1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Atmel (Multi-port DDR-)SDRAM Controller driver
 4 *
 5 * Author: Alexandre Belloni <alexandre.belloni@free-electrons.com>
 6 *
 7 * Copyright (C) 2014 Atmel
 8 */
 9
10#include <linux/clk.h>
11#include <linux/err.h>
12#include <linux/kernel.h>
13#include <linux/init.h>
14#include <linux/of_platform.h>
15#include <linux/platform_device.h>
16
17struct at91_ramc_caps {
18	bool has_ddrck;
19	bool has_mpddr_clk;
20};
21
22static const struct at91_ramc_caps at91rm9200_caps = { };
23
24static const struct at91_ramc_caps at91sam9g45_caps = {
25	.has_ddrck = 1,
26	.has_mpddr_clk = 0,
27};
28
29static const struct at91_ramc_caps sama5d3_caps = {
30	.has_ddrck = 1,
31	.has_mpddr_clk = 1,
32};
33
34static const struct of_device_id atmel_ramc_of_match[] = {
35	{ .compatible = "atmel,at91rm9200-sdramc", .data = &at91rm9200_caps, },
36	{ .compatible = "atmel,at91sam9260-sdramc", .data = &at91rm9200_caps, },
37	{ .compatible = "atmel,at91sam9g45-ddramc", .data = &at91sam9g45_caps, },
38	{ .compatible = "atmel,sama5d3-ddramc", .data = &sama5d3_caps, },
39	{},
40};
41
42static int atmel_ramc_probe(struct platform_device *pdev)
43{
44	const struct at91_ramc_caps *caps;
45	struct clk *clk;
46
47	caps = of_device_get_match_data(&pdev->dev);
48
49	if (caps->has_ddrck) {
50		clk = devm_clk_get_enabled(&pdev->dev, "ddrck");
51		if (IS_ERR(clk))
52			return PTR_ERR(clk);
53	}
54
55	if (caps->has_mpddr_clk) {
56		clk = devm_clk_get_enabled(&pdev->dev, "mpddr");
57		if (IS_ERR(clk)) {
58			pr_err("AT91 RAMC: couldn't get mpddr clock\n");
59			return PTR_ERR(clk);
60		}
61	}
62
63	return 0;
64}
65
66static struct platform_driver atmel_ramc_driver = {
67	.probe		= atmel_ramc_probe,
68	.driver		= {
69		.name	= "atmel-ramc",
70		.of_match_table = atmel_ramc_of_match,
71	},
72};
73
74builtin_platform_driver(atmel_ramc_driver);