/* * (C) Copyright 2002 * Brad Kemp, Seranoa Networks, Brad.Kemp@seranoa.com * * 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/processor.h>#include <asm/cache.h>#undef  DEBUG_FLASH/* * This file implements a Common Flash Interface (CFI) driver for U-Boot. * The width of the port and the width of the chips are determined at initialization. * These widths are used to calculate the address for access CFI data structures. * It has been tested on an Intel Strataflash implementation. * * References * JEDEC Standard JESD68 - Common Flash Interface (CFI) * JEDEC Standard JEP137-A Common Flash Interface (CFI) ID Codes * Intel Application Note 646 Common Flash Interface (CFI) and Command Sets * Intel 290667-008 3 Volt Intel StrataFlash Memory datasheet * * TODO * Use Primary Extended Query table (PRI) and Alternate Algorithm Query Table (ALT) to determine if protection is available * Add support for other command sets Use the PRI and ALT to determine command set * Verify erase and program timeouts. */#define FLASH_CMD_CFI			0x98#define FLASH_CMD_READ_ID		0x90#define FLASH_CMD_RESET			0xff#define FLASH_CMD_BLOCK_ERASE		0x20#define FLASH_CMD_ERASE_CONFIRM		0xD0#define FLASH_CMD_WRITE			0x40#define FLASH_CMD_PROTECT		0x60#define FLASH_CMD_PROTECT_SET		0x01#define FLASH_CMD_PROTECT_CLEAR		0xD0#define FLASH_CMD_CLEAR_STATUS		0x50#define FLASH_CMD_WRITE_TO_BUFFER       0xE8#define FLASH_CMD_WRITE_BUFFER_CONFIRM  0xD0#define FLASH_STATUS_DONE		0x80#define FLASH_STATUS_ESS		0x40#define FLASH_STATUS_ECLBS		0x20#define FLASH_STATUS_PSLBS		0x10#define FLASH_STATUS_VPENS		0x08#define FLASH_STATUS_PSS		0x04#define FLASH_STATUS_DPS		0x02#define FLASH_STATUS_R			0x01#define FLASH_STATUS_PROTECT		0x01#define FLASH_OFFSET_CFI		0x55#define FLASH_OFFSET_CFI_RESP		0x10#define FLASH_OFFSET_WTOUT		0x1F#define FLASH_OFFSET_WBTOUT             0x20#define FLASH_OFFSET_ETOUT		0x21#define FLASH_OFFSET_CETOUT             0x22#define FLASH_OFFSET_WMAX_TOUT		0x23#define FLASH_OFFSET_WBMAX_TOUT         0x24#define FLASH_OFFSET_EMAX_TOUT		0x25#define FLASH_OFFSET_CEMAX_TOUT         0x26#define FLASH_OFFSET_SIZE		0x27#define FLASH_OFFSET_INTERFACE          0x28#define FLASH_OFFSET_BUFFER_SIZE        0x2A#define FLASH_OFFSET_NUM_ERASE_REGIONS	0x2C#define FLASH_OFFSET_ERASE_REGIONS	0x2D#define FLASH_OFFSET_PROTECT		0x02#define FLASH_OFFSET_USER_PROTECTION    0x85#define FLASH_OFFSET_INTEL_PROTECTION   0x81#define FLASH_MAN_CFI			0x01000000typedef union {	unsigned char c;	unsigned short w;	unsigned long l;} cfiword_t;typedef union {	unsigned char *cp;	unsigned short *wp;	unsigned long *lp;} cfiptr_t;#define NUM_ERASE_REGIONS 4flash_info_t flash_info[CFG_MAX_FLASH_BANKS];	/* info for FLASH chips        *//*----------------------------------------------------------------------- * Functions */static void flash_add_byte(flash_info_t * info, cfiword_t * cword, uchar c);static void flash_make_cmd(flash_info_t * info, uchar cmd, void *cmdbuf);static void flash_write_cmd(flash_info_t * info, int sect, uchar offset,			    uchar cmd);static int flash_isequal(flash_info_t * info, int sect, uchar offset,			 uchar cmd);static int flash_isset(flash_info_t * info, int sect, uchar offset, uchar cmd);static int flash_detect_cfi(flash_info_t * info);static ulong flash_get_size(ulong base, int banknum);static int flash_write_cfiword(flash_info_t * info, ulong dest,			       cfiword_t cword);static