182 lines
4.2 KiB
C
182 lines
4.2 KiB
C
/*
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* OpenFirmware bindings for the MMC-over-SPI driver
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*
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* Copyright (c) MontaVista Software, Inc. 2008.
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*
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <linux/gpio.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/of_irq.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/mmc_spi.h>
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#include <linux/mmc/core.h>
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#include <linux/mmc/host.h>
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/* For archs that don't support NO_IRQ (such as mips), provide a dummy value */
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#ifndef NO_IRQ
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#define NO_IRQ 0
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#endif
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MODULE_LICENSE("GPL");
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enum {
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CD_GPIO = 0,
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WP_GPIO,
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NUM_GPIOS,
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};
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struct of_mmc_spi {
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int gpios[NUM_GPIOS];
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bool alow_gpios[NUM_GPIOS];
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int detect_irq;
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struct mmc_spi_platform_data pdata;
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};
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static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
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{
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return container_of(dev->platform_data, struct of_mmc_spi, pdata);
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}
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static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num)
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{
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struct of_mmc_spi *oms = to_of_mmc_spi(dev);
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bool active_low = oms->alow_gpios[gpio_num];
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bool value = gpio_get_value(oms->gpios[gpio_num]);
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return active_low ^ value;
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}
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static int of_mmc_spi_get_cd(struct device *dev)
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{
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return of_mmc_spi_read_gpio(dev, CD_GPIO);
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}
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static int of_mmc_spi_get_ro(struct device *dev)
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{
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return of_mmc_spi_read_gpio(dev, WP_GPIO);
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}
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static int of_mmc_spi_init(struct device *dev,
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irqreturn_t (*irqhandler)(int, void *), void *mmc)
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{
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struct of_mmc_spi *oms = to_of_mmc_spi(dev);
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return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 0,
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dev_name(dev), mmc);
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}
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static void of_mmc_spi_exit(struct device *dev, void *mmc)
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{
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struct of_mmc_spi *oms = to_of_mmc_spi(dev);
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free_irq(oms->detect_irq, mmc);
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}
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struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct device_node *np = dev->of_node;
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struct of_mmc_spi *oms;
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const u32 *voltage_ranges;
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int num_ranges;
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int i;
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int ret = -EINVAL;
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if (dev->platform_data || !np)
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return dev->platform_data;
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oms = kzalloc(sizeof(*oms), GFP_KERNEL);
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if (!oms)
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return NULL;
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voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
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num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
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if (!voltage_ranges || !num_ranges) {
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dev_err(dev, "OF: voltage-ranges unspecified\n");
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goto err_ocr;
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}
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for (i = 0; i < num_ranges; i++) {
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const int j = i * 2;
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u32 mask;
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mask = mmc_vddrange_to_ocrmask(be32_to_cpu(voltage_ranges[j]),
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be32_to_cpu(voltage_ranges[j + 1]));
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if (!mask) {
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ret = -EINVAL;
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dev_err(dev, "OF: voltage-range #%d is invalid\n", i);
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goto err_ocr;
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}
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oms->pdata.ocr_mask |= mask;
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}
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for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
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enum of_gpio_flags gpio_flags;
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oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags);
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if (!gpio_is_valid(oms->gpios[i]))
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continue;
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ret = gpio_request(oms->gpios[i], dev_name(dev));
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if (ret < 0) {
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oms->gpios[i] = -EINVAL;
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continue;
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}
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if (gpio_flags & OF_GPIO_ACTIVE_LOW)
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oms->alow_gpios[i] = true;
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}
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if (gpio_is_valid(oms->gpios[CD_GPIO]))
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oms->pdata.get_cd = of_mmc_spi_get_cd;
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if (gpio_is_valid(oms->gpios[WP_GPIO]))
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oms->pdata.get_ro = of_mmc_spi_get_ro;
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oms->detect_irq = irq_of_parse_and_map(np, 0);
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if (oms->detect_irq != NO_IRQ) {
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oms->pdata.init = of_mmc_spi_init;
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oms->pdata.exit = of_mmc_spi_exit;
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} else {
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oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
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}
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dev->platform_data = &oms->pdata;
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return dev->platform_data;
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err_ocr:
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kfree(oms);
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return NULL;
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}
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EXPORT_SYMBOL(mmc_spi_get_pdata);
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void mmc_spi_put_pdata(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct device_node *np = dev->of_node;
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struct of_mmc_spi *oms = to_of_mmc_spi(dev);
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int i;
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if (!dev->platform_data || !np)
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return;
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for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) {
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if (gpio_is_valid(oms->gpios[i]))
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gpio_free(oms->gpios[i]);
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}
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kfree(oms);
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dev->platform_data = NULL;
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}
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EXPORT_SYMBOL(mmc_spi_put_pdata);
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