[ARM] 4593/1: ns9xxx: implement generic clockevents
Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a43a814..4b984b1 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -320,6 +320,7 @@
bool "NetSilicon NS9xxx"
select GENERIC_GPIO
select GENERIC_TIME
+ select GENERIC_CLOCKEVENTS
help
Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
System.
diff --git a/arch/arm/mach-ns9xxx/time.c b/arch/arm/mach-ns9xxx/time.c
index d293455..6f29515 100644
--- a/arch/arm/mach-ns9xxx/time.c
+++ b/arch/arm/mach-ns9xxx/time.c
@@ -13,6 +13,7 @@
#include <linux/irq.h>
#include <linux/stringify.h>
#include <linux/clocksource.h>
+#include <linux/clockchips.h>
#include <asm/arch-ns9xxx/regs-sys.h>
#include <asm/arch-ns9xxx/clock.h>
@@ -20,38 +21,9 @@
#include <asm/arch/system.h>
#include "generic.h"
-#define TIMERCLOCKSELECT 64
-#define TIMER_CLOCKSOURCE 1
-
-static irqreturn_t
-ns9xxx_timer_interrupt(int irq, void *dev_id)
-{
- int timerno = irq - IRQ_TIMER0;
- u32 tc;
-
- write_seqlock(&xtime_lock);
- timer_tick();
- write_sequnlock(&xtime_lock);
-
- /* clear irq */
- tc = SYS_TC(timerno);
- if (REGGET(tc, SYS_TCx, REN) == SYS_TCx_REN_DIS) {
- REGSET(tc, SYS_TCx, TEN, DIS);
- SYS_TC(timerno) = tc;
- }
- REGSET(tc, SYS_TCx, INTC, SET);
- SYS_TC(timerno) = tc;
- REGSET(tc, SYS_TCx, INTC, UNSET);
- SYS_TC(timerno) = tc;
-
- return IRQ_HANDLED;
-}
-
-static struct irqaction ns9xxx_timer_irq = {
- .name = "NS9xxx Timer Tick",
- .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
- .handler = ns9xxx_timer_interrupt,
-};
+#define TIMER_CLOCKSOURCE 0
+#define TIMER_CLOCKEVENT 1
+static u32 latch;
static cycle_t ns9xxx_clocksource_read(void)
{
@@ -67,27 +39,96 @@
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
+static void ns9xxx_clockevent_setmode(enum clock_event_mode mode,
+ struct clock_event_device *clk)
+{
+ u32 tc = SYS_TC(TIMER_CLOCKEVENT);
+
+ switch(mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ SYS_TRC(TIMER_CLOCKEVENT) = latch;
+ REGSET(tc, SYS_TCx, REN, EN);
+ REGSET(tc, SYS_TCx, INTS, EN);
+ REGSET(tc, SYS_TCx, TEN, EN);
+ break;
+
+ case CLOCK_EVT_MODE_ONESHOT:
+ REGSET(tc, SYS_TCx, REN, DIS);
+ REGSET(tc, SYS_TCx, INTS, EN);
+
+ /* fall through */
+
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ case CLOCK_EVT_MODE_RESUME:
+ default:
+ REGSET(tc, SYS_TCx, TEN, DIS);
+ break;
+ }
+
+ SYS_TC(TIMER_CLOCKEVENT) = tc;
+}
+
+static int ns9xxx_clockevent_setnextevent(unsigned long evt,
+ struct clock_event_device *clk)
+{
+ u32 tc = SYS_TC(TIMER_CLOCKEVENT);
+
+ if (REGGET(tc, SYS_TCx, TEN)) {
+ REGSET(tc, SYS_TCx, TEN, DIS);
+ SYS_TC(TIMER_CLOCKEVENT) = tc;
+ }
+
+ REGSET(tc, SYS_TCx, TEN, EN);
+
+ SYS_TRC(TIMER_CLOCKEVENT) = evt;
+
