Root/target/linux/ep93xx/patches-3.6/004-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 +18,17 @@
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/platform_device.h>
22+#include <linux/gpio.h>
23 #include <linux/i2c.h>
24 #include <linux/i2c-gpio.h>
25+#include <linux/mmc/host.h>
26+#include <linux/spi/spi.h>
27+#include <linux/spi/mmc_spi.h>
28 
29 #include <mach/hardware.h>
30 #include <mach/fb.h>
31 #include <mach/gpio-ep93xx.h>
32+#include <mach/ep93xx_spi.h>
33 
34 #include <asm/hardware/vic.h>
35 #include <asm/mach-types.h>
36@@ -41,6 +46,135 @@ static struct ep93xxfb_mach_info __initd
37     .flags = EP93XXFB_USE_SDCSN0 | EP93XXFB_PCLK_FALLING,
38 };
39 
40+/*
41+ * GPIO lines used for MMC card detection.
42+ */
43+#define MMC_CARD_DETECT_GPIO EP93XX_GPIO_LINE_EGPIO0
44+
45+/*
46+ * If you have hacked your Sim.One to use a GPIO as SD card chip select
47+ * (SD pin 1), uncomment the following line.
48+ * The example, EGPIO15, is on TP17 near the CPU.
49+ */
50+// #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO15
51+
52+/*
53+ * MMC SPI chip select GPIO handling. If you are using SFRMOUT (SFRM1) signal,
54+ * you can leave these empty and pass NULL as .controller_data.
55+ */
56+
57+#ifdef MMC_CHIP_SELECT_GPIO
58+static int simone_mmc_spi_setup(struct spi_device *spi)
59+{
60+ unsigned int gpio = MMC_CHIP_SELECT_GPIO;
61+ int err;
62+
63+ err = gpio_request(gpio, spi->modalias);
64+ if (err)
65+ return err;
66+
67+ err = gpio_direction_output(gpio, 1);
68+ if (err) {
69+ gpio_free(gpio);
70+ return err;
71+ }
72+
73+ return 0;
74+}
75+
76+static void simone_mmc_spi_cleanup(struct spi_device *spi)
77+{
78+ unsigned int gpio = MMC_CHIP_SELECT_GPIO;
79+
80+ gpio_set_value(gpio, 1);
81+ gpio_direction_input(gpio);
82+ gpio_free(gpio);
83+}
84+
85+static void simone_mmc_spi_cs_control(struct spi_device *spi, int value)
86+{
87+ gpio_set_value(MMC_CHIP_SELECT_GPIO, value);
88+}
89+
90+static struct ep93xx_spi_chip_ops simone_mmc_spi_ops = {
91+ .setup = simone_mmc_spi_setup,
92+ .cleanup = simone_mmc_spi_cleanup,
93+ .cs_control = simone_mmc_spi_cs_control,
94+};
95+#endif
96+
97+/*
98+ * MMC card detection GPIO setup.
99+ */
100+static int simone_mmc_spi_init(struct device *dev,
101+ irqreturn_t (*irq_handler)(int, void *), void *mmc)
102+{
103+ unsigned int gpio = MMC_CARD_DETECT_GPIO;
104+ int irq, err;
105+
106+ err = gpio_request(gpio, dev_name(dev));
107+ if (err)
108+ return err;
109+
110+ err = gpio_direction_input(gpio);
111+ if (err)
112+ goto fail;
113+
114+ irq = gpio_to_irq(gpio);
115+ if (irq < 0)
116+ goto fail;
117+
118+ err = request_irq(irq, irq_handler, IRQF_TRIGGER_FALLING,
119+ "MMC card detect", mmc);
120+ if (err)
121+ goto fail;
122+
123+ printk(KERN_INFO "%s: using irq %d for MMC card detection\n",
124+ dev_name(dev), irq);
125+
126+ return 0;
127+fail:
128+ gpio_free(gpio);
129+ return err;
130+}
131+
132+static void simone_mmc_spi_exit(struct device *dev, void *mmc)
133+{
134+ unsigned int gpio = MMC_CARD_DETECT_GPIO;
135+
136+ free_irq(gpio_to_irq(gpio), mmc);
137+ gpio_free(gpio);
138+}
139+
140+static struct mmc_spi_platform_data simone_mmc_spi_data = {
141+ .init = simone_mmc_spi_init,
142+ .exit = simone_mmc_spi_exit,
143+ .detect_delay = 500,
144+ .ocr_mask = MMC_VDD_32_33 | MMC_VDD_33_34,
145+};
146+
147+static struct spi_board_info simone_spi_devices[] __initdata = {
148+ {
149+ .modalias = "mmc_spi",
150+#ifdef MMC_CHIP_SELECT_GPIO
151+ .controller_data = &simone_mmc_spi_ops,
152+#endif
153+ .platform_data = &simone_mmc_spi_data,
154+ /*
155+ * We use 10 MHz even though the maximum is 3.7 MHz. The driver
156+ * will limit it automatically to max. frequency.
157+ */
158+ .max_speed_hz = 10 * 1000 * 1000,
159+ .bus_num = 0,
160+ .chip_select = 0,
161+ .mode = SPI_MODE_3,
162+ },
163+};
164+
165+static struct ep93xx_spi_info simone_spi_info __initdata = {
166+ .num_chipselect = ARRAY_SIZE(simone_spi_devices),
167+};
168+
169 static struct i2c_gpio_platform_data __initdata simone_i2c_gpio_data = {
170     .sda_pin = EP93XX_GPIO_LINE_EEDAT,
171     .sda_is_open_drain = 0,
172@@ -75,6 +209,8 @@ static void __init simone_init_machine(v
173     ep93xx_register_fb(&simone_fb_info);
174     ep93xx_register_i2c(&simone_i2c_gpio_data, simone_i2c_board_info,
175                 ARRAY_SIZE(simone_i2c_board_info));
176+ ep93xx_register_spi(&simone_spi_info, simone_spi_devices,
177+ ARRAY_SIZE(simone_spi_devices));
178     simone_register_audio();
179 }
180 
181

Archive Download this file

Branches:
backfire
history
master
release_2010-11-17
release_2010-12-14
release_2011-02-23
release_2011-05-28
release_2011-08-27
release_2011-11-13
release_2012-03-18
release_2012-04-09
release_2012-10-11
uclibc_nptl



interactive