[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mmc / host / of_mmc_spi.c

/*
 * OpenFirmware bindings for the MMC-over-SPI driver
 *
 * Copyright (c) MontaVista Software, Inc. 2008.
 *
 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/of.h>
#include <linux/of_gpio.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>

/* For archs that don't support NO_IRQ (such as mips), provide a dummy value */
#ifndef NO_IRQ
#define NO_IRQ 0
#endif

MODULE_LICENSE("GPL");

enum {
	CD_GPIO = 0,
	WP_GPIO,
	NUM_GPIOS,
};

struct of_mmc_spi {
	int gpios[NUM_GPIOS];
	bool alow_gpios[NUM_GPIOS];
	int detect_irq;
	struct mmc_spi_platform_data pdata;
};

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_read_gpio(struct device *dev, int gpio_num)
{
	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
	bool active_low = oms->alow_gpios[gpio_num];
	bool value = gpio_get_value(oms->gpios[gpio_num]);

	return active_low ^ value;
}

static int of_mmc_spi_get_cd(struct device *dev)
{
	return of_mmc_spi_read_gpio(dev, CD_GPIO);
}

static int of_mmc_spi_get_ro(struct device *dev)
{
	return of_mmc_spi_read_gpio(dev, WP_GPIO);
}

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, 0,
				    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 device *dev = &spi->dev;
	struct device_node *np = dev->of_node;
	struct of_mmc_spi *oms;
	const u32 *voltage_ranges;
	int num_ranges;
	int i;
	int ret = -EINVAL;

	if (dev->platform_data || !np)
		return dev->platform_data;

	oms = kzalloc(sizeof(*oms), GFP_KERNEL);
	if (!oms)
		return NULL;

	voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
	num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
	if (!voltage_ranges || !num_ranges) {
		dev_err(dev, "OF: voltage-ranges unspecified\n");
		goto err_ocr;
	}

	for (i = 0; i < num_ranges; i++) {
		const int j = i * 2;
		u32 mask;

		mask = mmc_vddrange_to_ocrmask(be32_to_cpu(voltage_ranges[j]),
					       be32_to_cpu(voltage_ranges[j + 1]));
		if (!mask) {
			ret = -EINVAL;
			dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
			goto err_ocr;
		}
		oms->pdata.ocr_mask |= mask;
	}

	for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
		enum of_gpio_flags gpio_flags;

		oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
		if (!gpio_is_valid(oms->gpios[i]))
			continue;

		ret = gpio_request(oms->gpios[i], dev_name(dev));
		if (ret < 0) {
			oms->gpios[i] = -EINVAL;
			continue;
		}

		if (gpio_flags & OF_GPIO_ACTIVE_LOW)
			oms->alow_gpios[i] = true;
	}

	if (gpio_is_valid(oms->gpios[CD_GPIO]))
		oms->pdata.get_cd = of_mmc_spi_get_cd;
	if (gpio_is_valid(oms->gpios[WP_GPIO]))
		oms->pdata.get_ro = of_mmc_spi_get_ro;

	oms->detect_irq = irq_of_parse_and_map(np, 0);
	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;
	}

	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 device_node *np = dev->of_node;
	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
	int i;

	if (!dev->platform_data || !np)
		return;

