| |
| #if defined(CONFIG_REMOTE_DEBUG) |
| |
| #include <asm/serial.h> /* For the serial port location and base baud */ |
| |
| /* --- CONFIG --- */ |
| |
| 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 === */ |
| |
| /* [jsun] we use the second serial port for kdb */ |
| #define BASE OCELOT_SERIAL1_BASE |
| #define MAX_BAUD OCELOT_BASE_BAUD |
| |
| /* === END OF CONFIG === */ |
| |
| #define REG_OFFSET 4 |
| |
| /* register offset */ |
| #define OFS_RCV_BUFFER 0 |
| #define OFS_TRANS_HOLD 0 |
| #define OFS_SEND_BUFFER 0 |
| #define OFS_INTR_ENABLE (1*REG_OFFSET) |
| #define OFS_INTR_ID (2*REG_OFFSET) |
| #define OFS_DATA_FORMAT (3*REG_OFFSET) |
| #define OFS_LINE_CONTROL (3*REG_OFFSET) |
| #define OFS_MODEM_CONTROL (4*REG_OFFSET) |
| #define OFS_RS232_OUTPUT (4*REG_OFFSET) |
| #define OFS_LINE_STATUS (5*REG_OFFSET) |
| #define OFS_MODEM_STATUS (6*REG_OFFSET) |
| #define OFS_RS232_INPUT (6*REG_OFFSET) |
| #define OFS_SCRATCH_PAD (7*REG_OFFSET) |
| |
| #define OFS_DIVISOR_LSB (0*REG_OFFSET) |
| #define OFS_DIVISOR_MSB (1*REG_OFFSET) |
| |
| |
| /* memory-mapped read/write of the port */ |
| #define UART16550_READ(y) (*((volatile uint8*)(BASE + y))) |
| #define UART16550_WRITE(y, z) ((*((volatile uint8*)(BASE + y))) = z) |
| |
| void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop) |
| { |
| /* disable interrupts */ |
| UART16550_WRITE(OFS_INTR_ENABLE, 0); |
| |
| /* set up baud 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_38400, |
| 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_38400, |
| 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 |