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Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[karo-tx-linux.git] / drivers / memory / atmel-sdramc.c
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",
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");