1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
138 lines
2 KiB
C
138 lines
2 KiB
C
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/*
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* Debug routines which directly access the uart.
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*/
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#include <linux/types.h>
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#include <asm/gt64120.h>
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//#define SERIAL_BASE EV96100_UART0_REGS_BASE
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#define SERIAL_BASE 0xBD000020
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#define NS16550_BASE SERIAL_BASE
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#define SERA_CMD 0x0D
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#define SERA_DATA 0x08
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//#define SERB_CMD 0x05
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#define SERB_CMD 20
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#define SERB_DATA 0x00
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#define TX_BUSY 0x20
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#define TIMEOUT 0xffff
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#undef SLOW_DOWN
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static const char digits[16] = "0123456789abcdef";
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static volatile unsigned char *const com1 = (unsigned char *) SERIAL_BASE;
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#ifdef SLOW_DOWN
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static inline void slow_down()
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{
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int k;
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for (k = 0; k < 10000; k++);
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}
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#else
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#define slow_down()
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#endif
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void putch(const unsigned char c)
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{
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unsigned char ch;
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int i = 0;
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do {
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ch = com1[SERB_CMD];
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slow_down();
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i++;
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if (i > TIMEOUT) {
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break;
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}
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} while (0 == (ch & TX_BUSY));
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com1[SERB_DATA] = c;
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}
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void putchar(const unsigned char c)
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{
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unsigned char ch;
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int i = 0;
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do {
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ch = com1[SERB_CMD];
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slow_down();
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i++;
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if (i > TIMEOUT) {
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break;
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}
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} while (0 == (ch & TX_BUSY));
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com1[SERB_DATA] = c;
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}
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void puts(unsigned char *cp)
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{
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unsigned char ch;
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int i = 0;
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while (*cp) {
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do {
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ch = com1[SERB_CMD];
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slow_down();
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i++;
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if (i > TIMEOUT) {
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break;
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}
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} while (0 == (ch & TX_BUSY));
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com1[SERB_DATA] = *cp++;
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}
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putch('\r');
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putch('\n');
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}
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void fputs(unsigned char *cp)
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{
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unsigned char ch;
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int i = 0;
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while (*cp) {
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do {
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ch = com1[SERB_CMD];
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slow_down();
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i++;
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if (i > TIMEOUT) {
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break;
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}
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} while (0 == (ch & TX_BUSY));
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com1[SERB_DATA] = *cp++;
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}
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}
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void put64(uint64_t ul)
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{
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int cnt;
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unsigned ch;
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cnt = 16; /* 16 nibbles in a 64 bit long */
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putch('0');
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putch('x');
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do {
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cnt--;
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ch = (unsigned char) (ul >> cnt * 4) & 0x0F;
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putch(digits[ch]);
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} while (cnt > 0);
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}
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void put32(unsigned u)
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{
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int cnt;
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unsigned ch;
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cnt = 8; /* 8 nibbles in a 32 bit long */
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putch('0');
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putch('x');
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do {
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cnt--;
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ch = (unsigned char) (u >> cnt * 4) & 0x0F;
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putch(digits[ch]);
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} while (cnt > 0);
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}
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