of_mmc_spi.c

 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_DESCRIPTION("OpenFirmware bindings for the MMC-over-SPI driver");
23MODULE_LICENSE("GPL");
24
25struct of_mmc_spi {
26	struct mmc_spi_platform_data pdata;
27	int detect_irq;
28};
29
30static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
31{
32	return container_of(dev->platform_data, struct of_mmc_spi, pdata);
33}
34
35static int of_mmc_spi_init(struct device *dev,
36			   irqreturn_t (*irqhandler)(int, void *), void *mmc)
37{
38	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
39
40	return request_threaded_irq(oms->detect_irq, NULL, irqhandler,
41					IRQF_ONESHOT, dev_name(dev), mmc);
42}
43
44static void of_mmc_spi_exit(struct device *dev, void *mmc)
45{
46	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
47
48	free_irq(oms->detect_irq, mmc);
49}
50
51struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
52{
53	struct mmc_host *mmc = dev_get_drvdata(&spi->dev);
54	struct device *dev = &spi->dev;
55	struct of_mmc_spi *oms;
56
57	if (dev->platform_data || !dev_fwnode(dev))
58		return dev->platform_data;
59
60	oms = kzalloc(sizeof(*oms), GFP_KERNEL);
61	if (!oms)
62		return NULL;
63
64	if (mmc_of_parse_voltage(mmc, &oms->pdata.ocr_mask) < 0)
65		goto err_ocr;
66
67	oms->detect_irq = spi->irq;
68	if (oms->detect_irq > 0) {
69		oms->pdata.init = of_mmc_spi_init;
70		oms->pdata.exit = of_mmc_spi_exit;
71	} else {
72		oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
73	}
74	if (device_property_read_bool(dev, "cap-sd-highspeed"))
75		oms->pdata.caps |= MMC_CAP_SD_HIGHSPEED;
76	if (device_property_read_bool(dev, "cap-mmc-highspeed"))
77		oms->pdata.caps |= MMC_CAP_MMC_HIGHSPEED;
78
79	dev->platform_data = &oms->pdata;
80	return dev->platform_data;
81err_ocr:
82	kfree(oms);
83	return NULL;
84}
85EXPORT_SYMBOL(mmc_spi_get_pdata);
86
87void mmc_spi_put_pdata(struct spi_device *spi)
88{
89	struct device *dev = &spi->dev;
90	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
91
92	if (!dev->platform_data || !dev_fwnode(dev))
93		return;
94
95	kfree(oms);
96	dev->platform_data = NULL;
97}
98EXPORT_SYMBOL(mmc_spi_put_pdata);