--- /dev/null
+This enables the mmc-over-spi driver for the Sim.One board, based on Mika's
+patch, which used a GPIO for chip select in stead of the default SFRMOUT pin.
+I've modified it to use the usual SFRMOUT; if you've modified your Sim.One
+board to use a GPIO instead, uncomment and modify
+// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
+in the source file.
+ -martinwguy, 14 May 2010
+
+From: Mika Westerberg <mika.westerberg@iki.fi>
+Date: Wed, 28 Apr 2010 08:42:46 +0300
+Subject: [PATCH] ep93xx: simone: added board specific SPI support for MMC/SD cards
+
+This includes setting up EGPIOs 0 and 9 for card detection and chip select
+respectively.
+
+--- a/arch/arm/mach-ep93xx/simone.c
++++ b/arch/arm/mach-ep93xx/simone.c
+@@ -20,10 +20,15 @@
+ #include <linux/platform_device.h>
+ #include <linux/i2c.h>
+ #include <linux/i2c-gpio.h>
++#include <linux/gpio.h>
++#include <linux/mmc/host.h>
++#include <linux/spi/spi.h>
++#include <linux/spi/mmc_spi.h>
+
+ #include <mach/hardware.h>
+ #include <linux/platform_data/video-ep93xx.h>
+ #include <mach/gpio-ep93xx.h>
++#include <linux/platform_data/spi-ep93xx.h>
+
+ #include <asm/mach-types.h>
+ #include <asm/mach/arch.h>
+@@ -40,6 +45,135 @@ static struct ep93xxfb_mach_info __initd
+ .flags = EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
+ };
+
++/*
++ * GPIO lines used for MMC card detection.
++ */
++#define MMC_CARD_DETECT_GPIO EP93XX_GPIO_LINE_EGPIO0
++
++/*
++ * If you have hacked your Sim.One to use a GPIO as SD card chip select
++ * (SD pin 1), uncomment the following line.
++ * The example, EGPIO15, is on TP17 near the CPU.
++ */
++// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
++
++/*
++ * MMC SPI chip select GPIO handling. If you are using SFRMOUT (SFRM1) signal,
++ * you can leave these empty and pass NULL as .controller_data.
++ */
++
++#ifdef MMC_CHIP_SELECT_GPIO
++static int simone_mmc_spi_setup(struct spi_device *spi)
++{
++ unsigned int gpio = MMC_CHIP_SELECT_GPIO;
++ int err;
++
++ err = gpio_request(gpio, spi->modalias);
++ if (err)
++ return err;
++
++ err = gpio_direction_output(gpio, 1);
++ if (err) {
++ gpio_free(gpio);
++ return err;
++ }
++
++ return 0;
++}
++
++static void simone_mmc_spi_cleanup(struct spi_device *spi)
++{
++ unsigned int gpio = MMC_CHIP_SELECT_GPIO;
++
++ gpio_set_value(gpio, 1);
++ gpio_direction_input(gpio);
++ gpio_free(gpio);
++}
++
++static void simone_mmc_spi_cs_control(struct spi_device *spi, int value)
++{
++ gpio_set_value(MMC_CHIP_SELECT_GPIO, value);
++}
++
++static struct ep93xx_spi_chip_ops simone_mmc_spi_ops = {
++ .setup = simone_mmc_spi_setup,
++ .cleanup = simone_mmc_spi_cleanup,
++ .cs_control = simone_mmc_spi_cs_control,
++};
++#endif
++
++/*
++ * MMC card detection GPIO setup.
++ */
++static int simone_mmc_spi_init(struct device *dev,
++ irqreturn_t (*irq_handler)(int, void *), void *mmc)
++{
++ unsigned int gpio = MMC_CARD_DETECT_GPIO;
++ int irq, err;
++
++ err = gpio_request(gpio, dev_name(dev));
++ if (err)
++ return err;
++
++ err = gpio_direction_input(gpio);
++ if (err)
++ goto fail;
++
++ irq = gpio_to_irq(gpio);
++ if (irq < 0)
++ goto fail;
++
++ err = request_irq(irq, irq_handler, IRQF_TRIGGER_FALLING,
++ "MMC card detect", mmc);
++ if (err)
++ goto fail;
++
++ printk(KERN_INFO "%s: using irq %d for MMC card detection\n",
++ dev_name(dev), irq);
++
++ return 0;
++fail:
++ gpio_free(gpio);
++ return err;
++}
++
++static void simone_mmc_spi_exit(struct device *dev, void *mmc)
++{
++ unsigned int gpio = MMC_CARD_DETECT_GPIO;
++
++ free_irq(gpio_to_irq(gpio), mmc);
++ gpio_free(gpio);
++}
++
++static struct mmc_spi_platform_data simone_mmc_spi_data = {
++ .init = simone_mmc_spi_init,
++ .exit = simone_mmc_spi_exit,
++ .detect_delay = 500,
++ .ocr_mask = MMC_VDD_32_33 | MMC_VDD_33_34,
++};
++
++static struct spi_board_info simone_spi_devices[] __initdata = {
++ {
++ .modalias = "mmc_spi",
++#ifdef MMC_CHIP_SELECT_GPIO
++ .controller_data = &simone_mmc_spi_ops,
++#endif
++ .platform_data = &simone_mmc_spi_data,
++ /*
++ * We use 10 MHz even though the maximum is 3.7 MHz. The driver
++ * will limit it automatically to max. frequency.
++ */
++ .max_speed_hz = 10 * 1000 * 1000,
++ .bus_num = 0,
++ .chip_select = 0,
++ .mode = SPI_MODE_3,
++ },
++};
++
++static struct ep93xx_spi_info simone_spi_info __initdata = {
++ .num_chipselect = ARRAY_SIZE(simone_spi_devices),
++};
++
+ static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
+ .sda_pin = EP93XX_GPIO_LINE_EEDAT,
+ .sda_is_open_drain = 0,
+@@ -74,6 +208,8 @@ static void __init simone_init_machine(v
+ ep93xx_register_fb(&simone_fb_info);
+ ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
+ ARRAY_SIZE(simone_i2c_board_info));
++ ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
++ ARRAY_SIZE(simone_spi_devices));
+ simone_register_audio();
+ }
+
projects / openwrt / svn-archive / archive.git / blobdiff