board/modnet50/flash.c - github/trini/u-boot - Gitiles

 /*
  * (C) Copyright 2002
  * MAZeT GmbH <www.mazet.de>
  * Stephan Linz <linz@mazet.de>, <linz@li-pro.net>
  *
  * The most stuff comes from PPCBoot and Linux.
  *
  * IMMS gGmbH <www.imms.de>
  * Thomas Elste <info@elste.org>
  *
  * Modifications for ModNET50 Board
  *
  * 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/arch/netarm_registers.h>

 #define SCR   (*(volatile unsigned int *)(NETARM_GEN_MODULE_BASE + NETARM_GEN_SYSTEM_CONTROL))

 #define ALIGN_ABORT_OFF		SCR = SCR & ~NETARM_GEN_SYS_CFG_ALIGN_ABORT
 #define ALIGN_ABORT_ON		SCR = SCR |  NETARM_GEN_SYS_CFG_ALIGN_ABORT

 #define PROG_ADDR		(0x555*2)
 #define SETUP_ADDR		(0x555*2)
 #define ID_ADDR			(0x555*2)
 #define UNLOCK_ADDR1		(0x555*2)
 #define UNLOCK_ADDR2		(0x2AA*2)

 #define UNLOCK_CMD1		(0xAA)
 #define UNLOCK_CMD2		(0x55)
 #define ERASE_SUSPEND_CMD	(0xB0)
 #define ERASE_RESUME_CMD	(0x30)
 #define RESET_CMD		(0xF0)
 #define ID_CMD			(0x90)
 #define SECERASE_CMD		(0x30)
 #define CHIPERASE_CMD		(0x10)
 #define PROG_CMD		(0xa0)
 #define SETUP_CMD		(0x80)

 #define DQ2			(0x04)
 #define DQ3			(DQ2*2)
 #define DQ5			(DQ3*4)
 #define DQ6			(DQ5*2)

 #define WRITE_UNLOCK(addr) { \
   *(volatile __u16*)(addr + UNLOCK_ADDR1) = (__u16)UNLOCK_CMD1; \
   *(volatile __u16*)(addr + UNLOCK_ADDR2) = (__u16)UNLOCK_CMD2; \
 }

 #define CONFIG_AM29_RESERVED	(0)
 #define K			(1024)
 #define MB			(4)

 #define CELL_SIZE		(64*K)
 #define DEVICE_SIZE		(MB*K*K)
 #define CELLS_PER_DEVICE	(DEVICE_SIZE/CELL_SIZE)
 #define RESERVED_CELLS		(CONFIG_AM29_RESERVED*K)/CELL_SIZE
 #define MAX_FLASH_DEVICES	(1)
 #define AVAIL_SIZE		(DEVICE_SIZE*MAX_FLASH_DEVICES - RESERVED_CELLS*CELL_SIZE)


 flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
 static __u16 toggling_bits;


 /*-----------------------------------------------------------------------
  */
 ulong flash_get_size (ulong baseaddr, flash_info_t * info)
 {
 	short i;
 	__u16 flashtest;

 	/* Write auto select command sequence and test FLASH answer */
 	WRITE_UNLOCK (baseaddr);
 	*(volatile __u16 *) (baseaddr + ID_ADDR) = (__u16) ID_CMD;
 	flashtest /* manufacturer ID */  = *(volatile __u16 *) (baseaddr);
 	*(volatile __u16 *) (baseaddr + ID_ADDR) = (__u16) RESET_CMD;

 	switch ((__u32) ((flashtest << 16) + flashtest)) {
 	case AMD_MANUFACT:
 		info->flash_id = FLASH_MAN_AMD & FLASH_VENDMASK;
 		break;
 	case FUJ_MANUFACT:
 		info->flash_id = FLASH_MAN_FUJ & FLASH_VENDMASK;
 		break;
 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		info->sector_count = 0;
 		info->size = 0;
 		return (0);	/* no or unknown flash */
 	}

