/* * (C) Copyright 2007 * Stefan Roese, DENX Software Engineering, sr@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 <ppc4xx.h>#include <asm/processor.h>#include <asm/io.h>static void wait_init_complete(void){	u32 val;	do {		mfsdram(mem_mcsts, val);	} while (!(val & 0x80000000));}/* * early_sdram_init() * * As the name already indicates, this function is called very early * from start.S and configures the SDRAM with fixed values. This is needed, * since the 440EP has no internal SRAM and the 4kB NAND_SPL loader has * not enough free space to implement the complete I2C SPD DDR autodetection * routines. Therefore the Bamboo only supports the onboard 64MBytes of SDRAM * when booting from NAND flash. */void early_sdram_init(void){	/*	 * Soft-reset SDRAM controller.	 */	mtsdr(sdr_srst, SDR0_SRST_DMC);	mtsdr(sdr_srst, 0x00000000);	/*	 * Disable memory controller.	 */	mtsdram(mem_cfg0, 0x00000000);	/*	 * Setup some default	 */	mtsdram(mem_uabba, 0x00000000); /* ubba=0 (default)		*/	mtsdram(mem_slio, 0x00000000);	/* rdre=0 wrre=0 rarw=0		*/	mtsdram(mem_devopt, 0x00000000); /* dll=0 ds=0 (normal)		*/	mtsdram(mem_wddctr, 0x00000000); /* wrcp=0 dcd=0		*/	mtsdram(mem_clktr, 0x40000000); /* clkp=1 (90 deg wr) dcdt=0	*/	/*	 * Following for CAS Latency = 2.5 @ 133 MHz PLB	 */	mtsdram(mem_b0cr, 0x00082001);	mtsdram(mem_tr0, 0x41094012);	mtsdram(mem_tr1, 0x8080083d);	/* SS=T2 SL=STAGE 3 CD=1 CT=0x00*/	mtsdram(mem_rtr, 0x04100000);	/* Interval 7.8祍 @ 133MHz PLB	*/	mtsdram(mem_cfg1, 0x00000000);	/* Self-refresh exit, disable PM*/	/*	 * Enable the controller, then wait for DCEN to complete	 */	mtsdram(mem_cfg0, 0x80000000); /* DCEN=1, PMUD=0*/	wait_init_complete();}long int initdram(int board_type){	/*	 * Nothing to do here, just return size of fixed SDRAM setup	 */	return CFG_MBYTES_SDRAM << 20;}