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-rw-r--r--board/oxc/flash.c372
1 files changed, 372 insertions, 0 deletions
diff --git a/board/oxc/flash.c b/board/oxc/flash.c
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+++ b/board/oxc/flash.c
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+/*
+ * (C) Copyright 2000
+ * Marius Groeger <mgroeger@sysgo.de>
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ *
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * Flash Routines for STM29W320DB/STM29W800D flash chips
+ *
+ *--------------------------------------------------------------------
+ * 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]; /* info for FLASH chips */
+
+/*-----------------------------------------------------------------------
+ * Functions
+ */
+
+static ulong flash_get_size (vu_char *addr, flash_info_t *info);
+static int write_byte (flash_info_t *info, ulong dest, uchar data);
+
+/*-----------------------------------------------------------------------
+ */
+
+unsigned long flash_init (void)
+{
+ unsigned long size;
+ int i;
+
+ /* Init: no FLASHes known */
+ for (i=0; i<CFG_MAX_FLASH_BANKS; ++i) {
+ flash_info[i].flash_id = FLASH_UNKNOWN;
+ }
+
+ /*
+ * We use the following trick here: since flash is cyclically
+ * mapped in the 0xFF800000-0xFFFFFFFF area, we detect the type
+ * and the size of flash using 0xFF800000 as the base address,
+ * and then call flash_get_size() again to fill flash_info.
+ */
+ size = flash_get_size((vu_char *)CFG_FLASH_PRELIMBASE, &flash_info[0]);
+ if (size)
+ {
+ flash_get_size((vu_char *)(-size), &flash_info[0]);
+ }
+
+#if (CFG_MONITOR_BASE >= CFG_FLASH_PRELIMBASE)
+ /* monitor protection ON by default */
+ 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)
+# 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);
+}
+
+/*-----------------------------------------------------------------------
+ */
+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_STM:
+ printf ("ST ");
+ break;
+ default:
+ printf ("Unknown Vendor ");
+ break;
+ }
+
+ switch (info->flash_id & FLASH_TYPEMASK) {
+ case FLASH_STM320DB:
+ printf ("M29W320DB (32 Mbit)\n");
+ break;
+ case FLASH_STM800DB:
+ printf ("M29W800DB (8 Mbit, bottom boot block)\n");
+ break;
+ case FLASH_STM800DT:
+ printf ("M29W800DT (8 Mbit, top boot block)\n");
+ break;
+ default:
+ printf ("Unknown Chip Type\n");
+ break;
+ }
+
+ printf (" Size: %ld KB in %d Sectors\n",
+ info->size >> 10, 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_char *addr, flash_info_t *info)
+{
+ short i;
+ uchar vendor, devid;
+ ulong base = (ulong)addr;
+
+ /* Write auto select command: read Manufacturer ID */
+ addr[0x0AAA] = 0xAA;
+ addr[0x0555] = 0x55;
+ addr[0x0AAA] = 0x90;
+
+ udelay(1000);
+
+ vendor = addr[0];
+ devid = addr[2];
+
+ /* only support STM */
+ if ((vendor << 16) != FLASH_MAN_STM) {
+ return 0;
+ }
+
+ if (devid == FLASH_STM320DB) {
+ /* MPC8240 can address maximum 2Mb of flash, that is why the MSB
+ * lead is grounded and we can access only 2 first Mb */
+ info->flash_id = vendor << 16 | devid;
+ info->sector_count = 32;
+ info->size = info->sector_count * 0x10000;
+ for (i = 0; i < info->sector_count; i++) {
+ info->start[i] = base + i * 0x10000;
+ }
+ }
+ else if (devid == FLASH_STM800DB) {
