board/freescale/mx31ads/mx31ads.c

/*
 * Copyright (C) 2008, Guennadi Liakhovetski <lg@denx.de>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <asm/io.h>
#include <asm/arch/mx31.h>
#include <asm/arch/mx31-regs.h>

DECLARE_GLOBAL_DATA_PTR;

int dram_init (void)
{
	gd->bd->bi_dram[0].start = PHYS_SDRAM_1;
	gd->bd->bi_dram[0].size = PHYS_SDRAM_1_SIZE;

	return 0;
}

int board_init (void)
{
	int i;

	/* CS0: Nor Flash */
	/*
	 * CS0L and CS0A values are from the RedBoot sources by Freescale
	 * and are also equal to those used by Sascha Hauer for the Phytec
	 * i.MX31 board. CS0U is just a slightly optimized hardware default:
	 * the only non-zero field "Wait State Control" is set to half the
	 * default value.
	 */
	__REG(CSCR_U(0)) = 0x00000f00;
	__REG(CSCR_L(0)) = 0x10000D03;
	__REG(CSCR_A(0)) = 0x00720900;

	/* setup pins for UART1 */
	mx31_gpio_mux(MUX_RXD1__UART1_RXD_MUX);
	mx31_gpio_mux(MUX_TXD1__UART1_TXD_MUX);
	mx31_gpio_mux(MUX_RTS1__UART1_RTS_B);
	mx31_gpio_mux(MUX_CTS1__UART1_CTS_B);

	/* SPI2 */
	mx31_gpio_mux(MUX_CSPI2_SS2__CSPI2_SS2_B);
	mx31_gpio_mux(MUX_CSPI2_SCLK__CSPI2_CLK);
	mx31_gpio_mux(MUX_CSPI2_SPI_RDY__CSPI2_DATAREADY_B);
	mx31_gpio_mux(MUX_CSPI2_MOSI__CSPI2_MOSI);
	mx31_gpio_mux(MUX_CSPI2_MISO__CSPI2_MISO);
	mx31_gpio_mux(MUX_CSPI2_SS0__CSPI2_SS0_B);
	mx31_gpio_mux(MUX_CSPI2_SS1__CSPI2_SS1_B);

	/* start SPI2 clock */
	__REG(CCM_CGR2) = __REG(CCM_CGR2) | (3 << 4);

	/* PBC setup */
	/* Enable UART transceivers also reset the Ethernet/external UART */
	readw(CS4_BASE + 4);

	writew(0x8023, CS4_BASE + 4);

	/* RedBoot also has an empty loop with 100000 iterations here -
	 * clock doesn't run yet */
	for (i = 0; i < 100000; i++)
		;

	/* Clear the reset, toggle the LEDs */
	writew(0xDF, CS4_BASE + 6);

	/* clock still doesn't run */
	for (i = 0; i < 100000; i++)
		;

	/* See 1.5.4 in IMX31ADSE_PERI_BUS_CNTRL_CPLD_RM.pdf */
	readb(CS4_BASE + 8);
	readb(CS4_BASE + 7);
	readb(CS4_BASE + 8);
	readb(CS4_BASE + 7);

	gd->bd->bi_arch_number = MACH_TYPE_MX31ADS;	/* board id for linux */
	gd->bd->bi_boot_params = 0x80000100;	/* adress of boot parameters */

	return 0;
}

int checkboard (void)
{
	printf("Board: MX31ADS\n");
	return 0;
}