[PATCH V5 1/2] clocksource: add C-SKY SMP timer

[PATCH V5 1/2] clocksource: add C-SKY SMP timer

[Guo Ren]

This timer is used by SMP system and use mfcr/mtcr instruction
to access the regs.

Changelog:
 - Support csky mp timer alpha version.
 - Just use low-counter with 32bit width as clocksource.
 - Coding convention with upstream feed-back.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
 drivers/clocksource/Kconfig        |   8 ++
 drivers/clocksource/Makefile       |   1 +
 drivers/clocksource/csky_mptimer.c | 178 +++++++++++++++++++++++++++++++++++++
 3 files changed, 187 insertions(+)
 create mode 100644 drivers/clocksource/csky_mptimer.c

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index a11f4ba..51286be 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -609,6 +609,14 @@ config ATCPIT100_TIMER
 	help
 	  This option enables support for the Andestech ATCPIT100 timers.
 
+config CSKY_MPTIMER
+	bool "C-SKY Multi Processor Timer"
+	depends on CSKY
+	select TIMER_OF
+	help
+	  Say yes here to enable C-SKY SMP timer driver used for C-SKY SMP
+	  system.
+
 config RISCV_TIMER
 	bool "Timer for the RISC-V platform"
 	depends on RISCV
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index db51b24..848c676 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -79,3 +79,4 @@ obj-$(CONFIG_CLKSRC_ST_LPC)		+= clksrc_st_lpc.o
 obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o
 obj-$(CONFIG_ATCPIT100_TIMER)		+= timer-atcpit100.o
 obj-$(CONFIG_RISCV_TIMER)		+= riscv_timer.o
+obj-$(CONFIG_CSKY_MPTIMER)		+= csky_mptimer.o
diff --git a/drivers/clocksource/csky_mptimer.c b/drivers/clocksource/csky_mptimer.c
new file mode 100644
index 0000000..da2b239
--- /dev/null
+++ b/drivers/clocksource/csky_mptimer.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/sched_clock.h>
+#include <linux/cpu.h>
+#include <asm/reg_ops.h>
+
+#include "timer-of.h"
+
+#define PTIM_CCVR	"cr<3, 14>"
+#define PTIM_CTLR	"cr<0, 14>"
+#define PTIM_LVR	"cr<6, 14>"
+#define PTIM_TSR	"cr<1, 14>"
+
+static int csky_mptimer_set_next_event(unsigned long delta, struct clock_event_device *ce)
+{
+	mtcr(PTIM_LVR, delta);
+
+	return 0;
+}
+
+static int csky_mptimer_shutdown(struct clock_event_device *ce)
+{
+	mtcr(PTIM_CTLR, 0);
+
+	return 0;
+}
+
+static int csky_mptimer_oneshot(struct clock_event_device *ce)
+{
+	mtcr(PTIM_CTLR, 1);
+
+	return 0;
+}
+
+static int csky_mptimer_oneshot_stopped(struct clock_event_device *ce)
+{
+	mtcr(PTIM_CTLR, 0);
+
+	return 0;
+}
+
+static DEFINE_PER_CPU(struct timer_of, csky_to) = {
+	.flags					= TIMER_OF_CLOCK,
+	.clkevt = {
+		.rating				= 300,
+		.features			= CLOCK_EVT_FEAT_PERCPU |
+						  CLOCK_EVT_FEAT_ONESHOT,
+		.set_state_shutdown		= csky_mptimer_shutdown,
+		.set_state_oneshot		= csky_mptimer_oneshot,
+		.set_state_oneshot_stopped	= csky_mptimer_oneshot_stopped,
+		.set_next_event			= csky_mptimer_set_next_event,
+	},
+	.of_irq = {
+		.flags				= IRQF_TIMER,
+		.percpu				= 1,
+	},
+};
+
+static irqreturn_t timer_interrupt(int irq, void *dev)
+{
+	struct timer_of *to = this_cpu_ptr(&csky_to);
+
+	mtcr(PTIM_TSR, 0);
+
+	to->clkevt.event_handler(&to->clkevt);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * clock event for percpu
+ */
+static int csky_mptimer_starting_cpu(unsigned int cpu)
+{
+	struct timer_of *to = per_cpu_ptr(&csky_to, cpu);
+
+	to->clkevt.cpumask = cpumask_of(cpu);
+
+	clockevents_config_and_register(&to->clkevt, timer_of_rate(to), 2, ULONG_MAX);
+
+	enable_percpu_irq(timer_of_irq(to), 0);
+
+	return 0;
+}
+
+static int csky_mptimer_dying_cpu(unsigned int cpu)
+{
+	struct timer_of *to = per_cpu_ptr(&csky_to, cpu);
+
+	disable_percpu_irq(timer_of_irq(to));
+
+	return 0;
+}
+
+/*
+ * clock source
+ */
+static u64 sched_clock_read(void)
+{
+	return (u64) mfcr(PTIM_CCVR);
+}
+
+static u64 clksrc_read(struct clocksource *c)
+{
+	return (u64) mfcr(PTIM_CCVR);
+}
+
+struct clocksource csky_clocksource = {
+	.name	= "csky",
+	.rating	= 400,
+	.mask	= CLOCKSOURCE_MASK(32),
+	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
+	.read	= clksrc_read,
+};
+
+#define CPUHP_AP_CSKY_TIMER_STARTING CPUHP_AP_DUMMY_TIMER_STARTING
+
+static int __init csky_mptimer_init(struct device_node *np)
+{
+	int ret, cpu;
+	struct timer_of *to;
+	int rate = 0;
+	int irq	 = 0;
+
+	/*
+	 * Csky_mptimer is designed for C-SKY SMP multi-processors and
+	 * every core has it's own private irq and regs for clkevt and
+	 * clksrc.
+	 *
+	 * The regs is accessed by cpu instruction: mfcr/mtcr instead of
+	 * mmio map style. So we needn't mmio-address in dts, but we still
+	 * need to give clk and irq number.
+	 *
+	 * We use private irq for the mptimer and irq number is the same
+	 * for every core. So we use request_percpu_irq() in timer_of_init.
+	 */
+
+	for_each_possible_cpu(cpu) {
+		to = per_cpu_ptr(&csky_to, cpu);
+
+		if (cpu == 0) {
+			to->flags	  |= TIMER_OF_IRQ;
+			to->of_irq.handler = timer_interrupt;
+
+			ret = timer_of_init(np, to);
+			if (ret)
+				return ret;
+
+			rate	= timer_of_rate(to);
+			irq	= to->of_irq.irq;
+		} else {
+			ret = timer_of_init(np, to);
+			if (ret)
+				return ret;
+
+			to->of_clk.rate	= rate;
+			to->of_irq.irq	= irq;
+		}
+	}
+
+	ret = cpuhp_setup_state(CPUHP_AP_CSKY_TIMER_STARTING,
+				"clockevents/csky/timer:starting",
+				csky_mptimer_starting_cpu,
+				csky_mptimer_dying_cpu);
+	if (ret) {
+		pr_err("%s: Failed to cpuhp_setup_state.\n", __func__);
+		return ret;
+	}
+
+	clocksource_register_hz(&csky_clocksource, rate);
+	sched_clock_register(sched_clock_read, 32, rate);
+
+	return 0;
+}
+TIMER_OF_DECLARE(csky_mptimer, "csky,mptimer", csky_mptimer_init);
-- 
2.7.4

