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-rw-r--r--board/bmw/flash.c757
1 files changed, 757 insertions, 0 deletions
diff --git a/board/bmw/flash.c b/board/bmw/flash.c
new file mode 100644
index 0000000..6a7649f
--- /dev/null
+++ b/board/bmw/flash.c
@@ -0,0 +1,757 @@
+/*
+ * (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 <mpc824x.h>
+#include <asm/processor.h>
+#include <asm/pci_io.h>
+
+#define ROM_CS0_START 0xFF800000
+#define ROM_CS1_START 0xFF000000
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
+
+#if defined(CFG_ENV_IS_IN_FLASH)
+# ifndef CFG_ENV_ADDR
+# define CFG_ENV_ADDR (CFG_FLASH_BASE + CFG_ENV_OFFSET)
+# endif
+# ifndef CFG_ENV_SIZE
+# define CFG_ENV_SIZE CFG_ENV_SECT_SIZE
+# endif
+# ifndef CFG_ENV_SECT_SIZE
+# define CFG_ENV_SECT_SIZE CFG_ENV_SIZE
+# endif
+#endif
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+static int write_word (flash_info_t *info, ulong dest, ulong data);
+#if 0
+static void flash_get_offsets (ulong base, flash_info_t *info);
+#endif /* 0 */
+
+/*flash command address offsets*/
+
+#if 0
+#define ADDR0 (0x555)
+#define ADDR1 (0x2AA)
+#define ADDR3 (0x001)
+#else
+#define ADDR0 (0xAAA)
+#define ADDR1 (0x555)
+#define ADDR3 (0x001)
+#endif
+
+#define FLASH_WORD_SIZE unsigned char
+
+/*-----------------------------------------------------------------------
+ */
+
+#if 0
+static int byte_parity_odd(unsigned char x) __attribute__ ((const));
+#endif /* 0 */
+static unsigned long flash_id(unsigned char mfct, unsigned char chip) __attribute__ ((const));
+
+typedef struct
+{
+ FLASH_WORD_SIZE extval;
+ unsigned short intval;
+} map_entry;
+
+#if 0
+static int
+byte_parity_odd(unsigned char x)
+{
+ x ^= x >> 4;
+ x ^= x >> 2;
+ x ^= x >> 1;
+ return (x & 0x1) != 0;
+}
+#endif /* 0 */
+
+
+
+static unsigned long
+flash_id(unsigned char mfct, unsigned char chip)
+{
+ static const map_entry mfct_map[] =
+ {
+ {(FLASH_WORD_SIZE) AMD_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_AMD >> 16)},
+ {(FLASH_WORD_SIZE) FUJ_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_FUJ >> 16)},
+ {(FLASH_WORD_SIZE) STM_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_STM >> 16)},
+ {(FLASH_WORD_SIZE) MT_MANUFACT, (unsigned short) ((unsigned long) FLASH_MAN_MT >> 16)},
+ {(FLASH_WORD_SIZE) INTEL_MANUFACT,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)},
+ {(FLASH_WORD_SIZE) INTEL_ALT_MANU,(unsigned short) ((unsigned long) FLASH_MAN_INTEL >> 16)}
+ };
+
+ static const map_entry chip_map[] =
+ {
+ {AMD_ID_F040B, FLASH_AM040},
+ {(FLASH_WORD_SIZE) STM_ID_x800AB, FLASH_STM800AB}
+ };
+
+ const map_entry *p;
+ unsigned long result = FLASH_UNKNOWN;
+
+ /* find chip id */
+ for(p = &chip_map[0]; p < &chip_map[sizeof chip_map / sizeof chip_map[0]]; p++)
+ if(p->extval == chip)
+ {
+ result = FLASH_VENDMASK | p->intval;
+ break;
+ }
+
+ /* find vendor id */
+ for(p = &mfct_map[0]; p < &mfct_map[sizeof mfct_map / sizeof mfct_map[0]]; p++)
+ if(p->extval == mfct)
+ {
