cfi_flash.c

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/*
 * (C) Copyright 2002-2004
 * Brad Kemp, Seranoa Networks, [e-mail]
 *
 * Copyright (C) 2003 Arabella Software Ltd.
 * Yuli Barcohen <[e-mail]>
 * Modified to work with AMD flashes
 *
 * Copyright (C) 2004
 * Ed Okerson
 * Modified to work with little-endian systems.
 *
 * 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
 *
 * History
 * 01/20/2004 - combined variants of original driver.
 * 01/22/2004 - Write performance enhancements for parallel chips (Tolunay)
 * 01/23/2004 - Support for x8/x16 chips (Rune Raknerud)
 * 01/27/2004 - Little endian support Ed Okerson
 *
 * Tested Architectures
 * Port Width  Chip Width    # of banks	   Flash Chip  Board
 * 32	       16	     1		   28F128J3    seranoa/eagle
 * 64	       16	     1		   28F128J3    seranoa/falcon
 *
 */

/* The DEBUG define must be before common to enable debugging */
/* #define DEBUG	*/

#include <common.h>
#include <asm/processor.h>
#include <asm/byteorder.h>
#include <linux/byteorder/swab.h>
#ifdef	CFG_FLASH_CFI_DRIVER

/*
 * 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 and AMD 29F016D.
 *
 * 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.
 */

#ifndef CFG_FLASH_BANKS_LIST
#define CFG_FLASH_BANKS_LIST { CFG_FLASH_BASE }
#endif

#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 AMD_CMD_RESET			0xF0
#define AMD_CMD_WRITE			0xA0
#define AMD_CMD_ERASE_START		0x80
#define AMD_CMD_ERASE_SECTOR		0x30
#define AMD_CMD_UNLOCK_START		0xAA
#define AMD_CMD_UNLOCK_ACK		0x55

#define AMD_STATUS_TOGGLE		0x40
#define AMD_STATUS_ERROR		0x20
#define AMD_ADDR_ERASE_START		0x555
#define AMD_ADDR_START			0x555
#define AMD_ADDR_ACK			0x2AA

#define FLASH_OFFSET_CFI		0x55
#define FLASH_OFFSET_CFI_RESP		0x10
#define FLASH_OFFSET_PRIMARY_VENDOR	0x13
#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			0x01000000

#define CFI_CMDSET_NONE		    0
#define CFI_CMDSET_INTEL_EXTENDED   1
#define CFI_CMDSET_AMD_STANDARD	    2
#define CFI_CMDSET_INTEL_STANDARD   3
#define CFI_CMDSET_AMD_EXTENDED	    4
#define CFI_CMDSET_MITSU_STANDARD   256
#define CFI_CMDSET_MITSU_EXTENDED   257
#define CFI_CMDSET_SST		    258


#ifdef CFG_FLASH_CFI_AMD_RESET /* needed for STM_ID_29W320DB on UC100 */
# undef  FLASH_CMD_RESET
# define FLASH_CMD_RESET                AMD_CMD_RESET /* use AMD-Reset instead */
#endif


typedef union {
	unsigned char c;
	unsigned short w;
	unsigned long l;
	unsigned long long ll;
} cfiword_t;

typedef union {
	volatile unsigned char *cp;
	volatile unsigned short *wp;
	volatile unsigned long *lp;
	volatile unsigned long long *llp;
} cfiptr_t;

#define NUM_ERASE_REGIONS 4

static ulong bank_base[CFG_MAX_FLASH_BANKS] = CFG_FLASH_BANKS_LIST;

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

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

typedef unsigned long flash_sect_t;

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, flash_sect_t sect, uint offset, uchar cmd);
static void flash_unlock_seq (flash_info_t * info, flash_sect_t sect);
static int flash_isequal (flash_info_t * info, flash_sect_t sect, uint offset, uchar cmd);
static int flash_isset (flash_info_t * info, flash_sect_t sect, uint offset, uchar cmd);
static int flash_toggle (flash_info_t * info, flash_sect_t sect, uint 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, flash_sect_t sector,
				    ulong tout, char *prompt);
#ifdef CFG_FLASH_USE_BUFFER_WRITE
static 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, flash_sect_t sect, uint offset)
{
	return ((uchar *) (info->start[sect] + (offset * info->portwidth)));
}

#ifdef DEBUG
/*-----------------------------------------------------------------------
 * Debug support
 */
void print_longlong (char *str, unsigned long long data)
{
	int i;
	char *cp;

	cp = (unsigned char *) &data;
	for (i = 0; i < 8; i++)
		sprintf (&str[i * 2], "%2.2x", *cp++);
}
static void flash_printqry (flash_info_t * info, flash_sect_t sect)
{
	cfiptr_t cptr;
	int x, y;

	for (x = 0; x < 0x40; x += 16 / info->portwidth) {
		cptr.cp =
			flash_make_addr (info, sect,
					 x + FLASH_OFFSET_CFI_RESP);
		debug ("%p : ", cptr.cp);
		for (y = 0; y < 16; y++) {
			debug ("%2.2x ", cptr.cp[y]);
		}
		debug (" ");
		for (y = 0; y < 16; y++) {
			if (cptr.cp[y] >= 0x20 && cptr.cp[y] <= 0x7e) {
				debug ("%c", cptr.cp[y]);
			} else {
				debug (".");
			}
		}
		debug ("\n");
	}
}
#endif


