1 files changed, 118 insertions, 0 deletions
diff --git a/board/keyborg/runtime.c b/board/keyborg/runtime.c
new file mode 100644
index 0000000000..89306d85fd
--- /dev/null
+++ b/board/keyborg/runtime.c
@@ -0,0 +1,118 @@
+/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+/* tiny substitute of the runtime layer */
+
+#include "common.h"
+#include "cpu.h"
+#include "debug.h"
+#include "irq_handler.h"
+#include "registers.h"
+#include "timer.h"
+#include "util.h"
+
+volatile uint32_t last_event;
+
+static uint32_t last_deadline;
+static uint8_t need_wfi;
+
+timestamp_t get_time(void)
+{
+	timestamp_t t;
+	uint32_t hi, lo;
+
+	do {
+		hi = STM32_TIM_CNT(3);
+		lo = STM32_TIM_CNT(2);
+	} while (hi != STM32_TIM_CNT(3));
+
+	t.le.lo = (hi << 16) | lo;
+	t.le.hi = 0;
+
+	return t;
+}
+
+void udelay(unsigned us)
+{
+	unsigned t0 = get_time().le.lo;
+	while ((get_time().le.lo - t0) < us)
+		;
+}
+
+void task_enable_irq(int irq)
+{
+	CPU_NVIC_EN(0) = 1 << irq;
+}
+
+void task_disable_irq(int irq)
+{
+	CPU_NVIC_DIS(0) = 1 << irq;
+}
+
+void task_clear_pending_irq(int irq)
+{
+	CPU_NVIC_UNPEND(0) = 1 << irq;
+}
+
+uint32_t task_set_event(task_id_t tskid, uint32_t event, int wait)
+{
+	last_event = event;
+
+	return 0;
+}
+
+void IRQ_HANDLER(STM32_IRQ_TIM2)(void)
+{
+	if (STM32_TIM_CNT(3) == last_deadline >> 16) {
+		STM32_TIM_DIER(2) = 0;
+		task_clear_pending_irq(STM32_IRQ_TIM2);
+		last_event = 1 << 29 /* task event wake */;
+		need_wfi = 0;
+	} else {
+		need_wfi = 1;
+	}
+}
+
+void __hw_clock_event_set(uint32_t deadline)
+{
+	last_deadline = deadline;
+	STM32_TIM_CCR1(2) = deadline & 0xffff;
+	STM32_TIM_SR(2) = ~2;
+	STM32_TIM_DIER(2) |= 2;
+}
+
+uint32_t task_wait_event(int timeout_us)
+{
+	uint32_t evt;
+
+	/* the event already happened */
+	if (last_event || !timeout_us) {
+		evt = last_event;
+		last_event = 0;
+
+		return evt;
+	}
+
+	/* set timeout on timer */
+	if (timeout_us > 0)
+		__hw_clock_event_set(get_time().le.lo + timeout_us);
+
+	do {
+		/* sleep until next interrupt */
+		asm volatile("wfi");
+
+		STM32_TIM_DIER(2) = 0; /* disable match interrupt */
+		evt = last_event;
+		last_event = 0;
+	} while (need_wfi);
+
+	return evt;
+}
+
+/* --- stubs --- */
+void __hw_timer_enable_clock(int n, int enable)
+{ /* Done in hardware init */ }
+
+void usleep(unsigned us)
+{ /* Used only as a workaround */ }