[PATCH V5 2/2] dt-bindings: timer: C-SKY Multi-processor timer

[Guo Ren]

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
 .../devicetree/bindings/timer/csky,mptimer.txt     | 46 ++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/csky,mptimer.txt

diff --git a/Documentation/devicetree/bindings/timer/csky,mptimer.txt b/Documentation/devicetree/bindings/timer/csky,mptimer.txt
new file mode 100644
index 0000000..1e7e31d
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/csky,mptimer.txt
@@ -0,0 +1,46 @@
+============================
+C-SKY Multi-processors Timer
+============================
+
+C-SKY multi-processors timer is designed for C-SKY SMP system and the
+regs is accessed by cpu co-processor 4 registers with mtcr/mfcr.
+
+ - PTIM_CTLR "cr<0, 14>" Control reg to start reset timer.
+ - PTIM_TSR  "cr<1, 14>" Interrupt cleanup status reg.
+ - PTIM_CCVR "cr<3, 14>" Current counter value reg.
+ - PTIM_LVR  "cr<6, 14>" Window value reg to triger next event.
+
+==============================
+timer node bindings definition
+==============================
+
+	Description: Describes SMP timer
+
+	PROPERTIES
+
+	- compatible
+		Usage: required
+		Value type: <string>
+		Definition: must be "csky,mptimer"
+	- clocks
+		Usage: required
+		Value type: <node>
+		Definition: must be input clk node
+	- interrupts
+		Usage: required
+		Value type: <u32>
+		Definition: must be timer irq num defined by soc
+	- interrupt-parent:
+		Usage: required
+		Value type: <node>
+		Definition: must be interrupt controller node
+
+Examples:
+---------
+
+	timer: timer {
+		compatible = "csky,mptimer";
+		clocks = <&dummy_apb_clk>;
+		interrupts = <16>;
+		interrupt-parent = <&intc>;
+	};
-- 
2.7.4

[PATCH V5 1/2] clocksource: add C-SKY SMP timer

[Guo Ren]

This timer is used by SMP system and use mfcr/mtcr instruction
to access the regs.

