Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / cpuidle / cpuidle-calxeda.c

diff --git a/kernel/drivers/cpuidle/cpuidle-calxeda.c b/kernel/drivers/cpuidle/cpuidle-calxeda.c
new file mode 100644 (file)
index 0000000..9445e6c
--- /dev/null
+++ b/kernel/drivers/cpuidle/cpuidle-calxeda.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2012 Calxeda, Inc.
+ *
+ * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright 2012 Linaro Ltd.
+ *
+ * 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/>.
+ *
+ * Maintainer: Rob Herring <rob.herring@calxeda.com>
+ */
+
+#include <linux/cpuidle.h>
+#include <linux/cpu_pm.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/platform_device.h>
+#include <asm/cpuidle.h>
+#include <asm/suspend.h>
+#include <asm/psci.h>
+
+static int calxeda_idle_finish(unsigned long val)
+{
+       const struct psci_power_state ps = {
+               .type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
+       };
+       return psci_ops.cpu_suspend(ps, __pa(cpu_resume));
+}
+
+static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
+                               struct cpuidle_driver *drv,
+                               int index)
+{
+       cpu_pm_enter();
+       cpu_suspend(0, calxeda_idle_finish);
+       cpu_pm_exit();
+
+       return index;
+}
+
+static struct cpuidle_driver calxeda_idle_driver = {
+       .name = "calxeda_idle",
+       .states = {
+               ARM_CPUIDLE_WFI_STATE,
+               {
+                       .name = "PG",
+                       .desc = "Power Gate",
+                       .exit_latency = 30,
+                       .power_usage = 50,
+                       .target_residency = 200,
+                       .enter = calxeda_pwrdown_idle,
+               },
+       },
+       .state_count = 2,
+};
+
+static int calxeda_cpuidle_probe(struct platform_device *pdev)
+{
+       return cpuidle_register(&calxeda_idle_driver, NULL);
+}
+
+static struct platform_driver calxeda_cpuidle_plat_driver = {
+        .driver = {
+                .name = "cpuidle-calxeda",
+        },
+        .probe = calxeda_cpuidle_probe,
+};
+
+module_platform_driver(calxeda_cpuidle_plat_driver);