diff options
Diffstat (limited to 'drivers/mmc/host/of_mmc_spi.c')
| -rw-r--r-- | drivers/mmc/host/of_mmc_spi.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/drivers/mmc/host/of_mmc_spi.c b/drivers/mmc/host/of_mmc_spi.c new file mode 100644 index 000000000..c9eed8436 --- /dev/null +++ b/drivers/mmc/host/of_mmc_spi.c @@ -0,0 +1,157 @@ +/* + * 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, + IRQF_ONESHOT, 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 __be32 *voltage_ranges; + int num_ranges; + int i; + + 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) { + 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); |