ec/kontron/it8516e: Add it8516e EC driver

This driver communicates with the IT8516e on the Kontron KTQM77.
Since we don't know if the firmware and protocol are standard for
the chip or customized to the board, call it kontron/it8516e.

Change-Id: I7382172c6d865d60106c929124444821a07a5184
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: http://review.coreboot.org/3390
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

1 files changed, 175 insertions, 0 deletions

diff --git a/src/ec/kontron/it8516e/ec.c b/src/ec/kontron/it8516e/ec.c
new file mode 100644
index 0000000000..f4df9c777c
--- /dev/null
+++ b/src/ec/kontron/it8516e/ec.c
@@ -0,0 +1,175 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 secunet Security Networks AG
+ *
+ * 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 <stdlib.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/pnp.h>
+#include <ec/acpi/ec.h>
+#include <pc80/mc146818rtc.h>
+
+#include "ec.h"
+#include "chip.h"
+
+typedef struct ec_kontron_it8516e_config config_t;
+
+enum { /* EC commands */
+	IT8516E_CMD_GET_FAN_MODE	= 0x10,
+	IT8516E_CMD_SET_FAN_MODE	= 0x11,
+	IT8516E_CMD_GET_FAN_PWM		= 0x12,
+	IT8516E_CMD_SET_FAN_PWM		= 0x13,
+	IT8516E_CMD_GET_FAN_SPEED	= 0x14,
+	IT8516E_CMD_SET_FAN_SPEED	= 0x15,
+	IT8516E_CMD_GET_FAN_TEMP	= 0x16,
+	IT8516E_CMD_SET_FAN_TEMP	= 0x17,
+};
+
+static void it8516e_set_fan_mode(const u8 idx, const u8 mode)
+{
+	if (send_ec_command(IT8516E_CMD_SET_FAN_MODE))
+		return;
+	if (send_ec_data(idx))
+		return;
+	send_ec_data(mode);
+}
+
+static void it8516e_set_fan_pwm(const u8 idx, const u8 pwm)
+{
+	if (send_ec_command(IT8516E_CMD_SET_FAN_PWM))
+		return;
+	if (send_ec_data(idx))
+		return;
+	send_ec_data(pwm);
+}
+
+static void it8516e_set_fan_speed(const u8 idx, const u16 speed)
+{
+	if (send_ec_command(IT8516E_CMD_SET_FAN_SPEED))
+		return;
+	if (send_ec_data(idx))
+		return;
+	if (send_ec_data(speed & 0xff))
+		return;
+	send_ec_data(speed >> 8);
+}
+
+static void it8516e_set_fan_temperature(const u8 idx, const u8 temp)
+{
+	if (send_ec_command(IT8516E_CMD_SET_FAN_TEMP))
+		return;
+	if (send_ec_data(idx))
+		return;
+	if (send_ec_data((temp << 6) & 0xff))
+		return;
+	send_ec_data(((temp << 6) >> 8) & 0xff);
+}
+
+static void it8516e_set_fan_from_options(const config_t *const config,
+					 const u8 fan_idx)
+{
+	static char fanX_mode[]		= "fanX_mode";
+	static char fanX_target[]	= "fanX_target";
+
+	u8 fan_mode = config->default_fan_mode[fan_idx];
+	u16 fan_target = config->default_fan_target[fan_idx];
+
+	fanX_mode[3] = '1' + fan_idx;
+	get_option(&fan_mode, fanX_mode);
+	if (!fan_mode)
+		fan_mode = IT8516E_MODE_AUTO;
+	it8516e_set_fan_mode(fan_idx, fan_mode);
+
+	fanX_target[3] = '1' + fan_idx;
+	get_option(&fan_target, fanX_target);
+	switch (fan_mode) {
+	case IT8516E_MODE_AUTO:
+		printk(BIOS_DEBUG,
+		       "Setting it8516e fan%d "
+		       "control to auto.\n",
+		       fan_idx + 1);
+		break;
+	case IT8516E_MODE_PWM:
+		printk(BIOS_DEBUG,
+		       "Setting it8516e fan%d "
+		       "control to %d%% PWM.\n",
+		       fan_idx + 1, fan_target);
+		it8516e_set_fan_pwm(fan_idx, fan_target);
+		break;
+	case IT8516E_MODE_SPEED:
+		printk(BIOS_DEBUG,
+		       "Setting it8516e fan%d "
+		       "control to %d RPMs.\n",
+		       fan_idx + 1, fan_target);
+		it8516e_set_fan_speed(fan_idx, fan_target);
+		break;
+	case IT8516E_MODE_THERMAL:
+		printk(BIOS_DEBUG,
+		       "Setting it8516e fan%d "
+		       "control to %d°C.\n",
+		       fan_idx + 1, fan_target);
+		it8516e_set_fan_temperature(
+			fan_idx, fan_target);
+		break;
+	}
+}
+
+static void it8516e_pm2_init(const device_t dev)
+{
+	const config_t *const config = dev->chip_info;
+
+	/* TODO: Set frequency / divider? */
+
+	ec_set_ports(find_resource(dev, PNP_IDX_IO1)->base,
+		     find_resource(dev, PNP_IDX_IO0)->base);
+
+	it8516e_set_fan_from_options(config, 0);
+	it8516e_set_fan_from_options(config, 1);
+}
+
+static struct device_operations it8516e_pm2_ops = {
+	.read_resources		= pnp_read_resources,
+	.set_resources		= pnp_set_resources,
+	.enable_resources	= pnp_enable_resources,
+	.enable			= pnp_enable,
+	.init			= it8516e_pm2_init
+};
+
+static struct pnp_info it8516e_dev_infos[] = {
+	{ NULL,             IT8516E_LDN_UART1, PNP_IO0 | PNP_IRQ0, { 0x07f8, }, },
+	{ NULL,             IT8516E_LDN_UART2, PNP_IO0 | PNP_IRQ0, { 0x07f8, }, },
+	{ NULL,             IT8516E_LDN_SWUC,  PNP_IO0 | PNP_IRQ0, { 0xff7e0, }, },
+	{ NULL,             IT8516E_LDN_MOUSE, PNP_IRQ0, },
+	{ NULL,             IT8516E_LDN_KBD,   PNP_IO0 | PNP_IO1 | PNP_IRQ0, { 0x07ff, }, { 0x07ff, }, },
+	{ NULL,             IT8516E_LDN_SMFI,  PNP_IO0 | PNP_IRQ0, { 0xfff0, }, },
+	{ NULL,             IT8516E_LDN_BRAM,  PNP_IO0 | PNP_IO1, { 0xfffe, }, { 0xfffe, }, },
+	{ NULL,             IT8516E_LDN_PM1,   PNP_IO0 | PNP_IO1 | PNP_IRQ0, { 0x07ff, }, { 0x07ff, }, },
+	{ &it8516e_pm2_ops, IT8516E_LDN_PM2,   PNP_IO0 | PNP_IO1 | PNP_IRQ0, { 0x07ff, }, { 0x07ff, }, },
+	{ NULL,             IT8516E_LDN_PM3,   PNP_IO0 | PNP_IO1 | PNP_IRQ0, { 0x07ff, }, { 0x07ff, }, },
+};
+
+static void it8516e_enable(const device_t dev)
+{
+	pnp_enable_devices(dev, &pnp_ops,
+			   ARRAY_SIZE(it8516e_dev_infos), it8516e_dev_infos);
+}
+
+const struct chip_operations ec_kontron_it8516e_ops = {
+	CHIP_NAME("Kontron (Fintec/ITE) IT8516E EC")
+	.enable_dev = it8516e_enable
+};