+ SYS_TC(TIMER_CLOCKEVENT) = tc;
+
+ return 0;
+}
+
+static struct clock_event_device ns9xxx_clockevent_device = {
+ .name = "ns9xxx-timer" __stringify(TIMER_CLOCKEVENT),
+ .shift = 20,
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .set_mode = ns9xxx_clockevent_setmode,
+ .set_next_event = ns9xxx_clockevent_setnextevent,
+};
+
+static irqreturn_t ns9xxx_clockevent_handler(int irq, void *dev_id)
+{
+ int timerno = irq - IRQ_TIMER0;
+ u32 tc;
+
+ struct clock_event_device *evt = &ns9xxx_clockevent_device;
+
+ /* clear irq */
+ tc = SYS_TC(timerno);
+ if (REGGET(tc, SYS_TCx, REN) == SYS_TCx_REN_DIS) {
+ REGSET(tc, SYS_TCx, TEN, DIS);
+ SYS_TC(timerno) = tc;
+ }
+ REGSET(tc, SYS_TCx, INTC, SET);
+ SYS_TC(timerno) = tc;
+ REGSET(tc, SYS_TCx, INTC, UNSET);
+ SYS_TC(timerno) = tc;
+
+ evt->event_handler(evt);
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction ns9xxx_clockevent_action = {
+ .name = "ns9xxx-timer" __stringify(TIMER_CLOCKEVENT),
+ .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+ .handler = ns9xxx_clockevent_handler,
+};
+
static void __init ns9xxx_timer_init(void)
{
int tc;
- /* disable timer */
- if ((tc = SYS_TC(0)) & SYS_TCx_TEN)
- SYS_TC(0) = tc & ~SYS_TCx_TEN;
-
- SYS_TRC(0) = SH_DIV(ns9xxx_cpuclock(), (TIMERCLOCKSELECT * HZ), 0);
-
- REGSET(tc, SYS_TCx, TEN, EN);
- REGSET(tc, SYS_TCx, TLCS, DIV64); /* This must match TIMERCLOCKSELECT */
- REGSET(tc, SYS_TCx, INTS, EN);
- REGSET(tc, SYS_TCx, UDS, DOWN);
- REGSET(tc, SYS_TCx, TDBG, STOP);
- REGSET(tc, SYS_TCx, TSZ, 32);
- REGSET(tc, SYS_TCx, REN, EN);
- SYS_TC(0) = tc;
-
- setup_irq(IRQ_TIMER0, &ns9xxx_timer_irq);
-
tc = SYS_TC(TIMER_CLOCKSOURCE);
if (REGGET(tc, SYS_TCx, TEN)) {
REGSET(tc, SYS_TCx, TEN, DIS);
@@ -111,6 +152,31 @@
ns9xxx_clocksource.shift);
clocksource_register(&ns9xxx_clocksource);
+
+ latch = SH_DIV(ns9xxx_cpuclock(), HZ, 0);
+
+ tc = SYS_TC(TIMER_CLOCKEVENT);
+ REGSET(tc, SYS_TCx, TEN, DIS);
+ REGSET(tc, SYS_TCx, TDBG, STOP);
+ REGSET(tc, SYS_TCx, TLCS, CPU);
+ REGSET(tc, SYS_TCx, TM, IEE);
+ REGSET(tc, SYS_TCx, INTS, DIS);
+ REGSET(tc, SYS_TCx, UDS, DOWN);
+ REGSET(tc, SYS_TCx, TSZ, 32);
+ REGSET(tc, SYS_TCx, REN, EN);
+ SYS_TC(TIMER_CLOCKEVENT) = tc;
+
+ ns9xxx_clockevent_device.mult = div_sc(ns9xxx_cpuclock(),
+ NSEC_PER_SEC, ns9xxx_clockevent_device.shift);
+ ns9xxx_clockevent_device.max_delta_ns =
+ clockevent_delta2ns(-1, &ns9xxx_clockevent_device);
+ ns9xxx_clockevent_device.min_delta_ns =
+ clockevent_delta2ns(1, &ns9xxx_clockevent_device);
+
+ ns9xxx_clockevent_device.cpumask = cpumask_of_cpu(0);
+ clockevents_register_device(&ns9xxx_clockevent_device);
+
+ setup_irq(IRQ_TIMER0 + TIMER_CLOCKEVENT, &ns9xxx_clockevent_action);
}
struct sys_timer ns9xxx_timer = {