+ info->flash_id = vendor << 16 | devid;
+ info->sector_count = 19;
+ info->size = 0x100000;
+ info->start[0] = 0x0000;
+ info->start[1] = 0x4000;
+ info->start[2] = 0x6000;
+ info->start[3] = 0x8000;
+ for (i = 4; i < info->sector_count; i++) {
+ info->start[i] = base + (i-3) * 0x10000;
+ }
+ }
+ else if (devid == FLASH_STM800DT) {
+ info->flash_id = vendor << 16 | devid;
+ info->sector_count = 19;
+ info->size = 0x100000;
+ for (i = 0; i < info->sector_count-4; i++) {
+ info->start[i] = base + i * 0x10000;
+ }
+ info->start[i] = base + i * 0x10000;
+ info->start[i+1] = base + i * 0x10000 + 0x8000;
+ info->start[i+2] = base + i * 0x10000 + 0xa000;
+ info->start[i+3] = base + i * 0x10000 + 0xc000;
+ }
+ else {
+ return 0;
+ }
+
+ /* mark all sectors as unprotected */
+ for (i = 0; i < info->sector_count; i++) {
+ info->protect[i] = 0;
+ }
+
+ /* Issue the reset command */
+ if (info->flash_id != FLASH_UNKNOWN) {
+ addr[0] = 0xF0; /* reset bank */
+ }
+
+ return (info->size);
+}
+
+
+/*-----------------------------------------------------------------------
+ */
+
+int flash_erase (flash_info_t *info, int s_first, int s_last)
+{
+ vu_char *addr = (vu_char *)(info->start[0]);
+ int flag, prot, sect, l_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");
+ }
+
+ l_sect = -1;
+
+ /* Disable interrupts which might cause a timeout here */
+ flag = disable_interrupts();
+
+ addr[0x0AAA] = 0xAA;
+ addr[0x0555] = 0x55;
+ addr[0x0AAA] = 0x80;
+ addr[0x0AAA] = 0xAA;
+ addr[0x0555] = 0x55;
+
+ /* wait at least 80us - let's wait 1 ms */
+ udelay (1000);
+
+ /* Start erase on unprotected sectors */
+ for (sect = s_first; sect<=s_last; sect++) {
+ if (info->protect[sect] == 0) { /* not protected */
+ addr = (vu_char *)(info->start[sect]);
+ 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 = (vu_char *)(info->start[l_sect]);
+ 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 */
+ serial_putc ('.');
+ last = now;
+ }
+ }
+
+ DONE:
+ /* reset to read mode */
+ addr = (volatile unsigned char *)info->start[0];
+ addr[0] = 0xF0; /* 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)
+{
+ int rc;
+
+ while (cnt > 0) {
+ if ((rc = write_byte(info, addr, *src)) != 0) {
+ return (rc);
+ }
+ addr++;
+ src++;
+ cnt--;
+ }
+
+ return (0);
+}
+
+/*-----------------------------------------------------------------------
+ * Write a byte to Flash, returns:
+ * 0 - OK
+ * 1 - write timeout
+ * 2 - Flash not erased
+ */
+static int write_byte (flash_info_t *info, ulong dest, uchar data)
+{
+ vu_char *addr = (vu_char *)(info->start[0]);
+ ulong start;
+ int flag;
+
+ /* Check if Flash is (sufficiently) erased */
+ if ((*((vu_char *)dest) & data) != data) {
+ return (2);
+ }
+ /* Disable interrupts which might cause a timeout here */
+ flag = disable_interrupts();
+
+ addr[0x0AAA] = 0xAA;
+ addr[0x0555] = 0x55;
+ addr[0x0AAA] = 0xA0;
+
+ *((vu_char *)dest) = data;
+
+ /* re-enable interrupts if necessary */
+ if (flag)
+ enable_interrupts();
+
+ /* data polling for D7 */
+ start = get_timer (0);
+ while ((*((vu_char *)dest) & 0x80) != (data & 0x80)) {
+ if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
+ return (1);
+ }
+ }
+ return (0);
+}
+
+/*-----------------------------------------------------------------------
+ */
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