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_LICENSE("GPL"); 23 24 struct of_mmc_spi { 25 struct mmc_spi_platform_data pdata; 26 int detect_irq; 27 }; 28 29 static struct of_mmc_spi *to_of_mmc_spi(struct device *dev) 30 { 31 return container_of(dev->platform_data, struct of_mmc_spi, pdata); 32 } 33 34 static int of_mmc_spi_init(struct device *dev, 35 irqreturn_t (*irqhandler)(int, void *), void *mmc) 36 { 37 struct of_mmc_spi *oms = to_of_mmc_spi(dev); 38 39 return request_threaded_irq(oms->detect_irq, NULL, irqhandler, 40 IRQF_ONESHOT, dev_name(dev), mmc); 41 } 42 43 static void of_mmc_spi_exit(struct device *dev, void *mmc) 44 { 45 struct of_mmc_spi *oms = to_of_mmc_spi(dev); 46 47 free_irq(oms->detect_irq, mmc); 48 } 49 50 struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi) 51 { 52 struct mmc_host *mmc = dev_get_drvdata(&spi->dev); 53 struct device *dev = &spi->dev; 54 struct of_mmc_spi *oms; 55 56 if (dev->platform_data || !dev_fwnode(dev)) 57 return dev->platform_data; 58 59 oms = kzalloc(sizeof(*oms), GFP_KERNEL); 60 if (!oms) 61 return NULL; 62 63 if (mmc_of_parse_voltage(mmc, &oms->pdata.ocr_mask) < 0) 64 goto err_ocr; 65 66 oms->detect_irq = spi->irq; 67 if (oms->detect_irq > 0) { 68 oms->pdata.init = of_mmc_spi_init; 69 oms->pdata.exit = of_mmc_spi_exit; 70 } else { 71 oms->pdata.caps |= MMC_CAP_NEEDS_POLL; 72 } 73 74 dev->platform_data = &oms->pdata; 75 return dev->platform_data; 76 err_ocr: 77 kfree(oms); 78 return NULL; 79 } 80 EXPORT_SYMBOL(mmc_spi_get_pdata); 81 82 void mmc_spi_put_pdata(struct spi_device *spi) 83 { 84 struct device *dev = &spi->dev; 85 struct of_mmc_spi *oms = to_of_mmc_spi(dev); 86 87 if (!dev->platform_data || !dev_fwnode(dev)) 88 return; 89 90 kfree(oms); 91 dev->platform_data = NULL; 92 } 93 EXPORT_SYMBOL(mmc_spi_put_pdata); 94