {
|
|
unsigned long ra = __pa(con_read_page);
|
|
unsigned long bytes_read, i;
|
|
long stat = sun4v_con_read(ra, PAGE_SIZE, &bytes_read);
|
|
|
|
if (stat != HV_EOK) {
|
|
bytes_read = 0;
|
|
|
|
if (stat == CON_BREAK) {
|
|
if (uart_handle_break(port))
|
|
continue;
|
|
saw_console_brk = 1;
|
|
*con_read_page = 0;
|
|
bytes_read = 1;
|
|
} else if (stat == CON_HUP) {
|
|
hung_up = 1;
|
|
uart_handle_dcd_change(port, 0);
|
|
continue;
|
|
} else {
|
|
/* HV_EWOULDBLOCK, etc. */
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (hung_up) {
|
|
hung_up = 0;
|
|
uart_handle_dcd_change(port, 1);
|
|
}
|
|
|
|
for (i = 0; i < bytes_read; i++)
|
|
uart_handle_sysrq_char(port, con_read_page[i]);
|
|
|
|
if (tty == NULL)
|
|
continue;
|
|
|
|
port->icount.rx += bytes_read;
|
|
|
|
tty_insert_flip_string(tty, con_read_page, bytes_read);
|
|
}
|
|
|
|
return saw_console_brk;
|
|
}
|
|
|
|
struct sunhv_ops {
|
|
void (*transmit_chars)(struct uart_port *port, struct circ_buf *xmit);
|
|
int (*receive_chars)(struct uart_port *port, struct tty_struct *tty);
|
|
};
|
|
|
|
static struct sunhv_ops bychar_ops = {
|
|
.transmit_chars = transmit_chars_putchar,
|
|
.receive_chars = receive_chars_getchar,
|
|
};
|
|
|
|
static struct sunhv_ops bywrite_ops = {
|
|
.transmit_chars = transmit_chars_write,
|
|
.receive_chars = receive_chars_read,
|
|
};
|
|
|
|
static struct sunhv_ops *sunhv_ops = &bychar_ops;
|
|
|
|
static struct tty_struct *receive_chars(struct uart_port *port)
|
|
{
|
|
struct tty_struct *tty = NULL;
|
|
|
|
if (port->info != NULL) /* Unopened serial console */
|
|
tty = port->info->tty;
|
|
|
|
if (sunhv_ops->receive_chars(port, tty))
|
|
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;
|
|
|
|
sunhv_ops->transmit_chars(port, xmit);
|
|
|
|
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)
|
|
{
|
|
transmit_chars(port);
|
|
}
|
|
|
|
/* 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 = sun4v_con_putchar(ch);
|
|
if (status == HV_EOK)
|
|
break;
|
|
udelay(1);
|
|
}
|
|
|
|
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 = 10000;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
while (limit-- > 0) {
|
|
long status = sun4v_con_putchar(CON_BREAK);
|
|
if (status == HV_EOK)
|
|
break;
|
|
udelay(1);
|
|
}
|
|
|
|
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;
|
|
|
|
/* Copy 's' into the con_write_page, decoding "\n" into
|
|
* "\r\n" along the way. We have to return two lengths
|
|
* because the caller needs to know how much to advance
|
|
* 's' and also how many bytes to output via con_write_page.
