[PATCH RFC 00/12] ARM64: layerscape: make LS1046 DMA coherent

[Ahmad Fatoum]

Upstream DT changes /soc of NXP Layerscape LS1046A to be dma-coherent.
This means that:

 1) Linux v6.1 expects bootloader to configure DMA masters to snoop caches
 2) bootloader needs to skip cache maintenance when talking to DMA
    master when it has set snoop bits

This series does that and thereby restores USB functionality when
booting Linux v6.1 with barebox. For older kernels, dma-coherent is
fixed up into kernel DT, so newer barebox versions can boot both
kernels.

This series still needs some more testing, but it's fit for review IMO.

One thing I wasn't sure about is whether I need memory barriers in
dma_sync_single. I don't see the kernel using any though in the same
situation.

Let me know what you think.

Ahmad Fatoum (12):
  usb: dwc3: populate parent of xHCI dev
  usb: xhci: pass physical device to DMA API
  net: rtl8169: pass physical device for DMA API
  firmware: zynqmp-fpga: pass physical device to DMA API
  net: designware: eqos: pass physical device to DMA API
  x86: select OF_DMA_DEFAULT_COHERENT
  dma: define CONFIG_OF_DMA_COHERENCY
  RISC-V: StarFive: J7100: set /soc/dma-noncoherent
  of: populate new device_d::dma_coherent attribute
  dma: fix dma_sync when not all device DMA is equally coherent
  dma: provide of_dma_coherent_fixup helper
  ARM64: layerscape: configure all DMA masters to be cache-coherent

 arch/arm/Kconfig                            |  1 +
 arch/arm/mach-layerscape/Makefile           |  1 +
 arch/arm/mach-layerscape/dma-coherent.c     | 20 +++++++++++
 arch/arm/mach-layerscape/lowlevel-ls1046a.c | 10 +++---
 arch/riscv/Kconfig.socs                     |  1 +
 arch/riscv/dts/jh7100.dtsi                  |  1 +
 arch/x86/Kconfig                            |  1 +
 commands/devinfo.c                          |  5 +++
 drivers/base/resource.c                     |  6 ++--
 drivers/dma/Kconfig                         | 10 ++++++
 drivers/dma/Makefile                        |  1 +
 drivers/dma/map.c                           |  6 ++--
 drivers/dma/of_fixups.c                     | 16 +++++++++
 drivers/firmware/zynqmp-fpga.c              |  7 ++--
 drivers/net/designware_eqos.c               | 13 ++++---
 drivers/net/rtl8169.c                       |  9 ++---
 drivers/of/platform.c                       |  3 ++
 drivers/usb/dwc3/host.c                     |  8 ++---
 drivers/usb/host/xhci-ring.c                |  8 ++---
 drivers/usb/host/xhci.c                     |  6 +++-
 include/driver.h                            | 40 +++++++++++++++++++--
 include/of_address.h                        |  8 +++++
 include/soc/fsl/immap_lsch2.h               |  7 ++++
 23 files changed, 155 insertions(+), 33 deletions(-)
 create mode 100644 arch/arm/mach-layerscape/dma-coherent.c
 create mode 100644 drivers/dma/of_fixups.c

-- 
2.30.2