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u-boot/board/w7o/flash.c
Wolfgang Denk 77ddac9480 Cleanup for GCC-4.x
2005-10-13 16:45:02 +02:00

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/*
* (C) Copyright 2001
* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
* Based on code by:
* Wolfgang Denk, DENX Software Engineering, wd@denx.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 <ppc4xx.h>
#include <asm/processor.h>
#include <watchdog.h>
flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
/*-----------------------------------------------------------------------
* Functions
*/
static ulong flash_get_size (vu_long *addr, flash_info_t *info);
static int write_word8(flash_info_t *info, ulong dest, ulong data);
static int write_word32 (flash_info_t *info, ulong dest, ulong data);
static void flash_get_offsets (ulong base, flash_info_t *info);
/*-----------------------------------------------------------------------
*/
unsigned long flash_init (void)
{
int i;
unsigned long size_b0, base_b0;
unsigned long size_b1, base_b1;
/* Init: no FLASHes known */
for (i = 0; i < CFG_MAX_FLASH_BANKS; ++i) {
flash_info[i].flash_id = FLASH_UNKNOWN;
}
/* Get Size of Boot and Main Flashes */
size_b0 = flash_get_size((vu_long *)FLASH_BASE0_PRELIM, &flash_info[0]);
if (flash_info[0].flash_id == FLASH_UNKNOWN) {
printf ("## Unknown FLASH on Bank 0 - Size = 0x%08lx = %ld MB\n",
size_b0, size_b0<<20);
return 0;
}
size_b1 = flash_get_size((vu_long *)FLASH_BASE1_PRELIM, &flash_info[1]);
if (flash_info[1].flash_id == FLASH_UNKNOWN) {
printf ("## Unknown FLASH on Bank 1 - Size = 0x%08lx = %ld MB\n",
size_b1, size_b1<<20);
return 0;
}
/* Calculate base addresses */
base_b0 = -size_b0;
base_b1 = -size_b1;
/* Setup offsets for Boot Flash */
flash_get_offsets (base_b0, &flash_info[0]);
/* Protect board level data */
(void)flash_protect(FLAG_PROTECT_SET,
base_b0,
flash_info[0].start[1] - 1,
&flash_info[0]);
/* Monitor protection ON by default */
(void)flash_protect(FLAG_PROTECT_SET,
base_b0 + size_b0 - monitor_flash_len,
base_b0 + size_b0 - 1,
&flash_info[0]);
/* Protect the FPGA image */
(void)flash_protect(FLAG_PROTECT_SET,
FLASH_BASE1_PRELIM,
FLASH_BASE1_PRELIM + CFG_FPGA_IMAGE_LEN - 1,
&flash_info[1]);
/* Protect the default boot image */
(void)flash_protect(FLAG_PROTECT_SET,
FLASH_BASE1_PRELIM + CFG_FPGA_IMAGE_LEN,
FLASH_BASE1_PRELIM + CFG_FPGA_IMAGE_LEN + 0x600000 - 1,
&flash_info[1]);
/* Setup offsets for Main Flash */
flash_get_offsets (FLASH_BASE1_PRELIM, &flash_info[1]);
return (size_b0 + size_b1);
} /* end flash_init() */
/*-----------------------------------------------------------------------
*/
static void flash_get_offsets (ulong base, flash_info_t *info)
{
int i;
/* set up sector start address table - FOR BOOT ROM ONLY!!! */
if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040) {
for (i = 0; i < info->sector_count; i++)
info->start[i] = base + (i * 0x00010000);
}
} /* end flash_get_offsets() */
/*-----------------------------------------------------------------------
*/
void flash_print_info (flash_info_t *info)
{
int i;
int k;
int size;
int erased;
volatile unsigned long *flash;
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 ("1 x AMD "); break;
case FLASH_MAN_STM: printf ("1 x STM "); break;
case FLASH_MAN_INTEL: printf ("2 x Intel "); break;
default: printf ("Unknown Vendor ");
}
switch (info->flash_id & FLASH_TYPEMASK) {
case FLASH_AM040:
if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_AMD)
