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powerpc/4xx: Add suspend and idle support
Add suspend/resume support for 4xx compatible CPUs. See /sys/power/state for available power states configured in. Add two different idle states (idle-wait and idle-doze) controlled via sysfs. Default is idle-wait. cat /sys/devices/system/cpu/cpu0/idle [wait] doze To save additional power, use idle-doze. echo doze > /sys/devices/system/cpu/cpu0/idle cat /sys/devices/system/cpu/cpu0/idle wait [doze] Signed-off-by: Victor Gallardo <vgallardo@apm.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
This commit is contained in:
Victor Gallardo
Josh Boyer
parent
46f5221049
commit
d164f6d4f9
52
Documentation/powerpc/dts-bindings/4xx/cpm.txt
Normal file
52
Documentation/powerpc/dts-bindings/4xx/cpm.txt
Normal file
@ -0,0 +1,52 @@
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PPC4xx Clock Power Management (CPM) node
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Required properties:
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- compatible : compatible list, currently only "ibm,cpm"
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- dcr-access-method : "native"
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- dcr-reg : < DCR register range >
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Optional properties:
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- er-offset : All 4xx SoCs with a CPM controller have
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one of two different order for the CPM
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registers. Some have the CPM registers
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in the following order (ER,FR,SR). The
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others have them in the following order
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(SR,ER,FR). For the second case set
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er-offset = <1>.
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- unused-units : specifier consist of one cell. For each
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bit in the cell, the corresponding bit
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in CPM will be set to turn off unused
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devices.
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- idle-doze : specifier consist of one cell. For each
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bit in the cell, the corresponding bit
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in CPM will be set to turn off unused
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devices. This is usually just CPM[CPU].
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- standby : specifier consist of one cell. For each
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bit in the cell, the corresponding bit
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in CPM will be set on standby and
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restored on resume.
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- suspend : specifier consist of one cell. For each
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bit in the cell, the corresponding bit
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in CPM will be set on suspend (mem) and
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restored on resume. Note, for standby
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and suspend the corresponding bits can
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be different or the same. Usually for
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standby only class 2 and 3 units are set.
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However, the interface does not care.
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If they are the same, the additional
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power saving will be seeing if support
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is available to put the DDR in self
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refresh mode and any additional power
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saving techniques for the specific SoC.
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Example:
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CPM0: cpm {
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compatible = "ibm,cpm";
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dcr-access-method = "native";
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dcr-reg = <0x160 0x003>;
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er-offset = <0>;
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unused-units = <0x00000100>;
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idle-doze = <0x02000000>;
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standby = <0xfeff0000>;
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suspend = <0xfeff791d>;
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};
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@ -212,7 +212,7 @@ config ARCH_HIBERNATION_POSSIBLE
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config ARCH_SUSPEND_POSSIBLE
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def_bool y
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depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
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PPC_85xx || PPC_86xx || PPC_PSERIES
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PPC_85xx || PPC_86xx || PPC_PSERIES || 44x || 40x
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config PPC_DCR_NATIVE
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bool
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@ -598,13 +598,11 @@ config EXTRA_TARGETS
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If unsure, leave blank
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if !44x || BROKEN
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config ARCH_WANTS_FREEZER_CONTROL
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def_bool y
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depends on ADB_PMU
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source kernel/power/Kconfig
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endif
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config SECCOMP
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bool "Enable seccomp to safely compute untrusted bytecode"
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@ -685,6 +683,15 @@ config FSL_PMC
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Freescale MPC85xx/MPC86xx power management controller support
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(suspend/resume). For MPC83xx see platforms/83xx/suspend.c
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config PPC4xx_CPM
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bool
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default y
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depends on SUSPEND && (44x || 40x)
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help
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PPC4xx Clock Power Management (CPM) support (suspend/resume).
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It also enables support for two different idle states (idle-wait
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and idle-doze).
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config 4xx_SOC
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bool
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@ -1,4 +1,7 @@
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obj-$(CONFIG_44x) := misc_44x.o idle.o
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obj-$(CONFIG_44x) += misc_44x.o
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ifneq ($(CONFIG_PPC4xx_CPM),y)
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obj-$(CONFIG_44x) += idle.o
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endif
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obj-$(CONFIG_PPC44x_SIMPLE) += ppc44x_simple.o
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obj-$(CONFIG_EBONY) += ebony.o
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obj-$(CONFIG_SAM440EP) += sam440ep.o
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@ -41,6 +41,7 @@ obj-$(CONFIG_OF_RTC) += of_rtc.o
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ifeq ($(CONFIG_PCI),y)
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obj-$(CONFIG_4xx) += ppc4xx_pci.o
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endif
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obj-$(CONFIG_PPC4xx_CPM) += ppc4xx_cpm.o
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obj-$(CONFIG_PPC4xx_GPIO) += ppc4xx_gpio.o
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obj-$(CONFIG_CPM) += cpm_common.o
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346
arch/powerpc/sysdev/ppc4xx_cpm.c
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346
arch/powerpc/sysdev/ppc4xx_cpm.c
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@ -0,0 +1,346 @@
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/*
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* PowerPC 4xx Clock and Power Management
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*
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* Copyright (C) 2010, Applied Micro Circuits Corporation
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* Victor Gallardo (vgallardo@apm.com)
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*
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* Based on arch/powerpc/platforms/44x/idle.c:
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* Jerone Young <jyoung5@us.ibm.com>
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* Copyright 2008 IBM Corp.
