diff options
| -rw-r--r-- | drivers/memory/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/memory/Makefile | 1 | ||||
| -rw-r--r-- | drivers/memory/atmel-sdramc.c | 98 |
3 files changed, 109 insertions, 0 deletions
diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig index c59e9c96e86d..257061c3c816 100644 --- a/drivers/memory/Kconfig +++ b/drivers/memory/Kconfig @@ -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 diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile index 71160a2b7313..b8637261e1a1 100644 --- a/drivers/memory/Makefile +++ b/drivers/memory/Makefile @@ -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 diff --git a/drivers/memory/atmel-sdramc.c b/drivers/memory/atmel-sdramc.c new file mode 100644 index 000000000000..fed04e8efe75 --- /dev/null +++ b/drivers/memory/atmel-sdramc.c @@ -0,0 +1,98 @@ +/* + * 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"); |