This series add low power timer as boadcast clockevent device.
Low power timer could runs even when CPUs are in idle mode and
could wakeup them.
version 5:
- document interrupts and interrupt-names bindings
- use a different wake up interrupt
- add device-tree patch
- make STM32MP157 select low power timer configuration flag
- enable fast_io in regmap configuration
version 4:
- move defines in mfd/stm32-lptimer.h
- change compatible and subnode names
- document wakeup-source property
- reword commit message
- make driver Kconfig depends of MFD_STM32_LPTIMER
- remove useless include
- remove rate and clk fields from the private structure
- to add comments about the registers sequence in stm32_clkevent_lp_set_timer
- rework probe function and use devm_request_irq()
- do not allow module to be removed
version 3:
- fix timer set sequence
- don't forget to free irq on remove function
- use devm_kzalloc to simplify errors handling in probe function
version 2:
- stm32 clkevent driver is now a child of the stm32 lp timer node
- add a probe function and adpat the driver to use regmap provide
by it parent
- stop using timer_of helpers
Benjamin Gaignard (6):
dt-bindings: mfd: Document STM32 low power timer bindings
ARM: dts: stm32: Add timer subnodes on stm32mp15 SoCs
mfd: stm32: Add defines to be used for clkevent purpose
mfd: stm32: enable regmap fast_io for stm32-lptimer
clocksource: Add Low Power STM32 timers driver
ARM: mach-stm32: select low power timer for STM32MP157
.../devicetree/bindings/mfd/st,stm32-lptimer.yaml | 34 +++
arch/arm/boot/dts/stm32mp151.dtsi | 45 ++++
arch/arm/mach-stm32/Kconfig | 1 +
drivers/clocksource/Kconfig | 4 +
drivers/clocksource/Makefile | 1 +
drivers/clocksource/timer-stm32-lp.c | 231 +++++++++++++++++++++
drivers/mfd/stm32-lptimer.c | 1 +
include/linux/mfd/stm32-lptimer.h | 5 +
8 files changed, 322 insertions(+)
create mode 100644 drivers/clocksource/timer-stm32-lp.c
--
2.15.0
Add defines to be able to enable/clear irq and configure one shot mode.
Signed-off-by: Benjamin Gaignard <[email protected]>
Acked-by: Lee Jones <[email protected]>
---
version 5:
- no change
version 4:
- move defines in mfd/stm32-lptimer.h
include/linux/mfd/stm32-lptimer.h | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/include/linux/mfd/stm32-lptimer.h b/include/linux/mfd/stm32-lptimer.h
index 605f62264825..90b20550c1c8 100644
--- a/include/linux/mfd/stm32-lptimer.h
+++ b/include/linux/mfd/stm32-lptimer.h
@@ -27,10 +27,15 @@
#define STM32_LPTIM_CMPOK BIT(3)
/* STM32_LPTIM_ICR - bit fields */
+#define STM32_LPTIM_ARRMCF BIT(1)
#define STM32_LPTIM_CMPOKCF_ARROKCF GENMASK(4, 3)
+/* STM32_LPTIM_IER - bit flieds */
+#define STM32_LPTIM_ARRMIE BIT(1)
+
/* STM32_LPTIM_CR - bit fields */
#define STM32_LPTIM_CNTSTRT BIT(2)
+#define STM32_LPTIM_SNGSTRT BIT(1)
#define STM32_LPTIM_ENABLE BIT(0)
/* STM32_LPTIM_CFGR - bit fields */
--
2.15.0
From: Benjamin Gaignard <[email protected]>
Implement clock event driver using low power STM32 timers.
Low power timer counters running even when CPUs are stopped.
It could be used as clock event broadcaster to wake up CPUs but not like
a clocksource because each it rise an interrupt the counter restart from 0.
Low power timers have a 16 bits counter and a prescaler which allow to
divide the clock per power of 2 to up 128 to target a 32KHz rate.
