Initial file dump from open source releaseHEADmaster

1 files changed, 98 insertions, 0 deletions

diff --git a/drivers/cpuidle/cpuidle-calxeda.c b/drivers/cpuidle/cpuidle-calxeda.c
new file mode 100644
index 00000000..0e6e408c
--- /dev/null
+++ b/drivers/cpuidle/cpuidle-calxeda.c
@@ -0,0 +1,98 @@
+/*
+ * 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/init.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/time.h>
+#include <linux/delay.h>
+#include <linux/suspend.h>
+#include <asm/cpuidle.h>
+#include <asm/proc-fns.h>
+#include <asm/smp_scu.h>
+#include <asm/suspend.h>
+#include <asm/cacheflush.h>
+#include <asm/cp15.h>
+
+extern void highbank_set_cpu_jump(int cpu, void *jump_addr);
+extern void *scu_base_addr;
+
+static noinline void calxeda_idle_restore(void)
+{
+	set_cr(get_cr() | CR_C);
+	set_auxcr(get_auxcr() | 0x40);
+	scu_power_mode(scu_base_addr, SCU_PM_NORMAL);
+}
+
+static int calxeda_idle_finish(unsigned long val)
+{
+	/* Already flushed cache, but do it again as the outer cache functions
+	 * dirty the cache with spinlocks */
+	flush_cache_all();
+
+	set_auxcr(get_auxcr() & ~0x40);
+	set_cr(get_cr() & ~CR_C);
+
+	scu_power_mode(scu_base_addr, SCU_PM_DORMANT);
+
+	cpu_do_idle();
+
+	/* Restore things if we didn't enter power-gating */
+	calxeda_idle_restore();
+	return 1;
+}
+
+static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
+				struct cpuidle_driver *drv,
+				int index)
+{
+	highbank_set_cpu_jump(smp_processor_id(), cpu_resume);
+	cpu_suspend(0, calxeda_idle_finish);
+	return index;
+}
+
+static struct cpuidle_driver calxeda_idle_driver = {
+	.name = "calxeda_idle",
+	.states = {
+		ARM_CPUIDLE_WFI_STATE,
+		{
+			.name = "PG",
+			.desc = "Power Gate",
+			.flags = CPUIDLE_FLAG_TIME_VALID,
+			.exit_latency = 30,
+			.power_usage = 50,
+			.target_residency = 200,
+			.enter = calxeda_pwrdown_idle,
+		},
+	},
+	.state_count = 2,
+};
+
+static int __init calxeda_cpuidle_init(void)
+{
+	if (!of_machine_is_compatible("calxeda,highbank"))
+		return -ENODEV;
+
+	return cpuidle_register(&calxeda_idle_driver, NULL);
+}
+module_init(calxeda_cpuidle_init);