On 10/07/2014 11:41 PM, Lina Iyer wrote:
Add cpuidle driver interface to allow cpus to go into C-States. Use the
cpuidle DT interface, common across ARM architectures, to provide the
C-State information to the cpuidle framework.
Supported modes at this time are Standby and Standalone Power Collapse.
Why not the retention mode which is in between the standby and the
retention ?
Signed-off-by: Lina Iyer <lina.iyer@xxxxxxxxxx>
---
.../bindings/arm/msm/qcom,idle-state.txt | 81 ++++++++++++++++++++++
drivers/cpuidle/Kconfig.arm | 7 ++
drivers/cpuidle/Makefile | 1 +
drivers/cpuidle/cpuidle-qcom.c | 79 +++++++++++++++++++++
4 files changed, 168 insertions(+)
create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt
create mode 100644 drivers/cpuidle/cpuidle-qcom.c
diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt b/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt
new file mode 100644
index 0000000..87f1742
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/msm/qcom,idle-state.txt
@@ -0,0 +1,81 @@
+QCOM Idle States for cpuidle driver
+
+ARM provides idle-state node to define the cpuidle states, as defined in [1].
+cpuidle-qcom is the cpuidle driver for Qualcomm SoCs and uses these idle
+states. Idle states have different enter/exit latency and residency values.
+The idle states supported by the QCOM SoC are defined as -
+
+ * Standby
+ * Retention
+ * Standalone Power Collapse (Standalone PC or SPC)
+ * Power Collapse (PC)
+
+Standby: Standby does a little more in addition to architectural clock gating.
+When the WFI instruction is executed the ARM core would gate its internal
+clocks. In addition to gating the clocks, QCOM cpus use this instruction as a
+trigger to execute the SPM state machine. The SPM state machine waits for the
+interrupt to trigger the core back in to active. This triggers the cache
+heirarchy to enter standby states, when all cpus are idle. An interrupt brings
s/heirarchy/hierarchy/
+the SPM state machine out of its wait, the next step is to ensure that the
+cache heirarchy is also out of standby, and then the cpu is allowed to resume
s/heirarchy/hierarchy/
+execution.
+
+Retention: Retention is a low power state where the core is clock gated and
+the memory and the registers associated with the core are retained. The
+voltage may be reduced to the minimum value needed to keep the processor
+registers active. The SPM should be configured to execute the retention
+sequence and would wait for interrupt, before restoring the cpu to execution
+state. Retention may have a slightly higher latency than Standby.
+
+Standalone PC: A cpu can power down and warmboot if there is a sufficient time
+between the time it enters idle and the next known wake up. SPC mode is used
+to indicate a core entering a power down state without consulting any other
+cpu or the system resources. This helps save power only on that core. The SPM
+sequence for this idle state is programmed to power down the supply to the
+core, wait for the interrupt, restore power to the core, and ensure the
^^ extra space
+system state including cache hierarchy is ready before allowing core to
+resume. Applying power and resetting the core causes the core to warmboot
^^ extra space
+back into Elevation Level (EL) which trampolines the control back to the
+kernel. Entering a power down state for the cpu, needs to be done by trapping
^^ extra space
+into a EL. Failing to do so, would result in a crash enforced by the warm boot
+code in the EL for the SoC. On SoCs with write-back L1 cache, the cache has to
+be flushed in s/w, before powering down the core.
+
+Power Collapse: This state is similar to the SPC mode, but distinguishes
+itself in that the cpu acknowledges and permits the SoC to enter deeper sleep
+modes. In a hierarchical power domain SoC, this means L2 and other caches can
+be flushed, system bus, clocks - lowered, and SoC main XO clock gated and
+voltages reduced, provided all cpus enter this state. Since the span of low
^^ extra space
+power modes possible at this state is vast, the exit latency and the residency
+of this low power mode would be considered high even though at a cpu level,
+this essentially is cpu power down. The SPM in this state also may handshake
^^ extra space
+with the Resource power manager processor in the SoC to indicate a complete
+application processor subsystem shut down.
+
+The idle-state for QCOM SoCs are distinguished by the compatible property of
+the idle-states device node.
+The devicetree representation of the idle state should be -
+
+Required properties:
+
+- compatible: Must be one of -
+ "qcom,idle-state-stby",
+ "qcom,idle-state-ret",
+ "qcom,idle-state-spc",
+ "qcom,idle-state-pc",
+ and "arm,idle-state".
+
+Other required and optional properties are specified in [1].