+ result &= ~FLASH_VENDMASK;
+ result |= (unsigned long) p->intval << 16;
+ break;
+ }
+
+ return result;
+}
+
+
+
+unsigned long
+flash_init(void)
+{
+ unsigned long i;
+ unsigned char j;
+ static const ulong flash_banks[] = CFG_FLASH_BANKS;
+
+ /* Init: no FLASHes known */
+ for (i = 0; i < CFG_MAX_FLASH_BANKS; i++)
+ {
+ flash_info_t * const pflinfo = &flash_info[i];
+ pflinfo->flash_id = FLASH_UNKNOWN;
+ pflinfo->size = 0;
+ pflinfo->sector_count = 0;
+ }
+
+ for(i = 0; i < sizeof flash_banks / sizeof flash_banks[0]; i++)
+ {
+ flash_info_t * const pflinfo = &flash_info[i];
+ const unsigned long base_address = flash_banks[i];
+ volatile FLASH_WORD_SIZE * const flash = (FLASH_WORD_SIZE *) base_address;
+#if 0
+ volatile FLASH_WORD_SIZE * addr2;
+#endif
+#if 0
+ /* write autoselect sequence */
+ flash[0x5555] = 0xaa;
+ flash[0x2aaa] = 0x55;
+ flash[0x5555] = 0x90;
+#else
+ flash[0xAAA << (3 * i)] = 0xaa;
+ flash[0x555 << (3 * i)] = 0x55;
+ flash[0xAAA << (3 * i)] = 0x90;
+#endif
+ __asm__ __volatile__("sync");
+
+#if 0
+ pflinfo->flash_id = flash_id(flash[0x0], flash[0x1]);
+#else
+ pflinfo->flash_id = flash_id(flash[0x0], flash[0x2 + 14 * i]);
+#endif
+
+ switch(pflinfo->flash_id & FLASH_TYPEMASK)
+ {
+ case FLASH_AM040:
+ pflinfo->size = 0x00080000;
+ pflinfo->sector_count = 8;
+ for(j = 0; j < 8; j++)
+ {
+ pflinfo->start[j] = base_address + 0x00010000 * j;
+ pflinfo->protect[j] = flash[(j << 16) | 0x2];
+ }
+ break;
+ case FLASH_STM800AB:
+ pflinfo->size = 0x00100000;
+ pflinfo->sector_count = 19;
+ pflinfo->start[0] = base_address;
+ pflinfo->start[1] = base_address + 0x4000;
+ pflinfo->start[2] = base_address + 0x6000;
+ pflinfo->start[3] = base_address + 0x8000;
+ for(j = 1; j < 16; j++)
+ {
+ pflinfo->start[j+3] = base_address + 0x00010000 * j;
+ }
+#if 0
+ /* check for protected sectors */
+ for (j = 0; j < pflinfo->sector_count; j++) {
+ /* read sector protection at sector address, (A7 .. A0) = 0x02 */
+ /* D0 = 1 if protected */
+ addr2 = (volatile FLASH_WORD_SIZE *)(pflinfo->start[j]);
+ if (pflinfo->flash_id & FLASH_MAN_SST)
+ pflinfo->protect[j] = 0;
+ else
+ pflinfo->protect[j] = addr2[2] & 1;
+ }
+#endif
+ break;
+ }
+ /* Protect monitor and environment sectors
+ */
+#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
+ flash_protect(FLAG_PROTECT_SET,
+ CFG_MONITOR_BASE,
+ CFG_MONITOR_BASE + CFG_MONITOR_LEN - 1,
+ &flash_info[0]);
+#endif
+
+#if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
+ flash_protect(FLAG_PROTECT_SET,
+ CFG_ENV_ADDR,
+ CFG_ENV_ADDR + CFG_ENV_SIZE - 1,
+ &flash_info[0]);
+#endif
+
+ /* reset device to read mode */
+ flash[0x0000] = 0xf0;
+ __asm__ __volatile__("sync");
+ }
+
+ return flash_info[0].size + flash_info[1].size;
+}
+
+#if 0
+static void
+flash_get_offsets (ulong base, flash_info_t *info)
+{
+ int i;
+
+ /* set up sector start address table */
+ if (info->flash_id & FLASH_MAN_SST)
+ {
+ 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 + 0x00004000;
