Patch by Kurt Stremerch, 28 May 2004:
Add support for Exys XSEngine board
Some code cleanup.
diff --git a/board/xsengine/flash.c b/board/xsengine/flash.c
new file mode 100644
index 0000000..ac14bfe
--- /dev/null
+++ b/board/xsengine/flash.c
@@ -0,0 +1,565 @@
+/*
+ * (C) Copyright 2002
+ * Robert Schwebel, Pengutronix, <r.schwebel@pengutronix.de>
+ *
+ * (C) Copyright 2000-2004
+ * 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 <linux/byteorder/swab.h>
+
+#if defined CFG_JFFS_CUSTOM_PART
+#include <jffs2/jffs2.h>
+#endif
+
+#define SWAP(x) __swab32(x)
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
+
+/* Functions */
+static ulong flash_get_size (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);
+
+#if defined CFG_JFFS_CUSTOM_PART
+
+/*
+ * jffs2_part_info - get information about a JFFS2 partition
+ *
+ * @part_num: number of the partition you want to get info about
+ * @return: struct part_info* in case of success, 0 if failure
+ */
+
+static struct part_info part;
+static int current_part = -1;
+
+struct part_info* jffs2_part_info(int part_num) {
+ void *jffs2_priv_saved = part.jffs2_priv;
+
+ printf("jffs2_part_info: part_num=%i\n",part_num);
+
+ if (current_part == part_num)
+ return ∂
+
+ /* u-boot partition */
+ if(part_num==0){
+ memset(&part, 0, sizeof(part));
+
+ part.offset=(char*)0x00000000;
+ part.size=256*1024;
+
+ /* Mark the struct as ready */
+ current_part = part_num;
+
+ printf("part.offset = 0x%08x\n",(unsigned int)part.offset);
+ printf("part.size = 0x%08x\n",(unsigned int)part.size);
+ }
+
+ /* primary OS+firmware partition */
+ if(part_num==1){
+ memset(&part, 0, sizeof(part));
+
+ part.offset=(char*)0x00040000;
+ part.size=1024*1024;
+
+ /* Mark the struct as ready */
+ current_part = part_num;
+
+ printf("part.offset = 0x%08x\n",(unsigned int)part.offset);
+ printf("part.size = 0x%08x\n",(unsigned int)part.size);
+ }
+
+ /* secondary OS+firmware partition */
+ if(part_num==2){
+ memset(&part, 0, sizeof(part));
+
+ part.offset=(char*)0x00140000;
+ part.size=8*1024*1024;
+
+ /* Mark the struct as ready */
+ current_part = part_num;
+
+ printf("part.offset = 0x%08x\n",(unsigned int)part.offset);
+ printf("part.size = 0x%08x\n",(unsigned int)part.size);
+ }
+
+ if (current_part == part_num) {
+ part.usr_priv = ¤t_part;
+ part.jffs2_priv = jffs2_priv_saved;
+ return ∂
+ }
+
+ printf("jffs2_part_info: end of partition table\n");
+ return 0;
+}
+#endif
+
+
+/*-----------------------------------------------------------------------
+ */
+unsigned long flash_init (void)
+{
+ int i;
+ ulong size = 0;
+
+ for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
+ switch (i) {
+ case 0:
+ flash_get_size ((long *) PHYS_FLASH_1, &flash_info[i]);
+ flash_get_offsets (PHYS_FLASH_1, &flash_info[i]);
+ break;
+ case 1:
+ flash_get_size ((long *) PHYS_FLASH_2, &flash_info[i]);
+ flash_get_offsets (PHYS_FLASH_2, &flash_info[i]);
+ break;
+ default:
+ panic ("configured too many flash banks!\n");
+ break;
+ }
+ size += flash_info[i].size;
+ }
+
+ /* Protect monitor and environment sectors */
+ flash_protect ( FLAG_PROTECT_SET,CFG_FLASH_BASE,CFG_FLASH_BASE + monitor_flash_len - 1,&flash_info[0] );
+ flash_protect ( FLAG_PROTECT_SET,CFG_ENV_ADDR,CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0] );
+
+ return size;
+}
+
