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authorWolfgang Denk <wd@pollux.denx.de>2006-05-09 13:46:55 +0200
committerWolfgang Denk <wd@pollux.denx.de>2006-05-09 13:46:55 +0200
commit1cfefe8cb6e1bb43f6509c0aee254e2908d42f21 (patch)
treeeba45129d65b83452d281514802f3895aa4f283e /board/m5271evb/m5271evb.c
parent67a94685225b289fb3344cf00fefa91fd93f24ae (diff)
parent78b123cd69d485887f33ebd33ba1f9b27f8e6916 (diff)
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Merge with /home/m8/git/u-boot
Diffstat (limited to 'board/m5271evb/m5271evb.c')
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1 files changed, 125 insertions, 0 deletions
diff --git a/board/m5271evb/m5271evb.c b/board/m5271evb/m5271evb.c
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+++ b/board/m5271evb/m5271evb.c
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+/*
+ * (C) Copyright 2000-2006
+ * Wolfgang Denk, DENX Software Engineering, wd@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/m5271.h>
+#include <asm/immap_5271.h>
+
+int checkboard (void) {
+ puts ("Board: Freescale M5271EVB\n");
+ return 0;
+};
+
+long int initdram (int board_type) {
+
+ int i;
+
+ /* Enable Address lines 23-21 and lower 16bits of data path */
+ mbar_writeByte(MCF_GPIO_PAR_AD, MCF_GPIO_AD_ADDR23 |
+ MCF_GPIO_AD_ADDR22 | MCF_GPIO_AD_ADDR21 |
+ MCF_GPIO_AD_DATAL);
+
+ /* 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);
+
+ /* Configure SDRAM Control Pin Assignemnt Register */
+ mbar_writeByte(MCF_GPIO_PAR_SDRAM, MCF_GPIO_SDRAM_CSSDCS_00 |
+ MCF_GPIO_SDRAM_SDWE | MCF_GPIO_SDRAM_SCAS |
+ MCF_GPIO_SDRAM_SRAS | MCF_GPIO_SDRAM_SCKE |
+ MCF_GPIO_SDRAM_SDCS_11);
+
+ /*
+ * 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
+ *
+ * CASL: 01
+ * CBM: cmd at A20, bank select bits 21 and up
+ * PS: 32bit port size
+ */
+ mbar_writeLong(MCF_SDRAMC_DACR0,
+ MCF_SDRAMC_DACRn_BA(CFG_SDRAM_BASE>>18)
+ | MCF_SDRAMC_DACRn_CASL(1)
+ | MCF_SDRAMC_DACRn_CBM(3)
+ | MCF_SDRAMC_DACRn_PS(0));
+
+ /* Initialize DMR0 */
+ mbar_writeLong(MCF_SDRAMC_DMR0,
+ MCF_SDRAMC_DMRn_BAM_16M
+ | 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 */
+ *(u32 *)(CFG_SDRAM_BASE) = 0xa5a5a5a5;
+
+ /* 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 A0-A11 = 0x400
+ *
+ * Write Burst Mode = Programmed Burst Length
+ * Op Mode = Standard Op
+ * CAS Latency = 2
+ * Burst Type = Sequential
+ * Burst Length = 1
+ */
+ *(u32 *)(CFG_SDRAM_BASE + 0x400) = 0xa5a5a5a5;
+ }
+
+ return CFG_SDRAM_SIZE * 1024 * 1024;
+};
+
+int testdram (void) {
+
+ /* TODO: XXX XXX XXX */
+ printf ("DRAM test not implemented!\n");
+
+ return (0);
+}