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authorwdenk <wdenk>2002-11-02 23:17:16 +0000
committerwdenk <wdenk>2002-11-02 23:17:16 +0000
commit7ebf7443ad018a0647f549a835a55f0c08d7a15d (patch)
treeb055053545c714a70bae1cff0745f45acc3ec94e /board/evb64260/flash.c
parentcc1c8a136f9813d0a9cb9a94d2f12206873ddc4e (diff)
downloadu-boot-linaro-stable-7ebf7443ad018a0647f549a835a55f0c08d7a15d.tar.gz
Initial revision
Diffstat (limited to 'board/evb64260/flash.c')
-rw-r--r--board/evb64260/flash.c805
1 files changed, 805 insertions, 0 deletions
diff --git a/board/evb64260/flash.c b/board/evb64260/flash.c
new file mode 100644
index 000000000..2d2bf1c8e
--- /dev/null
+++ b/board/evb64260/flash.c
@@ -0,0 +1,805 @@
+/*
+ * (C) Copyright 2001
+ * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
+ *
+ * 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
+ */
+
+/*
+ * flash.c - flash support for the 512k, 8bit boot flash on the GEVB
+ * most of this file was based on the existing U-Boot
+ * flash drivers.
+ */
+
+#include <common.h>
+#include <mpc8xx.h>
+#include <galileo/gt64260R.h>
+#include <galileo/memory.h>
+#include "intel_flash.h"
+
+#define FLASH_ROM 0xFFFD /* unknown flash type */
+#define FLASH_RAM 0xFFFE /* unknown flash type */
+#define FLASH_MAN_UNKNOWN 0xFFFF0000
+
+/* #define DEBUG */
+/* #define FLASH_ID_OVERRIDE */ /* Hack to set type to 040B if ROM emulator is installed.
+ * Can be used to program a ROM in circuit if a programmer
+ * is not available by swapping the rom out. */
+
+/* Intel flash commands */
+int flash_erase_intel(flash_info_t *info, int s_first, int s_last);
+int write_word_intel(bank_addr_t addr, bank_word_t value);
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+static ulong flash_get_size (int portwidth, vu_long *addr, flash_info_t *info);
+static int write_word (flash_info_t *info, ulong dest, ulong data);
+static void flash_get_offsets (ulong base, flash_info_t *info);
+
+/*-----------------------------------------------------------------------
+ */
+
+unsigned long
+flash_init (void)
+{
+ unsigned int i;
+ unsigned long size_b0 = 0, size_b1 = 0;
+ unsigned long base, flash_size;
+
+ /* Init: no FLASHes known */
+ for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
+ flash_info[i].flash_id = FLASH_UNKNOWN;
+ }
+
+ /* the boot flash */
+ base = CFG_FLASH_BASE;
+ size_b0 = flash_get_size(1, (vu_long *)base, &flash_info[0]);
+
+ printf("[%ldkB@%lx] ", size_b0/1024, base);
+
+ if (flash_info[0].flash_id == FLASH_UNKNOWN) {
+ printf ("## Unknown FLASH at %08lx: Size = 0x%08lx = %ld MB\n",
+ base, size_b0, size_b0<<20);
+ }
+
+ base = memoryGetDeviceBaseAddress(CFG_EXTRA_FLASH_DEVICE);
+ for(i=1;i<CFG_MAX_FLASH_BANKS;i++) {
+ unsigned long size = flash_get_size(CFG_EXTRA_FLASH_WIDTH, (vu_long *)base, &flash_info[i]);
+
+ printf("[%ldMB@%lx] ", size>>20, base);
+
+ if (flash_info[i].flash_id == FLASH_UNKNOWN) {
+ if(i==1) {
+ printf ("## Unknown FLASH at %08lx: Size = 0x%08lx = %ld MB\n",
+ base, size_b1, size_b1<<20);
+ }
+ break;
+ }
+ size_b1+=size;
+ base+=size;
+ }
+
+ flash_size = size_b0 + size_b1;
+ return flash_size;
+}
+
+/*-----------------------------------------------------------------------
+ */
+static void
+flash_get_offsets (ulong base, flash_info_t *info)
