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path: root/drivers/cpuidle/cpuidle-calxeda.c
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Diffstat (limited to 'drivers/cpuidle/cpuidle-calxeda.c')
-rw-r--r--drivers/cpuidle/cpuidle-calxeda.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle-calxeda.c b/drivers/cpuidle/cpuidle-calxeda.c
new file mode 100644
index 000000000..9445e6cc0
--- /dev/null
+++ b/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);