[mirror_ubuntu-bionic-kernel.git] / drivers / memory / atmel-sdramc.c

/*
 * Atmel (Multi-port DDR-)SDRAM Controller driver
 *
 * Author: Alexandre Belloni <alexandre.belloni@free-electrons.com>
 *
 * Copyright (C) 2014 Atmel
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation version 2 of the License.
 *
 * This program is distributed in the hope that 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include <linux/clk.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>

struct at91_ramc_caps {
	bool has_ddrck;
	bool has_mpddr_clk;
};

static const struct at91_ramc_caps at91rm9200_caps = { };

static const struct at91_ramc_caps at91sam9g45_caps = {
	.has_ddrck = 1,
	.has_mpddr_clk = 0,
};

static const struct at91_ramc_caps sama5d3_caps = {
	.has_ddrck = 1,
	.has_mpddr_clk = 1,
};

static const struct of_device_id atmel_ramc_of_match[] = {
	{ .compatible = "atmel,at91rm9200-sdramc", .data = &at91rm9200_caps, },
	{ .compatible = "atmel,at91sam9260-sdramc", .data = &at91rm9200_caps, },
	{ .compatible = "atmel,at91sam9g45-ddramc", .data = &at91sam9g45_caps, },
	{ .compatible = "atmel,sama5d3-ddramc", .data = &sama5d3_caps, },
	{},
};

static int atmel_ramc_probe(struct platform_device *pdev)
{
	const struct at91_ramc_caps *caps;
	struct clk *clk;

	caps = of_device_get_match_data(&pdev->dev);

	if (caps->has_ddrck) {
		clk = devm_clk_get(&pdev->dev, "ddrck");
		if (IS_ERR(clk))
			return PTR_ERR(clk);
		clk_prepare_enable(clk);
	}

	if (caps->has_mpddr_clk) {
		clk = devm_clk_get(&pdev->dev, "mpddr");
		if (IS_ERR(clk)) {
			pr_err("AT91 RAMC: couldn't get mpddr clock\n");
			return PTR_ERR(clk);
		}
		clk_prepare_enable(clk);
	}

	return 0;
}

static struct platform_driver atmel_ramc_driver = {
	.probe		= atmel_ramc_probe,
	.driver		= {
		.name	= "atmel-ramc",
		.of_match_table = atmel_ramc_of_match,
	},
};

builtin_platform_driver(atmel_ramc_driver);
Commit	Line	Data
e81b6abe AB	1	/*
	2	* Atmel (Multi-port DDR-)SDRAM Controller driver
	3	*
563b41c9 PG	4	* Author: Alexandre Belloni <alexandre.belloni@free-electrons.com>
563b41c9 PG	5	*
e81b6abe AB	6	* Copyright (C) 2014 Atmel
	7	*
	8	* This program is free software: you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation version 2 of the License.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	19	*
	20	*/
	21
	22	#include <linux/clk.h>
	23	#include <linux/err.h>
	24	#include <linux/kernel.h>
563b41c9	25	#include <linux/init.h>
e81b6abe AB	26	#include <linux/of_platform.h>
	27	#include <linux/platform_device.h>
	28
	29	struct at91_ramc_caps {
	30	bool has_ddrck;
	31	bool has_mpddr_clk;
	32	};
	33
	34	static const struct at91_ramc_caps at91rm9200_caps = { };
	35
	36	static const struct at91_ramc_caps at91sam9g45_caps = {
	37	.has_ddrck = 1,
	38	.has_mpddr_clk = 0,
	39	};
	40
	41	static const struct at91_ramc_caps sama5d3_caps = {
	42	.has_ddrck = 1,
	43	.has_mpddr_clk = 1,
	44	};
	45
	46	static const struct of_device_id atmel_ramc_of_match[] = {
	47	{ .compatible = "atmel,at91rm9200-sdramc", .data = &at91rm9200_caps, },
	48	{ .compatible = "atmel,at91sam9260-sdramc", .data = &at91rm9200_caps, },
	49	{ .compatible = "atmel,at91sam9g45-ddramc", .data = &at91sam9g45_caps, },
	50	{ .compatible = "atmel,sama5d3-ddramc", .data = &sama5d3_caps, },
	51	{},
	52	};
e81b6abe AB	53
	54	static int atmel_ramc_probe(struct platform_device *pdev)
	55	{
e81b6abe AB	56	const struct at91_ramc_caps *caps;
	57	struct clk *clk;
	58
7922118f	59	caps = of_device_get_match_data(&pdev->dev);
e81b6abe AB	60
	61	if (caps->has_ddrck) {
	62	clk = devm_clk_get(&pdev->dev, "ddrck");
	63	if (IS_ERR(clk))
	64	return PTR_ERR(clk);
	65	clk_prepare_enable(clk);
	66	}
	67
	68	if (caps->has_mpddr_clk) {
	69	clk = devm_clk_get(&pdev->dev, "mpddr");
	70	if (IS_ERR(clk)) {
	71	pr_err("AT91 RAMC: couldn't get mpddr clock\n");
	72	return PTR_ERR(clk);
	73	}
	74	clk_prepare_enable(clk);
	75	}
	76
	77	return 0;
	78	}
	79
	80	static struct platform_driver atmel_ramc_driver = {
	81	.probe = atmel_ramc_probe,
	82	.driver = {
	83	.name = "atmel-ramc",
e81b6abe AB	84	.of_match_table = atmel_ramc_of_match,
	85	},
	86	};
	87
af692400	88	builtin_platform_driver(atmel_ramc_driver);