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

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/*
* MOUSSE/MPC8240 Board definitions.
* Flash Routines for MOUSSE onboard AMD29LV106DB devices
*
* (C) Copyright 2000
* Marius Groeger <mgroeger@sysgo.de>
* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 1999, by Curt McDowell, 08-06-99, Broadcom Corp.
* (C) Copyright 2001, James Dougherty, 07/18/01, Broadcom Corp.
*
* 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 <mpc8xx.h>
#include <malloc.h>
#include "mousse.h"
#include "flash.h"
int flashLibDebug = 0;
int flashLibInited = 0;
#define OK 0
#define ERROR -1
#define STATUS int
#define PRINTF if (flashLibDebug) printf
#if 0
#define PRIVATE static
#else
#define PRIVATE
#endif
flash_info_t flash_info[CFG_MAX_FLASH_BANKS];
#define SLEEP_DELAY 166
#define FLASH_SECTOR_SIZE (64*1024)
/***********************************************************************
*
* Virtual Flash Devices on Mousse board
*
* These must be kept in sync with the definitions in flashLib.h.
*
***********************************************************************/
PRIVATE flash_dev_t flashDev[] = {
/* Bank 0 sector SA0 (16 kB) */
{ "SA0",FLASH0_BANK, FLASH0_SEG0_START, 1, 14,
FLASH0_VENDOR_ID, FLASH0_DEVICE_ID
},
/* Bank 0 sector SA1 (8 kB) */
{ "SA1", FLASH0_BANK, FLASH0_SEG0_START + 0x4000, 1, 13,
FLASH0_VENDOR_ID, FLASH0_DEVICE_ID
},
/* Bank 0 sector SA2 (8 kB) */
{ "SA2", FLASH0_BANK, FLASH0_SEG0_START + 0x6000, 1, 13,
FLASH0_VENDOR_ID, FLASH0_DEVICE_ID
},
/* Bank 0 sector SA3 is occluded by Mousse I/O devices */
/* Bank 0 sectors SA4-SA18, after Mousse devices up to PLCC (960 kB) */
{ "KERNEL", FLASH0_BANK, FLASH0_SEG1_START, 15, 16,
FLASH0_VENDOR_ID, FLASH0_DEVICE_ID
},
/* Bank 0 sectors SA19-SA26, jumper can occlude this by PLCC (512 kB) */
/* This is where the Kahlua boot vector and boot ROM code resides. */
{ "BOOT",FLASH0_BANK, FLASH0_SEG2_START, 8, 16,
FLASH0_VENDOR_ID, FLASH0_DEVICE_ID
},
/* Bank 0 sectors SA27-SA34 (512 kB) */
{ "RAMDISK",FLASH0_BANK, FLASH0_SEG3_START, 8, 16,
FLASH0_VENDOR_ID, FLASH0_DEVICE_ID
},
};
int flashDevCount = (sizeof (flashDev) / sizeof (flashDev[0]));
#define DEV(no) (&flashDev[no])
#define DEV_NO(dev) ((dev) - flashDev)
/***********************************************************************
*
* Private Flash Routines
*
***********************************************************************/
/*
* The convention is:
*
* "addr" is always the PROM raw address, which is the address of an
* 8-bit quantity for flash 0 and 16-bit quantity for flash 1.
*
* "pos" is always a logical byte position from the PROM beginning.
