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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 2015-06-08 15:22:39 +02:00 committed by Kevin Hilman
parent 259413afbf
commit d50bfa4763
1 changed files with 134 additions and 1 deletions
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135
arch/arm/mach-ep93xx/simone.c
View File

@ -20,9 +20,14 @@
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h>
#include <linux/mmc/host.h>
#include <linux/spi/spi.h>
#include <linux/spi/mmc_spi.h>
#include <linux/platform_data/video-ep93xx.h>
#include <linux/platform_data/spi-ep93xx.h>
#include <linux/gpio.h>
#include <mach/hardware.h>
#include <linux/platform_data/video-ep93xx.h>
#include <mach/gpio-ep93xx.h>
#include <asm/mach-types.h>
@ -40,6 +45,132 @@ static struct ep93xxfb_mach_info __initdata simone_fb_info = {
.flags = EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
};
/*
* GPIO lines used for MMC card detection.
*/
#define MMC_CARD_DETECT_GPIO EP93XX_GPIO_LINE_EGPIO0
/*
* Up to v1.3, the Sim.One used SFRMOUT as SD card chip select, but this goes
* low between multi-message command blocks. From v1.4, it uses a GPIO instead.
* v1.3 parts will still work, since the signal on SFRMOUT is automatic.
*/
#define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO1
/*
* MMC SPI chip select GPIO handling. If you are using SFRMOUT (SFRM1) signal,
* you can leave these empty and pass NULL as .controller_data.
*/
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,
};
/*
* 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",
.controller_data = &simone_mmc_spi_ops,
.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 +205,8 @@ static void __init simone_init_machine(void)
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();
}