LXR linux/drivers/mmc/host/of_mmc

   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
  27MODULE_LICENSE("GPL");
  28
  29struct of_mmc_spi {
  30        int detect_irq;
  31        struct mmc_spi_platform_data pdata;
  32};
  33
  34static 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
  39static 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
  48static 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
  55struct 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;
  81err_ocr:
  82        kfree(oms);
  83        return NULL;
  84}
  85EXPORT_SYMBOL(mmc_spi_get_pdata);
  86
  87void 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}
  99EXPORT_SYMBOL(mmc_spi_put_pdata);
 100