182 lines
4.2 KiB
C
182 lines
4.2 KiB
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);
|