mtd: parsers: Move BCM47xx parser

This moves the BCM47xx partition parser down into the
parser subdirectory. No functional change.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Richard Weinberger <richard@nod.at>

1 files changed, 0 insertions, 317 deletions

diff --git a/drivers/mtd/bcm47xxpart.c b/drivers/mtd/bcm47xxpart.c
deleted file mode 100644
index 6012a10f10c8..000000000000
--- a/drivers/mtd/bcm47xxpart.c
+++ /dev/null
@@ -1,317 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * BCM47XX MTD partitioning
- *
- * Copyright © 2012 Rafał Miłecki <zajec5@gmail.com>
- */
-
-#include <linux/bcm47xx_nvram.h>
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/slab.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mtd/partitions.h>
-
-#include <uapi/linux/magic.h>
-
-/*
- * NAND flash on Netgear R6250 was verified to contain 15 partitions.
- * This will result in allocating too big array for some old devices, but the
- * memory will be freed soon anyway (see mtd_device_parse_register).
- */
-#define BCM47XXPART_MAX_PARTS		20
-
-/*
- * Amount of bytes we read when analyzing each block of flash memory.
- * Set it big enough to allow detecting partition and reading important data.
- */
-#define BCM47XXPART_BYTES_TO_READ	0x4e8
-
-/* Magics */
-#define BOARD_DATA_MAGIC		0x5246504D	/* MPFR */
-#define BOARD_DATA_MAGIC2		0xBD0D0BBD
-#define CFE_MAGIC			0x43464531	/* 1EFC */
-#define FACTORY_MAGIC			0x59544346	/* FCTY */
-#define NVRAM_HEADER			0x48534C46	/* FLSH */
-#define POT_MAGIC1			0x54544f50	/* POTT */
-#define POT_MAGIC2			0x504f		/* OP */
-#define ML_MAGIC1			0x39685a42
-#define ML_MAGIC2			0x26594131
-#define TRX_MAGIC			0x30524448
-#define SHSQ_MAGIC			0x71736873	/* shsq (weird ZTE H218N endianness) */
-
-static const char * const trx_types[] = { "trx", NULL };
-
-struct trx_header {
-	uint32_t magic;
-	uint32_t length;
-	uint32_t crc32;
-	uint16_t flags;
-	uint16_t version;
-	uint32_t offset[3];
-} __packed;
-
-static void bcm47xxpart_add_part(struct mtd_partition *part, const char *name,
-				 u64 offset, uint32_t mask_flags)
-{
-	part->name = name;
-	part->offset = offset;
-	part->mask_flags = mask_flags;
-}
-
-/**
- * bcm47xxpart_bootpartition - gets index of TRX partition used by bootloader
- *
- * Some devices may have more than one TRX partition. In such case one of them
- * is the main one and another a failsafe one. Bootloader may fallback to the
- * failsafe firmware if it detects corruption of the main image.
- *
- * This function provides info about currently used TRX partition. It's the one
- * containing kernel started by the bootloader.
- */
-static int bcm47xxpart_bootpartition(void)
-{
-	char buf[4];
-	int bootpartition;
-
-	/* Check CFE environment variable */
-	if (bcm47xx_nvram_getenv("bootpartition", buf, sizeof(buf)) > 0) {
-		if (!kstrtoint(buf, 0, &bootpartition))
-			return bootpartition;
-	}
-
-	return 0;
-}
-
-static int bcm47xxpart_parse(struct mtd_info *master,
-			     const struct mtd_partition **pparts,
-			     struct mtd_part_parser_data *data)
-{
-	struct mtd_partition *parts;
-	uint8_t i, curr_part = 0;
-	uint32_t *buf;
-	size_t bytes_read;
-	uint32_t offset;
-	uint32_t blocksize = master->erasesize;
-	int trx_parts[2]; /* Array with indexes of TRX partitions */
-	int trx_num = 0; /* Number of found TRX partitions */
-	int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
-	int err;
-
-	/*
-	 * Some really old flashes (like AT45DB*) had smaller erasesize-s, but
-	 * partitions were aligned to at least 0x1000 anyway.
