Initial revision

board/RRvision/RRvision.c

+/*
+ * (C) Copyright 2001-2002
+ * 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 <mpc8xx.h>
+
+/* ------------------------------------------------------------------------- */
+
+static long int dram_size (long int, long int *, long int);
+
+/* ------------------------------------------------------------------------- */
+
+#define	_NOT_USED_	0xFFFFFFFF
+
+const uint sdram_table[] =
+{
+	/*
+	 * Single Read. (Offset 0 in UPMA RAM)
+	 */
+	0x1F07FC04, 0xEEAEFC04, 0x11ADFC04, 0xEFBBBC00,
+	0x1FF77C47, /* last */
+	/*
+	 * SDRAM Initialization (offset 5 in UPMA RAM)
+	 *
+	 * This is no UPM entry point. The following definition uses
+	 * the remaining space to establish an initialization
+	 * sequence, which is executed by a RUN command.
+	 *
+	 */
+		    0x1FF77C34, 0xEFEABC34, 0x1FB57C35, /* last */
+	/*
+	 * Burst Read. (Offset 8 in UPMA RAM)
+	 */
+	0x1F07FC04, 0xEEAEFC04, 0x10ADFC04, 0xF0AFFC00,
+	0xF0AFFC00, 0xF1AFFC00, 0xEFBBBC00, 0x1FF77C47, /* last */
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	/*
+	 * Single Write. (Offset 18 in UPMA RAM)
+	 */
+	0x1F07FC04, 0xEEAEBC00, 0x01B93C04, 0x1FF77C47, /* last */
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	/*
+	 * Burst Write. (Offset 20 in UPMA RAM)
+	 */
+	0x1F07FC04, 0xEEAEBC00, 0x10AD7C00, 0xF0AFFC00,
+	0xF0AFFC00, 0xE1BBBC04, 0x1FF77C47, /* last */
+					    _NOT_USED_,
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	/*
+	 * Refresh  (Offset 30 in UPMA RAM)
+	 */
+	0x1FF5FC84, 0xFFFFFC04, 0xFFFFFC04, 0xFFFFFC04,
+	0xFFFFFC84, 0xFFFFFC07, /* last */
+				_NOT_USED_, _NOT_USED_,
+	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
+	/*
+	 * Exception. (Offset 3c in UPMA RAM)
+	 */
+	0x7FFFFC07, /* last */
+		    _NOT_USED_, _NOT_USED_, _NOT_USED_,
+};
+
+/* ------------------------------------------------------------------------- */
+
+
+/*
+ * Check Board Identity:
+ *
+ * Always return 1 (no second DRAM bank).
+ */
+
+int checkboard (void)
+{
+	unsigned char *s = getenv ("serial#");
+
+	puts ("Board: RRvision ");
+
+	for (; s && *s; ++s) {
+		if (*s == ' ')
+			break;
+		putc (*s);
+	}
+
+	putc ('\n');
+
+	return (0);
+}
+
+/* ------------------------------------------------------------------------- */
+
+long int initdram (int board_type)
+{
+	volatile immap_t *immap = (immap_t *) CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	unsigned long reg;
+	long int size8, size9;
+	long int size = 0;
+
+	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 the SDRAM bank 2 at physical address 0.
+	 */
+	memctl->memc_or1 = CFG_OR2_PRELIM;
+	memctl->memc_br1 = CFG_BR2_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 (1);
+	memctl->memc_mcr = 0x80002230;	/* SDRAM bank 0 - execute twice */
+	udelay (1);
+
+	memctl->memc_mamr |= MAMR_PTAE;	/* enable refresh */
+
+	udelay (1000);
+
+	/*
+	 * Check Bank 0 Memory Size
+	 *
+	 * try 8 column mode
+	 */
+	size8 = dram_size (CFG_MAMR_8COL,
+			   (ulong *)SDRAM_BASE2_PRELIM,
+			   SDRAM_MAX_SIZE);
+
+	udelay (1000);
+
+	/*
+	 * try 9 column mode
+	 */
+	size9 = dram_size (CFG_MAMR_9COL,
+			   (ulong *) SDRAM_BASE2_PRELIM,
+			   SDRAM_MAX_SIZE);
+
+	if (size8 < size9) {		/* leave configuration at 9 columns */
+		size = size9;
+/*		debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20);	*/
+	} else {			/* back to 8 columns            */
+		size = 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
+	 * For types > 128 MBit leave it at the current (fast) rate
+	 */
+	if (size < 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) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
+	memctl->memc_br1 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
+
+	/*
+	 * No bank 1
+	 *
+	 * invalidate bank
+	 */
+	memctl->memc_br3 = 0;
+
+	/* 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);
+}
+
+/* ------------------------------------------------------------------------- */
+
+/*
+ * 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);
+}