flash.c

u-boot 源代码

/*
 * (C) Copyright 2000-2003
 * Wolfgang Denk, DENX Software Engineering, [e-mail].
 *
 * Copyright (C) 2004-2007 Freescale Semiconductor, Inc.
 * TsiChung Liew ([e-mail])
 *
 * 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 <asm/immap.h>

#ifndef CFG_FLASH_CFI
typedef unsigned char FLASH_PORT_WIDTH;
typedef volatile unsigned char FLASH_PORT_WIDTHV;

#define FPW             FLASH_PORT_WIDTH
#define FPWV            FLASH_PORT_WIDTHV

#define CFG_FLASH_CFI_WIDTH	FLASH_CFI_8BIT
#define CFG_FLASH_NONCFI_WIDTH	FLASH_CFI_8BIT

/* Intel-compatible flash commands */
#define INTEL_PROGRAM   0x00100010
#define INTEL_ERASE     0x00200020
#define INTEL_WRSETUP	0x00400040
#define INTEL_CLEAR     0x00500050
#define INTEL_LOCKBIT   0x00600060
#define INTEL_PROTECT   0x00010001
#define INTEL_STATUS    0x00700070
#define INTEL_READID    0x00900090
#define INTEL_CFIQRY	0x00980098
#define INTEL_SUSERASE	0x00B000B0
#define INTEL_PROTPROG	0x00C000C0
#define INTEL_CONFIRM   0x00D000D0
#define INTEL_WRBLK	0x00e800e8
#define INTEL_RESET     0x00FF00FF

/* Intel-compatible flash status bits */
#define INTEL_FINISHED  0x00800080
#define INTEL_OK        0x00800080
#define INTEL_ERASESUS  0x00600060
#define INTEL_WSM_SUS   (INTEL_FINISHED | INTEL_ERASESUS)

/* 28F160C3B CFI Data offset - This could vary */
#define INTEL_CFI_MFG	0x00	/* Manufacturer ID */
#define INTEL_CFI_PART	0x01	/* Product ID */
#define INTEL_CFI_LOCK  0x02	/* */
#define INTEL_CFI_TWPRG 0x1F	/* Typical Single Word Program Timeout 2^n us */
#define INTEL_CFI_MBUFW 0x20	/* Typical Max Buffer Write Timeout 2^n us */
#define INTEL_CFI_TERB	0x21	/* Typical Block Erase Timeout 2^n ms */
#define INTEL_CFI_MWPRG 0x23	/* Maximum Word program timeout 2^n us */
#define INTEL_CFI_MERB  0x25	/* Maximum Block Erase Timeout 2^n s */
#define INTEL_CFI_SIZE	0x27	/* Device size 2^n bytes */
#define INTEL_CFI_CAP	0x28
#define INTEL_CFI_WRBUF	0x2A
#define INTEL_CFI_BANK	0x2C	/* Number of Bank */
#define INTEL_CFI_BLK1A	0x2D	/* Number of Blocks */
#define INTEL_CFI_BLK1B	0x2E	/* Number of Blocks */
#define INTEL_CFI_SZ1A	0x2F	/* Block Region Size */
#define INTEL_CFI_SZ1B	0x30
#define INTEL_CFI_BLK2A	0x31
#define INTEL_CFI_BLK2B	0x32
#define INTEL_CFI_SZ2A	0x33
#define INTEL_CFI_SZ2B	0x34

#define FLASH_CYCLE1    0x0555
#define FLASH_CYCLE2    0x0aaa

#define WR_BLOCK        0x20

/* not in the flash.h yet */
#define FLASH_28F64P30T		0x00B9	/* Intel 28F64P30T   (  64M)            */
#define FLASH_28F64P30B		0x00BA	/* Intel 28F64P30B   (  64M)            */
#define FLASH_28F128P30T	0x00BB	/* Intel 28F128P30T  ( 128M = 8M x 16 ) */
#define FLASH_28F128P30B	0x00BC	/* Intel 28F128P30B  ( 128M = 8M x 16 ) */
#define FLASH_28F256P30T	0x00BD	/* Intel 28F256P30T  ( 256M = 16M x 16 )        */
#define FLASH_28F256P30B	0x00BE	/* Intel 28F256P30B  ( 256M = 16M x 16 )        */