int flash_full_status_check(flash_info_t * info, ulong sector,				   ulong tout, char *prompt);#ifdef CFG_FLASH_USE_BUFFER_WRITEstatic int flash_write_cfibuffer(flash_info_t * info, ulong dest, uchar * cp,				 int len);#endif/*----------------------------------------------------------------------- * create an address based on the offset and the port width */inline uchar *flash_make_addr(flash_info_t * info, int sect, int offset){	return ((uchar *) (info->start[sect] + (offset * info->portwidth)));}/*----------------------------------------------------------------------- * read a character at a port width address */inline uchar flash_read_uchar(flash_info_t * info, uchar offset){	uchar *cp;	cp = flash_make_addr(info, 0, offset);	return (cp[info->portwidth - 1]);}/*----------------------------------------------------------------------- * read a short word by swapping for ppc format. */ushort flash_read_ushort(flash_info_t * info, int sect, uchar offset){	uchar *addr;	addr = flash_make_addr(info, sect, offset);	return ((addr[(2 * info->portwidth) - 1] << 8) |		addr[info->portwidth - 1]);}/*----------------------------------------------------------------------- * read a long word by picking the least significant byte of each maiximum * port size word. Swap for ppc format. */ulong flash_read_long(flash_info_t * info, int sect, uchar offset){	uchar *addr;	addr = flash_make_addr(info, sect, offset);	return ((addr[(2 * info->portwidth) - 1] << 24) |		(addr[(info->portwidth) - 1] << 16) |		(addr[(4 * info->portwidth) - 1] << 8) |		addr[(3 * info->portwidth) - 1]);}/*----------------------------------------------------------------------- */unsigned long flash_init(void){	unsigned long size;	int i;	unsigned long address;	/* The flash is positioned back to back, with the demultiplexing of the chip	 * based on the A24 address line.	 *	 */	address = CFG_FLASH_BASE;	size = 0;	/* Init: no FLASHes known */	for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) {		flash_info[i].flash_id = FLASH_UNKNOWN;		size += flash_info[i].size = flash_get_size(address, i);		address += CFG_FLASH_INCREMENT;		if (flash_info[i].flash_id == FLASH_UNKNOWN) {			printf			    ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",			     i, flash_info[0].size, flash_info[i].size << 20);		}	}#if 0				/* test-only */	/* Monitor protection ON by default */#if (CFG_MONITOR_BASE >= CFG_FLASH_BASE)	for (i = 0;	     flash_info[0].start[i] < CFG_MONITOR_BASE + monitor_flash_len - 1;	     i++)		(void)flash_real_protect(&flash_info[0], i, 1);#endif#endif	return (size);}/*----------------------------------------------------------------------- */int flash_erase(flash_info_t * info, int s_first, int s_last){	int rcode = 0;	int prot;	int sect;	if (info->flash_id != FLASH_MAN_CFI) {		printf("Can't erase unknown flash type - aborted\n");		return 1;	}	if ((s_first < 0) || (s_first > s_last)) {		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");	}	for (sect = s_first; sect <= s_last; sect++) {		if (info->protect[sect] == 0) {	/* not protected */			flash_write_cmd(info, sect, 0, FLASH_CMD_CLEAR_STATUS);			flash_write_cmd(info, sect, 0, FLASH_CMD_BLOCK_ERASE);			flash_write_cmd(info, sect, 0, FLASH_CMD_ERASE_CONFIRM);			if (flash_full_status_check			    (info, sect, info->erase_blk_tout, "erase")) {				rcode = 1;			} else				printf(".");		}	}	printf(" done\n");	return