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authorStephen Neuendorffer <stephen.neuendorffer@xilinx.com>2008-05-07 04:29:17 +1000
committerJosh Boyer <jwboyer@linux.vnet.ibm.com>2008-05-29 07:06:56 -0500
commitb786af117b360843349cf66165c4efa0217ca2a7 (patch)
tree713c515b49003fe2b593703820169ffc326ed4bb /arch/powerpc/boot
parentacf464817d5e7be9fb67aec4027dbee0ac9be17a (diff)
[POWERPC] Refactor DCR code
Previously, DCR support was configured at compile time to either use MMIO or native dcr instructions. Although this works for most platforms, it fails on FPGA platforms: 1) Systems may include more than one DCR bus. 2) Systems may be native DCR capable and still use memory mapped DCR interface. This patch provides runtime support based on the device trees for the case where CONFIG_PPC_DCR_MMIO and CONFIG_PPC_DCR_NATIVE are both selected. Previously, this was a poorly defined configuration, which happened to provide NATIVE support. The runtime selection is made based on the dcr-controller having a 'dcr-access-method' attribute in the device tree. If only one of the above options is selected, then the code uses #defines to select only the used code in order to avoid introducing overhead in existing usage. Signed-off-by: Stephen Neuendorffer <stephen.neuendorffer@xilinx.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Diffstat (limited to 'arch/powerpc/boot')
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