lenovo/s230u: Add Thinkpad Twist (S230U)

Created using autoport plus some manual work and copying from G505S to
account for the non-H8 EC.

This model uses the same ENE KB9012 EC as the G505S.

Tested:
- Mainboard variant with 8GB Elpida DDR3
- SeaBIOS payload
- Booting into Linux 4.9.6 with Debian/unstable installed on the
  internal HDD/SDD slot
- Native raminit
- Both native VGA init and option rom VGA init
- Basic TPM functionality (auto-detection and RNG)
- Battery status readout
- Basic ACPI functions (power button event; power-off; reboot)
- thinkpad-acpi hotkey functions
- thinkpad-acpi LED control (red thinkpad LED)
- Suspend to RAM and resume works
- Mini displayport output works

Known issues:
- Patches needed for EC battery support
  https://review.coreboot.org/#/c/18348/
  https://review.coreboot.org/#/c/18349/
- No thermal zone since temperature sensing is not H8-compatible
  and needs to be reverse engineered.

Not tested:
- msata/wwan (probably works)

Signed-off-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de>
Change-Id: I52bc4515277e5c18afbb14a80a9ac788049f485c
Reviewed-on: https://review.coreboot.org/18351
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

1 files changed, 93 insertions, 0 deletions

diff --git a/src/mainboard/lenovo/s230u/mainboard.c b/src/mainboard/lenovo/s230u/mainboard.c
new file mode 100644
index 0000000000..9ed2a4b14f
--- /dev/null
+++ b/src/mainboard/lenovo/s230u/mainboard.c
@@ -0,0 +1,93 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 Sven Schnelle <svens@stackframe.org>
+ * Copyright (C) 2012 Advanced Micro Devices, Inc.
+ * Copyright (C) 2017 Tobias Diedrich <ranma+coreboot@tdiedrich.de>
+ *
+ * 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 <device/device.h>
+#include <console/console.h>
+#include <drivers/intel/gma/int15.h>
+#include <ec/acpi/ec.h>
+#include <southbridge/intel/bd82x6x/pch.h>
+#include <southbridge/intel/common/gpio.h>
+#include <string.h>
+#include <smbios.h>
+#include "ec.h"
+
+#include <arch/acpi.h>
+
+static void mainboard_init(device_t dev)
+{
+	RCBA32(0x38c8) = 0x00002005;
+	RCBA32(0x38c4) = 0x00802005;
+	RCBA32(0x38c0) = 0x00000007;
+}
+
+static u8 mainboard_fill_ec_version(char *buf, u8 buf_len)
+{
+	u8 i, c;
+	char str[16 + 1]; /* 16 ASCII chars + \0 */
+
+	/* Build ID */
+	for (i = 0; i < 8; i++) {
+		c = ec_mm_read(0xf0 + i);
+		if (c < 0x20 || c > 0x7f) {
+			i = snprintf(str, sizeof(str), "*INVALID");
+			break;
+		}
+		str[i] = c;
+	}
+
+	i = MIN(buf_len, i);
+	memcpy(buf, str, i);
+
+	return i;
+}
+
+static void mainboard_smbios_strings(
+	struct device *dev, struct smbios_type11 *t)
+{
+	char tpec[] = "IBM ThinkPad Embedded Controller -[                 ]-";
+	u16 fwvh, fwvl;
+
+	mainboard_fill_ec_version(tpec + 35, 17);
+	t->count = smbios_add_string(t->eos, tpec);
+
+	/* Apparently byteswapped compared to H8 */
+	fwvh = ec_mm_read(0xe8);
+	fwvl = ec_mm_read(0xe9);
+
+	printk(BIOS_INFO, "EC Firmware ID %.54s, Version %d.%d%d%c\n", tpec,
+	       fwvh >> 4, fwvh & 0x0f, fwvl >> 4, 0x41 + (fwvl & 0xf));
+}
+
+static void mainboard_enable(device_t dev)
+{
+	dev->ops->init = mainboard_init;
+	dev->ops->get_smbios_strings = mainboard_smbios_strings,
+
+	install_intel_vga_int15_handler(
+		GMA_INT15_ACTIVE_LFP_INT_LVDS,
+		GMA_INT15_PANEL_FIT_DEFAULT,
+		GMA_INT15_BOOT_DISPLAY_DEFAULT,
+		0);
+
+	if (!acpi_is_wakeup_s3())
+		lenovo_s230u_ec_init();
+}
+
+struct chip_operations mainboard_ops = {
+	.enable_dev = mainboard_enable,
+};