board/cogent/flash.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2000
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #include <common.h>
 #include "flash.h"
 #include <linux/compiler.h>

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

 #if defined(CONFIG_ENV_IS_IN_FLASH)
 # ifndef  CONFIG_ENV_ADDR
 #  define CONFIG_ENV_ADDR	(CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
 # endif
 # ifndef  CONFIG_ENV_SIZE
 #  define CONFIG_ENV_SIZE	CONFIG_ENV_SECT_SIZE
 # endif
 # ifndef  CONFIG_ENV_SECT_SIZE
 #  define CONFIG_ENV_SECT_SIZE  CONFIG_ENV_SIZE
 # endif
 #endif

 /*-----------------------------------------------------------------------
  * Functions
  */
 static int write_word (flash_info_t *info, ulong dest, ulong data);

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


 #if defined(CONFIG_CMA302)

 /*
  * probe for the existence of flash at address "addr"
  * 0 = yes, 1 = bad Manufacturer's Id, 2 = bad Device Id
  */
 static int
 c302f_probe_word(c302f_addr_t addr)
 {
 	/* reset the flash */
 	*addr = C302F_BNK_CMD_RST;

 	/* check the manufacturer id */
 	*addr = C302F_BNK_CMD_RD_ID;
 	if (*C302F_BNK_ADDR_MAN(addr) != C302F_BNK_RD_ID_MAN)
 		return 1;

 	/* check the device id */
 	*addr = C302F_BNK_CMD_RD_ID;
 	if (*C302F_BNK_ADDR_DEV(addr) != C302F_BNK_RD_ID_DEV)
 		return 2;

 #ifdef FLASH_DEBUG
 	{
 		int i;

 		printf("\nMaster Lock Config = 0x%08lx\n",
 			*C302F_BNK_ADDR_CFGM(addr));
 		for (i = 0; i < C302F_BNK_NBLOCKS; i++)
 			printf("Block %2d Lock Config = 0x%08lx\n",
 				i, *C302F_BNK_ADDR_CFG(i, addr));
 	}
 #endif

 	/* reset the flash again */
 	*addr = C302F_BNK_CMD_RST;

 	return 0;
 }

 /*
  * probe for Cogent CMA302 flash module at address "base" and store
  * info for any found into flash_info entry "fip". Must find at least
  * one bank.
  */
 static void
 c302f_probe(flash_info_t *fip, c302f_addr_t base)
 {
 	c302f_addr_t addr, eaddr;
 	int nbanks;

 	fip->size = 0L;
 	fip->sector_count = 0;

 	addr = base;
 	eaddr = C302F_BNK_ADDR_BASE(addr, C302F_MAX_BANKS);
 	nbanks = 0;

 	while (addr < eaddr) {
 		c302f_addr_t addrw, eaddrw, addrb;
 		int i, osc, nsc;

 		addrw = addr;
 		eaddrw = C302F_BNK_ADDR_NEXT_WORD(addrw);

 		while (addrw < eaddrw)
 			if (c302f_probe_word(addrw++) != 0)
 				goto out;

 		/* bank exists - append info for this bank to *fip */
 		fip->flash_id = FLASH_MAN_INTEL|FLASH_28F008S5;
 		fip->size += C302F_BNK_SIZE;
 		osc = fip->sector_count;
 		fip->sector_count += C302F_BNK_NBLOCKS;
 		if ((nsc = fip->sector_count) >= CONFIG_SYS_MAX_FLASH_SECT)
 			panic("Too many sectors in flash at address 0x%08lx\n",
 				(unsigned long)base);

 		addrb = addr;
 		for (i = osc; i < nsc; i++) {
 			fip->start[i] = (ulong)addrb;
 			fip->protect[i] = 0;
 			addrb = C302F_BNK_ADDR_NEXT_BLK(addrb);
 		}

 		addr = C302F_BNK_ADDR_NEXT_BNK(addr);
 		nbanks++;
 	}

 out:
 	if (nbanks == 0)
 		panic("ERROR: no flash found at address 0x%08lx\n",
 			(unsigned long)base);
 }

 static void
 c302f_reset(flash_info_t *info, int sect)
 {
 	c302f_addr_t addrw, eaddrw;

 	addrw = (c302f_addr_t)info->start[sect];
 	eaddrw = C302F_BNK_ADDR_NEXT_WORD(addrw);

 	while (addrw < eaddrw) {
 #ifdef FLASH_DEBUG
 		printf("  writing reset cmd to addr 0x%08lx\n",
 			(unsigned long)addrw);
 #endif
 		*addrw = C302F_BNK_CMD_RST;
 		addrw++;
 	}
 }

 static void
 c302f_erase_init(flash_info_t *info, int sect)
 {
 	c302f_addr_t addrw, saddrw, eaddrw;
 	int flag;

