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-rw-r--r--cpu/ppc4xx/sdram.c191
1 files changed, 191 insertions, 0 deletions
diff --git a/cpu/ppc4xx/sdram.c b/cpu/ppc4xx/sdram.c
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+/*
+ * (C) Copyright 2002
+ * Stefan Roese, esd gmbh germany, stefan.roese@esd-electronics.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 <common.h>
+#include <ppc4xx.h>
+#include <asm/processor.h>
+#include <pci.h>
+
+
+#ifdef CONFIG_SDRAM_BANK0
+
+
+#define MAGIC0 0x00000000
+#define MAGIC1 0x11111111
+#define MAGIC2 0x22222222
+#define MAGIC3 0x33333333
+#define MAGIC4 0x44444444
+
+#define ADDR_ZERO 0x00000000
+#define ADDR_400 0x00000400
+#define ADDR_08MB 0x00800000
+#define ADDR_16MB 0x01000000
+#define ADDR_32MB 0x02000000
+#define ADDR_64MB 0x04000000
+
+#define mtsdram0(reg, data) mtdcr(memcfga,reg);mtdcr(memcfgd,data)
+
+
+/*-----------------------------------------------------------------------
+ */
+void sdram_init(void)
+{
+ ulong speed;
+ ulong sdtr1;
+ ulong rtr;
+
+ /*
+ * Determine SDRAM speed
+ */
+ speed = get_bus_freq(0); /* parameter not used on ppc4xx */
+
+ /*
+ * Support for 100MHz and 133MHz SDRAM
+ */
+ if (speed > 100000000) {
+ /*
+ * 133 MHz SDRAM
+ */
+ sdtr1 = 0x01074015;
+ rtr = 0x07f00000;
+ } else {
+ /*
+ * default: 100 MHz SDRAM
+ */
+ sdtr1 = 0x0086400d;
+ rtr = 0x05f00000;
+ }
+
+ /*
+ * Set MB0CF for bank 0. (0-64MB) Address Mode 3 since 13x9(4)
+ */
+ mtsdram0(mem_mb0cf, 0x00084001);
+
+ mtsdram0(mem_sdtr1, sdtr1);
+ mtsdram0(mem_rtr, rtr);
+
+ /*
+ * Wait for 200us
+ */
+ udelay(200);
+
+ /*
+ * Set memory controller options reg, MCOPT1.
+ * Set DC_EN to '1' and BRD_PRF to '01' for 16 byte PLB Burst
+ * read/prefetch.
+ */
+ mtsdram0(mem_mcopt1, 0x80800000);
+
+ /*
+ * Wait for 10ms
+ */
+ udelay(10000);
+
+ /*
+ * Test if 64 MByte are equipped (mirror test)
+ */
+ *(volatile ulong *)ADDR_ZERO = MAGIC0;
+ *(volatile ulong *)ADDR_08MB = MAGIC1;
+ *(volatile ulong *)ADDR_16MB = MAGIC2;
+ *(volatile ulong *)ADDR_32MB = MAGIC3;
+
+ if ((*(volatile ulong *)ADDR_ZERO == MAGIC0) &&
+ (*(volatile ulong *)ADDR_08MB == MAGIC1) &&
+ (*(volatile ulong *)ADDR_16MB == MAGIC2)) {
+ /*
+ * OK, 64MB detected -> all done
+ */
+ return;
+ }
+
+ /*
+ * Now test for 32 MByte...
+ */
+
+ /*
+ * Disable memory controller.
+ */
+ mtsdram0(mem_mcopt1, 0x00000000);
+
+ /*
+ * Set MB0CF for bank 0. (0-32MB) Address Mode 2 since 12x9(4)
+ */
+ mtsdram0(mem_mb0cf, 0x00062001);
+
+ /*
+ * Set memory controller options reg, MCOPT1.
+ * Set DC_EN to '1' and BRD_PRF to '01' for 16 byte PLB Burst
+ * read/prefetch.
+ */
+ mtsdram0(mem_mcopt1, 0x80800000);
+
+ /*
+ * Wait for 10ms
+ */
+ udelay(10000);
+
+ /*
+ * Test if 32 MByte are equipped (mirror test)
+ */
+ *(volatile ulong *)ADDR_ZERO = MAGIC0;
+ *(volatile ulong *)ADDR_400 = MAGIC1;
+ *(volatile ulong *)ADDR_08MB = MAGIC2;
+ *(volatile ulong *)ADDR_16MB = MAGIC3;
+
+ if ((*(volatile ulong *)ADDR_ZERO == MAGIC0) &&
+ (*(volatile ulong *)ADDR_400 == MAGIC1) &&
+ (*(volatile ulong *)ADDR_08MB == MAGIC2)) {
+ /*
+ * OK, 32MB detected -> all done
+ */
+ return;
+ }
+
+ /*
+ * Setup for 16 MByte...
+ */
+
+ /*
+ * Disable memory controller.
+ */
+ mtsdram0(mem_mcopt1, 0x00000000);
+
+ /*
+ * Set MB0CF for bank 0. (0-16MB) Address Mode 4 since 12x8(4)
+ */
+ mtsdram0(mem_mb0cf, 0x00046001);
+
+ /*
+ * Set memory controller options reg, MCOPT1.
+ * Set DC_EN to '1' and BRD_PRF to '01' for 16 byte PLB Burst
+ * read/prefetch.
+ */
+ mtsdram0(mem_mcopt1, 0x80800000);
+
+ /*
+ * Wait for 10ms
+ */
+ udelay(10000);
+}
+
+#endif /* CONFIG_SDRAM_BANK0 */