+{
+ int i;
+ int sector_size;
+
+ if(!info->sector_count) return;
+
+ /* set up sector start address table */
+ switch(info->flash_id & FLASH_TYPEMASK) {
+ case FLASH_AM040:
+ case FLASH_28F128J3A:
+ case FLASH_28F640J3A:
+ case FLASH_RAM:
+ /* this chip has uniformly spaced sectors */
+ sector_size=info->size/info->sector_count;
+ for (i = 0; i < info->sector_count; i++)
+ info->start[i] = base + (i * sector_size);
+ break;
+ default:
+ if (info->flash_id & FLASH_BTYPE) {
+ /* set sector offsets for bottom boot block type */
+ info->start[0] = base + 0x00000000;
+ info->start[1] = base + 0x00008000;
+ info->start[2] = base + 0x0000C000;
+ info->start[3] = base + 0x00010000;
+ for (i = 4; i < info->sector_count; i++) {
+ info->start[i] = base + (i * 0x00020000) - 0x00060000;
+ }
+ } else {
+ /* set sector offsets for top boot block type */
+ i = info->sector_count - 1;
+ info->start[i--] = base + info->size - 0x00008000;
+ info->start[i--] = base + info->size - 0x0000C000;
+ info->start[i--] = base + info->size - 0x00010000;
+ for (; i >= 0; i--) {
+ info->start[i] = base + i * 0x00020000;
+ }
+ }
+ }
+}
+
+/*-----------------------------------------------------------------------
+ */
+void
+flash_print_info (flash_info_t *info)
+{
+ int i;
+
+ if (info->flash_id == FLASH_UNKNOWN) {
+ printf ("missing or unknown FLASH type\n");
+ return;
+ }
+
+ switch (info->flash_id & FLASH_VENDMASK) {
+ case FLASH_MAN_AMD: printf ("AMD "); break;
+ case FLASH_MAN_FUJ: printf ("FUJITSU "); break;
+ case FLASH_MAN_INTEL: printf ("INTEL "); break;
+ default: printf ("Unknown Vendor "); break;
+ }
+
+ switch (info->flash_id & FLASH_TYPEMASK) {
+ case FLASH_AM040:
+ printf ("AM29LV040B (4 Mbit, bottom boot sect)\n");
+ break;
+ case FLASH_AM400B:
+ printf ("AM29LV400B (4 Mbit, bottom boot sect)\n");
+ break;
+ case FLASH_AM400T:
+ printf ("AM29LV400T (4 Mbit, top boot sector)\n");
+ break;
+ case FLASH_AM800B:
+ printf ("AM29LV800B (8 Mbit, bottom boot sect)\n");
+ break;
+ case FLASH_AM800T:
+ printf ("AM29LV800T (8 Mbit, top boot sector)\n");
+ break;
+ case FLASH_AM160B:
+ printf ("AM29LV160B (16 Mbit, bottom boot sect)\n");
+ break;
+ case FLASH_AM160T:
+ printf ("AM29LV160T (16 Mbit, top boot sector)\n");
+ break;
+ case FLASH_AM320B:
+ printf ("AM29LV320B (32 Mbit, bottom boot sect)\n");
+ break;
+ case FLASH_AM320T:
+ printf ("AM29LV320T (32 Mbit, top boot sector)\n");
+ break;
+ case FLASH_28F640J3A:
+ printf ("28F640J3A (64 Mbit)\n");
+ break;
+ case FLASH_28F128J3A:
+ printf ("28F128J3A (128 Mbit)\n");
+ break;
+ case FLASH_ROM:
+ printf ("ROM\n");
+ break;
+ case FLASH_RAM:
+ printf ("RAM\n");
+ break;
+ default:
+ printf ("Unknown Chip Type\n");
+ break;
+ }
+
+ puts (" Size: ");
+ print_size (info->size, "");
+ printf (" in %d Sectors\n", info->sector_count);
+
+ printf (" Sector Start Addresses:");
+ for (i=0; i<info->sector_count; ++i) {
+ if ((i % 5) == 0)
+ printf ("\n ");
+ printf (" %08lX%s",
+ info->start[i],
+ info->protect[i] ? " (RO)" : " "
+ );
+ }
+ printf ("\n");
+ return;
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+
+/*-----------------------------------------------------------------------
+ */
+
+/*
+ * The following code cannot be run from FLASH!
