target/linux/ar71xx/patches-3.3/205-spi-ath79-introduce-ath79_spi_-en-dis-able-helpers.patch

   1 From 4518ae06e5fc953abfd9c2b66c6155fc2b2696ce Mon Sep 17 00:00:00 2001
   2 From: Gabor Juhos <juhosg@openwrt.org>
   3 Date: Mon, 9 Jan 2012 15:00:46 +0100
   4 Subject: [PATCH 5/7] spi/ath79: introduce ath79_spi_{en,dis}able helpers
   5
   6 ---
   7  drivers/spi/spi-ath79.c |   41 +++++++++++++++++++++++++----------------
   8  1 files changed, 25 insertions(+), 16 deletions(-)
   9
  10 --- a/drivers/spi/spi-ath79.c
  11 +++ b/drivers/spi/spi-ath79.c
  12 @@ -89,16 +89,8 @@ static void ath79_spi_chipselect(struct
  13
  14  }
  15
  16 -static int ath79_spi_setup_cs(struct spi_device *spi)
  17 +static void ath79_spi_enable(struct ath79_spi *sp)
  18  {
  19 -       struct ath79_spi *sp = ath79_spidev_to_sp(spi);
  20 -       struct ath79_spi_controller_data *cdata;
  21 -       int status;
  22 -
  23 -       cdata = spi->controller_data;
  24 -       if (spi->chip_select && !cdata)
  25 -               return -EINVAL;
  26 -
  27         /* enable GPIO mode */
  28         ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
  29
  30 @@ -108,6 +100,24 @@ static int ath79_spi_setup_cs(struct spi
  31
  32         /* TODO: setup speed? */
  33         ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);
  34 +}
  35 +
  36 +static void ath79_spi_disable(struct ath79_spi *sp)
  37 +{
  38 +       /* restore CTRL register */
  39 +       ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
  40 +       /* disable GPIO mode */
  41 +       ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
  42 +}
  43 +
  44 +static int ath79_spi_setup_cs(struct spi_device *spi)
  45 +{
  46 +       struct ath79_spi_controller_data *cdata;
  47 +       int status;
  48 +
  49 +       cdata = spi->controller_data;
  50 +       if (spi->chip_select && !cdata)
  51 +               return -EINVAL;
  52
  53         status = 0;
  54         if (spi->chip_select) {
  55 @@ -128,17 +138,10 @@ static int ath79_spi_setup_cs(struct spi
  56
  57  static void ath79_spi_cleanup_cs(struct spi_device *spi)
  58  {
  59 -       struct ath79_spi *sp = ath79_spidev_to_sp(spi);
  60 -
  61         if (spi->chip_select) {
  62                 struct ath79_spi_controller_data *cdata = spi->controller_data;
  63                 gpio_free(cdata->gpio);
  64         }
  65 -
  66 -       /* restore CTRL register */
  67 -       ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
  68 -       /* disable GPIO mode */
  69 -       ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
  70  }
  71
  72  static int ath79_spi_setup(struct spi_device *spi)
  73 @@ -242,13 +245,15 @@ static __devinit int ath79_spi_probe(str
  74                 goto err_put_master;
  75         }
  76
  77 +       ath79_spi_enable(sp);
  78         ret = spi_bitbang_start(&sp->bitbang);
  79         if (ret)
  80 -               goto err_unmap;
  81 +               goto err_disable;
  82
  83         return 0;
  84
  85 -err_unmap:
  86 +err_disable:
  87 +       ath79_spi_disable(sp);
  88         iounmap(sp->base);
  89  err_put_master:
  90         platform_set_drvdata(pdev, NULL);
  91 @@ -262,6 +267,7 @@ static __devexit int ath79_spi_remove(st
  92         struct ath79_spi *sp = platform_get_drvdata(pdev);
  93
  94         spi_bitbang_stop(&sp->bitbang);
  95 +       ath79_spi_disable(sp);
  96         iounmap(sp->base);
  97         platform_set_drvdata(pdev, NULL);
  98         spi_master_put(sp->bitbang.master);