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/of.h> 20 #include <linux/of_irq.h> 21 #include <linux/spi/spi.h> 22 #include <linux/spi/mmc_spi.h> 23 #include <linux/mmc/core.h> 24 #include <linux/mmc/host.h> 25 26 /* For archs that don't support NO_IRQ (such as mips), provide a dummy value */ 27 #ifndef NO_IRQ 28 #define NO_IRQ 0 29 #endif 30 31 MODULE_LICENSE("GPL"); 32 33 struct of_mmc_spi { 34 int detect_irq; 35 struct mmc_spi_platform_data pdata; 36 }; 37 38 static struct of_mmc_spi *to_of_mmc_spi(struct device *dev) 39 { 40 return container_of(dev->platform_data, struct of_mmc_spi, pdata); 41 } 42 43 static int of_mmc_spi_init(struct device *dev, 44 irqreturn_t (*irqhandler)(int, void *), void *mmc) 45 { 46 struct of_mmc_spi *oms = to_of_mmc_spi(dev); 47 48 return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 49 IRQF_ONESHOT, dev_name(dev), mmc); 50 } 51 52 static void of_mmc_spi_exit(struct device *dev, void *mmc) 53 { 54 struct of_mmc_spi *oms = to_of_mmc_spi(dev); 55 56 free_irq(oms->detect_irq, mmc); 57 } 58 59 struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi) 60 { 61 struct device *dev = &spi->dev; 62 struct device_node *np = dev->of_node; 63 struct of_mmc_spi *oms; 64 65 if (dev->platform_data || !np) 66 return dev->platform_data; 67 68 oms = kzalloc(sizeof(*oms), GFP_KERNEL); 69 if (!oms) 70 return NULL; 71 72 if (mmc_of_parse_voltage(np, &oms->pdata.ocr_mask) <= 0) 73 goto err_ocr; 74 75 oms->detect_irq = irq_of_parse_and_map(np, 0); 76 if (oms->detect_irq != 0) { 77 oms->pdata.init = of_mmc_spi_init; 78 oms->pdata.exit = of_mmc_spi_exit; 79 } else { 80 oms->pdata.caps |= MMC_CAP_NEEDS_POLL; 81 } 82 83 dev->platform_data = &oms->pdata; 84 return dev->platform_data; 85 err_ocr: 86 kfree(oms); 87 return NULL; 88 } 89 EXPORT_SYMBOL(mmc_spi_get_pdata); 90 91 void mmc_spi_put_pdata(struct spi_device *spi) 92 { 93 struct device *dev = &spi->dev; 94 struct device_node *np = dev->of_node; 95 struct of_mmc_spi *oms = to_of_mmc_spi(dev); 96 97 if (!dev->platform_data || !np) 98 return; 99 100 kfree(oms); 101 dev->platform_data = NULL; 102 } 103 EXPORT_SYMBOL(mmc_spi_put_pdata); 104