Root/target/linux/ep93xx/patches-2.6.39/004-simone_add_mmc_spi.patch

1This enables the mmc-over-spi driver for the Sim.One board, based on Mika's
2patch, which used a GPIO for chip select in stead of the default SFRMOUT pin.
3I've modified it to use the usual SFRMOUT; if you've modified your Sim.One
4board to use a GPIO instead, uncomment and modify
5// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
6in the source file.
7   -martinwguy, 14 May 2010
8
9From: Mika Westerberg <mika.westerberg@iki.fi>
10Date: Wed, 28 Apr 2010 08:42:46 +0300
11Subject: [PATCH] ep93xx: simone: added board specific SPI support for MMC/SD cards
12
13This includes setting up EGPIOs 0 and 9 for card detection and chip select
14respectively.
15
16--- a/arch/arm/mach-ep93xx/simone.c
17+++ b/arch/arm/mach-ep93xx/simone.c
18@@ -18,12 +18,16 @@
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22+#include <linux/mmc/host.h>
23 #include <linux/gpio.h>
24+#include <linux/spi/spi.h>
25+#include <linux/spi/mmc_spi.h>
26 #include <linux/i2c.h>
27 #include <linux/i2c-gpio.h>
28 
29 #include <mach/hardware.h>
30 #include <mach/fb.h>
31+#include <mach/ep93xx_spi.h>
32 
33 #include <asm/mach-types.h>
34 #include <asm/mach/arch.h>
35@@ -38,6 +42,135 @@ static struct ep93xxfb_mach_info __initd
36     .flags = EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
37 };
38 
39+/*
40+ * GPIO lines used for MMC card detection.
41+ */
42+#define MMC_CARD_DETECT_GPIO EP93XX_GPIO_LINE_EGPIO0
43+
44+/*
45+ * If you have hacked your Sim.One to use a GPIO as SD card chip select
46+ * (SD pin 1), uncomment the following line.
47+ * The example, EGPIO15, is on TP17 near the CPU.
48+ */
49+// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
50+
51+/*
52+ * MMC SPI chip select GPIO handling. If you are using SFRMOUT (SFRM1) signal,
53+ * you can leave these empty and pass NULL as .controller_data.
54+ */
55+
56+#ifdef MMC_CHIP_SELECT_GPIO
57+static int simone_mmc_spi_setup(struct spi_device *spi)
58+{
59+ unsigned int gpio = MMC_CHIP_SELECT_GPIO;
60+ int err;
61+
62+ err = gpio_request(gpio, spi->modalias);
63+ if (err)
64+ return err;
65+
66+ err = gpio_direction_output(gpio, 1);
67+ if (err) {
68+ gpio_free(gpio);
69+ return err;
70+ }
71+
72+ return 0;
73+}
74+
75+static void simone_mmc_spi_cleanup(struct spi_device *spi)
76+{
77+ unsigned int gpio = MMC_CHIP_SELECT_GPIO;
78+
79+ gpio_set_value(gpio, 1);
80+ gpio_direction_input(gpio);
81+ gpio_free(gpio);
82+}
83+
84+static void simone_mmc_spi_cs_control(struct spi_device *spi, int value)
85+{
86+ gpio_set_value(MMC_CHIP_SELECT_GPIO, value);
87+}
88+
89+static struct ep93xx_spi_chip_ops simone_mmc_spi_ops = {
90+ .setup = simone_mmc_spi_setup,
91+ .cleanup = simone_mmc_spi_cleanup,
92+ .cs_control = simone_mmc_spi_cs_control,
93+};
94+#endif
95+
96+/*
97+ * MMC card detection GPIO setup.
98+ */
99+static int simone_mmc_spi_init(struct device *dev,
100+ irqreturn_t (*irq_handler)(int, void *), void *mmc)
101+{
102+ unsigned int gpio = MMC_CARD_DETECT_GPIO;
103+ int irq, err;
104+
105+ err = gpio_request(gpio, dev_name(dev));
106+ if (err)
107+ return err;
108+
109+ err = gpio_direction_input(gpio);
110+ if (err)
111+ goto fail;
112+
113+ irq = gpio_to_irq(gpio);
114+ if (irq < 0)
115+ goto fail;
116+
117+ err = request_irq(irq, irq_handler, IRQF_TRIGGER_FALLING,
118+ "MMC card detect", mmc);
119+ if (err)
120+ goto fail;
121+
122+ printk(KERN_INFO "%s: using irq %d for MMC card detection\n",
123+ dev_name(dev), irq);
124+
125+ return 0;
126+fail:
127+ gpio_free(gpio);
128+ return err;
129+}
130+
131+static void simone_mmc_spi_exit(struct device *dev, void *mmc)
132+{
133+ unsigned int gpio = MMC_CARD_DETECT_GPIO;
134+
135+ free_irq(gpio_to_irq(gpio), mmc);
136+ gpio_free(gpio);
137+}
138+
139+static struct mmc_spi_platform_data simone_mmc_spi_data = {
140+ .init = simone_mmc_spi_init,
141+ .exit = simone_mmc_spi_exit,
142+ .detect_delay = 500,
143+ .ocr_mask = MMC_VDD_32_33 | MMC_VDD_33_34,
144+};
145+
146+static struct spi_board_info simone_spi_devices[] __initdata = {
147+ {
148+ .modalias = "mmc_spi",
149+#ifdef MMC_CHIP_SELECT_GPIO
150+ .controller_data = &simone_mmc_spi_ops,
151+#endif
152+ .platform_data = &simone_mmc_spi_data,
153+ /*
154+ * We use 10 MHz even though the maximum is 3.7 MHz. The driver
155+ * will limit it automatically to max. frequency.
156+ */
157+ .max_speed_hz = 10 * 1000 * 1000,
158+ .bus_num = 0,
159+ .chip_select = 0,
160+ .mode = SPI_MODE_3,
161+ },
162+};
163+
164+static struct ep93xx_spi_info simone_spi_info __initdata = {
165+ .num_chipselect = ARRAY_SIZE(simone_spi_devices),
166+};
167+
168 static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
169     .sda_pin = EP93XX_GPIO_LINE_EEDAT,
170     .sda_is_open_drain = 0,
171@@ -61,6 +194,8 @@ static void __init simone_init_machine(v
172     ep93xx_register_fb(&simone_fb_info);
173     ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
174                 ARRAY_SIZE(simone_i2c_board_info));
175+ ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
176+ ARRAY_SIZE(simone_spi_devices));
177     ep93xx_register_ac97();
178 }
179 
180

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