1/*
 2 * Atmel (Multi-port DDR-)SDRAM Controller driver
 3 *
 4 * Author: Alexandre Belloni <alexandre.belloni@free-electrons.com>
 5 *
 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>
25#include <linux/init.h>
26#include <linux/of_platform.h>
27#include <linux/platform_device.h>
28
29struct at91_ramc_caps {
30	bool has_ddrck;
31	bool has_mpddr_clk;
32};
33
34static const struct at91_ramc_caps at91rm9200_caps = { };
35
36static const struct at91_ramc_caps at91sam9g45_caps = {
37	.has_ddrck = 1,
38	.has_mpddr_clk = 0,
39};
40
41static const struct at91_ramc_caps sama5d3_caps = {
42	.has_ddrck = 1,
43	.has_mpddr_clk = 1,
44};
45
46static 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};
53
54static int atmel_ramc_probe(struct platform_device *pdev)
55{
56	const struct at91_ramc_caps *caps;
57	struct clk *clk;
58
59	caps = of_device_get_match_data(&pdev->dev);
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
80static struct platform_driver atmel_ramc_driver = {
81	.probe		= atmel_ramc_probe,
82	.driver		= {
83		.name	= "atmel-ramc",
84		.of_match_table = atmel_ramc_of_match,
85	},
86};
87
88builtin_platform_driver(atmel_ramc_driver);