 #ifdef FLASH_DEBUG
 	printf("0x%08lx C302F_BNK_CMD_PROG\n", C302F_BNK_CMD_PROG);
 	printf("0x%08lx C302F_BNK_CMD_ERASE1\n", C302F_BNK_CMD_ERASE1);
 	printf("0x%08lx C302F_BNK_CMD_ERASE2\n", C302F_BNK_CMD_ERASE2);
 	printf("0x%08lx C302F_BNK_CMD_CLR_STAT\n", C302F_BNK_CMD_CLR_STAT);
 	printf("0x%08lx C302F_BNK_CMD_RST\n", C302F_BNK_CMD_RST);
 	printf("0x%08lx C302F_BNK_STAT_RDY\n", C302F_BNK_STAT_RDY);
 	printf("0x%08lx C302F_BNK_STAT_ERR\n", C302F_BNK_STAT_ERR);
 #endif

 	saddrw = (c302f_addr_t)info->start[sect];
 	eaddrw = C302F_BNK_ADDR_NEXT_WORD(saddrw);

 #ifdef FLASH_DEBUG
 	printf("erasing sector %d, start addr = 0x%08lx "
 		"(bank next word addr = 0x%08lx)\n", sect,
 		(unsigned long)saddrw, (unsigned long)eaddrw);
 #endif

 	/* Disable intrs which might cause a timeout here */
 	flag = disable_interrupts();

 	for (addrw = saddrw; addrw < eaddrw; addrw++) {
 #ifdef FLASH_DEBUG
 		printf("  writing erase cmd to addr 0x%08lx\n",
 			(unsigned long)addrw);
 #endif
 		*addrw = C302F_BNK_CMD_ERASE1;
 		*addrw = C302F_BNK_CMD_ERASE2;
 	}

 	/* re-enable interrupts if necessary */
 	if (flag)
 		enable_interrupts();
 }

 static int
 c302f_erase_poll(flash_info_t *info, int sect)
 {
 	c302f_addr_t addrw, saddrw, eaddrw;
 	int sectdone, haderr;

 	saddrw = (c302f_addr_t)info->start[sect];
 	eaddrw = C302F_BNK_ADDR_NEXT_WORD(saddrw);

 	sectdone = 1;
 	haderr = 0;

 	for (addrw = saddrw; addrw < eaddrw; addrw++) {
 		c302f_word_t stat = *addrw;

 #ifdef FLASH_DEBUG
 		printf("  checking status at addr "
 			"0x%08lx [0x%08lx]\n",
 			(unsigned long)addrw, stat);
 #endif
 		if ((stat & C302F_BNK_STAT_RDY) != C302F_BNK_STAT_RDY)
 			sectdone = 0;
 		else if ((stat & C302F_BNK_STAT_ERR) != 0) {
 			printf(" failed on sector %d "
 				"(stat = 0x%08lx) at "
 				"address 0x%08lx\n",
 				sect, stat,
 				(unsigned long)addrw);
 			*addrw = C302F_BNK_CMD_CLR_STAT;
 			haderr = 1;
 		}
 	}

 	if (haderr)
 		return (-1);
 	else
 		return (sectdone);
 }

 static int
 c302f_write_word(c302f_addr_t addr, c302f_word_t value)
 {
 	c302f_word_t stat;
 	ulong start;
 	int flag, retval;

 	/* Disable interrupts which might cause a timeout here */
 	flag = disable_interrupts();

 	*addr = C302F_BNK_CMD_PROG;

 	*addr = value;

 	/* re-enable interrupts if necessary */
 	if (flag)
 		enable_interrupts();

 	retval = 0;

