Platform/RaspberryPi/AcpiTables/Uart.asl | 14 ++++++++++++++ Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c | 9 +++++++++ .../RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf | 1 + Platform/RaspberryPi/RPi3/RPi3.dsc | 5 +++++ Platform/RaspberryPi/RPi4/RPi4.dsc | 5 +++++ Platform/RaspberryPi/RaspberryPi.dec | 1 + 6 files changed, 35 insertions(+)
Describe the miniuart clock frequency in a _DSD property, so that it can
be read from the Linux driver [1]
The miniuart clock frequency is the core clock frequency on the
Raspberry Pi. It can be modified by the user using the 'core_freq'
property in the config.txt file. So, we fetch it from the underlying
Raspberry Pi firmware.
[1] https://lore.kernel.org/all/20220207232129.402882-1-athierry@redhat.com/
Signed-off-by: Adrien Thierry <athierry@redhat.com>
---
V1 -> V2: added link to the Linux patch
The Linux patch [1] has been merged into Greg Kroah-Hartman's tty tree
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git/commit/?h=tty-testing&id=fcc446c8aa6303b247b0d88f460167b731265282
Platform/RaspberryPi/AcpiTables/Uart.asl | 14 ++++++++++++++
Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c | 9 +++++++++
.../RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf | 1 +
Platform/RaspberryPi/RPi3/RPi3.dsc | 5 +++++
Platform/RaspberryPi/RPi4/RPi4.dsc | 5 +++++
Platform/RaspberryPi/RaspberryPi.dec | 1 +
6 files changed, 35 insertions(+)
diff --git a/Platform/RaspberryPi/AcpiTables/Uart.asl b/Platform/RaspberryPi/AcpiTables/Uart.asl
index 974f06d3bc..ef5165be98 100644
--- a/Platform/RaspberryPi/AcpiTables/Uart.asl
+++ b/Platform/RaspberryPi/AcpiTables/Uart.asl
@@ -77,6 +77,20 @@ Device (URTM)
MEMORY32SETBASE (RBUF, RMEM, RBAS, BCM2836_MINI_UART_OFFSET)
Return (^RBUF)
}
+
+ //
+ // Mini Uart Clock Rate will be dynamically updated during boot
+ // 0x4D 0x55 0x43 0x52 0xC 0x1000000 (Value must be > 16777215)
+ //
+ Name (MUCR, 0x1000000)
+
+ Name (_DSD, Package ()
+ {
+ ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), Package ()
+ {
+ Package (2) { "clock-frequency", MUCR },
+ }
+ })
}
//
diff --git a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c
index 415d99fadb..3dcf2bac0d 100644
--- a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c
+++ b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c
@@ -44,6 +44,7 @@ STATIC RASPBERRY_PI_FIRMWARE_PROTOCOL *mFwProtocol;
STATIC UINT32 mModelFamily = 0;
STATIC UINT32 mModelInstalledMB = 0;
STATIC UINT32 mModelRevision = 0;
+STATIC UINT32 mCoreClockRate = 0;
STATIC EFI_MAC_ADDRESS mMacAddress;
@@ -798,6 +799,7 @@ STATIC CONST AML_NAME_OP_REPLACE SsdtEmmcNameOpReplace[] = {
STATIC CONST AML_NAME_OP_REPLACE DsdtNameOpReplace[] = {
{ "URIU", PcdToken (PcdUartInUse) },
+ { "MUCR", PcdToken (PcdMiniUartClockRate) },
{ }
};
@@ -944,6 +946,13 @@ ConfigInitialize (
DEBUG ((DEBUG_INFO, "Current Raspberry Pi revision %x\n", mModelRevision));
}
+ Status = mFwProtocol->GetClockRate (RPI_MBOX_CLOCK_RATE_CORE, &mCoreClockRate);
+ if (Status != EFI_SUCCESS) {
+ DEBUG ((DEBUG_ERROR, "Couldn't get the Raspberry Pi core clock rate: %r\n", Status));
+ } else {
+ PcdSet32S (PcdMiniUartClockRate, mCoreClockRate);
+ }
+
Status = SetupVariables ();
if (Status != EFI_SUCCESS) {
DEBUG ((DEBUG_ERROR, "Couldn't not setup NV vars: %r\n", Status));
diff --git a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf
index e6e22ad82e..6f6e8f42ac 100644
--- a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf
+++ b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf
@@ -95,6 +95,7 @@
gRaspberryPiTokenSpaceGuid.PcdFanTemp
gRaspberryPiTokenSpaceGuid.PcdUartInUse
