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authorSimon Arlott <simon@fire.lp0.eu>2015-12-13 22:49:26 +0000
committerBrian Norris <computersforpeace@gmail.com>2016-02-12 10:27:48 -0800
commit436e94a6fbcdca133a2546769db4ac0a84265ad1 (patch)
tree56868d9891e22c144572edff76b6c70d18fd39e5 /drivers/mtd/bcm63xxpart.c
parent94248462f066ec19b9c184ff66300e6e71977609 (diff)
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mtd: bcm63xxpart: Remove dependency on mach-bcm63xx
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>
Diffstat (limited to 'drivers/mtd/bcm63xxpart.c')
-rw-r--r--drivers/mtd/bcm63xxpart.c72
1 files changed, 57 insertions, 15 deletions
diff --git a/drivers/mtd/bcm63xxpart.c b/drivers/mtd/bcm63xxpart.c
index cec3188a170d..1eea8b6bc66a 100644
--- a/drivers/mtd/bcm63xxpart.c
+++ b/drivers/mtd/bcm63xxpart.c
@@ -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;
};