Signed-off-by: Benjamin Gaignard <[email protected]>
Signed-off-by: Pascal Paillet <[email protected]>
---
version 5:
- use a dedicated wake up interrupt
version 4:
- move defines in mfd/stm32-lptimer.h
- change compatiblename
- reword commit message
- make driver Kconfig depends of MFD_STM32_LPTIMER
- remove useless include
- remove rate and clk fields from the private structure
- to add comments about the registers sequence in stm32_clkevent_lp_set_timer
- rework probe function and use devm_request_irq()
- do not allow module to be removed
- make sure that wakeup interrupt is set
drivers/clocksource/Kconfig | 4 +
drivers/clocksource/Makefile | 1 +
drivers/clocksource/timer-stm32-lp.c | 231 +++++++++++++++++++++++++++++++++++
3 files changed, 236 insertions(+)
create mode 100644 drivers/clocksource/timer-stm32-lp.c
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index cc909e465823..f340a64286ef 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -292,6 +292,10 @@ config CLKSRC_STM32
select CLKSRC_MMIO
select TIMER_OF
+config CLKSRC_STM32_LP
+ bool "Low power clocksource for STM32 SoCs"
+ depends on MFD_STM32_LPTIMER || COMPILE_TEST
+
config CLKSRC_MPS2
bool "Clocksource for MPS2 SoCs" if COMPILE_TEST
depends on GENERIC_SCHED_CLOCK
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 713686faa549..c00fffbd4769 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_BCM_KONA_TIMER) += bcm_kona_timer.o
obj-$(CONFIG_CADENCE_TTC_TIMER) += timer-cadence-ttc.o
obj-$(CONFIG_CLKSRC_EFM32) += timer-efm32.o
obj-$(CONFIG_CLKSRC_STM32) += timer-stm32.o
+obj-$(CONFIG_CLKSRC_STM32_LP) += timer-stm32-lp.o
obj-$(CONFIG_CLKSRC_EXYNOS_MCT) += exynos_mct.o
obj-$(CONFIG_CLKSRC_LPC32XX) += timer-lpc32xx.o
obj-$(CONFIG_CLKSRC_MPS2) += mps2-timer.o
diff --git a/drivers/clocksource/timer-stm32-lp.c b/drivers/clocksource/timer-stm32-lp.c
new file mode 100644
index 000000000000..6235ea35f1fe
--- /dev/null
+++ b/drivers/clocksource/timer-stm32-lp.c
@@ -0,0 +1,231 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) STMicroelectronics 2019 - All Rights Reserved
+ * Authors: Benjamin Gaignard <[email protected]> for STMicroelectronics.
+ * Pascal Paillet <[email protected]> for STMicroelectronics.
+ */
+
+#include <linux/clk.h>
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/stm32-lptimer.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/pm_wakeirq.h>
+
+#define CFGR_PSC_OFFSET 9
+#define STM32_LP_RATING 400
+#define STM32_TARGET_CLKRATE (32000 * HZ)
+#define STM32_LP_MAX_PSC 7
+
+struct stm32_lp_private {
+ struct regmap *reg;
+ struct clock_event_device clkevt;
+ unsigned long period;
+ struct device *dev;
+};
+
+static struct stm32_lp_private*
+to_priv(struct clock_event_device *clkevt)
+{
+ return container_of(clkevt, struct stm32_lp_private, clkevt);
+}
+
+static int stm32_clkevent_lp_shutdown(struct clock_event_device *clkevt)
+{
+ struct stm32_lp_private *priv = to_priv(clkevt);
+
+ regmap_write(priv->reg, STM32_LPTIM_CR, 0);
+ regmap_write(priv->reg, STM32_LPTIM_IER, 0);
+ /* clear pending flags */
+ regmap_write(priv->reg, STM32_LPTIM_ICR, STM32_LPTIM_ARRMCF);
+
+ return 0;
+}
+
+static int stm32_clkevent_lp_set_timer(unsigned long evt,
+ struct clock_event_device *clkevt,
+ int is_periodic)
+{
+ struct stm32_lp_private *priv = to_priv(clkevt);
+
+ /* disable LPTIMER to be able to write into IER register*/
+ regmap_write(priv->reg, STM32_LPTIM_CR, 0);
+ /* enable ARR interrupt */
+ regmap_write(priv->reg, STM32_LPTIM_IER, STM32_LPTIM_ARRMIE);
+ /* enable LPTIMER to be able to write into ARR register */
+ regmap_write(priv->reg, STM32_LPTIM_CR, STM32_LPTIM_ENABLE);
+ /* set next event counter */
+ regmap_write(priv->reg, STM32_LPTIM_ARR, evt);
+
+ /* start counter */
+ if (is_periodic)
+ regmap_write(priv->reg, STM32_LPTIM_CR,
+ STM32_LPTIM_CNTSTRT | STM32_LPTIM_ENABLE);
+ else
+ regmap_write(priv->reg, STM32_LPTIM_CR,
+ STM32_LPTIM_SNGSTRT | STM32_LPTIM_ENABLE);
+
+ return 0;
+}
+
+static int stm32_clkevent_lp_set_next_event(unsigned long evt,
+ struct clock_event_device *clkevt)
+{
+ return stm32_clkevent_lp_set_timer(evt, clkevt,
+ clockevent_state_periodic(clkevt));
+}
+
