On Friday 11 September 2009, David Gibson wrote: > On Fri, Sep 11, 2009 at 12:14:55PM +0800, g r1x wrote: > > Now, I'm writing a DMA driver on powerpc > > 440gx platform(2.6.26.5), as the only way to set up DMA Controller is > > to access it's dcr registers with 'mfdcr' and 'mtdcr'. > > > > I've found some dma code in Linux kernel 2.6.26.5, so I copy the code > > u wrote to my driver module directory, and include them, but when I > > compile my driver, gcc complains following err messages: > > In current kernels we have some DCR macros that use a big table of > pre-generated instructions in order to allow accesses to runtime > computed DCR numbers. But either they didn't exist in 2.6.26, or they > have a different name, I don't remember.
The portable way to access DCRs is the API from asm/dcr.h, using dcr_map(), dcr_read() and dcr_write(). Arnd <>< _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev