1 files changed, 74 insertions, 0 deletions
diff --git a/drivers/memory/atmel-sdramc.c b/drivers/memory/atmel-sdramc.c
new file mode 100644
index 000000000..ea6e9e1ea
--- /dev/null
+++ b/drivers/memory/atmel-sdramc.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Atmel (Multi-port DDR-)SDRAM Controller driver
+ *
+ * Author: Alexandre Belloni <alexandre.belloni@free-electrons.com>
+ *
+ * Copyright (C) 2014 Atmel
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/init.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, },
+	{},
+};
+
+static int atmel_ramc_probe(struct platform_device *pdev)
+{
+	const struct at91_ramc_caps *caps;
+	struct clk *clk;
+
+	caps = of_device_get_match_data(&pdev->dev);
+
+	if (caps->has_ddrck) {
+		clk = devm_clk_get_enabled(&pdev->dev, "ddrck");
+		if (IS_ERR(clk))
+			return PTR_ERR(clk);
+	}
+
+	if (caps->has_mpddr_clk) {
+		clk = devm_clk_get_enabled(&pdev->dev, "mpddr");
+		if (IS_ERR(clk)) {
+			pr_err("AT91 RAMC: couldn't get mpddr clock\n");
+			return PTR_ERR(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,
+	},
+};
+
+builtin_platform_driver(atmel_ramc_driver);