/*-----------------------------------------------------------------------
 * read a character at a port width address
 */
inline uchar flash_read_uchar (flash_info_t * info, uint offset)
{
	uchar *cp;

	cp = flash_make_addr (info, 0, offset);
#if defined(__LITTLE_ENDIAN)
	return (cp[0]);
#else
	return (cp[info->portwidth - 1]);
#endif
}

/*-----------------------------------------------------------------------
 * read a short word by swapping for ppc format.
 */
ushort flash_read_ushort (flash_info_t * info, flash_sect_t sect, uint offset)
{
	uchar *addr;
	ushort retval;

#ifdef DEBUG
	int x;
#endif
	addr = flash_make_addr (info, sect, offset);

#ifdef DEBUG
	debug ("ushort addr is at %p info->portwidth = %d\n", addr,
	       info->portwidth);
	for (x = 0; x < 2 * info->portwidth; x++) {
		debug ("addr[%x] = 0x%x\n", x, addr[x]);
	}
#endif
#if defined(__LITTLE_ENDIAN)
	retval = ((addr[(info->portwidth)] << 8) | addr[0]);
#else
	retval = ((addr[(2 * info->portwidth) - 1] << 8) |
		  addr[info->portwidth - 1]);
#endif

	debug ("retval = 0x%x\n", retval);
	return retval;
}

/*-----------------------------------------------------------------------
 * 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, flash_sect_t sect, uint offset)
{
	uchar *addr;
	ulong retval;

#ifdef DEBUG
	int x;
#endif
	addr = flash_make_addr (info, sect, offset);

#ifdef DEBUG
	debug ("long addr is at %p info->portwidth = %d\n", addr,
	       info->portwidth);
	for (x = 0; x < 4 * info->portwidth; x++) {
		debug ("addr[%x] = 0x%x\n", x, addr[x]);
	}
#endif
#if defined(__LITTLE_ENDIAN)
	retval = (addr[0] << 16) | (addr[(info->portwidth)] << 24) |
		(addr[(2 * info->portwidth)]) | (addr[(3 * info->portwidth)] << 8);
#else
	retval = (addr[(2 * info->portwidth) - 1] << 24) |
		(addr[(info->portwidth) - 1] << 16) |
		(addr[(4 * info->portwidth) - 1] << 8) |
		addr[(3 * info->portwidth) - 1];
#endif
	return retval;
}

/*-----------------------------------------------------------------------
 */
unsigned long flash_init (void)
{
	unsigned long size = 0;
	int i;

	/* 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 (bank_base[i], i);
		if (flash_info[i].flash_id == FLASH_UNKNOWN) {
			printf ("## Unknown FLASH on Bank %d - Size = 0x%08lx = %ld MB\n",
				i, flash_info[i].size, flash_info[i].size << 20);
		}
	}

	/* Monitor protection ON by default */
#if (CFG_MONITOR_BASE >= CFG_FLASH_BASE)
	flash_protect (FLAG_PROTECT_SET,
		       CFG_MONITOR_BASE,
		       CFG_MONITOR_BASE + CFG_MONITOR_LEN - 1,
		       &flash_info[0]);
#endif

	/* Environment protection ON by default */
#ifdef CFG_ENV_IS_IN_FLASH
	flash_protect (FLAG_PROTECT_SET,
		       CFG_ENV_ADDR,
		       CFG_ENV_ADDR + CFG_ENV_SECT_SIZE - 1,
		       &flash_info[0]);
#endif

	/* Redundant environment protection ON by default */
#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);
}

/*-----------------------------------------------------------------------
 */
int flash_erase (flash_info_t * info, int s_first, int s_last)
{
	int rcode = 0;
	int prot;
	flash_sect_t sect;

	if (info->flash_id != FLASH_MAN_CFI) {
		puts ("Can't erase unknown flash type - aborted\n");
		return 1;
	}
	if ((s_first < 0) || (s_first > s_last)) {
		puts ("- 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 {
		putc ('\n');
	}


	for (sect = s_first; sect <= s_last; sect++) {
		if (info->protect[sect] == 0) { /* not protected */
			switch (info->vendor) {
			case CFI_CMDSET_INTEL_STANDARD:
			case CFI_CMDSET_INTEL_EXTENDED:
				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);
				break;
			case CFI_CMDSET_AMD_STANDARD:
			case CFI_CMDSET_AMD_EXTENDED:
				flash_unlock_seq (info, sect);
				flash_write_cmd (info, sect, AMD_ADDR_ERASE_START,
							AMD_CMD_ERASE_START);
				flash_unlock_seq (info, sect);
				flash_write_cmd (info, sect, 0, AMD_CMD_ERASE_SECTOR);
				break;
			default:
				debug ("Unkown flash vendor %d\n",
				       info->vendor);
				break;
			}

			if (flash_full_status_check
			    (info, sect, info->erase_blk_tout, "erase")) {
				rcode = 1;