google/cyan: convert to variant configuration

Setup cyan to be the baseboard for other Google Braswell
boards, to be added in subsequent commits:

- Keep code common to all Google Braswell boards in the baseboard,
and separate out the board-specific bits into the new cyan variant.

- Define the I2C ACPI devices such that they can be easily reused for
other variants.

- Switch the trackpad/touchscreen interrupts from edge to level,
for better performance/compatibility, as was done with all previous
Google boards.

- Add code to the baseboard to allow optional variant-specific
parameters to be used for both memory and silicon init.

- Remove superfluous includes, replace some hardcoded values with
variables, and correct typos/formatting errors.

Change-Id: Iabbbad16efa9cfa79338f4e94d0771779900d8d9
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/21126
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 61 insertions, 0 deletions

diff --git a/src/mainboard/google/cyan/acpi/touchscreen_elan.asl b/src/mainboard/google/cyan/acpi/touchscreen_elan.asl
new file mode 100644
index 0000000000..7100120585
--- /dev/null
+++ b/src/mainboard/google/cyan/acpi/touchscreen_elan.asl
@@ -0,0 +1,61 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 Google Inc.
+ * Copyright (C) 2015 Intel Corp.
+ *
+ * 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.
+ */
+
+Scope (\_SB.PCI0.I2C1)
+{
+	Device (ETSA)
+	{
+		Name (_HID, "ELAN0001")
+		Name (_DDN, "Elan Touchscreen ")
+		Name (_UID, 5)
+		Name (ISTP, 0) /* TouchScreen */
+
+		Method(_CRS, 0x0, NotSerialized)
+		{
+			Name(BUF0,ResourceTemplate ()
+			{
+				I2CSerialBus(
+					0x10,                     /* SlaveAddress */
+					ControllerInitiated,      /* SlaveMode */
+					400000,                   /* ConnectionSpeed */
+					AddressingMode7Bit,       /* AddressingMode */
+					"\\_SB.PCI0.I2C1",        /* ResourceSource */
+				)
+				Interrupt (ResourceConsumer, Level, ActiveLow)
+				{
+					BOARD_TOUCH_IRQ
+				}
+
+			} )
+			Return (BUF0)
+		}
+
+		Method (_STA)
+		{
+			If (LEqual (\S1EN, 1)) {
+				Return (0xF)
+			} Else {
+				Return (0x0)
+			}
+		}
+
+		Name (_PRW, Package() { BOARD_TOUCHSCREEN_WAKE_GPIO, 0x3 })
+
+		/* Allow device to power off in S0 */
+		Name (_S0W, 4)
+	}
+}