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9c43df57 AV |
1 | /* |
2 | * OpenFirmware bindings for the MMC-over-SPI driver | |
3 | * | |
4 | * Copyright (c) MontaVista Software, Inc. 2008. | |
5 | * | |
6 | * Author: Anton Vorontsov <avorontsov@ru.mvista.com> | |
7 | * | |
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. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/device.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
b2fce6ad | 18 | #include <linux/irq.h> |
9c43df57 AV |
19 | #include <linux/gpio.h> |
20 | #include <linux/of.h> | |
21 | #include <linux/of_gpio.h> | |
b2fce6ad | 22 | #include <linux/of_irq.h> |
9c43df57 AV |
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> | |
27 | ||
02d9e58e GL |
28 | MODULE_LICENSE("GPL"); |
29 | ||
9c43df57 AV |
30 | enum { |
31 | CD_GPIO = 0, | |
32 | WP_GPIO, | |
33 | NUM_GPIOS, | |
34 | }; | |
35 | ||
36 | struct of_mmc_spi { | |
37 | int gpios[NUM_GPIOS]; | |
38 | bool alow_gpios[NUM_GPIOS]; | |
290293ed | 39 | int detect_irq; |
9c43df57 AV |
40 | struct mmc_spi_platform_data pdata; |
41 | }; | |
42 | ||
43 | static struct of_mmc_spi *to_of_mmc_spi(struct device *dev) | |
44 | { | |
45 | return container_of(dev->platform_data, struct of_mmc_spi, pdata); | |
46 | } | |
47 | ||
48 | static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num) | |
49 | { | |
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]); | |
53 | ||
54 | return active_low ^ value; | |
55 | } | |
56 | ||
57 | static int of_mmc_spi_get_cd(struct device *dev) | |
58 | { | |
59 | return of_mmc_spi_read_gpio(dev, CD_GPIO); | |
60 | } | |
61 | ||
62 | static int of_mmc_spi_get_ro(struct device *dev) | |
63 | { | |
64 | return of_mmc_spi_read_gpio(dev, WP_GPIO); | |
65 | } | |
66 | ||
290293ed EH |
67 | static int of_mmc_spi_init(struct device *dev, |
68 | irqreturn_t (*irqhandler)(int, void *), void *mmc) | |
69 | { | |
70 | struct of_mmc_spi *oms = to_of_mmc_spi(dev); | |
71 | ||
72 | return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 0, | |
73 | dev_name(dev), mmc); | |
74 | } | |
75 | ||
76 | static void of_mmc_spi_exit(struct device *dev, void *mmc) | |
77 | { | |
78 | struct of_mmc_spi *oms = to_of_mmc_spi(dev); | |
79 | ||
80 | free_irq(oms->detect_irq, mmc); | |
81 | } | |
82 | ||
9c43df57 AV |
83 | struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi) |
84 | { | |
85 | struct device *dev = &spi->dev; | |
61c7a080 | 86 | struct device_node *np = dev->of_node; |
9c43df57 AV |
87 | struct of_mmc_spi *oms; |
88 | const u32 *voltage_ranges; | |
89 | int num_ranges; | |
90 | int i; | |
91 | int ret = -EINVAL; | |
92 | ||
93 | if (dev->platform_data || !np) | |
94 | return dev->platform_data; | |
95 | ||
96 | oms = kzalloc(sizeof(*oms), GFP_KERNEL); | |
97 | if (!oms) | |
98 | return NULL; | |
99 | ||
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"); | |
104 | goto err_ocr; | |
105 | } | |
106 | ||
107 | for (i = 0; i < num_ranges; i++) { | |
108 | const int j = i * 2; | |
109 | u32 mask; | |
110 | ||
111 | mask = mmc_vddrange_to_ocrmask(voltage_ranges[j], | |
112 | voltage_ranges[j + 1]); | |
113 | if (!mask) { | |
114 | ret = -EINVAL; | |
115 | dev_err(dev, "OF: voltage-range #%d is invalid\n", i); | |
116 | goto err_ocr; | |
117 | } | |
118 | oms->pdata.ocr_mask |= mask; | |
119 | } | |
120 | ||
121 | for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) { | |
122 | enum of_gpio_flags gpio_flags; | |
123 | ||
124 | oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags); | |
125 | if (!gpio_is_valid(oms->gpios[i])) | |
126 | continue; | |
127 | ||
48f8151e | 128 | ret = gpio_request(oms->gpios[i], dev_name(dev)); |
9c43df57 AV |
129 | if (ret < 0) { |
130 | oms->gpios[i] = -EINVAL; | |
131 | continue; | |
132 | } | |
133 | ||
134 | if (gpio_flags & OF_GPIO_ACTIVE_LOW) | |
135 | oms->alow_gpios[i] = true; | |
136 | } | |
137 | ||
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; | |
142 | ||
290293ed EH |
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; | |
147 | } else { | |
148 | oms->pdata.caps |= MMC_CAP_NEEDS_POLL; | |
149 | } | |
9c43df57 AV |
150 | |
151 | dev->platform_data = &oms->pdata; | |
152 | return dev->platform_data; | |
153 | err_ocr: | |
154 | kfree(oms); | |
155 | return NULL; | |
156 | } | |
157 | EXPORT_SYMBOL(mmc_spi_get_pdata); | |
158 | ||
159 | void mmc_spi_put_pdata(struct spi_device *spi) | |
160 | { | |
161 | struct device *dev = &spi->dev; | |
61c7a080 | 162 | struct device_node *np = dev->of_node; |
9c43df57 AV |
163 | struct of_mmc_spi *oms = to_of_mmc_spi(dev); |
164 | int i; | |
165 | ||
166 | if (!dev->platform_data || !np) | |
167 | return; | |
168 | ||
169 | for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) { | |
170 | if (gpio_is_valid(oms->gpios[i])) | |
171 | gpio_free(oms->gpios[i]); | |
172 | } | |
173 | kfree(oms); | |
174 | dev->platform_data = NULL; | |
175 | } | |
176 | EXPORT_SYMBOL(mmc_spi_put_pdata); |