Lina Iyer <lina.iyer@xxxxxxxxxx> writes: > On Wed, Sep 24 2014 at 12:07 -0600, Kumar Gala wrote: >> >>On Sep 23, 2014, at 6:51 PM, Lina Iyer <lina.iyer@xxxxxxxxxx> wrote: >> >>> Based on work by many authors, available at codeaurora.org >>> >>> SPM is a hardware block that controls the peripheral logic surrounding >>> the application cores (cpu/l$). When the core executes WFI instruction, >>> the SPM takes over the putting the core in low power state as >>> configured. The wake up for the SPM is an interrupt at the GIC, which >>> then completes the rest of low power mode sequence and brings the core >>> out of low power mode. >>> >>> The SPM has a set of control registers that configure the SPMs >>> individually based on the type of the core and the runtime conditions. >>> SPM is a finite state machine block to which a sequence is provided and >>> it interprets the bytes and executes them in sequence. Each low power >>> mode that the core can enter into is provided to the SPM as a sequence. >>> >>> Configure the SPM to set the core (cpu or L2) into its low power mode, >>> the index of the first command in the sequence is set in the SPM_CTL >>> register. When the core executes ARM wfi instruction, it triggers the >>> SPM state machine to start executing from that index. The SPM state >>> machine waits until the interrupt occurs and starts executing the rest >>> of the sequence until it hits the end of the sequence. The end of the >>> sequence jumps the core out of its low power mode. >>> >>> Signed-off-by: Lina Iyer <lina.iyer@xxxxxxxxxx> >>> [lina: simplify the driver for initial submission, clean up and update >>> commit text] >>> --- >>> Documentation/devicetree/bindings/arm/msm/spm.txt | 43 +++ >>> drivers/soc/qcom/Kconfig | 8 + >>> drivers/soc/qcom/Makefile | 1 + >>> drivers/soc/qcom/spm.c | 388 ++++++++++++++++++++++ >>> include/soc/qcom/spm.h | 38 +++ >>> 5 files changed, 478 insertions(+) >>> create mode 100644 Documentation/devicetree/bindings/arm/msm/spm.txt >>> create mode 100644 drivers/soc/qcom/spm.c >>> create mode 100644 include/soc/qcom/spm.h >> >>General comment, lets use qcom instead of msm for various things. >> >>[snip] >> > OK, Done. I renamed all msm_ functions to qcom_ functions as well. > Does that apply to the other parts of this series too? like the msm-pm and cpuidle layers? Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
