tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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);