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uboot-1.1.4-kirkwood/board/pm520/flash.c
Olaf Rempel f69754bccc u-boot 1.1.4
2024-01-07 23:57:24 +01:00

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/*
* (C) Copyright 2001
* Kyle Harris, Nexus Technologies, Inc. kharris@nexus-tech.net
*
* (C) Copyright 2001-2004
* 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 <linux/byteorder/swab.h>
flash_info_t flash_info[CFG_MAX_FLASH_BANKS]; /* info for FLASH chips */
/* Board support for 1 or 2 flash devices */
#define FLASH_PORT_WIDTH32
#undef FLASH_PORT_WIDTH16
#ifdef FLASH_PORT_WIDTH16
#define FLASH_PORT_WIDTH ushort
#define FLASH_PORT_WIDTHV vu_short
#define SWAP(x) (x)
#else
#define FLASH_PORT_WIDTH ulong
#define FLASH_PORT_WIDTHV vu_long
#define SWAP(x) (x)
#endif
/* Intel-compatible flash ID */
#define INTEL_COMPAT 0x00890089
#define INTEL_ALT 0x00B000B0
/* Intel-compatible flash commands */
#define INTEL_PROGRAM 0x00100010
#define INTEL_ERASE 0x00200020
#define INTEL_CLEAR 0x00500050
#define INTEL_LOCKBIT 0x00600060
#define INTEL_PROTECT 0x00010001
#define INTEL_STATUS 0x00700070
#define INTEL_READID 0x00900090
#define INTEL_CONFIRM 0x00D000D0
#define INTEL_RESET 0xFFFFFFFF
/* Intel-compatible flash status bits */
#define INTEL_FINISHED 0x00800080
#define INTEL_OK 0x00800080
#define FPW FLASH_PORT_WIDTH
#define FPWV FLASH_PORT_WIDTHV
#define mb() __asm__ __volatile__ ("" : : : "memory")
/*-----------------------------------------------------------------------
* Functions
*/
static ulong flash_get_size (FPW *addr, flash_info_t *info);
static int write_data (flash_info_t *info, ulong dest, FPW data);
static void flash_get_offsets (ulong base, flash_info_t *info);
void inline spin_wheel (void);
static void flash_sync_real_protect (flash_info_t * info);
static unsigned char intel_sector_protected (flash_info_t *info, ushort sector);
/*-----------------------------------------------------------------------
*/
unsigned long flash_init (void)
{
int i;
ulong size = 0;
extern void flash_preinit(void);
extern void flash_afterinit(ulong, ulong);
ulong flashbase = CFG_FLASH_BASE;
flash_preinit();
for (i = 0; i < CFG_MAX_FLASH_BANKS; i++) {
switch (i) {
case 0:
memset(&flash_info[i], 0, sizeof(flash_info_t));
flash_get_size ((FPW *) flashbase, &flash_info[i]);
flash_get_offsets (flash_info[i].start[0], &flash_info[i]);
break;
default:
panic ("configured to many flash banks!\n");
break;
}
size += flash_info[i].size;
/* get the h/w and s/w protection status in sync */
flash_sync_real_protect(&flash_info[i]);
}
/* Protect monitor and environment sectors
*/
#if CFG_MONITOR_BASE >= CFG_FLASH_BASE
#ifndef CONFIG_BOOT_ROM
flash_protect ( FLAG_PROTECT_SET,
CFG_MONITOR_BASE,
CFG_MONITOR_BASE + monitor_flash_len - 1,
&flash_info[0] );
#endif
#endif
#ifdef CFG_ENV_IS_IN_FLASH
flash_protect ( FLAG_PROTECT_SET,
CFG_ENV_ADDR,
CFG_ENV_ADDR + CFG_ENV_SIZE - 1, &flash_info[0] );
#endif
flash_afterinit(flash_info[0].start[0], flash_info[0].size);
return size;
}
/*-----------------------------------------------------------------------
*/
static void flash_get_offsets (ulong base, flash_info_t *info)
{
int i;
if (info->flash_id == FLASH_UNKNOWN) {
return;
}
if ((info->flash_id & FLASH_VENDMASK) == FLASH_MAN_INTEL) {
for (i = 0; i < info->sector_count; i++) {
info->start[i] = base + (i * PHYS_FLASH_SECT_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_INTEL:
printf ("INTEL ");
break;
default:
printf ("Unknown Vendor ");
break;
}
switch (info->flash_id & FLASH_TYPEMASK) {
case FLASH_28F128J3A:
printf ("28F128J3A\n");
break;
case FLASH_28F640J3A:
printf ("28F640J3A\n");
break;
case FLASH_28F320J3A:
printf ("28F320J3A\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 % 5) == 0)
printf ("\n ");
printf (" %08lX%s",
info->start[i],
info->protect[i] ? " (RO)" : " ");
}
printf ("\n");
return;
}
/*
* The following code cannot be run from FLASH!
