Initial revision

1 files changed, 246 insertions, 0 deletions

diff --git a/board/icu862/icu862.c b/board/icu862/icu862.c
new file mode 100644
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+/*
+ * (C) Copyright 2001
+ * 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 <config.h>
+#include <mpc8xx.h>
+
+/*
+ *  Memory Controller Using
+ *
+ *  CS0 - Flash memory            (0x40000000)
+ *  CS1 - SDRAM                   (0x00000000}
+ *  CS2 - S/UNI Ultra ATM155
+ *  CS3 - IDT 77106 ATM25
+ *  CS4 - DSP HPI
+ *  CS5 - E1/T1 Interface device
+ *  CS6 - PCMCIA device
+ *  CS7 - PCMCIA device
+ */
+
+/* ------------------------------------------------------------------------- */
+
+#define _not_used_	0xffffffff
+
+const uint sdram_table[] = {
+	/* single read. (offset 0 in upm RAM) */
+	0x1f07fc04, 0xeeaefc04, 0x11adfc04, 0xefbbbc00,
+	0x1ff77c47,
+
+	/* MRS initialization (offset 5) */
+
+	0x1ff77c34, 0xefeabc34, 0x1fb57c35,
+
+	/* burst read. (offset 8 in upm RAM) */
+	0x1f07fc04, 0xeeaefc04, 0x10adfc04, 0xf0affc00,
+	0xf0affc00, 0xf1affc00, 0xefbbbc00, 0x1ff77c47,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* single write. (offset 18 in upm RAM) */
+	0x1f27fc04, 0xeeaebc00, 0x01b93c04, 0x1ff77c47,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* burst write. (offset 20 in upm RAM) */
+	0x1f07fc04, 0xeeaebc00, 0x10ad7c00, 0xf0affc00,
+	0xf0affc00, 0xe1bbbc04, 0x1ff77c47, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* refresh. (offset 30 in upm RAM) */
+	0x1ff5fc84, 0xfffffc04, 0xfffffc04, 0xfffffc04,
+	0xfffffc84, 0xfffffc07, _not_used_, _not_used_,
+	_not_used_, _not_used_, _not_used_, _not_used_,
+
+	/* exception. (offset 3c in upm RAM) */
+	0x7ffffc07, _not_used_, _not_used_, _not_used_
+};
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * Check Board Identity:
+ */
+
+int checkboard (void)
+{
+	puts ("Board: ICU862 Board\n");
+	return 0;
+}
+
+/* ------------------------------------------------------------------------- */
+
+static long int dram_size (long int, long int *, long int);
+
+/* ------------------------------------------------------------------------- */
+
+long int initdram (int board_type)
+{
+	volatile immap_t *immap = (immap_t *) CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	long int size8, size9;
+	long int size_b0 = 0;
+	unsigned long reg;
+
+	upmconfig (UPMA, (uint *) sdram_table,
+			   sizeof (sdram_table) / sizeof (uint));
+
+	/*
+	 * Preliminary prescaler for refresh (depends on number of
+	 * banks): This value is selected for four cycles every 62.4 us
+	 * with two SDRAM banks or four cycles every 31.2 us with one
+	 * bank. It will be adjusted after memory sizing.
+	 */
+	memctl->memc_mptpr = CFG_MPTPR_2BK_8K;
+
+	memctl->memc_mar = 0x00000088;
+
+	/*
+	 * Map controller bank 1 to the SDRAM bank at
+	 * preliminary address - these have to be modified after the
+	 * SDRAM size has been determined.
+	 */
+	memctl->memc_or1 = CFG_OR1_PRELIM;
+	memctl->memc_br1 = CFG_BR1_PRELIM;
+
+	memctl->memc_mamr = CFG_MAMR_8COL & (~(MAMR_PTAE));	/* no refresh yet */
+
+	udelay (200);
+
+	/* perform SDRAM initializsation sequence */
+
+	memctl->memc_mcr = 0x80002105;	/* SDRAM bank 0 */
+	udelay (200);
+	memctl->memc_mcr = 0x80002230;	/* SDRAM bank 0 - execute twice */
+	udelay (200);
+
+	memctl->memc_mamr |= MAMR_PTAE;	/* enable refresh */
+
+	udelay (1000);
+
+	/*
+	 * Check Bank 0 Memory Size for re-configuration
+	 *
+	 * try 8 column mode
+	 */
+	size8 = dram_size (CFG_MAMR_8COL, (ulong *) SDRAM_BASE1_PRELIM,
+					   SDRAM_MAX_SIZE);
+
+	udelay (1000);
+
+	/*
+	 * try 9 column mode
+	 */
+	size9 = dram_size (CFG_MAMR_9COL, (ulong *) SDRAM_BASE1_PRELIM,
+					   SDRAM_MAX_SIZE);
+
+	if (size8 < size9) {		/* leave configuration at 9 columns */
+		size_b0 = size9;
+/*	debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20);	*/
+	} else {					/* back to 8 columns            */
+		size_b0 = size8;
+		memctl->memc_mamr = CFG_MAMR_8COL;
+		udelay (500);
+/*	debug ("SDRAM Bank 0 in 8 column mode: %ld MB\n", size >> 20);	*/
+	}
+
+	udelay (1000);
+
+	/*
+	 * Adjust refresh rate depending on SDRAM type, both banks
+	 * For types > 128 MBit leave it at the current (fast) rate
+	 */
+	if ((size_b0 < 0x02000000)) {
+		/* reduce to 15.6 us (62.4 us / quad) */
+		memctl->memc_mptpr = CFG_MPTPR_2BK_4K;
+		udelay (1000);
+	}
+
+	/*
+	 * Final mapping
+	 */
+
+	memctl->memc_or1 = ((-size_b0) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
+	memctl->memc_br1 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
+
+	/* adjust refresh rate depending on SDRAM type, one bank */
+	reg = memctl->memc_mptpr;
+	reg >>= 1;					/* reduce to CFG_MPTPR_1BK_8K / _4K */
+	memctl->memc_mptpr = reg;
+
+	udelay (10000);
+
+	return (size_b0);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * Check memory range for valid RAM. A simple memory test determines
+ * the actually available RAM size between addresses `base' and
+ * `base + maxsize'. Some (not all) hardware errors are detected:
+ * - short between address lines
+ * - short between data lines
+ */
+
+static long int dram_size (long int mamr_value, long int *base,
+						   long int maxsize)
+{
+	volatile immap_t *immap = (immap_t *) CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	volatile long int *addr;
+	ulong cnt, val;
+	ulong save[32];				/* to make test non-destructive */
+	unsigned char i = 0;
+
+	memctl->memc_mamr = mamr_value;
+
+	for (cnt = maxsize / sizeof (long); cnt > 0; cnt >>= 1) {
+		addr = base + cnt;		/* pointer arith! */
+
+		save[i++] = *addr;
+		*addr = ~cnt;
+	}
+
+	/* write 0 to base address */
+	addr = base;
+	save[i] = *addr;
+	*addr = 0;
+
+	/* check at base address */
+	if ((val = *addr) != 0) {
+		*addr = save[i];
+		return (0);
+	}
+
+	for (cnt = 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
+		addr = base + cnt;		/* pointer arith! */
+		val = *addr;
+		*addr = save[--i];
+
+		if (val != (~cnt)) {
+			return (cnt * sizeof (long));
+		}
+	}
+	return (maxsize);
+}