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(irq: oms->detect_irq, NULL, thread_fn: irqhandler,
40 IRQF_ONESHOT, name: dev_name(dev), 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(dev: &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(size: sizeof(*oms), GFP_KERNEL);
60 if (!oms)
61 return NULL;
62
63 if (mmc_of_parse_voltage(host: mmc, mask: &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, propname: "cap-sd-highspeed"))
74 oms->pdata.caps |= MMC_CAP_SD_HIGHSPEED;
75 if (device_property_read_bool(dev, propname: "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(objp: 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(objp: oms);
95 dev->platform_data = NULL;
96}
97EXPORT_SYMBOL(mmc_spi_put_pdata);
98

source code of linux/drivers/mmc/host/of_mmc_spi.c