ARM: tegra: add Tegra114 ARM_CPUIDLE_WFI_STATE support

Adding the generic ARM_CPUIDLE_WFI_STATE support for Tegra114.
Signed-off-by: Joseph Lo <josephl@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/mach-tegra/Makefile

@@ -30,6 +30,9 @@ obj-$(CONFIG_TEGRA_PCI)			+= pcie.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)		+= board-dt-tegra20.o
 obj-$(CONFIG_ARCH_TEGRA_3x_SOC)		+= board-dt-tegra30.o
 obj-$(CONFIG_ARCH_TEGRA_114_SOC)	+= board-dt-tegra114.o
+ifeq ($(CONFIG_CPU_IDLE),y)
+obj-$(CONFIG_ARCH_TEGRA_114_SOC)	+= cpuidle-tegra114.o
+endif
 
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)		+= board-harmony-pcie.o
 

arch/arm/mach-tegra/cpuidle-tegra114.c

+/*
+ * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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/kernel.h>
+#include <linux/module.h>
+#include <linux/cpuidle.h>
+
+#include <asm/cpuidle.h>
+
+static struct cpuidle_driver tegra_idle_driver = {
+	.name = "tegra_idle",
+	.owner = THIS_MODULE,
+	.en_core_tk_irqen = 1,
+	.state_count = 1,
+	.states = {
+		[0] = ARM_CPUIDLE_WFI_STATE_PWR(600),
+	},
+};
+
+static DEFINE_PER_CPU(struct cpuidle_device, tegra_idle_device);
+
+int __init tegra114_cpuidle_init(void)
+{
+	int ret;
+	unsigned int cpu;
+	struct cpuidle_device *dev;
+	struct cpuidle_driver *drv = &tegra_idle_driver;
+
+	ret = cpuidle_register_driver(&tegra_idle_driver);
+	if (ret) {
+		pr_err("CPUidle driver registration failed\n");
+		return ret;
+	}
+
+	for_each_possible_cpu(cpu) {
+		dev = &per_cpu(tegra_idle_device, cpu);
+		dev->cpu = cpu;
+
+		dev->state_count = drv->state_count;
+		ret = cpuidle_register_device(dev);
+		if (ret) {
+			pr_err("CPU%u: CPUidle device registration failed\n",
+				cpu);
+			return ret;
+		}
+	}
+	return 0;
+}

arch/arm/mach-tegra/cpuidle.c

@@ -38,6 +38,9 @@ static int __init tegra_cpuidle_init(void)
 	case TEGRA30:
 		ret = tegra30_cpuidle_init();
 		break;
+	case TEGRA114:
+		ret = tegra114_cpuidle_init();
+		break;
 	default:
 		ret = -ENODEV;
 		break;

arch/arm/mach-tegra/cpuidle.h

@@ -29,4 +29,10 @@ int tegra30_cpuidle_init(void);
 static inline int tegra30_cpuidle_init(void) { return -ENODEV; }
 #endif
 
+#ifdef CONFIG_ARCH_TEGRA_114_SOC
+int tegra114_cpuidle_init(void);
+#else
+static inline int tegra114_cpuidle_init(void) { return -ENODEV; }
+#endif
+
 #endif