+ */
+
+static inline void flash_cmd(int width, volatile unsigned char *addr, int offset, unsigned char cmd)
+{
+ /* supports 1x8, 1x16, and 2x16 */
+ /* 2x8 and 4x8 are not supported */
+ if(width==4) {
+ /* assuming chips are in 16 bit mode */
+ /* 2x16 */
+ unsigned long cmd32=(cmd<<16)|cmd;
+ *(volatile unsigned long *)(addr+offset*2)=cmd32;
+ } else {
+ /* 1x16 or 1x8 */
+ *(volatile unsigned char *)(addr+offset)=cmd;
+ }
+}
+
+static ulong
+flash_get_size (int portwidth, vu_long *addr, flash_info_t *info)
+{
+ short i;
+ volatile unsigned char *caddr = (unsigned char *)addr;
+ volatile unsigned short *saddr = (unsigned short *)addr;
+ volatile unsigned long *laddr = (unsigned long *)addr;
+ char old[2], save;
+ ulong id, manu, base = (ulong)addr;
+
+ info->portwidth=portwidth;
+
+ save = *caddr;
+
+ flash_cmd(portwidth,caddr,0,0xf0);
+ flash_cmd(portwidth,caddr,0,0xf0);
+
+ udelay(10);
+
+ old[0] = caddr[0];
+ old[1] = caddr[1];
+
+
+ if(old[0]!=0xf0) {
+ flash_cmd(portwidth,caddr,0,0xf0);
+ flash_cmd(portwidth,caddr,0,0xf0);
+
+ udelay(10);
+
+ if(*caddr==0xf0) {
+ /* this area is ROM */
+ *caddr=save;
+#ifndef FLASH_ID_OVERRIDE
+ info->flash_id = FLASH_ROM + FLASH_MAN_UNKNOWN;
+ info->sector_count = 8;
+ info->size = 0x80000;
+#else
+ info->flash_id = FLASH_MAN_AMD + FLASH_AM040;
+ info->sector_count = 8;
+ info->size = 0x80000;
+ info->chipwidth=1;
+#endif
+ flash_get_offsets(base, info);
+ return info->size;
+ }
+ } else {
+ *caddr=0;
+
+ udelay(10);
+
+ if(*caddr==0) {
+ /* this area is RAM */
+ *caddr=save;
+ info->flash_id = FLASH_RAM + FLASH_MAN_UNKNOWN;
+ info->sector_count = 8;
+ info->size = 0x80000;
+ flash_get_offsets(base, info);
+ return info->size;
+ }
+ flash_cmd(portwidth,caddr,0,0xf0);
+
+ udelay(10);
+ }
+
+ /* Write auto select command: read Manufacturer ID */
+ flash_cmd(portwidth,caddr,0x555,0xAA);
+ flash_cmd(portwidth,caddr,0x2AA,0x55);
+ flash_cmd(portwidth,caddr,0x555,0x90);
+
+ udelay(10);
+
+ if ((caddr[0] == old[0]) &&
+ (caddr[1] == old[1])) {
+
+ /* this area is ROM */
+#ifndef FLASH_ID_OVERRIDE
+ info->flash_id = FLASH_ROM + FLASH_MAN_UNKNOWN;
+ info->sector_count = 8;
+ info->size = 0x80000;
+#else
+ info->flash_id = FLASH_MAN_AMD + FLASH_AM040;
+ info->sector_count = 8;
+ info->size = 0x80000;
+ info->chipwidth=1;
+#endif
+ flash_get_offsets(base, info);
+ return info->size;
+#ifdef DEBUG
+ } else {
+ printf("%px%d: %02x:%02x -> %02x:%02x\n",
+ caddr, portwidth, old[0], old[1],
+ caddr[0], caddr[1]);
+#endif
+ }
+
+ switch(portwidth) {
+ case 1:
+ manu = caddr[0];
+ manu |= manu<<16;
+ id = caddr[1];
+ break;
+ case 2:
+ manu = saddr[0];
+ manu |= manu<<16;
+ id = saddr[1];
+ id |= id<<16;
+ break;
+ case 4:
+ manu = laddr[0];
+ id = laddr[1];
+ break;
+ default:
+ id = manu = -1;
+ break;
+ }
+
+#ifdef DEBUG
+ printf("\n%08lx:%08lx:%08lx\n", base, manu, id);
+ printf("%08lx %08lx %08lx %08lx\n",
+ laddr[0],laddr[1],laddr[2],laddr[3]);
+#endif
+
+ switch (manu) {
+ case AMD_MANUFACT:
+ info->flash_id = FLASH_MAN_AMD;
+ break;
+ case FUJ_MANUFACT:
+ info->flash_id = FLASH_MAN_FUJ;
+ break;
+ case INTEL_MANUFACT:
+ info->flash_id = FLASH_MAN_INTEL;
+ break;
+ default:
