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
22/* For archs that don't support NO_IRQ (such as mips), provide a dummy value */
23#ifndef NO_IRQ
24#define NO_IRQ 0
25#endif
26
27MODULE_LICENSE("GPL");
28
29struct of_mmc_spi {
30	int detect_irq;
31	struct mmc_spi_platform_data pdata;
32};
33
34static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
35{
36	return container_of(dev->platform_data, struct of_mmc_spi, pdata);
37}
38
39static int of_mmc_spi_init(struct device *dev,
40			   irqreturn_t (*irqhandler)(int, void *), void *mmc)
41{
42	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
43
44	return request_threaded_irq(oms->detect_irq, NULL, irqhandler,
45					IRQF_ONESHOT, dev_name(dev), mmc);
46}
47
48static void of_mmc_spi_exit(struct device *dev, void *mmc)
49{
50	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
51
52	free_irq(oms->detect_irq, mmc);
53}
54
55struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
56{
57	struct device *dev = &spi->dev;
58	struct device_node *np = dev->of_node;
59	struct of_mmc_spi *oms;
60
61	if (dev->platform_data || !np)
62		return dev->platform_data;
63
64	oms = kzalloc(sizeof(*oms), GFP_KERNEL);
65	if (!oms)
66		return NULL;
67
68	if (mmc_of_parse_voltage(np, &oms->pdata.ocr_mask) <= 0)
69		goto err_ocr;
70
71	oms->detect_irq = irq_of_parse_and_map(np, 0);
72	if (oms->detect_irq != 0) {
73		oms->pdata.init = of_mmc_spi_init;
74		oms->pdata.exit = of_mmc_spi_exit;
75	} else {
76		oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
77	}
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 device_node *np = dev->of_node;
91	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
92
93	if (!dev->platform_data || !np)
94		return;
95
96	kfree(oms);
97	dev->platform_data = NULL;
98}
99EXPORT_SYMBOL(mmc_spi_put_pdata);
100