dbg_io.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- #include <linux/config.h>
- #include <asm/io.h>
- #include <asm/au1000.h>
- #ifdef CONFIG_REMOTE_DEBUG
- /*
- * FIXME the user should be able to select the
- * uart to be used for debugging.
- */
- #define DEBUG_BASE UART2_ADDR
- /**/
- /* we need uint32 uint8 */
- /* #include "types.h" */
- typedef unsigned char uint8;
- typedef unsigned int uint32;
- #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
- #define UART_RX 0 /* Receive buffer */
- #define UART_TX 4 /* Transmit buffer */
- #define UART_IER 8 /* Interrupt Enable Register */
- #define UART_IIR 0xC /* Interrupt ID Register */
- #define UART_FCR 0x10 /* FIFO Control Register */
- #define UART_LCR 0x14 /* Line Control Register */
- #define UART_MCR 0x18 /* Modem Control Register */
- #define UART_LSR 0x1C /* Line Status Register */
- #define UART_MSR 0x20 /* Modem Status Register */
- #define UART_CLK 0x28 /* Baud Rat4e Clock Divider */
- #define UART_MOD_CNTRL 0x100 /* Module Control */
- /* memory-mapped read/write of the port */
- #define UART16550_READ(y) (inl(DEBUG_BASE + y) & 0xff)
- #define UART16550_WRITE(y,z) (outl(z&0xff, DEBUG_BASE + y))
- void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop)
- {
- if (UART16550_READ(UART_MOD_CNTRL) != 0x3) {
- UART16550_WRITE(UART_MOD_CNTRL, 3);
- }
- cal_r4koff();
- /* disable interrupts */
- UART16550_WRITE(UART_IER, 0);
- /* set up baud rate */
- {
- uint32 divisor;
- /* set divisor */
- divisor = get_au1000_uart_baud() / baud;
- UART16550_WRITE(UART_CLK, divisor & 0xffff);
- }
- /* set data format */
- UART16550_WRITE(UART_LCR, 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(UART_LSR) & 0x1) == 0);
- return UART16550_READ(UART_RX);
- }
- int putDebugChar(uint8 byte)
- {
- int i;
- if (!remoteDebugInitialized) {
- remoteDebugInitialized = 1;
- debugInit(UART16550_BAUD_115200,
- UART16550_DATA_8BIT,
- UART16550_PARITY_NONE,
- UART16550_STOP_1BIT);
- }
- while ((UART16550_READ(UART_LSR)&0x40) == 0);
- UART16550_WRITE(UART_TX, byte);
- //for (i=0;i<0xfff;i++);
- return 1;
- }
- #endif