mediatek/mt8173: Add da9212 driver

Add secondary PMIC for external buck control on Oak rev0/1/2/5

BRANCH=none
BUG=none
TEST=verified on Oak rev4/rev5

Change-Id: Ia000b0c7d61e8396856656247f9627e33b21b19b
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 241508e7d781fac8ee085ee81962043dd654c52d
Original-Change-Id: I6c75e2462363a5523bf1ebb03af7a36740293624
Original-Signed-off-by: henryc.chen <henryc.chen@mediatek.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/332342
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/14122
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 96 insertions, 0 deletions

diff --git a/src/soc/mediatek/mt8173/da9212.c b/src/soc/mediatek/mt8173/da9212.c
new file mode 100644
index 0000000000..8161667fa9
--- /dev/null
+++ b/src/soc/mediatek/mt8173/da9212.c
@@ -0,0 +1,96 @@
+/*
+ * 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.
+ */
+
+#include <console/console.h>
+#include <device/i2c.h>
+#include <soc/da9212.h>
+
+enum {
+	DA9212_SLAVE_ADDR = 0x68,
+};
+
+static void da9212_hw_init(uint8_t i2c_num, unsigned char variant_id)
+{
+	int ret = 0;
+	int buck_mode = DA9212_BUCK_MODE_AUTO;
+
+	if (variant_id == DA9212_VARIANT_ID_AB)
+		buck_mode = DA9212_BUCK_MODE_PWM;
+
+	/* page select to 0 */
+	ret |= i2c_write_field(i2c_num, DA9212_SLAVE_ADDR,
+			       DA9212_REG_PAGE_CON, DA9212_REG_PAGE0,
+			       DA9212_REG_PAGE_MASK, DA9212_REG_PAGE_SHIFT);
+
+	ret |= i2c_write_field(i2c_num, DA9212_SLAVE_ADDR,
+			       DA9212_REG_BUCKA_CONT, DA9212_BUCK_GPI_GPIO1,
+			       DA9212_BUCK_GPI_MASK, DA9212_BUCK_GPI_SHIFT);
+
+	ret |= i2c_write_field(i2c_num, DA9212_SLAVE_ADDR,
+			       DA9212_REG_BUCKB_CONT, DA9212_BUCK_GPI_OFF,
+			       DA9212_BUCK_GPI_OFF, DA9212_BUCK_GPI_SHIFT);
+
+	ret |= i2c_write_field(i2c_num, DA9212_SLAVE_ADDR,
+			       DA9212_REG_BUCKA_CONT, DA9212_VBUCK_SEL_A,
+			       DA9212_VBUCK_SEL_MASK, DA9212_VBUCK_SEL_SHIFT);
+
+	ret |= i2c_write_field(i2c_num, DA9212_SLAVE_ADDR,
+			       DA9212_REG_BUCKB_CONT, DA9212_VBUCK_SEL_A,
+			       DA9212_VBUCK_SEL_MASK, DA9212_VBUCK_SEL_SHIFT);
+
+	ret |= i2c_write_field(i2c_num, DA9212_SLAVE_ADDR,
+			       DA9212_REG_BUCKA_CONF, buck_mode,
+			       DA9212_BUCK_MODE_MASK, DA9212_BUCK_MODE_SHIFT);
+
+	ret |= i2c_write_field(i2c_num, DA9212_SLAVE_ADDR,
+			       DA9212_REG_BUCKB_CONF, buck_mode,
+			       DA9212_BUCK_MODE_MASK, DA9212_BUCK_MODE_SHIFT);
+
+	if (ret)
+		printk(BIOS_ERR, "ERROR: %s failed\n", __func__);
+
+}
+
+void da9212_probe(uint8_t i2c_num)
+{
+	int ret = 0;
+	unsigned char device_id = 0;
+	unsigned char variant_id = 0;
+
+
+	/* select to page 4, clear REVERT at first time */
+	ret |= i2c_write_field(i2c_num, DA9212_SLAVE_ADDR,
+			       DA9212_REG_PAGE_CON, DA9212_REG_PAGE4,
+			       0xF, DA9212_REG_PAGE_SHIFT);
+
+	ret |= i2c_read_field(i2c_num, DA9212_SLAVE_ADDR,
+			      DA9212_REG_DEVICE_ID, &device_id,
+			      0xFF, 0);
+
+	ret |= i2c_read_field(i2c_num, DA9212_SLAVE_ADDR,
+			      DA9212_REG_VARIANT_ID, &variant_id,
+			      0xFF, 0);
+
+	printk(BIOS_INFO, "%s: device ID = %#x, variant ID = %#x\n", __func__,
+	       device_id, variant_id);
+
+	/* Check device ID is DA9212 */
+	if (device_id != DA9212_ID || ret) {
+		printk(BIOS_ERR, "ERROR: unknown DA9212 device_id\n");
+		return;
+	}
+
+	da9212_hw_init(i2c_num, variant_id);
+}