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-rw-r--r--board/smdk2400/flash.c491
1 files changed, 491 insertions, 0 deletions
diff --git a/board/smdk2400/flash.c b/board/smdk2400/flash.c
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+/*
+ * (C) Copyright 2002
+ * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
+ * Marius Groeger <mgroeger@sysgo.de>
+ *
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj@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
+ */
+
+/* #define DEBUG */
+
+#include <common.h>
+#include <environment.h>
+
+#define FLASH_BANK_SIZE 0x1000000 /* 2 x 8 MB */
+#define MAIN_SECT_SIZE 0x40000 /* 2 x 128 kB */
+
+flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
+
+
+#define CMD_READ_ARRAY 0x00FF00FF
+#define CMD_IDENTIFY 0x00900090
+#define CMD_ERASE_SETUP 0x00200020
+#define CMD_ERASE_CONFIRM 0x00D000D0
+#define CMD_PROGRAM 0x00400040
+#define CMD_RESUME 0x00D000D0
+#define CMD_SUSPEND 0x00B000B0
+#define CMD_STATUS_READ 0x00700070
+#define CMD_STATUS_RESET 0x00500050
+
+#define BIT_BUSY 0x00800080
+#define BIT_ERASE_SUSPEND 0x00400040
+#define BIT_ERASE_ERROR 0x00200020
+#define BIT_PROGRAM_ERROR 0x00100010
+#define BIT_VPP_RANGE_ERROR 0x00080008
+#define BIT_PROGRAM_SUSPEND 0x00040004
+#define BIT_PROTECT_ERROR 0x00020002
+#define BIT_UNDEFINED 0x00010001
+
+#define BIT_SEQUENCE_ERROR 0x00300030
+#define BIT_TIMEOUT 0x80000000
+
+/*-----------------------------------------------------------------------
+ */
+
+ulong flash_init (void)
+{
+ int i, j;
+ ulong size = 0;
+
+ for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
+ ulong flashbase = 0;
+
+ flash_info[i].flash_id =
+ (INTEL_MANUFACT & FLASH_VENDMASK) |
+ (INTEL_ID_28F640J3A & FLASH_TYPEMASK);
+ flash_info[i].size = FLASH_BANK_SIZE;
+ flash_info[i].sector_count = CFG_MAX_FLASH_SECT;
+ memset (flash_info[i].protect, 0, CFG_MAX_FLASH_SECT);
+ if (i == 0)
+ flashbase = PHYS_FLASH_1;
+ else
+ panic ("configured too many flash banks!\n");
+ for (j = 0; j < flash_info[i].sector_count; j++) {
+ flash_info[i].start[j] = flashbase;
+
+ /* uniform sector size */
+ flashbase += MAIN_SECT_SIZE;
+ }
+ size += flash_info[i].size;
+ }
+
+ /*
+ * Protect monitor and environment sectors
+ */
+ flash_protect ( FLAG_PROTECT_SET,
+ CFG_FLASH_BASE,
+ CFG_FLASH_BASE + _armboot_end_data - _armboot_start,
+ &flash_info[0]);
+
+ flash_protect ( FLAG_PROTECT_SET,
+ CFG_ENV_ADDR,
+ CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0]);
+
+#ifdef CFG_ENV_ADDR_REDUND
+ flash_protect ( FLAG_PROTECT_SET,
+ CFG_ENV_ADDR_REDUND,
+ CFG_ENV_ADDR_REDUND + CFG_ENV_SIZE_REDUND - 1,
+ &flash_info[0]);
+#endif
+
+ return size;
+}
+
+/*-----------------------------------------------------------------------
+ */
+void flash_print_info (flash_info_t * info)
+{
+ int i;
+
+ switch (info->flash_id & FLASH_VENDMASK) {
+ case (INTEL_MANUFACT & FLASH_VENDMASK):
+ printf ("Intel: ");
+ break;
+ default:
+ printf ("Unknown Vendor ");
+ break;
+ }
+
+ switch (info->flash_id & FLASH_TYPEMASK) {
+ case (INTEL_ID_28F640J3A & FLASH_TYPEMASK):
+ printf ("2x 28F640J3A (64Mbit)\n");
+ break;
+ default:
+ printf ("Unknown Chip Type\n");
+ goto Done;
+ 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");
+
+ Done:
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+int flash_error (ulong code)
