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bcm53xx: update NVRAM driver to support getting contents

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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 45907
This commit is contained in:
Rafał Miłecki 2015-06-05 21:49:57 +00:00
parent fc0776f2c7
commit 48da51ed03
2 changed files with 60 additions and 15 deletions
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60
target/linux/bcm53xx/files/drivers/firmware/broadcom/bcm47xx_nvram.c
View File

@ -94,17 +94,22 @@ static int nvram_find_and_copy(void __iomem *iobase, u32 lim)
return -ENXIO;
found:
if (header->len > size)
pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
if (header->len > NVRAM_SPACE)
pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
header->len, NVRAM_SPACE - 1);
src = (u32 *)header;
dst = (u32 *)nvram_buf;
for (i = 0; i < sizeof(struct nvram_header); i += 4)
*dst++ = __raw_readl(src++);
for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4)
header = (struct nvram_header *)nvram_buf;
if (header->len > size) {
pr_err("The nvram size according to the header seems to be bigger than the partition on flash\n");
header->len = size;
}
if (header->len >= NVRAM_SPACE) {
pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
header->len, NVRAM_SPACE - 1);
header->len = NVRAM_SPACE - 1;
}
/* proceed reading data after header */
for (; i < header->len; i += 4)
*dst++ = readl(src++);
nvram_buf[NVRAM_SPACE - 1] = '\0';
@ -139,6 +144,7 @@ static int nvram_init(void)
#ifdef CONFIG_MTD
struct mtd_info *mtd;
struct nvram_header header;
struct nvram_header *pheader;
size_t bytes_read;
int err;
@ -147,20 +153,21 @@ static int nvram_init(void)
return -ENODEV;
err = mtd_read(mtd, 0, sizeof(header), &bytes_read, (uint8_t *)&header);
if (!err && header.magic == NVRAM_MAGIC) {
u8 *dst = (uint8_t *)nvram_buf;
size_t len = header.len;
if (len >= NVRAM_SPACE) {
len = NVRAM_SPACE - 1;
if (!err && header.magic == NVRAM_MAGIC &&
header.len > sizeof(header)) {
if (header.len >= NVRAM_SPACE) {
pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
header.len, len);
header.len, NVRAM_SPACE);
header.len = NVRAM_SPACE - 1;
}
err = mtd_read(mtd, 0, len, &bytes_read, dst);
err = mtd_read(mtd, 0, header.len, &bytes_read,
(u8 *)nvram_buf);
if (err)
return err;
pheader = (struct nvram_header *)nvram_buf;
pheader->len = header.len;
return 0;
}
#endif
@ -220,4 +227,27 @@ int bcm47xx_nvram_gpio_pin(const char *name)
}
EXPORT_SYMBOL(bcm47xx_nvram_gpio_pin);
char *bcm47xx_nvram_get_contents(size_t *nvram_size)
{
int err;
char *nvram;
struct nvram_header *header;
if (!nvram_buf[0]) {
err = nvram_init();
if (err)
return NULL;
}
header = (struct nvram_header *)nvram_buf;
*nvram_size = header->len - sizeof(struct nvram_header);
nvram = vmalloc(*nvram_size);
if (!nvram)
return NULL;
memcpy(nvram, &nvram_buf[sizeof(struct nvram_header)], *nvram_size);
return nvram;
}
EXPORT_SYMBOL(bcm47xx_nvram_get_contents);
MODULE_LICENSE("GPLv2");

15
target/linux/bcm53xx/files/include/linux/bcm47xx_nvram.h
View File

@ -10,11 +10,17 @@
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/vmalloc.h>
#ifdef CONFIG_BCM47XX_NVRAM
int bcm47xx_nvram_init_from_mem(u32 base, u32 lim);
int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len);
int bcm47xx_nvram_gpio_pin(const char *name);
char *bcm47xx_nvram_get_contents(size_t *val_len);
static inline void bcm47xx_nvram_release_contents(char *nvram)
{
vfree(nvram);
};
#else
static inline int bcm47xx_nvram_init_from_mem(u32 base, u32 lim)
{
@ -29,6 +35,15 @@ static inline int bcm47xx_nvram_gpio_pin(const char *name)
{
return -ENOTSUPP;
};
static inline char *bcm47xx_nvram_get_contents(size_t *val_len)
{
return NULL;
};
static inline void bcm47xx_nvram_release_contents(char *nvram)
{
};
#endif
#endif /* __BCM47XX_NVRAM_H */