Hi Geert! On 2/3/20 9:34 PM, Geert Uytterhoeven wrote: > On Mon, Feb 3, 2020 at 9:21 PM John Paul Adrian Glaubitz > <glaubitz@xxxxxxxxxxxxxxxxxxx> wrote: >> On 2/3/20 2:32 PM, Geert Uytterhoeven wrote: >>> Both rspi and sh-msiof have users on legacy SH (i.e. without DT): >> >> FWIW, there is a patch set by Yoshinori Sato to add device tree support >> for classical SuperH hardware. It was never merged, unfortunately :(. > > True. Would it be possible to keep DMA support if device tree support was added for SuperH? I think Rich eventually wanted to merge the patches, there were just some minor issues with them. It would be great if we could still get them merged. I would be happy to help with the testing. >>> Anyone who cares for DMA on SuperH? >> >> What is DMA used for on SuperH? Wouldn't dropping it cut support for >> essential hardware features? > > It may make a few things slower. > > Does any of your SuperH boards use DMA? > Anything interesting in /proc or /sys w.r.t. DMA? I have: root@tirpitz:/sys> find . -iname "*dma*" ./bus/dma ./bus/dma/devices/dma0 ./bus/dma/devices/dma1 ./bus/dma/devices/dma2 ./bus/dma/devices/dma3 ./bus/dma/devices/dma4 ./bus/dma/devices/dma5 ./bus/dma/devices/dma6 ./bus/dma/devices/dma7 ./bus/dma/devices/dma8 ./bus/dma/devices/dma9 ./bus/dma/devices/dma10 ./bus/dma/devices/dma11 ./bus/platform/devices/sh_dmac ./bus/platform/devices/sh-dma-engine.0 ./bus/platform/devices/sh-dma-engine.1 ./devices/pci0000:00/0000:00:00.0/consistent_dma_mask_bits ./devices/pci0000:00/0000:00:00.0/dma_mask_bits ./devices/pci0000:00/0000:00:01.0/ata1/host0/scsi_host/host0/unchecked_isa_dma ./devices/pci0000:00/0000:00:01.0/ata1/link1/dev1.0/ata_device/dev1.0/dma_mode ./devices/pci0000:00/0000:00:01.0/ata2/host1/scsi_host/host1/unchecked_isa_dma ./devices/pci0000:00/0000:00:01.0/ata2/link2/dev2.0/ata_device/dev2.0/dma_mode ./devices/pci0000:00/0000:00:01.0/consistent_dma_mask_bits ./devices/pci0000:00/0000:00:01.0/dma_mask_bits ./devices/system/dma ./devices/system/dma/dma0 ./devices/system/dma/dma1 ./devices/system/dma/dma2 ./devices/system/dma/dma3 ./devices/system/dma/dma4 ./devices/system/dma/dma5 ./devices/system/dma/dma6 root@tirpitz:~> find /proc -iname "*dma*" /proc/dma /proc/irq/52/DMAC Address Error1 /proc/irq/33/DMAC Address Error0 /proc/sys/fs/nfs/idmap_cache_timeout find: ‘/proc/5703’: No such file or directory find: ‘/proc/5704’: No such file or directory find: ‘/proc/5705’: No such file or directory root@tirpitz:~> cat /proc/dma root@tirpitz:~> find /sys -iname "*dma*" /sys/bus/dma /sys/bus/dma/devices/dma0 /sys/bus/dma/devices/dma1 /sys/bus/dma/devices/dma2 /sys/bus/dma/devices/dma3 /sys/bus/dma/devices/dma4 /sys/bus/dma/devices/dma5 /sys/bus/dma/devices/dma6 /sys/bus/dma/devices/dma7 /sys/bus/dma/devices/dma8 /sys/bus/dma/devices/dma9 /sys/bus/dma/devices/dma10 /sys/bus/dma/devices/dma11 /sys/bus/platform/devices/sh_dmac /sys/bus/platform/devices/sh-dma-engine.0 /sys/bus/platform/devices/sh-dma-engine.1 /sys/devices/pci0000:00/0000:00:00.0/consistent_dma_mask_bits /sys/devices/pci0000:00/0000:00:00.0/dma_mask_bits /sys/devices/pci0000:00/0000:00:01.0/ata1/host0/scsi_host/host0/unchecked_isa_dma /sys/devices/pci0000:00/0000:00:01.0/ata1/link1/dev1.0/ata_device/dev1.0/dma_mode /sys/devices/pci0000:00/0000:00:01.0/ata2/host1/scsi_host/host1/unchecked_isa_dma /sys/devices/pci0000:00/0000:00:01.0/ata2/link2/dev2.0/ata_device/dev2.0/dma_mode /sys/devices/pci0000:00/0000:00:01.0/consistent_dma_mask_bits /sys/devices/pci0000:00/0000:00:01.0/dma_mask_bits /sys/devices/system/dma /sys/devices/system/dma/dma0 /sys/devices/system/dma/dma1 /sys/devices/system/dma/dma2 /sys/devices/system/dma/dma3 /sys/devices/system/dma/dma4 /sys/devices/system/dma/dma5 /sys/devices/system/dma/dma6 /sys/devices/system/dma/dma7 /sys/devices/system/dma/dma8 /sys/devices/system/dma/dma9 /sys/devices/system/dma/dma10 /sys/devices/system/dma/dma11 /sys/devices/virtual/misc/cpu_dma_latency /sys/devices/platform/sh_dmac /sys/devices/platform/sh_dmac/dma0 /sys/devices/platform/sh_dmac/dma1 /sys/devices/platform/sh_dmac/dma2 /sys/devices/platform/sh_dmac/dma3 /sys/devices/platform/sh_dmac/dma4 /sys/devices/platform/sh_dmac/dma5 /sys/devices/platform/sh_dmac/dma6 /sys/devices/platform/sh_dmac/dma7 /sys/devices/platform/sh_dmac/dma8 /sys/devices/platform/sh_dmac/dma9 /sys/devices/platform/sh_dmac/dma10 /sys/devices/platform/sh_dmac/dma11 /sys/devices/platform/r8a66597_hcd/usb1/1-1/1-1:1.0/host2/scsi_host/host2/unchecked_isa_dma /sys/devices/platform/sh-dma-engine.0 /sys/devices/platform/sh-dma-engine.1 /sys/class/misc/cpu_dma_latency /sys/module/nfs/parameters/nfs4_disable_idmapping /sys/module/nfs/parameters/nfs_idmap_cache_timeout /sys/module/libata/parameters/dma /sys/module/libata/parameters/atapi_dmadir root@tirpitz:~> On my SH-7785LCR. Adrian -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer - glaubitz@xxxxxxxxxx `. `' Freie Universitaet Berlin - glaubitz@xxxxxxxxxxxxxxxxxxx `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