|
|
*/
|
|
static int fill_con_write_page(const char *s, unsigned int n,
|
|
unsigned long *page_bytes)
|
|
{
|
|
const char *orig_s = s;
|
|
char *p = con_write_page;
|
|
int left = PAGE_SIZE;
|
|
|
|
while (n--) {
|
|
if (*s == '\n') {
|
|
if (left < 2)
|
|
break;
|
|
*p++ = '\r';
|
|
left--;
|
|
} else if (left < 1)
|
|
break;
|
|
*p++ = *s++;
|
|
left--;
|
|
}
|
|
*page_bytes = p - con_write_page;
|
|
return s - orig_s;
|
|
}
|
|
|
|
static void sunhv_console_write_paged(struct console *con, const char *s, unsigned n)
|
|
{
|
|
struct uart_port *port = sunhv_port;
|
|
unsigned long flags;
|
|
int locked = 1;
|
|
|
|
local_irq_save(flags);
|
|
if (port->sysrq) {
|
|
locked = 0;
|
|
} else if (oops_in_progress) {
|
|
locked = spin_trylock(&port->lock);
|
|
} else
|
|
spin_lock(&port->lock);
|
|
|
|
while (n > 0) {
|
|
unsigned long ra = __pa(con_write_page);
|
|
unsigned long page_bytes;
|
|
unsigned int cpy = fill_con_write_page(s, n,
|
|
&page_bytes);
|
|
|
|
n -= cpy;
|
|
s += cpy;
|
|
while (page_bytes > 0) {
|
|
unsigned long written;
|
|
int limit = 1000000;
|
|
|
|
while (limit--) {
|
|
unsigned long stat;
|
|
|
|
stat = sun4v_con_write(ra, page_bytes,
|
|
&written);
|
|
if (stat == HV_EOK)
|
|
break;
|
|
udelay(1);
|
|
}
|
|
if (limit <= 0)
|
|
break;
|
|
page_bytes -= written;
|
|
ra += written;
|
|
}
|
|
}
|
|
|
|
if (locked)
|
|
spin_unlock(&port->lock);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static inline void sunhv_console_putchar(struct uart_port *port, char c)
|
|
{
|
|
int limit = 1000000;
|
|
|
|
while (limit-- > 0) {
|
|
long status = sun4v_con_putchar(c);
|
|
if (status == HV_EOK)
|
|
break;
|
|
udelay(1);
|
|
}
|
|
}
|
|
|
|
static void sunhv_console_write_bychar(struct console *con, const char *s, unsigned n)
|
|
{
|
|
struct uart_port *port = sunhv_port;
|
|
unsigned long flags;
|
|
int i, locked = 1;
|
|
|
|
local_irq_save(flags);
|
|
if (port->sysrq) {
|
|
locked = 0;
|
|
} else if (oops_in_progress) {
|
|
locked = spin_trylock(&port->lock);
|
|
} else
|
|
spin_lock(&port->lock);
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
for (i = 0; i < n; i++) {
|
|
if (*s == '\n')
|
|
sunhv_console_putchar(port, '\r');
|
|
sunhv_console_putchar(port, *s++);
|
|
}
|
|
|
|
if (locked)
|
|
spin_unlock(&port->lock);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static struct console sunhv_console = {
|
|
.name = "ttyHV",
|
|
.write = sunhv_console_write_bychar,
|
|
.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;
|
|
unsigned long minor;
|
|
int err;
|
|
|
|
if (op->irqs[0] == 0xffffffff)
|
|
return -ENODEV;
|
|
|
|
port = kzalloc(sizeof(struct uart_port), GFP_KERNEL);
|
|
if (unlikely(!port))
|
|
return -ENOMEM;
|
|
|
|
minor = 1;
|
|
if (sun4v_hvapi_register(HV_GRP_CORE, 1, &minor) == 0 &&
|
|
minor >= 1) {
|
|
err = -ENOMEM;
|
|
con_write_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!con_write_page)
|
|
goto out_free_port;
|
|
|
|
con_read_page = kzalloc(PAGE_SIZE, GFP_KERNEL);
|
|
if (!con_read_page)
|
|
goto out_free_con_write_page;
|
|
|
|
sunhv_console.write = sunhv_console_write_paged;
|
|
sunhv_ops = &bywrite_ops;
|
|
}
|
|
|
|
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_con_read_page;
|
|
|
|
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_con_read_page:
|
|
kfree(con_read_page);
|
|
|
|
out_free_con_write_page:
|
|
kfree(con_write_page);
|
|
|
|
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",
|
|
},
|
|
{
|
|
.name = "console",
|
|
.compatible = "SUNW,sun4v-console",
|
|
},
|
|
{},
|
|
};
|
|
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");
|