Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c0bb87f7b8a145b56d45484713e1b1f37ce7e626
Commit:     c0bb87f7b8a145b56d45484713e1b1f37ce7e626
Parent:     cef5975d453bbc1bbf29ceb7d80749feebc22a74
Author:     Uwe Kleine-König <[EMAIL PROTECTED]>
AuthorDate: Sun Sep 30 20:36:00 2007 +0100
Committer:  Russell King <[EMAIL PROTECTED]>
CommitDate: Fri Oct 12 23:43:37 2007 +0100

    [ARM] 4593/1: ns9xxx: implement generic clockevents
    
    Signed-off-by: Uwe Kleine-König <[EMAIL PROTECTED]>
    Signed-off-by: Russell King <[EMAIL PROTECTED]>
---
 arch/arm/Kconfig            |    1 +
 arch/arm/mach-ns9xxx/time.c |  150 +++++++++++++++++++++++++++++++------------
 2 files changed, 109 insertions(+), 42 deletions(-)

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 @@ config ARCH_NS9XXX
        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>
@@ -20,18 +21,87 @@
 #include <asm/arch/system.h>
 #include "generic.h"
 
-#define TIMERCLOCKSELECT 64
-#define TIMER_CLOCKSOURCE 1
+#define TIMER_CLOCKSOURCE 0
+#define TIMER_CLOCKEVENT 1
+static u32 latch;
 
-static irqreturn_t
-ns9xxx_timer_interrupt(int irq, void *dev_id)
+static cycle_t ns9xxx_clocksource_read(void)
+{
+       return SYS_TR(TIMER_CLOCKSOURCE);
+}
+
+static struct clocksource ns9xxx_clocksource = {
+       .name   = "ns9xxx-timer" __stringify(TIMER_CLOCKSOURCE),
+       .rating = 300,
+       .read   = ns9xxx_clocksource_read,
+       .mask   = CLOCKSOURCE_MASK(32),
+       .shift  = 20,
+       .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;
 
-       write_seqlock(&xtime_lock);
-       timer_tick();
-       write_sequnlock(&xtime_lock);
+       struct clock_event_device *evt = &ns9xxx_clockevent_device;
 
        /* clear irq */
        tc = SYS_TC(timerno);
@@ -44,50 +114,21 @@ ns9xxx_timer_interrupt(int irq, void *dev_id)
        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,
-};
+       evt->event_handler(evt);
 
-static cycle_t ns9xxx_clocksource_read(void)
-{
-       return SYS_TR(TIMER_CLOCKSOURCE);
+       return IRQ_HANDLED;
 }
 
-static struct clocksource ns9xxx_clocksource = {
-       .name   = "ns9xxx-timer" __stringify(TIMER_CLOCKSOURCE),
-       .rating = 300,
-       .read   = ns9xxx_clocksource_read,
-       .mask   = CLOCKSOURCE_MASK(32),
-       .shift  = 20,
-       .flags  = CLOCK_SOURCE_IS_CONTINUOUS,
+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 @@ static void __init ns9xxx_timer_init(void)
                        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 = {
-
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