1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OpenFirmware bindings for the MMC-over-SPI driver
*
* Copyright (c) MontaVista Software, Inc. 2008.
*
* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/spi/spi.h>
#include <linux/spi/mmc_spi.h>
#include <linux/mmc/core.h>
#include <linux/mmc/host.h>
MODULE_DESCRIPTION("OpenFirmware bindings for the MMC-over-SPI driver");
MODULE_LICENSE("GPL");
struct of_mmc_spi {
struct mmc_spi_platform_data pdata;
int detect_irq;
};
static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
{
return container_of(dev->platform_data, struct of_mmc_spi, pdata);
}
static int of_mmc_spi_init(struct device *dev,
irqreturn_t (*irqhandler)(int, void *), void *mmc)
{
struct of_mmc_spi *oms = to_of_mmc_spi(dev);
return request_threaded_irq(oms->detect_irq, NULL, irqhandler,
IRQF_ONESHOT, dev_name(dev), mmc);
}
static void of_mmc_spi_exit(struct device *dev, void *mmc)
{
struct of_mmc_spi *oms = to_of_mmc_spi(dev);
free_irq(oms->detect_irq, mmc);
}
struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
{
struct mmc_host *mmc = dev_get_drvdata(&spi->dev);
struct device *dev = &spi->dev;
struct of_mmc_spi *oms;
if (dev->platform_data || !dev_fwnode(dev))
return dev->platform_data;
oms = kzalloc(sizeof(*oms), GFP_KERNEL);
if (!oms)
return NULL;
if (mmc_of_parse_voltage(mmc, &oms->pdata.ocr_mask) < 0)
goto err_ocr;
oms->detect_irq = spi->irq;
if (oms->detect_irq > 0) {
oms->pdata.init = of_mmc_spi_init;
oms->pdata.exit = of_mmc_spi_exit;
} else {
oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
}
if (device_property_read_bool(dev, "cap-sd-highspeed"))
oms->pdata.caps |= MMC_CAP_SD_HIGHSPEED;
if (device_property_read_bool(dev, "cap-mmc-highspeed"))
oms->pdata.caps |= MMC_CAP_MMC_HIGHSPEED;
dev->platform_data = &oms->pdata;
return dev->platform_data;
err_ocr:
kfree(oms);
return NULL;
}
EXPORT_SYMBOL(mmc_spi_get_pdata);
void mmc_spi_put_pdata(struct spi_device *spi)
{
struct device *dev = &spi->dev;
struct of_mmc_spi *oms = to_of_mmc_spi(dev);
if (!dev->platform_data || !dev_fwnode(dev))
return;
kfree(oms);
dev->platform_data = NULL;
}
EXPORT_SYMBOL(mmc_spi_put_pdata);
|
