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-rw-r--r--drivers/serial/8250.c4
-rw-r--r--drivers/serial/amba-pl011.c6
-rw-r--r--drivers/serial/kgdboc.c75
-rw-r--r--drivers/serial/sh-sci.c6
-rw-r--r--drivers/serial/sunzilog.c50
5 files changed, 128 insertions, 13 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 2b1ea3d4c4f..891e1dd65f2 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -1891,8 +1891,8 @@ static int serial8250_get_poll_char(struct uart_port *port)
struct uart_8250_port *up = (struct uart_8250_port *)port;
unsigned char lsr = serial_inp(up, UART_LSR);
- while (!(lsr & UART_LSR_DR))
- lsr = serial_inp(up, UART_LSR);
+ if (!(lsr & UART_LSR_DR))
+ return NO_POLL_CHAR;
return serial_inp(up, UART_RX);
}
diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 743ebf5f16d..eb4cb480b93 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -342,9 +342,9 @@ static int pl010_get_poll_char(struct uart_port *port)
struct uart_amba_port *uap = (struct uart_amba_port *)port;
unsigned int status;
- do {
- status = readw(uap->port.membase + UART01x_FR);
- } while (status & UART01x_FR_RXFE);
+ status = readw(uap->port.membase + UART01x_FR);
+ if (status & UART01x_FR_RXFE)
+ return NO_POLL_CHAR;
return readw(uap->port.membase + UART01x_DR);
}
diff --git a/drivers/serial/kgdboc.c b/drivers/serial/kgdboc.c
index eadc1ab6bbc..b765ab48dfe 100644
--- a/drivers/serial/kgdboc.c
+++ b/drivers/serial/kgdboc.c
@@ -14,7 +14,9 @@
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/kgdb.h>
+#include <linux/kdb.h>
#include <linux/tty.h>
+#include <linux/console.h>
#define MAX_CONFIG_LEN 40
@@ -32,6 +34,40 @@ static struct kparam_string kps = {
static struct tty_driver *kgdb_tty_driver;
static int kgdb_tty_line;
+#ifdef CONFIG_KDB_KEYBOARD
+static int kgdboc_register_kbd(char **cptr)
+{
+ if (strncmp(*cptr, "kbd", 3) == 0) {
+ if (kdb_poll_idx < KDB_POLL_FUNC_MAX) {
+ kdb_poll_funcs[kdb_poll_idx] = kdb_get_kbd_char;
+ kdb_poll_idx++;
+ if (cptr[0][3] == ',')
+ *cptr += 4;
+ else
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static void kgdboc_unregister_kbd(void)
+{
+ int i;
+
+ for (i = 0; i < kdb_poll_idx; i++) {
+ if (kdb_poll_funcs[i] == kdb_get_kbd_char) {
+ kdb_poll_idx--;
+ kdb_poll_funcs[i] = kdb_poll_funcs[kdb_poll_idx];
+ kdb_poll_funcs[kdb_poll_idx] = NULL;
+ i--;
+ }
+ }
+}
+#else /* ! CONFIG_KDB_KEYBOARD */
+#define kgdboc_register_kbd(x) 0
+#define kgdboc_unregister_kbd()
+#endif /* ! CONFIG_KDB_KEYBOARD */
+
static int kgdboc_option_setup(char *opt)
{
if (strlen(opt) > MAX_CONFIG_LEN) {
@@ -45,25 +81,51 @@ static int kgdboc_option_setup(char *opt)
__setup("kgdboc=", kgdboc_option_setup);
+static void cleanup_kgdboc(void)
+{
+ kgdboc_unregister_kbd();
+ if (configured == 1)
+ kgdb_unregister_io_module(&kgdboc_io_ops);
+}
+
static int configure_kgdboc(void)
{
struct tty_driver *p;
int tty_line = 0;
int err;
+ char *cptr = config;
+ struct console *cons;
err = kgdboc_option_setup(config);
if (err || !strlen(config) || isspace(config[0]))
goto noconfig;
err = -ENODEV;
+ kgdboc_io_ops.is_console = 0;
+ kgdb_tty_driver = NULL;
- p = tty_find_polling_driver(config, &tty_line);
+ if (kgdboc_register_kbd(&cptr))
+ goto do_register;
+
+ p = tty_find_polling_driver(cptr, &tty_line);
if (!p)
goto noconfig;
+ cons = console_drivers;
+ while (cons) {
+ int idx;
