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-rw-r--r--board/pm826/flash.c377
1 files changed, 377 insertions, 0 deletions
diff --git a/board/pm826/flash.c b/board/pm826/flash.c
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--- /dev/null
+++ b/board/pm826/flash.c
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+/*
+ * (C) Copyright 2001, 2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Flash Routines for Intel devices
+ *
+ *--------------------------------------------------------------------
+ * 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 <mpc8xx.h>
+
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
+
+/*-----------------------------------------------------------------------
+ */
+ulong flash_get_size (volatile unsigned long *baseaddr,
+ flash_info_t * info)
+{
+ short i;
+ unsigned long flashtest_h, flashtest_l;
+
+ info->sector_count = info->size = 0;
+ info->flash_id = FLASH_UNKNOWN;
+
+ /* Write query command sequence and test FLASH answer
+ */
+ baseaddr[0] = 0x00980098;
+ baseaddr[1] = 0x00980098;
+
+ flashtest_h = baseaddr[0]; /* manufacturer ID */
+ flashtest_l = baseaddr[1];
+
+ if (flashtest_h != INTEL_MANUFACT || flashtest_l != INTEL_MANUFACT)
+ return (0); /* no or unknown flash */
+
+ flashtest_h = baseaddr[2]; /* device ID */
+ flashtest_l = baseaddr[3];
+
+ if (flashtest_h != flashtest_l)
+ return (0);
+
+ switch (flashtest_h) {
+ case INTEL_ID_28F160C3B:
+ info->flash_id = FLASH_28F160C3B;
+ info->sector_count = 39;
+ info->size = 0x00800000; /* 4 * 2 MB = 8 MB */
+ break;
+ case INTEL_ID_28F160F3B:
+ info->flash_id = FLASH_28F160F3B;
+ info->sector_count = 39;
+ info->size = 0x00800000; /* 4 * 2 MB = 8 MB */
+ break;
+ default:
+ return (0); /* no or unknown flash */
+ }
+
+ info->flash_id |= INTEL_MANUFACT << 16; /* set manufacturer offset */
+
+ if (info->flash_id & FLASH_BTYPE) {
+ volatile unsigned long *tmp = baseaddr;
+
+ /* set up sector start adress table (bottom sector type)
+ * AND unlock the sectors (if our chip is 160C3)
+ */
+ for (i = 0; i < info->sector_count; i++) {
+ if ((info->flash_id & FLASH_TYPEMASK) == FLASH_28F160C3B) {
+ tmp[0] = 0x00600060;
+ tmp[1] = 0x00600060;
+ tmp[0] = 0x00D000D0;
+ tmp[1] = 0x00D000D0;
+ }
+ info->start[i] = (uint) tmp;
+ tmp += i < 8 ? 0x2000 : 0x10000; /* pointer arith */
+ }
+ }
+
+ memset (info->protect, 0, info->sector_count);
+
+ baseaddr[0] = 0x00FF00FF;
+ baseaddr[1] = 0x00FF00FF;
+
+ return (info->size);
+}
+
+/*-----------------------------------------------------------------------
+ */
+unsigned long flash_init (void)
+{
+ unsigned long size_b0 = 0;
+ int i;
+
+ /* Init: no FLASHes known
+ */
+ for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) {
+ flash_info[i].flash_id = FLASH_UNKNOWN;
+ }
+
+ /* Static FLASH Bank configuration here (only one bank) */
+
+ size_b0 = flash_get_size ((ulong *) CFG_FLASH0_BASE, &flash_info[0]);
+ if (flash_info[0].flash_id == FLASH_UNKNOWN || size_b0 == 0) {
+ printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
+ size_b0, size_b0 >> 20);
+ }
+
+ /* protect monitor and environment sectors
+ */
+
+#ifndef CONFIG_BOOT_ROM
+ /* If U-Boot is booted from ROM the CFG_MONITOR_BASE > CFG_FLASH0_BASE
+ * but we shouldn't protect it.
