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