Changelog:
 - Support csky mp timer alpha version.
 - Just use low-counter with 32bit width as clocksource.
 - Coding convention with upstream feed-back.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
 drivers/clocksource/Kconfig        |   8 ++
 drivers/clocksource/Makefile       |   1 +
 drivers/clocksource/csky_mptimer.c | 178 +++++++++++++++++++++++++++++++++++++
 3 files changed, 187 insertions(+)
 create mode 100644 drivers/clocksource/csky_mptimer.c

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index a11f4ba..51286be 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -609,6 +609,14 @@ config ATCPIT100_TIMER
 	help
 	  This option enables support for the Andestech ATCPIT100 timers.
 
+config CSKY_MPTIMER
+	bool "C-SKY Multi Processor Timer"
+	depends on CSKY
+	select TIMER_OF
+	help
+	  Say yes here to enable C-SKY SMP timer driver used for C-SKY SMP
+	  system.
+
 config RISCV_TIMER
 	bool "Timer for the RISC-V platform"
 	depends on RISCV
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index db51b24..848c676 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -79,3 +79,4 @@ obj-$(CONFIG_CLKSRC_ST_LPC)		+= clksrc_st_lpc.o
 obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o
 obj-$(CONFIG_ATCPIT100_TIMER)		+= timer-atcpit100.o
 obj-$(CONFIG_RISCV_TIMER)		+= riscv_timer.o
+obj-$(CONFIG_CSKY_MPTIMER)		+= csky_mptimer.o
diff --git a/drivers/clocksource/csky_mptimer.c b/drivers/clocksource/csky_mptimer.c
new file mode 100644
index 0000000..da2b239
--- /dev/null
+++ b/drivers/clocksource/csky_mptimer.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/sched_clock.h>
+#include <linux/cpu.h>
+#include <asm/reg_ops.h>
+
+#include "timer-of.h"
+
+#define PTIM_CCVR	"cr<3, 14>"
+#define PTIM_CTLR	"cr<0, 14>"
+#define PTIM_LVR	"cr<6, 14>"
+#define PTIM_TSR	"cr<1, 14>"
+
+static int csky_mptimer_set_next_event(unsigned long delta, struct clock_event_device *ce)
+{
+	mtcr(PTIM_LVR, delta);
+
+	return 0;
+}
+
+static int csky_mptimer_shutdown(struct clock_event_device *ce)
+{
+	mtcr(PTIM_CTLR, 0);
+
+	return 0;
+}
+
+static int csky_mptimer_oneshot(struct clock_event_device *ce)
+{
+	mtcr(PTIM_CTLR, 1);
+
+	return 0;
+}
+
+static int csky_mptimer_oneshot_stopped(struct clock_event_device *ce)
+{
+	mtcr(PTIM_CTLR, 0);
+
+	return 0;
+}
+
+static DEFINE_PER_CPU(struct timer_of, csky_to) = {
+	.flags					= TIMER_OF_CLOCK,
+	.clkevt = {
+		.rating				= 300,
+		.features			= CLOCK_EVT_FEAT_PERCPU |
+						  CLOCK_EVT_FEAT_ONESHOT,
+		.set_state_shutdown		= csky_mptimer_shutdown,
+		.set_state_oneshot		= csky_mptimer_oneshot,
+		.set_state_oneshot_stopped	= csky_mptimer_oneshot_stopped,
+		.set_next_event			= csky_mptimer_set_next_event,
+	},
+	.of_irq = {
+		.flags				= IRQF_TIMER,
+		.percpu				= 1,
+	},
+};
+
+static irqreturn_t timer_interrupt(int irq, void *dev)
+{
+	struct timer_of *to = this_cpu_ptr(&csky_to);
+
+	mtcr(PTIM_TSR, 0);
+
+	to->clkevt.event_handler(&to->clkevt);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * clock event for percpu
+ */
+static int csky_mptimer_starting_cpu(unsigned int cpu)
+{
+	struct timer_of *to = per_cpu_ptr(&csky_to, cpu);
+
+	to->clkevt.cpumask = cpumask_of(cpu);
+
+	clockevents_config_and_register(&to->clkevt, timer_of_rate(to), 2, ULONG_MAX);
+
+	enable_percpu_irq(timer_of_irq(to), 0);
+
+	return 0;
+}
+
+static int csky_mptimer_dying_cpu(unsigned int cpu)
+{
+	struct timer_of *to = per_cpu_ptr(&csky_to, cpu);
+
+	disable_percpu_irq(timer_of_irq(to));
+
+	return 0;
+}
+
+/*
+ * clock source
+ */
+static u64 sched_clock_read(void)
+{
+	return (u64) mfcr(PTIM_CCVR);
+}
+
+static u64 clksrc_read(struct clocksource *c)
+{
+	return (u64) mfcr(PTIM_CCVR);
+}
+
+struct clocksource csky_clocksource = {
+	.name	= "csky",
+	.rating	= 400,
+	.mask	= CLOCKSOURCE_MASK(32),
+	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
+	.read	= clksrc_read,
+};
+
+#define CPUHP_AP_CSKY_TIMER_STARTING CPUHP_AP_DUMMY_TIMER_STARTING
+
+static int __init csky_mptimer_init(struct device_node *np)
+{
+	int ret, cpu;
+	struct timer_of *to;
+	int rate = 0;
+	int irq	 = 0;
+
+	/*
+	 * Csky_mptimer is designed for C-SKY SMP multi-processors and
+	 * every core has it's own private irq and regs for clkevt and
+	 * clksrc.
+	 *
+	 * The regs is accessed by cpu instruction: mfcr/mtcr instead of
+	 * mmio map style. So we needn't mmio-address in dts, but we still
+	 * need to give clk and irq number.
+	 *
+	 * We use private irq for the mptimer and irq number is the same
+	 * for every core. So we use request_percpu_irq() in timer_of_init.
+	 */
+
+	for_each_possible_cpu(cpu) {
+		to = per_cpu_ptr(&csky_to, cpu);
+
+		if (cpu == 0) {
+			to->flags	  |= TIMER_OF_IRQ;
+			to->of_irq.handler = timer_interrupt;
+
+			ret = timer_of_init(np, to);
+			if (ret)
+				return ret;
+
+			rate	= timer_of_rate(to);
+			irq	= to->of_irq.irq;
+		} else {
+			ret = timer_of_init(np, to);
+			if (ret)
+				return ret;
+
+			to->of_clk.rate	= rate;
+			to->of_irq.irq	= irq;
+		}
+	}
+
+	ret = cpuhp_setup_state(CPUHP_AP_CSKY_TIMER_STARTING,
+				"clockevents/csky/timer:starting",
+				csky_mptimer_starting_cpu,
+				csky_mptimer_dying_cpu);
+	if (ret) {
+		pr_err("%s: Failed to cpuhp_setup_state.\n", __func__);
+		return ret;
+	}
+
+	clocksource_register_hz(&csky_clocksource, rate);
+	sched_clock_register(sched_clock_read, 32, rate);
+
+	return 0;
+}
+TIMER_OF_DECLARE(csky_mptimer, "csky,mptimer", csky_mptimer_init);
-- 
2.7.4

