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e81b6abe AB |
1 | /* |
2 | * Atmel (Multi-port DDR-)SDRAM Controller driver | |
3 | * | |
563b41c9 PG |
4 | * Author: Alexandre Belloni <alexandre.belloni@free-electrons.com> |
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); |