You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
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
|
|
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/hardware/vic.h>
|
|
#include <asm/mach-types.h>
|
|
@@ -41,6 +46,135 @@ 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,
|
|
@@ -75,6 +209,8 @@ 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();
|
|
}
|
|
|