 	/* Write auto select command sequence and test FLASH answer */
 	WRITE_UNLOCK (baseaddr);
 	*(volatile __u16 *) (baseaddr + ID_ADDR) = (__u16) ID_CMD;
 	flashtest /* device ID */  = *(volatile __u16 *) (baseaddr + 2);
 	*(volatile __u16 *) (baseaddr + ID_ADDR) = (__u16) RESET_CMD;

 	/* toggling_bits = (flashtest == TOSHIBA)?(DQ6):(DQ2|DQ6); */
 	toggling_bits = (DQ2 | DQ6);

 	switch ((__u32) ((flashtest << 16) + flashtest)) {
 	case AMD_ID_LV160B:
 		info->flash_id +=
 			(FLASH_AM160LV | FLASH_AM160B) & FLASH_TYPEMASK;
 		info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
 		info->size = CONFIG_SYS_FLASH_SIZE;
 		/* 1*16K Boot Block
 		   2*8K Parameter Block
 		   1*32K Small Main Block */
 		info->start[0] = baseaddr;
 		info->start[1] = baseaddr + 0x4000;
 		info->start[2] = baseaddr + 0x6000;
 		info->start[3] = baseaddr + 0x8000;
 		for (i = 1; i < info->sector_count; i++)
 			info->start[3 + i] = baseaddr + i * CONFIG_SYS_MAIN_SECT_SIZE;
 		break;
 	default:
 		info->flash_id = FLASH_UNKNOWN;
 		return (0);	/* no or unknown flash */
 	}

 	for (i = 0; i < info->sector_count; i++) {
 		/* Write auto select command sequence and test FLASH answer */
 		WRITE_UNLOCK (info->start[i]);
 		*(volatile __u16 *) (info->start[i] + ID_ADDR) = (__u16) ID_CMD;
 		flashtest /* protected verify */  = *(volatile __u16 *) (info->start[i] + 4);
 		*(volatile __u16 *) (info->start[i] + ID_ADDR) = (__u16) RESET_CMD;
 		if (flashtest & 0x0001) {
 			info->protect[i] = 1;	/* D0 = 1 if protected */
 		} else {
 			info->protect[i] = 0;
 		}
 	}
 	return (info->size);
 }

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

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

 	/* Static FLASH Bank configuration here (only one bank) */
 	size = flash_get_size (CONFIG_SYS_FLASH_BASE, &flash_info[0]);

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

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

 	flash_protect (FLAG_PROTECT_SET,
 		       CONFIG_ENV_ADDR,
 		       CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0]);

 	return 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_AMD:
 		printf ("AMD ");
 		break;
 	case FLASH_MAN_FUJ:
 		printf ("Fujitsu ");
 		break;
 	default:
 		printf ("Unknown Vendor ");
 		break;
 	}

 	switch (info->flash_id & FLASH_TYPEMASK) {
 	case FLASH_AMDL323B:
 		printf ("29DL323B (32 M, bottom sector)\n");
 		break;
 	case (FLASH_AM160LV | FLASH_AM160B):
 		printf ("29LV160BE (1M x 16, bottom sector)\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 (" S%02d @ 0x%08lX%s", i,
 			info->start[i], info->protect[i] ? " !" : "  ");
 	}
 	printf ("\n");
 	return;
 }

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

 	for (sect = s_first; sect <= s_last; sect++)
 		if (info->protect[sect])
 			prot++;
 	if (prot)
 		printf ("- can't erase %d protected sectors\n", prot);
 	return prot;
 }

 /*-----------------------------------------------------------------------
  */
 int flash_check_erase_amd (ulong start)
 {
 	__u16 v1, v2;

 	v1 = *(volatile __u16 *) (start);
 	v2 = *(volatile __u16 *) (start);

 	if (((v1 ^ v2) & toggling_bits) == toggling_bits) {
 		if (((v1 | v2) & DQ5) == DQ5) {
 			printf ("[DQ5] ");
 			/* OOPS: exceeded timing limits */

 			v1 = *(volatile __u16 *) (start);
 			v2 = *(volatile __u16 *) (start);

 			if (((v1 ^ v2) & toggling_bits) == toggling_bits) {

 				printf ("[%s] ",
 					((toggling_bits & (DQ2 | DQ6)) ==
 					 (DQ2 | DQ6)) ? "DQ2,DQ6" : "DQ6");

