Merge tag 'for-linus-20130301' of git://git.infradead.org/linux-mtd
[linux-3.10.git] / drivers / mtd / bcm47xxpart.c
index 6a11805..63feb75 100644 (file)
 /* 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 */
@@ -59,13 +53,21 @@ static int bcm47xxpart_parse(struct mtd_info *master,
        uint32_t *buf;
        size_t bytes_read;
        uint32_t offset;
-       uint32_t blocksize = 0x10000;
+       uint32_t blocksize = master->erasesize;
        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(BCM47XXPART_BYTES_TO_READ, GFP_KERNEL);
+       buf = kzalloc(max_bytes_to_read, GFP_KERNEL);
 
        /* Parse block by block looking for magics */
        for (offset = 0; offset <= master->size - blocksize;
@@ -80,7 +82,7 @@ static int bcm47xxpart_parse(struct mtd_info *master,
                }
 
                /* Read beginning of the block */
-               if (mtd_read(master, offset, BCM47XXPART_BYTES_TO_READ,
+               if (mtd_read(master, offset, max_bytes_to_read,
                             &bytes_read, (uint8_t *)buf) < 0) {
                        pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
                               offset);
@@ -95,9 +97,16 @@ static int bcm47xxpart_parse(struct mtd_info *master,
                }
 
                /* Standard NVRAM */
-               if (buf[0x000 / 4] == NVRAM_HEADER) {
+               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))) {
                        bcm47xxpart_add_part(&parts[curr_part++], "nvram",
                                             offset, 0);
+                       offset = rounddown(offset, blocksize);
                        continue;
                }
 
@@ -131,6 +140,10 @@ static int bcm47xxpart_parse(struct mtd_info *master,
                if (buf[0x000 / 4] == TRX_MAGIC) {
                        trx = (struct trx_header *)buf;
 
+                       trx_part = curr_part;
+                       bcm47xxpart_add_part(&parts[curr_part++], "firmware",
+                                            offset, 0);
+
                        i = 0;
                        /* We have LZMA loader if offset[2] points to sth */
                        if (trx->offset[2]) {
@@ -154,6 +167,8 @@ static int bcm47xxpart_parse(struct mtd_info *master,
                                             offset + trx->offset[i], 0);
                        i++;
 
+                       last_trx_part = curr_part - 1;
+
                        /*
                         * We have whole TRX scanned, skip to the next part. Use
                         * roundown (not roundup), as the loop will increase
@@ -169,11 +184,15 @@ static int bcm47xxpart_parse(struct mtd_info *master,
         * Assume that partitions end at the beginning of the one they are
         * followed by.
         */
-       for (i = 0; i < curr_part - 1; i++)
-               parts[i].size = parts[i + 1].offset - parts[i].offset;
-       if (curr_part > 0)
-               parts[curr_part - 1].size =
-                               master->size - parts[curr_part - 1].offset;
+       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 (i == last_trx_part && trx_part >= 0)
+                       parts[trx_part].size = next_part_offset -
+                                              parts[trx_part].offset;
+       }
 
        *pparts = parts;
        return curr_part;