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/slab.h> 18 #include <linux/irq.h> 19 #include <linux/gpio.h> 20 #include <linux/of.h> 21 #include <linux/of_gpio.h> 22 #include <linux/of_irq.h> 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 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 33 MODULE_LICENSE("GPL"); 34 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]; 44 int detect_irq; 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 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, 59 IRQF_ONESHOT, 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 69 struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi) 70 { 71 struct device *dev = &spi->dev; 72 struct device_node *np = dev->of_node; 73 struct of_mmc_spi *oms; 74 const __be32 *voltage_ranges; 75 int num_ranges; 76 int i; 77 78 if (dev->platform_data || !np) 79 return dev->platform_data; 80 81 oms = kzalloc(sizeof(*oms), GFP_KERNEL); 82 if (!oms) 83 return NULL; 84 85 voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges); 86 num_ranges = num_ranges / sizeof(*voltage_ranges) / 2; 87 if (!voltage_ranges || !num_ranges) { 88 dev_err(dev, "OF: voltage-ranges unspecified\n"); 89 goto err_ocr; 90 } 91 92 for (i = 0; i < num_ranges; i++) { 93 const int j = i * 2; 94 u32 mask; 95 96 mask = mmc_vddrange_to_ocrmask(be32_to_cpu(voltage_ranges[j]), 97 be32_to_cpu(voltage_ranges[j + 1])); 98 if (!mask) { 99 dev_err(dev, "OF: voltage-range #%d is invalid\n", i); 100 goto err_ocr; 101 } 102 oms->pdata.ocr_mask |= mask; 103 } 104 105 for (i = 0; i < ARRAY_SIZE(oms->gpios); i++) { 106 enum of_gpio_flags gpio_flags; 107 108 oms->gpios[i] = of_get_gpio_flags(np, i, &gpio_flags); 109 if (!gpio_is_valid(oms->gpios[i])) 110 continue; 111 112 if (gpio_flags & OF_GPIO_ACTIVE_LOW) 113 oms->alow_gpios[i] = true; 114 } 115 116 if (gpio_is_valid(oms->gpios[CD_GPIO])) { 117 oms->pdata.cd_gpio = oms->gpios[CD_GPIO]; 118 oms->pdata.flags |= MMC_SPI_USE_CD_GPIO; 119 if (!oms->alow_gpios[CD_GPIO]) 120 oms->pdata.caps2 |= MMC_CAP2_CD_ACTIVE_HIGH; 121 } 122 if (gpio_is_valid(oms->gpios[WP_GPIO])) { 123 oms->pdata.ro_gpio = oms->gpios[WP_GPIO]; 124 oms->pdata.flags |= MMC_SPI_USE_RO_GPIO; 125 if (!oms->alow_gpios[WP_GPIO]) 126 oms->pdata.caps2 |= MMC_CAP2_RO_ACTIVE_HIGH; 127 } 128 129 oms->detect_irq = irq_of_parse_and_map(np, 0); 130 if (oms->detect_irq != 0) { 131 oms->pdata.init = of_mmc_spi_init; 132 oms->pdata.exit = of_mmc_spi_exit; 133 } else { 134 oms->pdata.caps |= MMC_CAP_NEEDS_POLL; 135 } 136 137 dev->platform_data = &oms->pdata; 138 return dev->platform_data; 139 err_ocr: 140 kfree(oms); 141 return NULL; 142 } 143 EXPORT_SYMBOL(mmc_spi_get_pdata); 144 145 void mmc_spi_put_pdata(struct spi_device *spi) 146 { 147 struct device *dev = &spi->dev; 148 struct device_node *np = dev->of_node; 149 struct of_mmc_spi *oms = to_of_mmc_spi(dev); 150 151 if (!dev->platform_data || !np) 152 return; 153 154 kfree(oms); 155 dev->platform_data = NULL; 156 } 157 EXPORT_SYMBOL(mmc_spi_put_pdata); 158