+static int stm32_clkevent_lp_set_periodic(struct clock_event_device *clkevt)
+{
+ struct stm32_lp_private *priv = to_priv(clkevt);
+
+ return stm32_clkevent_lp_set_timer(priv->period, clkevt, true);
+}
+
+static int stm32_clkevent_lp_set_oneshot(struct clock_event_device *clkevt)
+{
+ struct stm32_lp_private *priv = to_priv(clkevt);
+
+ return stm32_clkevent_lp_set_timer(priv->period, clkevt, false);
+}
+
+static irqreturn_t stm32_clkevent_lp_irq_handler(int irq, void *dev_id)
+{
+ struct clock_event_device *clkevt = (struct clock_event_device *)dev_id;
+ struct stm32_lp_private *priv = to_priv(clkevt);
+
+ regmap_write(priv->reg, STM32_LPTIM_ICR, STM32_LPTIM_ARRMCF);
+
+ if (clkevt->event_handler)
+ clkevt->event_handler(clkevt);
+
+ return IRQ_HANDLED;
+}
+
+static void stm32_clkevent_lp_set_prescaler(struct stm32_lp_private *priv,
+ unsigned long *rate)
+{
+ int i;
+
+ for (i = 0; i <= STM32_LP_MAX_PSC; i++) {
+ if (DIV_ROUND_CLOSEST(*rate, 1 << i) < STM32_TARGET_CLKRATE)
+ break;
+ }
+
+ regmap_write(priv->reg, STM32_LPTIM_CFGR, i << CFGR_PSC_OFFSET);
+
+ /* Adjust rate and period given the prescaler value */
+ *rate = DIV_ROUND_CLOSEST(*rate, (1 << i));
+ priv->period = DIV_ROUND_UP(*rate, HZ);
+}
+
+static void stm32_clkevent_lp_init(struct stm32_lp_private *priv,
+ struct device_node *np, unsigned long rate)
+{
+ priv->clkevt.name = np->full_name;
+ priv->clkevt.cpumask = cpu_possible_mask;
+ priv->clkevt.features = CLOCK_EVT_FEAT_PERIODIC |
+ CLOCK_EVT_FEAT_ONESHOT;
+ priv->clkevt.set_state_shutdown = stm32_clkevent_lp_shutdown;
+ priv->clkevt.set_state_periodic = stm32_clkevent_lp_set_periodic;
+ priv->clkevt.set_state_oneshot = stm32_clkevent_lp_set_oneshot;
+ priv->clkevt.set_next_event = stm32_clkevent_lp_set_next_event;
+ priv->clkevt.rating = STM32_LP_RATING;
+
+ clockevents_config_and_register(&priv->clkevt, rate, 0x1,
+ STM32_LPTIM_MAX_ARR);
+}
+
+static int stm32_clkevent_lp_probe(struct platform_device *pdev)
+{
+ struct stm32_lptimer *ddata = dev_get_drvdata(pdev->dev.parent);
+ struct stm32_lp_private *priv;
+ unsigned long rate;
+ int ret, irq;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->reg = ddata->regmap;
+ ret = clk_prepare_enable(ddata->clk);
+ if (ret)
+ return -EINVAL;
+
+ rate = clk_get_rate(ddata->clk);
+ if (!rate) {
+ ret = -EINVAL;
+ goto out_clk_disable;
+ }
+
+ irq = platform_get_irq_byname(to_platform_device(pdev->dev.parent),
+ "event");
+ if (irq <= 0) {
+ ret = irq;
+ goto out_clk_disable;
+ }
+
+ if (of_property_read_bool(pdev->dev.parent->of_node, "wakeup-source")) {
+ int wakeup = platform_get_irq_byname(
+ to_platform_device(pdev->dev.parent),
+ "wakeup");
+
+ if (wakeup <= 0) {
+ ret = wakeup;
+ goto out_clk_disable;
+ }
+
+ ret = device_init_wakeup(&pdev->dev, true);
+ if (ret)
+ goto out_clk_disable;
+
+ ret = dev_pm_set_wake_irq(&pdev->dev, wakeup);
+ if (ret)
+ goto out_clk_disable;
+ }
+
+ ret = devm_request_irq(&pdev->dev, irq, stm32_clkevent_lp_irq_handler,
+ IRQF_TIMER, pdev->name, &priv->clkevt);
+ if (ret)
+ goto out_clk_disable;
+
+ stm32_clkevent_lp_set_prescaler(priv, &rate);
+
+ stm32_clkevent_lp_init(priv, pdev->dev.parent->of_node, rate);
+
+ priv->dev = &pdev->dev;
+
+ return 0;
+
+out_clk_disable:
+ clk_disable_unprepare(ddata->clk);
+ return ret;
+}
+
+static int stm32_clkevent_lp_remove(struct platform_device *pdev)
+{
+ return -EBUSY; /* cannot unregister clockevent */
+}
+
+static const struct of_device_id stm32_clkevent_lp_of_match[] = {
+ { .compatible = "st,stm32-lptimer-timer", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, stm32_clkevent_lp_of_match);
+
+static struct platform_driver stm32_clkevent_lp_driver = {
+ .probe = stm32_clkevent_lp_probe,
+ .remove = stm32_clkevent_lp_remove,
+ .driver = {
+ .name = "stm32-lptimer-timer",
+ .of_match_table = of_match_ptr(stm32_clkevent_lp_of_match),
+ },
+};
+module_platform_driver(stm32_clkevent_lp_driver);
+
+MODULE_ALIAS("platform:stm32-lptimer-timer");
+MODULE_DESCRIPTION("STMicroelectronics STM32 clockevent low power driver");
+MODULE_LICENSE("GPL v2");
--
2.15.0
Add timer subnode and interrupts to low power timer nodes for
all stm32mp15x SoCs.
