Initial revision

1 files changed, 491 insertions, 0 deletions

diff --git a/board/smdk2400/flash.c b/board/smdk2400/flash.c
new file mode 100644
index 0000000..c4d6bae
--- /dev/null
+++ b/board/smdk2400/flash.c
@@ -0,0 +1,491 @@
+/*
+ * (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);
+}