[PATCH V5 1/2] clocksource: add gx6605s SOC system timer

[Guo Ren]

Changelog:
 - Add License and Copyright
 - Use timer-of framework
 - Change name with upstream feedback
 - Use clksource_mmio framework

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
 drivers/clocksource/Kconfig         |   8 ++
 drivers/clocksource/Makefile        |   1 +
 drivers/clocksource/timer-gx6605s.c | 150 ++++++++++++++++++++++++++++++++++++
 3 files changed, 159 insertions(+)
 create mode 100644 drivers/clocksource/timer-gx6605s.c

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index a11f4ba..6d0f18d 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -620,4 +620,12 @@ config RISCV_TIMER
 	  is accessed via both the SBI and the rdcycle instruction.  This is
 	  required for all RISC-V systems.
 
+config GX6605S_TIMER
+	bool "Gx6605s SOC system timer driver"
+	depends on CSKY
+	select CLKSRC_MMIO
+	select TIMER_OF
+	help
+	  This option enables support for gx6605s SOC's timer.
+
 endmenu
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index db51b24..dc5621d 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -79,3 +79,4 @@ obj-$(CONFIG_CLKSRC_ST_LPC)		+= clksrc_st_lpc.o
 obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o
 obj-$(CONFIG_ATCPIT100_TIMER)		+= timer-atcpit100.o
 obj-$(CONFIG_RISCV_TIMER)		+= riscv_timer.o
+obj-$(CONFIG_GX6605S_TIMER)		+= timer-gx6605s.o
diff --git a/drivers/clocksource/timer-gx6605s.c b/drivers/clocksource/timer-gx6605s.c
new file mode 100644
index 0000000..10194c9
--- /dev/null
+++ b/drivers/clocksource/timer-gx6605s.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/sched_clock.h>
+
+#include "timer-of.h"
+
+#define CLKSRC_OFFSET	0x40
+
+#define TIMER_STATUS	0x00
+#define TIMER_VALUE	0x04
+#define TIMER_CONTRL	0x10
+#define TIMER_CONFIG	0x20
+#define TIMER_DIV	0x24
+#define TIMER_INI	0x28
+
+#define GX6605S_STATUS_CLR	BIT(0)
+#define GX6605S_CONTRL_RST	BIT(0)
+#define GX6605S_CONTRL_START	BIT(1)
+#define GX6605S_CONFIG_EN	BIT(0)
+#define GX6605S_CONFIG_IRQ_EN	BIT(1)
+
+static irqreturn_t gx6605s_timer_interrupt(int irq, void *dev)
+{
+	struct clock_event_device *ce = (struct clock_event_device *) dev;
+	void __iomem *base = timer_of_base(to_timer_of(ce));
+
+	writel_relaxed(GX6605S_STATUS_CLR, base + TIMER_STATUS);
+
+	ce->event_handler(ce);
+
+	return IRQ_HANDLED;
+}
+
+static int gx6605s_timer_set_oneshot(struct clock_event_device *ce)
+{
+	void __iomem *base = timer_of_base(to_timer_of(ce));
+
+	/* reset and stop counter */
+	writel_relaxed(GX6605S_CONTRL_RST, base + TIMER_CONTRL);
+
+	/* enable with irq and start */
+	writel_relaxed(GX6605S_CONFIG_EN | GX6605S_CONFIG_IRQ_EN, base + TIMER_CONFIG);
+
+	return 0;
+}
+
+static int gx6605s_timer_set_next_event(unsigned long delta, struct clock_event_device *ce)
+{
+	void __iomem *base = timer_of_base(to_timer_of(ce));