 				/* OOPS: there is an erasure in progress,
 				 *       try to reset chip */
 				*(volatile __u16 *) (start) =
 					(__u16) RESET_CMD;

 				return 1;	/* still busy */
 			}
 		}
 		return 1;	/* still busy */
 	}
 	return 0;		/* be free */
 }

 /*-----------------------------------------------------------------------
  */
 int flash_erase (flash_info_t * info, int s_first, int s_last)
 {
 	int flag, sect, setup_offset = 0;
 	int rc = ERR_OK;

 	if (info->flash_id == FLASH_UNKNOWN) {
 		printf ("- missing\n");
 		return ERR_UNKNOWN_FLASH_TYPE;
 	}

 	if ((s_first < 0) || (s_first > s_last)) {
 		printf ("- no sectors to erase\n");
 		return ERR_INVAL;
 	}

 	if (flash_check_protection (info, s_first, s_last))
 		return ERR_PROTECTED;

 	switch (info->flash_id & FLASH_VENDMASK) {
 	case FLASH_MAN_FUJ:
 	case FLASH_MAN_AMD:
 		switch (info->flash_id & FLASH_TYPEMASK) {
 		case (FLASH_AM160LV | FLASH_AM160B):
 			setup_offset = UNLOCK_ADDR1;	/* just the adress for setup_cmd differs */
 		case FLASH_AMDL323B:
 			/*
 			 * Disable interrupts which might cause a timeout
 			 * here. Remember that our exception vectors are
 			 * at address 0 in the flash, and we don't want a
 			 * (ticker) exception to happen while the flash
 			 * chip is in programming mode.
 			 */
 			flag = disable_interrupts ();
 			/* Start erase on unprotected sectors */
 			for (sect = s_first; sect <= s_last && !ctrlc ();
 			     sect++) {
 				printf ("Erasing sector %2d ... ", sect);

 				if (info->protect[sect] == 0) {
 					/* not protected */
 					/* Write sector erase command sequence */
 					WRITE_UNLOCK (info->start[0]);
 					*(volatile __u16 *) (info->start[0] +
 							     setup_offset) =
 						(__u16) SETUP_CMD;
 					WRITE_UNLOCK (info->start[0]);
 					*(volatile __u16 *) (info->
 							     start[sect]) =
 						(__u16) SECERASE_CMD;

 					/* wait some time */
 					reset_timer_masked ();
 					while (get_timer_masked () < 1000) {
 					}

 					/* arm simple, non interrupt dependent timer */
 					reset_timer_masked ();
 					while (flash_check_erase_amd (info->start[sect])) {
 						if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
 							printf ("timeout!\n");
 							/* OOPS: reach timeout,
 							 * try to reset chip
 							 */
 							*(volatile __u16 *) (info-> start[sect]) = (__u16) RESET_CMD;
 							rc = ERR_TIMOUT;
 							goto outahere_323B;
 						}
 					}
 					printf ("ok.\n");
 				} else {
 					printf ("protected!\n");
 				}
 			}
 			if (ctrlc ())
 				printf ("User Interrupt!\n");
 outahere_323B:
 			/* allow flash to settle - wait 10 ms */
 			udelay_masked (10000);
 			if (flag)
 				enable_interrupts ();
 			return rc;
 		default:
 			printf ("- unknown chip type\n");
 			return ERR_UNKNOWN_FLASH_TYPE;
 		}
 		break;
 	default:
 		printf ("- unknown vendor ");
 		return ERR_UNKNOWN_FLASH_VENDOR;
 	}
 }

 /*-----------------------------------------------------------------------
  */
 int flash_check_write_amd (ulong dest)
 {
 	__u16 v1, v2;

 	v1 = *(volatile __u16 *) (dest);
 	v2 = *(volatile __u16 *) (dest);