*/
static ulong flash_get_size (FPW *addr, flash_info_t *info)
{
volatile FPW value;
/* Write auto select command: read Manufacturer ID */
addr[0x5555] = (FPW) 0x00AA00AA;
addr[0x2AAA] = (FPW) 0x00550055;
addr[0x5555] = (FPW) 0x00900090;
mb ();
udelay(100);
value = addr[0];
switch (value) {
case (FPW) INTEL_MANUFACT:
info->flash_id = FLASH_MAN_INTEL;
break;
default:
info->flash_id = FLASH_UNKNOWN;
info->sector_count = 0;
info->size = 0;
addr[0] = (FPW) 0x00FF00FF; /* restore read mode */
return (0); /* no or unknown flash */
}
mb ();
value = addr[1]; /* device ID */
switch (value) {
case (FPW) INTEL_ID_28F128J3A:
info->flash_id += FLASH_28F128J3A;
info->sector_count = 128;
info->size = 0x02000000;
info->start[0] = CFG_FLASH_BASE;
break; /* => 32 MB */
case (FPW) INTEL_ID_28F640J3A:
info->flash_id += FLASH_28F640J3A;
info->sector_count = 64;
info->size = 0x01000000;
info->start[0] = CFG_FLASH_BASE + 0x01000000;
break; /* => 16 MB */
case (FPW) INTEL_ID_28F320J3A:
info->flash_id += FLASH_28F320J3A;
info->sector_count = 32;
info->size = 0x800000;
info->start[0] = CFG_FLASH_BASE + 0x01800000;
break; /* => 8 MB */
default:
info->flash_id = FLASH_UNKNOWN;
break;
}
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;
}
addr[0] = (FPW) 0x00FF00FF; /* restore read mode */
return (info->size);
}
/*
* This function gets the u-boot flash sector protection status
* (flash_info_t.protect[]) in sync with the sector protection
* status stored in hardware.
*/
static void flash_sync_real_protect (flash_info_t * info)
{
int i;
switch (info->flash_id & FLASH_TYPEMASK) {
case FLASH_28F128J3A:
case FLASH_28F640J3A:
case FLASH_28F320J3A:
for (i = 0; i < info->sector_count; ++i) {
info->protect[i] = intel_sector_protected(info, i);
}
break;
default:
/* no h/w protect support */
break;
}
}
/*
* checks if "sector" in bank "info" is protected. Should work on intel
* strata flash chips 28FxxxJ3x in 8-bit mode.
* Returns 1 if sector is protected (or timed-out while trying to read
* protection status), 0 if it is not.
*/
static unsigned char intel_sector_protected (flash_info_t *info, ushort sector)
{
FPWV *addr;
FPWV *lock_conf_addr;
ulong start;
unsigned char ret;
/*
* first, wait for the WSM to be finished. The rationale for
* waiting for the WSM to become idle for at most
* CFG_FLASH_ERASE_TOUT is as follows. The WSM can be busy
* because of: (1) erase, (2) program or (3) lock bit
* configuration. So we just wait for the longest timeout of
* the (1)-(3), i.e. the erase timeout.
