158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
/*
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* Copyright (c) 2008 Travis Geiselbrecht
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdarg.h>
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#include <reg.h>
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#include <debug.h>
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#include <printf.h>
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#include <kernel/thread.h>
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#include <kernel/timer.h>
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#include <platform/debug.h>
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#include <arch/ops.h>
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#include <platform/omap5912.h>
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#include <lib/cbuf.h>
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static cbuf_t debug_buf;
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static timer_t debug_timer;
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static void write_uart_reg(int uart, int reg, unsigned char data)
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{
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unsigned long base;
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int mul = 4;
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switch(uart) {
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case 0: base = UART0_BASE; break;
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case 1: base = UART1_BASE; break;
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case 2: base = UART2_BASE; break;
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default: return;
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}
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*(volatile unsigned char *)(base + reg * mul) = data;
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}
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static unsigned char read_uart_reg(int uart, int reg)
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{
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unsigned long base;
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int mul = 4;
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switch(uart) {
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case 0: base = UART0_BASE; break;
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case 1: base = UART1_BASE; break;
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case 2: base = UART2_BASE; break;
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default: return 0;
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}
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return *(volatile unsigned char *)(base + reg * mul);
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}
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static int uart_init(void)
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{
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/* clear the tx & rx fifo and disable */
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write_uart_reg(0, UART_FCR, 0x6);
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return 0;
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}
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static int uart_putc(int port, char c )
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{
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while (!(read_uart_reg(port, UART_LSR) & (1<<6))) // wait for the shift register to empty
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;
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write_uart_reg(port, UART_THR, c);
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return 0;
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}
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static int uart_getc(int port, bool wait) /* returns -1 if no data available */
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{
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if (wait) {
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while (!(read_uart_reg(port, UART_LSR) & (1<<0))) // wait for data to show up in the rx fifo
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;
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} else {
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if (!(read_uart_reg(port, UART_LSR) & (1<<0)))
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return -1;
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}
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return read_uart_reg(port, UART_RHR);
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}
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void _dputc(char c)
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{
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if (c == '\n')
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uart_putc(0, '\r');
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uart_putc(0, c);
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}
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static enum handler_return debug_timer_callback(timer_t *t, time_t now, void *arg)
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{
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signed char c;
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c = uart_getc(0, false);
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if (c > 0) {
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cbuf_write(&debug_buf, &c, 1, false);
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return INT_RESCHEDULE;
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} else {
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return INT_NO_RESCHEDULE;
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}
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}
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int dgetc(char *c, bool wait)
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{
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ssize_t len;
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len = cbuf_read(&debug_buf, c, 1, wait);
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return len;
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}
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void debug_dump_regs(void)
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{
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PANIC_UNIMPLEMENTED;
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}
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void platform_halt(void)
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{
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dprintf(ALWAYS, "HALT: spinning forever...\n");
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for(;;);
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}
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void debug_dump_memory_bytes(void *mem, int len)
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{
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PANIC_UNIMPLEMENTED;
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}
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void debug_dump_memory_halfwords(void *mem, int len)
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{
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PANIC_UNIMPLEMENTED;
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}
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void debug_dump_memory_words(void *mem, int len)
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{
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PANIC_UNIMPLEMENTED;
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}
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void debug_set_trace_level(int trace_type, int level)
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{
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PANIC_UNIMPLEMENTED;
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}
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void platform_init_debug(void)
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{
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cbuf_initialize(&debug_buf, 512);
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timer_set_periodic(&debug_timer, 10, &debug_timer_callback, NULL);
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}
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