Messages in this thread | | | Date | Tue, 8 Dec 2015 17:30:02 +0100 | Subject | Re: [PATCH] mtd: sh_flctl: pass FIFO as physical address | From | Geert Uytterhoeven <> |
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On Tue, Dec 8, 2015 at 4:38 PM, Arnd Bergmann <arnd@arndb.de> wrote: > By convention, the FIFO address we pass using dmaengine_slave_config > is a physical address in the form that is understood by the DMA > engine, as a dma_addr_t, phys_addr_t or resource_size_t. > > The sh_flctl driver however passes a virtual __iomem address that > gets cast to dma_addr_t in the slave driver. This happens to work > on shmobile because that platform sets up an identity mapping for > its MMIO regions, but such code is not portable to other platforms, > and prevents us from ever changing the platform mapping or reusing > the driver on other architectures like ARM64 that might not have the > mapping.
Note that since the removal of (ARM) sh7367/sh7377/sh7372 support, this driver is used on SH only.
I'll send a patch to update Kconfig.
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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