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98 lines
2.6 KiB
98 lines
2.6 KiB
/* |
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* Atmel (Multi-port DDR-)SDRAM Controller driver |
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* |
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* Copyright (C) 2014 Atmel |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation version 2 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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*/ |
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#include <linux/clk.h> |
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#include <linux/err.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/of_platform.h> |
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#include <linux/platform_device.h> |
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struct at91_ramc_caps { |
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bool has_ddrck; |
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bool has_mpddr_clk; |
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}; |
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static const struct at91_ramc_caps at91rm9200_caps = { }; |
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static const struct at91_ramc_caps at91sam9g45_caps = { |
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.has_ddrck = 1, |
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.has_mpddr_clk = 0, |
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}; |
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static const struct at91_ramc_caps sama5d3_caps = { |
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.has_ddrck = 1, |
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.has_mpddr_clk = 1, |
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}; |
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static const struct of_device_id atmel_ramc_of_match[] = { |
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{ .compatible = "atmel,at91rm9200-sdramc", .data = &at91rm9200_caps, }, |
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{ .compatible = "atmel,at91sam9260-sdramc", .data = &at91rm9200_caps, }, |
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{ .compatible = "atmel,at91sam9g45-ddramc", .data = &at91sam9g45_caps, }, |
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{ .compatible = "atmel,sama5d3-ddramc", .data = &sama5d3_caps, }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, atmel_ramc_of_match); |
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static int atmel_ramc_probe(struct platform_device *pdev) |
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{ |
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const struct of_device_id *match; |
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const struct at91_ramc_caps *caps; |
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struct clk *clk; |
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match = of_match_device(atmel_ramc_of_match, &pdev->dev); |
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caps = match->data; |
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if (caps->has_ddrck) { |
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clk = devm_clk_get(&pdev->dev, "ddrck"); |
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if (IS_ERR(clk)) |
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return PTR_ERR(clk); |
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clk_prepare_enable(clk); |
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} |
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if (caps->has_mpddr_clk) { |
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clk = devm_clk_get(&pdev->dev, "mpddr"); |
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if (IS_ERR(clk)) { |
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pr_err("AT91 RAMC: couldn't get mpddr clock\n"); |
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return PTR_ERR(clk); |
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} |
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clk_prepare_enable(clk); |
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} |
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return 0; |
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} |
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static struct platform_driver atmel_ramc_driver = { |
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.probe = atmel_ramc_probe, |
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.driver = { |
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.name = "atmel-ramc", |
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.owner = THIS_MODULE, |
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.of_match_table = atmel_ramc_of_match, |
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}, |
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}; |
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static int __init atmel_ramc_init(void) |
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{ |
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return platform_driver_register(&atmel_ramc_driver); |
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} |
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module_init(atmel_ramc_init); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>"); |
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MODULE_DESCRIPTION("Atmel (Multi-port DDR-)SDRAM Controller");
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