1 files changed, 73 insertions, 0 deletions
diff --git a/arch/riscv32/soc/pulpino/pulpino_idle.c b/arch/riscv32/soc/pulpino/pulpino_idle.c
new file mode 100644
index 000000000..d95086e96
--- /dev/null
+++ b/arch/riscv32/soc/pulpino/pulpino_idle.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <toolchain.h>
+#include <irq.h>
+#include <soc.h>
+
+#include <logging/kernel_event_logger.h>
+
+static ALWAYS_INLINE void pulpino_idle(unsigned int key)
+{
+#ifdef CONFIG_KERNEL_EVENT_LOGGER_SLEEP
+	_sys_k_event_logger_enter_sleep();
+#endif
+	/* unlock interrupts */
+	irq_unlock(key);
+
+	/* Put CPU core to sleep via SCR register */
+	PULP_SCR = 0x01;
+
+	/* Wait for interrupt */
+	SOC_WFI;
+}
+
+/**
+ *
+ * @brief Power save idle routine
+ *
+ * This function will be called by the kernel idle loop or possibly within
+ * an implementation of _sys_power_save_idle in the microkernel when the
+ * '_sys_power_save_flag' variable is non-zero.
+ *
+ * @return N/A
+ */
+void k_cpu_idle(void)
+{
+	pulpino_idle(SOC_MSTATUS_IEN);
+}
+
+/**
+ *
+ * @brief Atomically re-enable interrupts and enter low power mode
+ *
+ * INTERNAL
+ * The requirements for k_cpu_atomic_idle() are as follows:
+ * 1) The enablement of interrupts and entering a low-power mode needs to be
+ *    atomic, i.e. there should be no period of time where interrupts are
+ *    enabled before the processor enters a low-power mode.  See the comments
+ *    in k_lifo_get(), for example, of the race condition that
+ *    occurs if this requirement is not met.
+ *
+ * 2) After waking up from the low-power mode, the interrupt lockout state
+ *    must be restored as indicated in the 'imask' input parameter.
+ *
+ * @return N/A
+ */
+void k_cpu_atomic_idle(unsigned int key)
+{
+	pulpino_idle(key);
+}