WSL2-Linux-Kernel/arch/mips/lantiq/xway/vmmc.c

/*
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 *
 *  Copyright (C) 2012 John Crispin <john@phrozen.org>
 */

#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/dma-mapping.h>

#include <lantiq_soc.h>

static unsigned int *cp1_base;

unsigned int *ltq_get_cp1_base(void)
{
	if (!cp1_base)
		panic("no cp1 base was set\n");

	return cp1_base;
}
EXPORT_SYMBOL(ltq_get_cp1_base);

static int vmmc_probe(struct platform_device *pdev)
{
#define CP1_SIZE       (1 << 20)
	int gpio_count;
	dma_addr_t dma;

	cp1_base =
		(void *) CPHYSADDR(dma_alloc_coherent(NULL, CP1_SIZE,
						    &dma, GFP_ATOMIC));

	gpio_count = of_gpio_count(pdev->dev.of_node);
	while (gpio_count > 0) {
		enum of_gpio_flags flags;
		int gpio = of_get_gpio_flags(pdev->dev.of_node,
					     --gpio_count, &flags);
		if (gpio_request(gpio, "vmmc-relay"))
			continue;
		dev_info(&pdev->dev, "requested GPIO %d\n", gpio);
		gpio_direction_output(gpio,
				      (flags & OF_GPIO_ACTIVE_LOW) ? (0) : (1));
	}

	dev_info(&pdev->dev, "reserved %dMB at 0x%p", CP1_SIZE >> 20, cp1_base);

	return 0;
}

static const struct of_device_id vmmc_match[] = {
	{ .compatible = "lantiq,vmmc-xway" },
	{},
};
MODULE_DEVICE_TABLE(of, vmmc_match);

static struct platform_driver vmmc_driver = {
	.probe = vmmc_probe,
	.driver = {
		.name = "lantiq,vmmc",
		.of_match_table = vmmc_match,
	},
};

module_platform_driver(vmmc_driver);