aboutsummaryrefslogtreecommitdiff
path: root/drivers/serial
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/Kconfig2
-rw-r--r--drivers/serial/bfin_5xx.c105
2 files changed, 106 insertions, 1 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 315ea991645..71a4ac53a7e 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -556,7 +556,7 @@ choice
config SERIAL_BFIN_DMA
bool "DMA mode"
- depends on DMA_UNCACHED_1M
+ depends on DMA_UNCACHED_1M && !KGDB_UART
help
This driver works under DMA mode. If this option is selected, the
blackfin simple dma driver is also enabled.
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 22569bd5d82..f7926dc7fa7 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -41,6 +41,11 @@
#include <linux/tty_flip.h>
#include <linux/serial_core.h>
+#ifdef CONFIG_KGDB_UART
+#include <linux/kgdb.h>
+#include <asm/irq_regs.h>
+#endif
+
#include <asm/gpio.h>
#include <asm/mach/bfin_serial_5xx.h>
@@ -119,6 +124,9 @@ static void bfin_serial_stop_rx(struct uart_port *port)
unsigned short ier;
ier = UART_GET_IER(uart);
+#ifdef CONFIG_KGDB_UART
+ if (uart->port.line != CONFIG_KGDB_UART_PORT)
+#endif
ier &= ~ERBFI;
UART_PUT_IER(uart, ier);
}
@@ -130,6 +138,49 @@ static void bfin_serial_enable_ms(struct uart_port *port)
{
}
+#ifdef CONFIG_KGDB_UART
+static int kgdb_entry_state;
+
+void kgdb_put_debug_char(int chr)
+{
+ struct bfin_serial_port *uart;
+
+ if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
+ uart = &bfin_serial_ports[0];
+ else
+ uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
+
+ while (!(UART_GET_LSR(uart) & THRE)) {
+ __builtin_bfin_ssync();
+ }
+ UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
+ __builtin_bfin_ssync();
+ UART_PUT_CHAR(uart, (unsigned char)chr);
+ __builtin_bfin_ssync();
+}
+
+int kgdb_get_debug_char(void)
+{
+ struct bfin_serial_port *uart;
+ unsigned char chr;
+
+ if (CONFIG_KGDB_UART_PORT<0 || CONFIG_KGDB_UART_PORT>=NR_PORTS)
+ uart = &bfin_serial_ports[0];
+ else
+ uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
+
+ while(!(UART_GET_LSR(uart) & DR)) {
+ __builtin_bfin_ssync();
+ }
+ UART_PUT_LCR(uart, UART_GET_LCR(uart)&(~DLAB));
+ __builtin_bfin_ssync();
+ chr = UART_GET_CHAR(uart);
+ __builtin_bfin_ssync();
+
+ return chr;
+}
+#endif
+
#ifdef CONFIG_SERIAL_BFIN_PIO
static void local_put_char(struct bfin_serial_port *uart, char ch)
{
@@ -152,6 +203,9 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
{
struct tty_struct *tty = uart->port.info->tty;
unsigned int status, ch, flg;
+#ifdef CONFIG_KGDB_UART
+ struct pt_regs *regs = get_irq_regs();
+#endif
#ifdef BF533_FAMILY
static int in_break = 0;
#endif
@@ -160,6 +214,27 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
ch = UART_GET_CHAR(uart);
uart->port.icount.rx++;
+#ifdef CONFIG_KGDB_UART
+ if (uart->port.line == CONFIG_KGDB_UART_PORT) {
+ if (uart->port.cons->index == CONFIG_KGDB_UART_PORT && ch == 0x1) { /* Ctrl + A */
+ kgdb_breakkey_pressed(regs);
+ return;
+ } else if (kgdb_entry_state == 0 && ch == '$') {/* connection from KGDB */
+ kgdb_entry_state = 1;
+ } else if (kgdb_entry_state == 1 && ch == 'q') {
+ kgdb_entry_state = 0;
+ kgdb_breakkey_pressed(regs);
+ return;
+ } else if (ch == 0x3) {/* Ctrl + C */
+ kgdb_entry_state = 0;
+ kgdb_breakkey_pressed(regs);
+ return;
+ } else {
+ kgdb_entry_state = 0;
+ }
+ }
+#endif
+
#ifdef BF533_FAMILY
/* The BF533 family of processors have a nice misbehavior where
* they continuously generate characters for a "single" break.
@@ -571,7 +646,11 @@ static int bfin_serial_startup(struct uart_port *port)
uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
add_timer(&(uart->rx_dma_timer));
#else
+# ifdef CONFIG_KGDB_UART
+ if (uart->port.line != CONFIG_KGDB_UART_PORT && request_irq
+# else
if (request_irq
+# endif
(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
"BFIN_UART_RX", uart)) {
printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
@@ -601,6 +680,9 @@ static void bfin_serial_shutdown(struct uart_port *port)
free_dma(uart->rx_dma_channel);
del_timer(&(uart->rx_dma_timer));
#else
+#ifdef CONFIG_KGDB_UART
+ if (uart->port.line != CONFIG_KGDB_UART_PORT)
+#endif
free_irq(uart->port.irq, uart);
free_irq(uart->port.irq+1, uart);
#endif
@@ -931,6 +1013,10 @@ static int __init bfin_serial_rs_console_init(void)
{
bfin_serial_init_ports();
register_console(&bfin_serial_console);
+#ifdef CONFIG_KGDB_UART
+ kgdb_entry_state = 0;
+ init_kgdb_uart();
+#endif
return 0;
}
console_initcall(bfin_serial_rs_console_init);
@@ -1023,6 +1109,10 @@ static struct platform_driver bfin_serial_driver = {
static int __init bfin_serial_init(void)
{
int ret;
+#ifdef CONFIG_KGDB_UART
+ struct bfin_serial_port *uart = &bfin_serial_ports[CONFIG_KGDB_UART_PORT];
+ struct termios t;
+#endif
pr_info("Serial: Blackfin serial driver\n");
@@ -1036,6 +1126,21 @@ static int __init bfin_serial_init(void)
uart_unregister_driver(&bfin_serial_reg);
}
}
+#ifdef CONFIG_KGDB_UART
+ if (uart->port.cons->index != CONFIG_KGDB_UART_PORT) {
+ request_irq(uart->port.irq, bfin_serial_int,
+ IRQF_DISABLED, "BFIN_UART_RX", uart);
+ pr_info("Request irq for kgdb uart port\n");
+ UART_PUT_IER(uart, UART_GET_IER(uart) | ERBFI);
+ __builtin_bfin_ssync();
+ t.c_cflag = CS8|B57600;
+ t.c_iflag = 0;
+ t.c_oflag = 0;
+ t.c_lflag = ICANON;
+ t.c_line = CONFIG_KGDB_UART_PORT;
+ bfin_serial_set_termios(&uart->port, &t, &t);
+ }
+#endif
return ret;
}