+
+	/* use reset to pause timer */
+	writel_relaxed(GX6605S_CONTRL_RST, base + TIMER_CONTRL);
+
+	/* config next timeout value */
+	writel_relaxed(ULONG_MAX - delta, base + TIMER_INI);
+	writel_relaxed(GX6605S_CONTRL_START, base + TIMER_CONTRL);
+
+	return 0;
+}
+
+static int gx6605s_timer_shutdown(struct clock_event_device *ce)
+{
+	void __iomem *base = timer_of_base(to_timer_of(ce));
+
+	writel_relaxed(0, base + TIMER_CONTRL);
+	writel_relaxed(0, base + TIMER_CONFIG);
+
+	return 0;
+}
+
+static struct timer_of to = {
+	.flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
+	.clkevt = {
+		.rating			= 300,
+		.features		= CLOCK_EVT_FEAT_DYNIRQ |
+					  CLOCK_EVT_FEAT_ONESHOT,
+		.set_state_shutdown	= gx6605s_timer_shutdown,
+		.set_state_oneshot	= gx6605s_timer_set_oneshot,
+		.set_next_event		= gx6605s_timer_set_next_event,
+		.cpumask		= cpu_possible_mask,
+	},
+	.of_irq = {
+		.handler		= gx6605s_timer_interrupt,
+		.flags			= IRQF_TIMER | IRQF_IRQPOLL,
+	},
+};
+
+static u64 notrace gx6605s_sched_clock_read(void)
+{
+	void __iomem *base;
+
+	base = timer_of_base(&to) + CLKSRC_OFFSET;
+
+	return (u64) readl_relaxed(base + TIMER_VALUE);
+}
+
+static void gx6605s_clkevt_init(void __iomem *base)
+{
+	writel_relaxed(0, base + TIMER_DIV);
+	writel_relaxed(0, base + TIMER_CONFIG);
+
+	clockevents_config_and_register(&to.clkevt, timer_of_rate(&to), 2, ULONG_MAX);
+}
+
+static int gx6605s_clksrc_init(void __iomem *base)
+{
+	writel_relaxed(0, base + TIMER_DIV);
+	writel_relaxed(0, base + TIMER_INI);
+
+	writel_relaxed(GX6605S_CONTRL_RST, base + TIMER_CONTRL);
+
+	writel_relaxed(GX6605S_CONFIG_EN, base + TIMER_CONFIG);
+
+	writel_relaxed(GX6605S_CONTRL_START, base + TIMER_CONTRL);
+
+	sched_clock_register(gx6605s_sched_clock_read, 32, timer_of_rate(&to));
+
+	return clocksource_mmio_init(base + TIMER_VALUE, "gx6605s", timer_of_rate(&to),
+				     200, 32, clocksource_mmio_readl_up);
+}
+
+static int __init gx6605s_timer_init(struct device_node *np)
+{
+	int ret;
+
+	/*
+	 * The timer driver is for nationalchip gx6605s SOC and there are two same timer
+	 * in gx6605s. We use one for clkevt and another for clksrc.
+	 *
+	 * The timer is mmio map to access, so we need give mmio addres in dts.
+	 *
+	 * It provides a 32bit countup timer and interrupt will be caused by count-overflow.
+	 * So we need set-next-event by ULONG_MAX - delta in TIMER_INI reg.
+	 *
+	 * The counter at 0x0  offset is clock event.
+	 * The counter at 0x40 offset is clock source.
+	 * They are the same in hardware, just different used by driver.
+	 */
+	ret = timer_of_init(np, &to);
+	if (ret)
+		return ret;
+
+	gx6605s_clkevt_init(timer_of_base(&to));
+
+	return gx6605s_clksrc_init(timer_of_base(&to) + CLKSRC_OFFSET);
+}
+TIMER_OF_DECLARE(csky_gx6605s_timer, "csky,gx6605s-timer", gx6605s_timer_init);
-- 
2.7.4

