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Commit e81b6abe authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Maxime Ripard
Browse files

memory: add a driver for atmel ram controllers 



Atmel SoCs have one or multiple RAM controllers that need one or multiple clocks
to run.
This driver handle those clocks.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
parent 017b5522

drivers/memory/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -7,6 +7,16 @@ menuconfig MEMORY 


if MEMORY



config ATMEL_SDRAMC

	bool "Atmel (Multi-port DDR-)SDRAM Controller"

	default y

	depends on ARCH_AT91 && OF

	help

	  This driver is for Atmel SDRAM Controller or Atmel Multi-port

	  DDR-SDRAM Controller available on Atmel AT91SAM9 and SAMA5 SoCs.

	  Starting with the at91sam9g45, this controller supports SDR, DDR and

	  LP-DDR memories.



config TI_AEMIF

	tristate "Texas Instruments AEMIF driver"

	depends on (ARCH_DAVINCI || ARCH_KEYSTONE) && OF

drivers/memory/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -5,6 +5,7 @@ 
ifeq ($(CONFIG_DDR),y)

obj-$(CONFIG_OF)		+= of_memory.o

endif

obj-$(CONFIG_ATMEL_SDRAMC)	+= atmel-sdramc.o

obj-$(CONFIG_TI_AEMIF)		+= ti-aemif.o

obj-$(CONFIG_TI_EMIF)		+= emif.o

obj-$(CONFIG_FSL_IFC)		+= fsl_ifc.o

drivers/memory/atmel-sdramc.c

0 → 100644
+98 −0
Original line number Diff line number Diff line 
/*

 * 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",

		.owner	= THIS_MODULE,

		.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");