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/slab.h>
18 #include <linux/irq.h>
19 #include <linux/gpio.h>
21 #include <linux/of_gpio.h>
22 #include <linux/of_irq.h>
23 #include <linux/spi/spi.h>
24 #include <linux/spi/mmc_spi.h>
25 #include <linux/mmc/core.h>
26 #include <linux/mmc/host.h>
28 MODULE_LICENSE("GPL");
38 bool alow_gpios[NUM_GPIOS];
40 struct mmc_spi_platform_data pdata;
43 static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
45 return container_of(dev->platform_data, struct of_mmc_spi, pdata);
48 static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num)
50 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
51 bool active_low = oms->alow_gpios[gpio_num];
52 bool value = gpio_get_value(oms->gpios[gpio_num]);
54 return active_low ^ value;
57 static int of_mmc_spi_get_cd(struct device *dev)
59 return of_mmc_spi_read_gpio(dev, CD_GPIO);
62 static int of_mmc_spi_get_ro(struct device *dev)
64 return of_mmc_spi_read_gpio(dev, WP_GPIO);
67 static int of_mmc_spi_init(struct device *dev,
68 irqreturn_t (*irqhandler)(int, void *), void *mmc)
70 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
72 return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 0,
76 static void of_mmc_spi_exit(struct device *dev, void *mmc)
78 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
80 free_irq(oms->detect_irq, mmc);
83 struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
85 struct device *dev = &spi->dev;
86 struct device_node *np = dev->of_node;
87 struct of_mmc_spi *oms;
88 const u32 *voltage_ranges;
93 if (dev->platform_data || !np)
94 return dev->platform_data;
96 oms = kzalloc(sizeof(*oms), GFP_KERNEL);
100 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
101 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
102 if (!voltage_ranges || !num_ranges) {
103 dev_err(dev, "OF: voltage-ranges unspecified\n");
107 for (i = 0; i < num_ranges; i++) {
111 mask = mmc_vddrange_to_ocrmask(voltage_ranges[j],
112 voltage_ranges[j + 1]);
115 dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
118 oms->pdata.ocr_mask |= mask;
121 for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
122 enum of_gpio_flags gpio_flags;
124 oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
125 if (!gpio_is_valid(oms->gpios[i]))
128 ret = gpio_request(oms->gpios[i], dev_name(dev));
130 oms->gpios[i] = -EINVAL;
134 if (gpio_flags & OF_GPIO_ACTIVE_LOW)
135 oms->alow_gpios[i] = true;
138 if (gpio_is_valid(oms->gpios[CD_GPIO]))
139 oms->pdata.get_cd = of_mmc_spi_get_cd;
140 if (gpio_is_valid(oms->gpios[WP_GPIO]))
141 oms->pdata.get_ro = of_mmc_spi_get_ro;
143 oms->detect_irq = irq_of_parse_and_map(np, 0);
144 if (oms->detect_irq != NO_IRQ) {
145 oms->pdata.init = of_mmc_spi_init;
146 oms->pdata.exit = of_mmc_spi_exit;
148 oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
151 dev->platform_data = &oms->pdata;
152 return dev->platform_data;
157 EXPORT_SYMBOL(mmc_spi_get_pdata);
159 void mmc_spi_put_pdata(struct spi_device *spi)
161 struct device *dev = &spi->dev;
162 struct device_node *np = dev->of_node;
163 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
166 if (!dev->platform_data || !np)
169 for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
170 if (gpio_is_valid(oms->gpios[i]))
171 gpio_free(oms->gpios[i]);
174 dev->platform_data = NULL;
176 EXPORT_SYMBOL(mmc_spi_put_pdata);