target/linux/ep93xx/patches-3.2/004-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 @@ -18,12 +18,17 @@
  19  #include <linux/kernel.h>
  20  #include <linux/init.h>
  21  #include <linux/platform_device.h>
  22 +#include <linux/gpio.h>
  23  #include <linux/i2c.h>
  24  #include <linux/i2c-gpio.h>
  25 +#include <linux/mmc/host.h>
  26 +#include <linux/spi/spi.h>
  27 +#include <linux/spi/mmc_spi.h>
  28
  29  #include <mach/hardware.h>
  30  #include <mach/fb.h>
  31  #include <mach/gpio-ep93xx.h>
  32 +#include <mach/ep93xx_spi.h>
  33
  34  #include <asm/mach-types.h>
  35  #include <asm/mach/arch.h>
  36 @@ -38,6 +43,135 @@ static struct ep93xxfb_mach_info __initd
  37         .flags          = EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
  38  };
  39
  40 +/*
  41 + * GPIO lines used for MMC card detection.
  42 + */
  43 +#define MMC_CARD_DETECT_GPIO EP93XX_GPIO_LINE_EGPIO0
  44 +
  45 +/*
  46 + * If you have hacked your Sim.One to use a GPIO as SD card chip select
  47 + * (SD pin 1), uncomment the following line.
  48 + * The example, EGPIO15, is on TP17 near the CPU.
  49 + */
  50 +// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
  51 +
  52 +/*
  53 + * MMC SPI chip select GPIO handling. If you are using SFRMOUT (SFRM1) signal,
  54 + * you can leave these empty and pass NULL as .controller_data.
  55 + */
  56 +
  57 +#ifdef MMC_CHIP_SELECT_GPIO
  58 +static int simone_mmc_spi_setup(struct spi_device *spi)
  59 +{
  60 +       unsigned int gpio = MMC_CHIP_SELECT_GPIO;
  61 +       int err;
  62 +
  63 +       err = gpio_request(gpio, spi->modalias);
  64 +       if (err)
  65 +               return err;
  66 +
  67 +       err = gpio_direction_output(gpio, 1);
  68 +       if (err) {
  69 +               gpio_free(gpio);
  70 +               return err;
  71 +       }
  72 +
  73 +       return 0;
  74 +}
  75 +
  76 +static void simone_mmc_spi_cleanup(struct spi_device *spi)
  77 +{
  78 +       unsigned int gpio = MMC_CHIP_SELECT_GPIO;
  79 +
  80 +       gpio_set_value(gpio, 1);
  81 +       gpio_direction_input(gpio);
  82 +       gpio_free(gpio);
  83 +}
  84 +
  85 +static void simone_mmc_spi_cs_control(struct spi_device *spi, int value)
  86 +{
  87 +       gpio_set_value(MMC_CHIP_SELECT_GPIO, value);
  88 +}
  89 +
  90 +static struct ep93xx_spi_chip_ops simone_mmc_spi_ops = {
  91 +       .setup          = simone_mmc_spi_setup,
  92 +       .cleanup        = simone_mmc_spi_cleanup,
  93 +       .cs_control     = simone_mmc_spi_cs_control,
  94 +};
  95 +#endif
  96 +
  97 +/*
  98 + * MMC card detection GPIO setup.
  99 + */
 100 +static int simone_mmc_spi_init(struct device *dev,
 101 +       irqreturn_t (*irq_handler)(int, void *), void *mmc)
 102 +{
 103 +       unsigned int gpio = MMC_CARD_DETECT_GPIO;
 104 +       int irq, err;
 105 +
 106 +       err = gpio_request(gpio, dev_name(dev));
 107 +       if (err)
 108 +               return err;
 109 +
 110 +       err = gpio_direction_input(gpio);
 111 +       if (err)
 112 +               goto fail;
 113 +
 114 +       irq = gpio_to_irq(gpio);
 115 +       if (irq < 0)
 116 +               goto fail;
 117 +
 118 +       err = request_irq(irq, irq_handler, IRQF_TRIGGER_FALLING,
 119 +                               "MMC card detect", mmc);
 120 +       if (err)
 121 +               goto fail;
 122 +
 123 +       printk(KERN_INFO "%s: using irq %d for MMC card detection\n",
 124 +               dev_name(dev), irq);
 125 +
 126 +       return 0;
 127 +fail:
 128 +       gpio_free(gpio);
 129 +       return err;
 130 +}
 131 +
 132 +static void simone_mmc_spi_exit(struct device *dev, void *mmc)
 133 +{
 134 +       unsigned int gpio = MMC_CARD_DETECT_GPIO;
 135 +
 136 +       free_irq(gpio_to_irq(gpio), mmc);
 137 +       gpio_free(gpio);
 138 +}
 139 +
 140 +static struct mmc_spi_platform_data simone_mmc_spi_data = {
 141 +       .init           = simone_mmc_spi_init,
 142 +       .exit           = simone_mmc_spi_exit,
 143 +       .detect_delay   = 500,
 144 +       .ocr_mask       = MMC_VDD_32_33 | MMC_VDD_33_34,
 145 +};
 146 +
 147 +static struct spi_board_info simone_spi_devices[] __initdata = {
 148 +       {
 149 +               .modalias               = "mmc_spi",
 150 +#ifdef MMC_CHIP_SELECT_GPIO
 151 +               .controller_data        = &simone_mmc_spi_ops,
 152 +#endif
 153 +               .platform_data          = &simone_mmc_spi_data,
 154 +               /*
 155 +                * We use 10 MHz even though the maximum is 3.7 MHz. The driver
 156 +                * will limit it automatically to max. frequency.
 157 +                */
 158 +               .max_speed_hz           = 10 * 1000 * 1000,
 159 +               .bus_num                = 0,
 160 +               .chip_select            = 0,
 161 +               .mode                   = SPI_MODE_3,
 162 +       },
 163 +};
 164 +
 165 +static struct ep93xx_spi_info simone_spi_info __initdata = {
 166 +       .num_chipselect = ARRAY_SIZE(simone_spi_devices),
 167 +};
 168 +
 169  static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
 170         .sda_pin                = EP93XX_GPIO_LINE_EEDAT,
 171         .sda_is_open_drain      = 0,
 172 @@ -72,6 +206,8 @@ static void __init simone_init_machine(v
 173         ep93xx_register_fb(&simone_fb_info);
 174         ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
 175                             ARRAY_SIZE(simone_i2c_board_info));
 176 +       ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
 177 +                           ARRAY_SIZE(simone_spi_devices));
 178         simone_register_audio();
 179  }
 180