flash.c

u-boot-1.1.6 源码包

/*
 * (C) Copyright 2001
 * Kyle Harris, Nexus Technologies, Inc. [e-mail]
 *
 * (C) Copyright 2001-2004
 * Wolfgang Denk, DENX Software Engineering, [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 <linux/byteorder/swab.h>


flash_info_t flash_info[CFG_MAX_FLASH_BANKS];	/* info for FLASH chips    */

/* Board support for 1 or 2 flash devices */
#define FLASH_PORT_WIDTH32
#undef FLASH_PORT_WIDTH16

#ifdef FLASH_PORT_WIDTH16
#define FLASH_PORT_WIDTH		ushort
#define FLASH_PORT_WIDTHV		vu_short
#define SWAP(x)               		(x)
#else
#define FLASH_PORT_WIDTH		ulong
#define FLASH_PORT_WIDTHV		vu_long
#define SWAP(x)               		(x)
#endif

/* Intel-compatible flash ID */
#define INTEL_COMPAT  0x00890089
#define INTEL_ALT     0x00B000B0

/* Intel-compatible flash commands */
#define INTEL_PROGRAM 0x00100010
#define INTEL_ERASE   0x00200020
#define INTEL_CLEAR   0x00500050
#define INTEL_LOCKBIT 0x00600060
#define INTEL_PROTECT 0x00010001
#define INTEL_STATUS  0x00700070
#define INTEL_READID  0x00900090
#define INTEL_CONFIRM 0x00D000D0
#define INTEL_RESET   0xFFFFFFFF

/* Intel-compatible flash status bits */
#define INTEL_FINISHED 0x00800080
#define INTEL_OK       0x00800080

#define FPW	   FLASH_PORT_WIDTH
#define FPWV   FLASH_PORT_WIDTHV

#define mb() __asm__ __volatile__ ("" : : : "memory")

/*-----------------------------------------------------------------------
 * Functions
 */
static ulong flash_get_size (FPW *addr, flash_info_t *info);
static int write_data (flash_info_t *info, ulong dest, FPW data);
static void flash_get_offsets (ulong base, flash_info_t *info);
void inline spin_wheel (void);
static void flash_sync_real_protect (flash_info_t * info);
static unsigned char intel_sector_protected (flash_info_t *info, ushort sector);

/*-----------------------------------------------------------------------
 */

unsigned long flash_init (void)
{
	int i;
	ulong size = 0;
	extern void flash_preinit(void);
	extern void flash_afterinit(ulong, ulong);
	ulong flashbase = CFG_FLASH_BASE;

	flash_preinit();

	for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
		switch (i) {
		case 0:
			memset(&flash_info[i], 0, sizeof(flash_info_t));
			flash_get_size ((FPW *) flashbase, &flash_info[i]);
			flash_get_offsets (flash_info[i].start[0], &flash_info[i]);
			break;
		default:
			panic ("configured to many flash banks!\n");
			break;
		}
		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
	 */
#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
#ifndef CONFIG_BOOT_ROM
	flash_protect ( FLAG_PROTECT_SET,
			CFG_MONITOR_BASE,
			CFG_MONITOR_BASE + monitor_flash_len - 1,
			&flash_info[0] );
#endif
#endif

#ifdef	CFG_ENV_IS_IN_FLASH
	flash_protect ( FLAG_PROTECT_SET,
			CFG_ENV_ADDR,
			CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0] );
#endif

	flash_afterinit(flash_info[0].start[0], flash_info[0].size);

	return size;
}

/*-----------------------------------------------------------------------
 */
static void flash_get_offsets (ulong base, flash_info_t *info)
{
	int i;

	if (info->flash_id == FLASH_UNKNOWN) {
		return;
	}

	if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
		for (i = 0; i < info->sector_count; i++) {
			info->start[i] = base + (i * PHYS_FLASH_SECT_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_INTEL:
		printf ("INTEL ");
		break;
	default:
		printf ("Unknown Vendor ");
		break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_28F256J3A:
		printf ("28F256J3A\n");
		break;

	case FLASH_28F128J3A:
		printf ("28F128J3A\n");
		break;

	case FLASH_28F640J3A:
		printf ("28F640J3A\n");
		break;

	case FLASH_28F320J3A:
		printf ("28F320J3A\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");
	return;
}

/*
 * The following code cannot be run from FLASH!
 */
static ulong flash_get_size (FPW *addr, flash_info_t *info)
{
	volatile FPW value;

	/* Write auto select command: read Manufacturer ID */
	addr[0x5555] = (FPW) 0x00AA00AA;
	addr[0x2AAA] = (FPW) 0x00550055;
	addr[0x5555] = (FPW) 0x00900090;

	mb ();
	udelay(100);

	value = addr[0];

	switch (value) {

	case (FPW) INTEL_MANUFACT:
		info->flash_id = FLASH_MAN_INTEL;
		break;

	default:
		info->flash_id = FLASH_UNKNOWN;
		info->sector_count = 0;
		info->size = 0;
		addr[0] = (FPW) 0x00FF00FF;	/* restore read mode */
		return (0);			/* no or unknown flash  */
	}

	mb ();
	value = addr[1];			/* device ID        */

	switch (value) {

	case (FPW) INTEL_ID_28F256J3A:
		info->flash_id += FLASH_28F256J3A;
		/* In U-Boot we support only 32 MB (no bank-switching) */
		info->sector_count = 256 / 2;
		info->size =  0x04000000 / 2;
		info->start[0] = CFG_FLASH_BASE + 0x02000000;
		break;				/* => 32 MB     */

	case (FPW) INTEL_ID_28F128J3A:
		info->flash_id += FLASH_28F128J3A;
		info->sector_count = 128;
		info->size = 0x02000000;
		info->start[0] = CFG_FLASH_BASE + 0x02000000;
		break;				/* => 32 MB     */

	case (FPW) INTEL_ID_28F640J3A:
		info->flash_id += FLASH_28F640J3A;
		info->sector_count = 64;
		info->size = 0x01000000;
		info->start[0] = CFG_FLASH_BASE + 0x03000000;
		break;				/* => 16 MB     */

	case (FPW) INTEL_ID_28F320J3A:
		info->flash_id += FLASH_28F320J3A;
		info->sector_count = 32;
		info->size = 0x800000;
		info->start[0] = CFG_FLASH_BASE + 0x03800000;
		break;				/* => 8 MB     */

	default:
		info->flash_id = FLASH_UNKNOWN;
		break;
	}

	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;
	}

	addr[0] = (FPW) 0x00FF00FF;		/* restore read mode */

	return (info->size);
}


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

	switch (info->flash_id & FLASH_TYPEMASK) {

	case FLASH_28F256J3A:
	case FLASH_28F128J3A:
	case FLASH_28F640J3A:
	case FLASH_28F320J3A:
		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.
 */
static unsigned char 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.
	 */