target/linux/sunxi/patches-4.1/122-mtd-nand-sunxi-add-partition-support.patch

   1 From 5cb31780791d0f6b68e3712f1b35f1a28c47add0 Mon Sep 17 00:00:00 2001
   2 From: Boris Brezillon <boris.brezillon@free-electrons.com>
   3 Date: Tue, 21 Oct 2014 14:37:15 +0200
   4 Subject: [PATCH] mtd: nand: sunxi: Add NAND partition support
   5
   6 Add NAND partition support to the sunxi_nand driver.
   7
   8 Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
   9 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  10 ---
  11  drivers/mtd/nand/Kconfig      |  1 +
  12  drivers/mtd/nand/sunxi_nand.c | 73 +++++++++++++++++++++++++++++++++++++------
  13  2 files changed, 65 insertions(+), 9 deletions(-)
  14
  15 diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
  16 index 8242470..7df88c6 100644
  17 --- a/drivers/mtd/nand/Kconfig
  18 +++ b/drivers/mtd/nand/Kconfig
  19 @@ -525,6 +525,7 @@ config MTD_NAND_XWAY
  20  config MTD_NAND_SUNXI
  21         tristate "Support for NAND on Allwinner SoCs"
  22         depends on ARCH_SUNXI
  23 +       select MTD_OF_NAND_PARTS
  24         help
  25           Enables support for NAND Flash chips on Allwinner SoCs.
  26
  27 diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
  28 index 6f93b29..c3e0473 100644
  29 --- a/drivers/mtd/nand/sunxi_nand.c
  30 +++ b/drivers/mtd/nand/sunxi_nand.c
  31 @@ -202,6 +202,23 @@ struct sunxi_nand_hw_ecc {
  32  };
  33
  34  /*
  35 + * sunxi NAND partition structure: stores NAND partitions information
  36 + *
  37 + * @part: base paritition structure
  38 + * @ecc: per-partition ECC info
  39 + */
  40 +struct sunxi_nand_part {
  41 +       struct nand_part part;
  42 +       struct nand_ecc_ctrl ecc;
  43 +};
  44 +
  45 +static inline struct sunxi_nand_part *
  46 +to_sunxi_nand_part(struct nand_part *part)
  47 +{
  48 +       return container_of(part, struct sunxi_nand_part, part);
  49 +}
  50 +
  51 +/*
  52   * NAND chip structure: stores NAND chip device related information
  53   *
  54   * @node:              used to store NAND chips into a list
  55 @@ -521,7 +538,7 @@ static int sunxi_nfc_hw_ecc_read_page(struct mtd_info *mtd,
  56                                       int oob_required, int page)
  57  {
  58         struct sunxi_nfc *nfc = to_sunxi_nfc(chip->controller);
  59 -       struct nand_ecc_ctrl *ecc = &chip->ecc;
  60 +       struct nand_ecc_ctrl *ecc = chip->cur_ecc;
  61         struct nand_ecclayout *layout = ecc->layout;
  62         struct sunxi_nand_hw_ecc *data = ecc->priv;
  63         unsigned int max_bitflips = 0;
  64 @@ -607,7 +624,7 @@ static int sunxi_nfc_hw_ecc_write_page(struct mtd_info *mtd,
  65                                        const uint8_t *buf, int oob_required)
  66  {
  67         struct sunxi_nfc *nfc = to_sunxi_nfc(chip->controller);
  68 -       struct nand_ecc_ctrl *ecc = &chip->ecc;
  69 +       struct nand_ecc_ctrl *ecc = chip->cur_ecc;
  70         struct nand_ecclayout *layout = ecc->layout;
  71         struct sunxi_nand_hw_ecc *data = ecc->priv;
  72         int offset;
  73 @@ -681,7 +698,7 @@ static int sunxi_nfc_hw_syndrome_ecc_read_page(struct mtd_info *mtd,
  74                                                int page)
  75  {
  76         struct sunxi_nfc *nfc = to_sunxi_nfc(chip->controller);
  77 -       struct nand_ecc_ctrl *ecc = &chip->ecc;
