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In order to support probing I2C devices when the controller is in ACPI mode the mainboard needs to decalre them in the proper scope with the address/interrupt information. The touchpad devices are ATML0000/ELAN0000 and the touchscreen is ATML0001 so they can be distinguished in userland scripts based on ID. There is also a special "ISTP" node that indicates whether the devices is a touchpad (=1) or touchscreen (=0) in case this is useful to drivers. These names may not be final but they are a starting point and can be easily changed. Atmel devices also have a bootloader mode which needs to be declared as a separate device. Unfortunately it does not work as expected to have multiple I2cSerialBus() resources declared in a single device and have it select properly, even with the use of StartDependentFn(), so bootloader devices are declared separately. The original devices are left in \_SB scope and are only enabled if the I2C controllers are in PCI mode. The new devices are only enabled if the I2C controllers are in ACPI mode. BUG=chrome-os-partner:24380 BRANCH=baytrail TEST=manual 1) Ensure there is no change in functionality by default and that the devices are still probed by chromeos_laptop in the kernel. 2) Enable lpss_acpi_mode=1 in devicetree.cb and kernel changes to add _HID entries for devices in appropriate drivers. Ensure that the devices are probed successfully. Further changes are needed to the chromeos-touch-firmware scripts to load config and update firmware based on the new ACPI _HID entries. 3) Put touchpad in bootloader mode (by flashing bad firmware) and ensure that it is detected at address 0x25 and the firmware is able to be updated. Change-Id: I5b9b47ddc94474a677497271e963f62cb09438e0 Signed-off-by: Duncan Laurie <dlaurie@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/182259 Reviewed-by: Aaron Durbin <adurbin@chromium.org> Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/5045 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
------------------------------------------------------------------------------- coreboot README ------------------------------------------------------------------------------- coreboot is a Free Software project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload. With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required. coreboot was formerly known as LinuxBIOS. Payloads -------- After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot. See http://www.coreboot.org/Payloads for a list of supported payloads. Supported Hardware ------------------ coreboot supports a wide range of chipsets, devices, and mainboards. For details please consult: * http://www.coreboot.org/Supported_Motherboards * http://www.coreboot.org/Supported_Chipsets_and_Devices Build Requirements ------------------ * gcc / g++ * make Optional: * doxygen (for generating/viewing documentation) * iasl (for targets with ACPI support) * gdb (for better debugging facilities on some targets) * ncurses (for 'make menuconfig') * flex and bison (for regenerating parsers) Building coreboot ----------------- Please consult http://www.coreboot.org/Build_HOWTO for details. Testing coreboot Without Modifying Your Hardware ------------------------------------------------ If you want to test coreboot without any risks before you really decide to use it on your hardware, you can use the QEMU system emulator to run coreboot virtually in QEMU. Please see http://www.coreboot.org/QEMU for details. Website and Mailing List ------------------------ Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website: http://www.coreboot.org You can contact us directly on the coreboot mailing list: http://www.coreboot.org/Mailinglist Copyright and License --------------------- The copyright on coreboot is owned by quite a large number of individual developers and companies. Please check the individual source files for details. coreboot is licensed under the terms of the GNU General Public License (GPL). Some files are licensed under the "GPL (version 2, or any later version)", and some files are licensed under the "GPL, version 2". For some parts, which were derived from other projects, other (GPL-compatible) licenses may apply. Please check the individual source files for details. This makes the resulting coreboot images licensed under the GPL, version 2.