#define SYNC			__asm__("nop")

/*-----------------------------------------------------------------------
 * Functions
 */

ulong flash_get_size(FPWV * addr, flash_info_t * info);
int flash_get_offsets(ulong base, flash_info_t * info);
int flash_cmd_rd(volatile u16 * addr, int index);
int write_data(flash_info_t * info, ulong dest, FPW data);
int write_data_block(flash_info_t * info, ulong src, ulong dest);
int write_word_atm(flash_info_t * info, volatile u8 * dest, u16 data);
void inline spin_wheel(void);
void flash_sync_real_protect(flash_info_t * info);
uchar intel_sector_protected(flash_info_t * info, ushort sector);

flash_info_t flash_info[CFG_MAX_FLASH_BANKS];

ulong flash_init(void)
{
	int i;
	ulong size = 0;
	ulong fbase = 0;

	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
		memset(&flash_info[i], 0, sizeof(flash_info_t));

		switch (i) {
		case 0:
			fbase = (ulong) CFG_FLASH0_BASE;
			break;
		case 1:
			fbase = (ulong) CFG_FLASH1_BASE;
			break;
		}

		flash_get_size((FPWV *) fbase, &flash_info[i]);
		flash_get_offsets((ulong) fbase, &flash_info[i]);
		fbase += flash_info[i].size;
		size += flash_info[i].size;

		/* get the h/w and s/w protection status in sync */
		flash_sync_real_protect(&flash_info[i]);
	}

	/* Protect monitor and environment sectors */
	flash_protect(FLAG_PROTECT_SET,
		      CFG_MONITOR_BASE,
		      CFG_MONITOR_BASE + monitor_flash_len - 1, &flash_info[0]);

	return size;
}

int flash_get_offsets(ulong base, flash_info_t * info)
{
	int i, j, k;
	int sectors, bs, banks;
	ulong start;

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_ATM) {
		int sect[] = CFG_ATMEL_SECT;
		int sectsz[] = CFG_ATMEL_SECTSZ;

		info->start[0] = base;
		for (k = 0, i = 0; i < CFG_ATMEL_REGION; i++) {
			for (j = 0; j < sect[i]; j++, k++) {
				info->start[k + 1] = info->start[k] + sectsz[i];
				info->protect[k] = 0;
			}
		}
	}

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
		volatile u16 *addr16 = (volatile u16 *)base;

		*addr16 = (FPW) INTEL_RESET;	/* restore read mode */
		*addr16 = (FPW) INTEL_READID;

		banks = addr16[INTEL_CFI_BANK] & 0xff;

		sectors = 0;
		info->start[0] = base;

		for (k = 0, i = 0; i < banks; i++) {
			/* Geometry y1 = y1 + 1, y2 = y2 + 1, CFI spec.
			 * To be exact, Z = [0x2f 0x30] (LE) * 256 bytes * [0x2D 0x2E] block count
			 * Z = [0x33 0x34] (LE) * 256 bytes * [0x31 0x32] block count
			 */
			bs = ((((addr16[INTEL_CFI_SZ1B + (i * 4)] & 0xff) << 8)
			       | (addr16[INTEL_CFI_SZ1A + (i * 4)] & 0xff)) *
			      0x100);
			sectors =
			    (addr16[INTEL_CFI_BLK1A + (i * 4)] & 0xff) + 1;

			for (j = 0; j < sectors; j++, k++) {
				info->start[k + 1] = info->start[k] + bs;
			}
		}

		*addr16 = (FPW) INTEL_RESET;	/* restore read mode */
	}

	return ERR_OK;
}

void flash_print_info(flash_info_t * info)
{
	int i;

