1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * OpenFirmware bindings for the MMC-over-SPI driver 4 * 5 * Copyright (c) MontaVista Software, Inc. 2008. 6 * 7 * Author: Anton Vorontsov <avorontsov@ru.mvista.com> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/device.h> 13 #include <linux/slab.h> 14 #include <linux/irq.h> 15 #include <linux/of.h> 16 #include <linux/of_irq.h> 17 #include <linux/spi/spi.h> 18 #include <linux/spi/mmc_spi.h> 19 #include <linux/mmc/core.h> 20 #include <linux/mmc/host.h> 21 22 MODULE_DESCRIPTION("OpenFirmware bindings for the MMC-over-SPI driver"); 23 MODULE_LICENSE("GPL"); 24 25 struct of_mmc_spi { 26 struct mmc_spi_platform_data pdata; 27 int detect_irq; 28 }; 29 30 static struct of_mmc_spi *to_of_mmc_spi(struct device *dev) 31 { 32 return container_of(dev->platform_data, struct of_mmc_spi, pdata); 33 } 34 35 static int of_mmc_spi_init(struct device *dev, 36 irqreturn_t (*irqhandler)(int, void *), void *mmc) 37 { 38 struct of_mmc_spi *oms = to_of_mmc_spi(dev); 39 40 return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 41 IRQF_ONESHOT, dev_name(dev), mmc); 42 } 43 44 static void of_mmc_spi_exit(struct device *dev, void *mmc) 45 { 46 struct of_mmc_spi *oms = to_of_mmc_spi(dev); 47 48 free_irq(oms->detect_irq, mmc); 49 } 50 51 struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi) 52 { 53 struct mmc_host *mmc = dev_get_drvdata(&spi->dev); 54 struct device *dev = &spi->dev; 55 struct of_mmc_spi *oms; 56 57 if (dev->platform_data || !dev_fwnode(dev)) 58 return dev->platform_data; 59 60 oms = kzalloc(sizeof(*oms), GFP_KERNEL); 61 if (!oms) 62 return NULL; 63 64 if (mmc_of_parse_voltage(mmc, &oms->pdata.ocr_mask) < 0) 65 goto err_ocr; 66 67 oms->detect_irq = spi->irq; 68 if (oms->detect_irq > 0) { 69 oms->pdata.init = of_mmc_spi_init; 70 oms->pdata.exit = of_mmc_spi_exit; 71 } else { 72 oms->pdata.caps |= MMC_CAP_NEEDS_POLL; 73 } 74 if (device_property_read_bool(dev, "cap-sd-highspeed")) 75 oms->pdata.caps |= MMC_CAP_SD_HIGHSPEED; 76 if (device_property_read_bool(dev, "cap-mmc-highspeed")) 77 oms->pdata.caps |= MMC_CAP_MMC_HIGHSPEED; 78 79 dev->platform_data = &oms->pdata; 80 return dev->platform_data; 81 err_ocr: 82 kfree(oms); 83 return NULL; 84 } 85 EXPORT_SYMBOL(mmc_spi_get_pdata); 86 87 void mmc_spi_put_pdata(struct spi_device *spi) 88 { 89 struct device *dev = &spi->dev; 90 struct of_mmc_spi *oms = to_of_mmc_spi(dev); 91 92 if (!dev->platform_data || !dev_fwnode(dev)) 93 return; 94 95 kfree(oms); 96 dev->platform_data = NULL; 97 } 98 EXPORT_SYMBOL(mmc_spi_put_pdata); 99