*/
#define FLASH0_ADDR(dev, addr) \
((unsigned char *) ((dev)->base + (addr)))
#define FLASH0_WRITE(dev, addr, value) \
(*FLASH0_ADDR(dev, addr) = (value))
#define FLASH0_READ(dev, addr) \
(*FLASH0_ADDR(dev, addr))
PRIVATE int flashCheck (flash_dev_t * dev)
{
if (!flashLibInited) {
printf ("flashCheck: flashLib not initialized\n");
return ERROR;
}
if (dev < &flashDev[0] || dev >= &flashDev[flashDevCount]) {
printf ("flashCheck: Bad dev parameter\n");
return ERROR;
}
if (!dev->found) {
printf ("flashCheck: Device %d not available\n", DEV_NO (dev));
return ERROR;
}
return OK;
}
PRIVATE void flashReset (flash_dev_t * dev)
{
PRINTF ("flashReset: dev=%d\n", DEV_NO (dev));
if (dev->bank == FLASH0_BANK) {
FLASH0_WRITE (dev, 0x555, 0xaa);
FLASH0_WRITE (dev, 0xaaa, 0x55);
FLASH0_WRITE (dev, 0x555, 0xf0);
}
udelay (SLEEP_DELAY);
PRINTF ("flashReset: done\n");
}
PRIVATE int flashProbe (flash_dev_t * dev)
{
int rv, deviceID, vendorID;
PRINTF ("flashProbe: dev=%d\n", DEV_NO (dev));
if (dev->bank != FLASH0_BANK) {
rv = ERROR;
goto DONE;
}
FLASH0_WRITE (dev, 0xaaa, 0xaa);
FLASH0_WRITE (dev, 0x555, 0x55);
FLASH0_WRITE (dev, 0xaaa, 0x90);
udelay (SLEEP_DELAY);
vendorID = FLASH0_READ (dev, 0);
deviceID = FLASH0_READ (dev, 2);
FLASH0_WRITE (dev, 0, 0xf0);
PRINTF ("flashProbe: vendor=0x%x device=0x%x\n", vendorID, deviceID);
if (vendorID == dev->vendorID && deviceID == dev->deviceID)
rv = OK;
else
rv = ERROR;
DONE:
PRINTF ("flashProbe: rv=%d\n", rv);
return rv;
}
PRIVATE int flashWait (flash_dev_t * dev, int addr, int expect, int erase)
{
int rv = ERROR;
int i, data;
int polls;
#if 0
PRINTF ("flashWait: dev=%d addr=0x%x expect=0x%x erase=%d\n",
DEV_NO (dev), addr, expect, erase);
#endif
if (dev->bank != FLASH0_BANK) {
rv = ERROR;
goto done;
}
if (erase)
polls = FLASH_ERASE_SECTOR_TIMEOUT; /* Ticks */
else
polls = FLASH_PROGRAM_POLLS; /* Loops */
for (i = 0; i < polls; i++) {
if (erase)
udelay (SLEEP_DELAY);
data = FLASH0_READ (dev, addr);
if (((data ^ expect) & 0x80) == 0) {
rv = OK;
goto done;
}
if (data & 0x20) {
/*
* If the 0x20 bit has come on, it could actually be because
* the operation succeeded, so check the done bit again.
*/
data = FLASH0_READ (dev, addr);
if (((data ^ expect) & 0x80) == 0) {
rv = OK;
goto done;
}
printf ("flashWait: Program error (dev: %d, addr: 0x%x)\n",
DEV_NO (dev), addr);
flashReset (dev);
rv = ERROR;
goto done;
}
}
printf ("flashWait: Timeout %s (dev: %d, addr: 0x%x)\n",
erase ? "erasing sector" : "programming byte",
DEV_NO (dev), addr);
done:
#if 0
PRINTF ("flashWait: rv=%d\n", rv);
#endif
return rv;
}
/***********************************************************************
*
* Public Flash Routines
*
***********************************************************************/
STATUS flashLibInit (void)
{
int i;
PRINTF ("flashLibInit: devices=%d\n", flashDevCount);
for (i = 0; i < flashDevCount; i++) {
flash_dev_t *dev = &flashDev[i];
/*
* For bank 1, probe both without and with byte swappage,
* so that this module works on both old and new Mousse boards.
