src/bsp/lk/platform/stm32f4xx/debug.c

/*
 * Copyright (c) 2012 Travis Geiselbrecht
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include <stdarg.h>
#include <reg.h>
#include <debug.h>
#include <stdio.h>
#include <kernel/thread.h>
#include <platform/debug.h>
#include <arch/ops.h>
#include <dev/uart.h>
#include <target/debugconfig.h>
#include <stm32f4xx_rcc.h>
#include <stm32f4xx_usart.h>
#include <arch/arm/cm.h>

void stm32_debug_early_init(void)
{
	uart_init_early();
}

/* later in the init process */
void stm32_debug_init(void)
{
	uart_init();
}

#define ITM_STIM0	0xE0000000
#define ITM_TCR		0xE0000E80

void platform_dputc(char c)
{
	// if ITM is enabled, send character to STIM0
	if (readl(ITM_TCR) & 1) {
		while (!readl(ITM_STIM0)) ;
		writeb(c, ITM_STIM0);
	}

	if (c == '\n')
		uart_putc(DEBUG_UART, '\r');
	uart_putc(DEBUG_UART, c);
}

int platform_dgetc(char *c, bool wait)
{
	int ret = uart_getc(DEBUG_UART, wait);
	if (ret == -1)
		return -1;
	*c = ret;
	return 0;
}

void __debugger_console_putc(char c);

#define DCRDR 0xE000EDF8

void _debugmonitor(void) {
	u32 n;
	arm_cm_irq_entry();
	n = readl(DCRDR);
	if (n & 0x80000000) {
		switch (n >> 24) {
		case 0x80: // write to console
			__debugger_console_putc(n & 0xFF);
			n = 0;
			break;
		default:
			n = 0x01000000;
		}
		writel(n, DCRDR);
	}
	arm_cm_irq_exit(1);
}