Viewing file:  dbg_io.c (3.08 KB) -rw-r--r--
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#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
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