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Subject[PATCH V2 18/19] clocksource: add C-SKY clocksource drivers
Date
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
---
drivers/clocksource/Makefile | 1 +
drivers/clocksource/timer-csky-v1.c | 169 +++++++++++++++++++++++++++++++
drivers/clocksource/timer-nationalchip.c | 165 ++++++++++++++++++++++++++++++
3 files changed, 335 insertions(+)
create mode 100644 drivers/clocksource/timer-csky-v1.c
create mode 100644 drivers/clocksource/timer-nationalchip.c

diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index d6dec44..bbc567b 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -76,3 +76,4 @@ obj-$(CONFIG_H8300_TMR16) += h8300_timer16.o
obj-$(CONFIG_H8300_TPU) += h8300_tpu.o
obj-$(CONFIG_CLKSRC_ST_LPC) += clksrc_st_lpc.o
obj-$(CONFIG_X86_NUMACHIP) += numachip.o
+obj-$(CONFIG_CSKY) += timer-csky-v1.o timer-nationalchip.o
diff --git a/drivers/clocksource/timer-csky-v1.c b/drivers/clocksource/timer-csky-v1.c
new file mode 100644
index 0000000..f3a822a
--- /dev/null
+++ b/drivers/clocksource/timer-csky-v1.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou NationalChip Science & Technology 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_CTLR "cr<0, 14>"
+#define PTIM_TSR "cr<1, 14>"
+#define PTIM_CCVR_HI "cr<2, 14>"
+#define PTIM_CCVR_LO "cr<3, 14>"
+#define PTIM_LVR "cr<6, 14>"
+
+#define BITS_CSKY_TIMER 56
+
+DECLARE_PER_CPU(struct timer_of, csky_to);
+
+static int csky_timer_irq;
+static int csky_timer_rate;
+
+static inline u64 get_ccvr(void)
+{
+ u32 lo, hi, t;
+
+ do {
+ hi = mfcr(PTIM_CCVR_HI);
+ lo = mfcr(PTIM_CCVR_LO);
+ t = mfcr(PTIM_CCVR_HI);
+ } while(t != hi);
+
+ return ((u64)hi << 32) | lo;
+}
+
+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;
+}
+
+static int csky_timer_set_next_event(unsigned long delta, struct clock_event_device *ce)
+{
+ mtcr(PTIM_LVR, delta);
+
+ return 0;
+}
+
+static int csky_timer_shutdown(struct clock_event_device *ce)
+{
+ mtcr(PTIM_CTLR, 0);
+
+ return 0;
+}
+
+static int csky_timer_oneshot(struct clock_event_device *ce)
+{
+ mtcr(PTIM_CTLR, 1);
+
+ return 0;
+}
+
+static int csky_timer_oneshot_stopped(struct clock_event_device *ce)
+{
+ mtcr(PTIM_CTLR, 0);
+
+ return 0;
+}
+
+DEFINE_PER_CPU(struct timer_of, csky_to) = {
+ .flags = TIMER_OF_CLOCK | TIMER_OF_IRQ,
+
+ .clkevt = {
+ .name = "C-SKY SMP Timer V1",
+ .rating = 300,
+ .features = CLOCK_EVT_FEAT_PERCPU | CLOCK_EVT_FEAT_ONESHOT,
+ .set_state_shutdown = csky_timer_shutdown,
+ .set_state_oneshot = csky_timer_oneshot,
+ .set_state_oneshot_stopped = csky_timer_oneshot_stopped,
+ .set_next_event = csky_timer_set_next_event,
+ },
+
+ .of_irq = {
+ .handler = timer_interrupt,
+ .flags = IRQF_TIMER,
+ .percpu = 1,
+ },
+};
+
+/*** clock event for percpu ***/
+static int csky_timer_starting_cpu(unsigned int cpu)
+{
+ struct timer_of *to = this_cpu_ptr(&csky_to);
+
+ to->clkevt.cpumask = cpumask_of(smp_processor_id());
+
+ clockevents_config_and_register(&to->clkevt, csky_timer_rate, 0, ULONG_MAX);
+
+ enable_percpu_irq(csky_timer_irq, 0);
+
+ return 0;
+}
+
+static int csky_timer_dying_cpu(unsigned int cpu)
+{
+ disable_percpu_irq(csky_timer_irq);
+
+ return 0;
+}
+
+/*** clock source ***/
+static u64 sched_clock_read(void)
+{
+ return get_ccvr();
+}
+
+static u64 clksrc_read(struct clocksource *c)
+{
+ return get_ccvr();
+}
+
+struct clocksource csky_clocksource = {
+ .name = "csky_timer_v1_clksrc",
+ .rating = 400,
+ .mask = CLOCKSOURCE_MASK(BITS_CSKY_TIMER),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+ .read = clksrc_read,
+};
+
+static void csky_clksrc_init(void)
+{
+ clocksource_register_hz(&csky_clocksource, csky_timer_rate);
+
+ sched_clock_register(sched_clock_read, BITS_CSKY_TIMER, csky_timer_rate);
+}
+
+static int __init csky_timer_v1_init(struct device_node *np)
+{
+ int ret;
+ struct timer_of *to = this_cpu_ptr(&csky_to);
+
+ ret = timer_of_init(np, to);
+ if (ret)
+ return ret;
+
+ csky_timer_irq = to->of_irq.irq;
+ csky_timer_rate = timer_of_rate(to);
+
+ ret = cpuhp_setup_state(CPUHP_AP_DUMMY_TIMER_STARTING,
+ "clockevents/csky/timer:starting",
+ csky_timer_starting_cpu,
+ csky_timer_dying_cpu);
+ if (ret) {
+ pr_err("%s: Failed to cpuhp_setup_state.\n", __func__);
+ return ret;
+ }
+
+ csky_clksrc_init();
+
+ return ret;
+}
+TIMER_OF_DECLARE(csky_timer_v1, "csky,timer-v1", csky_timer_v1_init);
+
diff --git a/drivers/clocksource/timer-nationalchip.c b/drivers/clocksource/timer-nationalchip.c
new file mode 100644
index 0000000..8f4e1e5
--- /dev/null
+++ b/drivers/clocksource/timer-nationalchip.c
@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou NationalChip Science & Technology Co.,Ltd.
