diff options
Diffstat (limited to 'arch/mips/ite-boards/generic/dbg_io.c')
| -rw-r--r-- | arch/mips/ite-boards/generic/dbg_io.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/arch/mips/ite-boards/generic/dbg_io.c b/arch/mips/ite-boards/generic/dbg_io.c new file mode 100644 index 00000000000..c4f8530fd07 --- /dev/null +++ b/arch/mips/ite-boards/generic/dbg_io.c @@ -0,0 +1,125 @@ + +#include <linux/config.h> + +#ifdef CONFIG_KGDB + +/* --- CONFIG --- */ + +/* we need uint32 uint8 */ +/* #include "types.h" */ +typedef unsigned char uint8; +typedef unsigned int uint32; + +/* --- END OF CONFIG --- */ + +#define UART16550_BAUD_2400 2400 +#define UART16550_BAUD_4800 4800 +#define UART16550_BAUD_9600 9600 +#define UART16550_BAUD_19200 19200 +#define UART16550_BAUD_38400 38400 +#define UART16550_BAUD_57600 57600 +#define UART16550_BAUD_115200 115200 + +#define UART16550_PARITY_NONE 0 +#define UART16550_PARITY_ODD 0x08 +#define UART16550_PARITY_EVEN 0x18 +#define UART16550_PARITY_MARK 0x28 +#define UART16550_PARITY_SPACE 0x38 + +#define UART16550_DATA_5BIT 0x0 +#define UART16550_DATA_6BIT 0x1 +#define UART16550_DATA_7BIT 0x2 +#define UART16550_DATA_8BIT 0x3 + +#define UART16550_STOP_1BIT 0x0 +#define UART16550_STOP_2BIT 0x4 + +/* ----------------------------------------------------- */ + +/* === CONFIG === */ + +/* [stevel] we use the IT8712 serial port for kgdb */ +#define DEBUG_BASE 0xB40003F8 /* 8712 serial port 1 base address */ +#define MAX_BAUD 115200 + +/* === END OF CONFIG === */ + +/* register offset */ +#define OFS_RCV_BUFFER 0 +#define OFS_TRANS_HOLD 0 +#define OFS_SEND_BUFFER 0 +#define OFS_INTR_ENABLE 1 +#define OFS_INTR_ID 2 +#define OFS_DATA_FORMAT 3 +#define OFS_LINE_CONTROL 3 +#define OFS_MODEM_CONTROL 4 +#define OFS_RS232_OUTPUT 4 +#define OFS_LINE_STATUS 5 +#define OFS_MODEM_STATUS 6 +#define OFS_RS232_INPUT 6 +#define OFS_SCRATCH_PAD 7 + +#define OFS_DIVISOR_LSB 0 +#define OFS_DIVISOR_MSB 1 + + +/* memory-mapped read/write of the port */ +#define UART16550_READ(y) (*((volatile uint8*)(DEBUG_BASE + y))) +#define UART16550_WRITE(y,z) ((*((volatile uint8*)(DEBUG_BASE + y))) = z) + +void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop) +{ + /* disable interrupts */ + UART16550_WRITE(OFS_INTR_ENABLE, 0); + + /* set up buad rate */ + { + uint32 divisor; + + /* set DIAB bit */ + UART16550_WRITE(OFS_LINE_CONTROL, 0x80); + + /* set divisor */ + divisor = MAX_BAUD / baud; + UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff); + UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00) >> 8); + + /* clear DIAB bit */ + UART16550_WRITE(OFS_LINE_CONTROL, 0x0); + } + + /* set data format */ + UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop); +} + +static int remoteDebugInitialized = 0; + +uint8 getDebugChar(void) +{ + if (!remoteDebugInitialized) { + remoteDebugInitialized = 1; + debugInit(UART16550_BAUD_115200, + UART16550_DATA_8BIT, + UART16550_PARITY_NONE, UART16550_STOP_1BIT); + } + + while ((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0); + return UART16550_READ(OFS_RCV_BUFFER); +} + + +int putDebugChar(uint8 byte) +{ + if (!remoteDebugInitialized) { + remoteDebugInitialized = 1; + debugInit(UART16550_BAUD_115200, + UART16550_DATA_8BIT, + UART16550_PARITY_NONE, UART16550_STOP_1BIT); + } + + while ((UART16550_READ(OFS_LINE_STATUS) & 0x20) == 0); + UART16550_WRITE(OFS_SEND_BUFFER, byte); + return 1; +} + +#endif |