Linux 5.15-rc6
[muen/linux.git] / drivers / memory / atmel-sdramc.c
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
17 struct at91_ramc_caps {
18         bool has_ddrck;
19         bool has_mpddr_clk;
20 };
21
22 static const struct at91_ramc_caps at91rm9200_caps = { };
23
24 static const struct at91_ramc_caps at91sam9g45_caps = {
25         .has_ddrck = 1,
26         .has_mpddr_clk = 0,
27 };
28
29 static const struct at91_ramc_caps sama5d3_caps = {
30         .has_ddrck = 1,
31         .has_mpddr_clk = 1,
32 };
33
34 static 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
42 static 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(&pdev->dev, "ddrck");
51                 if (IS_ERR(clk))
52                         return PTR_ERR(clk);
53                 clk_prepare_enable(clk);
54         }
55
56         if (caps->has_mpddr_clk) {
57                 clk = devm_clk_get(&pdev->dev, "mpddr");
58                 if (IS_ERR(clk)) {
59                         pr_err("AT91 RAMC: couldn't get mpddr clock\n");
60                         return PTR_ERR(clk);
61                 }
62                 clk_prepare_enable(clk);
63         }
64
65         return 0;
66 }
67
68 static struct platform_driver atmel_ramc_driver = {
69         .probe          = atmel_ramc_probe,
70         .driver         = {
71                 .name   = "atmel-ramc",
72                 .of_match_table = atmel_ramc_of_match,
73         },
74 };
75
76 builtin_platform_driver(atmel_ramc_driver);