Patch by Wolter Kamphuis, 05 Dec 2003:

Add support for SNMC's QS850/QS823/QS860T boards

1 files changed, 253 insertions, 0 deletions

diff --git a/board/snmc/qs850/qs850.c b/board/snmc/qs850/qs850.c
new file mode 100644
index 0000000..7448eb1
--- /dev/null
+++ b/board/snmc/qs850/qs850.c
@@ -0,0 +1,253 @@
+/*
+ * (C) Copyright 2003
+ * MuLogic B.V.
+ *
+ * (C) Copyright 2002
+ * Simple Network Magic Corporation, dnevil@snmc.com
+ *
+ * (C) Copyright 2000
+ * 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/u-boot.h>
+#include <commproc.h>
+#include "mpc8xx.h"
+
+/* ------------------------------------------------------------------------- */
+
+static long  int dram_size (long int, long int *, long int);
+
+/* ------------------------------------------------------------------------- */
+
+const uint sdram_table[] =
+{
+	/*
+	 * Single Read. (Offset 0 in UPMA RAM)
+	 */
+	0x0f07cc04,  0x00adcc04,  0x00a74c00,  0x00bfcc04,
+	0x1fffcc05,  0xffffcc05,  0xffffcc05,  0xffffcc05,
+	/*
+	 * Burst Read. (Offset 8 in UPMA RAM)
+	 */
+	0x0ff7fc04,  0x0ffffc04,  0x00bdfc04,  0x00fffc00,
+	0x00fffc00,  0x00fffc00,  0x0ff77c00,  0x1ffffc05,
+	0x1ffffc05,  0x1ffffc05,  0x1ffffc05,  0x1ffffc05,
+	0x1ffffc05,  0x1ffffc05,  0x1ffffc05,  0x1ffffc05,
+	/*
+	 * Single Write. (Offset 18 in UPMA RAM)
+	 */
+	0x0f07cc04,  0x0fafcc00,  0x01ad0c04,  0x1ff74c07,
+	0xffffcc05,  0xffffcc05,  0xffffcc05,  0xffffcc05,
+	/*
+	 * Burst Write. (Offset 20 in UPMA RAM)
+	 */
+	0x0ff7fc04,  0x0ffffc00,  0x00bd7c00,  0x00fffc00,
+	0x00fffc00,  0x00fffc00,  0x0ffffc04,  0x0ff77c04,
+	0x1ffffc05,  0x1ffffc05,  0x1ffffc05,  0x1ffffc05,
+	0x1ffffc05,  0x1ffffc05,  0x1ffffc05,  0x1ffffc05,
+	/*
+	 * Refresh  (Offset 30 in UPMA RAM)
+	 */
+	0xffffcc04,  0x1ff5cc84,  0xffffcc04,  0xffffcc04,
+	0xffffcc84,  0xffffcc05,  0xffffcc04,  0xffffcc04,
+	0xffffcc04,  0xffffcc04,  0xffffcc04,  0xffffcc04,
+	/*
+	 * Exception. (Offset 3c in UPMA RAM)
+	 */
+	0x1ff74c04,  0xffffcc07,  0xffffaa34,  0x1fb54a37
+};
+
+/* ------------------------------------------------------------------------- */
+
+
+/*
+ * Check Board Identity:
+ *
+ * Test ID string (QS850, QS823, ...)
+ *
+ * Always return 1
+ */
+
+int checkboard (void)
+{
+	unsigned char *s, *e;
+	unsigned char buf[64];
+	int i;
+
+	i = getenv_r("serial#", buf, sizeof(buf));
+	s = (i>0) ? buf : NULL;
+
+#ifdef CONFIG_QS850
+	if (!s || strncmp(s, "QS850", 5)) {
+		puts ("### No HW ID - assuming QS850");
+#endif
+#ifdef CONFIG_QS823
+	if (!s || strncmp(s, "QS823", 5)) {
+		puts ("### No HW ID - assuming QS823");
+#endif
+	} else {
+		for (e=s; *e; ++e) {
+		if (*e == ' ')
+		break;
+	}
+
+	for ( ; s<e; ++s) {
+		putc (*s);
+		}
+	}
+	putc ('\n');
+
+	return (0);
+}
+
+/* ------------------------------------------------------------------------- */
+/* SDRAM Mode Register Definitions */
+
+/* Set SDRAM Burst Length to 4 (010) */
