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