1. 28 5月, 2014 1 次提交
    • P
      MIPS: pm-cps: add PM state entry code for CPS systems · 3179d37e
      Paul Burton 提交于
      This patch adds code to generate entry & exit code for various low power
      states available on systems based around the MIPS Coherent Processing
      System architecture (ie. those with a Coherence Manager, Global
      Interrupt Controller & for >=CM2 a Cluster Power Controller). States
      supported are:
      
        - Non-coherent wait. This state first leaves the coherent domain and
          then executes a regular MIPS wait instruction. Power savings are
          found from the elimination of coherency interventions between the
          core and any other coherent requestors in the system.
      
        - Clock gated. This state leaves the coherent domain and then gates
          the clock input to the core. This removes all dynamic power from the
          core but leaves the core at the mercy of another to restart its
          clock. Register state is preserved, but the core can not service
          interrupts whilst its clock is gated.
      
        - Power gated. This deepest state removes all power input to the core.
          All register state is lost and the core will restart execution from
          its BEV when another core powers it back up. Because register state
          is lost this state requires cooperation with the CONFIG_MIPS_CPS SMP
          implementation in order for the core to exit the state successfully.
      
      The code will detect which states are available on the current system
      during boot & generate the entry/exit code for those states. This will
      be used by cpuidle & hotplug implementations.
      Signed-off-by: NPaul Burton <paul.burton@imgtec.com>
      3179d37e
  2. 02 5月, 2014 1 次提交
  3. 24 4月, 2014 1 次提交
  4. 08 4月, 2014 1 次提交
  5. 01 4月, 2014 4 次提交
  6. 31 3月, 2014 1 次提交
  7. 27 3月, 2014 13 次提交
  8. 18 3月, 2014 1 次提交
  9. 17 3月, 2014 1 次提交
    • P
      MIPS: mark O32+FP64 experimental for now · 06e2e882
      Paul Burton 提交于
      Commit 597ce172 "MIPS: Support for 64-bit FP with O32 binaries"
      introduced support for setting Status.FR=1 for O32 binaries with the
      EF_MIPS_FP64 ELF header flag set. Whilst this flag is currently
      supported by binutils it does introduce an ABI break within userland.
      Objects built with EF_MIPS_FP64 cannot be safely linked with those built
      without it since code in either object may assume behaviour specific to
      a value of FR.
      
      More recently there has been discussion around avoiding further
      fragmentation of the O32 ABI whilst still allowing the use of FR=1 and
      features such as MSA which depend upon it. Details of the plan to allow
      this are still being worked on, and whilst the kernel will need the
      ability to handle FR=1 with O32 tasks it is unclear what else it may
      need to provide to a userland which seeks to avoid another ABI break. In
      order to prevent the proliferation of userland which may rely upon the
      current EF_MIPS_FP64 behaviour this patch marks the kernel support for
      it experimental & disables it by default. Under current proposals it is
      likely that this support can simply be enabled again later, but possibly
      after the introduction of further interfaces with userland and support
      for the MIPS R5 UFR feature.
      Signed-off-by: NPaul Burton <paul.burton@imgtec.com>
      Cc: Matthew Fortune <matthew.fortune@imgtec.com>
      Cc: linux-mips@linux-mips.org
      Cc: Paul Burton <paul.burton@imgtec.com>
      Patchwork: https://patchwork.linux-mips.org/patch/6549/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
      06e2e882
  10. 07 3月, 2014 3 次提交
  11. 19 2月, 2014 1 次提交
  12. 10 2月, 2014 1 次提交
    • S
      pwm: Remove obsolete HAVE_PWM Kconfig symbol · 557fe99d
      Sascha Hauer 提交于
      Before we had the PWM framework we used to have a barebone PWM api. The
      HAVE_PWM Kconfig symbol used to be selected by the PWM drivers to specify
      the PWM API is present in the kernel. Since the last legacy driver is gone
      the HAVE_PWM symbol can go aswell.
      Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
      Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
      Cc: Eric Miao <eric.y.miao@gmail.com>
      Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
      Cc: linux-arm-kernel@lists.infradead.org
      Cc: linux-kernel@vger.kernel.org
      Cc: Thierry Reding <thierry.reding@gmail.com>
      Cc: linux-pwm@vger.kernel.orig
      Cc: Russell King <linux@arm.linux.org.uk>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Signed-off-by: NThierry Reding <thierry.reding@gmail.com>
      557fe99d
  13. 25 1月, 2014 5 次提交
  14. 24 1月, 2014 2 次提交
  15. 23 1月, 2014 4 次提交