brcm47xx: add some more partition parser fixes by Rafał Miłecki

SVN-Revision: 35912

target/linux/brcm47xx/patches-3.8/024-Revert-mtd-bcm47xxpart-improve-probing-of-nvram-part.patch

+--- a/drivers/mtd/bcm47xxpart.c
++++ b/drivers/mtd/bcm47xxpart.c
+@@ -19,6 +19,12 @@
+ /* 10 parts were found on sflash on Netgear WNDR4500 */
+ #define BCM47XXPART_MAX_PARTS		12
+ 
++/*
++ * 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	0x404
++
+ /* Magics */
+ #define BOARD_DATA_MAGIC		0x5246504D	/* MPFR */
+ #define POT_MAGIC1			0x54544f50	/* POTT */
+@@ -57,17 +63,14 @@ static int bcm47xxpart_parse(struct mtd_
+ 	struct trx_header *trx;
+ 	int trx_part = -1;
+ 	int last_trx_part = -1;
+-	int max_bytes_to_read = 0x8004;
+ 
+ 	if (blocksize <= 0x10000)
+ 		blocksize = 0x10000;
+-	if (blocksize == 0x20000)
+-		max_bytes_to_read = 0x18004;
+ 
+ 	/* Alloc */
+ 	parts = kzalloc(sizeof(struct mtd_partition) * BCM47XXPART_MAX_PARTS,
+ 			GFP_KERNEL);
+-	buf = kzalloc(max_bytes_to_read, GFP_KERNEL);
++	buf = kzalloc(BCM47XXPART_BYTES_TO_READ, GFP_KERNEL);
+ 
+ 	/* Parse block by block looking for magics */
+ 	for (offset = 0; offset <= master->size - blocksize;
+@@ -82,7 +85,7 @@ static int bcm47xxpart_parse(struct mtd_
+ 		}
+ 
+ 		/* Read beginning of the block */
+-		if (mtd_read(master, offset, max_bytes_to_read,
++		if (mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
+ 			     &bytes_read, (uint8_t *)buf) < 0) {
+ 			pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
+ 			       offset);
+@@ -97,16 +100,9 @@ static int bcm47xxpart_parse(struct mtd_
+ 		}
+ 
+ 		/* Standard NVRAM */
+-		if (buf[0x000 / 4] == NVRAM_HEADER ||
+-		    buf[0x1000 / 4] == NVRAM_HEADER ||
+-		    buf[0x8000 / 4] == NVRAM_HEADER ||
+-		    (blocksize == 0x20000 && (
+-		      buf[0x10000 / 4] == NVRAM_HEADER ||
+-		      buf[0x11000 / 4] == NVRAM_HEADER ||
+-		      buf[0x18000 / 4] == NVRAM_HEADER))) {
++		if (buf[0x000 / 4] == NVRAM_HEADER) {
+ 			bcm47xxpart_add_part(&parts[curr_part++], "nvram",
+ 					     offset, 0);
+-			offset = rounddown(offset, blocksize);
+ 			continue;
+ 		}
+ 

target/linux/brcm47xx/patches-3.8/025-mtd-bcm47xxpart-look-for-NVRAM-at-the-end-of-device.patch

+--- a/drivers/mtd/bcm47xxpart.c
++++ b/drivers/mtd/bcm47xxpart.c
+@@ -63,6 +63,7 @@ static int bcm47xxpart_parse(struct mtd_
+ 	struct trx_header *trx;
+ 	int trx_part = -1;
+ 	int last_trx_part = -1;
++	int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
+ 
+ 	if (blocksize <= 0x10000)
+ 		blocksize = 0x10000;
+@@ -99,13 +100,6 @@ static int bcm47xxpart_parse(struct mtd_
+ 			continue;
+ 		}
+ 
+-		/* Standard NVRAM */
+-		if (buf[0x000 / 4] == NVRAM_HEADER) {
+-			bcm47xxpart_add_part(&parts[curr_part++], "nvram",
+-					     offset, 0);
+-			continue;
+-		}
+-
+ 		/*
+ 		 * board_data starts with board_id which differs across boards,
+ 		 * but we can use 'MPFR' (hopefully) magic at 0x100
+@@ -174,6 +168,30 @@ static int bcm47xxpart_parse(struct mtd_
+ 			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];
++		if (mtd_read(master, offset, 0x4, &bytes_read,
++			     (uint8_t *)buf) < 0) {
++			pr_err("mtd_read error while reading at offset 0x%X!\n",
++			       offset);
++			continue;
++		}
++
++		/* Standard NVRAM */
++		if (buf[0] == NVRAM_HEADER) {
++			bcm47xxpart_add_part(&parts[curr_part++], "nvram",
++					     master->size - blocksize, 0);
++			break;
++		}
++	}
++
+ 	kfree(buf);
+ 
+ 	/*

