| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * OpenFirmware bindings for the MMC-over-SPI driver |
| * |
| * Copyright (c) MontaVista Software, Inc. 2008. |
| * |
| * Author: Anton Vorontsov <avorontsov@ru.mvista.com> |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/device.h> |
| #include <linux/slab.h> |
| #include <linux/irq.h> |
| #include <linux/of.h> |
| #include <linux/of_irq.h> |
| #include <linux/spi/spi.h> |
| #include <linux/spi/mmc_spi.h> |
| #include <linux/mmc/core.h> |
| #include <linux/mmc/host.h> |
| |
| MODULE_LICENSE("GPL"); |
| |
| struct of_mmc_spi { |
| struct mmc_spi_platform_data pdata; |
| int detect_irq; |
| }; |
| |
| static struct of_mmc_spi *to_of_mmc_spi(struct device *dev) |
| { |
| return container_of(dev->platform_data, struct of_mmc_spi, pdata); |
| } |
| |
| static int of_mmc_spi_init(struct device *dev, |
| irqreturn_t (*irqhandler)(int, void *), void *mmc) |
| { |
| struct of_mmc_spi *oms = to_of_mmc_spi(dev); |
| |
| return request_threaded_irq(oms->detect_irq, NULL, irqhandler, |
| IRQF_ONESHOT, dev_name(dev), mmc); |
| } |
| |
| static void of_mmc_spi_exit(struct device *dev, void *mmc) |
| { |
| struct of_mmc_spi *oms = to_of_mmc_spi(dev); |
| |
| free_irq(oms->detect_irq, mmc); |
| } |
| |
| struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi) |
| { |
| struct mmc_host *mmc = dev_get_drvdata(&spi->dev); |
| struct device *dev = &spi->dev; |
| struct of_mmc_spi *oms; |
| |
| if (dev->platform_data || !dev_fwnode(dev)) |
| return dev->platform_data; |
| |
| oms = kzalloc(sizeof(*oms), GFP_KERNEL); |
| if (!oms) |
| return NULL; |
| |
| if (mmc_of_parse_voltage(mmc, &oms->pdata.ocr_mask) < 0) |
| goto err_ocr; |
| |
| oms->detect_irq = spi->irq; |
| if (oms->detect_irq > 0) { |
| oms->pdata.init = of_mmc_spi_init; |
| oms->pdata.exit = of_mmc_spi_exit; |
| } else { |
| oms->pdata.caps |= MMC_CAP_NEEDS_POLL; |
| } |
| |
| dev->platform_data = &oms->pdata; |
| return dev->platform_data; |
| err_ocr: |
| kfree(oms); |
| return NULL; |
| } |
| EXPORT_SYMBOL(mmc_spi_get_pdata); |
| |
| void mmc_spi_put_pdata(struct spi_device *spi) |
| { |
| struct device *dev = &spi->dev; |
| struct of_mmc_spi *oms = to_of_mmc_spi(dev); |
| |
| if (!dev->platform_data || !dev_fwnode(dev)) |
| return; |
| |
| kfree(oms); |
| dev->platform_data = NULL; |
| } |
| EXPORT_SYMBOL(mmc_spi_put_pdata); |