*/
flashReset (dev);
if (flashProbe (dev) != ERROR)
dev->found = 1;
flashReset (dev);
if (flashProbe (dev) != ERROR)
dev->found = 1;
dev->swap = 0;
if (dev->found) {
PRINTF ("\n FLASH %s[%d]: iobase=0x%x - %d sectors %d KB",
flashDev[i].name, i, flashDev[i].base,
flashDev[i].sectors,
(flashDev[i].sectors * FLASH_SECTOR_SIZE) / 1024);
}
}
flashLibInited = 1;
PRINTF ("flashLibInit: done\n");
return OK;
}
STATUS flashEraseSector (flash_dev_t * dev, int sector)
{
int pos, addr;
PRINTF ("flashErasesector: dev=%d sector=%d\n", DEV_NO (dev), sector);
if (flashCheck (dev) == ERROR)
return ERROR;
if (sector < 0 || sector >= dev->sectors) {
printf ("flashEraseSector: Sector out of range (dev: %d, sector: %d)\n", DEV_NO (dev), sector);
return ERROR;
}
pos = FLASH_SECTOR_POS (dev, sector);
if (dev->bank != FLASH0_BANK) {
return ERROR;
}
addr = pos;
FLASH0_WRITE (dev, 0xaaa, 0xaa);
FLASH0_WRITE (dev, 0x555, 0x55);
FLASH0_WRITE (dev, 0xaaa, 0x80);
FLASH0_WRITE (dev, 0xaaa, 0xaa);
FLASH0_WRITE (dev, 0x555, 0x55);
FLASH0_WRITE (dev, addr, 0x30);
return flashWait (dev, addr, 0xff, 1);
}
/*
* Note: it takes about as long to flash all sectors together with Chip
* Erase as it does to flash them one at a time (about 30 seconds for 2
* MB). Also since we want to be able to treat subsets of sectors as if
* they were complete devices, we don't use Chip Erase.
*/
STATUS flashErase (flash_dev_t * dev)
{
int sector;
PRINTF ("flashErase: dev=%d sectors=%d\n", DEV_NO (dev), dev->sectors);
if (flashCheck (dev) == ERROR)
return ERROR;
for (sector = 0; sector < dev->sectors; sector++) {
if (flashEraseSector (dev, sector) == ERROR)
return ERROR;
}
return OK;
}
/*
* Read and write bytes
*/
STATUS flashRead (flash_dev_t * dev, int pos, char *buf, int len)
{
int addr, words;
PRINTF ("flashRead: dev=%d pos=0x%x buf=0x%x len=0x%x\n",
DEV_NO (dev), pos, (int) buf, len);
if (flashCheck (dev) == ERROR)
return ERROR;
if (pos < 0 || len < 0 || pos + len > FLASH_MAX_POS (dev)) {
printf ("flashRead: Position out of range "
"(dev: %d, pos: 0x%x, len: 0x%x)\n",
DEV_NO (dev), pos, len);
return ERROR;
}
if (len == 0)
return OK;
if (dev->bank == FLASH0_BANK) {
addr = pos;
words = len;
PRINTF ("flashRead: memcpy(0x%x, 0x%x, 0x%x)\n",
(int) buf, (int) FLASH0_ADDR (dev, pos), len);
memcpy (buf, FLASH0_ADDR (dev, addr), words);
}
PRINTF ("flashRead: rv=OK\n");
return OK;
}
STATUS flashWrite (flash_dev_t * dev, int pos, char *buf, int len)
{
int addr, words;
PRINTF ("flashWrite: dev=%d pos=0x%x buf=0x%x len=0x%x\n",
DEV_NO (dev), pos, (int) buf, len);
if (flashCheck (dev) == ERROR)
return ERROR;
if (pos < 0 || len < 0 || pos + len > FLASH_MAX_POS (dev)) {
printf ("flashWrite: Position out of range "
"(dev: %d, pos: 0x%x, len: 0x%x)\n",
DEV_NO (dev), pos, len);
return ERROR;
}
if (len == 0)
return OK;
if (dev->bank == FLASH0_BANK) {
unsigned char tmp;
addr = pos;
words = len;
while (words--) {
tmp = *buf;
if (~FLASH0_READ (dev, addr) & tmp) {
printf ("flashWrite: Attempt to program 0 to 1 "
"(dev: %d, addr: 0x%x, data: 0x%x)\n",
DEV_NO (dev), addr, tmp);
return ERROR;
}
FLASH0_WRITE (dev, 0xaaa, 0xaa);
FLASH0_WRITE (dev, 0x555, 0x55);
FLASH0_WRITE (dev, 0xaaa, 0xa0);
FLASH0_WRITE (dev, addr, tmp);
if (flashWait (dev, addr, tmp, 0) < 0)
return ERROR;
buf++;
addr++;
}
}
PRINTF ("flashWrite: rv=OK\n");
return OK;
}
/*
* flashWritable returns TRUE if a range contains all F's.
