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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 | ||
b9c350a0 WG |
28 | /* For archs that don't support NO_IRQ (such as mips), provide a dummy value */ |
29 | #ifndef NO_IRQ | |
30 | #define NO_IRQ 0 | |
31 | #endif | |
32 | ||
02d9e58e GL |
33 | MODULE_LICENSE("GPL"); |
34 | ||
9c43df57 AV |
35 | enum { |
36 | CD_GPIO = 0, | |
37 | WP_GPIO, | |
38 | NUM_GPIOS, | |
39 | }; | |
40 | ||
41 | struct of_mmc_spi { | |
42 | int gpios[NUM_GPIOS]; | |
43 | bool alow_gpios[NUM_GPIOS]; | |
290293ed | 44 | int detect_irq; |
9c43df57 AV |
45 | struct mmc_spi_platform_data pdata; |
46 | }; | |
47 | ||
48 | static struct of_mmc_spi *to_of_mmc_spi(struct device *dev) | |
49 | { | |
50 | return container_of(dev->platform_data, struct of_mmc_spi, pdata); | |
51 | } | |
52 | ||
53 | static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num) | |
54 | { | |
55 | struct of_mmc_spi *oms = to_of_mmc_spi(dev); | |
56 | bool active_low = oms->alow_gpios[gpio_num]; | |
57 | bool value = gpio_get_value(oms->gpios[gpio_num]); | |
58 | ||
59 | return active_low ^ value; | |
60 | } | |
61 | ||
62 | static int of_mmc_spi_get_cd(struct device *dev) | |
63 | { | |
64 | return of_mmc_spi_read_gpio(dev, CD_GPIO); | |
65 | } | |
66 | ||
67 | static int of_mmc_spi_get_ro(struct device *dev) | |
68 | { | |
69 | return of_mmc_spi_read_gpio(dev, WP_GPIO); | |
70 | } | |
71 | ||
290293ed EH |
72 | static int of_mmc_spi_init(struct device *dev, |
73 | irqreturn_t (*irqhandler)(int, void *), void *mmc) | |
74 | { | |
75 | struct of_mmc_spi *oms = to_of_mmc_spi(dev); | |
76 | ||
77 | return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 0, | |
78 | dev_name(dev), mmc); | |
79 | } | |
80 | ||
81 | static void of_mmc_spi_exit(struct device *dev, void *mmc) | |
82 | { | |
83 | struct of_mmc_spi *oms = to_of_mmc_spi(dev); | |
84 | ||
85 | free_irq(oms->detect_irq, mmc); | |
86 | } | |
87 | ||
9c43df57 AV |
88 | struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi) |
89 | { | |
90 | struct device *dev = &spi->dev; | |
61c7a080 | 91 | struct device_node *np = dev->of_node; |
9c43df57 AV |
92 | struct of_mmc_spi *oms; |
93 | const u32 *voltage_ranges; | |
94 | int num_ranges; | |
95 | int i; | |
96 | int ret = -EINVAL; | |
97 | ||
98 | if (dev->platform_data || !np) | |
99 | return dev->platform_data; | |
100 | ||
101 | oms = kzalloc(sizeof(*oms), GFP_KERNEL); | |
102 | if (!oms) | |
103 | return NULL; | |
104 | ||
105 | voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges); | |
106 | num_ranges = num_ranges / sizeof(*voltage_ranges) / 2; | |
107 | if (!voltage_ranges || !num_ranges) { | |
108 | dev_err(dev, "OF: voltage-ranges unspecified\n"); | |
109 | goto err_ocr; | |
110 | } | |
111 | ||
112 | for (i = 0; i < num_ranges; i++) { | |
113 | const int j = i * 2; | |
114 | u32 mask; | |
115 | ||
116 | mask = mmc_vddrange_to_ocrmask(voltage_ranges[j], | |
117 | voltage_ranges[j + 1]); | |
118 | if (!mask) { | |
119 | ret = -EINVAL; | |
120 | dev_err(dev, "OF: voltage-range #%d is invalid\n", i); | |
121 | goto err_ocr; | |
122 | } | |
123 | oms->pdata.ocr_mask |= mask; | |
124 | } | |
125 | ||
126 | for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) { | |
127 | enum of_gpio_flags gpio_flags; | |
128 | ||
129 | oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags); | |
130 | if (!gpio_is_valid(oms->gpios[i])) | |
131 | continue; | |
132 | ||
48f8151e | 133 | ret = gpio_request(oms->gpios[i], dev_name(dev)); |
9c43df57 AV |
134 | if (ret < 0) { |
135 | oms->gpios[i] = -EINVAL; | |
136 | continue; | |
137 | } | |
138 | ||
139 | if (gpio_flags & OF_GPIO_ACTIVE_LOW) | |
140 | oms->alow_gpios[i] = true; | |
141 | } | |
142 | ||
143 | if (gpio_is_valid(oms->gpios[CD_GPIO])) | |
144 | oms->pdata.get_cd = of_mmc_spi_get_cd; | |
145 | if (gpio_is_valid(oms->gpios[WP_GPIO])) | |
146 | oms->pdata.get_ro = of_mmc_spi_get_ro; | |
147 | ||
290293ed EH |
148 | oms->detect_irq = irq_of_parse_and_map(np, 0); |
149 | if (oms->detect_irq != NO_IRQ) { | |
150 | oms->pdata.init = of_mmc_spi_init; | |
151 | oms->pdata.exit = of_mmc_spi_exit; | |
152 | } else { | |
153 | oms->pdata.caps |= MMC_CAP_NEEDS_POLL; | |
154 | } | |
9c43df57 AV |
155 | |
156 | dev->platform_data = &oms->pdata; | |
157 | return dev->platform_data; | |
158 | err_ocr: | |
159 | kfree(oms); | |
160 | return NULL; | |
161 | } | |
162 | EXPORT_SYMBOL(mmc_spi_get_pdata); | |
163 | ||
164 | void mmc_spi_put_pdata(struct spi_device *spi) | |
165 | { | |
166 | struct device *dev = &spi->dev; | |
61c7a080 | 167 | struct device_node *np = dev->of_node; |
9c43df57 AV |
168 | struct of_mmc_spi *oms = to_of_mmc_spi(dev); |
169 | int i; | |
170 | ||
171 | if (!dev->platform_data || !np) | |
172 | return; | |
173 | ||
174 | for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) { | |
175 | if (gpio_is_valid(oms->gpios[i])) | |
176 | gpio_free(oms->gpios[i]); | |
177 | } | |
178 | kfree(oms); | |
179 | dev->platform_data = NULL; | |
180 | } | |
181 | EXPORT_SYMBOL(mmc_spi_put_pdata); |