printf ("AM29LV040 (4096 Kbit, uniform sector size)\n");
else if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_STM)
printf ("M29W040B (4096 Kbit, uniform block size)\n");
else
printf ("UNKNOWN 29x040x (4096 Kbit, uniform sector size)\n");
break;
case FLASH_28F320J3A:
printf ("28F320J3A (32 Mbit = 128K x 32)\n");
break;
case FLASH_28F640J3A:
printf ("28F640J3A (64 Mbit = 128K x 64)\n");
break;
case FLASH_28F128J3A:
printf ("28F128J3A (128 Mbit = 128K x 128)\n");
break;
default:
printf ("Unknown Chip Type\n");
}
if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_STM) {
printf (" Size: %ld KB in %d Blocks\n",
info->size >> 10, info->sector_count);
} else {
printf (" Size: %ld KB in %d Sectors\n",
info->size >> 10, info->sector_count);
}
printf (" Sector Start Addresses:");
for (i=0; i<info->sector_count; ++i) {
/*
* Check if whole sector is erased
*/
if (i != (info->sector_count-1))
size = info->start[i+1] - info->start[i];
else
size = info->start[0] + info->size - info->start[i];
erased = 1;
flash = (volatile unsigned long *)info->start[i];
size = size >> 2; /* divide by 4 for longword access */
for (k=0; k<size; k++)
{
if (*flash++ != 0xffffffff)
{
erased = 0;
break;
}
}
if ((i % 5) == 0)
printf ("\n ");
printf (" %08lX%s%s",
info->start[i],
erased ? " E" : " ",
info->protect[i] ? "RO " : " "
);
}
printf ("\n");
} /* end flash_print_info() */
/*
* The following code cannot be run from FLASH!
*/
static ulong flash_get_size (vu_long *addr, flash_info_t *info)
{
short i;
ulong base = (ulong)addr;
/* Setup default type */
info->flash_id = FLASH_UNKNOWN;
info->sector_count =0;
info->size = 0;
/* Test for Boot Flash */
if (base == FLASH_BASE0_PRELIM) {
unsigned char value;
volatile unsigned char * addr2 = (unsigned char *)addr;
/* Write auto select command: read Manufacturer ID */
*(addr2 + 0x555) = 0xaa;
*(addr2 + 0x2aa) = 0x55;
*(addr2 + 0x555) = 0x90;
/* Manufacture ID */
value = *addr2;
switch (value) {
case (unsigned char)AMD_MANUFACT:
info->flash_id = FLASH_MAN_AMD;
break;
case (unsigned char)STM_MANUFACT:
info->flash_id = FLASH_MAN_STM;
break;
default:
*addr2 = 0xf0; /* no or unknown flash */
return 0;
}
/* Device ID */
value = *(addr2 + 1);
switch (value) {
case (unsigned char)AMD_ID_LV040B:
case (unsigned char)STM_ID_29W040B:
info->flash_id += FLASH_AM040;
info->sector_count = 8;
info->size = 0x00080000;
break; /* => 512Kb */
default:
*addr2 = 0xf0; /* => no or unknown flash */
return 0;
}
}
else { /* MAIN Flash */
unsigned long value;
volatile unsigned long * addr2 = (unsigned long *)addr;
/* Write auto select command: read Manufacturer ID */
*addr2 = 0x90909090;
/* Manufacture ID */
value = *addr2;
switch (value) {
case (unsigned long)INTEL_MANUFACT:
info->flash_id = FLASH_MAN_INTEL;
break;
default:
*addr2 = 0xff; /* no or unknown flash */
return 0;
}
/* Device ID - This shit is interleaved... */
value = *(addr2 + 1);
switch (value) {
case (unsigned long)INTEL_ID_28F320J3A:
info->flash_id += FLASH_28F320J3A;
info->sector_count = 32;
info->size = 0x00400000 * 2;
break; /* => 2 X 4 MB */
case (unsigned long)INTEL_ID_28F640J3A:
info->flash_id += FLASH_28F640J3A;
info->sector_count = 64;
info->size = 0x00800000 * 2;
break; /* => 2 X 8 MB */
case (unsigned long)INTEL_ID_28F128J3A:
info->flash_id += FLASH_28F128J3A;
info->sector_count = 128;
info->size = 0x01000000 * 2;
break; /* => 2 X 16 MB */
default:
*addr2 = 0xff; /* => no or unknown flash */
}
}