  78 +       struct nand_ecc_ctrl *ecc = chip->cur_ecc;
  79         struct sunxi_nand_hw_ecc *data = ecc->priv;
  80         unsigned int max_bitflips = 0;
  81         uint8_t *oob = chip->oob_poi;
  82 @@ -749,7 +766,7 @@ static int sunxi_nfc_hw_syndrome_ecc_write_page(struct mtd_info *mtd,
  83                                                 int oob_required)
  84  {
  85         struct sunxi_nfc *nfc = to_sunxi_nfc(chip->controller);
  86 -       struct nand_ecc_ctrl *ecc = &chip->ecc;
  87 +       struct nand_ecc_ctrl *ecc = chip->cur_ecc;
  88         struct sunxi_nand_hw_ecc *data = ecc->priv;
  89         uint8_t *oob = chip->oob_poi;
  90         int offset = 0;
  91 @@ -1099,8 +1116,13 @@ static int sunxi_nand_ecc_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc,
  92                 ecc->strength = nand->ecc_strength_ds;
  93         }
  94
  95 -       if (!ecc->size || !ecc->strength)
  96 -               return -EINVAL;
  97 +       if (!ecc->size || !ecc->strength) {
  98 +               if (ecc == &nand->ecc)
  99 +                       return -EINVAL;
 100 +
 101 +               ecc->size = nand->ecc.size;
 102 +               ecc->strength = nand->ecc.strength;
 103 +       }
 104
 105         ecc->mode = NAND_ECC_HW;
 106
 107 @@ -1135,12 +1157,39 @@ static int sunxi_nand_ecc_init(struct mtd_info *mtd, struct nand_ecc_ctrl *ecc,
 108         return 0;
 109  }
 110
 111 +static void sunxi_nand_part_release(struct nand_part *part)
 112 +{
 113 +       kfree(to_sunxi_nand_part(part));
 114 +}
 115 +
 116 +struct nand_part *sunxi_ofnandpart_parse(void *priv, struct mtd_info *master,
 117 +                                        struct device_node *pp)
 118 +{
 119 +       struct sunxi_nand_part *part;
 120 +       int ret;
 121 +
 122 +       part = kzalloc(sizeof(*part), GFP_KERNEL);
 123 +       part->part.release = sunxi_nand_part_release;
 124 +
 125 +       ret = sunxi_nand_ecc_init(master, &part->ecc, pp);
 126 +       if (ret)
 127 +               goto err;
 128 +
 129 +       part->part.ecc = &part->ecc;
 130 +
 131 +       return &part->part;
 132 +
 133 +err:
 134 +       kfree(part);
 135 +       return ERR_PTR(ret);
 136 +}
 137 +
 138  static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
 139                                 struct device_node *np)
 140  {
 141         const struct nand_sdr_timings *timings;
 142         struct sunxi_nand_chip *chip;
 143 -       struct mtd_part_parser_data ppdata;
 144 +       struct ofnandpart_data ppdata;
 145         struct mtd_info *mtd;
 146         struct nand_chip *nand;
 147         int nsels;
 148 @@ -1269,8 +1318,14 @@ static int sunxi_nand_chip_init(struct device *dev, struct sunxi_nfc *nfc,
 149                 return ret;
 150         }
 151
 152 -       ppdata.of_node = np;
 153 -       ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
 154 +       ppdata.node = np;
 155 +       ppdata.parse = sunxi_ofnandpart_parse;
 156 +       ret = ofnandpart_parse(mtd, &ppdata);
 157 +       if (!ret)
 158 +               ret = mtd_device_register(mtd, NULL, 0);
 159 +       else if (ret > 0)
 160 +               ret = 0;
 161 +
 162         if (ret) {
 163                 dev_err(dev, "failed to register mtd device: %d\n", ret);
 164                 nand_release(mtd);