 	/* data polling for D7 */
 	start = get_timer (0);
 	do {
 		if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
 			retval = 1;
 			goto done;
 		}
 		stat = *addr;
 	} while ((stat & C302F_BNK_STAT_RDY) != C302F_BNK_STAT_RDY);

 	if ((stat & C302F_BNK_STAT_ERR) != 0) {
 		printf("flash program failed (stat = 0x%08lx) "
 			"at address 0x%08lx\n", (ulong)stat, (ulong)addr);
 		*addr = C302F_BNK_CMD_CLR_STAT;
 		retval = 3;
 	}

 done:
 	/* reset to read mode */
 	*addr = C302F_BNK_CMD_RST;

 	return (retval);
 }

 #endif	/* CONFIG_CMA302 */

 unsigned long
 flash_init(void)
 {
 	unsigned long total;
 	int i;
 	__maybe_unused flash_info_t *fip;

 	/* Init: no FLASHes known */
 	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
 		flash_info[i].flash_id = FLASH_UNKNOWN;
 	}

 	fip = &flash_info[0];
 	total = 0L;

 #if defined(CONFIG_CMA302)
 	c302f_probe(fip, (c302f_addr_t)CONFIG_SYS_FLASH_BASE);
 	total += fip->size;
 	fip++;
 #endif

 #if (CMA_MB_CAPS & CMA_MB_CAP_FLASH)
 	/* not yet ...
 	cmbf_probe(fip, (cmbf_addr_t)CMA_MB_FLASH_BASE);
 	total += fip->size;
 	fip++;
 	*/
 #endif

 	/*
 	 * protect monitor and environment sectors
 	 */

 #if CONFIG_SYS_MONITOR_BASE == CONFIG_SYS_FLASH_BASE
 	flash_protect(FLAG_PROTECT_SET,
 		      CONFIG_SYS_MONITOR_BASE,
 		      CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
 		      &flash_info[0]);
 #endif

 #ifdef	CONFIG_ENV_IS_IN_FLASH
 	/* ENV protection ON by default */
 	flash_protect(FLAG_PROTECT_SET,
 		      CONFIG_ENV_ADDR,
 		      CONFIG_ENV_ADDR+CONFIG_ENV_SECT_SIZE-1,
 		      &flash_info[0]);
 #endif
 	return total;
 }

 /*-----------------------------------------------------------------------
  */
 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_28F008S5:	printf ("28F008S5\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 % 4) == 0)
 			printf ("\n   ");
 		printf (" %2d - %08lX%s", i,
 			info->start[i],
 			info->protect[i] ? " (RO)" : "     "
 		);
 	}
 	printf ("\n");
 	return;
 }

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


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

 /*
  * The following code cannot be run from FLASH!
  */

 int
 flash_erase(flash_info_t *info, int s_first, int s_last)
 {
 	int prot, sect, haderr;
 	ulong start, now, last;
 	void (*erase_init)(flash_info_t *, int);
 	int (*erase_poll)(flash_info_t *, int);
 	void (*reset)(flash_info_t *, int);
 	int rcode = 0;

 #ifdef FLASH_DEBUG
 	printf("\nflash_erase: erase %d sectors (%d to %d incl.) from\n"
 		"  Bank # %d: ", s_last - s_first + 1, s_first, s_last,
 		(info - flash_info) + 1);
 	flash_print_info(info);
 #endif

 	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;
 	}

 	switch (info->flash_id) {

 #if defined(CONFIG_CMA302)
 	case FLASH_MAN_INTEL|FLASH_28F008S5:
 		erase_init = c302f_erase_init;
 		erase_poll = c302f_erase_poll;
 		reset = c302f_reset;
 		break;
 #endif

 #if (CMA_MB_CAPS & CMA_MB_CAP_FLASH)
 	case FLASH_MAN_INTEL|FLASH_28F800_B:
 	case FLASH_MAN_AMD|FLASH_AM29F800B:
 		/* not yet ...
 		erase_init = cmbf_erase_init;
 		erase_poll = cmbf_erase_poll;
 		reset = cmbf_reset;
 		break;
 		*/
 #endif

 	default:
 		printf ("Flash type %08lx not supported - aborted\n",
 			info->flash_id);
 		return 1;
 	}

 	prot = 0;
 	for (sect=s_first; sect<=s_last; ++sect) {
 		if (info->protect[sect]) {
 			prot++;
 		}
 	}

 	if (prot) {
 		printf("- Warning: %d protected sector%s will not be erased!\n",
 			prot, (prot > 1 ? "s" : ""));
 	}

 	start = get_timer (0);
 	last = 0;
 	haderr = 0;

