Sorry for spamming, please ignore this series. The email address I used was incorrect and also the subject. I apologize. Lina On Thu, 7 Aug 2014, Lina Iyer wrote: > Hello everybody, > > Here are the set of patches for enabling cpuidle driver for 8074 based targets. > > 8074 like any ARM SoC can do architectural clock gating, that helps save on > power, but not enough of leakage power. Leakage power of the SoC can be > further reduced by turning off power to the core. To aid this, every core (cpu > and L2) is accompanied by a Sub-system Power Manager (SPM), that can be > configured to indicate the low power mode, the core would be put into and the > SPM programs the peripheral h/w accordingly to enter low power and turn off the > power rail to the core. > > The patchsets do the following > > - Move scm-boot files from arm/mach-qcom to drivers/soc, following convention. > They are based on Stephen Boyd's series of patches > [http://www.spinics.net/lists/linux-arm-msm/msg10482.html] > > - Add new Secure Monitor flags to support warmboot of a quad core system. > > - Introduce the SPM driver to control power to the core. The SPM h/w IP works > in conjunction with the Krait CPU/L2. When the core executes WFI instruction, > the core is clockgated and the SPM state machine takes over and powers the core > down. An interrupt from GIC, resumes the SPM state machine which brings the cpu > out of the low power mode. > > - Add the device tree configuration for each of the SPM nodes. There is one for > each cpu. There is one for each cpu and one for L2 and one for L2. > > - Introduce the SoC driver interface layer to configure SPM per the core's idle > state. To power down the cpu core, the SPM h/w needs to be set up correctly > to power down the core, when the core executes WFI. Linux is expected to call > into Secure Monitor to power down the core. At reset, the core will start in > Seure mode and will be returned back to Linux. Also, when powering down the > core, let the SCM know the state of L2 as set up in Linux. This allows secure > monitor to flush the secure lines when Linux knows the cache may be powered > off. > > - Add ability to recognize the power down status of the core, to ensure that > the core is indeed powered down before powering down peripheral h/w. > > - Add support for deeper idle states than just clock gating for hotplug and warmboot > > - Add CPUIDLE driver for QCOM cpus. The cpuidle driver uses the SoC interface > layer to configure the SPM to allow Krait to be powered down. The driver > supports 4 low power modes, but not all SoCs, support all low power modes. The > modes supported are configured in device tree nodes. > > - Provide device configuration for 8074 SoC. Current support is for WFI and > standalone power collapse, which powers only the core independent of the > other cores and caches. > > - KConfig option to enable the driver > > I have tested them on the Dragonboard 8074. The drivers should be fairly > extensible to 8084. > > Thanks > Lina > > > Lina Iyer (13): > msm: scm: Move scm-boot files to drivers/soc and include/soc > msm: scm: Add SCM warmboot flags for quad core targets. > qcom: spm: Add Subsystem Power Manager driver for QCOM chipsets > arm: dts: qcom: Add SPM device bindings for 8974 > qcom: msm-pm: Add cpu low power mode functions > qcom: msm-pm: Add support for hotplug and secondary startup > qcom: sleep-status: Add ability to recognize cpu power down state > arm: dts: qcom: Add device binding for sleep status > soc: qcom: Add QCOM Power management config > qcom: platsmp: Enable deeper idle states for hotplug > qcom: cpuidle: Add cpuidle driver for QCOM cpus > qcom: cpuidle: Add cpuidle device nodes for 8974 chipset > qcom: cpuidle: Config option to enable QCOM cpuidle driver > > .../bindings/arm/msm/qcom,cpu-sleep-status.txt | 41 ++ > .../devicetree/bindings/arm/msm/qcom,cpuidle.txt | 73 +++ > .../devicetree/bindings/arm/msm/spm-v2.txt | 104 +++ > arch/arm/boot/dts/qcom-msm8974-pm.dtsi | 146 +++++ > arch/arm/boot/dts/qcom-msm8974.dtsi | 2 + > arch/arm/mach-qcom/Makefile | 1 - > arch/arm/mach-qcom/platsmp.c | 22 +- > drivers/cpuidle/Kconfig.arm | 6 + > drivers/cpuidle/Makefile | 1 + > drivers/cpuidle/cpuidle-qcom.c | 140 ++++ > drivers/soc/qcom/Kconfig | 8 + > drivers/soc/qcom/Makefile | 4 +- > drivers/soc/qcom/msm-pm.c | 254 ++++++++ > .../arm/mach-qcom => drivers/soc/qcom}/scm-boot.c | 4 +- > drivers/soc/qcom/sleep-status.c | 178 ++++++ > drivers/soc/qcom/spm.c | 559 ++++++++++++++++ > drivers/soc/qcom/spm_devices.c | 709 +++++++++++++++++++++ > drivers/soc/qcom/spm_driver.h | 118 ++++ > include/soc/qcom/pm.h | 45 ++ > .../arm/mach-qcom => include/soc/qcom}/scm-boot.h | 3 + > include/soc/qcom/spm.h | 106 +++ > 21 files changed, 2519 insertions(+), 5 deletions(-) > create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,cpu-sleep-status.txt > create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,cpuidle.txt > create mode 100644 Documentation/devicetree/bindings/arm/msm/spm-v2.txt > create mode 100644 arch/arm/boot/dts/qcom-msm8974-pm.dtsi > create mode 100644 drivers/cpuidle/cpuidle-qcom.c > create mode 100644 drivers/soc/qcom/msm-pm.c > rename {arch/arm/mach-qcom => drivers/soc/qcom}/scm-boot.c (97%) > create mode 100644 drivers/soc/qcom/sleep-status.c > create mode 100644 drivers/soc/qcom/spm.c > create mode 100644 drivers/soc/qcom/spm_devices.c > create mode 100644 drivers/soc/qcom/spm_driver.h > create mode 100644 include/soc/qcom/pm.h > rename {arch/arm/mach-qcom => include/soc/qcom}/scm-boot.h (91%) > create mode 100644 include/soc/qcom/spm.h > > -- 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