+/*-----------------------------------------------------------------------
+ */
+static void flash_get_offsets (ulong base, flash_info_t *info)
+{
+ int i;
+
+ if (info->flash_id == FLASH_UNKNOWN) return;
+
+ if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD) {
+ for (i = 0; i < info->sector_count; i++) {
+ info->start[i] = base + (i * PHYS_FLASH_SECT_SIZE);
+ info->protect[i] = 0;
+ }
+ }
+}
+
+/*-----------------------------------------------------------------------
+ */
+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;
+ default: printf ("Unknown Vendor "); break;
+ }
+
+ switch (info->flash_id & FLASH_TYPEMASK) {
+ case FLASH_AMLV128U: printf ("AM29LV128ML (128Mbit, uniform sector size)\n");
+ break;
+ case FLASH_AMLV320U: printf ("AM29LV320ML (32Mbit, uniform sector size)\n");
+ break;
+ case FLASH_AMLV640U: printf ("AM29LV640ML (64Mbit, uniform sector size)\n");
+ break;
+ case FLASH_AMLV320B: printf ("AM29LV320MB (32Mbit, bottom boot sect)\n");
+ break;
+ default: printf ("Unknown Chip Type\n");
+ break;
+ }
+
+ printf (" Size: %ld MB in %d Sectors\n",
+ info->size >> 20, 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 ulong flash_get_size (vu_long *addr, flash_info_t *info)
+{
+ short i;
+ ulong value;
+ ulong base = (ulong)addr;
+
+ /* Write auto select command: read Manufacturer ID */
+ addr[0x0555] = 0x00AA00AA;
+ addr[0x02AA] = 0x00550055;
+ addr[0x0555] = 0x00900090;
+
+ value = addr[0];
+
+ debug ("Manuf. ID @ 0x%08lx: 0x%08lx\n", (ulong)addr, value);
+
+ switch (value) {
+ case AMD_MANUFACT:
+ debug ("Manufacturer: AMD\n");
+ info->flash_id = FLASH_MAN_AMD;
+ break;
+ case FUJ_MANUFACT:
+ debug ("Manufacturer: FUJITSU\n");
+ info->flash_id = FLASH_MAN_FUJ;
+ break;
+ default:
+ debug ("Manufacturer: *** unknown ***\n");
+ info->flash_id = FLASH_UNKNOWN;
+ info->sector_count = 0;
+ info->size = 0;
+ return (0); /* no or unknown flash */
+ }
+
+ value = addr[1]; /* device ID */
+
+ debug ("Device ID @ 0x%08lx: 0x%08lx\n", (ulong)(&addr[1]), value);
+
+ switch (value) {
+
+ case AMD_ID_MIRROR:
+ debug ("Mirror Bit flash: addr[14] = %08lX addr[15] = %08lX\n",
+ addr[14], addr[15]);
+ switch(addr[14]) {
+ case AMD_ID_LV128U_2:
+ if (addr[15] != AMD_ID_LV128U_3) {
+ debug ("Chip: AMLV128U -> unknown\n");
+ info->flash_id = FLASH_UNKNOWN;
+ } else {
+ debug ("Chip: AMLV128U\n");
+ info->flash_id += FLASH_AMLV128U;
+ info->sector_count = 256;
+ info->size = 0x02000000;
+ }
+ break; /* => 32 MB */
+ case AMD_ID_LV640U_2:
+ if (addr[15] != AMD_ID_LV640U_3) {
+ debug ("Chip: AMLV640U -> unknown\n");
+ info->flash_id = FLASH_UNKNOWN;
+ } else {
+ debug ("Chip: AMLV640U\n");
+ info->flash_id += FLASH_AMLV640U;
+ info->sector_count = 128;
+ info->size = 0x01000000;
+ }
+ break; /* => 16 MB */
+ case AMD_ID_LV320B_2:
+ if (addr[15] != AMD_ID_LV320B_3) {
+ debug ("Chip: AMLV320B -> unknown\n");
+ info->flash_id = FLASH_UNKNOWN;
+ } else {
+ debug ("Chip: AMLV320B\n");
+ info->flash_id += FLASH_AMLV320B;
+ info->sector_count = 71;
+ info->size = 0x00800000;
+ }
+ break; /* => 8 MB */
+ default:
+ debug ("Chip: *** unknown ***\n");
+ info->flash_id = FLASH_UNKNOWN;
+ break;
+ }
+ break;
+
+ default:
+ info->flash_id = FLASH_UNKNOWN;
+ return (0); /* => no or unknown flash */
+ }
+
+ /* set up sector start address table */
+ switch (value) {
