1 files changed, 52 insertions, 0 deletions
diff --git a/src/include/gpio.h b/src/include/gpio.h
new file mode 100644
index 0000000000..af06697050
--- /dev/null
+++ b/src/include/gpio.h
@@ -0,0 +1,52 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __SRC_INCLUDE_GPIO_H__
+#define __SRC_INCLUDE_GPIO_H__
+
+#include <soc/gpio.h>
+#include <types.h>
+
+/* <soc/gpio.h> must typedef a gpio_t that fits in 32 bits. */
+_Static_assert(sizeof(gpio_t) <= sizeof(u32), "gpio_t doesn't fit in lb_gpio");
+
+/* The following functions must be implemented by SoC/board code. */
+int gpio_get(gpio_t gpio);
+void gpio_set(gpio_t gpio, int value);
+void gpio_input_pulldown(gpio_t gpio);
+void gpio_input_pullup(gpio_t gpio);
+void gpio_input(gpio_t gpio);
+void gpio_output(gpio_t gpio, int value);
+
+/*
+ * Read the value presented by the set of GPIOs, when each pin is interpreted
+ * as a number in 0..2 range depending on the external pullup situation.
+ *
+ * Depending on the third parameter, the return value is either a set of two
+ * bit fields, each representing one GPIO value, or a number where each GPIO is
+ * included multiplied by 3^gpio_num, resulting in a true tertiary value.
+ *
+ * gpio[]: pin positions to read. little-endian (less significant value first).
+ * num_gpio: number of pins to read.
+ * tertiary: 1: pins are interpreted as a quad coded tertiary.
+ *           0: pins are interpreted as a set of two bit fields.
+ */
+int gpio_get_tristates(gpio_t gpio[], int num_gpio, int tertiary);
+
+#endif /* __SRC_INCLUDE_GPIO_H__ */