1 This enables the mmc-over-spi driver for the Sim.One board, based on Mika's
2 patch, which used a GPIO for chip select in stead of the default SFRMOUT pin.
3 I've modified it to use the usual SFRMOUT; if you've modified your Sim.One
4 board to use a GPIO instead, uncomment and modify
5 // #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
7 -martinwguy, 14 May 2010
9 From: Mika Westerberg <mika.westerberg@iki.fi>
10 Date: Wed, 28 Apr 2010 08:42:46 +0300
11 Subject: [PATCH] ep93xx: simone: added board specific SPI support for MMC/SD cards
13 This includes setting up EGPIOs 0 and 9 for card detection and chip select
16 --- a/arch/arm/mach-ep93xx/simone.c
17 +++ b/arch/arm/mach-ep93xx/simone.c
19 #include <linux/platform_device.h>
20 #include <linux/i2c.h>
21 #include <linux/i2c-gpio.h>
22 +#include <linux/gpio.h>
23 +#include <linux/mmc/host.h>
24 +#include <linux/spi/spi.h>
25 +#include <linux/spi/mmc_spi.h>
27 #include <mach/hardware.h>
28 #include <linux/platform_data/video-ep93xx.h>
29 #include <mach/gpio-ep93xx.h>
30 +#include <linux/platform_data/spi-ep93xx.h>
32 #include <asm/hardware/vic.h>
33 #include <asm/mach-types.h>
34 @@ -41,6 +46,135 @@ static struct ep93xxfb_mach_info __initd
35 .flags = EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
39 + * GPIO lines used for MMC card detection.
41 +#define MMC_CARD_DETECT_GPIO EP93XX_GPIO_LINE_EGPIO0
44 + * If you have hacked your Sim.One to use a GPIO as SD card chip select
45 + * (SD pin 1), uncomment the following line.
46 + * The example, EGPIO15, is on TP17 near the CPU.
48 +// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
51 + * MMC SPI chip select GPIO handling. If you are using SFRMOUT (SFRM1) signal,
52 + * you can leave these empty and pass NULL as .controller_data.
55 +#ifdef MMC_CHIP_SELECT_GPIO
56 +static int simone_mmc_spi_setup(struct spi_device *spi)
58 + unsigned int gpio = MMC_CHIP_SELECT_GPIO;
61 + err = gpio_request(gpio, spi->modalias);
65 + err = gpio_direction_output(gpio, 1);
74 +static void simone_mmc_spi_cleanup(struct spi_device *spi)
76 + unsigned int gpio = MMC_CHIP_SELECT_GPIO;
78 + gpio_set_value(gpio, 1);
79 + gpio_direction_input(gpio);
83 +static void simone_mmc_spi_cs_control(struct spi_device *spi, int value)
85 + gpio_set_value(MMC_CHIP_SELECT_GPIO, value);
88 +static struct ep93xx_spi_chip_ops simone_mmc_spi_ops = {
89 + .setup = simone_mmc_spi_setup,
90 + .cleanup = simone_mmc_spi_cleanup,
91 + .cs_control = simone_mmc_spi_cs_control,
96 + * MMC card detection GPIO setup.
98 +static int simone_mmc_spi_init(struct device *dev,
99 + irqreturn_t (*irq_handler)(int, void *), void *mmc)
101 + unsigned int gpio = MMC_CARD_DETECT_GPIO;
104 + err = gpio_request(gpio, dev_name(dev));
108 + err = gpio_direction_input(gpio);
112 + irq = gpio_to_irq(gpio);
116 + err = request_irq(irq, irq_handler, IRQF_TRIGGER_FALLING,
117 + "MMC card detect", mmc);
121 + printk(KERN_INFO "%s: using irq %d for MMC card detection\n",
122 + dev_name(dev), irq);
130 +static void simone_mmc_spi_exit(struct device *dev, void *mmc)
132 + unsigned int gpio = MMC_CARD_DETECT_GPIO;
134 + free_irq(gpio_to_irq(gpio), mmc);
138 +static struct mmc_spi_platform_data simone_mmc_spi_data = {
139 + .init = simone_mmc_spi_init,
140 + .exit = simone_mmc_spi_exit,
141 + .detect_delay = 500,
142 + .ocr_mask = MMC_VDD_32_33 | MMC_VDD_33_34,
145 +static struct spi_board_info simone_spi_devices[] __initdata = {
147 + .modalias = "mmc_spi",
148 +#ifdef MMC_CHIP_SELECT_GPIO
149 + .controller_data = &simone_mmc_spi_ops,
151 + .platform_data = &simone_mmc_spi_data,
153 + * We use 10 MHz even though the maximum is 3.7 MHz. The driver
154 + * will limit it automatically to max. frequency.
156 + .max_speed_hz = 10 * 1000 * 1000,
159 + .mode = SPI_MODE_3,
163 +static struct ep93xx_spi_info simone_spi_info __initdata = {
164 + .num_chipselect = ARRAY_SIZE(simone_spi_devices),
167 static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
168 .sda_pin = EP93XX_GPIO_LINE_EEDAT,
169 .sda_is_open_drain = 0,
170 @@ -75,6 +209,8 @@ static void __init simone_init_machine(v
171 ep93xx_register_fb(&simone_fb_info);
172 ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
173 ARRAY_SIZE(simone_i2c_board_info));
174 + ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
175 + ARRAY_SIZE(simone_spi_devices));
176 simone_register_audio();