mirror of
https://github.com/AsahiLinux/u-boot
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112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*
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* (C) Copyright 2000-2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Copyright (C) 2005-2008 Arthur Shipkowski (art@videon-central.com)
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/immap.h>
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#define PERIOD 13 /* system bus period in ns */
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#define SDRAM_TREFI 7800 /* in ns */
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int checkboard(void)
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{
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puts("Board: ");
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puts("Freescale MCF5275 EVB\n");
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return 0;
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};
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phys_size_t initdram(int board_type)
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{
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volatile sdramctrl_t *sdp = (sdramctrl_t *)(MMAP_SDRAM);
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volatile gpio_t *gpio_reg = (gpio_t *)(MMAP_GPIO);
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gpio_reg->par_sdram = 0x3FF; /* Enable SDRAM */
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/* Set up chip select */
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sdp->sdbar0 = CONFIG_SYS_SDRAM_BASE;
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sdp->sdbmr0 = MCF_SDRAMC_SDMRn_BAM_32M | MCF_SDRAMC_SDMRn_V;
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/* Set up timing */
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sdp->sdcfg1 = 0x83711630;
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sdp->sdcfg2 = 0x46770000;
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/* Enable clock */
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sdp->sdcr = MCF_SDRAMC_SDCR_MODE_EN | MCF_SDRAMC_SDCR_CKE;
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/* Set precharge */
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sdp->sdcr |= MCF_SDRAMC_SDCR_IPALL;
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/* Dummy write to start SDRAM */
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*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
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/* Send LEMR */
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sdp->sdmr = MCF_SDRAMC_SDMR_BNKAD_LEMR
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| MCF_SDRAMC_SDMR_AD(0x0)
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| MCF_SDRAMC_SDMR_CMD;
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*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
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/* Send LMR */
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sdp->sdmr = 0x058d0000;
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*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
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/* Stop sending commands */
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sdp->sdmr &= ~(MCF_SDRAMC_SDMR_CMD);
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/* Set precharge */
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sdp->sdcr |= MCF_SDRAMC_SDCR_IPALL;
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*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
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/* Stop manual precharge, send 2 IREF */
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sdp->sdcr &= ~(MCF_SDRAMC_SDCR_IPALL);
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sdp->sdcr |= MCF_SDRAMC_SDCR_IREF;
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*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
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*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
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/* Write mode register, clear reset DLL */
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sdp->sdmr = 0x018d0000;
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*((volatile unsigned long *)CONFIG_SYS_SDRAM_BASE) = 0xa5a59696;
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/* Stop sending commands */
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sdp->sdmr &= ~(MCF_SDRAMC_SDMR_CMD);
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sdp->sdcr &= ~(MCF_SDRAMC_SDCR_MODE_EN);
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/* Turn on auto refresh, lock SDMR */
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sdp->sdcr =
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MCF_SDRAMC_SDCR_CKE
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| MCF_SDRAMC_SDCR_REF
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| MCF_SDRAMC_SDCR_MUX(1)
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/* 1 added to round up */
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| MCF_SDRAMC_SDCR_RCNT((SDRAM_TREFI/(PERIOD*64)) - 1 + 1)
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| MCF_SDRAMC_SDCR_DQS_OE(0x3);
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return CONFIG_SYS_SDRAM_SIZE * 1024 * 1024;
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};
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int testdram(void)
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{
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/* TODO: XXX XXX XXX */
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printf("DRAM test not implemented!\n");
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return (0);
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}
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