Add M5271EVB board support.

1 files changed, 125 insertions, 0 deletions

diff --git a/board/m5271evb/m5271evb.c b/board/m5271evb/m5271evb.c
new file mode 100644
index 0000000..d364bd6
--- /dev/null
+++ b/board/m5271evb/m5271evb.c
@@ -0,0 +1,125 @@
+/*
+ * (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);
+}