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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * OpenFirmware bindings for the MMC-over-SPI driver
4 *
5 * Copyright (c) MontaVista Software, Inc. 2008.
6 *
7 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/device.h>
13#include <linux/slab.h>
14#include <linux/irq.h>
15#include <linux/of.h>
16#include <linux/of_irq.h>
17#include <linux/spi/spi.h>
18#include <linux/spi/mmc_spi.h>
19#include <linux/mmc/core.h>
20#include <linux/mmc/host.h>
21
22MODULE_LICENSE("GPL");
23
24struct of_mmc_spi {
25 struct mmc_spi_platform_data pdata;
26 int detect_irq;
27};
28
29static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
30{
31 return container_of(dev->platform_data, struct of_mmc_spi, pdata);
32}
33
34static int of_mmc_spi_init(struct device *dev,
35 irqreturn_t (*irqhandler)(int, void *), void *mmc)
36{
37 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
38
39 return request_threaded_irq(oms->detect_irq, NULL, irqhandler,
40 IRQF_ONESHOT, dev_name(dev), mmc);
41}
42
43static void of_mmc_spi_exit(struct device *dev, void *mmc)
44{
45 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
46
47 free_irq(oms->detect_irq, mmc);
48}
49
50struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
51{
52 struct mmc_host *mmc = dev_get_drvdata(&spi->dev);
53 struct device *dev = &spi->dev;
54 struct of_mmc_spi *oms;
55
56 if (dev->platform_data || !dev_fwnode(dev))
57 return dev->platform_data;
58
59 oms = kzalloc(sizeof(*oms), GFP_KERNEL);
60 if (!oms)
61 return NULL;
62
63 if (mmc_of_parse_voltage(mmc, &oms->pdata.ocr_mask) < 0)
64 goto err_ocr;
65
66 oms->detect_irq = spi->irq;
67 if (oms->detect_irq > 0) {
68 oms->pdata.init = of_mmc_spi_init;
69 oms->pdata.exit = of_mmc_spi_exit;
70 } else {
71 oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
72 }
73 if (device_property_read_bool(dev, "cap-sd-highspeed"))
74 oms->pdata.caps |= MMC_CAP_SD_HIGHSPEED;
75 if (device_property_read_bool(dev, "cap-mmc-highspeed"))
76 oms->pdata.caps |= MMC_CAP_MMC_HIGHSPEED;
77
78 dev->platform_data = &oms->pdata;
79 return dev->platform_data;
80err_ocr:
81 kfree(oms);
82 return NULL;
83}
84EXPORT_SYMBOL(mmc_spi_get_pdata);
85
86void mmc_spi_put_pdata(struct spi_device *spi)
87{
88 struct device *dev = &spi->dev;
89 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
90
91 if (!dev->platform_data || !dev_fwnode(dev))
92 return;
93
94 kfree(oms);
95 dev->platform_data = NULL;
96}
97EXPORT_SYMBOL(mmc_spi_put_pdata);
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>
17#include <linux/slab.h>
18#include <linux/irq.h>
19#include <linux/gpio.h>
20#include <linux/of.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>
27
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
33MODULE_LICENSE("GPL");
34
35enum {
36 CD_GPIO = 0,
37 WP_GPIO,
38 NUM_GPIOS,
39};
40
41struct of_mmc_spi {
42 int gpios[NUM_GPIOS];
43 bool alow_gpios[NUM_GPIOS];
44 int detect_irq;
45 struct mmc_spi_platform_data pdata;
46};
47
48static 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
53static int of_mmc_spi_init(struct device *dev,
54 irqreturn_t (*irqhandler)(int, void *), void *mmc)
55{
56 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
57
58 return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 0,
59 dev_name(dev), mmc);
60}
61
62static void of_mmc_spi_exit(struct device *dev, void *mmc)
63{
64 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
65
66 free_irq(oms->detect_irq, mmc);
67}
68
69struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
70{
71 struct device *dev = &spi->dev;
72 struct device_node *np = dev->of_node;
73 struct of_mmc_spi *oms;
74 const u32 *voltage_ranges;
75 int num_ranges;
76 int i;
77 int ret = -EINVAL;
78
79 if (dev->platform_data || !np)
80 return dev->platform_data;
81
82 oms = kzalloc(sizeof(*oms), GFP_KERNEL);
83 if (!oms)
84 return NULL;
85
86 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
87 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
88 if (!voltage_ranges || !num_ranges) {
89 dev_err(dev, "OF: voltage-ranges unspecified\n");
90 goto err_ocr;
91 }
92
93 for (i = 0; i < num_ranges; i++) {
94 const int j = i * 2;
95 u32 mask;
96
97 mask = mmc_vddrange_to_ocrmask(be32_to_cpu(voltage_ranges[j]),
98 be32_to_cpu(voltage_ranges[j + 1]));
99 if (!mask) {
100 ret = -EINVAL;
101 dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
102 goto err_ocr;
103 }
104 oms->pdata.ocr_mask |= mask;
105 }
106
107 for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
108 enum of_gpio_flags gpio_flags;
109
110 oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
111 if (!gpio_is_valid(oms->gpios[i]))
112 continue;
113
114 if (gpio_flags & OF_GPIO_ACTIVE_LOW)
115 oms->alow_gpios[i] = true;
116 }
117
118 if (gpio_is_valid(oms->gpios[CD_GPIO])) {
119 oms->pdata.cd_gpio = oms->gpios[CD_GPIO];
120 oms->pdata.flags |= MMC_SPI_USE_CD_GPIO;
121 if (!oms->alow_gpios[CD_GPIO])
122 oms->pdata.caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
123 }
124 if (gpio_is_valid(oms->gpios[WP_GPIO])) {
125 oms->pdata.ro_gpio = oms->gpios[WP_GPIO];
126 oms->pdata.flags |= MMC_SPI_USE_RO_GPIO;
127 if (!oms->alow_gpios[WP_GPIO])
128 oms->pdata.caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
129 }
130
131 oms->detect_irq = irq_of_parse_and_map(np, 0);
132 if (oms->detect_irq != 0) {
133 oms->pdata.init = of_mmc_spi_init;
134 oms->pdata.exit = of_mmc_spi_exit;
135 } else {
136 oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
137 }
138
139 dev->platform_data = &oms->pdata;
140 return dev->platform_data;
141err_ocr:
142 kfree(oms);
143 return NULL;
144}
145EXPORT_SYMBOL(mmc_spi_get_pdata);
146
147void mmc_spi_put_pdata(struct spi_device *spi)
148{
149 struct device *dev = &spi->dev;
150 struct device_node *np = dev->of_node;
151 struct of_mmc_spi *oms = to_of_mmc_spi(dev);
152
153 if (!dev->platform_data || !np)
154 return;
155
156 kfree(oms);
157 dev->platform_data = NULL;
158}
159EXPORT_SYMBOL(mmc_spi_put_pdata);