[edk2-devel] [PATCH 1/2] Platform/Raspberrypi: Update DMA constants based on SOC revision
Pete Batard
pete at akeo.ie
Wed May 12 11:19:34 UTC 2021
Two minor notes below:
On 2021.05.11 23:41, Jeremy Linton wrote:
> The newer BCM2711 SoC's don't have a DMA constraint on the emmc2
> controller. So we don't need to do the 1G translation. Lets
> allow the AML to detect the SoC revision and return a different
> _DMA resource.
>
> Signed-off-by: Jeremy Linton <jeremy.linton at arm.com>
> ---
> Platform/RaspberryPi/AcpiTables/Emmc.asl | 39 +++++++++++++++++++++-
> .../Bcm27xx/Include/IndustryStandard/Bcm2711.h | 2 ++
> 2 files changed, 40 insertions(+), 1 deletion(-)
>
> diff --git a/Platform/RaspberryPi/AcpiTables/Emmc.asl b/Platform/RaspberryPi/AcpiTables/Emmc.asl
> index 23febe37b4..c6691e81dc 100644
> --- a/Platform/RaspberryPi/AcpiTables/Emmc.asl
> +++ b/Platform/RaspberryPi/AcpiTables/Emmc.asl
> @@ -8,6 +8,7 @@
>
> #include <IndustryStandard/Bcm2836SdHost.h>
> #include <IndustryStandard/Bcm2836Sdio.h>
> +#include <IndustryStandard/Bcm2711.h>
>
> #include "AcpiTables.h"
>
> @@ -31,7 +32,8 @@ DefinitionBlock (__FILE__, "SSDT", 2, "RPIFDN", "RPI4EMMC", 2)
> Return (^RBUF)
> }
>
> - Name (_DMA, ResourceTemplate() {
> + // Translated DMA region for < C0
Even if the code makes it clear that we're testing the chip revision to
decide what region to return, I would prefer if we had "for pre C0
revisions of the SoC" instead of "for < C0", as I suspect people who
read this too quickly, and have no idea what C0, refers to may think
we're talking about a DMA address boundary or something.
> + Name (DMTR, ResourceTemplate() {
> QWordMemory (ResourceProducer,
> ,
> MinFixed,
> @@ -48,6 +50,41 @@ DefinitionBlock (__FILE__, "SSDT", 2, "RPIFDN", "RPI4EMMC", 2)
> )
> })
>
> + // Non translated DMA region for >= C0
Same as above: "for post C0 revisions of the SoC"
> + Name (DMNT, ResourceTemplate() {
> + QWordMemory (ResourceProducer,
> + ,
> + MinFixed,
> + MaxFixed,
> + NonCacheable,
> + ReadWrite,
> + 0x0,
> + 0x0000000000000000, // MIN
> + 0x000000FFFFFFFFFF, // MAX
> + 0x0000000000000000, // TRA
> + 0x0000010000000000, // LEN
> + ,
> + ,
> + )
> + })
> +
> + Method (_DMA, 0x0, Serialized)
> + {
> + OperationRegion (CHPR, SystemMemory, ID_CHIPREV, 0x4)
> + Field (CHPR, DWordAcc, NoLock, Preserve) {
> + SOCI, 32
> + }
> +
> + if ((SOCI & 0xFF) >= 0x20)
> + {
> + return (^DMNT);
> + }
> + else
> + {
> + return (^DMTR);
> + }
> + }
> +
> // emmc2 Host Controller. (brcm,bcm2711-emmc2)
> Device (SDC3)
> {
> diff --git a/Silicon/Broadcom/Bcm27xx/Include/IndustryStandard/Bcm2711.h b/Silicon/Broadcom/Bcm27xx/Include/IndustryStandard/Bcm2711.h
> index 86906b2438..8a69128d11 100644
> --- a/Silicon/Broadcom/Bcm27xx/Include/IndustryStandard/Bcm2711.h
> +++ b/Silicon/Broadcom/Bcm27xx/Include/IndustryStandard/Bcm2711.h
> @@ -88,4 +88,6 @@
>
> #define THERM_SENSOR 0xfd5d2200
>
> +#define ID_CHIPREV 0xfc404000
> +
> #endif /* BCM2711_H__ */
>
With the comment changes, if agreed, applicable during integration:
Reviewed-by: Pete Batard <pete at akeo.ie>
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