100 строки
2.2 KiB
C
100 строки
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* OpenFirmware bindings for the MMC-over-SPI driver
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*
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* Copyright (c) MontaVista Software, Inc. 2008.
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*
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* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/irq.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/mmc_spi.h>
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#include <linux/mmc/core.h>
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#include <linux/mmc/host.h>
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/* For archs that don't support NO_IRQ (such as mips), provide a dummy value */
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#ifndef NO_IRQ
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#define NO_IRQ 0
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#endif
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MODULE_LICENSE("GPL");
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struct of_mmc_spi {
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int detect_irq;
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struct mmc_spi_platform_data pdata;
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};
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static struct of_mmc_spi *to_of_mmc_spi(struct device *dev)
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{
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return container_of(dev->platform_data, struct of_mmc_spi, pdata);
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}
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static int of_mmc_spi_init(struct device *dev,
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irqreturn_t (*irqhandler)(int, void *), void *mmc)
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{
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struct of_mmc_spi *oms = to_of_mmc_spi(dev);
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return request_threaded_irq(oms->detect_irq, NULL, irqhandler,
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IRQF_ONESHOT, dev_name(dev), mmc);
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}
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static void of_mmc_spi_exit(struct device *dev, void *mmc)
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{
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struct of_mmc_spi *oms = to_of_mmc_spi(dev);
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free_irq(oms->detect_irq, mmc);
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}
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struct mmc_spi_platform_data *mmc_spi_get_pdata(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct device_node *np = dev->of_node;
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struct of_mmc_spi *oms;
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if (dev->platform_data || !np)
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return dev->platform_data;
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oms = kzalloc(sizeof(*oms), GFP_KERNEL);
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if (!oms)
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return NULL;
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if (mmc_of_parse_voltage(np, &oms->pdata.ocr_mask) <= 0)
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goto err_ocr;
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oms->detect_irq = irq_of_parse_and_map(np, 0);
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if (oms->detect_irq != 0) {
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oms->pdata.init = of_mmc_spi_init;
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oms->pdata.exit = of_mmc_spi_exit;
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} else {
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oms->pdata.caps |= MMC_CAP_NEEDS_POLL;
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}
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dev->platform_data = &oms->pdata;
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return dev->platform_data;
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err_ocr:
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kfree(oms);
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return NULL;
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}
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EXPORT_SYMBOL(mmc_spi_get_pdata);
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void mmc_spi_put_pdata(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct device_node *np = dev->of_node;
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struct of_mmc_spi *oms = to_of_mmc_spi(dev);
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if (!dev->platform_data || !np)
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return;
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kfree(oms);
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dev->platform_data = NULL;
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}
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EXPORT_SYMBOL(mmc_spi_put_pdata);
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