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*
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* Based on arch/powerpc/sysdev/fsl_pmc.c:
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* Anton Vorontsov <avorontsov@ru.mvista.com>
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* Copyright 2009 MontaVista Software, Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <linux/kernel.h>
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#include <linux/of_platform.h>
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#include <linux/sysfs.h>
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#include <linux/cpu.h>
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#include <linux/suspend.h>
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#include <asm/dcr.h>
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#include <asm/dcr-native.h>
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#include <asm/machdep.h>
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#define CPM_ER 0
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#define CPM_FR 1
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#define CPM_SR 2
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#define CPM_IDLE_WAIT 0
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#define CPM_IDLE_DOZE 1
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struct cpm {
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dcr_host_t dcr_host;
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unsigned int dcr_offset[3];
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unsigned int powersave_off;
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unsigned int unused;
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unsigned int idle_doze;
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unsigned int standby;
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unsigned int suspend;
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};
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static struct cpm cpm;
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struct cpm_idle_mode {
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unsigned int enabled;
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const char *name;
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};
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static struct cpm_idle_mode idle_mode[] = {
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[CPM_IDLE_WAIT] = { 1, "wait" }, /* default */
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[CPM_IDLE_DOZE] = { 0, "doze" },
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};
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static unsigned int cpm_set(unsigned int cpm_reg, unsigned int mask)
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{
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unsigned int value;
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/* CPM controller supports 3 different types of sleep interface
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* known as class 1, 2 and 3. For class 1 units, they are
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* unconditionally put to sleep when the corresponding CPM bit is
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* set. For class 2 and 3 units this is not case; if they can be
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* put to to sleep, they will. Here we do not verify, we just
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* set them and expect them to eventually go off when they can.
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*/
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value = dcr_read(cpm.dcr_host, cpm.dcr_offset[cpm_reg]);
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dcr_write(cpm.dcr_host, cpm.dcr_offset[cpm_reg], value | mask);
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/* return old state, to restore later if needed */
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return value;
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}
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static void cpm_idle_wait(void)
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{
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unsigned long msr_save;
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/* save off initial state */
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msr_save = mfmsr();
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/* sync required when CPM0_ER[CPU] is set */
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mb();
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/* set wait state MSR */
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mtmsr(msr_save|MSR_WE|MSR_EE|MSR_CE|MSR_DE);
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isync();
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/* return to initial state */
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mtmsr(msr_save);
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isync();
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}
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static void cpm_idle_sleep(unsigned int mask)
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{
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unsigned int er_save;
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/* update CPM_ER state */
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er_save = cpm_set(CPM_ER, mask);
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/* go to wait state so that CPM0_ER[CPU] can take effect */
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cpm_idle_wait();
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/* restore CPM_ER state */
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dcr_write(cpm.dcr_host, cpm.dcr_offset[CPM_ER], er_save);
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}
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static void cpm_idle_doze(void)
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{
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cpm_idle_sleep(cpm.idle_doze);
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}
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static void cpm_idle_config(int mode)
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{
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int i;
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if (idle_mode[mode].enabled)
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return;
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for (i = 0; i < ARRAY_SIZE(idle_mode); i++)
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idle_mode[i].enabled = 0;
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idle_mode[mode].enabled = 1;
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}
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static ssize_t cpm_idle_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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char *s = buf;
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int i;
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for (i = 0; i < ARRAY_SIZE(idle_mode); i++) {
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if (idle_mode[i].enabled)
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s += sprintf(s, "[%s] ", idle_mode[i].name);
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else
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s += sprintf(s, "%s ", idle_mode[i].name);
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}
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*(s-1) = '\n'; /* convert the last space to a newline */
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return s - buf;
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}
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static ssize_t cpm_idle_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t n)
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{
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int i;
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char *p;
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int len;
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p = memchr(buf, '\n', n);
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len = p ? p - buf : n;
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for (i = 0; i < ARRAY_SIZE(idle_mode); i++) {
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if (strncmp(buf, idle_mode[i].name, len) == 0) {
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cpm_idle_config(i);
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return n;
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}
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}
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return -EINVAL;
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}
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static struct kobj_attribute cpm_idle_attr =
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__ATTR(idle, 0644, cpm_idle_show, cpm_idle_store);
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static void cpm_idle_config_sysfs(void)
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{
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struct sys_device *sys_dev;
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unsigned long ret;
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sys_dev = get_cpu_sysdev(0);
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ret = sysfs_create_file(&sys_dev->kobj,
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&cpm_idle_attr.attr);
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if (ret)