/* Make sure we don't exceed CFG_MAX_FLASH_SECT */
if (info->sector_count > CFG_MAX_FLASH_SECT) {
printf ("** ERROR: sector count %d > max (%d) **\n",
info->sector_count, CFG_MAX_FLASH_SECT);
info->sector_count = CFG_MAX_FLASH_SECT;
}
/* set up sector start address table */
switch (info->flash_id & FLASH_TYPEMASK) {
case FLASH_AM040:
for (i = 0; i < info->sector_count; i++)
info->start[i] = base + (i * 0x00010000);
break;
case FLASH_28F320J3A:
case FLASH_28F640J3A:
case FLASH_28F128J3A:
for (i = 0; i < info->sector_count; i++)
info->start[i] = base + (i * 0x00020000 * 2); /* 2 Banks */
break;
}
/* Test for Boot Flash */
if (base == FLASH_BASE0_PRELIM) {
volatile unsigned char *addr2;
/* check for protected sectors */
for (i = 0; i < info->sector_count; i++) {
/* read sector protection at sector address, (AX .. A0) = 0x02 */
/* D0 = 1 if protected */
addr2 = (volatile unsigned char *)(info->start[i]);
info->protect[i] = *(addr2 + 2) & 1;
}
/* Restore read mode */
*(unsigned char *)base = 0xF0; /* Reset NORMAL Flash */
}
else { /* Main Flash */
volatile unsigned long *addr2;
/* check for protected sectors */
for (i = 0; i < info->sector_count; i++) {
/* read sector protection at sector address, (AX .. A0) = 0x02 */
/* D0 = 1 if protected */
addr2 = (volatile unsigned long *)(info->start[i]);
info->protect[i] = *(addr2 + 2) & 0x1;
}
/* Restore read mode */
*(unsigned long *)base = 0xFFFFFFFF; /* Reset Flash */
}
return (info->size);
} /* end flash_get_size() */
/*-----------------------------------------------------------------------
*/
static int wait_for_DQ7(ulong addr, uchar cmp_val, ulong tout)
{
int i;
volatile uchar *vaddr = (uchar *)addr;
/* Loop X times */
for (i = 1; i <= (100 * tout); i++) { /* Wait up to tout ms */
udelay(10);
/* Pause 10 us */
/* Check for completion */
if ((vaddr[0] & 0x80) == (cmp_val & 0x80)) {
return 0;
}
/* KEEP THE LUSER HAPPY - Print a dot every 1.1 seconds */
if (!(i % 110000))
putc('.');
/* Kick the dog if needed */
WATCHDOG_RESET();
}
return 1;
} /* wait_for_DQ7() */
/*-----------------------------------------------------------------------
*/
static int flash_erase8(flash_info_t *info, int s_first, int s_last)
{
int tcode, rcode = 0;
volatile uchar *addr = (uchar *)(info->start[0]);
volatile uchar *sector_addr;
int flag, prot, sect;
/* Validate arguments */
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;
}
/* Check for KNOWN flash type */
if (info->flash_id == FLASH_UNKNOWN) {
printf ("Can't erase unknown flash type - aborted\n");
return 1;
}
/* Check for protected sectors */
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
printf ("\n");
/* Start erase on unprotected sectors */
for (sect = s_first; sect <= s_last; sect++) {
if (info->protect[sect] == 0) { /* not protected */
sector_addr = (uchar *)(info->start[sect]);
if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_STM)
printf("Erasing block %p\n", sector_addr);
else
printf("Erasing sector %p\n", sector_addr);
/* Disable interrupts which might cause Flash to timeout */
flag = disable_interrupts();
*(addr + 0x555) = (uchar)0xAA;
*(addr + 0x2aa) = (uchar)0x55;
*(addr + 0x555) = (uchar)0x80;
*(addr + 0x555) = (uchar)0xAA;
*(addr + 0x2aa) = (uchar)0x55;
*sector_addr = (uchar)0x30; /* sector erase */
/*
* Wait for each sector to complete, it's more
* reliable. According to AMD Spec, you must
* issue all erase commands within a specified
* timeout. This has been seen to fail, especially
* if printf()s are included (for debug)!!
