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mtd: bcm63xxpart: Remove dependency on mach-bcm63xx

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Read nvram directly from flash instead of using the in-memory copy that
mach-bcm63xx has, to remove the dependency on mach-bcm63xx and allow the
parser to work on bmips too.

Rename remaining BCM63XX defines to BCM963XX as these are properties of
the flash layout on the board.

BCM963XX_DEFAULT_PSI_SIZE changes from SZ_64K to 64 because it will be
multiplied by SZ_1K later on.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Simon Arlott 2015-12-13 22:49:26 +00:00 committed by Brian Norris
parent 94248462f0
commit 436e94a6fb
2 changed files with 58 additions and 16 deletions
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2
drivers/mtd/Kconfig
View file

@ -142,7 +142,7 @@ config MTD_AR7_PARTS
config MTD_BCM63XX_PARTS
tristate "BCM63XX CFE partitioning support"
depends on BCM63XX
depends on BCM63XX || BMIPS_GENERIC || COMPILE_TEST
select CRC32
help
This provides partions parsing for BCM63xx devices with CFE

72
drivers/mtd/bcm63xxpart.c
View file

@ -24,6 +24,7 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bcm963xx_nvram.h>
#include <linux/bcm963xx_tag.h>
#include <linux/crc32.h>
#include <linux/module.h>
@ -34,12 +35,11 @@
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <asm/mach-bcm63xx/bcm63xx_nvram.h>
#include <asm/mach-bcm63xx/board_bcm963xx.h>
#define BCM963XX_CFE_BLOCK_SIZE SZ_64K /* always at least 64KiB */
#define BCM63XX_CFE_BLOCK_SIZE SZ_64K /* always at least 64KiB */
#define BCM63XX_CFE_MAGIC_OFFSET 0x4e0
#define BCM963XX_CFE_MAGIC_OFFSET 0x4e0
#define BCM963XX_CFE_VERSION_OFFSET 0x570
#define BCM963XX_NVRAM_OFFSET 0x580
static int bcm63xx_detect_cfe(struct mtd_info *master)
{
@ -58,20 +58,45 @@ static int bcm63xx_detect_cfe(struct mtd_info *master)
return 0;
/* very old CFE's do not have the cfe-v string, so check for magic */
ret = mtd_read(master, BCM63XX_CFE_MAGIC_OFFSET, 8, &retlen,
ret = mtd_read(master, BCM963XX_CFE_MAGIC_OFFSET, 8, &retlen,
(void *)buf);
buf[retlen] = 0;
return strncmp("CFE1CFE1", buf, 8);
}
static int bcm63xx_read_nvram(struct mtd_info *master,
struct bcm963xx_nvram *nvram)
{
u32 actual_crc, expected_crc;
size_t retlen;
int ret;
/* extract nvram data */
ret = mtd_read(master, BCM963XX_NVRAM_OFFSET, BCM963XX_NVRAM_V5_SIZE,
&retlen, (void *)nvram);
if (ret)
return ret;
ret = bcm963xx_nvram_checksum(nvram, &expected_crc, &actual_crc);
if (ret)
pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n",
expected_crc, actual_crc);
if (!nvram->psi_size)
nvram->psi_size = BCM963XX_DEFAULT_PSI_SIZE;
return 0;
}
static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
const struct mtd_partition **pparts,
struct mtd_part_parser_data *data)
{
/* CFE, NVRAM and global Linux are always present */
int nrparts = 3, curpart = 0;
struct bcm_tag *buf;
struct bcm963xx_nvram *nvram = NULL;
struct bcm_tag *buf = NULL;
struct mtd_partition *parts;
int ret;
size_t retlen;
@ -86,25 +111,35 @@ static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
if (bcm63xx_detect_cfe(master))
return -EINVAL;
nvram = vzalloc(sizeof(*nvram));
if (!nvram)
return -ENOMEM;
ret = bcm63xx_read_nvram(master, nvram);
if (ret)
goto out;
cfe_erasesize = max_t(uint32_t, master->erasesize,
BCM63XX_CFE_BLOCK_SIZE);
BCM963XX_CFE_BLOCK_SIZE);
cfelen = cfe_erasesize;
nvramlen = bcm63xx_nvram_get_psi_size() * SZ_1K;
nvramlen = nvram->psi_size * SZ_1K;
nvramlen = roundup(nvramlen, cfe_erasesize);
/* Allocate memory for buffer */
buf = vmalloc(sizeof(struct bcm_tag));
if (!buf)
return -ENOMEM;
if (!buf) {
ret = -ENOMEM;
goto out;
}
/* Get the tag */
ret = mtd_read(master, cfelen, sizeof(struct bcm_tag), &retlen,
(void *)buf);
if (retlen != sizeof(struct bcm_tag)) {
vfree(buf);
return -EIO;
ret = -EIO;
goto out;
}
computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf,
@ -154,8 +189,8 @@ static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
/* Ask kernel for more memory */
parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
if (!parts) {
vfree(buf);
return -ENOMEM;
ret = -ENOMEM;
goto out;
}
/* Start building partition list */
@ -206,8 +241,15 @@ static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
sparelen);
*pparts = parts;
ret = 0;
out:
vfree(nvram);
vfree(buf);
if (ret)
return ret;
return nrparts;
};