Update of new NAND code
Patch by Ladislav Michl, 13 Sep 2005
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