 	/* DQ6 toggles during write */
 	if (((v1 ^ v2) & DQ6) == DQ6) {
 		if (((v1 | v2) & DQ5) == DQ5) {
 			printf ("[DQ5] @ %08lX\n", dest);

 			/* OOPS: exceeded timing limits,
 			 *       try to reset chip */
 			*(volatile __u16 *) (dest) = (__u16) RESET_CMD;
 			return 0;	/* be free */
 		}
 		return 1;	/* still busy */
 	}

 	return 0;		/* be free */
 }

 /*-----------------------------------------------------------------------
  * Copy memory to flash
  */
 static int write_word (flash_info_t * info, ulong dest, ushort data)
 {
 	int rc = ERR_OK;
 	int flag;

 	/* Check if Flash is (sufficiently) erased */
 	if ((*(__u16 *) (dest) & data) != data)
 		return ERR_NOT_ERASED;

 	/*
 	 * Disable interrupts which might cause a timeout
 	 * here. Remember that our exception vectors are
 	 * at address 0 in the flash, and we don't want a
 	 * (ticker) exception to happen while the flash
 	 * chip is in programming mode.
 	 */
 	flag = disable_interrupts ();

 	/* Write program command sequence */
 	WRITE_UNLOCK (info->start[0]);

 	/* Flash dependend program seqence */
 	switch (info->flash_id & FLASH_VENDMASK) {
 	case FLASH_MAN_FUJ:
 	case FLASH_MAN_AMD:
 		switch (info->flash_id & FLASH_TYPEMASK) {
 		case (FLASH_AM160LV | FLASH_AM160B):
 			*(volatile __u16 *) (info->start[0] + UNLOCK_ADDR1) =
 				(__u16) PROG_CMD;
 			*(volatile __u16 *) (dest) = (__u16) data;
 			break;
 		case FLASH_AMDL323B:
 			*(volatile __u16 *) (dest) = (__u16) PROG_CMD;
 			*(volatile __u16 *) (dest) = (__u16) data;
 			break;
 		}
 	}

 	/* arm simple, non interrupt dependent timer */
 	reset_timer_masked ();

 	while (flash_check_write_amd (dest)) {
 		if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
 			printf ("timeout! @ %08lX\n", dest);
 			/* OOPS: reach timeout,
 			 *       try to reset chip */
 			*(volatile __u16 *) (dest) = (__u16) RESET_CMD;

 			rc = ERR_TIMOUT;
 			goto outahere_323B;
 		}
 	}

 	/* Check if Flash was (accurately) written */
 	if (*(__u16 *) (dest) != data)
 		rc = ERR_PROG_ERROR;

 outahere_323B:
 	if (flag)
 		enable_interrupts ();
 	return rc;
 }

 /*-----------------------------------------------------------------------
  * Copy memory to flash.
  */
 int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 {
 	ulong cp, wp;
 	ushort data;
 	int l;
 	int i, rc;

 	wp = (addr & ~1);	/* 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 << 8);
 		}
 		for (; i < 2 && cnt > 0; ++i) {
 			data = (data >> 8) | (*src++ << 8);
 			--cnt;
 			++cp;
 		}
 		for (; cnt == 0 && i < 2; ++i, ++cp) {
 			data = (data >> 8) | (*(uchar *) cp << 8);
 		}

 		if ((rc = write_word (info, wp, data)) != 0) {
 			return (rc);
 		}
 		wp += 2;
 	}

 	/*
 	 * handle word aligned part
 	 */
 	while (cnt >= 2) {
 		data = *((ushort *) src);
 		if ((rc = write_word (info, wp, data)) != 0)
 			return (rc);
 		src += 2;
 		wp += 2;
 		cnt -= 2;
 	}

 	if (cnt == 0)
 		return ERR_OK;