target/linux/brcm47xx/patches-3.8/026-mtd-bcm47xxpart-find-boot-partition-by-CFE-magic.patch

+--- a/drivers/mtd/bcm47xxpart.c
++++ b/drivers/mtd/bcm47xxpart.c
+@@ -23,9 +23,10 @@
+  * 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	0x404
++#define BCM47XXPART_BYTES_TO_READ	0x4e8
+ 
+ /* Magics */
++#define CFE_MAGIC			0x43464531	/* 1EFC */
+ #define BOARD_DATA_MAGIC		0x5246504D	/* MPFR */
+ #define POT_MAGIC1			0x54544f50	/* POTT */
+ #define POT_MAGIC2			0x504f		/* OP */
+@@ -93,8 +94,9 @@ static int bcm47xxpart_parse(struct mtd_
+ 			continue;
+ 		}
+ 
+-		/* CFE has small NVRAM at 0x400 */
+-		if (buf[0x400 / 4] == NVRAM_HEADER) {
++		/* Magic or small NVRAM at 0x400 */
++		if (buf[0x4e0 / 4] == CFE_MAGIC ||
++		    buf[0x400 / 4] == NVRAM_HEADER) {
+ 			bcm47xxpart_add_part(&parts[curr_part++], "boot",
+ 					     offset, MTD_WRITEABLE);
+ 			continue;

target/linux/brcm47xx/patches-3.8/024-mtd-bcm47xxpart-get-nvram.patch → target/linux/brcm47xx/patches-3.8/027-mtd-bcm47xxpart-get-nvram.patch

 --- a/drivers/mtd/bcm47xxpart.c
 +++ b/drivers/mtd/bcm47xxpart.c
-@@ -58,6 +58,7 @@ static int bcm47xxpart_parse(struct mtd_
+@@ -65,6 +65,7 @@ static int bcm47xxpart_parse(struct mtd_
  	int trx_part = -1;
  	int last_trx_part = -1;
- 	int max_bytes_to_read = 0x8004;
+ 	int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
 +	bool found_nvram = false;
  
  	if (blocksize <= 0x10000)
  		blocksize = 0x10000;
-@@ -107,6 +108,7 @@ static int bcm47xxpart_parse(struct mtd_
+@@ -190,12 +191,23 @@ static int bcm47xxpart_parse(struct mtd_
+ 		if (buf[0] == NVRAM_HEADER) {
  			bcm47xxpart_add_part(&parts[curr_part++], "nvram",
- 					     offset, 0);
- 			offset = rounddown(offset, blocksize);
+ 					     master->size - blocksize, 0);
 +			found_nvram = true;
- 			continue;
+ 			break;
  		}
- 
-@@ -194,6 +196,15 @@ static int bcm47xxpart_parse(struct mtd_
- 					       parts[trx_part].offset;
  	}
  
+ 	kfree(buf);
+ 
 +	if (!found_nvram) {
 +		pr_err("can not find a nvram partition reserve last block\n");
 +		bcm47xxpart_add_part(&parts[curr_part++], "nvram_guess",
-+				     master->size - blocksize, MTD_WRITEABLE);
++				     master->size - blocksize * 2, MTD_WRITEABLE);
 +		for (i = 0; i < curr_part; i++) {
 +			if (parts[i].size + parts[i].offset == master->size)
-+				parts[i].offset -= blocksize;
++				parts[i].offset -= blocksize * 2;
 +		}
 +	}
- 	*pparts = parts;
- 	return curr_part;
- };
++
+ 	/*
+ 	 * Assume that partitions end at the beginning of the one they are
+ 	 * followed by.