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printk(KERN_WARNING
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"cpm: failed to create idle sysfs entry\n");
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}
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static void cpm_idle(void)
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{
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if (idle_mode[CPM_IDLE_DOZE].enabled)
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cpm_idle_doze();
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else
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cpm_idle_wait();
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}
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static int cpm_suspend_valid(suspend_state_t state)
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{
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switch (state) {
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case PM_SUSPEND_STANDBY:
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return !!cpm.standby;
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case PM_SUSPEND_MEM:
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return !!cpm.suspend;
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default:
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return 0;
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}
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}
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static void cpm_suspend_standby(unsigned int mask)
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{
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unsigned long tcr_save;
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/* disable decrement interrupt */
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tcr_save = mfspr(SPRN_TCR);
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mtspr(SPRN_TCR, tcr_save & ~TCR_DIE);
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/* go to sleep state */
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cpm_idle_sleep(mask);
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/* restore decrement interrupt */
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mtspr(SPRN_TCR, tcr_save);
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}
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static int cpm_suspend_enter(suspend_state_t state)
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{
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switch (state) {
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case PM_SUSPEND_STANDBY:
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cpm_suspend_standby(cpm.standby);
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break;
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case PM_SUSPEND_MEM:
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cpm_suspend_standby(cpm.suspend);
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break;
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}
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return 0;
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}
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static struct platform_suspend_ops cpm_suspend_ops = {
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.valid = cpm_suspend_valid,
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.enter = cpm_suspend_enter,
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};
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static int cpm_get_uint_property(struct device_node *np,
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const char *name)
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{
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int len;
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const unsigned int *prop = of_get_property(np, name, &len);
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if (prop == NULL || len < sizeof(u32))
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return 0;
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return *prop;
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}
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static int __init cpm_init(void)
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{
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struct device_node *np;
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int dcr_base, dcr_len;
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int ret = 0;
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if (!cpm.powersave_off) {
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cpm_idle_config(CPM_IDLE_WAIT);
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ppc_md.power_save = &cpm_idle;
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}
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np = of_find_compatible_node(NULL, NULL, "ibm,cpm");
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if (!np) {
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ret = -EINVAL;
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goto out;
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}
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dcr_base = dcr_resource_start(np, 0);
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dcr_len = dcr_resource_len(np, 0);
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if (dcr_base == 0 || dcr_len == 0) {
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printk(KERN_ERR "cpm: could not parse dcr property for %s\n",
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np->full_name);
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ret = -EINVAL;
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goto out;
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}
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cpm.dcr_host = dcr_map(np, dcr_base, dcr_len);
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if (!DCR_MAP_OK(cpm.dcr_host)) {
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printk(KERN_ERR "cpm: failed to map dcr property for %s\n",
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np->full_name);
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ret = -EINVAL;
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goto out;
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}
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/* All 4xx SoCs with a CPM controller have one of two
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* different order for the CPM registers. Some have the
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* CPM registers in the following order (ER,FR,SR). The
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* others have them in the following order (SR,ER,FR).
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*/
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if (cpm_get_uint_property(np, "er-offset") == 0) {
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cpm.dcr_offset[CPM_ER] = 0;
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cpm.dcr_offset[CPM_FR] = 1;
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cpm.dcr_offset[CPM_SR] = 2;
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} else {
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cpm.dcr_offset[CPM_ER] = 1;
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cpm.dcr_offset[CPM_FR] = 2;
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cpm.dcr_offset[CPM_SR] = 0;
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}
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/* Now let's see what IPs to turn off for the following modes */
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cpm.unused = cpm_get_uint_property(np, "unused-units");
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cpm.idle_doze = cpm_get_uint_property(np, "idle-doze");
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cpm.standby = cpm_get_uint_property(np, "standby");
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cpm.suspend = cpm_get_uint_property(np, "suspend");
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/* If some IPs are unused let's turn them off now */
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if (cpm.unused) {
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cpm_set(CPM_ER, cpm.unused);
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cpm_set(CPM_FR, cpm.unused);
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}
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/* Now let's export interfaces */
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if (!cpm.powersave_off && cpm.idle_doze)
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cpm_idle_config_sysfs();
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if (cpm.standby || cpm.suspend)
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suspend_set_ops(&cpm_suspend_ops);
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out:
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if (np)
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of_node_put(np);
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return ret;
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}
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late_initcall(cpm_init);
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static int __init cpm_powersave_off(char *arg)
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{
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cpm.powersave_off = 1;
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return 0;
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}
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__setup("powersave=off", cpm_powersave_off);
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