*/
/* wait at least 35ns (W12) before issuing Read Status Register */
udelay(1);
addr = (FPWV *) info->start[sector];
*addr = (FPW) INTEL_STATUS;
start = get_timer (0);
while ((*addr & (FPW) INTEL_FINISHED) != (FPW) INTEL_FINISHED) {
if (get_timer (start) > CFG_FLASH_ERASE_TOUT) {
*addr = (FPW) INTEL_RESET; /* restore read mode */
printf("WSM busy too long, can't get prot status\n");
return 1;
}
}
/* issue the Read Identifier Codes command */
*addr = (FPW) INTEL_READID;
/* wait at least 35ns (W12) before reading */
udelay(1);
/* Intel example code uses offset of 2 for 16 bit flash */
lock_conf_addr = (FPWV *) info->start[sector] + 2;
ret = (*lock_conf_addr & (FPW) INTEL_PROTECT) ? 1 : 0;
/* put flash back in read mode */
*addr = (FPW) INTEL_RESET;
return ret;
}
/*-----------------------------------------------------------------------
*/
int flash_erase (flash_info_t *info, int s_first, int s_last)
{
int flag, prot, sect;
ulong type, start, last;
int rcode = 0;
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;
}
type = (info->flash_id & FLASH_VENDMASK);
if ((type != FLASH_MAN_INTEL)) {
printf ("Can't erase unknown flash type %08lx - 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 sectors will not be erased!\n",
prot);
} else {
printf ("\n");
}
start = get_timer (0);
last = start;
/* Disable interrupts which might cause a timeout here */
flag = disable_interrupts ();
/* Start erase on unprotected sectors */
for (sect = s_first; sect <= s_last; sect++) {
if (info->protect[sect] == 0) { /* not protected */
FPWV *addr = (FPWV *) (info->start[sect]);
FPW status;
printf ("Erasing sector %2d ... ", sect);
/* arm simple, non interrupt dependent timer */
start = get_timer(0);
*addr = (FPW) 0x00500050; /* clear status register */
*addr = (FPW) 0x00200020; /* erase setup */
*addr = (FPW) 0x00D000D0; /* erase confirm */
while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
if (get_timer(start) > CFG_FLASH_ERASE_TOUT) {
printf ("Timeout\n");
*addr = (FPW) 0x00B000B0; /* suspend erase */
*addr = (FPW) 0x00FF00FF; /* reset to read mode */
rcode = 1;
break;
}
}
*addr = 0x00500050; /* clear status register cmd. */
*addr = 0x00FF00FF; /* resest to read mode */
printf (" done\n");
}
}
return rcode;
}
/*-----------------------------------------------------------------------
* Copy memory to flash, returns:
* 0 - OK
* 1 - write timeout
* 2 - Flash not erased
* 4 - Flash not identified
*/
int write_buff (flash_info_t *info, uchar *src, ulong addr, ulong cnt)
{
ulong cp, wp;
FPW data;
int count, i, l, rc, port_width;
if (info->flash_id == FLASH_UNKNOWN) {
return 4;
}
/* get lower word aligned address */
#ifdef FLASH_PORT_WIDTH16
wp = (addr & ~1);
port_width = 2;
#else
wp = (addr & ~3);
port_width = 4;
#endif
/*
* 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 < port_width && cnt > 0; ++i) {
data = (data << 8) | *src++;
--cnt;
++cp;
}
for (; cnt == 0 && i < port_width; ++i, ++cp) {
data = (data << 8) | (*(uchar *) cp);
}
if ((rc = write_data (info, wp, SWAP (data))) != 0) {
return (rc);
}
wp += port_width;
}
/*
* handle word aligned part
*/
count = 0;
while (cnt >= port_width) {
data = 0;
for (i = 0; i < port_width; ++i) {
data = (data << 8) | *src++;
}
if ((rc = write_data (info, wp, SWAP (data))) != 0) {
return (rc);
}
wp += port_width;
cnt -= port_width;
if (count++ > 0x800) {
spin_wheel ();
count = 0;
}
}
if (cnt == 0) {
return (0);
}
/*
* handle unaligned tail bytes
*/