+ printf("Unknown Mfr [%08lx]:%08lx\n", manu, id);
+ info->flash_id = FLASH_UNKNOWN;
+ info->sector_count = 0;
+ info->size = 0;
+ return (0); /* no or unknown flash */
+ }
+
+ switch (id) {
+ case AMD_ID_LV400T:
+ info->flash_id += FLASH_AM400T;
+ info->sector_count = 11;
+ info->size = 0x00100000;
+ info->chipwidth=1;
+ break; /* => 1 MB */
+
+ case AMD_ID_LV400B:
+ info->flash_id += FLASH_AM400B;
+ info->sector_count = 11;
+ info->size = 0x00100000;
+ info->chipwidth=1;
+ break; /* => 1 MB */
+
+ case AMD_ID_LV800T:
+ info->flash_id += FLASH_AM800T;
+ info->sector_count = 19;
+ info->size = 0x00200000;
+ info->chipwidth=1;
+ break; /* => 2 MB */
+
+ case AMD_ID_LV800B:
+ info->flash_id += FLASH_AM800B;
+ info->sector_count = 19;
+ info->size = 0x00200000;
+ info->chipwidth=1;
+ break; /* => 2 MB */
+
+ case AMD_ID_LV160T:
+ info->flash_id += FLASH_AM160T;
+ info->sector_count = 35;
+ info->size = 0x00400000;
+ info->chipwidth=1;
+ break; /* => 4 MB */
+
+ case AMD_ID_LV160B:
+ info->flash_id += FLASH_AM160B;
+ info->sector_count = 35;
+ info->size = 0x00400000;
+ info->chipwidth=1;
+ break; /* => 4 MB */
+#if 0 /* enable when device IDs are available */
+ case AMD_ID_LV320T:
+ info->flash_id += FLASH_AM320T;
+ info->sector_count = 67;
+ info->size = 0x00800000;
+ break; /* => 8 MB */
+
+ case AMD_ID_LV320B:
+ info->flash_id += FLASH_AM320B;
+ info->sector_count = 67;
+ info->size = 0x00800000;
+ break; /* => 8 MB */
+#endif
+ case AMD_ID_LV040B:
+ info->flash_id += FLASH_AM040;
+ info->sector_count = 8;
+ info->size = 0x80000;
+ info->chipwidth=1;
+ break;
+
+ case INTEL_ID_28F640J3A:
+ info->flash_id += FLASH_28F640J3A;
+ info->sector_count = 64;
+ info->size = 128*1024 * 64; /* 128kbytes x 64 blocks */
+ info->chipwidth=2;
+ if(portwidth==4) info->size*=2; /* 2x16 */
+ break;
+
+ case INTEL_ID_28F128J3A:
+ info->flash_id += FLASH_28F128J3A;
+ info->sector_count = 128;
+ info->size = 128*1024 * 128; /* 128kbytes x 128 blocks */
+ info->chipwidth=2;
+ if(portwidth==4) info->size*=2; /* 2x16 */
+ break;
+
+ default:
+ printf("Unknown id %lx:[%lx]\n", manu, id);
+ info->flash_id = FLASH_UNKNOWN;
+ info->chipwidth=1;
+ return (0); /* => no or unknown flash */
+
+ }
+
+ flash_get_offsets(base, info);
+
+#if 0
+ /* set up sector start address table */
+ if (info->flash_id & FLASH_AM040) {
+ /* this chip has uniformly spaced sectors */
+ for (i = 0; i < info->sector_count; i++)
+ info->start[i] = base + (i * 0x00010000);
+
+ } else if (info->flash_id & FLASH_BTYPE) {
+ /* set sector offsets for bottom boot block type */
+ info->start[0] = base + 0x00000000;
+ info->start[1] = base + 0x00008000;
+ info->start[2] = base + 0x0000C000;
+ info->start[3] = base + 0x00010000;
+ for (i = 4; i < info->sector_count; i++) {
+ info->start[i] = base + (i * 0x00020000) - 0x00060000;
+ }
+ } else {
+ /* set sector offsets for top boot block type */
+ i = info->sector_count - 1;
+ info->start[i--] = base + info->size - 0x00008000;
+ info->start[i--] = base + info->size - 0x0000C000;
+ info->start[i--] = base + info->size - 0x00010000;
+ for (; i >= 0; i--) {
+ info->start[i] = base + i * 0x00020000;
+ }
+ }
+#endif
+
+ /* check for protected sectors */
