Blackfin arch: kgdb specific code

[linux-2.6-omap-h63xx.git] / drivers / serial / bfin_5xx.c

diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 22569bd5d821e37e7f0b9f5aaaf15909831032dc..f7926dc7fa78921468c9d10820fc3c9734f31d52 100644 (file)
--- 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;
 }