From: Guo Ren <ren_guo@c-sky.com>
To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
tglx@linutronix.de, daniel.lezcano@linaro.org,
jason@lakedaemon.net, arnd@arndb.de
Cc: c-sky_gcc_upstream@c-sky.com, gnu-csky@mentor.com,
thomas.petazzoni@bootlin.com, wbx@uclibc-ng.org,
ren_guo@c-sky.com, green.hu@gmail.com
Subject: [PATCH V3 24/26] clocksource: add C-SKY SMP timer
Date: Wed, 5 Sep 2018 20:08:03 +0800 [thread overview]
Message-ID: <68c60e0e05c5edb9147f6219bdc11d3268a5bd16.1536138304.git.ren_guo@c-sky.com> (raw)
In-Reply-To: <cover.1536138304.git.ren_guo@c-sky.com>
In-Reply-To: <cover.1536138304.git.ren_guo@c-sky.com>
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/csky_mptimer.c | 178 +++++++++++++++++++++++++++++++++++++
1 file changed, 178 insertions(+)
create mode 100644 drivers/clocksource/csky_mptimer.c
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
next prev parent reply other threads:[~2018-09-05 12:08 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-05 12:07 [PATCH V3 00/26] C-SKY(csky) Linux Kernel Port Guo Ren
2018-09-05 12:07 ` [PATCH V3 01/26] csky: Build infrastructure Guo Ren
2018-09-05 12:07 ` [PATCH V3 02/26] csky: defconfig Guo Ren
2018-09-06 13:58 ` Arnd Bergmann
2018-09-07 1:43 ` Guo Ren
2018-09-05 12:07 ` [PATCH V3 03/26] csky: Kernel booting Guo Ren
2018-09-05 12:07 ` [PATCH V3 04/26] csky: Exception handling Guo Ren
2018-09-05 12:07 ` [PATCH V3 05/26] csky: System Call Guo Ren
2018-09-06 14:10 ` Arnd Bergmann
2018-09-07 1:47 ` Guo Ren
2018-09-05 12:07 ` [PATCH V3 06/26] csky: Cache and TLB routines Guo Ren
2018-09-06 14:31 ` Arnd Bergmann
2018-09-07 3:04 ` Guo Ren
2018-09-07 8:14 ` Arnd Bergmann
2018-09-07 12:55 ` Guo Ren
2018-09-07 14:13 ` Arnd Bergmann
2018-09-08 2:20 ` Guo Ren
2018-09-05 12:07 ` [PATCH V3 07/26] csky: MMU and page table management Guo Ren
2018-09-05 12:07 ` [PATCH V3 08/26] csky: Process management and Signal Guo Ren
2018-09-05 12:07 ` [PATCH V3 09/26] csky: VDSO and rt_sigreturn Guo Ren
2018-09-06 14:02 ` Arnd Bergmann
2018-09-07 3:07 ` Guo Ren
2018-09-05 12:07 ` [PATCH V3 10/26] csky: IRQ handling Guo Ren
2018-09-06 13:39 ` Thomas Gleixner
2018-09-10 7:30 ` Guo Ren
2018-09-05 12:07 ` [PATCH V3 11/26] csky: Atomic operations Guo Ren
2018-09-05 12:07 ` [PATCH V3 12/26] csky: ELF and module probe Guo Ren
2018-09-05 12:07 ` [PATCH V3 13/26] csky: Library functions Guo Ren
2018-09-06 14:24 ` Arnd Bergmann
2018-09-06 15:50 ` Geert Uytterhoeven
2018-09-07 5:14 ` Guo Ren
2018-09-07 5:08 ` Guo Ren
2018-09-05 12:07 ` [PATCH V3 14/26] csky: User access Guo Ren
2018-09-05 12:07 ` [PATCH V3 15/26] csky: Debug and Ptrace GDB Guo Ren
2018-09-05 12:07 ` [PATCH V3 16/26] csky: SMP support Guo Ren
2018-09-05 12:07 ` [PATCH V3 17/26] csky: Misc headers Guo Ren
2018-09-06 14:16 ` Arnd Bergmann
2018-09-07 5:17 ` Guo Ren
2018-09-07 8:01 ` Arnd Bergmann
2018-09-07 8:08 ` Guo Ren
2018-09-05 12:07 ` [PATCH V3 18/26] dt-bindings: csky CPU Bindings Guo Ren
2018-09-06 0:37 ` Rob Herring
2018-09-06 1:49 ` Guo Ren
2018-09-05 12:07 ` [PATCH V3 19/26] dt-bindings: timer: gx6605s SOC timer Guo Ren
2018-09-06 0:47 ` Rob Herring
2018-09-06 2:02 ` Guo Ren
2018-09-07 6:41 ` Guo Ren
2018-09-05 12:07 ` [PATCH V3 20/26] dt-bindings: timer: C-SKY Multi-processor timer Guo Ren
2018-09-05 12:08 ` [PATCH V3 21/26] dt-bindings: interrupt-controller: C-SKY APB intc Guo Ren
2018-09-06 0:43 ` Rob Herring
2018-09-06 2:12 ` Guo Ren
2018-09-06 13:05 ` Arnd Bergmann
2018-09-07 5:40 ` Guo Ren
2018-09-07 15:13 ` Rob Herring
2018-09-08 2:05 ` Guo Ren
2018-09-05 12:08 ` [PATCH V3 22/26] dt-bindings: interrupt-controller: C-SKY SMP intc Guo Ren
2018-09-06 0:45 ` Rob Herring
2018-09-06 2:23 ` Guo Ren
2018-09-06 13:03 ` Arnd Bergmann
2018-09-07 6:07 ` Guo Ren
2018-09-05 12:08 ` [PATCH V3 23/26] clocksource: add gx6605s SOC system timer Guo Ren
2018-09-05 12:08 ` Guo Ren [this message]
2018-09-05 12:08 ` [PATCH V3 25/26] clocksource: add C-SKY timers' build infrastructure Guo Ren
2018-09-05 12:08 ` [PATCH V3 26/26] irqchip: add C-SKY irqchip drivers Guo Ren
2018-09-06 14:35 ` [PATCH V3 00/26] C-SKY(csky) Linux Kernel Port Arnd Bergmann
2018-09-07 2:08 ` Guenter Roeck
2018-09-07 6:40 ` Guo Ren
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