c2891f15fd
This driver provides support for Intel SoundWire controllers. It is
intended to be used by multiple Intel SoCs and relies on retrieving
controller/master information from the SoC itself. As such it
provides a function that must be implemented by the SoC to fill out
this structure.
The Intel SoundWire driver in the Linux kernel expects firmware to
inform it which master links are unused by adding a custom property
to the link descriptor. This is done by looking for any children
attached to the device that use each link and disabling the ones
that are unused.
Mainboards will enable this driver and define the controller in
devicetree.cb in order provide the required ACPI tables, but the
mainboard should not need to provide any configuration itself as that
should all come from the SoC directly.
This was tested with the volteer board by adding this controller and a
codec to devicetree.cb and ensuring that the properties are all present,
including the custom properties for the device clock and quirk mask for
disabled links.
Device (SNDW)
{
Name (_ADR, 0x40000003)
Name (_CID, Package () { "PRP0001", "PNP0A05" })
Name (_DDN, "Intel SoundWire Controller")
Name (_DSD, Package ()
{
ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package () { "mipi-sdw-sw-interface-revision", 0x00010000 },
Package () { "mipi-sdw-master-count", 0x04 }
},
ToUUID ("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
Package () {
Package () { "mipi-sdw-link-0-subproperties", "LNK0" },
Package () { "mipi-sdw-link-1-subproperties", "LNK1" },
Package () { "mipi-sdw-link-2-subproperties", "LNK2" },
Package () { "mipi-sdw-link-3-subproperties", "LNK3" },
}
}
Name (LNK0, Package ()
{
ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package () { "mipi-sdw-clock-stop-mode0-supported", One },
[...]
Package () { "intel-sdw-ip-clock", 0x0249F000 },
Package () { "intel-quirk-mask", Zero },
}
}
[...]
}
BUG=b:146482091
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Change-Id: I4b4f843a7e5ea170b070a1697c8eedc7c103e127
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40888
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
|
||
|---|---|---|
| 3rdparty | ||
| configs | ||
| Documentation | ||
| LICENSES | ||
| payloads | ||
| src | ||
| tests | ||
| util | ||
| .checkpatch.conf | ||
| .clang-format | ||
| .editorconfig | ||
| .gitignore | ||
| .gitmodules | ||
| .gitreview | ||
| AUTHORS | ||
| COPYING | ||
| gnat.adc | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc | ||
| README.md | ||
| toolchain.inc | ||
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 https://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:
Build Requirements
- make
- gcc / g++
Because Linux distribution compilers tend to use lots of patches. coreboot
does lots of "unusual" things in its build system, some of which break due
to those patches, sometimes by gcc aborting, sometimes - and that's worse -
by generating broken object code.
Two options: use our toolchain (eg. make crosstools-i386) or enable the
ANY_TOOLCHAINKconfig option if you're feeling lucky (no support in this case). - iasl (for targets with ACPI support)
- pkg-config
- libssl-dev (openssl)
Optional:
- doxygen (for generating/viewing documentation)
- gdb (for better debugging facilities on some targets)
- ncurses (for
make menuconfigandmake nconfig) - flex and bison (for regenerating parsers)
Building coreboot
Please consult https://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 https://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:
You can contact us directly on the coreboot mailing list:
https://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.