Commit 436e94a6 authored by Simon Arlott's avatar Simon Arlott Committed by Brian Norris
Browse files

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: default avatarSimon Arlott <simon@fire.lp0.eu>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 94248462

drivers/mtd/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -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

drivers/mtd/bcm63xxpart.c

+57 −15
Original line number Diff line number Diff line
@@ -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;

};

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