xburst-tools/xbboot/target-stage1/stage1.c

//
// Authors: Wolfgang Spraul <wolfgang@sharism.cc>
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version
// 3 of the License, or (at your option) any later version.
//

#include "common.h"
#include "serial.h"

extern void gpio_init_4740();
extern void pll_init_4740();
extern void serial_init_4740(int uart);
extern void sdram_init_4740();
extern void nand_init_4740();

extern void gpio_init_4760();
extern void pll_init_4760();
extern void cpm_start_all_4760();
extern void serial_init_4760(int uart);
extern void sdram_init_4760();

void load_args_4740()
{
	ARG_CPU_ID = 0x4740;
	ARG_EXTAL = 12 * 1000000;
	ARG_CPU_SPEED = 21 * ARG_EXTAL;
	ARG_PHM_DIV = 3;
	ARG_UART_BAUD = 57600;
	ARG_BUS_WIDTH_16 = * (int *)0x80002014;
	ARG_BANK_ADDR_2BIT = 1;
	ARG_ROW_ADDR = 13;
	ARG_COL_ADDR = 9;
}

void load_args_4760()
{
	ARG_CPU_ID = 0x4760;
	ARG_EXTAL = 12 * 1000000;
	ARG_CPU_SPEED = 12 * ARG_EXTAL;
	ARG_PHM_DIV = 3;
	ARG_UART_BAUD = 57600;
	ARG_BUS_WIDTH_16 = * (int *)0x80002014;
	ARG_BANK_ADDR_2BIT = 4;
	ARG_ROW_ADDR = 12;
	ARG_COL_ADDR = 9;
}


void c_main(void)
{
	load_args_4740();

	switch (ARG_CPU_ID)	{
	case 0x4740:
		gpio_init_4740();
		serial_init_4740(0);
		pll_init_4740();
		sdram_init_4740();
		nand_init_4740();
		break;
	case 0x4760:	
		gpio_init_4760();
		cpm_start_all_4760();
		serial_init_4760(1);
		pll_init_4760();
		sdram_init_4760();
		break;
	default:
		return;
	}

	serial_puts("stage 1 finished: GPIO, clocks, SDRAM, UART setup\n"
		    "now jump back to BOOT ROM...\n");

	if (ARG_CPU_ID ==  0x4740) {
		__asm__ (
		"li  $31, 0xbfc012e0 \n\t"
		"jr  $31 \n\t "
		);
	}
}