*/
STATUS flashWritable (flash_dev_t * dev, int pos, int len)
{
int addr, words;
int rv = ERROR;
PRINTF ("flashWritable: dev=%d pos=0x%x len=0x%x\n",
DEV_NO (dev), pos, len);
if (flashCheck (dev) == ERROR)
goto done;
if (pos < 0 || len < 0 || pos + len > FLASH_MAX_POS (dev)) {
printf ("flashWritable: Position out of range "
"(dev: %d, pos: 0x%x, len: 0x%x)\n",
DEV_NO (dev), pos, len);
goto done;
}
if (len == 0) {
rv = 1;
goto done;
}
if (dev->bank == FLASH0_BANK) {
addr = pos;
words = len;
while (words--) {
if (FLASH0_READ (dev, addr) != 0xff) {
rv = 0;
goto done;
}
addr++;
}
}
rv = 1;
done:
PRINTF ("flashWrite: rv=%d\n", rv);
return rv;
}
/*
* NOTE: the below code cannot run from FLASH!!!
*/
/***********************************************************************
*
* Flash Diagnostics
*
***********************************************************************/
STATUS flashDiag (flash_dev_t * dev)
{
unsigned int *buf = 0;
int i, len, sector;
int rv = ERROR;
if (flashCheck (dev) == ERROR)
return ERROR;
printf ("flashDiag: Testing device %d, "
"base: 0x%x, %d sectors @ %d kB = %d kB\n",
DEV_NO (dev), dev->base,
dev->sectors,
1 << (dev->lgSectorSize - 10),
dev->sectors << (dev->lgSectorSize - 10));
len = 1 << dev->lgSectorSize;
printf ("flashDiag: Erasing\n");
if (flashErase (dev) == ERROR) {
printf ("flashDiag: Erase failed\n");
goto done;
}
printf ("%d bytes requested ...\n", len);
buf = malloc (len);
printf ("allocated %d bytes ...\n", len);
if (buf == 0) {
printf ("flashDiag: Out of memory\n");
goto done;
}
/*
* Write unique counting pattern to each sector
*/
for (sector = 0; sector < dev->sectors; sector++) {
printf ("flashDiag: Write sector %d\n", sector);
for (i = 0; i < len / 4; i++)
buf[i] = sector << 24 | i;
if (flashWrite (dev,
sector << dev->lgSectorSize,
(char *) buf, len) == ERROR) {
printf ("flashDiag: Write failed (dev: %d, sector: %d)\n",
DEV_NO (dev), sector);
goto done;
}
}
/*
* Verify
*/
for (sector = 0; sector < dev->sectors; sector++) {
printf ("flashDiag: Verify sector %d\n", sector);
if (flashRead (dev,
sector << dev->lgSectorSize,
(char *) buf, len) == ERROR) {
printf ("flashDiag: Read failed (dev: %d, sector: %d)\n",
DEV_NO (dev), sector);
goto done;
}
for (i = 0; i < len / 4; i++) {
if (buf[i] != (sector << 24 | i)) {
printf ("flashDiag: Verify error "
