target/linux/brcm63xx/patches-3.7/436-MTD-bcm63xxpart-allow-passing-a-caldata-offset.patch

   1 From: Jonas Gorski <jogo@openwrt.org>
   2 Subject: [PATCH] Allow bcm63xxpart to receive a caldata offset if calibration data is
   3 contained in flash.
   4 ---
   5  drivers/mtd/bcm63xxpart.c      |   51 ++++++++++++++++++++++++++++++++++++---
   6  include/linux/mtd/partitions.h |    2 +
   7  2 files changed, 49 insertions(+), 4 deletions(-)
   8
   9 --- a/drivers/mtd/bcm63xxpart.c
  10 +++ b/drivers/mtd/bcm63xxpart.c
  11 @@ -76,10 +76,12 @@ static int bcm63xx_parse_cfe_partitions(
  12         struct mtd_partition *parts;
  13         int ret;
  14         size_t retlen;
  15 -       unsigned int rootfsaddr, kerneladdr, spareaddr;
  16 +       unsigned int rootfsaddr, kerneladdr, spareaddr, nvramaddr;
  17         unsigned int rootfslen, kernellen, sparelen, totallen;
  18         unsigned int cfelen, nvramlen;
  19         unsigned int cfe_erasesize;
  20 +       unsigned int caldatalen1 = 0, caldataaddr1 = 0;
  21 +       unsigned int caldatalen2 = 0, caldataaddr2 = 0;
  22         int i;
  23         u32 computed_crc;
  24         bool rootfs_first = false;
  25 @@ -93,6 +95,24 @@ static int bcm63xx_parse_cfe_partitions(
  26         cfelen = cfe_erasesize;
  27         nvramlen = bcm63xx_nvram_get_psi_size() * 1024;
  28         nvramlen = roundup(nvramlen, cfe_erasesize);
  29 +       nvramaddr = master->size - nvramlen;
  30 +
  31 +       if (data) {
  32 +               if (data->caldata[0]) {
  33 +                       caldatalen1 = cfe_erasesize;
  34 +                       caldataaddr1 = rounddown(data->caldata[0],
  35 +                                                cfe_erasesize);
  36 +               }
  37 +               if (data->caldata[1]) {
  38 +                       caldatalen2 = cfe_erasesize;
  39 +                       caldataaddr2 = rounddown(data->caldata[1],
  40 +                                                cfe_erasesize);
  41 +               }
  42 +               if (caldataaddr1 == caldataaddr2) {
  43 +                       caldataaddr2 = 0;
  44 +                       caldatalen2 = 0;
  45 +               }
  46 +       }
  47
  48         /* Allocate memory for buffer */
  49         buf = vmalloc(sizeof(struct bcm_tag));
  50 @@ -144,7 +164,7 @@ static int bcm63xx_parse_cfe_partitions(
  51                 rootfsaddr = 0;
  52                 spareaddr = cfelen;
  53         }
  54 -       sparelen = master->size - spareaddr - nvramlen;
  55 +       sparelen = min_not_zero(nvramaddr, caldataaddr1) - spareaddr;
  56
  57         /* Determine number of partitions */
  58         if (rootfslen > 0)
  59 @@ -153,6 +173,12 @@ static int bcm63xx_parse_cfe_partitions(
  60         if (kernellen > 0)
  61                 nrparts++;
  62
  63 +       if (caldatalen1 > 0)
  64 +               nrparts++;
  65 +
  66 +       if (caldatalen2 > 0)
  67 +               nrparts++;
  68 +
  69         /* Ask kernel for more memory */
  70         parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
  71         if (!parts) {
  72 @@ -190,15 +216,32 @@ static int bcm63xx_parse_cfe_partitions(
  73                 curpart++;
  74         }
  75
  76 +       if (caldatalen1 > 0) {
  77 +               if (caldatalen2 > 0)
  78 +                       parts[curpart].name = "cal_data1";
  79 +               else
  80 +                       parts[curpart].name = "cal_data";
  81 +               parts[curpart].offset = caldataaddr1;
  82 +               parts[curpart].size = caldatalen1;
  83 +               curpart++;
  84 +       }
  85 +
  86 +       if (caldatalen2 > 0) {
  87 +               parts[curpart].name = "cal_data2";
  88 +               parts[curpart].offset = caldataaddr2;
  89 +               parts[curpart].size = caldatalen2;
  90 +               curpart++;
  91 +       }
  92 +
  93         parts[curpart].name = "nvram";
  94 -       parts[curpart].offset = master->size - nvramlen;
  95 +       parts[curpart].offset = nvramaddr;
  96         parts[curpart].size = nvramlen;
  97         curpart++;
  98
  99         /* Global partition "linux" to make easy firmware upgrade */
 100         parts[curpart].name = "linux";
 101         parts[curpart].offset = cfelen;
 102 -       parts[curpart].size = master->size - cfelen - nvramlen;
 103 +       parts[curpart].size = min_not_zero(nvramaddr, caldataaddr1) - cfelen;
 104
 105         for (i = 0; i < nrparts; i++)
 106                 pr_info("Partition %d is %s offset %llx and length %llx\n", i,
 107 --- a/include/linux/mtd/partitions.h
 108 +++ b/include/linux/mtd/partitions.h
 109 @@ -58,10 +58,12 @@ struct device_node;
 110  /**
 111   * struct mtd_part_parser_data - used to pass data to MTD partition parsers.
 112   * @origin: for RedBoot, start address of MTD device
 113 + * @caldata: for CFE, start address of wifi calibration data
 114   * @of_node: for OF parsers, device node containing partitioning information
 115   */
 116  struct mtd_part_parser_data {
 117         unsigned long origin;
 118 +       unsigned long caldata[2];
 119         struct device_node *of_node;
 120  };
 121