+ info->start[2] = base + 0x00006000;
+ info->start[3] = base + 0x00008000;
+ for (i = 4; i < info->sector_count; i++) {
+ info->start[i] = base + (i * 0x00010000) - 0x00030000;
+ }
+ } else {
+ /* set sector offsets for top boot block type */
+ i = info->sector_count - 1;
+ info->start[i--] = base + info->size - 0x00004000;
+ info->start[i--] = base + info->size - 0x00006000;
+ info->start[i--] = base + info->size - 0x00008000;
+ for (; i >= 0; i--) {
+ info->start[i] = base + i * 0x00010000;
+ }
+ }
+
+}
+#endif /* 0 */
+
+/*-----------------------------------------------------------------------
+ */
+void
+flash_print_info(flash_info_t *info)
+{
+ static const char unk[] = "Unknown";
+ const char *mfct = unk, *type = unk;
+ unsigned int i;
+
+ if(info->flash_id != FLASH_UNKNOWN)
+ {
+ switch(info->flash_id & FLASH_VENDMASK)
+ {
+ case FLASH_MAN_AMD: mfct = "AMD"; break;
+ case FLASH_MAN_FUJ: mfct = "FUJITSU"; break;
+ case FLASH_MAN_STM: mfct = "STM"; break;
+ case FLASH_MAN_SST: mfct = "SST"; break;
+ case FLASH_MAN_BM: mfct = "Bright Microelectonics"; break;
+ case FLASH_MAN_INTEL: mfct = "Intel"; break;
+ }
+
+ switch(info->flash_id & FLASH_TYPEMASK)
+ {
+ case FLASH_AM040: type = "AM29F040B (512K * 8, uniform sector size)"; break;
+ case FLASH_AM400B: type = "AM29LV400B (4 Mbit, bottom boot sect)"; break;
+ case FLASH_AM400T: type = "AM29LV400T (4 Mbit, top boot sector)"; break;
+ case FLASH_AM800B: type = "AM29LV800B (8 Mbit, bottom boot sect)"; break;
+ case FLASH_AM800T: type = "AM29LV800T (8 Mbit, top boot sector)"; break;
+ case FLASH_AM160T: type = "AM29LV160T (16 Mbit, top boot sector)"; break;
+ case FLASH_AM320B: type = "AM29LV320B (32 Mbit, bottom boot sect)"; break;
+ case FLASH_AM320T: type = "AM29LV320T (32 Mbit, top boot sector)"; break;
+ case FLASH_STM800AB: type = "M29W800AB (8 Mbit, bottom boot sect)"; break;
+ case FLASH_SST800A: type = "SST39LF/VF800 (8 Mbit, uniform sector size)"; break;
+ case FLASH_SST160A: type = "SST39LF/VF160 (16 Mbit, uniform sector size)"; break;
+ }
+ }
+
+ printf(
+ "\n Brand: %s Type: %s\n"
+ " Size: %lu KB in %d Sectors\n",
+ mfct,
+ type,
+ info->size >> 10,
+ info->sector_count
+ );
+
+ printf (" Sector Start Addresses:");
+
+ for (i = 0; i < info->sector_count; i++)
+ {
+ unsigned long size;
+ unsigned int erased;
+ unsigned long * flash = (unsigned long *) info->start[i];
+
+ /*
+ * Check if whole sector is erased
+ */
+ size =
+ (i != (info->sector_count - 1)) ?
+ (info->start[i + 1] - info->start[i]) >> 2 :
+ (info->start[0] + info->size - info->start[i]) >> 2;
+
+ for(
+ flash = (unsigned long *) info->start[i], erased = 1;
+ (flash != (unsigned long *) info->start[i] + size) && erased;
+ flash++
+ )
+ erased = *flash == ~0x0UL;
+
+ printf(
+ "%s %08lX %s %s",
+ (i % 5) ? "" : "\n ",
+ info->start[i],
+ erased ? "E" : " ",
+ info->protect[i] ? "RO" : " "
+ );
+ }
+
+ puts("\n");
+ return;
+}
+
+#if 0
+
+/*
+ * The following code cannot be run from FLASH!
