projects / deliverable / linux.git / blame
| 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> | |
| 17 | #include <linux/gpio.h> | |
| 18 | #include <linux/of.h> | |
| 19 | #include <linux/of_gpio.h> | |
| 20 | #include <linux/spi/spi.h> | |
| 21 | #include <linux/spi/mmc_spi.h> | |
| 22 | #include <linux/mmc/core.h> | |
| 23 | #include <linux/mmc/host.h> | |
| 24 | ||
| 02d9e58e GL |
25 | MODULE_LICENSE("GPL"); |
| 26 | ||
| 9c43df57 AV |
27 | enum { |
| 28 | CD_GPIO = 0, | |
| 29 | WP_GPIO, | |
| 30 | NUM_GPIOS, | |
| 31 | }; | |
| 32 | ||
| 33 | struct of_mmc_spi { | |
| 34 | int gpios[NUM_GPIOS]; | |
| 35 | bool alow_gpios[NUM_GPIOS]; | |
| 36 | struct mmc_spi_platform_data pdata; | |
| 37 | }; | |
| 38 | ||
| 39 | static struct of_mmc_spi *to_of_mmc_spi(struct device *dev) | |
| 40 | { | |
| 41 | return container_of(dev->platform_data, struct of_mmc_spi, pdata); | |
| 42 | } | |
| 43 | ||
| 44 | static int of_mmc_spi_read_gpio(struct device *dev, int gpio_num) | |
| 45 | { | |
| 46 | struct of_mmc_spi *oms = to_of_mmc_spi(dev); | |
| 47 | bool active_low = oms->alow_gpios[gpio_num]; | |
| 48 | bool value = gpio_get_value(oms->gpios[gpio_num]); | |
| 49 | ||
| 50 | return active_low ^ value; | |
| 51 | } | |
| 52 | ||
| 53 | static int of_mmc_spi_get_cd(struct device *dev) | |
| 54 | { | |
| 55 | return of_mmc_spi_read_gpio(dev, CD_GPIO); | |
| 56 | } | |
| 57 | ||
| 58 | static int of_mmc_spi_get_ro(struct device *dev) | |
| 59 | { | |
| 60 | return of_mmc_spi_read_gpio(dev, WP_GPIO); | |
| 61 | } | |
| 62 | ||
| 63 | struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi) | |
| 64 | { | |
| 65 | struct device *dev = &spi->dev; | |
| 66 | struct device_node *np = dev_archdata_get_node(&dev->archdata); | |
| 67 | struct of_mmc_spi *oms; | |
| 68 | const u32 *voltage_ranges; | |
| 69 | int num_ranges; | |
| 70 | int i; | |
| 71 | int ret = -EINVAL; | |
| 72 | ||
| 73 | if (dev->platform_data || !np) | |
| 74 | return dev->platform_data; | |
| 75 | ||
| 76 | oms = kzalloc(sizeof(*oms), GFP_KERNEL); | |
| 77 | if (!oms) | |
| 78 | return NULL; | |
| 79 | ||
| 80 | voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges); | |
| 81 | num_ranges = num_ranges / sizeof(*voltage_ranges) / 2; | |
| 82 | if (!voltage_ranges || !num_ranges) { | |
| 83 | dev_err(dev, "OF: voltage-ranges unspecified\n"); | |
| 84 | goto err_ocr; | |
| 85 | } | |
| 86 | ||
| 87 | for (i = 0; i < num_ranges; i++) { | |
| 88 | const int j = i * 2; | |
| 89 | u32 mask; | |
| 90 | ||
| 91 | mask = mmc_vddrange_to_ocrmask(voltage_ranges[j], | |
| 92 | voltage_ranges[j + 1]); | |
| 93 | if (!mask) { | |
| 94 | ret = -EINVAL; | |
| 95 | dev_err(dev, "OF: voltage-range #%d is invalid\n", i); | |
| 96 | goto err_ocr; | |
| 97 | } | |
| 98 | oms->pdata.ocr_mask |= mask; | |
| 99 | } | |
| 100 | ||
| 101 | for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) { | |
| 102 | enum of_gpio_flags gpio_flags; | |
| 103 | ||
| 104 | oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags); | |
| 105 | if (!gpio_is_valid(oms->gpios[i])) | |
| 106 | continue; | |
| 107 | ||
| 48f8151e | 108 | ret = gpio_request(oms->gpios[i], dev_name(dev)); |
| 9c43df57 AV |
109 | if (ret < 0) { |
| 110 | oms->gpios[i] = -EINVAL; | |
| 111 | continue; | |
| 112 | } | |
| 113 | ||
| 114 | if (gpio_flags & OF_GPIO_ACTIVE_LOW) | |
| 115 | oms->alow_gpios[i] = true; | |
| 116 | } | |
| 117 | ||
| 118 | if (gpio_is_valid(oms->gpios[CD_GPIO])) | |
| 119 | oms->pdata.get_cd = of_mmc_spi_get_cd; | |
| 120 | if (gpio_is_valid(oms->gpios[WP_GPIO])) | |
| 121 | oms->pdata.get_ro = of_mmc_spi_get_ro; | |
| 122 | ||
| 123 | /* We don't support interrupts yet, let's poll. */ | |
| 124 | oms->pdata.caps |= MMC_CAP_NEEDS_POLL; | |
| 125 | ||
| 126 | dev->platform_data = &oms->pdata; | |
| 127 | return dev->platform_data; | |
| 128 | err_ocr: | |
| 129 | kfree(oms); | |
| 130 | return NULL; | |
| 131 | } | |
| 132 | EXPORT_SYMBOL(mmc_spi_get_pdata); | |
| 133 | ||
| 134 | void mmc_spi_put_pdata(struct spi_device *spi) | |
| 135 | { | |
| 136 | struct device *dev = &spi->dev; | |
| 137 | struct device_node *np = dev_archdata_get_node(&dev->archdata); | |
| 138 | struct of_mmc_spi *oms = to_of_mmc_spi(dev); | |
| 139 | int i; | |
| 140 | ||
| 141 | if (!dev->platform_data || !np) | |
| 142 | return; | |
| 143 | ||
| 144 | for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) { | |
| 145 | if (gpio_is_valid(oms->gpios[i])) | |
| 146 | gpio_free(oms->gpios[i]); | |
| 147 | } | |
| 148 | kfree(oms); | |
| 149 | dev->platform_data = NULL; | |
| 150 | } | |
| 151 | EXPORT_SYMBOL(mmc_spi_put_pdata); |