target/linux/ep93xx/patches-3.14/004-simone_add_mmc_spi.patch

   1 This enables the mmc-over-spi driver for the Sim.One board, based on Mika's
   2 patch, which used a GPIO for chip select in stead of the default SFRMOUT pin.
   3 I've modified it to use the usual SFRMOUT; if you've modified your Sim.One
   4 board to use a GPIO instead, uncomment and modify
   5 // #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
   6 in the source file.
   7    -martinwguy, 14 May 2010
   8
   9 From: Mika Westerberg <mika.westerberg@iki.fi>
  10 Date: Wed, 28 Apr 2010 08:42:46 +0300
  11 Subject: [PATCH] ep93xx: simone: added board specific SPI support for MMC/SD cards
  12
  13 This includes setting up EGPIOs 0 and 9 for card detection and chip select
  14 respectively.
  15
  16 --- a/arch/arm/mach-ep93xx/simone.c
  17 +++ b/arch/arm/mach-ep93xx/simone.c
  18 @@ -20,10 +20,15 @@
  19  #include <linux/platform_device.h>
  20  #include <linux/i2c.h>
  21  #include <linux/i2c-gpio.h>
  22 +#include <linux/gpio.h>
  23 +#include <linux/mmc/host.h>
  24 +#include <linux/spi/spi.h>
  25 +#include <linux/spi/mmc_spi.h>
  26
  27  #include <mach/hardware.h>
  28  #include <linux/platform_data/video-ep93xx.h>
  29  #include <mach/gpio-ep93xx.h>
  30 +#include <linux/platform_data/spi-ep93xx.h>
  31
  32  #include <asm/mach-types.h>
  33  #include <asm/mach/arch.h>
  34 @@ -40,6 +45,135 @@ static struct ep93xxfb_mach_info __initd
  35         .flags          = EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
  36  };
  37
  38 +/*
  39 + * GPIO lines used for MMC card detection.
  40 + */
  41 +#define MMC_CARD_DETECT_GPIO EP93XX_GPIO_LINE_EGPIO0
  42 +
  43 +/*
  44 + * If you have hacked your Sim.One to use a GPIO as SD card chip select
  45 + * (SD pin 1), uncomment the following line.
  46 + * The example, EGPIO15, is on TP17 near the CPU.
  47 + */
  48 +// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
  49 +
  50 +/*
  51 + * MMC SPI chip select GPIO handling. If you are using SFRMOUT (SFRM1) signal,
  52 + * you can leave these empty and pass NULL as .controller_data.
  53 + */
  54 +
  55 +#ifdef MMC_CHIP_SELECT_GPIO
  56 +static int simone_mmc_spi_setup(struct spi_device *spi)
  57 +{
  58 +       unsigned int gpio = MMC_CHIP_SELECT_GPIO;
  59 +       int err;
  60 +
  61 +       err = gpio_request(gpio, spi->modalias);
  62 +       if (err)
  63 +               return err;
  64 +
  65 +       err = gpio_direction_output(gpio, 1);
  66 +       if (err) {
  67 +               gpio_free(gpio);
  68 +               return err;
  69 +       }
  70 +
  71 +       return 0;
  72 +}
  73 +
  74 +static void simone_mmc_spi_cleanup(struct spi_device *spi)
  75 +{
  76 +       unsigned int gpio = MMC_CHIP_SELECT_GPIO;
  77 +
  78 +       gpio_set_value(gpio, 1);
  79 +       gpio_direction_input(gpio);
  80 +       gpio_free(gpio);
  81 +}
  82 +
  83 +static void simone_mmc_spi_cs_control(struct spi_device *spi, int value)
  84 +{
  85 +       gpio_set_value(MMC_CHIP_SELECT_GPIO, value);
  86 +}
  87 +
  88 +static struct ep93xx_spi_chip_ops simone_mmc_spi_ops = {
  89 +       .setup          = simone_mmc_spi_setup,
  90 +       .cleanup        = simone_mmc_spi_cleanup,
  91 +       .cs_control     = simone_mmc_spi_cs_control,
  92 +};
  93 +#endif
  94 +
  95 +/*
  96 + * MMC card detection GPIO setup.
  97 + */
  98 +static int simone_mmc_spi_init(struct device *dev,
  99 +       irqreturn_t (*irq_handler)(int, void *), void *mmc)
 100 +{
 101 +       unsigned int gpio = MMC_CARD_DETECT_GPIO;
 102 +       int irq, err;
 103 +
 104 +       err = gpio_request(gpio, dev_name(dev));
 105 +       if (err)
 106 +               return err;
 107 +
 108 +       err = gpio_direction_input(gpio);
 109 +       if (err)
 110 +               goto fail;
 111 +
 112 +       irq = gpio_to_irq(gpio);
 113 +       if (irq < 0)
 114 +               goto fail;
 115 +
 116 +       err = request_irq(irq, irq_handler, IRQF_TRIGGER_FALLING,
 117 +                               "MMC card detect", mmc);
 118 +       if (err)
 119 +               goto fail;
 120 +
 121 +       printk(KERN_INFO "%s: using irq %d for MMC card detection\n",
 122 +               dev_name(dev), irq);
 123 +
 124 +       return 0;
 125 +fail:
 126 +       gpio_free(gpio);
 127 +       return err;
 128 +}
 129 +
 130 +static void simone_mmc_spi_exit(struct device *dev, void *mmc)
 131 +{
 132 +       unsigned int gpio = MMC_CARD_DETECT_GPIO;
 133 +
 134 +       free_irq(gpio_to_irq(gpio), mmc);
 135 +       gpio_free(gpio);
 136 +}
 137 +
 138 +static struct mmc_spi_platform_data simone_mmc_spi_data = {
 139 +       .init           = simone_mmc_spi_init,
 140 +       .exit           = simone_mmc_spi_exit,
 141 +       .detect_delay   = 500,
 142 +       .ocr_mask       = MMC_VDD_32_33 | MMC_VDD_33_34,
 143 +};
 144 +
 145 +static struct spi_board_info simone_spi_devices[] __initdata = {
 146 +       {
 147 +               .modalias               = "mmc_spi",
 148 +#ifdef MMC_CHIP_SELECT_GPIO
 149 +               .controller_data        = &simone_mmc_spi_ops,
 150 +#endif
 151 +               .platform_data          = &simone_mmc_spi_data,
 152 +               /*
 153 +                * We use 10 MHz even though the maximum is 3.7 MHz. The driver
 154 +                * will limit it automatically to max. frequency.
 155 +                */
 156 +               .max_speed_hz           = 10 * 1000 * 1000,
 157 +               .bus_num                = 0,
 158 +               .chip_select            = 0,
 159 +               .mode                   = SPI_MODE_3,
 160 +       },
 161 +};
 162 +
 163 +static struct ep93xx_spi_info simone_spi_info __initdata = {
 164 +       .num_chipselect = ARRAY_SIZE(simone_spi_devices),
 165 +};
 166 +
 167  static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
 168         .sda_pin                = EP93XX_GPIO_LINE_EEDAT,
 169         .sda_is_open_drain      = 0,
 170 @@ -74,6 +208,8 @@ static void __init simone_init_machine(v
 171         ep93xx_register_fb(&simone_fb_info);
 172         ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
 173                             ARRAY_SIZE(simone_i2c_board_info));
 174 +       ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
 175 +                           ARRAY_SIZE(simone_spi_devices));
 176         simone_register_audio();
 177  }
 178