1 files changed, 86 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/ddrc.c b/arch/arm/mach-imx/ddrc.c
new file mode 100644
index 000000000000..9c7f627d465e
--- /dev/null
+++ b/arch/arm/mach-imx/ddrc.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+
+#include "hardware.h"
+
+#define DDRC_MSTR		0x0
+#define	BM_DDRC_MSTR_DDR3	0x1
+#define	BM_DDRC_MSTR_LPDDR2	0x4
+#define	BM_DDRC_MSTR_LPDDR3	0x8
+
+static int ddr_type;
+
+static int imx_ddrc_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	void __iomem *ddrc_base, *reg;
+	u32 val;
+
+	ddrc_base = of_iomap(np, 0);
+	WARN_ON(!ddrc_base);
+
+	reg = ddrc_base + DDRC_MSTR;
+	/* Get ddr type */
+	val = readl_relaxed(reg);
+	val &= (BM_DDRC_MSTR_DDR3 | BM_DDRC_MSTR_LPDDR2
+		| BM_DDRC_MSTR_LPDDR3);
+
+	switch (val) {
+	case BM_DDRC_MSTR_DDR3:
+		pr_info("DDR type is DDR3!\n");
+		ddr_type = IMX_DDR_TYPE_DDR3;
+		break;
+	case BM_DDRC_MSTR_LPDDR2:
+		pr_info("DDR type is LPDDR2!\n");
+		ddr_type = IMX_DDR_TYPE_LPDDR2;
+		break;
+	case BM_DDRC_MSTR_LPDDR3:
+		pr_info("DDR type is LPDDR3!\n");
+		ddr_type = IMX_DDR_TYPE_LPDDR3;
+		break;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+int imx_ddrc_get_ddr_type(void)
+{
+	return ddr_type;
+}
+
+static struct of_device_id imx_ddrc_dt_ids[] = {
+	{ .compatible = "fsl,imx7-ddrc", },
+	{ /* sentinel */ }
+};
+
+static struct platform_driver imx_ddrc_driver = {
+	.driver		= {
+		.name	= "imx-ddrc",
+		.owner	= THIS_MODULE,
+		.of_match_table = imx_ddrc_dt_ids,
+	},
+	.probe		= imx_ddrc_probe,
+};
+
+static int __init imx_ddrc_init(void)
+{
+	return platform_driver_register(&imx_ddrc_driver);
+}
+postcore_initcall(imx_ddrc_init);