1 files changed, 83 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-zynq/pm.c b/kernel/arch/arm/mach-zynq/pm.c
new file mode 100644
index 000000000..fa44fc1b6
--- /dev/null
+++ b/kernel/arch/arm/mach-zynq/pm.c
@@ -0,0 +1,83 @@
+/*
+ * Zynq power management
+ *
+ *  Copyright (C) 2012 - 2014 Xilinx
+ *
+ *  Sören Brinkmann <soren.brinkmann@xilinx.com>
+ *
+ * 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, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/io.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include "common.h"
+
+/* register offsets */
+#define DDRC_CTRL_REG1_OFFS		0x60
+#define DDRC_DRAM_PARAM_REG3_OFFS	0x20
+
+/* bitfields */
+#define DDRC_CLOCKSTOP_MASK	BIT(23)
+#define DDRC_SELFREFRESH_MASK	BIT(12)
+
+static void __iomem *ddrc_base;
+
+/**
+ * zynq_pm_ioremap() - Create IO mappings
+ * @comp:	DT compatible string
+ * Return: Pointer to the mapped memory or NULL.
+ *
+ * Remap the memory region for a compatible DT node.
+ */
+static void __iomem *zynq_pm_ioremap(const char *comp)
+{
+	struct device_node *np;
+	void __iomem *base = NULL;
+
+	np = of_find_compatible_node(NULL, NULL, comp);
+	if (np) {
+		base = of_iomap(np, 0);
+		of_node_put(np);
+	} else {
+		pr_warn("%s: no compatible node found for '%s'\n", __func__,
+				comp);
+	}
+
+	return base;
+}
+
+/**
+ * zynq_pm_late_init() - Power management init
+ *
+ * Initialization of power management related features and infrastructure.
+ */
+void __init zynq_pm_late_init(void)
+{
+	u32 reg;
+
+	ddrc_base = zynq_pm_ioremap("xlnx,zynq-ddrc-a05");
+	if (!ddrc_base) {
+		pr_warn("%s: Unable to map DDRC IO memory.\n", __func__);
+	} else {
+		/*
+		 * Enable DDRC clock stop feature. The HW takes care of
+		 * entering/exiting the correct mode depending
+		 * on activity state.
+		 */
+		reg = readl(ddrc_base + DDRC_DRAM_PARAM_REG3_OFFS);
+		reg |= DDRC_CLOCKSTOP_MASK;
+		writel(reg, ddrc_base + DDRC_DRAM_PARAM_REG3_OFFS);
+	}
+}