data = 0;
for (i = 0, cp = wp; i < port_width && cnt > 0; ++i, ++cp) {
data = (data << 8) | *src++;
--cnt;
}
for (; i < port_width; ++i, ++cp) {
data = (data << 8) | (*(uchar *) cp);
}
return (write_data (info, wp, SWAP (data)));
}
/*-----------------------------------------------------------------------
* Write a word or halfword to Flash, returns:
* 0 - OK
* 1 - write timeout
* 2 - Flash not erased
*/
static int write_data (flash_info_t *info, ulong dest, FPW data)
{
FPWV *addr = (FPWV *) dest;
ulong status;
ulong start;
int flag;
/* Check if Flash is (sufficiently) erased */
if ((*addr & data) != data) {
printf ("not erased at %08lx (%lx)\n", (ulong) addr, *addr);
return (2);
}
/* Disable interrupts which might cause a timeout here */
flag = disable_interrupts ();
*addr = (FPW) 0x00400040; /* write setup */
*addr = data;
/* arm simple, non interrupt dependent timer */
start = get_timer(0);
/* wait while polling the status register */
while (((status = *addr) & (FPW) 0x00800080) != (FPW) 0x00800080) {
if (get_timer(start) > CFG_FLASH_WRITE_TOUT) {
*addr = (FPW) 0x00FF00FF; /* restore read mode */
return (1);
}
}
*addr = (FPW) 0x00FF00FF; /* restore read mode */
return (0);
}
void inline spin_wheel (void)
{
static int p = 0;
static char w[] = "\\/-";
printf ("\010%c", w[p]);
(++p == 3) ? (p = 0) : 0;
}
/*-----------------------------------------------------------------------
* Set/Clear sector's lock bit, returns:
* 0 - OK
* 1 - Error (timeout, voltage problems, etc.)
*/
int flash_real_protect (flash_info_t *info, long sector, int prot)
{
ulong start;
int i;
int rc = 0;
vu_long *addr = (vu_long *)(info->start[sector]);
int flag = disable_interrupts();
*addr = INTEL_CLEAR; /* Clear status register */
if (prot) { /* Set sector lock bit */
*addr = INTEL_LOCKBIT; /* Sector lock bit */
*addr = INTEL_PROTECT; /* set */
}
else { /* Clear sector lock bit */
*addr = INTEL_LOCKBIT; /* All sectors lock bits */
*addr = INTEL_CONFIRM; /* clear */
}
start = get_timer(0);
while ((*addr & INTEL_FINISHED) != INTEL_FINISHED) {
if (get_timer(start) > CFG_FLASH_UNLOCK_TOUT) {
printf("Flash lock bit operation timed out\n");
rc = 1;
break;
}
}
if (*addr != INTEL_OK) {
printf("Flash lock bit operation failed at %08X, CSR=%08X\n",
(uint)addr, (uint)*addr);
rc = 1;
}
if (!rc)
info->protect[sector] = prot;
/*
* Clear lock bit command clears all sectors lock bits, so
* we have to restore lock bits of protected sectors.
* WARNING: code below re-locks sectors only for one bank (info).
* This causes problems on boards where several banks share
* the same chip, as sectors in othere banks will be unlocked
* but not re-locked. It works fine on pm520 though, as there
* is only one chip and one bank.
*/
if (!prot)
{
for (i = 0; i < info->sector_count; i++)
{
if (info->protect[i])
{
start = get_timer(0);
addr = (vu_long *)(info->start[i]);
*addr = INTEL_LOCKBIT; /* Sector lock bit */
*addr = INTEL_PROTECT; /* set */
while ((*addr & INTEL_FINISHED) != INTEL_FINISHED)
{
if (get_timer(start) > CFG_FLASH_UNLOCK_TOUT)
{
printf("Flash lock bit operation timed out\n");
rc = 1;
break;
}
}
}
}
/*
* get the s/w sector protection status in sync with the h/w,
* in case something went wrong during the re-locking.
*/
flash_sync_real_protect(info); /* resets flash to read mode */
}
if (flag)
enable_interrupts();
*addr = INTEL_RESET; /* Reset to read array mode */
return rc;
}
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