gRaspberryPiTokenSpaceGuid.PcdXhciPci
+ gRaspberryPiTokenSpaceGuid.PcdMiniUartClockRate
[Depex]
gPcdProtocolGuid AND gRaspberryPiFirmwareProtocolGuid
diff --git a/Platform/RaspberryPi/RPi3/RPi3.dsc b/Platform/RaspberryPi/RPi3/RPi3.dsc
index 6ab5d1ae6d..6dc48dc233 100644
--- a/Platform/RaspberryPi/RPi3/RPi3.dsc
+++ b/Platform/RaspberryPi/RPi3/RPi3.dsc
@@ -561,6 +561,11 @@
#
gRaspberryPiTokenSpaceGuid.PcdUartInUse|1
+ #
+ # Mini-UART clock rate
+ #
+ gRaspberryPiTokenSpaceGuid.PcdMiniUartClockRate|250000000
+
################################################################################
#
# Components Section - list of all EDK II Modules needed by this Platform
diff --git a/Platform/RaspberryPi/RPi4/RPi4.dsc b/Platform/RaspberryPi/RPi4/RPi4.dsc
index 44ed60ab2f..a9c0c36bb1 100644
--- a/Platform/RaspberryPi/RPi4/RPi4.dsc
+++ b/Platform/RaspberryPi/RPi4/RPi4.dsc
@@ -580,6 +580,11 @@
#
gRaspberryPiTokenSpaceGuid.PcdUartInUse|0
+ #
+ # Mini-UART clock rate
+ #
+ gRaspberryPiTokenSpaceGuid.PcdMiniUartClockRate|500000000
+
################################################################################
#
# Components Section - list of all EDK II Modules needed by this Platform
diff --git a/Platform/RaspberryPi/RaspberryPi.dec b/Platform/RaspberryPi/RaspberryPi.dec
index 797be59274..17b6061a05 100644
--- a/Platform/RaspberryPi/RaspberryPi.dec
+++ b/Platform/RaspberryPi/RaspberryPi.dec
@@ -72,3 +72,4 @@
gRaspberryPiTokenSpaceGuid.PcdMmcEnableDma|0|UINT32|0x0000001F
gRaspberryPiTokenSpaceGuid.PcdUartInUse|1|UINT32|0x00000021
gRaspberryPiTokenSpaceGuid.PcdXhciPci|0|UINT32|0x00000022
+ gRaspberryPiTokenSpaceGuid.PcdMiniUartClockRate|0|UINT32|0x00000023
--
2.17.1
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On Tue, 8 Feb 2022 at 16:45, Adrien Thierry <athierry@redhat.com> wrote: > > Describe the miniuart clock frequency in a _DSD property, so that it can > be read from the Linux driver [1] > > The miniuart clock frequency is the core clock frequency on the > Raspberry Pi. It can be modified by the user using the 'core_freq' > property in the config.txt file. So, we fetch it from the underlying > Raspberry Pi firmware. > > [1] https://lore.kernel.org/all/20220207232129.402882-1-athierry@redhat.com/ > > Signed-off-by: Adrien Thierry <athierry@redhat.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Pushed as 824f19153f9d..b0f3f903720e Thanks, Ard. > --- > V1 -> V2: added link to the Linux patch > > The Linux patch [1] has been merged into Greg Kroah-Hartman's tty tree > https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git/commit/?h=tty-testing&id=fcc446c8aa6303b247b0d88f460167b731265282 > > Platform/RaspberryPi/AcpiTables/Uart.asl | 14 ++++++++++++++ > Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c | 9 +++++++++ > .../RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf | 1 + > Platform/RaspberryPi/RPi3/RPi3.dsc | 5 +++++ > Platform/RaspberryPi/RPi4/RPi4.dsc | 5 +++++ > Platform/RaspberryPi/RaspberryPi.dec | 1 + > 6 files changed, 35 insertions(+) > > diff --git a/Platform/RaspberryPi/AcpiTables/Uart.asl b/Platform/RaspberryPi/AcpiTables/Uart.asl > index 974f06d3bc..ef5165be98 100644 > --- a/Platform/RaspberryPi/AcpiTables/Uart.asl > +++ b/Platform/RaspberryPi/AcpiTables/Uart.asl > @@ -77,6 +77,20 @@ Device (URTM) > MEMORY32SETBASE (RBUF, RMEM, RBAS, BCM2836_MINI_UART_OFFSET) > Return (^RBUF) > } > + > + // > + // Mini Uart Clock Rate will be dynamically updated during boot > + // 0x4D 0x55 0x43 0x52 0xC 0x1000000 (Value must be > 16777215) > + // > + Name (MUCR, 0x1000000) > + > + Name (_DSD, Package () > + { > + ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), Package () > + { > + Package (2) { "clock-frequency", MUCR }, > + } > + }) > } > > // > diff --git a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c > index 415d99fadb..3dcf2bac0d 100644 > --- a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c > +++ b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.c > @@ -44,6 +44,7 @@ STATIC RASPBERRY_PI_FIRMWARE_PROTOCOL *mFwProtocol; > STATIC UINT32 mModelFamily = 0; > STATIC UINT32 mModelInstalledMB = 0; > STATIC UINT32 mModelRevision = 0; > +STATIC UINT32 mCoreClockRate = 0; > > STATIC EFI_MAC_ADDRESS mMacAddress; > > @@ -798,6 +799,7 @@ STATIC CONST AML_NAME_OP_REPLACE SsdtEmmcNameOpReplace[] = { > > STATIC CONST AML_NAME_OP_REPLACE DsdtNameOpReplace[] = { > { "URIU", PcdToken (PcdUartInUse) }, > + { "MUCR", PcdToken (PcdMiniUartClockRate) }, > { } > }; > > @@ -944,6 +946,13 @@ ConfigInitialize ( > DEBUG ((DEBUG_INFO, "Current Raspberry Pi revision %x\n", mModelRevision)); > } > > + Status = mFwProtocol->GetClockRate (RPI_MBOX_CLOCK_RATE_CORE, &mCoreClockRate); > + if (Status != EFI_SUCCESS) { > + DEBUG ((DEBUG_ERROR, "Couldn't get the Raspberry Pi core clock rate: %r\n", Status)); > + } else { > + PcdSet32S (PcdMiniUartClockRate, mCoreClockRate); > + } > + > Status = SetupVariables (); > if (Status != EFI_SUCCESS) { > DEBUG ((DEBUG_ERROR, "Couldn't not setup NV vars: %r\n", Status)); > diff --git a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf > index e6e22ad82e..6f6e8f42ac 100644 > --- a/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf > +++ b/Platform/RaspberryPi/Drivers/ConfigDxe/ConfigDxe.inf > @@ -95,6 +95,7 @@ > gRaspberryPiTokenSpaceGuid.PcdFanTemp > gRaspberryPiTokenSpaceGuid.PcdUartInUse > gRaspberryPiTokenSpaceGuid.PcdXhciPci > + gRaspberryPiTokenSpaceGuid.PcdMiniUartClockRate > > [Depex] > gPcdProtocolGuid AND gRaspberryPiFirmwareProtocolGuid > diff --git a/Platform/RaspberryPi/RPi3/RPi3.dsc b/Platform/RaspberryPi/RPi3/RPi3.dsc > index 6ab5d1ae6d..6dc48dc233 100644 > --- a/Platform/RaspberryPi/RPi3/RPi3.dsc > +++ b/Platform/RaspberryPi/RPi3/RPi3.dsc > @@ -561,6 +561,11 @@ > # > gRaspberryPiTokenSpaceGuid.PcdUartInUse|1 > > + # > + # Mini-UART clock rate > + # > + gRaspberryPiTokenSpaceGuid.PcdMiniUartClockRate|250000000 > + > ################################################################################ > # > # Components Section - list of all EDK II Modules needed by this Platform > diff --git a/Platform/RaspberryPi/RPi4/RPi4.dsc b/Platform/RaspberryPi/RPi4/RPi4.dsc > index 44ed60ab2f..a9c0c36bb1 100644 > --- a/Platform/RaspberryPi/RPi4/RPi4.dsc > +++ b/Platform/RaspberryPi/RPi4/RPi4.dsc > @@ -580,6 +580,11 @@ > # > gRaspberryPiTokenSpaceGuid.PcdUartInUse|0 > > + # > + # Mini-UART clock rate > + # > + gRaspberryPiTokenSpaceGuid.PcdMiniUartClockRate|500000000 > + > ################################################################################ > # > # Components Section - list of all EDK II Modules needed by this Platform > diff --git a/Platform/RaspberryPi/RaspberryPi.dec b/Platform/RaspberryPi/RaspberryPi.dec > index 797be59274..17b6061a05 100644 > --- a/Platform/RaspberryPi/RaspberryPi.dec > +++ b/Platform/RaspberryPi/RaspberryPi.dec > @@ -72,3 +72,4 @@ > gRaspberryPiTokenSpaceGuid.PcdMmcEnableDma|0|UINT32|0x0000001F > gRaspberryPiTokenSpaceGuid.PcdUartInUse|1|UINT32|0x00000021 > gRaspberryPiTokenSpaceGuid.PcdXhciPci|0|UINT32|0x00000022 > + gRaspberryPiTokenSpaceGuid.PcdMiniUartClockRate|0|UINT32|0x00000023 > -- > 2.17.1 > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. 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