* Takes up to 6 seconds.
*/
tcode = wait_for_DQ7((ulong)sector_addr, 0x80, 6000);
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
/* Make sure we didn't timeout */
if (tcode) {
printf ("Timeout\n");
rcode = 1;
}
}
}
/* wait at least 80us - let's wait 1 ms */
udelay (1000);
/* reset to read mode */
addr = (uchar *)info->start[0];
*addr = (uchar)0xF0; /* reset bank */
printf (" done\n");
return rcode;
} /* end flash_erase8() */
static int flash_erase32(flash_info_t *info, int s_first, int s_last)
{
int flag, sect;
ulong start, now, last;
int prot = 0;
/* Validate arguments */
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;
}
/* Check for KNOWN flash type */
if ((info->flash_id & FLASH_VENDMASK) != FLASH_MAN_INTEL) {
printf ("Can erase only Intel flash types - aborted\n");
return 1;
}
/* Check for protected sectors */
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
printf ("\n");
start = get_timer (0);
last = start;
/* Start erase on unprotected sectors */
for (sect = s_first; sect <= s_last; sect++) {
WATCHDOG_RESET();
if (info->protect[sect] == 0) { /* not protected */
vu_long *addr = (vu_long *)(info->start[sect]);
unsigned long status;
/* Disable interrupts which might cause a timeout here */
flag = disable_interrupts();
*addr = 0x00500050; /* clear status register */
*addr = 0x00200020; /* erase setup */
*addr = 0x00D000D0; /* erase confirm */
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
/* Wait at least 80us - let's wait 1 ms */
udelay (1000);
while (((status = *addr) & 0x00800080) != 0x00800080) {
if ((now = get_timer(start)) > CFG_FLASH_ERASE_TOUT) {
printf ("Timeout\n");
*addr = 0x00B000B0; /* suspend erase */
*addr = 0x00FF00FF; /* reset to read mode */
return 1;
}
/* show that we're waiting */
if ((now - last) > 990) { /* every second */
putc ('.');
last = now;
}
}
*addr = 0x00FF00FF; /* reset to read mode */
}
}
printf (" done\n");
return 0;
} /* end flash_erase32() */
int flash_erase(flash_info_t *info, int s_first, int s_last)
{
if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040)
return flash_erase8(info, s_first, s_last);
else
return flash_erase32(info, s_first, s_last);
} /* end flash_erase() */
/*-----------------------------------------------------------------------
* Copy memory to flash, returns:
* 0 - OK
* 1 - write timeout
* 2 - Flash not erased
*/
static int write_buff8(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
ulong cp, wp, data;
ulong start;
int i, l, rc;
start = get_timer (0);
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_word8(info, wp, data)) != 0) {
return (rc);
}
wp += 4;
}
/*
* handle word aligned part
*/
while (cnt >= 4) {
data = 0;
for (i=0; i<4; ++i) {
data = (data << 8) | *src++;
}
if ((rc = write_word8(info, wp, data)) != 0) {
return (rc);
}
wp += 4;
cnt -= 4;
if (get_timer(start) > 1000) { /* every second */
WATCHDOG_RESET();
putc ('.');
start = get_timer(0);
}
}
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_word8(info, wp, data));
} /* end write_buff8() */
#define FLASH_WIDTH 4 /* flash bus width in bytes */
