ec: add support for KBC1126 in HP laptops

- let the coreboot build system insert the two blobs to the coreboot image
- EC and Super I/O initialization
- ACPI support

Tested on 2760p, 8460p, 2570p, 8470p.

Issue:

Kernel gives the following error:

  ACPI Error: No handler for Region [ECRM] (...) [EmbeddedControl]
  ACPI Error: Region EmbeddedControl (ID=3) has no handler

TODO:

- consider moving the Super I/O initialization code to ramstage, or
  reuse the existing sio/smsc/kbc1100 code (if so, how to add the
  additional kbc1126 specific functions to sio/kbc1100)
- sort out the ACPI code which is mostly from the ACPI dump of vendor
  firmware
- find out why the digitizer in hp/2760p doesn't work
- GRUB payload freezing on all HP Elitebooks may be related to EC

Change-Id: I6b16eb7e26303eda740f52d667dedb7cc04b4ef0
Signed-off-by: Iru Cai <mytbk920423@gmail.com>
Reviewed-on: https://review.coreboot.org/19072
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 140 insertions, 0 deletions

diff --git a/src/ec/hp/kbc1126/ec.c b/src/ec/hp/kbc1126/ec.c
new file mode 100644
index 0000000000..a3e6e9c69c
--- /dev/null
+++ b/src/ec/hp/kbc1126/ec.c
@@ -0,0 +1,140 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2009 coresystems GmbH
+ * Copyright (C) 2017 Iru Cai
+ *
+ * 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 <arch/io.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <delay.h>
+
+#include "ec.h"
+#include "chip.h"
+
+static u16 ec_data_port;
+static u16 ec_cmd_port;
+
+#define   KBD_IBF	(1 << 1) /* 1: input buffer full (data ready for ec) */
+#define   KBD_OBF	(1 << 0) /* 1: output buffer full (data ready for host) */
+
+static void ec_setports(u16 data, u16 cmd)
+{
+	ec_data_port = data;
+	ec_cmd_port = cmd;
+}
+
+static int send_kbd_command(u8 command)
+{
+	int timeout;
+
+	timeout = 0x7ff;
+	while ((inb(ec_cmd_port) & KBD_IBF) && --timeout) {
+		udelay(10);
+		if ((timeout & 0xff) == 0)
+			printk(BIOS_SPEW, ".");
+	}
+	if (!timeout) {
+		printk(BIOS_DEBUG, "Timeout while sending command 0x%02x to EC!\n",
+				command);
+		return -1;
+	}
+
+	outb(command, ec_cmd_port);
+	return 0;
+}
+
+static int send_kbd_data(u8 data)
+{
+	int timeout;
+
+	timeout = 0x7ff;
+	while ((inb(ec_cmd_port) & KBD_IBF) && --timeout) { /* wait for IBF = 0 */
+		udelay(10);
+		if ((timeout & 0xff) == 0)
+			printk(BIOS_SPEW, ".");
+	}
+	if (!timeout) {
+		printk(BIOS_DEBUG, "Timeout while sending data 0x%02x to EC!\n",
+				data);
+		return -1;
+	}
+
+	outb(data, ec_data_port);
+	return 0;
+}
+
+/*
+ * kbc1126_thermalinit: initialize fan control
+ * The code is found in EcThermalInit of the vendor firmware.
+ */
+static int kbc1126_thermalinit(u8 cmd, u8 value)
+{
+	printk(BIOS_DEBUG, "KBC1126: initialize fan control.");
+
+	if (send_kbd_command(cmd) < 0)
+		return -1;
+
+	if (send_kbd_data(0x27) < 0)
+		return -1;
+
+	if (send_kbd_data(0x01) < 0)
+		return -1;
+
+	/*
+	 * The following code is needed for fan control when AC is plugged in.
+	 */
+
+	if (send_kbd_command(cmd) < 0)
+		return -1;
+
+	if (send_kbd_data(0xd5) < 0)
+		return -1;
+
+	if (send_kbd_data(value) < 0)
+		return -1;
+
+	printk(BIOS_DEBUG, "KBC1126: fan control initialized.\n");
+	return 0;
+}
+
+/*
+ * kbc1126_kbdled: set CapsLock and NumLock LEDs
+ * This is used in MemoryErrorReport of the vendor firmware.
+ */
+static void kbc1126_kbdled(u8 cmd, u8 val)
+{
+	if (send_kbd_command(cmd) < 0)
+		return;
+
+	if (send_kbd_data(0xf0) < 0)
+		return;
+
+	if (send_kbd_data(val) < 0)
+		return;
+}
+
+static void kbc1126_enable(struct device *dev)
+{
+	struct ec_hp_kbc1126_config *conf = dev->chip_info;
+	ec_setports(conf->ec_data_port, conf->ec_cmd_port);
+	kbc1126_kbdled(conf->ec_ctrl_reg, 0);
+	if (kbc1126_thermalinit(conf->ec_ctrl_reg, conf->ec_fan_ctrl_value) < 0)
+		printk(BIOS_DEBUG, "KBC1126: error when initializing fan control.\n");
+}
+
+struct chip_operations ec_hp_kbc1126_ops = {
+	CHIP_NAME("SMSC KBC1126 for HP laptops")
+	.enable_dev = kbc1126_enable
+};