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1 | /* |
2 | * Atmel (Multi-port DDR-)SDRAM Controller driver | |
3 | * | |
4 | * Copyright (C) 2014 Atmel | |
5 | * | |
6 | * This program is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation version 2 of the License. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | * | |
18 | */ | |
19 | ||
20 | #include <linux/clk.h> | |
21 | #include <linux/err.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/of_platform.h> | |
25 | #include <linux/platform_device.h> | |
26 | ||
27 | struct at91_ramc_caps { | |
28 | bool has_ddrck; | |
29 | bool has_mpddr_clk; | |
30 | }; | |
31 | ||
32 | static const struct at91_ramc_caps at91rm9200_caps = { }; | |
33 | ||
34 | static const struct at91_ramc_caps at91sam9g45_caps = { | |
35 | .has_ddrck = 1, | |
36 | .has_mpddr_clk = 0, | |
37 | }; | |
38 | ||
39 | static const struct at91_ramc_caps sama5d3_caps = { | |
40 | .has_ddrck = 1, | |
41 | .has_mpddr_clk = 1, | |
42 | }; | |
43 | ||
44 | static const struct of_device_id atmel_ramc_of_match[] = { | |
45 | { .compatible = "atmel,at91rm9200-sdramc", .data = &at91rm9200_caps, }, | |
46 | { .compatible = "atmel,at91sam9260-sdramc", .data = &at91rm9200_caps, }, | |
47 | { .compatible = "atmel,at91sam9g45-ddramc", .data = &at91sam9g45_caps, }, | |
48 | { .compatible = "atmel,sama5d3-ddramc", .data = &sama5d3_caps, }, | |
49 | {}, | |
50 | }; | |
51 | MODULE_DEVICE_TABLE(of, atmel_ramc_of_match); | |
52 | ||
53 | static int atmel_ramc_probe(struct platform_device *pdev) | |
54 | { | |
55 | const struct of_device_id *match; | |
56 | const struct at91_ramc_caps *caps; | |
57 | struct clk *clk; | |
58 | ||
59 | match = of_match_device(atmel_ramc_of_match, &pdev->dev); | |
60 | caps = match->data; | |
61 | ||
62 | if (caps->has_ddrck) { | |
63 | clk = devm_clk_get(&pdev->dev, "ddrck"); | |
64 | if (IS_ERR(clk)) | |
65 | return PTR_ERR(clk); | |
66 | clk_prepare_enable(clk); | |
67 | } | |
68 | ||
69 | if (caps->has_mpddr_clk) { | |
70 | clk = devm_clk_get(&pdev->dev, "mpddr"); | |
71 | if (IS_ERR(clk)) { | |
72 | pr_err("AT91 RAMC: couldn't get mpddr clock\n"); | |
73 | return PTR_ERR(clk); | |
74 | } | |
75 | clk_prepare_enable(clk); | |
76 | } | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | static struct platform_driver atmel_ramc_driver = { | |
82 | .probe = atmel_ramc_probe, | |
83 | .driver = { | |
84 | .name = "atmel-ramc", | |
e81b6abe AB |
85 | .of_match_table = atmel_ramc_of_match, |
86 | }, | |
87 | }; | |
88 | ||
89 | static int __init atmel_ramc_init(void) | |
90 | { | |
91 | return platform_driver_register(&atmel_ramc_driver); | |
92 | } | |
93 | module_init(atmel_ramc_init); | |
94 | ||
95 | MODULE_LICENSE("GPL v2"); | |
96 | MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>"); | |
97 | MODULE_DESCRIPTION("Atmel (Multi-port DDR-)SDRAM Controller"); |