[PATCH V5 2/2] dt-bindings: timer: C-SKY Multi-processor timer

[Guo Ren]

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
 .../devicetree/bindings/timer/csky,mptimer.txt     | 46 ++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/csky,mptimer.txt

diff --git a/Documentation/devicetree/bindings/timer/csky,mptimer.txt b/Documentation/devicetree/bindings/timer/csky,mptimer.txt
new file mode 100644
index 0000000..1e7e31d
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/csky,mptimer.txt
@@ -0,0 +1,46 @@
+============================
+C-SKY Multi-processors Timer
+============================
+
+C-SKY multi-processors timer is designed for C-SKY SMP system and the
+regs is accessed by cpu co-processor 4 registers with mtcr/mfcr.
+
+ - PTIM_CTLR "cr<0, 14>" Control reg to start reset timer.
+ - PTIM_TSR  "cr<1, 14>" Interrupt cleanup status reg.
+ - PTIM_CCVR "cr<3, 14>" Current counter value reg.
+ - PTIM_LVR  "cr<6, 14>" Window value reg to triger next event.
+
+==============================
+timer node bindings definition
+==============================
+
+	Description: Describes SMP timer
+
+	PROPERTIES
+
+	- compatible
+		Usage: required
+		Value type: <string>
+		Definition: must be "csky,mptimer"
+	- clocks
+		Usage: required
+		Value type: <node>
+		Definition: must be input clk node
+	- interrupts
+		Usage: required
+		Value type: <u32>
+		Definition: must be timer irq num defined by soc
+	- interrupt-parent:
+		Usage: required
+		Value type: <node>
+		Definition: must be interrupt controller node
+
+Examples:
+---------
+
+	timer: timer {
+		compatible = "csky,mptimer";
+		clocks = <&dummy_apb_clk>;
+		interrupts = <16>;
+		interrupt-parent = <&intc>;
+	};
-- 
2.7.4

[PATCH V5 2/2] dt-bindings: timer: gx6605s SOC timer

[Guo Ren]

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
 .../bindings/timer/csky,gx6605s-timer.txt          | 42 ++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt

diff --git a/Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt b/Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt
new file mode 100644
index 0000000..6b04344
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt
@@ -0,0 +1,42 @@
+=================
+gx6605s SOC Timer
+=================
+
+The timer is used in gx6605s soc as system timer and the driver
+contain clk event and clk source.
+
+==============================
+timer node bindings definition
+==============================
+
+	Description: Describes gx6605s SOC timer
+
+	PROPERTIES
+
+	- compatible
+		Usage: required
+		Value type: <string>
+		Definition: must be "csky,gx6605s-timer"
+	- reg
+		Usage: required
+		Value type: <u32 u32>
+		Definition: <phyaddr size> in soc from cpu view
+	- clocks
+		Usage: required
+		Value type: phandle + clock specifier cells
+		Definition: must be input clk node
+	- interrupt
+		Usage: required
+		Value type: <u32>
+		Definition: must be timer irq num defined by soc
+
+Examples:
+---------
+
+	timer0: timer@20a000 {
+		compatible = "csky,gx6605s-timer";
+		reg = <0x0020a000 0x400>;
+		clocks = <&dummy_apb_clk>;
+		interrupts = <10>;
+		interrupt-parent = <&intc>;
+	};
-- 
2.7.4

Re: [PATCH V5 1/2] clocksource: add C-SKY SMP timer

[Guo Ren]

Sorry for duplicate patch-sets, for gx6605s-timer See PATCH V6.