+ for (i = 0; i < info->sector_count; i++) {
+ /* read sector protection at sector address, (A7 .. A0)=0x02 */
+ /* D0 = 1 if protected */
+ caddr = (volatile unsigned char *)(info->start[i]);
+ saddr = (volatile unsigned short *)(info->start[i]);
+ laddr = (volatile unsigned long *)(info->start[i]);
+ if(portwidth==1)
+ info->protect[i] = caddr[2] & 1;
+ else if(portwidth==2)
+ info->protect[i] = saddr[2] & 1;
+ else
+ info->protect[i] = laddr[2] & 1;
+ }
+
+ /*
+ * Prevent writes to uninitialized FLASH.
+ */
+ if (info->flash_id != FLASH_UNKNOWN) {
+ caddr = (volatile unsigned char *)info->start[0];
+
+ flash_cmd(portwidth,caddr,0,0xF0); /* reset bank */
+ }
+
+ return (info->size);
+}
+
+/* TODO: 2x16 unsupported */
+int
+flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+ volatile unsigned char *addr = (char *)(info->start[0]);
+ int flag, prot, sect, l_sect;
+ ulong start, now, last;
+
+ /* TODO: 2x16 unsupported */
+ if(info->portwidth==4) return 1;
+
+ if((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM) return 1;
+ if((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
+ for (sect = s_first; sect<=s_last; sect++) {
+ int sector_size=info->size/info->sector_count;
+ addr = (char *)(info->start[sect]);
+ memset((void *)addr, 0, sector_size);
+ }
+ return 0;
+ }
+
+ if ((s_first < 0) || (s_first > s_last)) {
+ if (info->flash_id == FLASH_UNKNOWN) {
+ printf ("- missing\n");
+ } else {
+ printf ("- no sectors to erase\n");
+ }
+ return 1;
+ }
+
+ if ((info->flash_id&FLASH_VENDMASK) == FLASH_MAN_INTEL) {
+ return flash_erase_intel(info,
+ (unsigned short)s_first,
+ (unsigned short)s_last);
+ }
+
+#if 0
+ if ((info->flash_id == FLASH_UNKNOWN) ||
+ (info->flash_id > FLASH_AMD_COMP)) {
+ printf ("Can't erase unknown flash type %08lx - aborted\n",
+ info->flash_id);
+ return 1;
+ }
+#endif
+
+ 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 {
+ printf ("\n");
+ }
+
+ l_sect = -1;
+
+ /* Disable interrupts which might cause a timeout here */
+ flag = disable_interrupts();
+
+ flash_cmd(info->portwidth,addr,0x555,0xAA);
+ flash_cmd(info->portwidth,addr,0x2AA,0x55);
+ flash_cmd(info->portwidth,addr,0x555,0x80);
+ flash_cmd(info->portwidth,addr,0x555,0xAA);
+ flash_cmd(info->portwidth,addr,0x2AA,0x55);
+
+ /* Start erase on unprotected sectors */
+ for (sect = s_first; sect<=s_last; sect++) {
+ if (info->protect[sect] == 0) { /* not protected */
+ addr = (char *)(info->start[sect]);
+ flash_cmd(info->portwidth,addr,0,0x30);
+ l_sect = sect;
+ }
+ }
+
+ /* re-enable interrupts if necessary */
+ if (flag)
+ enable_interrupts();
+
+ /* wait at least 80us - let's wait 1 ms */
+ udelay (1000);
+
+ /*
+ * We wait for the last triggered sector
+ */
+ if (l_sect < 0)
+ goto DONE;
+
+ start = get_timer (0);
+ last = start;
+ addr = (volatile unsigned char *)(info->start[l_sect]);
+ /* broken for 2x16: TODO */
+ while ((addr[0] & 0x80) != 0x80) {
+ if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
+ printf ("Timeout\n");
+ return 1;
+ }
+ /* show that we're waiting */
+ if ((now - last) > 1000) { /* every second */
+ putc ('.');
+ last = now;
+ }
+ }
+
+DONE:
+ /* reset to read mode */
