mediatek/mt8183: Add GPIO support

This patch implements gpio_set_pull() and links the common MediaTek
GPIO code to support IO config for other drivers (ex. SPI) and the
requested functions in src/include/gpio.h.

BUG=b:80501386
BRANCH=none
TEST=Boots correctly on Kukui

Change-Id: Ia2b0d88e9b70c9ad148797d77dc9e79ce1bcb64a
Signed-off-by: Po Xu <jg_poxu@mediatek.com>
Reviewed-on: https://review.coreboot.org/27417
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

1 files changed, 69 insertions, 0 deletions

diff --git a/src/soc/mediatek/mt8183/gpio.c b/src/soc/mediatek/mt8183/gpio.c
new file mode 100644
index 0000000000..d555c3356b
--- /dev/null
+++ b/src/soc/mediatek/mt8183/gpio.c
@@ -0,0 +1,69 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 MediaTek 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.
+ */
+
+#include <arch/io.h>
+#include <gpio.h>
+
+enum {
+	EN_OFFSET = 0x60,
+	SEL_OFFSET = 0x80,
+};
+
+static void gpio_set_pull_pupd(gpio_t gpio, enum pull_enable enable,
+			       enum pull_select select)
+{
+	void *reg = GPIO_TO_IOCFG_BASE(gpio.base) + gpio.offset;
+	int bit = gpio.bit;
+
+	if (enable == GPIO_PULL_ENABLE) {
+		if (select == GPIO_PULL_DOWN)
+			setbits_le32(reg, 1 << (bit + 2));
+		else
+			clrbits_le32(reg, 1 << (bit + 2));
+	}
+
+	if (enable == GPIO_PULL_ENABLE)
+		clrsetbits_le32(reg, 3 << bit, 1 << bit);
+	else
+		clrbits_le32(reg, 3 << bit);
+}
+
+static void gpio_set_pull_en_sel(gpio_t gpio, enum pull_enable enable,
+				 enum pull_select select)
+{
+	void *reg = GPIO_TO_IOCFG_BASE(gpio.base) + gpio.offset;
+	int bit = gpio.bit;
+
+	if (enable == GPIO_PULL_ENABLE) {
+		if (select == GPIO_PULL_DOWN)
+			clrbits_le32(reg + SEL_OFFSET, 1 << bit);
+		else
+			setbits_le32(reg + SEL_OFFSET, 1 << bit);
+	}
+
+	if (enable == GPIO_PULL_ENABLE)
+		setbits_le32(reg + EN_OFFSET, 1 << bit);
+	else
+		clrbits_le32(reg + EN_OFFSET, 1 << bit);
+}
+
+void gpio_set_pull(gpio_t gpio, enum pull_enable enable,
+		   enum pull_select select)
+{
+	if (gpio.flag)
+		gpio_set_pull_pupd(gpio, enable, select);
+	else
+		gpio_set_pull_en_sel(gpio, enable, select);
+}