+ */
+ulong
+flash_get_size (vu_long *addr, flash_info_t *info)
+{
+ short i;
+ FLASH_WORD_SIZE value;
+ ulong base = (ulong)addr;
+ volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)addr;
+
+ printf("flash_get_size: \n");
+ /* Write auto select command: read Manufacturer ID */
+ eieio();
+ addr2[ADDR0] = (FLASH_WORD_SIZE)0xAA;
+ addr2[ADDR1] = (FLASH_WORD_SIZE)0x55;
+ addr2[ADDR0] = (FLASH_WORD_SIZE)0x90;
+ value = addr2[0];
+
+ switch (value) {
+ case (FLASH_WORD_SIZE)AMD_MANUFACT:
+ info->flash_id = FLASH_MAN_AMD;
+ break;
+ case (FLASH_WORD_SIZE)FUJ_MANUFACT:
+ info->flash_id = FLASH_MAN_FUJ;
+ break;
+ case (FLASH_WORD_SIZE)SST_MANUFACT:
+ info->flash_id = FLASH_MAN_SST;
+ break;
+ default:
+ info->flash_id = FLASH_UNKNOWN;
+ info->sector_count = 0;
+ info->size = 0;
+ return (0); /* no or unknown flash */
+ }
+ printf("recognised manufacturer");
+
+ value = addr2[ADDR3]; /* device ID */
+ debug ("\ndev_code=%x\n", value);
+
+ switch (value) {
+ case (FLASH_WORD_SIZE)AMD_ID_LV400T:
+ info->flash_id += FLASH_AM400T;
+ info->sector_count = 11;
+ info->size = 0x00080000;
+ break; /* => 0.5 MB */
+
+ case (FLASH_WORD_SIZE)AMD_ID_LV400B:
+ info->flash_id += FLASH_AM400B;
+ info->sector_count = 11;
+ info->size = 0x00080000;
+ break; /* => 0.5 MB */
+
+ case (FLASH_WORD_SIZE)AMD_ID_LV800T:
+ info->flash_id += FLASH_AM800T;
+ info->sector_count = 19;
+ info->size = 0x00100000;
+ break; /* => 1 MB */
+
+ case (FLASH_WORD_SIZE)AMD_ID_LV800B:
+ info->flash_id += FLASH_AM800B;
+ info->sector_count = 19;
+ info->size = 0x00100000;
+ break; /* => 1 MB */
+
+ case (FLASH_WORD_SIZE)AMD_ID_LV160T:
+ info->flash_id += FLASH_AM160T;
+ info->sector_count = 35;
+ info->size = 0x00200000;
+ break; /* => 2 MB */
+
+ case (FLASH_WORD_SIZE)AMD_ID_LV160B:
+ info->flash_id += FLASH_AM160B;
+ info->sector_count = 35;
+ info->size = 0x00200000;
+ break; /* => 2 MB */
+
+ case (FLASH_WORD_SIZE)SST_ID_xF800A:
+ info->flash_id += FLASH_SST800A;
+ info->sector_count = 16;
+ info->size = 0x00100000;
+ break; /* => 1 MB */
+
+ case (FLASH_WORD_SIZE)SST_ID_xF160A:
+ info->flash_id += FLASH_SST160A;
+ info->sector_count = 32;
+ info->size = 0x00200000;
+ break; /* => 2 MB */
+
+ case (FLASH_WORD_SIZE)AMD_ID_F040B:
+ info->flash_id += FLASH_AM040;
+ info->sector_count = 8;
+ info->size = 0x00080000;
+ break; /* => 0.5 MB */
+
+ default:
+ info->flash_id = FLASH_UNKNOWN;
+ return (0); /* => no or unknown flash */
+
+ }
+
+ printf("flash id %lx; sector count %x, size %lx\n", info->flash_id,info->sector_count,info->size);
+ /* set up sector start address table */
+ if (info->flash_id & FLASH_MAN_SST)
+ {
+ 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 + 0x00004000;
+ info->start[2] = base + 0x00006000;
+ info->start[3] = base + 0x00008000;
+ for (i = 4; i < info->sector_count; i++) {
+ info->start[i] = base + (i * 0x00010000) - 0x00030000;
+ }
+ } else {
+ /* set sector offsets for top boot block type */
+ i = info->sector_count - 1;
+ info->start[i--] = base + info->size - 0x00004000;
+ info->start[i--] = base + info->size - 0x00006000;
+ info->start[i--] = base + info->size - 0x00008000;
+ for (; i >= 0; i--) {
+ info->start[i] = base + i * 0x00010000;
+ }
+ }
+
+ /* 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 */
+ addr2 = (volatile FLASH_WORD_SIZE *)(info->start[i]);
+ if (info->flash_id & FLASH_MAN_SST)
+ info->protect[i] = 0;
+ else
+ info->protect[i] = addr2[2] & 1;
+ }
+
+ /*
+ * Prevent writes to uninitialized FLASH.