 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			ulong estart;
 			int sectdone;

 			(*erase_init)(info, sect);

 			/* wait at least 80us - let's wait 1 ms */
 			udelay (1000);

 			estart = get_timer(start);

 			do {
 				now = get_timer(start);

 				if (now - estart > CONFIG_SYS_FLASH_ERASE_TOUT) {
 					printf ("Timeout (sect %d)\n", sect);
 					haderr = 1;
 					break;
 				}

 #ifndef FLASH_DEBUG
 				/* show that we're waiting */
 				if ((now - last) > 1000) { /* every second */
 					putc ('.');
 					last = now;
 				}
 #endif

 				sectdone = (*erase_poll)(info, sect);

 				if (sectdone < 0) {
 					haderr = 1;
 					break;
 				}

 			} while (!sectdone);

 			if (haderr)
 				break;
 		}
 	}

 	if (haderr > 0) {
 		printf (" failed\n");
 		rcode = 1;
 	}
 	else
 		printf (" done\n");

 	/* reset to read mode */
 	for (sect = s_first; sect <= s_last; sect++) {
 		if (info->protect[sect] == 0) {	/* not protected */
 			(*reset)(info, sect);
 		}
 	}
 	return rcode;
 }

 /*-----------------------------------------------------------------------
  * Copy memory to flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  * 3 - write error
  */

 int
 write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 {
 	ulong cp, wp, data;
 	int i, l, rc;
 	ulong start, now, last;

 	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);
 		}
 		for (; i<4 && cnt>0; ++i) {
 			data = (data << 8) | *src++;
 			--cnt;
 			++cp;
 		}
 		for (; cnt==0 && i<4; ++i, ++cp) {
 			data = (data << 8) | (*(uchar *)cp);
 		}

 		if ((rc = write_word(info, wp, data)) != 0) {
 			return (rc);
 		}
 		wp += 4;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	start = get_timer (0);
 	last = 0;
 	while (cnt >= 4) {
 		data = 0;
 		for (i=0; i<4; ++i) {
 			data = (data << 8) | *src++;
 		}
 		if ((rc = write_word(info, wp, data)) != 0) {
 			return (rc);
 		}
 		wp  += 4;
 		cnt -= 4;

 		/* show that we're waiting */
 		now = get_timer(start);
 		if ((now - last) > 1000) {	/* every second */
 			putc ('.');
 			last = now;
 		}
 	}

 	if (cnt == 0) {
 		return (0);
 	}

 	/*
 	 * handle unaligned tail bytes
 	 */
 	data = 0;
 	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
 		data = (data << 8) | *src++;
 		--cnt;
 	}
 	for (; i<4; ++i, ++cp) {
 		data = (data << 8) | (*(uchar *)cp);
 	}

 	return (write_word(info, wp, data));
 }

 /*-----------------------------------------------------------------------
  * Write a word to Flash, returns:
  * 0 - OK
  * 1 - write timeout
  * 2 - Flash not erased
  * 3 - write error
  */
 static int
 write_word(flash_info_t *info, ulong dest, ulong data)
 {
 	int retval;

 	/* Check if Flash is (sufficiently) erased */
 	if ((*(ulong *)dest & data) != data) {
 		return (2);
 	}

 	switch (info->flash_id) {

 #if defined(CONFIG_CMA302)
 	case FLASH_MAN_INTEL|FLASH_28F008S5:
 		retval = c302f_write_word((c302f_addr_t)dest, (c302f_word_t)data);
 		break;
 #endif

