target/linux/ep93xx/patches-2.6.36/004-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 +18,16 @@
  19  #include <linux/kernel.h>
  20  #include <linux/init.h>
  21  #include <linux/platform_device.h>
  22 +#include <linux/mmc/host.h>
  23  #include <linux/gpio.h>
  24 +#include <linux/spi/spi.h>
  25 +#include <linux/spi/mmc_spi.h>
  26  #include <linux/i2c.h>
  27  #include <linux/i2c-gpio.h>
  28
  29  #include <mach/hardware.h>
  30  #include <mach/fb.h>
  31 +#include <mach/ep93xx_spi.h>
  32
  33  #include <asm/mach-types.h>
  34  #include <asm/mach/arch.h>
  35 @@ -38,6 +42,135 @@ static struct ep93xxfb_mach_info __initd
  36         .flags          = EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
  37  };
  38
  39 +/*
  40 + * GPIO lines used for MMC card detection.
  41 + */
  42 +#define MMC_CARD_DETECT_GPIO EP93XX_GPIO_LINE_EGPIO0
  43 +
  44 +/*
  45 + * If you have hacked your Sim.One to use a GPIO as SD card chip select
  46 + * (SD pin 1), uncomment the following line.
  47 + * The example, EGPIO15, is on TP17 near the CPU.
  48 + */
  49 +// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
  50 +
  51 +/*
  52 + * MMC SPI chip select GPIO handling. If you are using SFRMOUT (SFRM1) signal,
  53 + * you can leave these empty and pass NULL as .controller_data.
  54 + */
  55 +
  56 +#ifdef MMC_CHIP_SELECT_GPIO
  57 +static int simone_mmc_spi_setup(struct spi_device *spi)
  58 +{
  59 +       unsigned int gpio = MMC_CHIP_SELECT_GPIO;
  60 +       int err;
  61 +
  62 +       err = gpio_request(gpio, spi->modalias);
  63 +       if (err)
  64 +               return err;
  65 +
  66 +       err = gpio_direction_output(gpio, 1);
  67 +       if (err) {
  68 +               gpio_free(gpio);
  69 +               return err;
  70 +       }
  71 +
  72 +       return 0;
  73 +}
  74 +
  75 +static void simone_mmc_spi_cleanup(struct spi_device *spi)
  76 +{
  77 +       unsigned int gpio = MMC_CHIP_SELECT_GPIO;
  78 +
  79 +       gpio_set_value(gpio, 1);
  80 +       gpio_direction_input(gpio);
  81 +       gpio_free(gpio);
  82 +}
  83 +
  84 +static void simone_mmc_spi_cs_control(struct spi_device *spi, int value)
  85 +{
  86 +       gpio_set_value(MMC_CHIP_SELECT_GPIO, value);
  87 +}
  88 +
  89 +static struct ep93xx_spi_chip_ops simone_mmc_spi_ops = {
  90 +       .setup          = simone_mmc_spi_setup,
  91 +       .cleanup        = simone_mmc_spi_cleanup,
  92 +       .cs_control     = simone_mmc_spi_cs_control,
  93 +};
  94 +#endif
  95 +
  96 +/*
  97 + * MMC card detection GPIO setup.
  98 + */
  99 +static int simone_mmc_spi_init(struct device *dev,
 100 +       irqreturn_t (*irq_handler)(int, void *), void *mmc)
 101 +{
 102 +       unsigned int gpio = MMC_CARD_DETECT_GPIO;
 103 +       int irq, err;
 104 +
 105 +       err = gpio_request(gpio, dev_name(dev));
 106 +       if (err)
 107 +               return err;
 108 +
 109 +       err = gpio_direction_input(gpio);
 110 +       if (err)
 111 +               goto fail;
 112 +
 113 +       irq = gpio_to_irq(gpio);
 114 +       if (irq < 0)
 115 +               goto fail;
 116 +
 117 +       err = request_irq(irq, irq_handler, IRQF_TRIGGER_FALLING,
 118 +                               "MMC card detect", mmc);
 119 +       if (err)
 120 +               goto fail;
 121 +
 122 +       printk(KERN_INFO "%s: using irq %d for MMC card detection\n",
 123 +               dev_name(dev), irq);
 124 +
 125 +       return 0;
 126 +fail:
 127 +       gpio_free(gpio);
 128 +       return err;
 129 +}
 130 +
 131 +static void simone_mmc_spi_exit(struct device *dev, void *mmc)
 132 +{
 133 +       unsigned int gpio = MMC_CARD_DETECT_GPIO;
 134 +
 135 +       free_irq(gpio_to_irq(gpio), mmc);
 136 +       gpio_free(gpio);
 137 +}
 138 +
 139 +static struct mmc_spi_platform_data simone_mmc_spi_data = {
 140 +       .init           = simone_mmc_spi_init,
 141 +       .exit           = simone_mmc_spi_exit,
 142 +       .detect_delay   = 500,
 143 +       .ocr_mask       = MMC_VDD_32_33 | MMC_VDD_33_34,
 144 +};
 145 +
 146 +static struct spi_board_info simone_spi_devices[] __initdata = {
 147 +       {
 148 +               .modalias               = "mmc_spi",
 149 +#ifdef MMC_CHIP_SELECT_GPIO
 150 +               .controller_data        = &simone_mmc_spi_ops,
 151 +#endif
 152 +               .platform_data          = &simone_mmc_spi_data,
 153 +               /*
 154 +                * We use 10 MHz even though the maximum is 3.7 MHz. The driver
 155 +                * will limit it automatically to max. frequency.
 156 +                */
 157 +               .max_speed_hz           = 10 * 1000 * 1000,
 158 +               .bus_num                = 0,
 159 +               .chip_select            = 0,
 160 +               .mode                   = SPI_MODE_3,
 161 +       },
 162 +};
 163 +
 164 +static struct ep93xx_spi_info simone_spi_info __initdata = {
 165 +       .num_chipselect = ARRAY_SIZE(simone_spi_devices),
 166 +};
 167 +
 168  static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
 169         .sda_pin                = EP93XX_GPIO_LINE_EEDAT,
 170         .sda_is_open_drain      = 0,
 171 @@ -61,6 +194,8 @@ static void __init simone_init_machine(v
 172         ep93xx_register_fb(&simone_fb_info);
 173         ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
 174                             ARRAY_SIZE(simone_i2c_board_info));
 175 +       ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
 176 +                           ARRAY_SIZE(simone_spi_devices));
 177  }
 178
 179  MACHINE_START(SIM_ONE, "Simplemachines Sim.One Board")