[deliverable/linux.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_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;

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

	if (gpio_is_valid(oms->gpios[CD_GPIO])) {
		oms->pdata.cd_gpio = oms->gpios[CD_GPIO];
		oms->pdata.flags |= MMC_SPI_USE_CD_GPIO;
		if (!oms->alow_gpios[CD_GPIO])
			oms->pdata.caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
	}
	if (gpio_is_valid(oms->gpios[WP_GPIO])) {
		oms->pdata.ro_gpio = oms->gpios[WP_GPIO];
		oms->pdata.flags |= MMC_SPI_USE_RO_GPIO;
		if (!oms->alow_gpios[WP_GPIO])
			oms->pdata.caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
	}

	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);

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

	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
290293ed EH	53	static int of_mmc_spi_init(struct device *dev,
	54	irqreturn_t (irqhandler)(int, void ), void *mmc)
	55	{
	56	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
	57
	58	return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 0,
	59	dev_name(dev), mmc);
	60	}
	61
	62	static void of_mmc_spi_exit(struct device dev, void mmc)
	63	{
	64	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
	65
	66	free_irq(oms->detect_irq, mmc);
	67	}
	68
9c43df57 AV	69	struct mmc_spi_platform_data mmc_spi_get_pdata(struct spi_device spi)
	70	{
	71	struct device *dev = &spi->dev;
61c7a080	72	struct device_node *np = dev->of_node;
9c43df57 AV	73	struct of_mmc_spi *oms;
	74	const u32 *voltage_ranges;
	75	int num_ranges;
	76	int i;
	77	int ret = -EINVAL;
	78
	79	if (dev->platform_data \|\| !np)
	80	return dev->platform_data;
	81
	82	oms = kzalloc(sizeof(*oms), GFP_KERNEL);
	83	if (!oms)
	84	return NULL;
	85
	86	voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
	87	num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
	88	if (!voltage_ranges \|\| !num_ranges) {
	89	dev_err(dev, "OF: voltage-ranges unspecified\n");
	90	goto err_ocr;
	91	}
	92
	93	for (i = 0; i < num_ranges; i++) {
	94	const int j = i * 2;
	95	u32 mask;
	96
b6bf30d9 JCPV	97	mask = mmc_vddrange_to_ocrmask(be32_to_cpu(voltage_ranges[j]),
b6bf30d9 JCPV	98	be32_to_cpu(voltage_ranges[j + 1]));
9c43df57 AV	99	if (!mask) {
	100	ret = -EINVAL;
	101	dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
	102	goto err_ocr;
	103	}
	104	oms->pdata.ocr_mask \|= mask;
	105	}
	106
	107	for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
	108	enum of_gpio_flags gpio_flags;
	109
	110	oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
	111	if (!gpio_is_valid(oms->gpios[i]))
	112	continue;
	113
9c43df57 AV	114	if (gpio_flags & OF_GPIO_ACTIVE_LOW)
	115	oms->alow_gpios[i] = true;
	116	}
	117
bf287a90 LP	118	if (gpio_is_valid(oms->gpios[CD_GPIO])) {
	119	oms->pdata.cd_gpio = oms->gpios[CD_GPIO];
	120	oms->pdata.flags \|= MMC_SPI_USE_CD_GPIO;
	121	if (!oms->alow_gpios[CD_GPIO])
	122	oms->pdata.caps2 \|= MMC_CAP2_CD_ACTIVE_HIGH;
	123	}
	124	if (gpio_is_valid(oms->gpios[WP_GPIO])) {
	125	oms->pdata.ro_gpio = oms->gpios[WP_GPIO];
	126	oms->pdata.flags \|= MMC_SPI_USE_RO_GPIO;
	127	if (!oms->alow_gpios[WP_GPIO])
	128	oms->pdata.caps2 \|= MMC_CAP2_RO_ACTIVE_HIGH;
	129	}
9c43df57	130
290293ed	131	oms->detect_irq = irq_of_parse_and_map(np, 0);
073350f7	132	if (oms->detect_irq != 0) {
290293ed EH	133	oms->pdata.init = of_mmc_spi_init;
	134	oms->pdata.exit = of_mmc_spi_exit;
	135	} else {
	136	oms->pdata.caps \|= MMC_CAP_NEEDS_POLL;
	137	}
9c43df57 AV	138
	139	dev->platform_data = &oms->pdata;
	140	return dev->platform_data;
	141	err_ocr:
	142	kfree(oms);
	143	return NULL;
	144	}
	145	EXPORT_SYMBOL(mmc_spi_get_pdata);
	146
	147	void mmc_spi_put_pdata(struct spi_device *spi)
	148	{
	149	struct device *dev = &spi->dev;
61c7a080	150	struct device_node *np = dev->of_node;
9c43df57	151	struct of_mmc_spi *oms = to_of_mmc_spi(dev);
9c43df57 AV	152
	153	if (!dev->platform_data \|\| !np)
	154	return;
	155
9c43df57 AV	156	kfree(oms);
	157	dev->platform_data = NULL;
	158	}
	159	EXPORT_SYMBOL(mmc_spi_put_pdata);