 	/*
 	 * handle unaligned tail bytes
 	 */
 	data = 0;
 	for (i = 0, cp = wp; i < 2 && cnt > 0; ++i, ++cp) {
 		data = (data >> 8) | (*src++ << 8);
 		--cnt;
 	}
 	for (; i < 2; ++i, ++cp) {
 		data = (data >> 8) | (*(uchar *) cp << 8);
 	}

 	return write_word (info, wp, data);
 }
	/*
	* (C) Copyright 2002
	* MAZeT GmbH <www.mazet.de>
	* Stephan Linz <linz@mazet.de>, <linz@li-pro.net>
	*
	* The most stuff comes from PPCBoot and Linux.
	*
	* IMMS gGmbH <www.imms.de>
	* Thomas Elste <info@elste.org>
	*
	* Modifications for ModNET50 Board
	*
	* 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/arch/netarm_registers.h>

	#define SCR ((volatile unsigned int )(NETARM_GEN_MODULE_BASE + NETARM_GEN_SYSTEM_CONTROL))

	#define ALIGN_ABORT_OFF SCR = SCR & ~NETARM_GEN_SYS_CFG_ALIGN_ABORT
	#define ALIGN_ABORT_ON SCR = SCR \| NETARM_GEN_SYS_CFG_ALIGN_ABORT

	#define PROG_ADDR (0x555*2)
	#define SETUP_ADDR (0x555*2)
	#define ID_ADDR (0x555*2)
	#define UNLOCK_ADDR1 (0x555*2)
	#define UNLOCK_ADDR2 (0x2AA*2)

	#define UNLOCK_CMD1 (0xAA)
	#define UNLOCK_CMD2 (0x55)
	#define ERASE_SUSPEND_CMD (0xB0)
	#define ERASE_RESUME_CMD (0x30)
	#define RESET_CMD (0xF0)
	#define ID_CMD (0x90)
	#define SECERASE_CMD (0x30)
	#define CHIPERASE_CMD (0x10)
	#define PROG_CMD (0xa0)
	#define SETUP_CMD (0x80)

	#define DQ2 (0x04)
	#define DQ3 (DQ2*2)
	#define DQ5 (DQ3*4)
	#define DQ6 (DQ5*2)

	#define WRITE_UNLOCK(addr) { \
	(volatile __u16)(addr + UNLOCK_ADDR1) = (__u16)UNLOCK_CMD1; \
	(volatile __u16)(addr + UNLOCK_ADDR2) = (__u16)UNLOCK_CMD2; \
	}

	#define CONFIG_AM29_RESERVED (0)
	#define K (1024)
	#define MB (4)

	#define CELL_SIZE (64*K)
	#define DEVICE_SIZE (MBKK)
	#define CELLS_PER_DEVICE (DEVICE_SIZE/CELL_SIZE)
	#define RESERVED_CELLS (CONFIG_AM29_RESERVED*K)/CELL_SIZE
	#define MAX_FLASH_DEVICES (1)
	#define AVAIL_SIZE (DEVICE_SIZEMAX_FLASH_DEVICES - RESERVED_CELLSCELL_SIZE)


	flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
	static __u16 toggling_bits;


	/*-----------------------------------------------------------------------
	*/
	ulong flash_get_size (ulong baseaddr, flash_info_t * info)
	{
	short i;
	__u16 flashtest;

	/* Write auto select command sequence and test FLASH answer */
	WRITE_UNLOCK (baseaddr);
	(volatile __u16 ) (baseaddr + ID_ADDR) = (__u16) ID_CMD;
	flashtest /* manufacturer ID / = (volatile __u16 *) (baseaddr);
	(volatile __u16 ) (baseaddr + ID_ADDR) = (__u16) RESET_CMD;

	switch ((__u32) ((flashtest << 16) + flashtest)) {
	case AMD_MANUFACT:
	info->flash_id = FLASH_MAN_AMD & FLASH_VENDMASK;
	break;
	case FUJ_MANUFACT:
	info->flash_id = FLASH_MAN_FUJ & FLASH_VENDMASK;
	break;
	default:
	info->flash_id = FLASH_UNKNOWN;
	info->sector_count = 0;
	info->size = 0;
	return (0); /* no or unknown flash */
	}