+
+Example:
+
+ idle-states {
+ CPU_SPC: spc {
+ compatible = "qcom,idle-state-spc", "arm,idle-state";
+ entry-latency-us = <150>;
+ exit-latency-us = <200>;
+ min-residency-us = <2000>;
+ };
+ };
+
+[1]. Documentation/devicetree/bindings/arm/idle-states.txt
diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
index 38cff69..6a9ee12 100644
--- a/drivers/cpuidle/Kconfig.arm
+++ b/drivers/cpuidle/Kconfig.arm
@@ -62,3 +62,10 @@ config ARM_MVEBU_V7_CPUIDLE
depends on ARCH_MVEBU
help
Select this to enable cpuidle on Armada 370, 38x and XP processors.
+
+config ARM_QCOM_CPUIDLE
+ bool "CPU Idle drivers for Qualcomm processors"
+ depends on QCOM_PM
+ depends on ARCH_QCOM
+ select DT_IDLE_STATES
+ help
+ Select this to enable cpuidle for QCOM processors
diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile
index 4d177b9..6c222d5 100644
--- a/drivers/cpuidle/Makefile
+++ b/drivers/cpuidle/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_ARM_ZYNQ_CPUIDLE) += cpuidle-zynq.o
obj-$(CONFIG_ARM_U8500_CPUIDLE) += cpuidle-ux500.o
obj-$(CONFIG_ARM_AT91_CPUIDLE) += cpuidle-at91.o
obj-$(CONFIG_ARM_EXYNOS_CPUIDLE) += cpuidle-exynos.o
+obj-$(CONFIG_ARM_QCOM_CPUIDLE) += cpuidle-qcom.o
###############################################################################
# MIPS drivers
diff --git a/drivers/cpuidle/cpuidle-qcom.c b/drivers/cpuidle/cpuidle-qcom.c
new file mode 100644
index 0000000..0a65065
--- /dev/null
+++ b/drivers/cpuidle/cpuidle-qcom.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2014, Linaro Limited.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/cpu_pm.h>
+#include <linux/cpuidle.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <soc/qcom/pm.h>
+#include "dt_idle_states.h"
+
+static void (*qcom_idle_enter)(enum pm_sleep_mode);
+
+static int qcom_lpm_enter_stby(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ qcom_idle_enter(PM_SLEEP_MODE_STBY);
Could you replace this function by a generic one ?
It would be nice to have qcom_cpu_standby(void) and
qcom_cpu_powerdown(void) and let behind the mysterious words 'Single
Power Collapse' in the low level code which is qcom specific :)
I guess you had to create a single "qcom_idle_enter" because of a single
pointer in the platform data. I am working on a common structure to be
shared across the drivers as a common way to pass the different
callbacks without including a soc specific header.
struct cpuidle_ops {
int (*standby)(void *data);
int (*retention)(void *data);
int (*poweroff)(void *data);
};
So maybe you can either:
1. wait I post this structure and provide the driver with this one
2. create a similar structure and I will take care to upgrade when I
post the patchset with the common structure.
The issue I see with this common structure is the initialization of the
qcom_idle_state_match array.
+ local_irq_enable();
local_irq_enable() is handled by the cpuidle framework.
Please remove all occurrences of this function in the driver otherwise
time measurement will include irq time processing and will no longer be
valid.
+ return index;
+}
+
+static int qcom_lpm_enter_spc(struct cpuidle_device *dev,
+ struct cpuidle_driver *drv, int index)
+{
+ cpu_pm_enter();
+ qcom_idle_enter(PM_SLEEP_MODE_SPC);
Where is cpu_suspend ?
+ cpu_pm_exit();
+ local_irq_enable();
+
+ return index;
+}
+
+static struct cpuidle_driver qcom_cpuidle_driver = {
+ .name = "qcom_cpuidle",
+};
+
+static const struct of_device_id qcom_idle_state_match[] = {
+ { .compatible = "qcom,idle-state-stby", .data = qcom_lpm_enter_stby},
+ { .compatible = "qcom,idle-state-spc", .data = qcom_lpm_enter_spc },
+ { },
+};
+
+static int qcom_cpuidle_probe(struct platform_device *pdev)
+{
+ struct cpuidle_driver *drv = &qcom_cpuidle_driver;
+ int ret;
+
+ qcom_idle_enter = pdev->dev.platform_data;
+ if (!qcom_idle_enter)
+ return -EFAULT;
It shouldn't fail because if the probe is called then the cpuidle device
was registered with its callback which is hardcoded.
+ /* Probe for other states, including standby */
+ ret = dt_init_idle_driver(drv, qcom_idle_state_match, 0);
Are you sure it is not worth to add the simple WFI state ? It may have
less latency than the standby mode, no ?
+ if (ret < 0)
+ return ret;
+
+ return cpuidle_register(drv, NULL);
+}
+
+static struct platform_driver qcom_cpuidle_plat_driver = {
+ .probe = qcom_cpuidle_probe,
+ .driver = {
+ .name = "qcom_cpuidle",
+ },
+};
+
+module_platform_driver(qcom_cpuidle_plat_driver);
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