ec/lenovo/h8: Add USB Always On

USB AO is the internal name for the dedicated charging port on
ThinkPads when in S3 or lower.

AOEN (bit 0) is internal name for enabling this feature while AOCF
(bits 2 and 3) is the configuration field. According to Peter Stuge,
AOCF can be configured in this way:

    00 => AC S3 S4 S4 USB on, battery S3 USB on, battery S4 S5 off
    11 => AC S3 S4 S4 USB on, battery S3 S4 S5 USB off
    10, 01 => equivalent to 00

This commit also adds a new configuration field in the CMOS of the
X220 and the X201 to activate this feature. It probably can be also
added to all the ThinkPads that support this functionality.

With this functionality USB devices are able to negotiate full power
from the dedicated port (usually the yellow one) even in S3.

Tested on a X201 and X220 with an Android smartphone: with this
feature enabled it shows "Charging" when connected during S3, without
it it shows "Charging slowly" (or it doesn't charge at all on the
X201).

For some reasons the "AC only" mode doesn't work, so it has been
disabled.

Change-Id: Ie1269a4357e2fbd608ad8b7b8262275914730f6e
Signed-off-by: Nicola Corna <nicola@corna.info>
Reviewed-on: https://review.coreboot.org/17252
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>

4 files changed, 43 insertions, 0 deletions

diff --git a/src/ec/lenovo/h8/Makefile.inc b/src/ec/lenovo/h8/Makefile.inc
index 4829e7b624..da9cee1d9f 100644
--- a/src/ec/lenovo/h8/Makefile.inc
+++ b/src/ec/lenovo/h8/Makefile.inc
@@ -1,5 +1,6 @@
 ifeq ($(CONFIG_EC_LENOVO_H8),y)
 
 ramstage-y += h8.c
+smm-y += smm.c
 
 endif
diff --git a/src/ec/lenovo/h8/h8.c b/src/ec/lenovo/h8/h8.c
index b7b9db75c9..cfc3938e3d 100644
--- a/src/ec/lenovo/h8/h8.c
+++ b/src/ec/lenovo/h8/h8.c
@@ -268,6 +268,8 @@ static void h8_enable(struct device *dev)
 	ec_write(0x1f, conf->eventf_enable);
 
 	ec_write(H8_FAN_CONTROL, H8_FAN_CONTROL_AUTO);
+	ec_write(H8_USB_ALWAYS_ON, ec_read(H8_USB_ALWAYS_ON) &
+			~H8_USB_ALWAYS_ON_ENABLE);
 
 	if (get_option(&val, "wlan") != CB_SUCCESS)
 		val = 1;
diff --git a/src/ec/lenovo/h8/h8.h b/src/ec/lenovo/h8/h8.h
index d3803c0700..290db918ec 100644
--- a/src/ec/lenovo/h8/h8.h
+++ b/src/ec/lenovo/h8/h8.h
@@ -26,6 +26,7 @@ void h8_enable_event(int event);
 void h8_disable_event(int event);
 int h8_ultrabay_device_present(void);
 u8 h8_build_id_and_function_spec_version(char *buf, u8 buf_len);
+void h8_usb_always_on(void);
 
 #if !IS_ENABLED (CONFIG_H8_DOCK_EARLY_INIT)
 void h8_mainboard_init_dock (void);
@@ -64,6 +65,10 @@ void h8_mainboard_init_dock (void);
 #define H8_LED_CONTROL_ON		0x80
 #define H8_LED_CONTROL_BLINK		0xc0
 
+#define H8_USB_ALWAYS_ON		0x0d
+#define H8_USB_ALWAYS_ON_ENABLE		0x01
+#define H8_USB_ALWAYS_ON_AC_ONLY	0x0c
+
 #define H8_LED_CONTROL_POWER_LED	0x00
 #define H8_LED_CONTROL_BAT0_LED	0x01
 #define H8_LED_CONTROL_BAT1_LED	0x02
diff --git a/src/ec/lenovo/h8/smm.c b/src/ec/lenovo/h8/smm.c
new file mode 100644
index 0000000000..31009a6926
--- /dev/null
+++ b/src/ec/lenovo/h8/smm.c
@@ -0,0 +1,35 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Nicola Corna <nicola@corna.info>
+ *
+ * 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 <ec/acpi/ec.h>
+#include <pc80/mc146818rtc.h>
+
+#include "h8.h"
+
+void h8_usb_always_on(void)
+{
+	u8 val;
+	u8 reg;
+
+	if (get_option(&val, "usb_always_on") != CB_SUCCESS)
+		val = 0;
+
+	if (val) {
+		reg = ec_read(H8_USB_ALWAYS_ON);
+		reg &= ~H8_USB_ALWAYS_ON_AC_ONLY;
+		reg |= H8_USB_ALWAYS_ON_ENABLE;
+		ec_write(H8_USB_ALWAYS_ON, reg);
+	}
+}