Blackfin arch: kgdb specific code

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

2 files changed, 106 insertions, 1 deletions

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 315ea9916456..71a4ac53a7ef 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 22569bd5d821..f7926dc7fa78 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;
 }