target/linux/mvebu/patches-3.10/0150-mtd-nand-pxa3xx-Add-a-read-write-buffers-markers.patch

   1 From 6e3022aeb5d221af838ad43a2163374aecacf929 Mon Sep 17 00:00:00 2001
   2 From: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
   3 Date: Thu, 14 Nov 2013 18:25:36 -0300
   4 Subject: [PATCH 150/203] mtd: nand: pxa3xx: Add a read/write buffers markers
   5
   6 In preparation to support multiple (aka chunked, aka splitted)
   7 page I/O, this commit adds 'data_buff_pos' and 'oob_buff_pos' fields
   8 to keep track of where the next read (or write) should be done.
   9
  10 This will allow multiple calls to handle_data_pio() to continue
  11 the read (or write) operation.
  12
  13 Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
  14 Tested-by: Daniel Mack <zonque@gmail.com>
  15 Signed-off-by: Brian Norris <computersforpeace@gmail.com>
  16 ---
  17  drivers/mtd/nand/pxa3xx_nand.c | 40 +++++++++++++++++++++++++++++-----------
  18  1 file changed, 29 insertions(+), 11 deletions(-)
  19
  20 --- a/drivers/mtd/nand/pxa3xx_nand.c
  21 +++ b/drivers/mtd/nand/pxa3xx_nand.c
  22 @@ -176,6 +176,8 @@ struct pxa3xx_nand_info {
  23         unsigned int            buf_start;
  24         unsigned int            buf_count;
  25         unsigned int            buf_size;
  26 +       unsigned int            data_buff_pos;
  27 +       unsigned int            oob_buff_pos;
  28
  29         /* DMA information */
  30         int                     drcmr_dat;
  31 @@ -338,11 +340,12 @@ static void pxa3xx_nand_set_timing(struc
  32   * spare and ECC configuration.
  33   * Only applicable to READ0, READOOB and PAGEPROG commands.
  34   */
  35 -static void pxa3xx_set_datasize(struct pxa3xx_nand_info *info)
  36 +static void pxa3xx_set_datasize(struct pxa3xx_nand_info *info,
  37 +                               struct mtd_info *mtd)
  38  {
  39         int oob_enable = info->reg_ndcr & NDCR_SPARE_EN;
  40
  41 -       info->data_size = info->fifo_size;
  42 +       info->data_size = mtd->writesize;
  43         if (!oob_enable)
  44                 return;
  45
  46 @@ -430,26 +433,39 @@ static void disable_int(struct pxa3xx_na
  47
  48  static void handle_data_pio(struct pxa3xx_nand_info *info)
  49  {
  50 +       unsigned int do_bytes = min(info->data_size, info->fifo_size);
  51 +
  52         switch (info->state) {
  53         case STATE_PIO_WRITING:
  54 -               __raw_writesl(info->mmio_base + NDDB, info->data_buff,
  55 -                               DIV_ROUND_UP(info->data_size, 4));
  56 +               __raw_writesl(info->mmio_base + NDDB,
  57 +                             info->data_buff + info->data_buff_pos,
  58 +                             DIV_ROUND_UP(do_bytes, 4));
  59 +
  60                 if (info->oob_size > 0)
  61 -                       __raw_writesl(info->mmio_base + NDDB, info->oob_buff,
  62 -                                       DIV_ROUND_UP(info->oob_size, 4));
  63 +                       __raw_writesl(info->mmio_base + NDDB,
  64 +                                     info->oob_buff + info->oob_buff_pos,
  65 +                                     DIV_ROUND_UP(info->oob_size, 4));
  66                 break;
  67         case STATE_PIO_READING:
  68 -               __raw_readsl(info->mmio_base + NDDB, info->data_buff,
  69 -                               DIV_ROUND_UP(info->data_size, 4));
  70 +               __raw_readsl(info->mmio_base + NDDB,
  71 +                            info->data_buff + info->data_buff_pos,
  72 +                            DIV_ROUND_UP(do_bytes, 4));
  73 +
  74                 if (info->oob_size > 0)
  75 -                       __raw_readsl(info->mmio_base + NDDB, info->oob_buff,
  76 -                                       DIV_ROUND_UP(info->oob_size, 4));
  77 +                       __raw_readsl(info->mmio_base + NDDB,
  78 +                                    info->oob_buff + info->oob_buff_pos,
  79 +                                    DIV_ROUND_UP(info->oob_size, 4));
  80                 break;
  81         default:
  82                 dev_err(&info->pdev->dev, "%s: invalid state %d\n", __func__,
  83                                 info->state);
  84                 BUG();
  85         }
  86 +
  87 +       /* Update buffer pointers for multi-page read/write */
  88 +       info->data_buff_pos += do_bytes;
  89 +       info->oob_buff_pos += info->oob_size;
  90 +       info->data_size -= do_bytes;
  91  }
  92
  93  #ifdef ARCH_HAS_DMA
  94 @@ -616,6 +632,8 @@ static void prepare_start_command(struct
  95         info->buf_start         = 0;
  96         info->buf_count         = 0;
  97         info->oob_size          = 0;
  98 +       info->data_buff_pos     = 0;
  99 +       info->oob_buff_pos      = 0;
 100         info->use_ecc           = 0;
 101         info->use_spare         = 1;
 102         info->retcode           = ERR_NONE;
 103 @@ -626,7 +644,7 @@ static void prepare_start_command(struct
 104         case NAND_CMD_PAGEPROG:
 105                 info->use_ecc = 1;
 106         case NAND_CMD_READOOB:
 107 -               pxa3xx_set_datasize(info);
 108 +               pxa3xx_set_datasize(info, mtd);
 109                 break;
 110         case NAND_CMD_PARAM:
 111                 info->use_spare = 0;