Merge the new NAND code (testing-NAND brach); see doc/README.nand

Rewrite of NAND code based on what is in 2.6.12 Linux kernel
Patch by Ladislav Michl, 29 Jun 2005

[Merge with /home/tur/nand/u-boot]

1 files changed, 343 insertions, 0 deletions

diff --git a/board/netstar/flash.c b/board/netstar/flash.c
new file mode 100644
index 0000000..f555c0c
--- /dev/null
+++ b/board/netstar/flash.c
@@ -0,0 +1,343 @@
+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Alex Zuepke <azu@sysgo.de>
+ *
+ * (C) Copyright 2005
+ * 2N Telekomunikace, a.s. <www.2n.cz>
+ * Ladislav Michl <michl@2n.cz>
+ *
+ * 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>
+
+/*#if 0 */
+#if (PHYS_SDRAM_1_SIZE != SZ_32M)
+
+#include "crcek.h"
+
+#if (CFG_MAX_FLASH_BANKS > 1)
+#error There is always only _one_ flash chip
+#endif
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
+
+#define CMD_READ_ARRAY		0x000000f0
+#define CMD_UNLOCK1		0x000000aa
+#define CMD_UNLOCK2		0x00000055
+#define CMD_ERASE_SETUP		0x00000080
+#define CMD_ERASE_CONFIRM	0x00000030
+#define CMD_PROGRAM		0x000000a0
+#define CMD_UNLOCK_BYPASS	0x00000020
+
+#define MEM_FLASH_ADDR1		(*(volatile u16 *)(CFG_FLASH_BASE + (0x00000555 << 1)))
+#define MEM_FLASH_ADDR2		(*(volatile u16 *)(CFG_FLASH_BASE + (0x000002aa << 1)))
+
+#define BIT_ERASE_DONE		0x00000080
+#define BIT_RDY_MASK		0x00000080
+#define BIT_PROGRAM_ERROR	0x00000020
+#define BIT_TIMEOUT		0x80000000	/* our flag */
+
+/*-----------------------------------------------------------------------
+ */
+
+ulong flash_init(void)
+{
+	int i;
+
+	flash_info[0].flash_id = (AMD_MANUFACT & FLASH_VENDMASK) |
+				 (AMD_ID_LV800B & FLASH_TYPEMASK);
+	flash_info[0].size = PHYS_FLASH_1_SIZE;
+	flash_info[0].sector_count = CFG_MAX_FLASH_SECT;
+	memset(flash_info[0].protect, 0, CFG_MAX_FLASH_SECT);
+
+	for (i = 0; i < flash_info[0].sector_count; i++) {
+		switch (i) {
+		case 0: /* 16kB */
+			flash_info[0].start[0] = CFG_FLASH_BASE;
+			break;
+		case 1: /* 8kB */
+			flash_info[0].start[1] = CFG_FLASH_BASE + 0x4000;
+			break;
+		case 2: /* 8kB */
+			flash_info[0].start[2] = CFG_FLASH_BASE + 0x4000 +
+						 0x2000;
+			break;
+		case 3: /* 32 KB */
+			flash_info[0].start[3] = CFG_FLASH_BASE + 0x4000 +
+						 2 * 0x2000;
+			break;
+		case 4:
+			flash_info[0].start[4] = CFG_FLASH_BASE + 0x4000 +
+						 2 * 0x2000 + 0x8000;
+			break;
+		default: /* 64kB */
+			flash_info[0].start[i] = flash_info[0].start[i-1] +
+						 0x10000;
+			break;
+		}
+	}
+
+	/* U-Boot */
+	flash_protect(FLAG_PROTECT_SET,
+		      LOADER1_OFFSET,
+		      LOADER1_OFFSET + LOADER_SIZE - 1, flash_info);
+	/* Protect crcek, env and r_env as well */
+	flash_protect(FLAG_PROTECT_SET, 0, 0x8000 - 1, flash_info);
+
+	return flash_info[0].size;
+}
+
+/*-----------------------------------------------------------------------
+ */
+void flash_print_info(flash_info_t *info)
+{
+	int i;
+
+	switch (info->flash_id & FLASH_VENDMASK) {
+	case (AMD_MANUFACT & FLASH_VENDMASK):
+		puts("AMD: ");
+		break;
+	default:
+		puts("Unknown vendor ");
+		break;
+	}
+
+	switch (info->flash_id & FLASH_TYPEMASK) {
+	case (AMD_ID_LV800B & FLASH_TYPEMASK):
+		puts("AM29LV800BB (8Mb)\n");
+		break;
+	default:
+		puts("Unknown chip type\n");
+		return;
+	}
+
+	printf("  Size: %ld MB in %d sectors\n",
+	       info->size >> 20, info->sector_count);
+
+	puts("  Sector start addresses:");
+	for (i = 0; i < info->sector_count; i++) {
+		if ((i % 5) == 0)
+			puts("\n   ");
+
+		printf(" %08lX%s", info->start[i],
+		       info->protect[i] ? " (RO)" : "     ");
+	}
+	puts("\n");
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+int flash_erase(flash_info_t *info, int s_first, int s_last)
+{
+	ushort result;
+	int prot, sect;
+	int rc = ERR_OK;
+
+	/* first look for protection bits */
+
+	if (info->flash_id == FLASH_UNKNOWN)