static int write_buff32 (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
ulong cp, wp, data;
int i, l, rc;
ulong start;
start = get_timer (0);
if (info->flash_id == FLASH_UNKNOWN) {
return 4;
}
wp = (addr & ~(FLASH_WIDTH-1)); /* get lower FLASH_WIDTH 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<FLASH_WIDTH && cnt>0; ++i) {
data = (data << 8) | *src++;
--cnt;
++cp;
}
for (; cnt==0 && i<FLASH_WIDTH; ++i, ++cp) {
data = (data << 8) | (*(uchar *)cp);
}
if ((rc = write_word32(info, wp, data)) != 0) {
return (rc);
}
wp += FLASH_WIDTH;
}
/*
* handle FLASH_WIDTH aligned part
*/
while (cnt >= FLASH_WIDTH) {
data = 0;
for (i=0; i<FLASH_WIDTH; ++i) {
data = (data << 8) | *src++;
}
if ((rc = write_word32(info, wp, data)) != 0) {
return (rc);
}
wp += FLASH_WIDTH;
cnt -= FLASH_WIDTH;
if (get_timer(start) > 990) { /* every second */
putc ('.');
start = get_timer(0);
}
}
if (cnt == 0) {
return (0);
}
/*
* handle unaligned tail bytes
*/
data = 0;
for (i=0, cp=wp; i<FLASH_WIDTH && cnt>0; ++i, ++cp) {
data = (data << 8) | *src++;
--cnt;
}
for (; i<FLASH_WIDTH; ++i, ++cp) {
data = (data << 8) | (*(uchar *)cp);
}
return (write_word32(info, wp, data));
} /* write_buff32() */
int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
int retval;
if ((info->flash_id & FLASH_TYPEMASK) == FLASH_AM040)
retval = write_buff8(info, src, addr, cnt);
else
retval = write_buff32(info, src, addr, cnt);
return retval;
} /* end write_buff() */
/*-----------------------------------------------------------------------
* Write a word to Flash, returns:
* 0 - OK
* 1 - write timeout
* 2 - Flash not erased
*/
static int write_word8(flash_info_t *info, ulong dest, ulong data)
{
volatile uchar *addr2 = (uchar *)(info->start[0]);
volatile uchar *dest2 = (uchar *)dest;
volatile uchar *data2 = (uchar *)&data;
int flag;
int i, tcode, rcode = 0;
/* Check if Flash is (sufficently) erased */
if ((*((volatile uchar *)dest) &
(uchar)data) != (uchar)data) {
return (2);
}
for (i=0; i < (4 / sizeof(uchar)); i++) {
/* Disable interrupts which might cause a timeout here */
flag = disable_interrupts();
*(addr2 + 0x555) = (uchar)0xAA;
*(addr2 + 0x2aa) = (uchar)0x55;
*(addr2 + 0x555) = (uchar)0xA0;
dest2[i] = data2[i];
/* Wait for write to complete, up to 1ms */
tcode = wait_for_DQ7((ulong)&dest2[i], data2[i], 1);
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
/* Make sure we didn't timeout */
if (tcode) {
rcode = 1;
}
}
return rcode;
} /* end write_word8() */
static int write_word32(flash_info_t *info, ulong dest, ulong data)
{
vu_long *addr = (vu_long *)dest;
ulong status;
ulong start;
int flag;
/* Check if Flash is (sufficiently) erased */
if ((*addr & data) != data) {
return (2);
}
/* Disable interrupts which might cause a timeout here */
flag = disable_interrupts();
*addr = 0x00400040; /* write setup */
*addr = data;
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
start = get_timer (0);
while (((status = *addr) & 0x00800080) != 0x00800080) {
WATCHDOG_RESET();
if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
*addr = 0x00FF00FF; /* restore read mode */