"(dev: %d, sector: %d, offset: 0x%x)\n",
DEV_NO (dev), sector, i);
printf ("flashDiag: Expected 0x%08x, got 0x%08x\n",
sector << 24 | i, buf[i]);
goto done;
}
}
}
printf ("flashDiag: Erasing\n");
if (flashErase (dev) == ERROR) {
printf ("flashDiag: Final erase failed\n");
goto done;
}
rv = OK;
done:
if (buf)
free (buf);
if (rv == OK)
printf ("flashDiag: Device %d passed\n", DEV_NO (dev));
else
printf ("flashDiag: Device %d failed\n", DEV_NO (dev));
return rv;
}
STATUS flashDiagAll (void)
{
int i;
int rv = OK;
PRINTF ("flashDiagAll: devices=%d\n", flashDevCount);
for (i = 0; i < flashDevCount; i++) {
flash_dev_t *dev = &flashDev[i];
if (dev->found && flashDiag (dev) == ERROR)
rv = ERROR;
}
if (rv == OK)
printf ("flashDiagAll: Passed\n");
else
printf ("flashDiagAll: Failed because of earlier errors\n");
return OK;
}
/*-----------------------------------------------------------------------
*/
unsigned long flash_init (void)
{
unsigned long size = 0;
flash_dev_t *dev = NULL;
flashLibInit ();
/*
* Provide info for FLASH (up to 960K) of Kernel Image data.
*/
dev = FLASH_DEV_BANK0_LOW;
flash_info[FLASH_BANK_KERNEL].flash_id =
(dev->vendorID << 16) | dev->deviceID;
flash_info[FLASH_BANK_KERNEL].sector_count = dev->sectors;
flash_info[FLASH_BANK_KERNEL].size =
flash_info[FLASH_BANK_KERNEL].sector_count * FLASH_SECTOR_SIZE;
flash_info[FLASH_BANK_KERNEL].start[FIRST_SECTOR] = dev->base;
size += flash_info[FLASH_BANK_KERNEL].size;
/*
* Provide info for 512K PLCC FLASH ROM (U-Boot)
*/
dev = FLASH_DEV_BANK0_BOOT;
flash_info[FLASH_BANK_BOOT].flash_id =
(dev->vendorID << 16) | dev->deviceID;
flash_info[FLASH_BANK_BOOT].sector_count = dev->sectors;
flash_info[FLASH_BANK_BOOT].size =
flash_info[FLASH_BANK_BOOT].sector_count * FLASH_SECTOR_SIZE;
flash_info[FLASH_BANK_BOOT].start[FIRST_SECTOR] = dev->base;
size += flash_info[FLASH_BANK_BOOT].size;
/*
* Provide info for 512K FLASH0 segment (U-Boot)
*/
dev = FLASH_DEV_BANK0_HIGH;
flash_info[FLASH_BANK_AUX].flash_id =
(dev->vendorID << 16) | dev->deviceID;
flash_info[FLASH_BANK_AUX].sector_count = dev->sectors;
flash_info[FLASH_BANK_AUX].size =
flash_info[FLASH_BANK_AUX].sector_count * FLASH_SECTOR_SIZE;
flash_info[FLASH_BANK_AUX].start[FIRST_SECTOR] = dev->base;
size += flash_info[FLASH_BANK_AUX].size;
return size;
}
/*
* Get flash device from U-Boot flash info.