 #if (CMA_MB_CAPS & CMA_MB_CAP_FLASH)
 	case FLASH_MAN_INTEL|FLASH_28F800_B:
 	case FLASH_MAN_AMD|FLASH_AM29F800B:
 		/* not yet ...
 		retval = cmbf_write_word((cmbf_addr_t)dest, (cmbf_word_t)data);
 		*/
 		retval = 3;
 		break;
 #endif

 	default:
 		printf ("Flash type %08lx not supported - aborted\n",
 			info->flash_id);
 		retval = 3;
 		break;
 	}

 	return (retval);
 }

 /*-----------------------------------------------------------------------
  */
	/*
	* (C) Copyright 2000
	* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include "flash.h"
	#include <linux/compiler.h>

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

	#if defined(CONFIG_ENV_IS_IN_FLASH)
	# ifndef CONFIG_ENV_ADDR
	# define CONFIG_ENV_ADDR (CONFIG_SYS_FLASH_BASE + CONFIG_ENV_OFFSET)
	# endif
	# ifndef CONFIG_ENV_SIZE
	# define CONFIG_ENV_SIZE CONFIG_ENV_SECT_SIZE
	# endif
	# ifndef CONFIG_ENV_SECT_SIZE
	# define CONFIG_ENV_SECT_SIZE CONFIG_ENV_SIZE
	# endif
	#endif

	/*-----------------------------------------------------------------------
	* Functions
	*/
	static int write_word (flash_info_t *info, ulong dest, ulong data);

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


	#if defined(CONFIG_CMA302)

	/*
	* probe for the existence of flash at address "addr"
	* 0 = yes, 1 = bad Manufacturer's Id, 2 = bad Device Id
	*/
	static int
	c302f_probe_word(c302f_addr_t addr)
	{
	/* reset the flash */
	*addr = C302F_BNK_CMD_RST;

	/* check the manufacturer id */
	*addr = C302F_BNK_CMD_RD_ID;
	if (*C302F_BNK_ADDR_MAN(addr) != C302F_BNK_RD_ID_MAN)
	return 1;

	/* check the device id */
	*addr = C302F_BNK_CMD_RD_ID;
	if (*C302F_BNK_ADDR_DEV(addr) != C302F_BNK_RD_ID_DEV)
	return 2;

	#ifdef FLASH_DEBUG
	{
	int i;

	printf("\nMaster Lock Config = 0x%08lx\n",
	*C302F_BNK_ADDR_CFGM(addr));
	for (i = 0; i < C302F_BNK_NBLOCKS; i++)
	printf("Block %2d Lock Config = 0x%08lx\n",
	i, *C302F_BNK_ADDR_CFG(i, addr));
	}
	#endif

	/* reset the flash again */
	*addr = C302F_BNK_CMD_RST;

	return 0;
	}

	/*
	* probe for Cogent CMA302 flash module at address "base" and store
	* info for any found into flash_info entry "fip". Must find at least
	* one bank.
	*/
	static void
	c302f_probe(flash_info_t *fip, c302f_addr_t base)
	{
	c302f_addr_t addr, eaddr;
	int nbanks;

	fip->size = 0L;
	fip->sector_count = 0;

	addr = base;
	eaddr = C302F_BNK_ADDR_BASE(addr, C302F_MAX_BANKS);
	nbanks = 0;

	while (addr < eaddr) {
	c302f_addr_t addrw, eaddrw, addrb;
	int i, osc, nsc;

	addrw = addr;
	eaddrw = C302F_BNK_ADDR_NEXT_WORD(addrw);

	while (addrw < eaddrw)
	if (c302f_probe_word(addrw++) != 0)
	goto out;

	/* bank exists - append info for this bank to fip /
	fip->flash_id = FLASH_MAN_INTEL\|FLASH_28F008S5;
	fip->size += C302F_BNK_SIZE;
	osc = fip->sector_count;
	fip->sector_count += C302F_BNK_NBLOCKS;
	if ((nsc = fip->sector_count) >= CONFIG_SYS_MAX_FLASH_SECT)
	panic("Too many sectors in flash at address 0x%08lx\n",
	(unsigned long)base);

	addrb = addr;
	for (i = osc; i < nsc; i++) {
	fip->start[i] = (ulong)addrb;
	fip->protect[i] = 0;
	addrb = C302F_BNK_ADDR_NEXT_BLK(addrb);
	}

	addr = C302F_BNK_ADDR_NEXT_BNK(addr);
	nbanks++;
	}

	out:
	if (nbanks == 0)
	panic("ERROR: no flash found at address 0x%08lx\n",
	(unsigned long)base);
	}