On Sun, Sep 16, 2018 at 05:13:57PM +0800, Guo Ren wrote:
> This timer is used by SMP system and use mfcr/mtcr instruction
> to access the regs.
> 
> Changelog:
>  - Support csky mp timer alpha version.
>  - Just use low-counter with 32bit width as clocksource.
>  - Coding convention with upstream feed-back.
> 
> Signed-off-by: Guo Ren <ren_guo@c-sky.com>
> ---
>  drivers/clocksource/Kconfig        |   8 ++
>  drivers/clocksource/Makefile       |   1 +
>  drivers/clocksource/csky_mptimer.c | 178 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 187 insertions(+)
>  create mode 100644 drivers/clocksource/csky_mptimer.c
> 
> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
> index a11f4ba..51286be 100644
> --- a/drivers/clocksource/Kconfig
> +++ b/drivers/clocksource/Kconfig
> @@ -609,6 +609,14 @@ config ATCPIT100_TIMER
>  	help
>  	  This option enables support for the Andestech ATCPIT100 timers.
>  
> +config CSKY_MPTIMER
> +	bool "C-SKY Multi Processor Timer"
> +	depends on CSKY
> +	select TIMER_OF
> +	help
> +	  Say yes here to enable C-SKY SMP timer driver used for C-SKY SMP
> +	  system.
> +
>  config RISCV_TIMER
>  	bool "Timer for the RISC-V platform"
>  	depends on RISCV
> diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
> index db51b24..848c676 100644
> --- a/drivers/clocksource/Makefile
> +++ b/drivers/clocksource/Makefile
> @@ -79,3 +79,4 @@ obj-$(CONFIG_CLKSRC_ST_LPC)		+= clksrc_st_lpc.o
>  obj-$(CONFIG_X86_NUMACHIP)		+= numachip.o
>  obj-$(CONFIG_ATCPIT100_TIMER)		+= timer-atcpit100.o
>  obj-$(CONFIG_RISCV_TIMER)		+= riscv_timer.o
> +obj-$(CONFIG_CSKY_MPTIMER)		+= csky_mptimer.o
> diff --git a/drivers/clocksource/csky_mptimer.c b/drivers/clocksource/csky_mptimer.c
> new file mode 100644
> index 0000000..da2b239
> --- /dev/null
> +++ b/drivers/clocksource/csky_mptimer.c
> @@ -0,0 +1,178 @@
> +// SPDX-License-Identifier: GPL-2.0
> +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
> +
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/sched_clock.h>
> +#include <linux/cpu.h>
> +#include <asm/reg_ops.h>
> +
> +#include "timer-of.h"
> +
> +#define PTIM_CCVR	"cr<3, 14>"
> +#define PTIM_CTLR	"cr<0, 14>"
> +#define PTIM_LVR	"cr<6, 14>"
> +#define PTIM_TSR	"cr<1, 14>"
> +
> +static int csky_mptimer_set_next_event(unsigned long delta, struct clock_event_device *ce)
> +{
> +	mtcr(PTIM_LVR, delta);
> +
> +	return 0;
> +}
> +
> +static int csky_mptimer_shutdown(struct clock_event_device *ce)
> +{
> +	mtcr(PTIM_CTLR, 0);
> +
> +	return 0;
> +}
> +
> +static int csky_mptimer_oneshot(struct clock_event_device *ce)
> +{
> +	mtcr(PTIM_CTLR, 1);
> +
> +	return 0;
> +}
> +
> +static int csky_mptimer_oneshot_stopped(struct clock_event_device *ce)
> +{
> +	mtcr(PTIM_CTLR, 0);
> +
> +	return 0;
> +}
> +
> +static DEFINE_PER_CPU(struct timer_of, csky_to) = {
> +	.flags					= TIMER_OF_CLOCK,
> +	.clkevt = {
> +		.rating				= 300,
> +		.features			= CLOCK_EVT_FEAT_PERCPU |
> +						  CLOCK_EVT_FEAT_ONESHOT,
> +		.set_state_shutdown		= csky_mptimer_shutdown,
> +		.set_state_oneshot		= csky_mptimer_oneshot,