	/* Write auto select command sequence and test FLASH answer */
	WRITE_UNLOCK (baseaddr);
	(volatile __u16 ) (baseaddr + ID_ADDR) = (__u16) ID_CMD;
	flashtest /* device ID / = (volatile __u16 *) (baseaddr + 2);
	(volatile __u16 ) (baseaddr + ID_ADDR) = (__u16) RESET_CMD;

	/* toggling_bits = (flashtest == TOSHIBA)?(DQ6):(DQ2\|DQ6); */
	toggling_bits = (DQ2 \| DQ6);

	switch ((__u32) ((flashtest << 16) + flashtest)) {
	case AMD_ID_LV160B:
	info->flash_id +=
	(FLASH_AM160LV \| FLASH_AM160B) & FLASH_TYPEMASK;
	info->sector_count = CONFIG_SYS_MAX_FLASH_SECT;
	info->size = CONFIG_SYS_FLASH_SIZE;
	/* 1*16K Boot Block
	2*8K Parameter Block
	132K Small Main Block /
	info->start[0] = baseaddr;
	info->start[1] = baseaddr + 0x4000;
	info->start[2] = baseaddr + 0x6000;
	info->start[3] = baseaddr + 0x8000;
	for (i = 1; i < info->sector_count; i++)
	info->start[3 + i] = baseaddr + i * CONFIG_SYS_MAIN_SECT_SIZE;
	break;
	default:
	info->flash_id = FLASH_UNKNOWN;
	return (0); /* no or unknown flash */
	}

	for (i = 0; i < info->sector_count; i++) {
	/* Write auto select command sequence and test FLASH answer */
	WRITE_UNLOCK (info->start[i]);
	(volatile __u16 ) (info->start[i] + ID_ADDR) = (__u16) ID_CMD;
	flashtest /* protected verify / = (volatile __u16 *) (info->start[i] + 4);
	(volatile __u16 ) (info->start[i] + ID_ADDR) = (__u16) RESET_CMD;
	if (flashtest & 0x0001) {
	info->protect[i] = 1; /* D0 = 1 if protected */
	} else {
	info->protect[i] = 0;
	}
	}
	return (info->size);
	}

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

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

	/* Static FLASH Bank configuration here (only one bank) */
	size = flash_get_size (CONFIG_SYS_FLASH_BASE, &flash_info[0]);

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

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

	flash_protect (FLAG_PROTECT_SET,
	CONFIG_ENV_ADDR,
	CONFIG_ENV_ADDR + CONFIG_ENV_SIZE - 1, &flash_info[0]);

	return 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_AMD:
	printf ("AMD ");
	break;
	case FLASH_MAN_FUJ:
	printf ("Fujitsu ");
	break;
	default:
	printf ("Unknown Vendor ");
	break;
	}

	switch (info->flash_id & FLASH_TYPEMASK) {
	case FLASH_AMDL323B:
	printf ("29DL323B (32 M, bottom sector)\n");
	break;
	case (FLASH_AM160LV \| FLASH_AM160B):
	printf ("29LV160BE (1M x 16, bottom sector)\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 (" S%02d @ 0x%08lX%s", i,
	info->start[i], info->protect[i] ? " !" : " ");
	}
	printf ("\n");
	return;
	}

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

	for (sect = s_first; sect <= s_last; sect++)
	if (info->protect[sect])
	prot++;
	if (prot)
	printf ("- can't erase %d protected sectors\n", prot);
	return prot;
	}