return (1);
}
}
*addr = 0x00FF00FF; /* restore read mode */
return (0);
} /* end write_word32() */
static int _flash_protect(flash_info_t *info, long sector)
{
int i;
int flag;
ulong status;
int rcode = 0;
volatile long *addr = (long *)sector;
switch(info->flash_id & FLASH_TYPEMASK) {
case FLASH_28F320J3A:
case FLASH_28F640J3A:
case FLASH_28F128J3A:
/* Disable interrupts which might cause Flash to timeout */
flag = disable_interrupts();
/* Issue command */
*addr = 0x00500050L; /* Clear the status register */
*addr = 0x00600060L; /* Set lock bit setup */
*addr = 0x00010001L; /* Set lock bit confirm */
/* Wait for command completion */
for (i = 0; i < 10; i++) { /* 75us timeout, wait 100us */
udelay(10);
if ((*addr & 0x00800080L) == 0x00800080L)
break;
}
/* Not successful? */
status = *addr;
if (status != 0x00800080L) {
printf("Protect %x sector failed: %x\n",
(uint)sector, (uint)status);
rcode = 1;
}
/* Restore read mode */
*addr = 0x00ff00ffL;
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
break;
case FLASH_AM040: /* No soft sector protection */
break;
}
/* Turn protection on for this sector */
for (i = 0; i < info->sector_count; i++) {
if (info->start[i] == sector) {
info->protect[i] = 1;
break;
}
}
return rcode;
} /* end _flash_protect() */
static int _flash_unprotect(flash_info_t *info, long sector)
{
int i;
int flag;
ulong status;
int rcode = 0;
volatile long *addr = (long *)sector;
switch(info->flash_id & FLASH_TYPEMASK) {
case FLASH_28F320J3A:
case FLASH_28F640J3A:
case FLASH_28F128J3A:
/* Disable interrupts which might cause Flash to timeout */
flag = disable_interrupts();
*addr = 0x00500050L; /* Clear the status register */
*addr = 0x00600060L; /* Clear lock bit setup */
*addr = 0x00D000D0L; /* Clear lock bit confirm */
/* Wait for command completion */
for (i = 0; i < 80 ; i++) { /* 700ms timeout, wait 800 */
udelay(10000); /* Delay 10ms */
if ((*addr & 0x00800080L) == 0x00800080L)
break;
}
/* Not successful? */
status = *addr;
if (status != 0x00800080L) {
printf("Un-protect %x sector failed: %x\n",
(uint)sector, (uint)status);
*addr = 0x00ff00ffL;
rcode = 1;
}
/* restore read mode */
*addr = 0x00ff00ffL;
/* re-enable interrupts if necessary */
if (flag)
enable_interrupts();
break;
case FLASH_AM040: /* No soft sector protection */
break;
}
/*
* Fix Intel's little red wagon. Reprotect
* sectors that were protected before we undid
* protection on a specific sector.
*/
for (i = 0; i < info->sector_count; i++) {
if (info->start[i] != sector) {
if (info->protect[i]) {
if (_flash_protect(info, info->start[i]))
rcode = 1;
}
}
else /* Turn protection off for this sector */
info->protect[i] = 0;
}
return rcode;
} /* end _flash_unprotect() */
int flash_real_protect(flash_info_t *info, long sector, int prot)
{
int rcode;
if (prot)
rcode = _flash_protect(info, info->start[sector]);
else
rcode = _flash_unprotect(info, info->start[sector]);
return rcode;
} /* end flash_real_protect() */
/*-----------------------------------------------------------------------
*/
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