lpec.c

GDB Remote Stub Backend for debugging an embedded ARM system via JTAG common hardware debug interfac

/*
 *  Copyright (C) 2004 Tobias Lorenz
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/* lpec-p2001 specific functions */

#include <stdio.h>

#include "debug.h"
#include "memory.h"

#define Adr_Timer12_PreDiv      		0x0011000CU
#define Adr_Timer12_PreDiv_WATCHDOG_DISABLE	(1<<30)
#define Adr_Timer12_PreDiv_WATCHDOG_RESET	(1<<31)

#define Adr_SDRAM_Ctrl				0x00100010U
#define Adr_SDRAM_Ctrl_CLKENEN			(1<<30)
#define Adr_SDRAM_Ctrl_SDRAMCTRLEN		(1<<31)

#define Adr_TOP					0x00100020U
#define Adr_TOP_LED2				(1<<0)


void lpec_change_reg(unsigned long addr, unsigned long data)
{
    unsigned long regdata;

    memory_read(addr, &regdata, 1);
    printf("%8.8x: %8.8x --> ", addr, regdata);
    regdata = data;
    memory_write(addr, &regdata, 1);
    printf("%8.8x", regdata);
    if (regdata != data)
	printf(" != %8.8x", data);
    printf("\n");
}

void lpec_configure(void)
{
    lpec_change_reg(0x00100010, 0xee4f0027);	// SDRAM Init
    lpec_change_reg(0x00100014, 0x00000009);	// Flash = 16Bit, FPGA = 32Bit
    lpec_change_reg(0x00100018, 0x00000045);	// Flash und FPGA Waitstates
    lpec_change_reg(0x0012002c, 0x00000003);	// FPGA Reset beenden
}

void lpec_disable_watchdog(void)
{
    unsigned long before, after;

    printf("Disabling watchdog on lpec...\n");
    memory_read(Adr_Timer12_PreDiv, &before, 1);
    lpec_change_reg(Adr_Timer12_PreDiv, 0x40bb00bb);
    memory_read(Adr_Timer12_PreDiv, &after, 1);

    printf( (before & Adr_Timer12_PreDiv_WATCHDOG_DISABLE) ? "disabled" : "enabled" );
    printf(" --> ");
    printf( (after & Adr_Timer12_PreDiv_WATCHDOG_DISABLE) ? "disabled\n" : "enabled\n" );
}

void lpec_disable_ints(void)
{
    lpec_change_reg(0x00130000, 0);
    lpec_change_reg(0x00130004, 0);
}

void lpec_init(void)
{
    lpec_configure();
    lpec_disable_watchdog();
    lpec_disable_ints();
}