+		return ERR_UNKNOWN_FLASH_TYPE;
+
+	if ((s_first < 0) || (s_first > s_last))
+		return ERR_INVAL;
+
+	if ((info->flash_id & FLASH_VENDMASK) !=
+	    (AMD_MANUFACT & FLASH_VENDMASK))
+		return ERR_UNKNOWN_FLASH_VENDOR;
+
+	prot = 0;
+	for (sect = s_first; sect <= s_last; ++sect)
+		if (info->protect[sect])
+			prot++;
+
+	if (prot)
+		printf("- Warning: %d protected sectors will not be erased!\n",
+		       prot);
+	else
+		putc('\n');
+
+	/* Start erase on unprotected sectors */
+	for (sect = s_first; sect <= s_last && !ctrlc (); sect++) {
+		if (info->protect[sect] == 0) {	/* not protected */
+			vu_short *addr = (vu_short *) (info->start[sect]);
+
+			/* arm simple, non interrupt dependent timer */
+			reset_timer_masked();
+
+			MEM_FLASH_ADDR1 = CMD_UNLOCK1;
+			MEM_FLASH_ADDR2 = CMD_UNLOCK2;
+			MEM_FLASH_ADDR1 = CMD_ERASE_SETUP;
+
+			MEM_FLASH_ADDR1 = CMD_UNLOCK1;
+			MEM_FLASH_ADDR2 = CMD_UNLOCK2;
+			*addr = CMD_ERASE_CONFIRM;
+
+			/* wait until flash is ready */
+			while (1) {
+				result = *addr;
+
+				/* check timeout */
+				if (get_timer_masked() > CFG_FLASH_ERASE_TOUT) {
+					MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
+					rc = ERR_TIMOUT;
+					break;
+				}
+
+				if ((result & 0xfff) & BIT_ERASE_DONE)
+					break;
+
+				if ((result & 0xffff) & BIT_PROGRAM_ERROR) {
+					rc = ERR_PROG_ERROR;
+					break;
+				}
+			}
+
+			MEM_FLASH_ADDR1 = CMD_READ_ARRAY;
+
+			if (rc != ERR_OK)
+				goto out;
+
+			putc('.');
+		}
+	}
+out:
+	/* allow flash to settle - wait 10 ms */
+	udelay_masked(10000);
+
+	return rc;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash
+ */
+
+volatile static int write_hword(flash_info_t *info, ulong dest, ushort data)
+{
+	vu_short *addr = (vu_short *) dest;
+	ushort result;
+	int rc = ERR_OK;
+
+	/* check if flash is (sufficiently) erased */
+	result = *addr;
+	if ((result & data) != data)
+		return ERR_NOT_ERASED;
+
+	MEM_FLASH_ADDR1 = CMD_UNLOCK1;
+	MEM_FLASH_ADDR2 = CMD_UNLOCK2;
+	MEM_FLASH_ADDR1 = CMD_PROGRAM;
+	*addr = data;
+
+	/* arm simple, non interrupt dependent timer */
+	reset_timer_masked();
+
+	/* wait until flash is ready */
+	while (1) {
+		result = *addr;
+
+		/* check timeout */
+		if (get_timer_masked () > CFG_FLASH_ERASE_TOUT) {
+			rc = ERR_TIMOUT;
+			break;
+		}
+
+		if ((result & 0x80) == (data & 0x80))
+			break;
+
+		if ((result & 0xffff) & BIT_PROGRAM_ERROR) {
+			result = *addr;
+
+			if ((result & 0x80) != (data & 0x80))
+				rc = ERR_PROG_ERROR;
+		}
+	}
+
+	*addr = CMD_READ_ARRAY;
+
+	if (*addr != data)
+		rc = ERR_PROG_ERROR;
+
+	return rc;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash.
+ */
+
+int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+	ulong cp, wp;
+	int l;
+	int i, rc;
+	ushort data;
+
+	wp = (addr & ~1);	/* get lower word aligned address */
+
+	/*
+	 * handle unaligned start bytes
+	 */
+	if ((l = addr - wp) != 0) {
+		data = 0;
+		for (i = 0, cp = wp; i < l; ++i, ++cp)
+			data = (data >> 8) | (*(uchar *) cp << 8);
+		for (; i < 2 && cnt > 0; ++i) {
+			data = (data >> 8) | (*src++ << 8);
+			--cnt;
+			++cp;
+		}
+		for (; cnt == 0 && i < 2; ++i, ++cp)
+			data = (data >> 8) | (*(uchar *) cp << 8);
+
+		if ((rc = write_hword(info, wp, data)) != 0)
+			return (rc);
+		wp += 2;
+	}
+
+	/*
+	 * handle word aligned part
+	 */
+	while (cnt >= 2) {
+		data = *((vu_short *) src);
+		if ((rc = write_hword(info, wp, data)) != 0)
+			return (rc);
+		src += 2;
+		wp += 2;
+		cnt -= 2;
+	}
+
+	if (cnt == 0)
+		return ERR_OK;
+
+	/*
+	 * handle unaligned tail bytes
+	 */
+	data = 0;
+	for (i = 0, cp = wp; i < 2 && cnt > 0; ++i, ++cp) {
+		data = (data >> 8) | (*src++ << 8);
+		--cnt;
+	}
+	for (; i < 2; ++i, ++cp)
+		data = (data >> 8) | (*(uchar *) cp << 8);
+
+	return write_hword(info, wp, data);
+}
+
+#endif