-	 */
-	if (blocksize < 0x1000)
-		blocksize = 0x1000;
-
-	/* Alloc */
-	parts = kcalloc(BCM47XXPART_MAX_PARTS, sizeof(struct mtd_partition),
-			GFP_KERNEL);
-	if (!parts)
-		return -ENOMEM;
-
-	buf = kzalloc(BCM47XXPART_BYTES_TO_READ, GFP_KERNEL);
-	if (!buf) {
-		kfree(parts);
-		return -ENOMEM;
-	}
-
-	/* Parse block by block looking for magics */
-	for (offset = 0; offset <= master->size - blocksize;
-	     offset += blocksize) {
-		/* Nothing more in higher memory on BCM47XX (MIPS) */
-		if (IS_ENABLED(CONFIG_BCM47XX) && offset >= 0x2000000)
-			break;
-
-		if (curr_part >= BCM47XXPART_MAX_PARTS) {
-			pr_warn("Reached maximum number of partitions, scanning stopped!\n");
-			break;
-		}
-
-		/* Read beginning of the block */
-		err = mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
-			       &bytes_read, (uint8_t *)buf);
-		if (err && !mtd_is_bitflip(err)) {
-			pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
-			       offset, err);
-			continue;
-		}
-
-		/* Magic or small NVRAM at 0x400 */
-		if ((buf[0x4e0 / 4] == CFE_MAGIC && buf[0x4e4 / 4] == CFE_MAGIC) ||
-		    (buf[0x400 / 4] == NVRAM_HEADER)) {
-			bcm47xxpart_add_part(&parts[curr_part++], "boot",
-					     offset, MTD_WRITEABLE);
-			continue;
-		}
-
-		/*
-		 * board_data starts with board_id which differs across boards,
-		 * but we can use 'MPFR' (hopefully) magic at 0x100
-		 */
-		if (buf[0x100 / 4] == BOARD_DATA_MAGIC) {
-			bcm47xxpart_add_part(&parts[curr_part++], "board_data",
-					     offset, MTD_WRITEABLE);
-			continue;
-		}
-
-		/* Found on Huawei E970 */
-		if (buf[0x000 / 4] == FACTORY_MAGIC) {
-			bcm47xxpart_add_part(&parts[curr_part++], "factory",
-					     offset, MTD_WRITEABLE);
-			continue;
-		}
-
-		/* POT(TOP) */
-		if (buf[0x000 / 4] == POT_MAGIC1 &&
-		    (buf[0x004 / 4] & 0xFFFF) == POT_MAGIC2) {
-			bcm47xxpart_add_part(&parts[curr_part++], "POT", offset,
-					     MTD_WRITEABLE);
-			continue;
-		}
-
-		/* ML */
-		if (buf[0x010 / 4] == ML_MAGIC1 &&
-		    buf[0x014 / 4] == ML_MAGIC2) {
-			bcm47xxpart_add_part(&parts[curr_part++], "ML", offset,
-					     MTD_WRITEABLE);
-			continue;
-		}
-
-		/* TRX */
-		if (buf[0x000 / 4] == TRX_MAGIC) {
-			struct trx_header *trx;
-			uint32_t last_subpart;
-			uint32_t trx_size;
-
-			if (trx_num >= ARRAY_SIZE(trx_parts))
-				pr_warn("No enough space to store another TRX found at 0x%X\n",
-					offset);
-			else
-				trx_parts[trx_num++] = curr_part;
-			bcm47xxpart_add_part(&parts[curr_part++], "firmware",
-					     offset, 0);
-
-			/*
-			 * Try to find TRX size. The "length" field isn't fully
-			 * reliable as it could be decreased to make CRC32 cover
-			 * only part of TRX data. It's commonly used as checksum
-			 * can't cover e.g. ever-changing rootfs partition.
-			 * Use offsets as helpers for assuming min TRX size.
