target/linux/bcm27xx/patches-6.1/950-1254-Add-pcie-32bit-dma-overlay-pi5-to-enable-32bit-DMA-o.patch

   1 From 1cdbd99f402b76c61632d09a49b20ce90af0cc72 Mon Sep 17 00:00:00 2001
   2 From: Rodrigo Rosmaninho <quico.rosmaninho@gmail.com>
   3 Date: Tue, 23 Jan 2024 18:50:19 +0000
   4 Subject: [PATCH 1254/1295] Add pcie-32bit-dma-overlay-pi5 to enable 32bit DMA
   5  on the Pi 5's external PCIe
   6
   7 Changes dma-ranges in the pcie1 component of the bcm2712 dts in order to ensure that the DMA addressing space is 32bits, at the expense of having to bounce buffers.
   8
   9 Signed-off-by: Rodrigo Rosmaninho <r.rosmaninho@ua.pt>
  10 ---
  11  arch/arm/boot/dts/overlays/Makefile           |  1 +
  12  arch/arm/boot/dts/overlays/README             |  6 +++++
  13  arch/arm/boot/dts/overlays/overlay_map.dts    |  5 ++++
  14  .../overlays/pcie-32bit-dma-pi5-overlay.dts   | 26 +++++++++++++++++++
  15  4 files changed, 38 insertions(+)
  16  create mode 100644 arch/arm/boot/dts/overlays/pcie-32bit-dma-pi5-overlay.dts
  17
  18 --- a/arch/arm/boot/dts/overlays/Makefile
  19 +++ b/arch/arm/boot/dts/overlays/Makefile
  20 @@ -182,6 +182,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  21         pca953x.dtbo \
  22         pcf857x.dtbo \
  23         pcie-32bit-dma.dtbo \
  24 +       pcie-32bit-dma-pi5.dtbo \
  25         pibell.dtbo \
  26         pifacedigital.dtbo \
  27         pifi-40.dtbo \
  28 --- a/arch/arm/boot/dts/overlays/README
  29 +++ b/arch/arm/boot/dts/overlays/README
  30 @@ -3388,6 +3388,12 @@ Load:   dtoverlay=pcie-32bit-dma
  31  Params: <None>
  32
  33
  34 +Name:   pcie-32bit-dma-pi5
  35 +Info:   Force PCIe config to support 32bit DMA addresses at the expense of
  36 +        having to bounce buffers (on the Pi 5).
  37 +Load:   dtoverlay=pcie-32bit-dma-pi5
  38 +Params: <None>
  39 +
  40  [ The pcf2127-rtc overlay has been deleted. See i2c-rtc. ]
  41
  42
  43 --- a/arch/arm/boot/dts/overlays/overlay_map.dts
  44 +++ b/arch/arm/boot/dts/overlays/overlay_map.dts
  45 @@ -185,6 +185,11 @@
  46
  47         pcie-32bit-dma {
  48                 bcm2711;
  49 +               bcm2712 = "pcie-32bit-dma-pi5";
  50 +       };
  51 +
  52 +       pcie-32bit-dma-pi5 {
  53 +               bcm2712;
  54         };
  55
  56         pi3-act-led {
  57 --- /dev/null
  58 +++ b/arch/arm/boot/dts/overlays/pcie-32bit-dma-pi5-overlay.dts
  59 @@ -0,0 +1,26 @@
  60 +/*
  61 + * pcie-32bit-dma-pi5-overlay.dts
  62 + */
  63 +
  64 +/dts-v1/;
  65 +/plugin/;
  66 +
  67 +/ {
  68 +       compatible = "brcm,bcm2712";
  69 +
  70 +       fragment@0 {
  71 +               target = <&pcie1>;
  72 +               __overlay__ {
  73 +                       /*
  74 +                        * The size of the range is rounded up to a power of 2,
  75 +                        * so the range ends up being 0-4GB, and the MSI vector
  76 +                        * gets pushed beyond 4GB.
  77 +                        */
  78 +                       #address-cells = <3>;
  79 +                       #size-cells = <2>;
  80 +                       dma-ranges = <0x02000000 0x0 0x00000000 0x0 0x00000000
  81 +                                     0x0 0x80000000>;
  82 +               };
  83 +       };
  84 +
  85 +};