	static void
	c302f_reset(flash_info_t *info, int sect)
	{
	c302f_addr_t addrw, eaddrw;

	addrw = (c302f_addr_t)info->start[sect];
	eaddrw = C302F_BNK_ADDR_NEXT_WORD(addrw);

	while (addrw < eaddrw) {
	#ifdef FLASH_DEBUG
	printf(" writing reset cmd to addr 0x%08lx\n",
	(unsigned long)addrw);
	#endif
	*addrw = C302F_BNK_CMD_RST;
	addrw++;
	}
	}

	static void
	c302f_erase_init(flash_info_t *info, int sect)
	{
	c302f_addr_t addrw, saddrw, eaddrw;
	int flag;

	#ifdef FLASH_DEBUG
	printf("0x%08lx C302F_BNK_CMD_PROG\n", C302F_BNK_CMD_PROG);
	printf("0x%08lx C302F_BNK_CMD_ERASE1\n", C302F_BNK_CMD_ERASE1);
	printf("0x%08lx C302F_BNK_CMD_ERASE2\n", C302F_BNK_CMD_ERASE2);
	printf("0x%08lx C302F_BNK_CMD_CLR_STAT\n", C302F_BNK_CMD_CLR_STAT);
	printf("0x%08lx C302F_BNK_CMD_RST\n", C302F_BNK_CMD_RST);
	printf("0x%08lx C302F_BNK_STAT_RDY\n", C302F_BNK_STAT_RDY);
	printf("0x%08lx C302F_BNK_STAT_ERR\n", C302F_BNK_STAT_ERR);
	#endif

	saddrw = (c302f_addr_t)info->start[sect];
	eaddrw = C302F_BNK_ADDR_NEXT_WORD(saddrw);

	#ifdef FLASH_DEBUG
	printf("erasing sector %d, start addr = 0x%08lx "
	"(bank next word addr = 0x%08lx)\n", sect,
	(unsigned long)saddrw, (unsigned long)eaddrw);
	#endif

	/* Disable intrs which might cause a timeout here */
	flag = disable_interrupts();

	for (addrw = saddrw; addrw < eaddrw; addrw++) {
	#ifdef FLASH_DEBUG
	printf(" writing erase cmd to addr 0x%08lx\n",
	(unsigned long)addrw);
	#endif
	*addrw = C302F_BNK_CMD_ERASE1;
	*addrw = C302F_BNK_CMD_ERASE2;
	}

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts();
	}

	static int
	c302f_erase_poll(flash_info_t *info, int sect)
	{
	c302f_addr_t addrw, saddrw, eaddrw;
	int sectdone, haderr;

	saddrw = (c302f_addr_t)info->start[sect];
	eaddrw = C302F_BNK_ADDR_NEXT_WORD(saddrw);

	sectdone = 1;
	haderr = 0;

	for (addrw = saddrw; addrw < eaddrw; addrw++) {
	c302f_word_t stat = *addrw;

	#ifdef FLASH_DEBUG
	printf(" checking status at addr "
	"0x%08lx [0x%08lx]\n",
	(unsigned long)addrw, stat);
	#endif
	if ((stat & C302F_BNK_STAT_RDY) != C302F_BNK_STAT_RDY)
	sectdone = 0;
	else if ((stat & C302F_BNK_STAT_ERR) != 0) {
	printf(" failed on sector %d "
	"(stat = 0x%08lx) at "
	"address 0x%08lx\n",
	sect, stat,
	(unsigned long)addrw);
	*addrw = C302F_BNK_CMD_CLR_STAT;
	haderr = 1;
	}
	}

	if (haderr)
	return (-1);
	else
	return (sectdone);
	}

	static int
	c302f_write_word(c302f_addr_t addr, c302f_word_t value)
	{
	c302f_word_t stat;
	ulong start;
	int flag, retval;

	/* Disable interrupts which might cause a timeout here */
	flag = disable_interrupts();

	*addr = C302F_BNK_CMD_PROG;

	*addr = value;

	/* re-enable interrupts if necessary */
	if (flag)
	enable_interrupts();

	retval = 0;

