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/* Copyright 2013-2015 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <libflash/libffs.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <mtd/mtd-user.h>
#include "pnor.h"
#include "opal-prd.h"
int pnor_init(struct pnor *pnor)
{
int rc, fd;
struct blocklevel_device *bl;
mtd_info_t mtd_info;
if (!pnor)
return -1;
/* Open device and ffs */
fd = open(pnor->path, O_RDWR);
if (fd < 0) {
perror(pnor->path);
return -1;
}
/* Hack so we can test on non-mtd file descriptors */
#if defined(__powerpc__)
rc = ioctl(fd, MEMGETINFO, &mtd_info);
if (rc < 0) {
pr_log(LOG_ERR, "PNOR: ioctl failed to get pnor info: %m");
goto out;
}
pnor->size = mtd_info.size;
pnor->erasesize = mtd_info.erasesize;
#else
pnor->size = lseek(fd, 0, SEEK_END);
if (pnor->size < 0) {
perror(pnor->path);
goto out;
}
/* Fake it */
pnor->erasesize = 1024;
#endif
pr_debug("PNOR: Found PNOR: %d bytes (%d blocks)", pnor->size,
pnor->erasesize);
rc = file_init(fd, &bl);
if (rc) {
pr_log(LOG_ERR, "PNOR: (libflash) file_init() failed");
goto out;
}
rc = ffs_init(0, pnor->size, 0, bl, &pnor->ffsh, 0);
if (rc)
pr_log(LOG_ERR, "PNOR: Failed to open pnor partition table");
file_exit(bl);
out:
close(fd);
return rc;
}
void pnor_close(struct pnor *pnor)
{
if (!pnor)
return;
if (pnor->ffsh)
ffs_close(pnor->ffsh);
if (pnor->path)
free(pnor->path);
}
void dump_parts(struct ffs_handle *ffs) {
int i, rc;
uint32_t start, size, act_size;
char *name;
pr_debug("PNOR: %10s %8s %8s %8s",
"name", "start", "size", "act_size");
for (i = 0; ; i++) {
rc = ffs_part_info(ffs, i, &name, &start,
&size, &act_size, NULL);
if (rc)
break;
pr_debug("PNOR: %10s %08x %08x %08x",
name, start, size, act_size);
free(name);
}
}
static int mtd_write(struct pnor *pnor, int fd, void *data, uint64_t offset,
size_t len)
{
int write_start, write_len, start_waste, rc;
bool end_waste = false;
uint8_t *buf;
struct erase_info_user erase;
if (len > pnor->size || offset > pnor->size ||
len + offset > pnor->size)
return -ERANGE;
start_waste = offset % pnor->erasesize;
write_start = offset - start_waste;
/* Align size to multiple of block size */
write_len = (len + start_waste) & ~(pnor->erasesize - 1);
if ((len + start_waste) > write_len) {
end_waste = true;
write_len += pnor->erasesize;
}
buf = malloc(write_len);
if (start_waste) {
rc = lseek(fd, write_start, SEEK_SET);
if (rc < 0) {
pr_log(LOG_ERR, "PNOR: lseek write_start(0x%x) "
"failed; %m", write_start);
goto out;
}
rc = read(fd, buf, pnor->erasesize);
if (rc < 0) {
pr_log(LOG_ERR, "PNOR: read(0x%x bytes) failed: %m",
pnor->erasesize);
goto out;
}
}
if (end_waste) {
rc = lseek(fd, write_start + write_len - pnor->erasesize,
SEEK_SET);
if (rc < 0) {
perror("lseek last write block");
pr_log(LOG_ERR, "PNOR: lseek last write block(0x%x) "
"failed; %m",
write_start + write_len -
pnor->erasesize);
goto out;
}
rc = read(fd, buf + write_len - pnor->erasesize, pnor->erasesize);
if (rc < 0) {
pr_log(LOG_ERR, "PNOR: read(0x%x bytes) failed: %m",
pnor->erasesize);
goto out;
}
}
/* Put data in the correct spot */
memcpy(buf + start_waste, data, len);
/* Not sure if this is required */
rc = lseek(fd, 0, SEEK_SET);
if (rc < 0) {
pr_log(LOG_NOTICE, "PNOR: lseek(0) failed: %m");
goto out;
}
/* Erase */
erase.start = write_start;
erase.length = write_len;
rc = ioctl(fd, MEMERASE, &erase);
if (rc < 0) {
