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/*
* 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_PROTECTION
int 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
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