-			 */
-			trx = (struct trx_header *)buf;
-			last_subpart = max3(trx->offset[0], trx->offset[1],
-					    trx->offset[2]);
-			trx_size = max(trx->length, last_subpart + blocksize);
-
-			/*
-			 * Skip the TRX data. Decrease offset by block size as
-			 * the next loop iteration will increase it.
-			 */
-			offset += roundup(trx_size, blocksize) - blocksize;
-			continue;
-		}
-
-		/* Squashfs on devices not using TRX */
-		if (le32_to_cpu(buf[0x000 / 4]) == SQUASHFS_MAGIC ||
-		    buf[0x000 / 4] == SHSQ_MAGIC) {
-			bcm47xxpart_add_part(&parts[curr_part++], "rootfs",
-					     offset, 0);
-			continue;
-		}
-
-		/*
-		 * New (ARM?) devices may have NVRAM in some middle block. Last
-		 * block will be checked later, so skip it.
-		 */
-		if (offset != master->size - blocksize &&
-		    buf[0x000 / 4] == NVRAM_HEADER) {
-			bcm47xxpart_add_part(&parts[curr_part++], "nvram",
-					     offset, 0);
-			continue;
-		}
-
-		/* Read middle of the block */
-		err = mtd_read(master, offset + 0x8000, 0x4, &bytes_read,
-			       (uint8_t *)buf);
-		if (err && !mtd_is_bitflip(err)) {
-			pr_err("mtd_read error while parsing (offset: 0x%X): %d\n",
-			       offset, err);
-			continue;
-		}
-
-		/* Some devices (ex. WNDR3700v3) don't have a standard 'MPFR' */
-		if (buf[0x000 / 4] == BOARD_DATA_MAGIC2) {
-			bcm47xxpart_add_part(&parts[curr_part++], "board_data",
-					     offset, MTD_WRITEABLE);
-			continue;
-		}
-	}
-
-	/* Look for NVRAM at the end of the last block. */
-	for (i = 0; i < ARRAY_SIZE(possible_nvram_sizes); i++) {
-		if (curr_part >= BCM47XXPART_MAX_PARTS) {
-			pr_warn("Reached maximum number of partitions, scanning stopped!\n");
-			break;
-		}
-
-		offset = master->size - possible_nvram_sizes[i];
-		err = mtd_read(master, offset, 0x4, &bytes_read,
-			       (uint8_t *)buf);
-		if (err && !mtd_is_bitflip(err)) {
-			pr_err("mtd_read error while reading (offset 0x%X): %d\n",
-			       offset, err);
-			continue;
-		}
-
-		/* Standard NVRAM */
-		if (buf[0] == NVRAM_HEADER) {
-			bcm47xxpart_add_part(&parts[curr_part++], "nvram",
-					     master->size - blocksize, 0);
-			break;
-		}
-	}
-
-	kfree(buf);
-
-	/*
-	 * Assume that partitions end at the beginning of the one they are
-	 * followed by.
-	 */
-	for (i = 0; i < curr_part; i++) {
-		u64 next_part_offset = (i < curr_part - 1) ?
-				       parts[i + 1].offset : master->size;
-
-		parts[i].size = next_part_offset - parts[i].offset;
-	}
-
-	/* If there was TRX parse it now */
-	for (i = 0; i < trx_num; i++) {
-		struct mtd_partition *trx = &parts[trx_parts[i]];
-
-		if (i == bcm47xxpart_bootpartition())
-			trx->types = trx_types;
-		else
-			trx->name = "failsafe";
-	}
-
-	*pparts = parts;
-	return curr_part;
-};
-
-static const struct of_device_id bcm47xxpart_of_match_table[] = {
-	{ .compatible = "brcm,bcm947xx-cfe-partitions" },
-	{},
-};
-MODULE_DEVICE_TABLE(of, bcm47xxpart_of_match_table);
-
-static struct mtd_part_parser bcm47xxpart_mtd_parser = {
-	.parse_fn = bcm47xxpart_parse,
-	.name = "bcm47xxpart",
-	.of_match_table = bcm47xxpart_of_match_table,
-};
-module_mtd_part_parser(bcm47xxpart_mtd_parser);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("MTD partitioning for BCM47XX flash memories");