+/* See Motorola MPC850 User Manual, Page 13-14 */
+#define SDRAM_BURST_LENGTH      (2)
+
+/* Set Wrap Type to Sequential (0) */
+/* See Motorola MPC850 User Manual, Page 13-14 */
+#define SDRAM_WRAP_TYPE         (0 << 3)
+
+/* Set /CAS Latentcy to 2 clocks */
+#define SDRAM_CAS_LATENTCY      (2 << 4)
+
+/* The Mode Register value must be shifted left by 2, since it is */
+/* placed on the address bus, and the 2 LSBs are ignored for 32-bit accesses */
+#define SDRAM_MODE_REG  ((SDRAM_BURST_LENGTH|SDRAM_WRAP_TYPE|SDRAM_CAS_LATENTCY) << 2)
+
+#define UPMA_RUN(loops,index)   (0x80002000 + (loops<<8) + index)
+
+/* Please note a value of zero = 16 loops */
+#define REFRESH_INIT_LOOPS (0)
+
+
+long int initdram (int board_type)
+{
+	volatile immap_t     *immap  = (immap_t *)CFG_IMMR;
+	volatile memctl8xx_t *memctl = &immap->im_memctl;
+	long int size;
+
+	upmconfig(UPMA, (uint *)sdram_table, sizeof(sdram_table)/sizeof(uint));
+
+	/*
+	* Prescaler for refresh
+	*/
+	memctl->memc_mptpr = CFG_MPTPR;
+
+	/*
+	* Map controller bank 1 to the SDRAM address
+	*/
+	memctl->memc_or1 = CFG_OR1;
+	memctl->memc_br1 = CFG_BR1;
+	udelay(1000);
+
+	/* perform SDRAM initialization sequence */
+	memctl->memc_mamr = CFG_16M_MAMR;
+	udelay(100);
+
+	/* Program the SDRAM's Mode Register */
+	memctl->memc_mar  = SDRAM_MODE_REG;
+
+	/* Run the Prechard Pattern at 0x3C */
+	memctl->memc_mcr  = UPMA_RUN(1,0x3c);
+	udelay(1);
+
+	/* Run the Refresh program residing at MAD index 0x30 */
+	/* This contains the CBR Refresh command with a loop */
+	/* The SDRAM must be refreshed at least 2 times */
+	/* Please note a value of zero = 16 loops */
+	memctl->memc_mcr  = UPMA_RUN(REFRESH_INIT_LOOPS,0x30);
+	udelay(1);
+
+	/* Run the Exception program residing at MAD index 0x3E */
+	/* This contains the Write Mode Register command */
+	/* The Write Mode Register command uses the value written to MAR */
+	memctl->memc_mcr  = UPMA_RUN(1,0x3e);
+
+	udelay (1000);
+
+	/*
+	* Check for 32M SDRAM Memory Size
+	*/
+	size = dram_size(CFG_32M_MAMR|MAMR_PTAE,
+	(ulong *)SDRAM_BASE, SDRAM_32M_MAX_SIZE);
+	udelay (1000);
+
+	/*
+	* Check for 16M SDRAM Memory Size
+	*/
+	if (size != SDRAM_32M_MAX_SIZE) {
+	size = dram_size(CFG_16M_MAMR|MAMR_PTAE,
+	(ulong *)SDRAM_BASE, SDRAM_16M_MAX_SIZE);
+	udelay (1000);
+	}
+
+	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;
+	long int cnt, val;
+
+	memctl->memc_mamr = mamr_value;
+
+	for (cnt = maxsize/sizeof(long); cnt > 0; cnt >>= 1) {
+		addr = base + cnt; /* pointer arith! */
+		*addr = ~cnt;
+	}
+
+	/* write 0 to base address */
+	addr = base;
+	*addr = 0;
+
+	/* check at base address */
+	if ((val = *addr) != 0) {
+		return (0);
+	}
+
+	for (cnt = 1; ; cnt <<= 1) {
+		addr = base + cnt; /* pointer arith! */
+		val = *addr;
+
+		if (val != (~cnt)) {
+			return (cnt * sizeof(long));
+		}
+	}
+	/* NOTREACHED */
+}