+{
+ /* Check bit patterns */
+ /* SR.7=0 is busy, SR.7=1 is ready */
+ /* all other flags indicate error on 1 */
+ /* SR.0 is undefined */
+ /* Timeout is our faked flag */
+
+ /* sequence is described in Intel 290644-005 document */
+
+ /* check Timeout */
+ if (code & BIT_TIMEOUT) {
+ puts ("Timeout\n");
+ return ERR_TIMOUT;
+ }
+
+ /* check Busy, SR.7 */
+ if (~code & BIT_BUSY) {
+ puts ("Busy\n");
+ return ERR_PROG_ERROR;
+ }
+
+ /* check Vpp low, SR.3 */
+ if (code & BIT_VPP_RANGE_ERROR) {
+ puts ("Vpp range error\n");
+ return ERR_PROG_ERROR;
+ }
+
+ /* check Device Protect Error, SR.1 */
+ if (code & BIT_PROTECT_ERROR) {
+ puts ("Device protect error\n");
+ return ERR_PROG_ERROR;
+ }
+
+ /* check Command Seq Error, SR.4 & SR.5 */
+ if (code & BIT_SEQUENCE_ERROR) {
+ puts ("Command seqence error\n");
+ return ERR_PROG_ERROR;
+ }
+
+ /* check Block Erase Error, SR.5 */
+ if (code & BIT_ERASE_ERROR) {
+ puts ("Block erase error\n");
+ return ERR_PROG_ERROR;
+ }
+
+ /* check Program Error, SR.4 */
+ if (code & BIT_PROGRAM_ERROR) {
+ puts ("Program error\n");
+ return ERR_PROG_ERROR;
+ }
+
+ /* check Block Erase Suspended, SR.6 */
+ if (code & BIT_ERASE_SUSPEND) {
+ puts ("Block erase suspended\n");
+ return ERR_PROG_ERROR;
+ }
+
+ /* check Program Suspended, SR.2 */
+ if (code & BIT_PROGRAM_SUSPEND) {
+ puts ("Program suspended\n");
+ return ERR_PROG_ERROR;
+ }
+
+ /* OK, no error */
+ return ERR_OK;
+}
+
+/*-----------------------------------------------------------------------
+ */
+
+int flash_erase (flash_info_t * info, int s_first, int s_last)
+{
+ ulong result, result1;
+ int iflag, prot, sect;
+ int rc = ERR_OK;
+
+#ifdef USE_920T_MMU
+ int cflag;
+#endif
+
+ debug ("flash_erase: s_first %d s_last %d\n", s_first, s_last);
+
+ /* first look for protection bits */
+
+ if (info->flash_id == FLASH_UNKNOWN)
+ return ERR_UNKNOWN_FLASH_TYPE;
+
+ if ((s_first < 0) || (s_first > s_last)) {
+ return ERR_INVAL;
+ }
+
+ if ((info->flash_id & FLASH_VENDMASK) !=
+ (INTEL_MANUFACT & FLASH_VENDMASK)) {
+ return ERR_UNKNOWN_FLASH_VENDOR;
+ }
+
+ 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");
+ }
+
+ /*
+ * Disable interrupts which might cause a timeout
+ * here. Remember that our exception vectors are
+ * at address 0 in the flash, and we don't want a
+ * (ticker) exception to happen while the flash
+ * chip is in programming mode.
+ */
+#ifdef USE_920T_MMU
+ cflag = dcache_status ();
+ dcache_disable ();
+#endif
+ iflag = disable_interrupts ();
+
+ /* Start erase on unprotected sectors */
+ for (sect = s_first; sect <= s_last && !ctrlc (); sect++) {
+
+ debug ("Erasing sector %2d @ %08lX... ",
+ sect, info->start[sect]);
+
+ /* arm simple, non interrupt dependent timer */
+ reset_timer_masked ();
+
+ if (info->protect[sect] == 0) { /* not protected */
+ vu_long *addr = (vu_long *) (info->start[sect]);
+ ulong bsR7, bsR7_2, bsR5, bsR5_2;
+
+ /* *addr = CMD_STATUS_RESET; */
+ *addr = CMD_ERASE_SETUP;
+ *addr = CMD_ERASE_CONFIRM;
+
+ /* wait until flash is ready */
+ do {
+ /* check timeout */
+ if (get_timer_masked () > CFG_FLASH_ERASE_TOUT) {
+ *addr = CMD_STATUS_RESET;
+ result = BIT_TIMEOUT;
+ break;
+ }
+
+ *addr = CMD_STATUS_READ;
+ result = *addr;
+ bsR7 = result & (1 << 7);
+ bsR7_2 = result & (1 << 23);