+ */
+
+# if CFG_MONITOR_BASE >= CFG_FLASH0_BASE
+ flash_protect (FLAG_PROTECT_SET,
+ CFG_MONITOR_BASE,
+ CFG_MONITOR_BASE + CFG_MONITOR_LEN - 1, &flash_info[0]
+ );
+# endif
+#endif /* CONFIG_BOOT_ROM */
+
+#if (CFG_ENV_IS_IN_FLASH == 1) && defined(CFG_ENV_ADDR)
+# ifndef CFG_ENV_SIZE
+# define CFG_ENV_SIZE CFG_ENV_SECT_SIZE
+# endif
+ flash_protect (FLAG_PROTECT_SET,
+ CFG_ENV_ADDR,
+ CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0]);
+#endif
+
+ return (size_b0);
+}
+
+/*-----------------------------------------------------------------------
+ */
+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 >> 16) & 0xff) {
+ case 0x89:
+ printf ("INTEL ");
+ break;
+ default:
+ printf ("Unknown Vendor ");
+ break;
+ }
+
+ switch (info->flash_id & FLASH_TYPEMASK) {
+ case FLASH_28F160C3B:
+ printf ("28F160C3B (16 M, bottom sector)\n");
+ break;
+ case FLASH_28F160F3B:
+ printf ("28F160F3B (16 M, bottom sector)\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");
+}
+
+/*-----------------------------------------------------------------------
+ */
+int flash_erase (flash_info_t * info, int s_first, int s_last)
+{
+ int flag, prot, sect;
+ ulong start, now, 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;
+ }
+
+ 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");
+ }
+
+ /* Start erase on unprotected sectors
+ */
+ for (sect = s_first; sect <= s_last; sect++) {
+ volatile ulong *addr =
+ (volatile unsigned long *) info->start[sect];
+
+ start = get_timer (0);
+ last = start;
+ if (info->protect[sect] == 0) {
+ /* Disable interrupts which might cause a timeout here
+ */
+ flag = disable_interrupts ();
+
+ /* Erase the block
+ */
+ addr[0] = 0x00200020;
+ addr[1] = 0x00200020;
+ addr[0] = 0x00D000D0;
+ addr[1] = 0x00D000D0;
+
+ /* re-enable interrupts if necessary
+ */
+ if (flag)
+ enable_interrupts ();
+
+ /* wait at least 80us - let's wait 1 ms
+ */
+ udelay (1000);
+
+ last = start;
+ while ((addr[0] & 0x00800080) != 0x00800080 ||
+ (addr[1] & 0x00800080) != 0x00800080) {
+ if ((now = get_timer (start)) > CFG_FLASH_ERASE_TOUT) {
+ printf ("Timeout (erase suspended!)\n");
+ /* Suspend erase
+ */
+ addr[0] = 0x00B000B0;
+ addr[1] = 0x00B000B0;
+ goto DONE;
+ }
+ /* show that we're waiting
+ */
+ if ((now - last) > 1000) { /* every second */
+ serial_putc ('.');
+ last = now;
+ }
+ }
+ if (addr[0] & 0x00220022 || addr[1] & 0x00220022) {
+ printf ("*** ERROR: erase failed!\n");
+ goto DONE;
+ }
+ }
+ /* Clear status register and reset to read mode
+ */
+ addr[0] = 0x00500050;
+ addr[1] = 0x00500050;
+ addr[0] = 0x00FF00FF;
+ addr[1] = 0x00FF00FF;
+ }
+
+ printf (" done\n");
+
+DONE:
+ return 0;
+}
+
+static int write_word (flash_info_t *, volatile unsigned long *, ulong);
+
+/*-----------------------------------------------------------------------
+ * 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 v;
+ int i, l, cc = cnt, res = 0;
+
+
+ for (v=0; cc > 0; addr += 4, cc -= 4 - l) {
+ l = (addr & 3);
+ addr &= ~3;
+
+ for (i = 0; i < 4; i++) {
+ v = (v << 8) + (i < l || i - l >= cc ?
+ *((unsigned char *) addr + i) : *src++);
+ }
+
+ if ((res = write_word (info, (volatile unsigned long *) addr, v)) != 0)
+ break;
+ }
+
+ return (res);
+}
+
+/*-----------------------------------------------------------------------
+ * Write a word to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_word (flash_info_t * info, volatile unsigned long *addr,
+ ulong data)
+{
+ int flag, res = 0;
+ ulong start;
+
+ /* Check if Flash is (sufficiently) erased
+ */
+ if ((*addr & data) != data)
+ return (2);
+
+ /* Disable interrupts which might cause a timeout here
+ */
+ flag = disable_interrupts ();
+
+ *addr = 0x00400040;
+ *addr = data;
+
+ /* re-enable interrupts if necessary
+ */
+ if (flag)
+ enable_interrupts ();
+
+ start = get_timer (0);
+ while ((*addr & 0x00800080) != 0x00800080) {
+ if (get_timer (start) > CFG_FLASH_WRITE_TOUT) {
+ /* Suspend program
+ */
+ *addr = 0x00B000B0;
+ res = 1;
+ goto OUT;
+ }
+ }
+
+ if (*addr & 0x00220022) {
+ printf ("*** ERROR: program failed!\n");
+ res = 1;
+ }
+
+OUT:
+ /* Clear status register and reset to read mode
+ */
+ *addr = 0x00500050;
+ *addr = 0x00FF00FF;
+
+ return (res);
+}