byra: Configure fan support

This sets up the configuration for the system fan.

BRANCH=none
BUG=b:173575131
TEST=buildall passes

Change-Id: I5e1d93fe55b2c5b0da1880df5500861cd6cc1494
Signed-off-by: Caveh Jalali <caveh@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2683921
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>

3 files changed, 63 insertions, 0 deletions

diff --git a/board/brya/board.h b/board/brya/board.h
index f483c028a3..07790e0ce3 100644
--- a/board/brya/board.h
+++ b/board/brya/board.h
@@ -26,6 +26,8 @@
 #define GPIO_LID_OPEN			GPIO_LID_OPEN_OD
 #define GPIO_WP_L			GPIO_EC_WP_ODL
 
+#define CONFIG_FANS			FAN_CH_COUNT
+
 /* System has back-lit keyboard */
 #define CONFIG_PWM_KBLIGHT
 
@@ -81,6 +83,16 @@ enum pwm_channel {
 	PWM_CH_COUNT
 };
 
+enum fan_channel {
+	FAN_CH_0 = 0,
+	FAN_CH_COUNT
+};
+
+enum mft_channel {
+	MFT_CH_0 = 0,
+	MFT_CH_COUNT
+};
+
 /*
  * remove when we enable CONFIG_POWER_BUTTON
  */
diff --git a/board/brya/build.mk b/board/brya/build.mk
index 9fd9c6baae..ce658b6e2f 100644
--- a/board/brya/build.mk
+++ b/board/brya/build.mk
@@ -14,6 +14,7 @@ BASEBOARD:=brya
 board-y=
 board-y+=battery.o
 board-y+=board.o
+board-y+=fans.o
 board-y+=i2c.o
 board-y+=pwm.o
 board-y+=usbc_config.o
diff --git a/board/brya/fans.c b/board/brya/fans.c
new file mode 100644
index 0000000000..f8506c2b1e
--- /dev/null
+++ b/board/brya/fans.c
@@ -0,0 +1,50 @@
+/* Copyright 2021 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.
+ */
+
+/* Physical fans. These are logically separate from pwm_channels. */
+
+#include "common.h"
+
+#include "fan.h"
+#include "fan_chip.h"
+
+/* MFT channels. These are logically separate from pwm_channels. */
+const struct mft_t mft_channels[] = {
+	[MFT_CH_0] = {
+		.module = NPCX_MFT_MODULE_1,
+		.clk_src = TCKC_LFCLK,
+		.pwm_id = PWM_CH_FAN,
+	},
+};
+BUILD_ASSERT(ARRAY_SIZE(mft_channels) == MFT_CH_COUNT);
+
+static const struct fan_conf fan_conf_0 = {
+	.flags = FAN_USE_RPM_MODE,
+	.ch = MFT_CH_0,	/* Use MFT id to control fan */
+	.pgood_gpio = -1,
+	.enable_gpio = GPIO_EN_PP5000_FAN,
+};
+
+/*
+ * TOOD(caveh): this is from volteer, need to update for brya
+ *
+ * Fan specs from datasheet:
+ * Max speed 5900 rpm (+/- 7%), minimum duty cycle 30%.
+ * Minimum speed not specified by RPM. Set minimum RPM to max speed (with
+ * margin) x 30%.
+ *    5900 x 1.07 x 0.30 = 1894, round up to 1900
+ */
+static const struct fan_rpm fan_rpm_0 = {
+	.rpm_min = 1900,
+	.rpm_start = 1900,
+	.rpm_max = 5900,
+};
+
+const struct fan_t fans[FAN_CH_COUNT] = {
+	[FAN_CH_0] = {
+		.conf = &fan_conf_0,
+		.rpm = &fan_rpm_0,
+	},
+};