linux_kernel/drivers/mtd/nand/denali_dt.c

/*
 * NAND Flash Controller Device Driver for DT
 *
 * Copyright © 2011, Picochip.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_device.h>

#include "denali.h"

struct denali_dt {
	struct denali_nand_info	denali;
	struct clk		*clk;
};

struct denali_dt_data {
	unsigned int revision;
	unsigned int caps;
};

static const struct denali_dt_data denali_socfpga_data = {
	.caps = DENALI_CAP_HW_ECC_FIXUP,
};

static const struct of_device_id denali_nand_dt_ids[] = {
	{
		.compatible = "altr,socfpga-denali-nand",
		.data = &denali_socfpga_data,
	},
	{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, denali_nand_dt_ids);

static int denali_dt_probe(struct platform_device *pdev)
{
	struct resource *denali_reg, *nand_data;
	struct denali_dt *dt;
	const struct denali_dt_data *data;
	struct denali_nand_info *denali;
	int ret;

	dt = devm_kzalloc(&pdev->dev, sizeof(*dt), GFP_KERNEL);
	if (!dt)
		return -ENOMEM;
	denali = &dt->denali;

	data = of_device_get_match_data(&pdev->dev);
	if (data) {
		denali->revision = data->revision;
		denali->caps = data->caps;
	}

	denali->platform = DT;
	denali->dev = &pdev->dev;
	denali->irq = platform_get_irq(pdev, 0);
	if (denali->irq < 0) {
		dev_err(&pdev->dev, "no irq defined\n");
		return denali->irq;
	}

	denali_reg = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						  "denali_reg");
	denali->flash_reg = devm_ioremap_resource(&pdev->dev, denali_reg);
	if (IS_ERR(denali->flash_reg))
		return PTR_ERR(denali->flash_reg);

	nand_data = platform_get_resource_byname(pdev, IORESOURCE_MEM,
						 "nand_data");
	denali->flash_mem = devm_ioremap_resource(&pdev->dev, nand_data);
	if (IS_ERR(denali->flash_mem))
		return PTR_ERR(denali->flash_mem);

	dt->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(dt->clk)) {
		dev_err(&pdev->dev, "no clk available\n");
		return PTR_ERR(dt->clk);
	}
	clk_prepare_enable(dt->clk);

	ret = denali_init(denali);
	if (ret)
		goto out_disable_clk;

	platform_set_drvdata(pdev, dt);
	return 0;

out_disable_clk:
	clk_disable_unprepare(dt->clk);

	return ret;
}

static int denali_dt_remove(struct platform_device *pdev)
{
	struct denali_dt *dt = platform_get_drvdata(pdev);

	denali_remove(&dt->denali);
	clk_disable_unprepare(dt->clk);

	return 0;
}

static struct platform_driver denali_dt_driver = {
	.probe		= denali_dt_probe,
	.remove		= denali_dt_remove,
	.driver		= {
		.name	= "denali-nand-dt",
		.of_match_table	= denali_nand_dt_ids,
	},
};

module_platform_driver(denali_dt_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jamie Iles");
MODULE_DESCRIPTION("DT driver for Denali NAND controller");