ColdFire: Add M5235EVB Platform for MCF523x

Signed-off-by: TsiChungLiew <Tsi-Chung.Liew@freescale.com>

1 files changed, 117 insertions, 0 deletions

diff --git a/board/freescale/m5235evb/m5235evb.c b/board/freescale/m5235evb/m5235evb.c
new file mode 100644
index 0000000..585854c
--- /dev/null
+++ b/board/freescale/m5235evb/m5235evb.c
@@ -0,0 +1,117 @@
+/*
+ * (C) Copyright 2000-2003
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
+ * TsiChung Liew (Tsi-Chung.Liew@freescale.com)
+ *
+ * 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 <config.h>
+#include <common.h>
+#include <asm/immap.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+int checkboard(void)
+{
+	puts("Board: ");
+	puts("Freescale M5235 EVB\n");
+	return 0;
+};
+
+long int initdram(int board_type)
+{
+	volatile sdram_t *sdram = (volatile sdram_t *)(MMAP_SDRAM);
+	volatile gpio_t *gpio = (volatile gpio_t *)(MMAP_GPIO);
+	u32 dramsize, i, dramclk;
+
+	/*
+	 * When booting from external Flash, the port-size is less than
+	 * the port-size of SDRAM.  In this case it is necessary to enable
+	 * Data[15:0] on Port Address/Data.
+	 */
+	gpio->par_ad =
+	    GPIO_PAR_AD_ADDR23 | GPIO_PAR_AD_ADDR22 | GPIO_PAR_AD_ADDR21 |
+	    GPIO_PAR_AD_DATAL;
+
+	/* Initialize PAR to enable SDRAM signals */
+	gpio->par_sdram =
+	    GPIO_PAR_SDRAM_SDWE | GPIO_PAR_SDRAM_SCAS | GPIO_PAR_SDRAM_SRAS |
+	    GPIO_PAR_SDRAM_SCKE | GPIO_PAR_SDRAM_SDCS(3);
+
+	dramsize = CFG_SDRAM_SIZE * 0x100000;
+	for (i = 0x13; i < 0x20; i++) {
+		if (dramsize == (1 << i))
+			break;
+	}
+	i--;
+
+	if (!(sdram->dacr0 & SDRAMC_DARCn_RE)) {
+		dramclk = gd->bus_clk / (CFG_HZ * CFG_HZ);
+
+		/* Initialize DRAM Control Register: DCR */
+		sdram->dcr = SDRAMC_DCR_RTIM_9CLKS |
+		    SDRAMC_DCR_RTIM_6CLKS | SDRAMC_DCR_RC((15 * dramclk) >> 4);
+
+		/* Initialize DACR0 */
+		sdram->dacr0 =
+		    SDRAMC_DARCn_BA(CFG_SDRAM_BASE) | SDRAMC_DARCn_CASL_C1 |
+		    SDRAMC_DARCn_CBM_CMD20 | SDRAMC_DARCn_PS_32;
+
+		/* Initialize DMR0 */
+		sdram->dmr0 = ((dramsize - 1) & 0xFFFC0000) | SDRAMC_DMRn_V;
+
+		/* Set IP (bit 3) in DACR */
+		sdram->dacr0 |= SDRAMC_DARCn_IP;
+
+		/* Wait 30ns to allow banks to precharge */
+		for (i = 0; i < 5; i++) {
+			asm("nop");
+		}
+
+		/* Write to this block to initiate precharge */
+		*(u32 *) (CFG_SDRAM_BASE) = 0xA5A59696;
+
+		/*  Set RE (bit 15) in DACR */
+		sdram->dacr0 |= SDRAMC_DARCn_RE;
+
+		/* Wait for at least 8 auto refresh cycles to occur */
+		for (i = 0; i < 0x2000; i++) {
+			asm("nop");
+		}
+
+		/* Finish the configuration by issuing the MRS. */
+		sdram->dacr0 |= SDRAMC_DARCn_IMRS;
+
+		/* Write to the SDRAM Mode Register */
+		*(u32 *) (CFG_SDRAM_BASE + 0x400) = 0xA5A59696;
+	}
+
+	return dramsize;
+};
+
+int testdram(void)
+{
+	/* TODO: XXX XXX XXX */
+	printf("DRAM test not implemented!\n");
+
+	return (0);
+}