	/*-----------------------------------------------------------------------
	*/
	int flash_check_erase_amd (ulong start)
	{
	__u16 v1, v2;

	v1 = (volatile __u16 ) (start);
	v2 = (volatile __u16 ) (start);

	if (((v1 ^ v2) & toggling_bits) == toggling_bits) {
	if (((v1 \| v2) & DQ5) == DQ5) {
	printf ("[DQ5] ");
	/* OOPS: exceeded timing limits */

	v1 = (volatile __u16 ) (start);
	v2 = (volatile __u16 ) (start);

	if (((v1 ^ v2) & toggling_bits) == toggling_bits) {

	printf ("[%s] ",
	((toggling_bits & (DQ2 \| DQ6)) ==
	(DQ2 \| DQ6)) ? "DQ2,DQ6" : "DQ6");

	/* OOPS: there is an erasure in progress,
	* try to reset chip */
	(volatile __u16 ) (start) =
	(__u16) RESET_CMD;

	return 1; /* still busy */
	}
	}
	return 1; /* still busy */
	}
	return 0; /* be free */
	}

	/*-----------------------------------------------------------------------
	*/
	int flash_erase (flash_info_t * info, int s_first, int s_last)
	{
	int flag, sect, setup_offset = 0;
	int rc = ERR_OK;

	if (info->flash_id == FLASH_UNKNOWN) {
	printf ("- missing\n");
	return ERR_UNKNOWN_FLASH_TYPE;
	}

	if ((s_first < 0) \|\| (s_first > s_last)) {
	printf ("- no sectors to erase\n");
	return ERR_INVAL;
	}

	if (flash_check_protection (info, s_first, s_last))
	return ERR_PROTECTED;

	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_FUJ:
	case FLASH_MAN_AMD:
	switch (info->flash_id & FLASH_TYPEMASK) {
	case (FLASH_AM160LV \| FLASH_AM160B):
	setup_offset = UNLOCK_ADDR1; /* just the adress for setup_cmd differs */
	case FLASH_AMDL323B:
	/*
	* Disable interrupts which might cause a timeout
	* here. Remember that our exception vectors are
	* at address 0 in the flash, and we don't want a
	* (ticker) exception to happen while the flash
	* chip is in programming mode.
	*/
	flag = disable_interrupts ();
	/* Start erase on unprotected sectors */
	for (sect = s_first; sect <= s_last && !ctrlc ();
	sect++) {
	printf ("Erasing sector %2d ... ", sect);

	if (info->protect[sect] == 0) {
	/* not protected */
	/* Write sector erase command sequence */
	WRITE_UNLOCK (info->start[0]);
	(volatile __u16 ) (info->start[0] +
	setup_offset) =
	(__u16) SETUP_CMD;
	WRITE_UNLOCK (info->start[0]);
	(volatile __u16 ) (info->
	start[sect]) =
	(__u16) SECERASE_CMD;

	/* wait some time */
	reset_timer_masked ();
	while (get_timer_masked () < 1000) {
	}

	/* arm simple, non interrupt dependent timer */
	reset_timer_masked ();
	while (flash_check_erase_amd (info->start[sect])) {
	if (get_timer_masked () > CONFIG_SYS_FLASH_ERASE_TOUT) {
	printf ("timeout!\n");
	/* OOPS: reach timeout,
	* try to reset chip
	*/
	(volatile __u16 ) (info-> start[sect]) = (__u16) RESET_CMD;
	rc = ERR_TIMOUT;
	goto outahere_323B;
	}
	}
	printf ("ok.\n");
	} else {
	printf ("protected!\n");
	}
	}
	if (ctrlc ())
	printf ("User Interrupt!\n");
	outahere_323B:
	/* allow flash to settle - wait 10 ms */
	udelay_masked (10000);
	if (flag)
	enable_interrupts ();
	return rc;
	default:
	printf ("- unknown chip type\n");
	return ERR_UNKNOWN_FLASH_TYPE;
	}
	break;
	default:
	printf ("- unknown vendor ");
	return ERR_UNKNOWN_FLASH_VENDOR;
	}
	}

	/*-----------------------------------------------------------------------
	*/
	int flash_check_write_amd (ulong dest)
	{
	__u16 v1, v2;

	v1 = (volatile __u16 ) (dest);
	v2 = (volatile __u16 ) (dest);