rcode;}/*----------------------------------------------------------------------- */void flash_print_info(flash_info_t * info){	int i;	if (info->flash_id != FLASH_MAN_CFI) {		printf("missing or unknown FLASH type\n");		return;	}	printf("CFI conformant FLASH (%d x %d)",	       (info->portwidth << 3), (info->chipwidth << 3));	printf("  Size: %ld MB in %d Sectors\n",	       info->size >> 20, info->sector_count);	printf	    (" Erase timeout %ld ms, write timeout %ld ms, buffer write timeout %ld ms, buffer size %d\n",	     info->erase_blk_tout, info->write_tout, info->buffer_write_tout,	     info->buffer_size);	printf("  Sector Start Addresses:");	for (i = 0; i < info->sector_count; ++i) {		if ((i % 5) == 0)			printf("\n");		printf(" %08lX%5s",		       info->start[i], info->protect[i] ? " (RO)" : " ");	}	printf("\n");	return;}/*----------------------------------------------------------------------- * 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){	ulong wp;	ulong cp;	int aln;	cfiword_t cword;	int i, rc;	/* get lower aligned address */	wp = (addr & ~(info->portwidth - 1));	/* handle unaligned start */	if ((aln = addr - wp) != 0) {		cword.l = 0;		cp = wp;		for (i = 0; i < aln; ++i, ++cp)			flash_add_byte(info, &cword, (*(uchar *) cp));		for (; (i < info->portwidth) && (cnt > 0); i++) {			flash_add_byte(info, &cword, *src++);			cnt--;			cp++;		}		for (; (cnt == 0) && (i < info->portwidth); ++i, ++cp)			flash_add_byte(info, &cword, (*(uchar *) cp));		if ((rc = flash_write_cfiword(info, wp, cword)) != 0)			return rc;		wp = cp;	}#ifdef CFG_FLASH_USE_BUFFER_WRITE	while (cnt >= info->portwidth) {		i = info->buffer_size > cnt ? cnt : info->buffer_size;		if ((rc = flash_write_cfibuffer(info, wp, src, i)) != ERR_OK)			return rc;		wp += i;		src += i;		cnt -= i;	}#else	/* handle the aligned part */	while (cnt >= info->portwidth) {		cword.l = 0;		for (i = 0; i < info->portwidth; i++) {			flash_add_byte(info, &cword, *src++);		}		if ((rc = flash_write_cfiword(info, wp, cword)) != 0)			return rc;		wp += info->portwidth;		cnt -= info->portwidth;	}#endif				/* CFG_FLASH_USE_BUFFER_WRITE */	if (cnt == 0) {		return (0);	}	/*	 * handle unaligned tail bytes	 */	cword.l = 0;	for (i = 0, cp = wp; (i < info->portwidth) && (cnt > 0); ++i, ++cp) {		flash_add_byte(info, &cword, *src++);		--cnt;	}	for (; i < info->portwidth; ++i, ++cp) {		flash_add_byte(info, &cword, (*(uchar *) cp));	}	return flash_write_cfiword(info, wp, cword);}/*----------------------------------------------------------------------- */int flash_real_protect(flash_info_t * info, long sector, int prot){	int retcode = 0;	flash_write_cmd(info, sector, 0, FLASH_CMD_CLEAR_STATUS);	flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT);	if (prot)		flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_SET);	else		flash_write_cmd(info, sector, 0, FLASH_CMD_PROTECT_CLEAR);	if ((retcode =	     flash_full_status_check(info, sector, info->erase_blk_tout,				     prot ? "protect" : "unprotect")) == 0) {		info->protect[sector] = prot;		/* Intel's unprotect unprotects all locking */		if (prot == 0) {			int i;			for (i = 0; i < info->sector_count; i++) {				if (info->protect[i])					flash_real_protect(info, i, 1);			}		}	}	return retcode;}/*----------------------------------------------------------------------- *  wait for XSR.7 to be set. Time out with an error if it does not. *  This routine does not set the flash to read-array mode.