mediatek/mt8173: Add GPIO driver

BUG=none
TEST=emerge-oak coreboot
BRANCH=none

Change-Id: I54755d81144b27cc9a674434609b2d99f1d486ec
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: d88a3ed43ad32e245e54a9599fb8667ce288217b
Original-Change-Id: I1142091650c0de2207c7635031aa7edfe487ad88
Original-Signed-off-by: Biao Huang <biao.huang@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/292672
Original-Commit-Ready: Yidi Lin <yidi.lin@mediatek.com>
Original-Tested-by: Yidi Lin <yidi.lin@mediatek.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/12603
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

4 files changed, 277 insertions, 1 deletions

diff --git a/src/soc/mediatek/mt8173/Kconfig b/src/soc/mediatek/mt8173/Kconfig
index 0f0b134..6f23eba 100644
--- a/src/soc/mediatek/mt8173/Kconfig
+++ b/src/soc/mediatek/mt8173/Kconfig
@@ -12,6 +12,7 @@ config SOC_MEDIATEK_MT8173
 	select HAVE_MONOTONIC_TIMER
 	select GENERIC_UDELAY
 	select HAS_PRECBMEM_TIMESTAMP_REGION
+	select GENERIC_GPIO_LIB
 
 if SOC_MEDIATEK_MT8173
 
diff --git a/src/soc/mediatek/mt8173/Makefile.inc b/src/soc/mediatek/mt8173/Makefile.inc
index 54b04bd..abaf3cc 100644
--- a/src/soc/mediatek/mt8173/Makefile.inc
+++ b/src/soc/mediatek/mt8173/Makefile.inc
@@ -28,7 +28,7 @@ ifeq ($(CONFIG_BOOTBLOCK_CONSOLE),y)
 bootblock-$(CONFIG_DRIVERS_UART) += uart.c
 endif
 
-bootblock-y += pmic_wrap.c
+bootblock-y += gpio.c pmic_wrap.c
 
 ################################################################################
 
@@ -37,6 +37,7 @@ romstage-y += timer.c
 
 romstage-$(CONFIG_DRIVERS_UART) += uart.c
 romstage-y += cbmem.c
+romstage-y += gpio.c
 
 ################################################################################
 
@@ -45,6 +46,7 @@ ramstage-y += cbfs.c
 ramstage-y += soc.c
 ramstage-y += timer.c
 ramstage-$(CONFIG_DRIVERS_UART) += uart.c
+ramstage-y += gpio.c
 