+ case AMD_ID_MIRROR:
+ switch (info->flash_id & FLASH_TYPEMASK) {
+ /* only known types here - no default */
+ case FLASH_AMLV128U:
+ case FLASH_AMLV640U:
+ case FLASH_AMLV320U:
+ for (i = 0; i < info->sector_count; i++) {
+ info->start[i] = base;
+ base += 0x20000;
+ }
+ break;
+ case FLASH_AMLV320B:
+ for (i = 0; i < info->sector_count; i++) {
+ info->start[i] = base;
+ /*
+ * The first 8 sectors are 8 kB,
+ * all the other ones are 64 kB
+ */
+ base += (i < 8)
+ ? 2 * ( 8 << 10)
+ : 2 * (64 << 10);
+ }
+ break;
+ }
+ break;
+
+ default:
+ return (0);
+ break;
+ }
+
+#if 0
+ /* 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 */
+ addr = (volatile unsigned long *)(info->start[i]);
+ info->protect[i] = addr[2] & 1;
+ }
+#endif
+
+ /*
+ * Prevent writes to uninitialized FLASH.
+ */
+ if (info->flash_id != FLASH_UNKNOWN) {
+ addr = (volatile unsigned long *)info->start[0];
+
+ *addr = 0x00F000F0; /* reset bank */
+ }
+
+ return (info->size);
+}
+
+
+/*-----------------------------------------------------------------------
+ */
+
+int flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+ vu_long *addr = (vu_long*)(info->start[0]);
+ int flag, prot, sect, l_sect;
+ ulong start, now, last;
+
+ debug ("flash_erase: first: %d last: %d\n", s_first, s_last);
+
+ 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_UNKNOWN) ||
+ (info->flash_id > FLASH_AMD_COMP)) {
+ printf ("Can't erase unknown flash type %08lx - aborted\n",
+ info->flash_id);
+ return 1;
+ }
+
+ 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();
+
+ addr[0x0555] = 0x00AA00AA;
+ addr[0x02AA] = 0x00550055;
+ addr[0x0555] = 0x00800080;
+ addr[0x0555] = 0x00AA00AA;
+ addr[0x02AA] = 0x00550055;
+
+ /* Start erase on unprotected sectors */
+ for (sect = s_first; sect<=s_last; sect++) {
+ if (info->protect[sect] == 0) { /* not protected */
+ addr = (vu_long*)(info->start[sect]);
+ addr[0] = 0x00300030;
+ 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 = (vu_long*)(info->start[l_sect]);
+ while ((addr[0] & 0x00800080) != 0x00800080) {
+ if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
+ printf ("Timeout\n");
+ return 1;
+ }
+ /* show that we're waiting */
+ if ((now - last) > 100000) { /* every second */
+ putc ('.');
+ last = now;
+ }
+ }
+
+DONE:
+ /* reset to read mode */
+ addr = (volatile unsigned long *)info->start[0];
+ addr[0] = 0x00F000F0; /* reset bank */
+
+ printf (" done\n");
+ return 0;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+
+int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
+{
+ ulong cp, wp, data;
+ int i, l, rc;
+
+ 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, SWAP(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, SWAP(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, SWAP(data)));
+}
+
+/*-----------------------------------------------------------------------
+ * Write a word to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_word (flash_info_t *info, ulong dest, ulong data)
+{
+ vu_long *addr = (vu_long*)(info->start[0]);
+ ulong start;
+ ulong rev;
+ int flag;
+ int i;
+
+ /* 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();
+
+ addr[0x0555] = 0x00AA00AA;
+ addr[0x02AA] = 0x00550055;
+ addr[0x0555] = 0x00A000A0;
+
+ *((vu_long *)dest) = data;
+
+ /* 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);
+}