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pch_uart: add sysrq support

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When send break to the uart port, we always get 'frame error', but we
can not just reset receive fifo in such case, otherwise the sysrq cmd
will not be received correctly.

When we handle sysrq output via pch_console_write, the priv lock has
already been taken so no need to take the lock in pch_console_write.

Signed-off-by: Liang Li <liang.li@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Liang Li 2013-01-19 17:52:11 +08:00 committed by Greg Kroah-Hartman
parent 384e301e35
commit 1f9db0921f
1 changed files with 19 additions and 8 deletions
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27
drivers/tty/serial/pch_uart.c
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@ -14,18 +14,21 @@
*along with this program; if not, write to the Free Software
*Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
#if defined(CONFIG_SERIAL_PCH_UART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/kernel.h>
#include <linux/serial_reg.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/console.h>
#include <linux/serial_core.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/dmi.h>
#include <linux/console.h>
#include <linux/nmi.h>
#include <linux/delay.h>
@ -553,12 +556,24 @@ static int pch_uart_hal_read(struct eg20t_port *priv, unsigned char *buf,
{
int i;
u8 rbr, lsr;
struct uart_port *port = &priv->port;
lsr = ioread8(priv->membase + UART_LSR);
for (i = 0, lsr = ioread8(priv->membase + UART_LSR);
i < rx_size && lsr & UART_LSR_DR;
i < rx_size && lsr & (UART_LSR_DR | UART_LSR_BI);
lsr = ioread8(priv->membase + UART_LSR)) {
rbr = ioread8(priv->membase + PCH_UART_RBR);
if (lsr & UART_LSR_BI) {
port->icount.brk++;
if (uart_handle_break(port))
continue;
}
if (port->sysrq) {
if (uart_handle_sysrq_char(port, rbr))
continue;
}
buf[i++] = rbr;
}
return i;
@ -1023,16 +1038,11 @@ static unsigned int dma_handle_tx(struct eg20t_port *priv)
static void pch_uart_err_ir(struct eg20t_port *priv, unsigned int lsr)
{
u8 fcr = ioread8(priv->membase + UART_FCR);
struct uart_port *port = &priv->port;
struct tty_struct *tty = tty_port_tty_get(&port->state->port);
char *error_msg[5] = {};
int i = 0;
/* Reset FIFO */
fcr |= UART_FCR_CLEAR_RCVR;
iowrite8(fcr, priv->membase + UART_FCR);
if (lsr & PCH_UART_LSR_ERR)
error_msg[i++] = "Error data in FIFO\n";
@ -1565,7 +1575,8 @@ pch_console_write(struct console *co, const char *s, unsigned int count)
local_irq_save(flags);
if (priv->port.sysrq) {
spin_lock(&priv->lock);
/* call to uart_handle_sysrq_char already took the priv lock */
priv_locked = 0;
/* serial8250_handle_port() already took the port lock */
port_locked = 0;
} else if (oops_in_progress) {