+ addr = (volatile unsigned char *)info->start[0];
+ flash_cmd(info->portwidth,addr,0,0xf0);
+ flash_cmd(info->portwidth,addr,0,0xf0);
+
+ printf (" done\n");
+ return 0;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+
+/* broken for 2x16: TODO */
+int
+write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+ ulong cp, wp, data;
+ int i, l, rc;
+
+ if(info->portwidth==4) return 1;
+
+ if((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM) return 0;
+ if((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
+ memcpy((void *)addr, src, cnt);
+ return 0;
+ }
+
+ wp = (addr & ~3); /* 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);
+ }
+ for (; i<4 && cnt>0; ++i) {
+ data = (data << 8) | *src++;
+ --cnt;
+ ++cp;
+ }
+ for (; cnt==0 && i<4; ++i, ++cp) {
+ data = (data << 8) | (*(uchar *)cp);
+ }
+
+ if ((rc = write_word(info, wp, data)) != 0) {
+ return (rc);
+ }
+ wp += 4;
+ }
+
+ /*
+ * handle word aligned part
+ */
+ while (cnt >= 4) {
+ data = 0;
+ for (i=0; i<4; ++i) {
+ data = (data << 8) | *src++;
+ }
+ if ((rc = write_word(info, wp, data)) != 0) {
+ return (rc);
+ }
+ wp += 4;
+ cnt -= 4;
+ }
+
+ if (cnt == 0) {
+ return (0);
+ }
+
+ /*
+ * handle unaligned tail bytes
+ */
+ data = 0;
+ for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
+ data = (data << 8) | *src++;
+ --cnt;
+ }
+ for (; i<4; ++i, ++cp) {
+ data = (data << 8) | (*(uchar *)cp);
+ }
+
+ return (write_word(info, wp, data));
+}
+
+/*-----------------------------------------------------------------------
+ * Write a word to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+/* broken for 2x16: TODO */
+static int
+write_word (flash_info_t *info, ulong dest, ulong data)
+{
+ volatile unsigned char *addr = (char *)(info->start[0]);
+ ulong start;
+ int flag, i;
+
+ if(info->portwidth==4) return 1;
+
+ if((info->flash_id & FLASH_TYPEMASK) == FLASH_ROM) return 1;
+ if((info->flash_id & FLASH_TYPEMASK) == FLASH_RAM) {
+ *(unsigned long *)dest=data;
+ return 0;
+ }
+ if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
+ unsigned short low = data & 0xffff;
+ unsigned short hi = (data >> 16) & 0xffff;
+ int ret = write_word_intel((bank_addr_t)dest, hi);
+
+ if (!ret) ret = write_word_intel((bank_addr_t)(dest+2), low);
+
+ return ret;
+ }
+
+ /* Check if Flash is (sufficiently) erased */
+ if ((*((vu_long *)dest) & data) != data) {
+ return (2);
+ }
+ /* Disable interrupts which might cause a timeout here */
+ flag = disable_interrupts();
+
+ /* first, perform an unlock bypass command to speed up flash writes */
+ addr[0x555] = 0xAA;
+ addr[0x2AA] = 0x55;
+ addr[0x555] = 0x20;
+
+ /* write each byte out */
+ for (i = 0; i < 4; i++) {
+ char *data_ch = (char *)&data;
+ addr[0] = 0xA0;
+ *(((char *)dest)+i) = data_ch[i];
+ udelay(10); /* XXX */
+ }
+
+ /* we're done, now do an unlock bypass reset */
+ addr[0] = 0x90;
+ addr[0] = 0x00;
+
+ /* re-enable interrupts if necessary */
+ if (flag)
+ enable_interrupts();
+
+ /* data polling for D7 */
+ start = get_timer (0);
+ while ((*((vu_long *)dest) & 0x00800080) != (data & 0x00800080)) {
+ if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+ return (1);
+ }
+ }
+ return (0);
+}