2 * OpenFirmware bindings for the MMC-over-SPI driver
4 * Copyright (c) MontaVista Software, Inc. 2008.
6 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/device.h>
17 #include <linux/gpio.h>
19 #include <linux/of_gpio.h>
20 #include <linux/spi/spi.h>
21 #include <linux/spi/mmc_spi.h>
22 #include <linux/mmc/core.h>
23 #include <linux/mmc/host.h>
25 MODULE_LICENSE("GPL");
35 bool alow_gpios[NUM_GPIOS];
36 struct mmc_spi_platform_data pdata;
39 static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
41 return container_of(dev->platform_data, struct of_mmc_spi, pdata);
44 static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num)
46 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
47 bool active_low = oms->alow_gpios[gpio_num];
48 bool value = gpio_get_value(oms->gpios[gpio_num]);
50 return active_low ^ value;
53 static int of_mmc_spi_get_cd(struct device *dev)
55 return of_mmc_spi_read_gpio(dev, CD_GPIO);
58 static int of_mmc_spi_get_ro(struct device *dev)
60 return of_mmc_spi_read_gpio(dev, WP_GPIO);
63 struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
65 struct device *dev = &spi->dev;
66 struct device_node *np = dev_archdata_get_node(&dev->archdata);
67 struct of_mmc_spi *oms;
68 const u32 *voltage_ranges;
73 if (dev->platform_data || !np)
74 return dev->platform_data;
76 oms = kzalloc(sizeof(*oms), GFP_KERNEL);
80 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
81 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
82 if (!voltage_ranges || !num_ranges) {
83 dev_err(dev, "OF: voltage-ranges unspecified\n");
87 for (i = 0; i < num_ranges; i++) {
91 mask = mmc_vddrange_to_ocrmask(voltage_ranges[j],
92 voltage_ranges[j + 1]);
95 dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
98 oms->pdata.ocr_mask |= mask;
101 for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
102 enum of_gpio_flags gpio_flags;
104 oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
105 if (!gpio_is_valid(oms->gpios[i]))
108 ret = gpio_request(oms->gpios[i], dev_name(dev));
110 oms->gpios[i] = -EINVAL;
114 if (gpio_flags & OF_GPIO_ACTIVE_LOW)
115 oms->alow_gpios[i] = true;
118 if (gpio_is_valid(oms->gpios[CD_GPIO]))
119 oms->pdata.get_cd = of_mmc_spi_get_cd;
120 if (gpio_is_valid(oms->gpios[WP_GPIO]))
121 oms->pdata.get_ro = of_mmc_spi_get_ro;
123 /* We don't support interrupts yet, let's poll. */
124 oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
126 dev->platform_data = &oms->pdata;
127 return dev->platform_data;
132 EXPORT_SYMBOL(mmc_spi_get_pdata);
134 void mmc_spi_put_pdata(struct spi_device *spi)
136 struct device *dev = &spi->dev;
137 struct device_node *np = dev_archdata_get_node(&dev->archdata);
138 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
141 if (!dev->platform_data || !np)
144 for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
145 if (gpio_is_valid(oms->gpios[i]))
146 gpio_free(oms->gpios[i]);
149 dev->platform_data = NULL;
151 EXPORT_SYMBOL(mmc_spi_put_pdata);