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