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>

diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 8165b0a..f6b46ae 100644 (file)
--- a/arch/arm/mach-tegra/Makefile
+++ b/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
 

diff --git a/arch/arm/mach-tegra/cpuidle-tegra114.c b/arch/arm/mach-tegra/cpuidle-tegra114.c
new file mode 100644 (file)
index 0000000..0f4e8c4
--- /dev/null
+++ b/arch/arm/mach-tegra/cpuidle-tegra114.c
@@ -0,0 +1,61 @@
+/*
+ * 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;
+}

diff --git a/arch/arm/mach-tegra/cpuidle.c b/arch/arm/mach-tegra/cpuidle.c
index d065139..4b744c4 100644 (file)
--- a/arch/arm/mach-tegra/cpuidle.c
+++ b/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;

diff --git a/arch/arm/mach-tegra/cpuidle.h b/arch/arm/mach-tegra/cpuidle.h
index 496204d..d733f75 100644 (file)
--- a/arch/arm/mach-tegra/cpuidle.h
+++ b/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