179 lines
4.6 KiB
Diff
179 lines
4.6 KiB
Diff
This enables the mmc-over-spi driver for the Sim.One board, based on Mika's
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patch, which used a GPIO for chip select in stead of the default SFRMOUT pin.
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I've modified it to use the usual SFRMOUT; if you've modified your Sim.One
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board to use a GPIO instead, uncomment and modify
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// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
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in the source file.
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-martinwguy, 14 May 2010
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From: Mika Westerberg <mika.westerberg@iki.fi>
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Date: Wed, 28 Apr 2010 08:42:46 +0300
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Subject: [PATCH] ep93xx: simone: added board specific SPI support for MMC/SD cards
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This includes setting up EGPIOs 0 and 9 for card detection and chip select
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respectively.
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--- a/arch/arm/mach-ep93xx/simone.c
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+++ b/arch/arm/mach-ep93xx/simone.c
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@@ -18,12 +18,16 @@
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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+#include <linux/mmc/host.h>
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#include <linux/gpio.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/i2c.h>
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#include <linux/i2c-gpio.h>
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#include <mach/hardware.h>
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#include <mach/fb.h>
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+#include <mach/ep93xx_spi.h>
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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@@ -38,6 +42,135 @@ static struct ep93xxfb_mach_info __initd
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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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+/*
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+ * If you have hacked your Sim.One to use a GPIO as SD card chip select
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+ * (SD pin 1), uncomment the following line.
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+ * The example, EGPIO15, is on TP17 near the CPU.
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+ */
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+// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
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+
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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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+
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+#ifdef MMC_CHIP_SELECT_GPIO
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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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+
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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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+
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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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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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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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+#endif
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+#ifdef MMC_CHIP_SELECT_GPIO
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+ .controller_data = &simone_mmc_spi_ops,
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+#endif
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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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+
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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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+
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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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@@ -61,6 +194,8 @@ static void __init simone_init_machine(v
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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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ep93xx_register_ac97();
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}
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