	for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
		if (gpio_is_valid(oms->gpios[i]))
			gpio_free(oms->gpios[i]);
	}
	kfree(oms);
	dev->platform_data = NULL;
}
EXPORT_SYMBOL(mmc_spi_put_pdata);
Commit	Line	Data
9c43df57 AV	1	/*
	2	* OpenFirmware bindings for the MMC-over-SPI driver
	3	*
	4	* Copyright (c) MontaVista Software, Inc. 2008.
	5	*
	6	* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the
	10	* Free Software Foundation; either version 2 of the License, or (at your
	11	* option) any later version.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/device.h>
5a0e3ad6	17	#include <linux/slab.h>
b2fce6ad	18	#include <linux/irq.h>
9c43df57 AV	19	#include <linux/gpio.h>
	20	#include <linux/of.h>
	21	#include <linux/of_gpio.h>
b2fce6ad	22	#include <linux/of_irq.h>
9c43df57 AV	23	#include <linux/spi/spi.h>
	24	#include <linux/spi/mmc_spi.h>
	25	#include <linux/mmc/core.h>
	26	#include <linux/mmc/host.h>
	27
b9c350a0 WG	28	/* For archs that don't support NO_IRQ (such as mips), provide a dummy value */
	29	#ifndef NO_IRQ
	30	#define NO_IRQ 0
	31	#endif
	32
02d9e58e GL	33	MODULE_LICENSE("GPL");
02d9e58e GL	34
9c43df57 AV	35	enum {
	36	CD_GPIO = 0,
	37	WP_GPIO,
	38	NUM_GPIOS,
	39	};
	40
	41	struct of_mmc_spi {
	42	int gpios[NUM_GPIOS];
	43	bool alow_gpios[NUM_GPIOS];
290293ed	44	int detect_irq;
9c43df57 AV	45	struct mmc_spi_platform_data pdata;
	46	};
	47
	48	static struct of_mmc_spi to_of_mmc_spi(struct device dev)
	49	{
	50	return container_of(dev->platform_data, struct of_mmc_spi, pdata);
	51	}
	52
	53	static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num)
	54	{
	55	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
	56	bool active_low = oms->alow_gpios[gpio_num];
	57	bool value = gpio_get_value(oms->gpios[gpio_num]);
	58
	59	return active_low ^ value;
	60	}
	61
	62	static int of_mmc_spi_get_cd(struct device *dev)
	63	{
	64	return of_mmc_spi_read_gpio(dev, CD_GPIO);
	65	}
	66
	67	static int of_mmc_spi_get_ro(struct device *dev)
	68	{
	69	return of_mmc_spi_read_gpio(dev, WP_GPIO);
	70	}
	71
290293ed EH	72	static int of_mmc_spi_init(struct device *dev,
	73	irqreturn_t (irqhandler)(int, void ), void *mmc)
	74	{
	75	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
	76
	77	return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 0,
	78	dev_name(dev), mmc);
	79	}
	80
	81	static void of_mmc_spi_exit(struct device dev, void mmc)
	82	{
	83	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
	84
	85	free_irq(oms->detect_irq, mmc);
	86	}
	87
9c43df57 AV	88	struct mmc_spi_platform_data mmc_spi_get_pdata(struct spi_device spi)
	89	{
	90	struct device *dev = &spi->dev;
61c7a080	91	struct device_node *np = dev->of_node;
9c43df57 AV	92	struct of_mmc_spi *oms;
	93	const u32 *voltage_ranges;
	94	int num_ranges;
	95	int i;
	96	int ret = -EINVAL;
	97
	98	if (dev->platform_data \|\| !np)
	99	return dev->platform_data;
	100
	101	oms = kzalloc(sizeof(*oms), GFP_KERNEL);
	102	if (!oms)
	103	return NULL;
	104
	105	voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
	106	num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
	107	if (!voltage_ranges \|\| !num_ranges) {
	108	dev_err(dev, "OF: voltage-ranges unspecified\n");
	109	goto err_ocr;
	110	}
	111
	112	for (i = 0; i < num_ranges; i++) {
	113	const int j = i * 2;
	114	u32 mask;
	115
b6bf30d9 JCPV	116	mask = mmc_vddrange_to_ocrmask(be32_to_cpu(voltage_ranges[j]),
b6bf30d9 JCPV	117	be32_to_cpu(voltage_ranges[j + 1]));
9c43df57 AV	118	if (!mask) {
	119	ret = -EINVAL;
	120	dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
	121	goto err_ocr;
	122	}
	123	oms->pdata.ocr_mask \|= mask;
	124	}
	125
	126	for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
	127	enum of_gpio_flags gpio_flags;
	128
	129	oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
	130	if (!gpio_is_valid(oms->gpios[i]))
	131	continue;
	132
48f8151e	133	ret = gpio_request(oms->gpios[i], dev_name(dev));
9c43df57 AV	134	if (ret < 0) {
	135	oms->gpios[i] = -EINVAL;
	136	continue;
	137	}
	138
	139	if (gpio_flags & OF_GPIO_ACTIVE_LOW)
	140	oms->alow_gpios[i] = true;
	141	}
	142
	143	if (gpio_is_valid(oms->gpios[CD_GPIO]))
	144	oms->pdata.get_cd = of_mmc_spi_get_cd;
	145	if (gpio_is_valid(oms->gpios[WP_GPIO]))
	146	oms->pdata.get_ro = of_mmc_spi_get_ro;
	147
290293ed	148	oms->detect_irq = irq_of_parse_and_map(np, 0);
073350f7	149	if (oms->detect_irq != 0) {
290293ed EH	150	oms->pdata.init = of_mmc_spi_init;
	151	oms->pdata.exit = of_mmc_spi_exit;
	152	} else {
	153	oms->pdata.caps \|= MMC_CAP_NEEDS_POLL;
	154	}
9c43df57 AV	155
	156	dev->platform_data = &oms->pdata;
	157	return dev->platform_data;
	158	err_ocr:
	159	kfree(oms);
	160	return NULL;
	161	}
	162	EXPORT_SYMBOL(mmc_spi_get_pdata);
	163
	164	void mmc_spi_put_pdata(struct spi_device *spi)
	165	{
	166	struct device *dev = &spi->dev;
61c7a080	167	struct device_node *np = dev->of_node;
9c43df57 AV	168	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
	169	int i;
	170
	171	if (!dev->platform_data \|\| !np)
	172	return;
	173
	174	for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
	175	if (gpio_is_valid(oms->gpios[i]))
	176	gpio_free(oms->gpios[i]);
	177	}
	178	kfree(oms);
	179	dev->platform_data = NULL;
	180	}
	181	EXPORT_SYMBOL(mmc_spi_put_pdata);