> +		.set_state_oneshot_stopped	= csky_mptimer_oneshot_stopped,
> +		.set_next_event			= csky_mptimer_set_next_event,
> +	},
> +	.of_irq = {
> +		.flags				= IRQF_TIMER,
> +		.percpu				= 1,
> +	},
> +};
> +
> +static irqreturn_t timer_interrupt(int irq, void *dev)
> +{
> +	struct timer_of *to = this_cpu_ptr(&csky_to);
> +
> +	mtcr(PTIM_TSR, 0);
> +
> +	to->clkevt.event_handler(&to->clkevt);
> +
> +	return IRQ_HANDLED;
> +}
> +
> +/*
> + * clock event for percpu
> + */
> +static int csky_mptimer_starting_cpu(unsigned int cpu)
> +{
> +	struct timer_of *to = per_cpu_ptr(&csky_to, cpu);
> +
> +	to->clkevt.cpumask = cpumask_of(cpu);
> +
> +	clockevents_config_and_register(&to->clkevt, timer_of_rate(to), 2, ULONG_MAX);
> +
> +	enable_percpu_irq(timer_of_irq(to), 0);
> +
> +	return 0;
> +}
> +
> +static int csky_mptimer_dying_cpu(unsigned int cpu)
> +{
> +	struct timer_of *to = per_cpu_ptr(&csky_to, cpu);
> +
> +	disable_percpu_irq(timer_of_irq(to));
> +
> +	return 0;
> +}
> +
> +/*
> + * clock source
> + */
> +static u64 sched_clock_read(void)
> +{
> +	return (u64) mfcr(PTIM_CCVR);
> +}
> +
> +static u64 clksrc_read(struct clocksource *c)
> +{
> +	return (u64) mfcr(PTIM_CCVR);
> +}
> +
> +struct clocksource csky_clocksource = {
> +	.name	= "csky",
> +	.rating	= 400,
> +	.mask	= CLOCKSOURCE_MASK(32),
> +	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
> +	.read	= clksrc_read,
> +};
> +
> +#define CPUHP_AP_CSKY_TIMER_STARTING CPUHP_AP_DUMMY_TIMER_STARTING
> +
> +static int __init csky_mptimer_init(struct device_node *np)
> +{
> +	int ret, cpu;
> +	struct timer_of *to;
> +	int rate = 0;
> +	int irq	 = 0;
> +
> +	/*
> +	 * Csky_mptimer is designed for C-SKY SMP multi-processors and
> +	 * every core has it's own private irq and regs for clkevt and
> +	 * clksrc.
> +	 *
> +	 * The regs is accessed by cpu instruction: mfcr/mtcr instead of
> +	 * mmio map style. So we needn't mmio-address in dts, but we still
> +	 * need to give clk and irq number.
> +	 *
> +	 * We use private irq for the mptimer and irq number is the same
> +	 * for every core. So we use request_percpu_irq() in timer_of_init.
> +	 */
> +
> +	for_each_possible_cpu(cpu) {
> +		to = per_cpu_ptr(&csky_to, cpu);
> +
> +		if (cpu == 0) {
> +			to->flags	  |= TIMER_OF_IRQ;
> +			to->of_irq.handler = timer_interrupt;
> +
> +			ret = timer_of_init(np, to);
> +			if (ret)
> +				return ret;
> +
> +			rate	= timer_of_rate(to);
> +			irq	= to->of_irq.irq;
> +		} else {
> +			ret = timer_of_init(np, to);
> +			if (ret)
> +				return ret;
> +
> +			to->of_clk.rate	= rate;
> +			to->of_irq.irq	= irq;
> +		}
> +	}
> +
> +	ret = cpuhp_setup_state(CPUHP_AP_CSKY_TIMER_STARTING,
> +				"clockevents/csky/timer:starting",
> +				csky_mptimer_starting_cpu,
> +				csky_mptimer_dying_cpu);
> +	if (ret) {
> +		pr_err("%s: Failed to cpuhp_setup_state.\n", __func__);
> +		return ret;
> +	}
> +
> +	clocksource_register_hz(&csky_clocksource, rate);
> +	sched_clock_register(sched_clock_read, 32, rate);
> +
> +	return 0;
> +}
> +TIMER_OF_DECLARE(csky_mptimer, "csky,mptimer", csky_mptimer_init);
> -- 
> 2.7.4