pr_log(LOG_ERR, "PNOR: erase(start 0x%x, len 0x%x) ioctl "
"failed: %m", write_start, write_len);
goto out;
}
/* Write */
rc = lseek(fd, write_start, SEEK_SET);
if (rc < 0) {
pr_log(LOG_ERR, "PNOR: lseek write_start(0x%x) failed: %m",
write_start);
goto out;
}
rc = write(fd, buf, write_len);
if (rc < 0) {
pr_log(LOG_ERR, "PNOR: write(0x%x bytes) failed: %m",
write_len);
goto out;
}
/* We have succeded, report the requested write size */
rc = len;
out:
free(buf);
return rc;
}
static int mtd_read(struct pnor *pnor, int fd, void *data, uint64_t offset,
size_t len)
{
int read_start, read_len, start_waste, rc;
int mask = pnor->erasesize - 1;
void *buf;
if (len > pnor->size || offset > pnor->size ||
len + offset > pnor->size)
return -ERANGE;
/* Align start to erase block size */
start_waste = offset % pnor->erasesize;
read_start = offset - start_waste;
/* Align size to multiple of block size */
read_len = (len + start_waste) & ~mask;
if ((len + start_waste) > read_len)
read_len += pnor->erasesize;
/* Ensure read is not out of bounds */
if (read_start + read_len > pnor->size) {
pr_log(LOG_ERR, "PNOR: read out of bounds");
return -ERANGE;
}
buf = malloc(read_len);
rc = lseek(fd, read_start, SEEK_SET);
if (rc < 0) {
pr_log(LOG_ERR, "PNOR: lseek read_start(0x%x) failed: %m",
read_start);
goto out;
}
rc = read(fd, buf, read_len);
if (rc < 0) {
pr_log(LOG_ERR, "PNOR: write(offset 0x%x, len 0x%x) "
"failed: %m", read_start, read_len);
goto out;
}
/* Copy data into destination, carefully avoiding the extra data we
* added to align to block size */
memcpy(data, buf + start_waste, len);
rc = len;
out:
free(buf);
return rc;
}
/* Similar to read(2), this performs partial operations where the number of
* bytes read/written may be less than size.
*
* Returns number of bytes written, or a negative value on failure. */
int pnor_operation(struct pnor *pnor, const char *name, uint64_t offset,
void *data, size_t requested_size, enum pnor_op op)
{
int rc, fd;
uint32_t pstart, psize, idx;
int size;
if (!pnor->ffsh) {
pr_log(LOG_ERR, "PNOR: ffs not initialised");
return -EBUSY;
}
rc = ffs_lookup_part(pnor->ffsh, name, &idx);
if (rc) {
pr_log(LOG_WARNING, "PNOR: no partiton named '%s'", name);
return -ENOENT;
}
ffs_part_info(pnor->ffsh, idx, NULL, &pstart, &psize, NULL, NULL);
if (rc) {
pr_log(LOG_ERR, "PNOR: unable to fetch partition info for %s",
name);
return -ENOENT;
}
if (offset > psize) {
pr_log(LOG_WARNING, "PNOR: partition %s(size 0x%x) "
"offset (0x%lx) out of bounds",
name, psize, offset);
return -ERANGE;
}
/* Large requests are trimmed */
if (requested_size > psize)
size = psize;
else
size = requested_size;
if (size + offset > psize)
size = psize - offset;
if (size < 0) {
pr_log(LOG_WARNING, "PNOR: partition %s(size 0x%x) "
"read size (0x%zx) and offset (0x%lx) "
"out of bounds",
name, psize, requested_size, offset);
return -ERANGE;
}
fd = open(pnor->path, O_RDWR);
if (fd < 0) {
perror(pnor->path);
return fd;
}
switch (op) {
case PNOR_OP_READ:
rc = mtd_read(pnor, fd, data, pstart + offset, size);
break;
case PNOR_OP_WRITE:
rc = mtd_write(pnor, fd, data, pstart + offset, size);
break;
default:
rc = -EIO;
pr_log(LOG_ERR, "PNOR: Invalid operation");
goto out;
}
if (rc < 0)
pr_log(LOG_ERR, "PNOR: MTD operation failed");
else if (rc != size)
pr_log(LOG_WARNING, "PNOR: mtd operation "
"returned %d, expected %d",
rc, size);
out:
close(fd);
return rc;
}
|