1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * OpenFirmware bindings for the MMC-over-SPI driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) MontaVista Software, Inc. 2008.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/module.h>
12*4882a593Smuzhiyun #include <linux/device.h>
13*4882a593Smuzhiyun #include <linux/slab.h>
14*4882a593Smuzhiyun #include <linux/irq.h>
15*4882a593Smuzhiyun #include <linux/of.h>
16*4882a593Smuzhiyun #include <linux/of_irq.h>
17*4882a593Smuzhiyun #include <linux/spi/spi.h>
18*4882a593Smuzhiyun #include <linux/spi/mmc_spi.h>
19*4882a593Smuzhiyun #include <linux/mmc/core.h>
20*4882a593Smuzhiyun #include <linux/mmc/host.h>
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun /* For archs that don't support NO_IRQ (such as mips), provide a dummy value */
23*4882a593Smuzhiyun #ifndef NO_IRQ
24*4882a593Smuzhiyun #define NO_IRQ 0
25*4882a593Smuzhiyun #endif
26*4882a593Smuzhiyun
27*4882a593Smuzhiyun MODULE_LICENSE("GPL");
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun struct of_mmc_spi {
30*4882a593Smuzhiyun int detect_irq;
31*4882a593Smuzhiyun struct mmc_spi_platform_data pdata;
32*4882a593Smuzhiyun };
33*4882a593Smuzhiyun
to_of_mmc_spi(struct device * dev)34*4882a593Smuzhiyun static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
35*4882a593Smuzhiyun {
36*4882a593Smuzhiyun return container_of(dev->platform_data, struct of_mmc_spi, pdata);
37*4882a593Smuzhiyun }
38*4882a593Smuzhiyun
of_mmc_spi_init(struct device * dev,irqreturn_t (* irqhandler)(int,void *),void * mmc)39*4882a593Smuzhiyun static int of_mmc_spi_init(struct device *dev,
40*4882a593Smuzhiyun irqreturn_t (*irqhandler)(int, void *), void *mmc)
41*4882a593Smuzhiyun {
42*4882a593Smuzhiyun struct of_mmc_spi *oms = to_of_mmc_spi(dev);
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun return request_threaded_irq(oms->detect_irq, NULL, irqhandler,
45*4882a593Smuzhiyun IRQF_ONESHOT, dev_name(dev), mmc);
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
of_mmc_spi_exit(struct device * dev,void * mmc)48*4882a593Smuzhiyun static void of_mmc_spi_exit(struct device *dev, void *mmc)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun struct of_mmc_spi *oms = to_of_mmc_spi(dev);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun free_irq(oms->detect_irq, mmc);
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun
mmc_spi_get_pdata(struct spi_device * spi)55*4882a593Smuzhiyun struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun struct device *dev = &spi->dev;
58*4882a593Smuzhiyun struct device_node *np = dev->of_node;
59*4882a593Smuzhiyun struct of_mmc_spi *oms;
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun if (dev->platform_data || !np)
62*4882a593Smuzhiyun return dev->platform_data;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun oms = kzalloc(sizeof(*oms), GFP_KERNEL);
65*4882a593Smuzhiyun if (!oms)
66*4882a593Smuzhiyun return NULL;
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun if (mmc_of_parse_voltage(np, &oms->pdata.ocr_mask) <= 0)
69*4882a593Smuzhiyun goto err_ocr;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun oms->detect_irq = irq_of_parse_and_map(np, 0);
72*4882a593Smuzhiyun if (oms->detect_irq != 0) {
73*4882a593Smuzhiyun oms->pdata.init = of_mmc_spi_init;
74*4882a593Smuzhiyun oms->pdata.exit = of_mmc_spi_exit;
75*4882a593Smuzhiyun } else {
76*4882a593Smuzhiyun oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun dev->platform_data = &oms->pdata;
80*4882a593Smuzhiyun return dev->platform_data;
81*4882a593Smuzhiyun err_ocr:
82*4882a593Smuzhiyun kfree(oms);
83*4882a593Smuzhiyun return NULL;
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun EXPORT_SYMBOL(mmc_spi_get_pdata);
86*4882a593Smuzhiyun
mmc_spi_put_pdata(struct spi_device * spi)87*4882a593Smuzhiyun void mmc_spi_put_pdata(struct spi_device *spi)
88*4882a593Smuzhiyun {
89*4882a593Smuzhiyun struct device *dev = &spi->dev;
90*4882a593Smuzhiyun struct device_node *np = dev->of_node;
91*4882a593Smuzhiyun struct of_mmc_spi *oms = to_of_mmc_spi(dev);
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun if (!dev->platform_data || !np)
94*4882a593Smuzhiyun return;
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun kfree(oms);
97*4882a593Smuzhiyun dev->platform_data = NULL;
98*4882a593Smuzhiyun }
99*4882a593Smuzhiyun EXPORT_SYMBOL(mmc_spi_put_pdata);
100