	/* data polling for D7 */
	start = get_timer (0);
	do {
	if (get_timer(start) > CONFIG_SYS_FLASH_WRITE_TOUT) {
	retval = 1;
	goto done;
	}
	stat = *addr;
	} while ((stat & C302F_BNK_STAT_RDY) != C302F_BNK_STAT_RDY);

	if ((stat & C302F_BNK_STAT_ERR) != 0) {
	printf("flash program failed (stat = 0x%08lx) "
	"at address 0x%08lx\n", (ulong)stat, (ulong)addr);
	*addr = C302F_BNK_CMD_CLR_STAT;
	retval = 3;
	}

	done:
	/* reset to read mode */
	*addr = C302F_BNK_CMD_RST;

	return (retval);
	}

	#endif /* CONFIG_CMA302 */

	unsigned long
	flash_init(void)
	{
	unsigned long total;
	int i;
	__maybe_unused flash_info_t *fip;

	/* Init: no FLASHes known */
	for (i=0; i<CONFIG_SYS_MAX_FLASH_BANKS; ++i) {
	flash_info[i].flash_id = FLASH_UNKNOWN;
	}

	fip = &flash_info[0];
	total = 0L;

	#if defined(CONFIG_CMA302)
	c302f_probe(fip, (c302f_addr_t)CONFIG_SYS_FLASH_BASE);
	total += fip->size;
	fip++;
	#endif

	#if (CMA_MB_CAPS & CMA_MB_CAP_FLASH)
	/* not yet ...
	cmbf_probe(fip, (cmbf_addr_t)CMA_MB_FLASH_BASE);
	total += fip->size;
	fip++;
	*/
	#endif

	/*
	* protect monitor and environment sectors
	*/

	#if CONFIG_SYS_MONITOR_BASE == CONFIG_SYS_FLASH_BASE
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_SYS_MONITOR_BASE,
	CONFIG_SYS_MONITOR_BASE+monitor_flash_len-1,
	&flash_info[0]);
	#endif

	#ifdef CONFIG_ENV_IS_IN_FLASH
	/* ENV protection ON by default */
	flash_protect(FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR+CONFIG_ENV_SECT_SIZE-1,
	&flash_info[0]);
	#endif
	return total;
	}

	/*-----------------------------------------------------------------------
	*/
	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_28F008S5: printf ("28F008S5\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 % 4) == 0)
	printf ("\n ");
	printf (" %2d - %08lX%s", i,
	info->start[i],
	info->protect[i] ? " (RO)" : " "
	);
	}
	printf ("\n");
	return;
	}

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


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

	/*
	* The following code cannot be run from FLASH!
	*/

	int
	flash_erase(flash_info_t *info, int s_first, int s_last)
	{
	int prot, sect, haderr;
	ulong start, now, last;
	void (erase_init)(flash_info_t , int);
	int (erase_poll)(flash_info_t , int);
	void (reset)(flash_info_t , int);
	int rcode = 0;

	#ifdef FLASH_DEBUG
	printf("\nflash_erase: erase %d sectors (%d to %d incl.) from\n"
	" Bank # %d: ", s_last - s_first + 1, s_first, s_last,
	(info - flash_info) + 1);
	flash_print_info(info);
	#endif

	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;
	}

	switch (info->flash_id) {

	#if defined(CONFIG_CMA302)
	case FLASH_MAN_INTEL\|FLASH_28F008S5:
	erase_init = c302f_erase_init;
	erase_poll = c302f_erase_poll;
	reset = c302f_reset;
	break;
	#endif

	#if (CMA_MB_CAPS & CMA_MB_CAP_FLASH)
	case FLASH_MAN_INTEL\|FLASH_28F800_B:
	case FLASH_MAN_AMD\|FLASH_AM29F800B:
	/* not yet ...
	erase_init = cmbf_erase_init;
	erase_poll = cmbf_erase_poll;
	reset = cmbf_reset;
	break;
	*/
	#endif

	default:
	printf ("Flash type %08lx not supported - aborted\n",
	info->flash_id);
	return 1;
	}

	prot = 0;
	for (sect=s_first; sect<=s_last; ++sect) {
	if (info->protect[sect]) {
	prot++;
	}
	}

	if (prot) {
	printf("- Warning: %d protected sector%s will not be erased!\n",
	prot, (prot > 1 ? "s" : ""));
	}

	start = get_timer (0);
	last = 0;
	haderr = 0;

	for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	ulong estart;
	int sectdone;