+ */
+ if (info->flash_id != FLASH_UNKNOWN) {
+ addr2 = (FLASH_WORD_SIZE *)info->start[0];
+ *addr2 = (FLASH_WORD_SIZE)0x00F000F0; /* reset bank */
+ }
+
+ return (info->size);
+}
+
+#endif
+
+
+int
+flash_erase(flash_info_t *info, int s_first, int s_last)
+{
+ volatile FLASH_WORD_SIZE *addr = (FLASH_WORD_SIZE *)(info->start[0]);
+ int flag, prot, sect, l_sect;
+ ulong start, now, last;
+ unsigned char sh8b;
+
+ 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_MAN_STM | FLASH_AMD_COMP))) {
+ printf ("Can't erase unknown flash type - aborted\n");
+ 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;
+
+ /* Check the ROM CS */
+ if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
+ sh8b = 3;
+ else
+ sh8b = 0;
+
+ /* Disable interrupts which might cause a timeout here */
+ flag = disable_interrupts();
+
+ addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
+ addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
+ addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
+ addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
+ addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
+
+ /* Start erase on unprotected sectors */
+ for (sect = s_first; sect<=s_last; sect++) {
+ if (info->protect[sect] == 0) { /* not protected */
+ addr = (FLASH_WORD_SIZE *)(info->start[0] + (
+ (info->start[sect] - info->start[0]) << sh8b));
+ if (info->flash_id & FLASH_MAN_SST)
+ {
+ addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
+ addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
+ addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00800080;
+ addr[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
+ addr[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
+ addr[0] = (FLASH_WORD_SIZE)0x00500050; /* block erase */
+ udelay(30000); /* wait 30 ms */
+ }
+ else
+ addr[0] = (FLASH_WORD_SIZE)0x00300030; /* sector erase */
+ 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 = (FLASH_WORD_SIZE *)(info->start[0] + (
+ (info->start[l_sect] - info->start[0]) << sh8b));
+ while ((addr[0] & (FLASH_WORD_SIZE)0x00800080) != (FLASH_WORD_SIZE)0x00800080) {
+ 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 */
+ serial_putc ('.');
+ last = now;
+ }
+ }
+
+DONE:
+ /* reset to read mode */
+ addr = (FLASH_WORD_SIZE *)info->start[0];
+ addr[0] = (FLASH_WORD_SIZE)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, 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
+ */
+static int write_word (flash_info_t *info, ulong dest, ulong data)
+{
+ volatile FLASH_WORD_SIZE *addr2 = (FLASH_WORD_SIZE *)info->start[0];
+ volatile FLASH_WORD_SIZE *dest2;
+ volatile FLASH_WORD_SIZE *data2 = (FLASH_WORD_SIZE *)&data;
+ ulong start;
+ int flag;
+ int i;
+ unsigned char sh8b;
+
+ /* Check the ROM CS */
+ if ((info->start[0] >= ROM_CS1_START) && (info->start[0] < ROM_CS0_START))
+ sh8b = 3;
+ else
+ sh8b = 0;
+
+ dest2 = (FLASH_WORD_SIZE *)(((dest - info->start[0]) << sh8b) +
+ info->start[0]);
+
+ /* Check if Flash is (sufficiently) erased */
+ if ((*dest2 & (FLASH_WORD_SIZE)data) != (FLASH_WORD_SIZE)data) {
+ return (2);
+ }
+ /* Disable interrupts which might cause a timeout here */
+ flag = disable_interrupts();
+
+ for (i=0; i<4/sizeof(FLASH_WORD_SIZE); i++)
+ {
+ addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00AA00AA;
+ addr2[ADDR1 << sh8b] = (FLASH_WORD_SIZE)0x00550055;
+ addr2[ADDR0 << sh8b] = (FLASH_WORD_SIZE)0x00A000A0;
+
+ dest2[i << sh8b] = data2[i];
+
+ /* re-enable interrupts if necessary */
+ if (flag)
+ enable_interrupts();
+
+ /* data polling for D7 */
+ start = get_timer (0);
+ while ((dest2[i << sh8b] & (FLASH_WORD_SIZE)0x00800080) !=
+ (data2[i] & (FLASH_WORD_SIZE)0x00800080)) {
+ if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+ return (1);
+ }
+ }
+ }
+
+ return (0);
+}
+
+/*-----------------------------------------------------------------------
+ */
generated by cgit v1.1 at 2024-12-27 22:32:21 +0000