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| author | Patrick Rudolph <patrick.rudolph@9elements.com> | 2019-12-10 14:12:03 +0100 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2019-12-22 13:47:55 +0000 |
| commit | 95bff2e17e8b9e84e588aeb9504e086174edd0b0 (patch) | |
| tree | 8d9a9540beb0cb4be19085d36ac54854f5076b4a /Documentation/superio | |
| parent | 7db16ddc8879a5b5acb7681135c7d9439dd1bd99 (diff) | |
| download | coreboot-95bff2e17e8b9e84e588aeb9504e086174edd0b0.tar.xz | |
superio/common: Add more ACPI methods
* Make use of introduced SSDT config mode access
* Make use of introduced SSDT mutex
* Provide ACPI functions to safely access SIO config space
* Implement method to query LDN enable state
* Implement method to set LDN enable state
* Use introduced functions to implement _DIS and _STA in the device
* Update documentation
Tested on Aspeed AST2500 and Linux 5.2.
Manually verified ACPI code that generates no errors in Linux.
Change-Id: I520b29de925f368cd71ff8f1f58d2d57d72eff8d
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37640
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Diffstat (limited to 'Documentation/superio')
| -rw-r--r-- | Documentation/superio/common/ssdt.md | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/Documentation/superio/common/ssdt.md b/Documentation/superio/common/ssdt.md index f2bb3346a0..2f4049ef12 100644 --- a/Documentation/superio/common/ssdt.md +++ b/Documentation/superio/common/ssdt.md @@ -45,12 +45,33 @@ chip superio/common end ``` +## Automatically generated methods + +The following methods are generated for each SuperIO: +## AMTX() +Acquire the global mutex and enter config mode. +It's called this at the begining of an atomic operation to make sure +no other ACPI code messes with the config space while working on it. + +## RMTX() +Exit config mode and release the global mutex. +It's called at the end of an atomic operation. + +## SLDN(Arg0) +Selects the (virtual) LDN given as Arg0. +This method isn't guarded with the global mutex. + +## DLDN(Arg0) +Disables the (virtual) LDN given as Arg0. +This method aquires the global mutex. + +## QLDN(Arg0) +Queries the state of the (virtual) LDN given as Arg0. +This method quires the global mutex. + ## TODO 1) Add ACPI HIDs to every SuperIO driver -2) Don't guess ACPI HID of LDNs if it's known -3) Add "enter config" and "exit config" bytes -4) Generate support methods that allow +2) Generate support methods that allow * Setting resource settings at runtime * Getting resource settings at runtime - * Disabling LDNs at runtime |