r5200.c

u-boot-1.1.6 源码包

/*
 * (C) Copyright 2000-2003
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * 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/m5271.h>
#include <asm/immap_5271.h>


int checkboard (void) {
	puts ("Board: R5200 Ethernet Module\n");
	return 0;
};

long int initdram (int board_type) {
	int i;

	/*
	 *  Set CS2 pin to be SD_CS0
	 */
	mbar_writeByte(MCF_GPIO_PAR_CS, mbar_readByte(MCF_GPIO_PAR_CS)
			| MCF_GPIO_PAR_CS_PAR_CS2);

	mbar_writeByte(MCF_GPIO_PAR_SDRAM, mbar_readByte(MCF_GPIO_PAR_SDRAM)
			| MCF_GPIO_PAR_SDRAM_PAR_CSSDCS(0x01));

	/*
	 * Check to see if the SDRAM has already been initialized
	 * by a run control tool
	 */
	if (!(mbar_readLong(MCF_SDRAMC_DACR0) & MCF_SDRAMC_DACRn_RE)) {
		/*
		 * Initialize DRAM Control Register: DCR
		 */
		mbar_writeShort(MCF_SDRAMC_DCR, MCF_SDRAMC_DCR_RTIM(0x01)
				| MCF_SDRAMC_DCR_RC(0x30));

		/*
		 * Initialize DACR0
		 */
		mbar_writeLong(MCF_SDRAMC_DACR0,
				MCF_SDRAMC_DACRn_BA(CFG_SDRAM_BASE>>18)
				| MCF_SDRAMC_DACRn_CASL(0)
				| MCF_SDRAMC_DACRn_CBM(3)
				| MCF_SDRAMC_DACRn_PS(2));

		/*
		 * Initialize DMR0
		 */
		mbar_writeLong(MCF_SDRAMC_DMR0,
				MCF_SDRAMC_DMRn_BAM_8M
				| MCF_SDRAMC_DMRn_V);

		/*
		 * Set IP bit in DACR
		 */
		mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0)
				| MCF_SDRAMC_DACRn_IP);

		/*
		 * Wait at least 20ns to allow banks to precharge
		 */
		for (i = 0; i < 5; i++)
			asm(" nop");

		/*
		 * Write to this block to initiate precharge
		 */
		*(u16 *)(CFG_SDRAM_BASE) = 0x9696;

		/*
		 * Set RE bit in DACR
		 */
		mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0)
				| MCF_SDRAMC_DACRn_RE);


		/*
		 * Wait for at least 8 auto refresh cycles to occur
		 */
		for (i = 0; i < 2000; i++)
			asm(" nop");

		/*
		 * Finish the configuration by issuing the MRS.
		 */
		mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0)
				| MCF_SDRAMC_DACRn_MRS);


		/*
		 * Write to the SDRAM Mode Register
		 */
		*(u16 *)(CFG_SDRAM_BASE + 0x1000) = 0x9696;
	}

	return CFG_SDRAM_SIZE * 1024 * 1024;
};

int testdram (void) {
	/* TODO: XXX XXX XXX */
	printf ("DRAM test not implemented!\n");

	return (0);
}