+ } while (!bsR7 | !bsR7_2);
+
+ *addr = CMD_STATUS_READ;
+ result1 = *addr;
+ bsR5 = result1 & (1 << 5);
+ bsR5_2 = result1 & (1 << 21);
+#ifdef SAMSUNG_FLASH_DEBUG
+ printf ("bsR5 %lx bsR5_2 %lx\n", bsR5, bsR5_2);
+ if (bsR5 != 0 && bsR5_2 != 0)
+ printf ("bsR5 %lx bsR5_2 %lx\n", bsR5, bsR5_2);
+#endif
+
+ *addr = CMD_READ_ARRAY;
+ *addr = CMD_RESUME;
+
+ if ((rc = flash_error (result)) != ERR_OK)
+ goto outahere;
+#if 0
+ printf ("ok.\n");
+ } else { /* it was protected */
+
+ printf ("protected!\n");
+#endif
+ }
+ }
+
+outahere:
+ /* allow flash to settle - wait 10 ms */
+ udelay_masked (10000);
+
+ if (iflag)
+ enable_interrupts ();
+
+#ifdef USE_920T_MMU
+ if (cflag)
+ dcache_enable ();
+#endif
+ return rc;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash
+ */
+
+volatile static int write_word (flash_info_t * info, ulong dest,
+ ulong data)
+{
+ vu_long *addr = (vu_long *) dest;
+ ulong result;
+ int rc = ERR_OK;
+ int iflag;
+
+#ifdef USE_920T_MMU
+ int cflag;
+#endif
+
+ /*
+ * Check if Flash is (sufficiently) erased
+ */
+ result = *addr;
+ if ((result & data) != data)
+ return ERR_NOT_ERASED;
+
+ /*
+ * Disable interrupts which might cause a timeout
+ * here. Remember that our exception vectors are
+ * at address 0 in the flash, and we don't want a
+ * (ticker) exception to happen while the flash
+ * chip is in programming mode.
+ */
+#ifdef USE_920T_MMU
+ cflag = dcache_status ();
+ dcache_disable ();
+#endif
+ iflag = disable_interrupts ();
+
+ /* *addr = CMD_STATUS_RESET; */
+ *addr = CMD_PROGRAM;
+ *addr = data;
+
+ /* arm simple, non interrupt dependent timer */
+ reset_timer_masked ();
+
+ /* wait until flash is ready */
+ do {
+ /* check timeout */
+ if (get_timer_masked () > CFG_FLASH_ERASE_TOUT) {
+ *addr = CMD_SUSPEND;
+ result = BIT_TIMEOUT;
+ break;
+ }
+
+ *addr = CMD_STATUS_READ;
+ result = *addr;
+ } while (~result & BIT_BUSY);
+
+ /* *addr = CMD_READ_ARRAY; */
+ *addr = CMD_STATUS_READ;
+ result = *addr;
+
+ rc = flash_error (result);
+
+ if (iflag)
+ enable_interrupts ();
+
+#ifdef USE_920T_MMU
+ if (cflag)
+ dcache_enable ();
+#endif
+ *addr = CMD_READ_ARRAY;
+ *addr = CMD_RESUME;
+ return rc;
+}
+
+/*-----------------------------------------------------------------------
+ * Copy memory to flash.
+ */
+
+int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
+{
+ ulong cp, wp, data;
+ int l;
+ int i, 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 << 24);
+ }
+ for (; i < 4 && cnt > 0; ++i) {
+ data = (data >> 8) | (*src++ << 24);
+ --cnt;
+ ++cp;
+ }
+ for (; cnt == 0 && i < 4; ++i, ++cp) {
+ data = (data >> 8) | (*(uchar *) cp << 24);
+ }
+
+ if ((rc = write_word (info, wp, data)) != 0) {
+ return (rc);
+ }
+ wp += 4;
+ }
+
+ /*
+ * handle word aligned part
+ */
+ while (cnt >= 4) {
+ data = *((vu_long *) src);
+ if ((rc = write_word (info, wp, data)) != 0) {
+ return (rc);
+ }
+ src += 4;
+ wp += 4;
+ cnt -= 4;
+ }
+
+ if (cnt == 0) {
+ return ERR_OK;
+ }
+
+ /*
+ * handle unaligned tail bytes
+ */
+ data = 0;
+ for (i = 0, cp = wp; i < 4 && cnt > 0; ++i, ++cp) {
+ data = (data >> 8) | (*src++ << 24);
+ --cnt;
+ }
+ for (; i < 4; ++i, ++cp) {
+ data = (data >> 8) | (*(uchar *) cp << 24);
+ }
+
+ return write_word (info, wp, data);
+}
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