hadoken: initial commit.

Board bring up. GPIO / UART / timer / console / task / hook are
working now.

BRANCH=tot
BUG=none
TEST=run on evaluation board and see LED 0/1 are blinking.
Console commands are available to use.

Change-Id: If93a2c94b8abe1c2c931c03a7a12ddd2bed9d9f6
Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/209403
Reviewed-by: Vic Yang <victoryang@chromium.org>

1 files changed, 101 insertions, 0 deletions

diff --git a/chip/nrf51/gpio.c b/chip/nrf51/gpio.c
new file mode 100644
index 0000000000..db2bd1a5e6
--- /dev/null
+++ b/chip/nrf51/gpio.c
@@ -0,0 +1,101 @@
+/* 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.
+ */
+
+#include "common.h"
+#include "gpio.h"
+#include "hooks.h"
+#include "registers.h"
+#include "task.h"
+
+
+void gpio_set_flags_by_mask(uint32_t port, uint32_t mask, uint32_t flags)
+{
+	uint32_t val = 0;
+	uint32_t bit = 31 - __builtin_clz(mask);
+
+	if (flags & GPIO_OUTPUT)
+		val |= 1 << 0;
+	else if (flags & GPIO_INPUT)
+		val |= 0 << 0;
+
+	if (flags & GPIO_PULL_DOWN)
+		val |= 1 << 2;
+	else if (flags & GPIO_PULL_UP)
+		val |= 3 << 2;
+
+	if (flags & GPIO_OUTPUT) {
+		if (flags & GPIO_HIGH)
+			NRF51_GPIO0_OUTSET = 1 << bit;
+		else if (flags & GPIO_LOW)
+			NRF51_GPIO0_OUTCLR = 1 << bit;
+	}
+
+	NRF51_PIN_CNF(bit) = val;
+}
+
+
+static void gpio_init(void)
+{
+	task_enable_irq(NRF51_PERID_GPIOTE);
+}
+DECLARE_HOOK(HOOK_INIT, gpio_init, HOOK_PRIO_DEFAULT);
+
+
+test_mockable int gpio_get_level(enum gpio_signal signal)
+{
+	return !!(NRF51_GPIO0_IN & gpio_list[signal].mask);
+}
+
+void gpio_set_level(enum gpio_signal signal, int value)
+{
+	if (value)
+		NRF51_GPIO0_OUTSET = gpio_list[signal].mask;
+	else
+		NRF51_GPIO0_OUTCLR = gpio_list[signal].mask;
+}
+
+
+void gpio_pre_init(void)
+{
+	const struct gpio_info *g = gpio_list;
+	int is_warm = 0;
+	int i;
+
+	if (NRF51_POWER_RESETREAS & (1 << 2)) {
+		/* This is a warm reboot */
+		is_warm = 1;
+	}
+
+	/* Set all GPIOs to defaults */
+	for (i = 0; i < GPIO_COUNT; i++, g++) {
+		int flags = g->flags;
+
+		if (flags & GPIO_DEFAULT)
+			continue;
+
+		/*
+		 * If this is a warm reboot, don't set the output levels or
+		 * we'll shut off the AP.
+		 */
+		if (is_warm)
+			flags &= ~(GPIO_LOW | GPIO_HIGH);
+
+		/* Set up GPIO based on flags */
+		gpio_set_flags_by_mask(g->port, g->mask, flags);
+	}
+}
+
+
+/*
+ *  TODO: implement GPIO interrupt.
+ */
+int gpio_enable_interrupt(enum gpio_signal signal)
+{
+	return EC_ERROR_INVAL;
+}
+void gpio_interrupt(void)
+{
+}
+DECLARE_IRQ(NRF51_PERID_GPIOTE, gpio_interrupt, 1);