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_INTEL:
		printf("INTEL ");
		break;
	case FLASH_MAN_ATM:
		printf("ATMEL ");
		break;
	default:
		printf("Unknown Vendor ");
		break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AT040:
		printf("AT49BV040A\n");
		break;
	case FLASH_28F128J3A:
		printf("Intel 28F128J3A\n");
		break;
	default:
		printf("Unknown Chip Type\n");
		return;
	}

	if (info->size > 0x100000) {
		int remainder;

		printf("  Size: %ld", info->size >> 20);

		remainder = (info->size % 0x100000);
		if (remainder) {
			remainder >>= 10;
			remainder = (int)((float)
					  (((float)remainder / (float)1024) *
					   10000));
			printf(".%d ", remainder);
		}

		printf("MB in %d Sectors\n", info->sector_count);
	} else
		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");
}

/*
 * The following code cannot be run from FLASH!
 */
ulong flash_get_size(FPWV * addr, flash_info_t * info)
{
	volatile u16 *addr16 = (volatile u16 *)addr;
	int intel = 0, banks = 0;
	u16 value;
	int i;

	addr[FLASH_CYCLE1] = (FPWV) 0x00AA00AA;	/* for Atmel, Intel ignores this */
	addr[FLASH_CYCLE2] = (FPWV) 0x00550055;	/* for Atmel, Intel ignores this */
	addr[FLASH_CYCLE1] = (FPWV) 0x00900090;	/* selects Intel or Atmel */

	switch (addr[0] & 0xff) {
	case (u8) ATM_MANUFACT:
		info->flash_id = FLASH_MAN_ATM;
		value = addr[1];
		break;
	case (u8) INTEL_MANUFACT:
		/* Terminate Atmel ID read */
		addr[0] = (FPWV) 0x00F000F0;
		/* Write auto select command: read Manufacturer ID */
		/* Write auto select command sequence and test FLASH answer */
		*addr16 = (FPW) INTEL_RESET;	/* restore read mode */
		*addr16 = (FPW) INTEL_READID;

		info->flash_id = FLASH_MAN_INTEL;
		value = (addr16[INTEL_CFI_MFG] << 8);
		value |= addr16[INTEL_CFI_PART] & 0xff;
		intel = 1;
		break;
	default:
		printf("Unknown Flash\n");
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;

		*addr = (FPW) 0x00F000F0;
		*addr = (FPW) INTEL_RESET;	/* restore read mode */
		return (0);	/* no or unknown flash  */
	}

	switch (value) {
	case (u8) ATM_ID_LV040:
		info->flash_id += FLASH_AT040;
		break;
	case (u16) INTEL_ID_28F128J3:
		info->flash_id += FLASH_28F128J3A;
		break;
	case (u16) INTEL_ID_28F64P30T:
		info->flash_id += FLASH_28F64P30T;
		break;
	case (u16) INTEL_ID_28F64P30B:
		info->flash_id += FLASH_28F64P30B;
		break;
	case (u16) INTEL_ID_28F128P30T:
		info->flash_id += FLASH_28F128P30T;
		break;
	case (u16) INTEL_ID_28F128P30B:
		info->flash_id += FLASH_28F128P30B;
		break;
	case (u16) INTEL_ID_28F256P30T:
		info->flash_id += FLASH_28F256P30T;
		break;
	case (u16) INTEL_ID_28F256P30B:
		info->flash_id += FLASH_28F256P30B;
		break;
	default:
		info->flash_id = FLASH_UNKNOWN;
		break;
	}

	if (intel) {
		/* Intel spec. under CFI section */
		u32 sz;
		int sectors, bs;

		banks = addr16[INTEL_CFI_BANK] & 0xff;

		sectors = sz = 0;
		for (i = 0; i < banks; i++) {
			/* Geometry y1 = y1 + 1, y2 = y2 + 1, CFI spec.
			 * To be exact, Z = [0x2f 0x30] (LE) * 256 bytes * [0x2D 0x2E] block count
			 * Z = [0x33 0x34] (LE) * 256 bytes * [0x31 0x32] block count
			 */
			bs = ((((addr16[INTEL_CFI_SZ1B + (i * 4)] & 0xff) << 8)
			       | (addr16[INTEL_CFI_SZ1A + (i * 4)] & 0xff)) *
			      0x100);
			sectors +=
			    (addr16[INTEL_CFI_BLK1A + (i * 4)] & 0xff) + 1;
			sz += (bs * sectors);
		}

		info->sector_count = sectors;
		info->size = sz;
		*addr = (FPW) INTEL_RESET;	/* restore read mode */
	} else {
		int sect[] = CFG_ATMEL_SECT;
		int sectsz[] = CFG_ATMEL_SECTSZ;

		info->sector_count = 0;
		info->size = 0;
		for (i = 0; i < CFG_ATMEL_REGION; i++) {
			info->sector_count += sect[i];
			info->size += sect[i] * sectsz[i];
		}