	(*erase_init)(info, sect);

	/* wait at least 80us - let's wait 1 ms */
	udelay (1000);

	estart = get_timer(start);

	do {
	now = get_timer(start);

	if (now - estart > CONFIG_SYS_FLASH_ERASE_TOUT) {
	printf ("Timeout (sect %d)\n", sect);
	haderr = 1;
	break;
	}

	#ifndef FLASH_DEBUG
	/* show that we're waiting */
	if ((now - last) > 1000) { /* every second */
	putc ('.');
	last = now;
	}
	#endif

	sectdone = (*erase_poll)(info, sect);

	if (sectdone < 0) {
	haderr = 1;
	break;
	}

	} while (!sectdone);

	if (haderr)
	break;
	}
	}

	if (haderr > 0) {
	printf (" failed\n");
	rcode = 1;
	}
	else
	printf (" done\n");

	/* reset to read mode */
	for (sect = s_first; sect <= s_last; sect++) {
	if (info->protect[sect] == 0) { /* not protected */
	(*reset)(info, sect);
	}
	}
	return rcode;
	}

	/*-----------------------------------------------------------------------
	* Copy memory to flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	* 3 - write error
	*/

	int
	write_buff(flash_info_t info, uchar src, ulong addr, ulong cnt)
	{
	ulong cp, wp, data;
	int i, l, rc;
	ulong start, now, last;

	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);
	}
	for (; i<4 && cnt>0; ++i) {
	data = (data << 8) \| *src++;
	--cnt;
	++cp;
	}
	for (; cnt==0 && i<4; ++i, ++cp) {
	data = (data << 8) \| ((uchar )cp);
	}

	if ((rc = write_word(info, wp, data)) != 0) {
	return (rc);
	}
	wp += 4;
	}

	/*
	* handle word aligned part
	*/
	start = get_timer (0);
	last = 0;
	while (cnt >= 4) {
	data = 0;
	for (i=0; i<4; ++i) {
	data = (data << 8) \| *src++;
	}
	if ((rc = write_word(info, wp, data)) != 0) {
	return (rc);
	}
	wp += 4;
	cnt -= 4;

	/* show that we're waiting */
	now = get_timer(start);
	if ((now - last) > 1000) { /* every second */
	putc ('.');
	last = now;
	}
	}

	if (cnt == 0) {
	return (0);
	}

	/*
	* handle unaligned tail bytes
	*/
	data = 0;
	for (i=0, cp=wp; i<4 && cnt>0; ++i, ++cp) {
	data = (data << 8) \| *src++;
	--cnt;
	}
	for (; i<4; ++i, ++cp) {
	data = (data << 8) \| ((uchar )cp);
	}

	return (write_word(info, wp, data));
	}

	/*-----------------------------------------------------------------------
	* Write a word to Flash, returns:
	* 0 - OK
	* 1 - write timeout
	* 2 - Flash not erased
	* 3 - write error
	*/
	static int
	write_word(flash_info_t *info, ulong dest, ulong data)
	{
	int retval;

	/* Check if Flash is (sufficiently) erased */
	if (((ulong )dest & data) != data) {
	return (2);
	}

	switch (info->flash_id) {

	#if defined(CONFIG_CMA302)
	case FLASH_MAN_INTEL\|FLASH_28F008S5:
	retval = c302f_write_word((c302f_addr_t)dest, (c302f_word_t)data);
	break;
	#endif

	#if (CMA_MB_CAPS & CMA_MB_CAP_FLASH)
	case FLASH_MAN_INTEL\|FLASH_28F800_B:
	case FLASH_MAN_AMD\|FLASH_AM29F800B:
	/* not yet ...
	retval = cmbf_write_word((cmbf_addr_t)dest, (cmbf_word_t)data);
	*/
	retval = 3;
	break;
	#endif

	default:
	printf ("Flash type %08lx not supported - aborted\n",
	info->flash_id);
	retval = 3;
	break;
	}

	return (retval);
	}

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