Signed-off-by: Benjamin Gaignard <[email protected]>
---
arch/arm/boot/dts/stm32mp151.dtsi | 45 +++++++++++++++++++++++++++++++++++++++
1 file changed, 45 insertions(+)
diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
index fb41d0778b00..424925068baf 100644
--- a/arch/arm/boot/dts/stm32mp151.dtsi
+++ b/arch/arm/boot/dts/stm32mp151.dtsi
@@ -358,6 +358,10 @@
reg = <0x40009000 0x400>;
clocks = <&rcc LPTIM1_K>;
clock-names = "mux";
+ interrupt-names = "event", "wakeup";
+ interrupts-extended = <&intc GIC_SPI 93 IRQ_TYPE_LEVEL_HIGH>,
+ <&exti 47 IRQ_TYPE_LEVEL_HIGH>;
+ wakeup-source;
status = "disabled";
pwm {
@@ -376,6 +380,11 @@
compatible = "st,stm32-lptimer-counter";
status = "disabled";
};
+
+ timer {
+ compatible = "st,stm32-lptimer-timer";
+ status = "disabled";
+ };
};
spi2: spi@4000b000 {
@@ -1135,6 +1144,10 @@
reg = <0x50021000 0x400>;
clocks = <&rcc LPTIM2_K>;
clock-names = "mux";
+ interrupt-names = "event", "wakeup";
+ interrupts-extended = <&intc GIC_SPI 138 IRQ_TYPE_LEVEL_HIGH>,
+ <&exti 48 IRQ_TYPE_LEVEL_HIGH>;
+ wakeup-source;
status = "disabled";
pwm {
@@ -1153,6 +1166,11 @@
compatible = "st,stm32-lptimer-counter";
status = "disabled";
};
+
+ timer {
+ compatible = "st,stm32-lptimer-timer";
+ status = "disabled";
+ };
};
lptimer3: timer@50022000 {
@@ -1162,6 +1180,10 @@
reg = <0x50022000 0x400>;
clocks = <&rcc LPTIM3_K>;
clock-names = "mux";
+ interrupt-names = "event", "wakeup";
+ interrupts-extended = <&intc GIC_SPI 139 IRQ_TYPE_LEVEL_HIGH>,
+ <&exti 50 IRQ_TYPE_LEVEL_HIGH>;
+ wakeup-source;
status = "disabled";
pwm {
@@ -1175,6 +1197,11 @@
reg = <2>;
status = "disabled";
};
+
+ timer {
+ compatible = "st,stm32-lptimer-timer";
+ status = "disabled";
+ };
};
lptimer4: timer@50023000 {
@@ -1182,6 +1209,10 @@
reg = <0x50023000 0x400>;
clocks = <&rcc LPTIM4_K>;
clock-names = "mux";
+ interrupt-names = "event", "wakeup";
+ interrupts-extended = <&intc GIC_SPI 140 IRQ_TYPE_LEVEL_HIGH>,
+ <&exti 52 IRQ_TYPE_LEVEL_HIGH>;
+ wakeup-source;
status = "disabled";
pwm {
@@ -1189,6 +1220,11 @@
#pwm-cells = <3>;
status = "disabled";
};
+
+ timer {
+ compatible = "st,stm32-lptimer-timer";
+ status = "disabled";
+ };
};
lptimer5: timer@50024000 {
@@ -1196,6 +1232,10 @@
reg = <0x50024000 0x400>;
clocks = <&rcc LPTIM5_K>;
clock-names = "mux";
+ interrupt-names = "event", "wakeup";
+ interrupts-extended = <&intc GIC_SPI 141 IRQ_TYPE_LEVEL_HIGH>,
+ <&exti 53 IRQ_TYPE_LEVEL_HIGH>;
+ wakeup-source;
status = "disabled";
pwm {
@@ -1203,6 +1243,11 @@
#pwm-cells = <3>;
status = "disabled";
};
+
+ timer {
+ compatible = "st,stm32-lptimer-timer";
+ status = "disabled";
+ };
};
vrefbuf: vrefbuf@50025000 {
--
2.15.0