superio/ite/it8623e: initialize the PWM fan controller

Copies the common/env_ctrl support code from the it8728f driver.

Tested on an ASUS AM1I-A using Linux 4.16.7-gentoo as payload,
and booting userspace without a kexec call.

Prior to this change, an error was given during boot:

it87 it87.656: Detected broken BIOS defaults, disabling PWM interface

After this change, the message is gone, and PWM fan control works
through the /sys/class/hwmon interface.

Change-Id: Id97c4ec19562e7c78308c5afe6ff7c938922c9e7
Signed-off-by: Kevin Cody-Little <kcodyjr@gmail.com>
Reviewed-on: https://review.coreboot.org/26224
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

3 files changed, 39 insertions, 0 deletions

diff --git a/src/superio/ite/it8623e/Kconfig b/src/superio/ite/it8623e/Kconfig
index 1b4fe4a8bd..274959e2be 100644
--- a/src/superio/ite/it8623e/Kconfig
+++ b/src/superio/ite/it8623e/Kconfig
@@ -4,6 +4,7 @@
 ## Copyright (C) 2009 Ronald G. Minnich
 ## Copyright (C) 2014 Edward O'Callaghan <eocallaghan@alterapraxis.com>
 ## Copyright (C) 2017 Gergely Kiss <mail.gery@gmail.com>
+## Copyright (C) 2018 Kevin Cody-Little <kcodyjr@gmail.com>
 ##
 ## 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
@@ -18,3 +19,7 @@
 config SUPERIO_ITE_IT8623E
 	bool
 	select SUPERIO_ITE_COMMON_ROMSTAGE
+	select SUPERIO_ITE_ENV_CTRL
+	select SUPERIO_ITE_ENV_CTRL_PWM_FREQ2
+	select SUPERIO_ITE_ENV_CTRL_FAN16_CONFIG
+	select SUPERIO_ITE_ENV_CTRL_8BIT_PWM
diff --git a/src/superio/ite/it8623e/chip.h b/src/superio/ite/it8623e/chip.h
new file mode 100644
index 0000000000..c92b4512f7
--- /dev/null
+++ b/src/superio/ite/it8623e/chip.h
@@ -0,0 +1,26 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Edward O'Callaghan <eocallaghan@alterapraxis.com>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#ifndef SUPERIO_ITE_IT8623E_CHIP_H
+#define SUPERIO_ITE_IT8623E_CHIP_H
+
+#include <superio/ite/common/env_ctrl_chip.h>
+
+struct superio_ite_it8623e_config {
+	struct ite_ec_config ec;
+};
+
+#endif /* SUPERIO_ITE_IT8623E_CHIP_H */
diff --git a/src/superio/ite/it8623e/superio.c b/src/superio/ite/it8623e/superio.c
index e1ae5036a9..a9cd4e55ae 100644
--- a/src/superio/ite/it8623e/superio.c
+++ b/src/superio/ite/it8623e/superio.c
@@ -22,17 +22,25 @@
 #include <arch/io.h>
 #include <stdlib.h>
 #include <superio/conf_mode.h>
+#include <superio/ite/common/env_ctrl.h>
 
+#include "chip.h"
 #include "it8623e.h"
 
 static void it8623e_init(struct device *dev)
 {
+	const struct superio_ite_it8623e_config *conf = dev->chip_info;
+	const struct resource *res;
 
 	if (!dev->enabled)
 		return;
 
 	switch (dev->path.pnp.device) {
 	case IT8623E_EC:
+		res = find_resource(dev, PNP_IDX_IO0);
+		if (!conf || !res)
+			break;
+		ite_ec_init(res->base, &conf->ec);
 		break;
 	case IT8623E_KBCK:
 		pc_keyboard_init(NO_AUX_DEVICE);