[PATCH v3 1/2] powerpc/timer - large decrementer support
bsingharora at gmail.com
Wed May 11 15:05:49 AEST 2016
On 10/05/16 14:57, Oliver O'Halloran wrote:
> POWER ISA v3 adds large decrementer (LD) mode of operation which increases
> the size of the decrementer register from 32 bits to an implementation
> defined with of up to 64 bits.
> This patch adds support for the LD on processors with the CPU_FTR_ARCH_300
> cpu feature flag set. For CPUs with this feature LD mode is enabled when
> when the ibm,dec-bits devicetree property is supplied for the boot CPU. The
> decrementer value is a signed quantity (with negative values indicating a
> pending exception) and this property is required to find the maximum
> positive decrementer value. If this property is not supplied then the
> traditional decrementer width of 32 bits is assumed and LD mode is disabled.
> This patch was based on initial work by Jack Miller.
> Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
> Cc: Michael Neuling <mikey at neuling.org>
> Cc: Balbir Singh <bsingharora at gmail.com>
> Cc: Jack Miller <jack at codezen.org>
These bits look good mostly
Reviewed-by: Balbir Singh <bsingharora at gmail.com>
More information about the Linuxppc-dev