+ if (cons->device && cons->device(cons, &idx) == p &&
+ idx == tty_line) {
+ kgdboc_io_ops.is_console = 1;
+ break;
+ }
+ cons = cons->next;
+ }
+
kgdb_tty_driver = p;
kgdb_tty_line = tty_line;
+do_register:
err = kgdb_register_io_module(&kgdboc_io_ops);
if (err)
goto noconfig;
@@ -75,6 +137,7 @@ static int configure_kgdboc(void)
noconfig:
config[0] = 0;
configured = 0;
+ cleanup_kgdboc();
return err;
}
@@ -88,20 +151,18 @@ static int __init init_kgdboc(void)
return configure_kgdboc();
}
-static void cleanup_kgdboc(void)
-{
- if (configured == 1)
- kgdb_unregister_io_module(&kgdboc_io_ops);
-}
-
static int kgdboc_get_char(void)
{
+ if (!kgdb_tty_driver)
+ return -1;
return kgdb_tty_driver->ops->poll_get_char(kgdb_tty_driver,
kgdb_tty_line);
}
static void kgdboc_put_char(u8 chr)
{
+ if (!kgdb_tty_driver)
+ return;
kgdb_tty_driver->ops->poll_put_char(kgdb_tty_driver,
kgdb_tty_line, chr);
}
diff --git a/drivers/serial/sh-sci.c b/drivers/serial/sh-sci.c
index 8d993c4ccea..f250a610a26 100644
--- a/drivers/serial/sh-sci.c
+++ b/drivers/serial/sh-sci.c
@@ -151,7 +151,11 @@ static int sci_poll_get_char(struct uart_port *port)
handle_error(port);
continue;
}
- } while (!(status & SCxSR_RDxF(port)));
+ break;
+ } while (1);
+
+ if (!(status & SCxSR_RDxF(port)))
+ return NO_POLL_CHAR;
c = sci_in(port, SCxRDR);
diff --git a/drivers/serial/sunzilog.c b/drivers/serial/sunzilog.c
index 2c7a66af4f5..978b3cee02d 100644
--- a/drivers/serial/sunzilog.c
+++ b/drivers/serial/sunzilog.c
@@ -102,6 +102,8 @@ struct uart_sunzilog_port {
#endif
};
+static void sunzilog_putchar(struct uart_port *port, int ch);
+
#define ZILOG_CHANNEL_FROM_PORT(PORT) ((struct zilog_channel __iomem *)((PORT)->membase))
#define UART_ZILOG(PORT) ((struct uart_sunzilog_port *)(PORT))
@@ -996,6 +998,50 @@ static int sunzilog_verify_port(struct uart_port *port, struct serial_struct *se
return -EINVAL;
}
+#ifdef CONFIG_CONSOLE_POLL
+static int sunzilog_get_poll_char(struct uart_port *port)
+{
+ unsigned char ch, r1;
+ struct uart_sunzilog_port *up = (struct uart_sunzilog_port *) port;
+ struct zilog_channel __iomem *channel
+ = ZILOG_CHANNEL_FROM_PORT(&up->port);
+
+
+ r1 = read_zsreg(channel, R1);
+ if (r1 & (PAR_ERR | Rx_OVR | CRC_ERR)) {
+ writeb(ERR_RES, &channel->control);
+ ZSDELAY();
+ ZS_WSYNC(channel);
+ }
+
+ ch = readb(&channel->control);
+ ZSDELAY();
+
+ /* This funny hack depends upon BRK_ABRT not interfering
+ * with the other bits we care about in R1.
+ */
+ if (ch & BRK_ABRT)
+ r1 |= BRK_ABRT;
+
+ if (!(ch & Rx_CH_AV))
+ return NO_POLL_CHAR;
+
+ ch = readb(&channel->data);
+ ZSDELAY();
+
+ ch &= up->parity_mask;
+ return ch;
+}
+
+static void sunzilog_put_poll_char(struct uart_port *port,
+ unsigned char ch)
+{
+ struct uart_sunzilog_port *up = (struct uart_sunzilog_port *)port;
+
+ sunzilog_putchar(&up->port, ch);
+}
+#endif /* CONFIG_CONSOLE_POLL */
+
static struct uart_ops sunzilog_pops = {
.tx_empty = sunzilog_tx_empty,
.set_mctrl = sunzilog_set_mctrl,
@@ -1013,6 +1059,10 @@ static struct uart_ops sunzilog_pops = {
.request_port = sunzilog_request_port,
.config_port = sunzilog_config_port,
.verify_port = sunzilog_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = sunzilog_get_poll_char,
+ .poll_put_char = sunzilog_put_poll_char,
+#endif
};
static int uart_chip_count;
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-21 05:51:37 +0000