| 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/hardware/vic.h> |
| 35 | #include <asm/mach-types.h> |
| 36 | @@ -39,6 +44,135 @@ 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 | @@ -73,6 +207,8 @@ 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 | |
| 181 | |