		/* reset ID mode */
		addr[0] = (FPWV) 0x00F000F0;
	}

	if (info->sector_count > CFG_MAX_FLASH_SECT) {
		printf("** ERROR: sector count %d > max (%d) **\n",
		       info->sector_count, CFG_MAX_FLASH_SECT);
		info->sector_count = CFG_MAX_FLASH_SECT;
	}

	return (info->size);
}

int flash_cmd_rd(volatile u16 * addr, int index)
{
	return (int)addr[index];
}

/*
 * This function gets the u-boot flash sector protection status
 * (flash_info_t.protect[]) in sync with the sector protection
 * status stored in hardware.
 */
void flash_sync_real_protect(flash_info_t * info)
{
	int i;

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F160C3B:
	case FLASH_28F160C3T:
	case FLASH_28F320C3B:
	case FLASH_28F320C3T:
	case FLASH_28F640C3B:
	case FLASH_28F640C3T:
		for (i = 0; i < info->sector_count; ++i) {
			info->protect[i] = intel_sector_protected(info, i);
		}
		break;
	default:
		/* no h/w protect support */
		break;
	}
}

/*
 * checks if "sector" in bank "info" is protected. Should work on intel
 * strata flash chips 28FxxxJ3x in 8-bit mode.
 * Returns 1 if sector is protected (or timed-out while trying to read
 * protection status), 0 if it is not.
 */
uchar intel_sector_protected(flash_info_t * info, ushort sector)
{
	FPWV *addr;
	FPWV *lock_conf_addr;
	ulong start;
	unsigned char ret;

	/*
	 * first, wait for the WSM to be finished. The rationale for
	 * waiting for the WSM to become idle for at most
	 * CFG_FLASH_ERASE_TOUT is as follows. The WSM can be busy
	 * because of: (1) erase, (2) program or (3) lock bit
	 * configuration. So we just wait for the longest timeout of
	 * the (1)-(3), i.e. the erase timeout.
	 */

	/* wait at least 35ns (W12) before issuing Read Status Register */
	/*udelay(1); */
	addr = (FPWV *) info->start[sector];
	*addr = (FPW) INTEL_STATUS;

	start = get_timer(0);
	while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
		if (get_timer(start) > CFG_FLASH_UNLOCK_TOUT) {
			*addr = (FPW) INTEL_RESET;	/* restore read mode */
			printf("WSM busy too long, can't get prot status\n");
			return 1;
		}
	}

	/* issue the Read Identifier Codes command */
	*addr = (FPW) INTEL_READID;

	/* Intel example code uses offset of 4 for 8-bit flash */
	lock_conf_addr = (FPWV *) info->start[sector];
	ret = (lock_conf_addr[INTEL_CFI_LOCK] & (FPW) INTEL_PROTECT) ? 1 : 0;

	/* put flash back in read mode */
	*addr = (FPW) INTEL_RESET;

	return ret;
}

int flash_erase(flash_info_t * info, int s_first, int s_last)
{
	int flag, prot, sect;
	ulong type, start, last;
	int rcode = 0, intel = 0;

	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;
	}

	type = (info->flash_id & FLASH_VENDMASK);

	if (type != (FLASH_MAN_INTEL & FLASH_VENDMASK)) {
		if (type != (FLASH_MAN_ATM & FLASH_VENDMASK)) {
			type = (info->flash_id & FLASH_VENDMASK);
			printf
			    ("Can't erase unknown flash type %08lx - aborted\n",
			     info->flash_id);
			return 1;
		}
	}

	if (type == FLASH_MAN_INTEL)
		intel = 1;