/* sunhv.c: Serial driver for SUN4V hypervisor console.
*
- * Copyright (C) 2006 David S. Miller (davem@davemloft.net)
+ * Copyright (C) 2006, 2007 David S. Miller (davem@davemloft.net)
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
+#include <linux/of_device.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 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));
+#define IGNORE_BREAK 0x1
+#define IGNORE_ALL 0x2
- *status = arg0;
+static char *con_write_page;
+static char *con_read_page;
- return (long) arg1;
-}
+static int hung_up = 0;
-static inline long hypervisor_con_putchar(long ch)
+static void transmit_chars_putchar(struct uart_port *port, struct circ_buf *xmit)
{
- register unsigned long func asm("%o5");
- register unsigned long arg0 asm("%o0");
+ while (!uart_circ_empty(xmit)) {
+ long status = sun4v_con_putchar(xmit->buf[xmit->tail]);
- func = HV_FAST_CONS_PUTCHAR;
- arg0 = ch;
- __asm__ __volatile__("ta %4"
- : "=&r" (func), "=&r" (arg0)
- : "0" (func), "1" (arg0), "i" (HV_FAST_TRAP));
+ if (status != HV_EOK)
+ break;
- return (long) arg0;
+ xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+ port->icount.tx++;
+ }
}
-#define IGNORE_BREAK 0x1
-#define IGNORE_ALL 0x2
+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;
-static int hung_up = 0;
+ 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 struct tty_struct *receive_chars(struct uart_port *port)
+static int receive_chars_getchar(struct uart_port *port, struct tty_struct *tty)
{
- 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;
+ long c = sun4v_con_getchar(&status);
if (status == HV_EWOULDBLOCK)
break;
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)))
+ 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;
- tty_insert_flip_char(tty, c, flag);
+ port->icount.rx += bytes_read;
+
+ tty_insert_flip_string(tty, con_read_page, bytes_read);
}
- if (saw_console_brk)
+ 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->state != NULL) /* Unopened serial console */
+ tty = port->state->port.tty;
+
+ if (sunhv_ops->receive_chars(port, tty))
sun_do_break();
return tty;
{
struct circ_buf *xmit;
- if (!port->info)
+ if (!port->state)
return;
- xmit = &port->info->xmit;
+ xmit = &port->state->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++;
- }
+ sunhv_ops->transmit_chars(port, xmit);
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
/* 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++;
- }
+ transmit_chars(port);
}
/* port->lock is not held. */
spin_lock_irqsave(&port->lock, flags);
while (limit-- > 0) {
- long status = hypervisor_con_putchar(ch);
+ long status = sun4v_con_putchar(ch);
if (status == HV_EOK)
break;
+ udelay(1);
}
spin_unlock_irqrestore(&port->lock, flags);
{
if (break_state) {
unsigned long flags;
- int limit = 1000000;
+ int limit = 10000;
spin_lock_irqsave(&port->lock, flags);
while (limit-- > 0) {
- long status = hypervisor_con_putchar(CON_BREAK);
+ long status = sun4v_con_putchar(CON_BREAK);
if (status == HV_EOK)
break;
- udelay(2);
+ udelay(1);
}
spin_unlock_irqrestore(&port->lock, flags);
static struct uart_driver sunhv_reg = {
.owner = THIS_MODULE,
- .driver_name = "serial",
+ .driver_name = "sunhv",
.dev_name = "ttyS",
.major = TTY_MAJOR,
};
static struct uart_port *sunhv_port;
-static inline void sunhv_console_putchar(struct uart_port *port, char c)
+/* 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 limit = 1000000;
+ 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;
+ }
+ }
- spin_lock_irqsave(&port->lock, flags);
+ 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 = hypervisor_con_putchar(c);
+ long status = sun4v_con_putchar(c);
if (status == HV_EOK)
break;
- udelay(2);
+ udelay(1);
}
-
- spin_unlock_irqrestore(&port->lock, flags);
}
-static void sunhv_console_write(struct console *con, const char *s, unsigned n)
+static void sunhv_console_write_bychar(struct console *con, const char *s, unsigned n)
{
struct uart_port *port = sunhv_port;
- int i;
+ 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);
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,
+ .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)
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->dev = &op->dev;
- sunhv_reg.minor = sunserial_current_minor;
- sunhv_reg.nr = 1;
-
- err = uart_register_driver(&sunhv_reg);
+ err = sunserial_register_minors(&sunhv_reg, 1);
if (err)
- goto out_free_port;
+ 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();
+ sunserial_console_match(&sunhv_console, op->node,
+ &sunhv_reg, port->line, false);
err = uart_add_one_port(&sunhv_reg, port);
if (err)
uart_remove_one_port(&sunhv_reg, port);
out_unregister_driver:
- sunserial_current_minor -= 1;
- uart_unregister_driver(&sunhv_reg);
+ sunserial_unregister_minors(&sunhv_reg, 1);
+
+out_free_con_read_page:
+ kfree(con_read_page);
+
+out_free_con_write_page:
+ kfree(con_write_page);
out_free_port:
kfree(port);
uart_remove_one_port(&sunhv_reg, port);
- sunserial_current_minor -= 1;
- uart_unregister_driver(&sunhv_reg);
+ sunserial_unregister_minors(&sunhv_reg, 1);
kfree(port);
sunhv_port = NULL;
return 0;
}
-static struct of_device_id hv_match[] = {
+static const struct of_device_id hv_match[] = {
{
.name = "console",
.compatible = "qcn",
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff