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Message-Id: <1413377405-7503-2-git-send-email-dbaryshkov@gmail.com>
Date: Wed, 15 Oct 2014 16:50:05 +0400
From: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc: Russell King <linux@....linux.org.uk>,
Thomas Gleixner <tglx@...utronix.de>,
Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: [PATCH 2/2] ARM: sa1100: use pxa_timer clocksource driver
Use pxa_timer clocksource driver.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
---
arch/arm/mach-sa1100/Makefile | 2 +-
arch/arm/mach-sa1100/generic.c | 6 ++
arch/arm/mach-sa1100/time.c | 139 -----------------------------------------
3 files changed, 7 insertions(+), 140 deletions(-)
delete mode 100644 arch/arm/mach-sa1100/time.c
diff --git a/arch/arm/mach-sa1100/Makefile b/arch/arm/mach-sa1100/Makefile
index 2732eef..8eb9a6f 100644
--- a/arch/arm/mach-sa1100/Makefile
+++ b/arch/arm/mach-sa1100/Makefile
@@ -3,7 +3,7 @@
#
# Common support
-obj-y := clock.o generic.o irq.o time.o #nmi-oopser.o
+obj-y := clock.o generic.o irq.o #nmi-oopser.o
obj-m :=
obj-n :=
obj- :=
diff --git a/arch/arm/mach-sa1100/generic.c b/arch/arm/mach-sa1100/generic.c
index d4ea142..40e0d86 100644
--- a/arch/arm/mach-sa1100/generic.c
+++ b/arch/arm/mach-sa1100/generic.c
@@ -33,6 +33,7 @@
#include <mach/irqs.h>
#include "generic.h"
+#include <clocksource/pxa.h>
unsigned int reset_status;
EXPORT_SYMBOL(reset_status);
@@ -369,6 +370,11 @@ void __init sa1100_map_io(void)
iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
}
+void __init sa1100_timer_init(void)
+{
+ pxa_timer_nodt_init(IRQ_OST0, io_p2v(0x90000000), 3686400);
+}
+
/*
* Disable the memory bus request/grant signals on the SA1110 to
* ensure that we don't receive spurious memory requests. We set
diff --git a/arch/arm/mach-sa1100/time.c b/arch/arm/mach-sa1100/time.c
deleted file mode 100644
index 1dea6cf..0000000
--- a/arch/arm/mach-sa1100/time.c
+++ /dev/null
@@ -1,139 +0,0 @@
-/*
- * linux/arch/arm/mach-sa1100/time.c
- *
- * Copyright (C) 1998 Deborah Wallach.
- * Twiddles (C) 1999 Hugo Fiennes <hugo@...eg.com>
- *
- * 2000/03/29 (C) Nicolas Pitre <nico@...xnic.net>
- * Rewritten: big cleanup, much simpler, better HZ accuracy.
- *
- */
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/timex.h>
-#include <linux/clockchips.h>
-#include <linux/sched_clock.h>
-
-#include <asm/mach/time.h>
-#include <mach/hardware.h>
-#include <mach/irqs.h>
-
-#define SA1100_CLOCK_FREQ 3686400
-#define SA1100_LATCH DIV_ROUND_CLOSEST(SA1100_CLOCK_FREQ, HZ)
-
-static u64 notrace sa1100_read_sched_clock(void)
-{
- return readl_relaxed(OSCR);
-}
-
-#define MIN_OSCR_DELTA 2
-
-static irqreturn_t sa1100_ost0_interrupt(int irq, void *dev_id)
-{
- struct clock_event_device *c = dev_id;
-
- /* Disarm the compare/match, signal the event. */
- writel_relaxed(readl_relaxed(OIER) & ~OIER_E0, OIER);
- writel_relaxed(OSSR_M0, OSSR);
- c->event_handler(c);
-
- return IRQ_HANDLED;
-}
-
-static int
-sa1100_osmr0_set_next_event(unsigned long delta, struct clock_event_device *c)
-{
- unsigned long next, oscr;
-
- writel_relaxed(readl_relaxed(OIER) | OIER_E0, OIER);
- next = readl_relaxed(OSCR) + delta;
- writel_relaxed(next, OSMR0);
- oscr = readl_relaxed(OSCR);
-
- return (signed)(next - oscr) <= MIN_OSCR_DELTA ? -ETIME : 0;
-}
-
-static void
-sa1100_osmr0_set_mode(enum clock_event_mode mode, struct clock_event_device *c)
-{
- switch (mode) {
- case CLOCK_EVT_MODE_ONESHOT:
- case CLOCK_EVT_MODE_UNUSED:
- case CLOCK_EVT_MODE_SHUTDOWN:
- writel_relaxed(readl_relaxed(OIER) & ~OIER_E0, OIER);
- writel_relaxed(OSSR_M0, OSSR);
- break;
-
- case CLOCK_EVT_MODE_RESUME:
- case CLOCK_EVT_MODE_PERIODIC:
- break;
- }
-}
-
-#ifdef CONFIG_PM
-unsigned long osmr[4], oier;
-
-static void sa1100_timer_suspend(struct clock_event_device *cedev)
-{
- osmr[0] = readl_relaxed(OSMR0);
- osmr[1] = readl_relaxed(OSMR1);
- osmr[2] = readl_relaxed(OSMR2);
- osmr[3] = readl_relaxed(OSMR3);
- oier = readl_relaxed(OIER);
-}
-
-static void sa1100_timer_resume(struct clock_event_device *cedev)
-{
- writel_relaxed(0x0f, OSSR);
- writel_relaxed(osmr[0], OSMR0);
- writel_relaxed(osmr[1], OSMR1);
- writel_relaxed(osmr[2], OSMR2);
- writel_relaxed(osmr[3], OSMR3);
- writel_relaxed(oier, OIER);
-
- /*
- * OSMR0 is the system timer: make sure OSCR is sufficiently behind
- */
- writel_relaxed(OSMR0 - SA1100_LATCH, OSCR);
-}
-#else
-#define sa1100_timer_suspend NULL
-#define sa1100_timer_resume NULL
-#endif
-
-static struct clock_event_device ckevt_sa1100_osmr0 = {
- .name = "osmr0",
- .features = CLOCK_EVT_FEAT_ONESHOT,
- .rating = 200,
- .set_next_event = sa1100_osmr0_set_next_event,
- .set_mode = sa1100_osmr0_set_mode,
- .suspend = sa1100_timer_suspend,
- .resume = sa1100_timer_resume,
-};
-
-static struct irqaction sa1100_timer_irq = {
- .name = "ost0",
- .flags = IRQF_TIMER | IRQF_IRQPOLL,
- .handler = sa1100_ost0_interrupt,
- .dev_id = &ckevt_sa1100_osmr0,
-};
-
-void __init sa1100_timer_init(void)
-{
- writel_relaxed(0, OIER);
- writel_relaxed(OSSR_M0 | OSSR_M1 | OSSR_M2 | OSSR_M3, OSSR);
-
- sched_clock_register(sa1100_read_sched_clock, 32, 3686400);
-
- ckevt_sa1100_osmr0.cpumask = cpumask_of(0);
-
- setup_irq(IRQ_OST0, &sa1100_timer_irq);
-
- clocksource_mmio_init(OSCR, "oscr", SA1100_CLOCK_FREQ, 200, 32,
- clocksource_mmio_readl_up);
- clockevents_config_and_register(&ckevt_sa1100_osmr0, 3686400,
- MIN_OSCR_DELTA * 2, 0x7fffffff);
-}
--
2.1.1
--
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