 ################################################################################
 
diff --git a/src/soc/mediatek/mt8173/gpio.c b/src/soc/mediatek/mt8173/gpio.c
new file mode 100644
index 0000000..1f0e571
--- /dev/null
+++ b/src/soc/mediatek/mt8173/gpio.c
@@ -0,0 +1,181 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 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.
+ *
+ * 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
+ */
+#include <arch/io.h>
+#include <assert.h>
+#include <console/console.h>
+#include <gpio.h>
+#include <types.h>
+#include <soc/addressmap.h>
+#include <soc/gpio.h>
+
+enum {
+	MAX_8173_GPIO = 134,
+	MAX_GPIO_REG_BITS = 16,
+	MAX_GPIO_MODE_PER_REG = 5,
+	GPIO_MODE_BITS = 3,
+};
+
+enum {
+	GPIO_DIRECTION_IN = 0,
+	GPIO_DIRECTION_OUT = 1,
+};
+
+enum {
+	GPIO_MODE = 0,
+};
+
+static void pos_bit_calc(u32 pin, u32 *pos, u32 *bit)
+{
+	*pos = pin / MAX_GPIO_REG_BITS;
+	*bit = pin % MAX_GPIO_REG_BITS;
+}
+
+static void pos_bit_calc_for_mode(u32 pin, u32 *pos, u32 *bit)
+{
+	*pos = pin / MAX_GPIO_MODE_PER_REG;
+	*bit = (pin % MAX_GPIO_MODE_PER_REG) * GPIO_MODE_BITS;
+}
+
+static s32 gpio_set_dir(u32 pin, u32 dir)
+{
+	u32 pos;
+	u32 bit;
+	u16 *reg;
+
+	assert(pin <= MAX_8173_GPIO);
+
+	pos_bit_calc(pin, &pos, &bit);
+
+	if (dir == GPIO_DIRECTION_IN)
+		reg = &mt8173_gpio->dir[pos].rst;
+	else
+		reg = &mt8173_gpio->dir[pos].set;
+
+	write16(reg, 1L << bit);
+
+	return 0;
+}
+
+void gpio_set_pull(gpio_t pin, enum pull_enable enable,
+		   enum pull_select select)
+{
+	u32 pos;
+	u32 bit;
+	u16 *en_reg, *sel_reg;
+
+	assert(pin <= MAX_8173_GPIO);
+
+	pos_bit_calc(pin, &pos, &bit);
+
+	if (enable == GPIO_PULL_DISABLE) {
+		en_reg = &mt8173_gpio->pullen[pos].rst;
+	} else {
+	/* These pins' pulls can't be set through GPIO controller. */
+		assert(pin < 22 || pin > 27);
+		assert(pin < 47 || pin > 56);
+		assert(pin < 57 || pin > 68);
+		assert(pin < 73 || pin > 78);
+		assert(pin < 100 || pin > 105);
+		assert(pin < 119 || pin > 124);
+
+		en_reg = &mt8173_gpio->pullen[pos].set;
+		sel_reg = (select == GPIO_PULL_DOWN) ?
+			  (&mt8173_gpio->pullsel[pos].rst) :
+			  (&mt8173_gpio->pullsel[pos].set);
+		write16(sel_reg, 1L << bit);
+	}
+	write16(en_reg, 1L << bit);
+}
+
+int gpio_get(gpio_t pin)
+{
+	u32 pos;
+	u32 bit;
+	u16 *reg;
+	s32 data;
+
+	assert(pin <= MAX_8173_GPIO);
+
+	pos_bit_calc(pin, &pos, &bit);
+
+	reg = &mt8173_gpio->din[pos].val;
+	data = read32(reg);
+
+	return (data & (1L << bit)) ? 1 : 0;
+}
+
+void gpio_set(gpio_t pin, int output)
+{
+	u32 pos;
+	u32 bit;
+	u16 *reg;
+
+	assert(pin <= MAX_8173_GPIO);
+
+	pos_bit_calc(pin, &pos, &bit);
+
+	if (output == 0)
+		reg = &mt8173_gpio->dout[pos].rst;
+	else
+		reg = &mt8173_gpio->dout[pos].set;
+	write16(reg, 1L << bit);
+}
+
+void gpio_set_mode(gpio_t pin, int mode)
+{
+	u32 pos;
+	u32 bit;
+	u32 mask = (1L << GPIO_MODE_BITS) - 1;
+
+	assert(pin <= MAX_8173_GPIO);
+
+	pos_bit_calc_for_mode(pin, &pos, &bit);
+
+	clrsetbits_le32(&mt8173_gpio->mode[pos].val,
+			mask << bit, mode << bit);
+}
+
+void gpio_input_pulldown(gpio_t gpio)
+{
+	gpio_set_pull(gpio, GPIO_PULL_ENABLE, GPIO_PULL_DOWN);
+	gpio_set_dir(gpio, GPIO_DIRECTION_IN);
+	gpio_set_mode(gpio, GPIO_MODE);
+}
+
+void gpio_input_pullup(gpio_t gpio)
+{
+	gpio_set_pull(gpio, GPIO_PULL_ENABLE, GPIO_PULL_UP);
+	gpio_set_dir(gpio, GPIO_DIRECTION_IN);
+	gpio_set_mode(gpio, GPIO_MODE);
+}
+
+void gpio_input(gpio_t gpio)
+{
+	gpio_set_pull(gpio, GPIO_PULL_DISABLE, GPIO_PULL_DOWN);
+	gpio_set_dir(gpio, GPIO_DIRECTION_IN);
+	gpio_set_mode(gpio, GPIO_MODE);
+}
+
+void gpio_output(gpio_t gpio, int value)
+{
+	gpio_set_pull(gpio, GPIO_PULL_DISABLE, GPIO_PULL_DOWN);
+	gpio_set(gpio, value);
+	gpio_set_dir(gpio, GPIO_DIRECTION_OUT);
+	gpio_set_mode(gpio, GPIO_MODE);
+}
diff --git a/src/soc/mediatek/mt8173/include/soc/gpio.h b/src/soc/mediatek/mt8173/include/soc/gpio.h
new file mode 100644
index 0000000..d0a3dd2
--- /dev/null
+++ b/src/soc/mediatek/mt8173/include/soc/gpio.h
@@ -0,0 +1,92 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 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.
+ *
+ * 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 SOC_MEDIATEK_MT8173_GPIO_H
+#define SOC_MEDIATEK_MT8173_GPIO_H
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <soc/addressmap.h>
+
+enum pull_enable {
+	GPIO_PULL_DISABLE = 0,
+	GPIO_PULL_ENABLE = 1,
+};
+
+enum pull_select {
+	GPIO_PULL_DOWN = 0,
+	GPIO_PULL_UP = 1,
+};
+
+enum external_power {
+	GPIO_EINT_3P3V = 0,
+	GPIO_EINT_1P8V = 1,
+};
+
+typedef u32 gpio_t;
+
+struct val_regs {
+	uint16_t val;
+	uint16_t align1;
+	uint16_t set;
+	uint16_t align2;
+	uint16_t rst;
+	uint16_t align3[3];
+};
+
+struct gpio_regs {
+	struct val_regs dir[9];
+	uint8_t rsv00[112];
+	struct val_regs pullen[9];
+	uint8_t rsv01[112];
+	struct val_regs pullsel[9];
+	uint8_t rsv02[112];
+	uint8_t rsv03[256];
+	struct val_regs dout[9];
+	uint8_t rsv04[112];
+	struct val_regs din[9];
+	uint8_t rsv05[112];
+	struct val_regs mode[27];
+	uint8_t rsv06[336];
+	struct val_regs ies[3];
+	struct val_regs smt[3];
+	uint8_t rsv07[160];
+	struct val_regs tdsel[8];
+	struct val_regs rdsel[6];
+	uint8_t rsv08[32];
+	struct val_regs drv_mode[10];
+	uint8_t rsv09[96];
+	struct val_regs msdc_rsv0[11];
+	struct val_regs msdc2_ctrl5;
+	struct val_regs msdc_rsv1[12];
+	uint8_t rsv10[64];
+	struct val_regs exmd_ctrl[1];
+	uint8_t rsv11[48];
+	struct val_regs kpad_ctrl[2];
+	struct val_regs hsic_ctrl[4];
+};
+
+check_member(gpio_regs, msdc2_ctrl5, 0xcb0);
+check_member(gpio_regs, hsic_ctrl[3], 0xe50);
+
+static struct gpio_regs *const mt8173_gpio = (void *)(GPIO_BASE);
+
+void gpio_set_pull(gpio_t gpio, enum pull_enable enable,
+		   enum pull_select select);
+void gpio_set_mode(gpio_t gpio, int mode);
+#endif /* SOC_MEDIATEK_MT8173_GPIO_H */