ARM: ep93xx: simone: support for SPI-based MMC/SD cards
This includes setting up EGPIOs 0 and 9 for card detection and chip select respectively. This patch is needed to mount a root filesystem on the SPI-based MMC card reader found on the Sim.One. Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Kevin Hilman <khilman@linaro.org>
This commit is contained in:
Mika Westerberg
Kevin Hilman
parent
259413afbf
commit
d50bfa4763
1 changed files with 134 additions and 1 deletions
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@ -20,9 +20,14 @@
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#include <linux/platform_device.h>
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#include <linux/i2c.h>
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#include <linux/i2c-gpio.h>
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#include <linux/mmc/host.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/mmc_spi.h>
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#include <linux/platform_data/video-ep93xx.h>
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#include <linux/platform_data/spi-ep93xx.h>
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#include <linux/gpio.h>
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#include <mach/hardware.h>
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#include <linux/platform_data/video-ep93xx.h>
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#include <mach/gpio-ep93xx.h>
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#include <asm/mach-types.h>
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@ -40,6 +45,132 @@ static struct ep93xxfb_mach_info __initdata simone_fb_info = {
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.flags = EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
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};
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/*
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* GPIO lines used for MMC card detection.
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*/
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#define MMC_CARD_DETECT_GPIO EP93XX_GPIO_LINE_EGPIO0
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/*
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* Up to v1.3, the Sim.One used SFRMOUT as SD card chip select, but this goes
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* low between multi-message command blocks. From v1.4, it uses a GPIO instead.
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* v1.3 parts will still work, since the signal on SFRMOUT is automatic.
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*/
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#define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO1
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/*
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* MMC SPI chip select GPIO handling. If you are using SFRMOUT (SFRM1) signal,
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* you can leave these empty and pass NULL as .controller_data.
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*/
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static int simone_mmc_spi_setup(struct spi_device *spi)
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{
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unsigned int gpio = MMC_CHIP_SELECT_GPIO;
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int err;
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err = gpio_request(gpio, spi->modalias);
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if (err)
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return err;
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err = gpio_direction_output(gpio, 1);
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if (err) {
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gpio_free(gpio);
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return err;
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}
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return 0;
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}
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static void simone_mmc_spi_cleanup(struct spi_device *spi)
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{
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unsigned int gpio = MMC_CHIP_SELECT_GPIO;
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gpio_set_value(gpio, 1);
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gpio_direction_input(gpio);
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gpio_free(gpio);
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}
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static void simone_mmc_spi_cs_control(struct spi_device *spi, int value)
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{
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gpio_set_value(MMC_CHIP_SELECT_GPIO, value);
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}
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static struct ep93xx_spi_chip_ops simone_mmc_spi_ops = {
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.setup = simone_mmc_spi_setup,
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.cleanup = simone_mmc_spi_cleanup,
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.cs_control = simone_mmc_spi_cs_control,
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};
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/*
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* MMC card detection GPIO setup.
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*/
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static int simone_mmc_spi_init(struct device *dev,
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irqreturn_t (*irq_handler)(int, void *), void *mmc)
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{
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unsigned int gpio = MMC_CARD_DETECT_GPIO;
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int irq, err;
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err = gpio_request(gpio, dev_name(dev));
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if (err)
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return err;
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err = gpio_direction_input(gpio);
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if (err)
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goto fail;
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irq = gpio_to_irq(gpio);
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if (irq < 0)
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goto fail;
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err = request_irq(irq, irq_handler, IRQF_TRIGGER_FALLING,
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"MMC card detect", mmc);
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if (err)
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goto fail;
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printk(KERN_INFO "%s: using irq %d for MMC card detection\n",
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dev_name(dev), irq);
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return 0;
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fail:
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gpio_free(gpio);
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return err;
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}
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static void simone_mmc_spi_exit(struct device *dev, void *mmc)
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{
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unsigned int gpio = MMC_CARD_DETECT_GPIO;
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free_irq(gpio_to_irq(gpio), mmc);
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gpio_free(gpio);
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}
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static struct mmc_spi_platform_data simone_mmc_spi_data = {
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.init = simone_mmc_spi_init,
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.exit = simone_mmc_spi_exit,
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.detect_delay = 500,
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.ocr_mask = MMC_VDD_32_33 | MMC_VDD_33_34,
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};
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static struct spi_board_info simone_spi_devices[] __initdata = {
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{
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.modalias = "mmc_spi",
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.controller_data = &simone_mmc_spi_ops,
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.platform_data = &simone_mmc_spi_data,
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/*
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* We use 10 MHz even though the maximum is 3.7 MHz. The driver
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* will limit it automatically to max. frequency.
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*/
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.max_speed_hz = 10 * 1000 * 1000,
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.bus_num = 0,
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.chip_select = 0,
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.mode = SPI_MODE_3,
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},
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};
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static struct ep93xx_spi_info simone_spi_info __initdata = {
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.num_chipselect = ARRAY_SIZE(simone_spi_devices),
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};
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static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
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.sda_pin = EP93XX_GPIO_LINE_EEDAT,
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.sda_is_open_drain = 0,
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@ -74,6 +205,8 @@ static void __init simone_init_machine(void)
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ep93xx_register_fb(&simone_fb_info);
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ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
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ARRAY_SIZE(simone_i2c_board_info));
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ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
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ARRAY_SIZE(simone_spi_devices));
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simone_register_audio();
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}
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