	/* DQ6 toggles during write */
	if (((v1 ^ v2) & DQ6) == DQ6) {
	if (((v1 \| v2) & DQ5) == DQ5) {
	printf ("[DQ5] @ %08lX\n", dest);

	/* OOPS: exceeded timing limits,
	* try to reset chip */
	(volatile __u16 ) (dest) = (__u16) RESET_CMD;
	return 0; /* be free */
	}
	return 1; /* still busy */
	}

	return 0; /* be free */
	}

	/*-----------------------------------------------------------------------
	* Copy memory to flash
	*/
	static int write_word (flash_info_t * info, ulong dest, ushort data)
	{
	int rc = ERR_OK;
	int flag;

	/* Check if Flash is (sufficiently) erased */
	if (((__u16 ) (dest) & data) != data)
	return ERR_NOT_ERASED;

	/*
	* Disable interrupts which might cause a timeout
	* here. Remember that our exception vectors are
	* at address 0 in the flash, and we don't want a
	* (ticker) exception to happen while the flash
	* chip is in programming mode.
	*/
	flag = disable_interrupts ();

	/* Write program command sequence */
	WRITE_UNLOCK (info->start[0]);

	/* Flash dependend program seqence */
	switch (info->flash_id & FLASH_VENDMASK) {
	case FLASH_MAN_FUJ:
	case FLASH_MAN_AMD:
	switch (info->flash_id & FLASH_TYPEMASK) {
	case (FLASH_AM160LV \| FLASH_AM160B):
	(volatile __u16 ) (info->start[0] + UNLOCK_ADDR1) =
	(__u16) PROG_CMD;
	(volatile __u16 ) (dest) = (__u16) data;
	break;
	case FLASH_AMDL323B:
	(volatile __u16 ) (dest) = (__u16) PROG_CMD;
	(volatile __u16 ) (dest) = (__u16) data;
	break;
	}
	}

	/* arm simple, non interrupt dependent timer */
	reset_timer_masked ();

	while (flash_check_write_amd (dest)) {
	if (get_timer_masked () > CONFIG_SYS_FLASH_WRITE_TOUT) {
	printf ("timeout! @ %08lX\n", dest);
	/* OOPS: reach timeout,
	* try to reset chip */
	(volatile __u16 ) (dest) = (__u16) RESET_CMD;

	rc = ERR_TIMOUT;
	goto outahere_323B;
	}
	}

	/* Check if Flash was (accurately) written */
	if ((__u16 ) (dest) != data)
	rc = ERR_PROG_ERROR;

	outahere_323B:
	if (flag)
	enable_interrupts ();
	return rc;
	}

	/*-----------------------------------------------------------------------
	* Copy memory to flash.
	*/
	int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
	{
	ulong cp, wp;
	ushort data;
	int l;
	int i, rc;

	wp = (addr & ~1); /* 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 << 8);
	}
	for (; i < 2 && cnt > 0; ++i) {
	data = (data >> 8) \| (*src++ << 8);
	--cnt;
	++cp;
	}
	for (; cnt == 0 && i < 2; ++i, ++cp) {
	data = (data >> 8) \| ((uchar ) cp << 8);
	}

	if ((rc = write_word (info, wp, data)) != 0) {
	return (rc);
	}
	wp += 2;
	}

	/*
	* handle word aligned part
	*/
	while (cnt >= 2) {
	data = ((ushort ) src);
	if ((rc = write_word (info, wp, data)) != 0)
	return (rc);
	src += 2;
	wp += 2;
	cnt -= 2;
	}

	if (cnt == 0)
	return ERR_OK;

	/*
	* handle unaligned tail bytes
	*/
	data = 0;
	for (i = 0, cp = wp; i < 2 && cnt > 0; ++i, ++cp) {
	data = (data >> 8) \| (*src++ << 8);
	--cnt;
	}
	for (; i < 2; ++i, ++cp) {
	data = (data >> 8) \| ((uchar ) cp << 8);
	}

	return write_word (info, wp, data);
	}