/* * Basic Flash Driver for Freescale MCF 5281/5282 internal FLASH * * (C) Copyright 2005 BuS Elektronik GmbH & Co.KG <esw@bus-elektonik.de> * * 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/m5282.h>#include  "cfm_flash.h"#if defined(CONFIG_M5281) || defined(CONFIG_M5282)#if (CFG_CLK>20000000)	#define CFM_CLK  (((long) CFG_CLK / (400000 * 8) + 1) | 0x40)#else	#define CFM_CLK  ((long) CFG_CLK / 400000 + 1)#endif#define cmf_backdoor_address(addr)	(((addr) & 0x0007FFFF) | 0x04000000 | \					 (CFG_MBAR & 0xC0000000))void cfm_flash_print_info (flash_info_t * info){	printf ("Freescale: ");	switch (info->flash_id & FLASH_TYPEMASK) {	case FREESCALE_ID_MCF5281 & FLASH_TYPEMASK:		printf ("MCF5281 internal FLASH\n");		break;	case FREESCALE_ID_MCF5282 & FLASH_TYPEMASK:		printf ("MCF5282 internal FLASH\n");		break;	default:		printf ("Unknown Chip Type\n");		break;	}}void cfm_flash_init (flash_info_t * info){	int sector;	ulong protection;	MCFCFM_MCR = 0;	MCFCFM_CLKD = CFM_CLK;	debug ("CFM Clock divider: %ld (%d Hz @ %ld Hz)\n",CFM_CLK,\		CFG_CLK / (2* ((CFM_CLK & 0x3F)+1) * (1+((CFM_CLK & 0x40)>>6)*7)),\		CFG_CLK);	MCFCFM_SACC = 0;	MCFCFM_DACC = 0;	if (MCFCFM_SEC & MCFCFM_SEC_KEYEN)		puts("CFM backdoor access is enabled\n");	if (MCFCFM_SEC & MCFCFM_SEC_SECSTAT)		puts("CFM securety is enabled\n");	#ifdef CONFIG_M5281		info->flash_id = (FREESCALE_MANUFACT & FLASH_VENDMASK) |				 (FREESCALE_ID_MCF5281 & FLASH_TYPEMASK);		info->size = 256*1024;		info->sector_count = 16;	#else		info->flash_id = (FREESCALE_MANUFACT & FLASH_VENDMASK) |				 (FREESCALE_ID_MCF5282 & FLASH_TYPEMASK);		info->size = 512*1024;		info->sector_count = 32;	#endif	protection = MCFCFM_PROT;	for (sector = 0; sector < info->sector_count; sector++)	{		if (sector == 0)		{			info->start[sector] = CFG_INT_FLASH_BASE;		}		else		{			info->start[sector] = info->start[sector-1] + 0x04000;		}		info->protect[sector] = protection & 1;		protection >>= 1;	}}int cfm_flash_readycheck(int checkblank){	int	rc;	unsigned char state;	rc	= ERR_OK;	while (!(MCFCFM_USTAT & MCFCFM_USTAT_CCIF));	state = MCFCFM_USTAT;	if (state & MCFCFM_USTAT_ACCERR)	{		debug ("%s(): CFM access error",__FUNCTION__);		rc = ERR_PROG_ERROR;	}	if (state & MCFCFM_USTAT_PVIOL)	{		debug ("%s(): CFM protection violation",__FUNCTION__);		rc = ERR_PROTECTED;	}	if (checkblank)	{		if (!(state & MCFCFM_USTAT_BLANK))		{			debug ("%s(): CFM erras error",__FUNCTION__);			rc = ERR_NOT_ERASED;		}	}	MCFCFM_USTAT = state & 0x34; /* reset state */	return rc;}/* Erase 16KiB = 8 2KiB pages */int cfm_flash_erase_sector (flash_info_t * info, int sector){	ulong address;	int page;	int rc;	rc= ERR_OK;	address = cmf_backdoor_address(info->start[sector]);	for (page=0; (page<8) && (rc==ERR_OK); page++)	{		*(volatile __u32*) address = 0;		MCFCFM_CMD = MCFCFM_CMD_PGERS;		MCFCFM_USTAT = MCFCFM_USTAT_CBEIF;		rc = cfm_flash_readycheck(0);		if (rc==ERR_OK)		{			*(volatile __u32*) address = 0;			MCFCFM_CMD = MCFCFM_CMD_PGERSVER;			MCFCFM_USTAT = MCFCFM_USTAT_CBEIF;			rc = cfm_flash_readycheck(1);		}		address += 0x800;	}	return rc;}int cfm_flash_write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt){	int rc;	ulong dest, data;	rc = ERR_OK;	if (addr & 3)	{		debug ("Byte and Word alignment not supported\n");		rc = ERR_ALIGN;	}	if (cnt & 3)	{		debug ("Byte and Word transfer not supported\n");		rc = ERR_ALIGN;	}	dest = cmf_backdoor_address(addr);	while ((cnt>=4) && (rc == ERR_OK))	{		data =*((volatile u32 *) src);		*(volatile u32*) dest = data;		MCFCFM_CMD = MCFCFM_CMD_PGM;		MCFCFM_USTAT = MCFCFM_USTAT_CBEIF;		rc = cfm_flash_readycheck(0);		if (*(volatile u32*) addr != data) rc = ERR_PROG_ERROR;		src +=4;		dest +=4;		addr +=4;		cnt -=4;	}	return rc;}#ifdef CFG_FLASH_PROTECTIONint cfm_flash_protect(flash_info_t * info,long sector,int prot){	int rc;	rc= ERR_OK;	if (prot)	{		MCFCFM_PROT |= (1<<sector);		info->protect[sector]=1;	}	else	{		MCFCFM_PROT &= ~(1<<sector);		info->protect[sector]=0;	}	return rc;}#endif#endif