*/
flash_dev_t *getFlashDevFromInfo (flash_info_t * info)
{
int i;
if (!info)
return NULL;
for (i = 0; i < flashDevCount; i++) {
flash_dev_t *dev = &flashDev[i];
if (dev->found && (dev->base == info->start[0]))
return dev;
}
printf ("ERROR: notice, no FLASH mapped at address 0x%x\n",
(unsigned int) info->start[0]);
return NULL;
}
ulong flash_get_size (vu_long * addr, flash_info_t * info)
{
int i;
for (i = 0; i < flashDevCount; i++) {
flash_dev_t *dev = &flashDev[i];
if (dev->found) {
if (dev->base == (unsigned int) addr) {
info->flash_id = (dev->vendorID << 16) | dev->deviceID;
info->sector_count = dev->sectors;
info->size = info->sector_count * FLASH_SECTOR_SIZE;
return dev->sectors * FLASH_SECTOR_SIZE;
}
}
}
return 0;
}
void flash_print_info (flash_info_t * info)
{
int i;
unsigned int chip;
if (info->flash_id == FLASH_UNKNOWN) {
printf ("missing or unknown FLASH type\n");
return;
}
switch ((info->flash_id >> 16) & 0xff) {
case 0x1:
printf ("AMD ");
break;
default:
printf ("Unknown Vendor ");
break;
}
chip = (unsigned int) info->flash_id & 0x000000ff;
switch (chip) {
case AMD_ID_F040B:
printf ("AM29F040B (4 Mbit)\n");
break;
case AMD_ID_LV160B:
case FLASH_AM160LV:
case 0x49:
printf ("AM29LV160B (16 Mbit / 2M x 8bit)\n");
break;
default:
printf ("Unknown Chip Type:0x%x\n", chip);
break;
}
printf (" Size: %ld bytes in %d Sectors\n",
info->size, 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[FIRST_SECTOR] + i * FLASH_SECTOR_SIZE,
info->protect[i] ? " (RO)" : " ");
}
printf ("\n");
}
/*
* Erase a range of flash sectors.
*/
int flash_erase (flash_info_t * info, int s_first, int s_last)
{
vu_long *addr = (vu_long *) (info->start[0]);
int prot, sect, l_sect;
flash_dev_t *dev = NULL;
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;
}
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");
}
l_sect = -1;
/* Start erase on unprotected sectors */
dev = getFlashDevFromInfo (info);
if (dev) {
printf ("Erase FLASH[%s] -%d sectors:", dev->name, dev->sectors);
for (sect = s_first; sect <= s_last; sect++) {
if (info->protect[sect] == 0) { /* not protected */
addr = (vu_long *) (dev->base);
/* printf("erase_sector: sector=%d, addr=0x%x\n",
sect, addr); */
printf (".");
if (ERROR == flashEraseSector (dev, sect)) {
printf ("ERROR: could not erase sector %d on FLASH[%s]\n", sect, dev->name);
return 1;
}
}
}
}
printf (" done\n");
return 0;
}
/*-----------------------------------------------------------------------
* Write a word to Flash, returns:
* 0 - OK
* 1 - write timeout
* 2 - Flash not erased
*/
static int write_word (flash_info_t * info, ulong dest, ulong data)
{
flash_dev_t *dev = getFlashDevFromInfo (info);
int addr = dest - info->start[0];
if (!dev)
return 1;
if (OK != flashWrite (dev, addr, (char *) &data, sizeof (ulong))) {
printf ("ERROR: could not write to addr=0x%x, data=0x%x\n",
(unsigned int) addr, (unsigned) data);
return 1;
}
if ((addr % FLASH_SECTOR_SIZE) == 0)
printf (".");
PRINTF ("write_word:0x%x, base=0x%x, addr=0x%x, data=0x%x\n",
(unsigned) info->start[0],
(unsigned) dest,
(unsigned) (dest - info->start[0]), (unsigned) data);
return (0);
}
/*-----------------------------------------------------------------------
* Copy memory to flash, returns:
* 0 - OK
* 1 - write timeout
* 2 - Flash not erased
*/
int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
{
ulong cp, wp, data;
int i, l, rc;
flash_dev_t *dev = getFlashDevFromInfo (info);
if (dev) {
printf ("FLASH[%s]:", dev->name);
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_word (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_word (info, wp, data)) != 0) {
return (rc);
}
wp += 4;
cnt -= 4;
}
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_word (info, wp, data));
}
return 1;
}
/*-----------------------------------------------------------------------
*/
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