[edk2-devel] [PATCH 1/1] Platform/RaspberryPi: Add linux quirk support

[Jeremy Linton]

Linux, for the time being has refused to support the Arm
standard SMCCC for PCIe configuration. Instead they
want to continue to maintain per device "quirks".

As the RPI isn't really ECAM this is a bit more
involved because the MADT can't really describe
the root port+config registers situation. Further
platforms which support the SMCCC shouldn't have
a MADT, so we need an additional way to tell linux
what it needs to know about this platform.

Signed-off-by: Jeremy Linton <jeremy.linton at arm.com>
---
 Platform/RaspberryPi/AcpiTables/Pci.asl | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/Platform/RaspberryPi/AcpiTables/Pci.asl b/Platform/RaspberryPi/AcpiTables/Pci.asl
index 34474f13ef..3e7fd0d5b7 100644
--- a/Platform/RaspberryPi/AcpiTables/Pci.asl
+++ b/Platform/RaspberryPi/AcpiTables/Pci.asl
@@ -123,6 +123,15 @@ DefinitionBlock (__FILE__, "SSDT", 5, "RPIFDN", "RPI4PCIE", 2)
         Name(_BBN, Zero) // PCI Base Bus Number
         Name(_CCA, 0)    // Mark the PCI noncoherent
 
+        Name (_DSD, Package () {
+          ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+            Package () {
+              Package () { "linux,pcie-quirk", "bcm2711" },
+              Package () { "linux,pcie-nomsi", 1 },
+            }
+        })
+
+
         // Root Complex 0
         Device (RP0) {
          Name(_ADR, 0xF0000000)    // Dev 0, Func 0
@@ -176,6 +185,18 @@ DefinitionBlock (__FILE__, "SSDT", 5, "RPIFDN", "RPI4PCIE", 2)
               2                               // SANITIZED_PCIE_MMIO_LEN + 1
               ,,,MMI1,,TypeTranslation
             )
+
+            QWordMemory ( // Root port registers, not to be used if SMCCC is utilized
+              ResourceConsumer, ,
+              MinFixed, MaxFixed,
+              NonCacheable, ReadWrite,        // cacheable? is that right?
+              0x00000000,                     // Granularity
+              0xFD500000,                     // Root port begin
+              0xFD509FFF,                     // Root port end
+              0x00000000,                     // no translation
+              0x0000A000,                     // size
+              ,,
+            )
           }) // end Name(RBUF)
 
           // Work around ASL's inability to add in a resource definition
-- 
2.13.7



-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#78746): https://edk2.groups.io/g/devel/message/78746
Mute This Topic: https://groups.io/mt/84688820/1813853
Group Owner: devel+owner at edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub [edk2-devel-archive at redhat.com]
-=-=-=-=-=-=-=-=-=-=-=-