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/sched_clock.h>
+
+#include "timer-of.h"
+
+#define TIMER_NAME "nc_timer"
+#define TIMER_FREQ 1000000
+#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 STATUS_clr BIT(0)
+
+#define CONTRL_rst BIT(0)
+#define CONTRL_start BIT(1)
+
+#define CONFIG_en BIT(0)
+#define CONFIG_irq_en BIT(1)
+
+static irqreturn_t 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(STATUS_clr, base + TIMER_STATUS);
+
+ ce->event_handler(ce);
+
+ return IRQ_HANDLED;
+}
+
+static int nc_timer_set_periodic(struct clock_event_device *ce)
+{
+ void __iomem *base = timer_of_base(to_timer_of(ce));
+
+ /* reset */
+ writel_relaxed(CONTRL_rst, base + TIMER_CONTRL);
+
+ /* config the timeout value */
+ writel_relaxed(ULONG_MAX - timer_of_period(to_timer_of(ce)),
+ base + TIMER_INI);
+
+ /* enable with irq and start */
+ writel_relaxed(CONFIG_en|CONFIG_irq_en, base + TIMER_CONFIG);
+ writel_relaxed(CONTRL_start, base + TIMER_CONTRL);
+
+ return 0;
+}
+
+static int nc_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(CONTRL_rst, base + TIMER_CONTRL);
+
+ /* config next timeout value */
+ writel_relaxed(ULONG_MAX - delta, base + TIMER_INI);
+ writel_relaxed(CONTRL_start, base + TIMER_CONTRL);
+
+ return 0;
+}
+
+static int nc_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 = {
+ .name = TIMER_NAME,
+ .rating = 300,
+ .features = CLOCK_EVT_FEAT_DYNIRQ | CLOCK_EVT_FEAT_PERIODIC |
+ CLOCK_EVT_FEAT_ONESHOT,
+ .set_state_shutdown = nc_timer_shutdown,
+ .set_state_periodic = nc_timer_set_periodic,
+ .set_next_event = nc_timer_set_next_event,
+ .cpumask = cpu_possible_mask,
+ },
+
+ .of_irq = {
+ .handler = timer_interrupt,
+ .flags = IRQF_TIMER | IRQF_IRQPOLL,
+ },
+};
+
+static u64 notrace nc_sched_clock_read(void)
+{
+ void __iomem *base;
+
+ base = timer_of_base(&to) + CLKSRC_OFFSET;
+
+ return (u64) readl_relaxed(base + TIMER_VALUE);
+}
+
+static void nc_timer_set_div(void __iomem *base)
+{
+ unsigned int div;
+
+ div = timer_of_rate(&to)/TIMER_FREQ - 1;
+
+ writel_relaxed(div, base + TIMER_DIV);
+}
+
+static void nc_clkevt_init(void __iomem *base)
+{
+ /* reset */
+ writel_relaxed(CONTRL_rst, base + TIMER_CONTRL);
+
+ /* reset config */
+ writel_relaxed(0, base + TIMER_CONFIG);
+
+ nc_timer_set_div(base);
+
+ clockevents_config_and_register(&to.clkevt, TIMER_FREQ, 1, ULONG_MAX);
+}
+
+static void nc_clksrc_init(void __iomem *base)
+{
+ writel_relaxed(CONTRL_rst, base + TIMER_CONTRL);
+
+ writel_relaxed(CONFIG_en, base + TIMER_CONFIG);
+
+ nc_timer_set_div(base);
+
+ writel_relaxed(0, base + TIMER_INI);
+ writel_relaxed(CONTRL_start, base + TIMER_CONTRL);
+
+ clocksource_mmio_init(base + TIMER_VALUE, "nationalchip", TIMER_FREQ, 200, 32,
+ clocksource_mmio_readl_up);
+
+ sched_clock_register(nc_sched_clock_read, 32, TIMER_FREQ);
+}
+
+static int __init nc_timer_init(struct device_node *np)
+{
+ int ret;
+
+ ret = timer_of_init(np, &to);
+ if (ret)
+ return ret;
+
+ nc_clkevt_init(timer_of_base(&to));
+
+ nc_clksrc_init(timer_of_base(&to) + CLKSRC_OFFSET);
+
+ return 0;
+}
+TIMER_OF_DECLARE(nc_timer, "nationalchip,timer-v1", nc_timer_init);
+
--
2.7.4
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