projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | { | |
| 56 | const struct of_device_id *match; | |
| 57 | const struct at91_ramc_caps *caps; | |
| 58 | struct clk *clk; | |
| 59 | ||
| 60 | match = of_match_device(atmel_ramc_of_match, &pdev->dev); | |
| 61 | caps = match->data; | |
| 62 | ||
| 63 | if (caps->has_ddrck) { | |
| 64 | clk = devm_clk_get(&pdev->dev, "ddrck"); | |
| 65 | if (IS_ERR(clk)) | |
| 66 | return PTR_ERR(clk); | |
| 67 | clk_prepare_enable(clk); | |
| 68 | } | |
| 69 | ||
| 70 | if (caps->has_mpddr_clk) { | |
| 71 | clk = devm_clk_get(&pdev->dev, "mpddr"); | |
| 72 | if (IS_ERR(clk)) { | |
| 73 | pr_err("AT91 RAMC: couldn't get mpddr clock\n"); | |
| 74 | return PTR_ERR(clk); | |
| 75 | } | |
| 76 | clk_prepare_enable(clk); | |
| 77 | } | |
| 78 | ||
| 79 | return 0; | |
| 80 | } | |
| 81 | ||
| 82 | static struct platform_driver atmel_ramc_driver = { | |
| 83 | .probe = atmel_ramc_probe, | |
| 84 | .driver = { | |
| 85 | .name = "atmel-ramc", | |
| e81b6abe AB |
86 | .of_match_table = atmel_ramc_of_match, |
| 87 | }, | |
| 88 | }; | |
| 89 | ||
| 90 | static int __init atmel_ramc_init(void) | |
| 91 | { | |
| 92 | return platform_driver_register(&atmel_ramc_driver); | |
| 93 | } | |
| 563b41c9 | 94 | device_initcall(atmel_ramc_init); |