Blackfin: SMP: make core timers per-cpu clock events for HRT

SMP systems require per-cpu local clock event devices in order to enable
HRT support.  One a BF561, we can use local core timer for this purpose.
Originally, there was one global core-timer clock event device set up for
core A.

To accomplish this feat, we need to split the gptimer0/core timer logic
so that each is a standalone clock event.  There is no requirement that
we only have one clock event source anyways.  Once we have this, we just
define per-cpu clock event devices for each local core timer.

Signed-off-by: Yi Li <yi.li@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 105 insertions, 92 deletions

diff --git a/arch/blackfin/kernel/time-ts.c b/arch/blackfin/kernel/time-ts.c
index 17c38c5b5b22..a351f97c87a3 100644
--- a/arch/blackfin/kernel/time-ts.c
+++ b/arch/blackfin/kernel/time-ts.c
@@ -132,7 +132,6 @@ static int __init bfin_cs_gptimer0_init(void)
 # define bfin_cs_gptimer0_init()
 #endif
 
-
 #if defined(CONFIG_GPTMR0_CLOCKSOURCE) || defined(CONFIG_CYCLES_CLOCKSOURCE)
 /* prefer to use cycles since it has higher rating */
 notrace unsigned long long sched_clock(void)
@@ -145,47 +144,8 @@ notrace unsigned long long sched_clock(void)
 }
 #endif
 
-#ifdef CONFIG_CORE_TIMER_IRQ_L1
-__attribute__((l1_text))
-#endif
-irqreturn_t timer_interrupt(int irq, void *dev_id);
-
-static int bfin_timer_set_next_event(unsigned long, \
-                struct clock_event_device *);
-
-static void bfin_timer_set_mode(enum clock_event_mode, \
-                struct clock_event_device *);
-
-static struct clock_event_device clockevent_bfin = {
-#if defined(CONFIG_TICKSOURCE_GPTMR0)
-        .name           = "bfin_gptimer0",
-        .rating         = 300,
-        .irq            = IRQ_TIMER0,
-#else
-        .name           = "bfin_core_timer",
-        .rating         = 350,
-        .irq            = IRQ_CORETMR,
-#endif
-        .shift          = 32,
-        .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
-        .set_next_event = bfin_timer_set_next_event,
-        .set_mode       = bfin_timer_set_mode,
-};
-
-static struct irqaction bfin_timer_irq = {
-#if defined(CONFIG_TICKSOURCE_GPTMR0)
-        .name           = "Blackfin GPTimer0",
-#else
-        .name           = "Blackfin CoreTimer",
-#endif
-        .flags          = IRQF_DISABLED | IRQF_TIMER | \
-                          IRQF_IRQPOLL | IRQF_PERCPU,
-        .handler        = timer_interrupt,
-        .dev_id         = &clockevent_bfin,
-};
-
 #if defined(CONFIG_TICKSOURCE_GPTMR0)
-static int bfin_timer_set_next_event(unsigned long cycles,
+static int bfin_gptmr0_set_next_event(unsigned long cycles,
                                      struct clock_event_device *evt)
 {
         disable_gptimers(TIMER0bit);
@@ -196,7 +156,7 @@ static int bfin_timer_set_next_event(unsigned long cycles,
         return 0;
 }
 
-static void bfin_timer_set_mode(enum clock_event_mode mode,
+static void bfin_gptmr0_set_mode(enum clock_event_mode mode,
                                 struct clock_event_device *evt)
 {
         switch (mode) {
@@ -224,25 +184,65 @@ static void bfin_timer_set_mode(enum clock_event_mode mode,
         }
 }
 
-static void bfin_timer_ack(void)
+static void bfin_gptmr0_ack(void)
 {
         set_gptimer_status(TIMER_GROUP1, TIMER_STATUS_TIMIL0);
 }
 
-static void __init bfin_timer_init(void)
+static void __init bfin_gptmr0_init(void)
 {
         disable_gptimers(TIMER0bit);
 }
 
-static unsigned long  __init bfin_clockevent_check(void)
+#ifdef CONFIG_CORE_TIMER_IRQ_L1
+__attribute__((l1_text))
+#endif
+irqreturn_t bfin_gptmr0_interrupt(int irq, void *dev_id)
 {
-        setup_irq(IRQ_TIMER0, &bfin_timer_irq);
-        return get_sclk();
+        struct clock_event_device *evt = dev_id;
+        smp_mb();
+        evt->event_handler(evt);
+        bfin_gptmr0_ack();
+        return IRQ_HANDLED;
 }
 
-#else /* CONFIG_TICKSOURCE_CORETMR */
+static struct irqaction gptmr0_irq = {
+        .name           = "Blackfin GPTimer0",
+        .flags          = IRQF_DISABLED | IRQF_TIMER | \
+                          IRQF_IRQPOLL | IRQF_PERCPU,
+        .handler        = bfin_gptmr0_interrupt,
+};
 
-static int bfin_timer_set_next_event(unsigned long cycles,
+static struct clock_event_device clockevent_gptmr0 = {
+        .name           = "bfin_gptimer0",
+        .rating         = 300,
+        .irq            = IRQ_TIMER0,
+        .shift          = 32,
+        .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+        .set_next_event = bfin_gptmr0_set_next_event,
+        .set_mode       = bfin_gptmr0_set_mode,
+};
+
+static void __init bfin_gptmr0_clockevent_init(struct clock_event_device *evt)
+{
+        unsigned long clock_tick;
+
+        clock_tick = get_sclk();
+        evt->mult = div_sc(clock_tick, NSEC_PER_SEC, evt->shift);
+        evt->max_delta_ns = clockevent_delta2ns(-1, evt);
+        evt->min_delta_ns = clockevent_delta2ns(100, evt);
+
+        evt->cpumask = cpumask_of(0);
+
+        clockevents_register_device(evt);
+}
+#endif /* CONFIG_TICKSOURCE_GPTMR0 */
+
+#if defined(CONFIG_TICKSOURCE_CORETMR)
+/* per-cpu local core timer */
+static DEFINE_PER_CPU(struct clock_event_device, coretmr_events);
+
+static int bfin_coretmr_set_next_event(unsigned long cycles,
                                 struct clock_event_device *evt)
 {
         bfin_write_TCNTL(TMPWR);
@@ -253,7 +253,7 @@ static int bfin_timer_set_next_event(unsigned long cycles,
         return 0;
 }
 
-static void bfin_timer_set_mode(enum clock_event_mode mode,
+static void bfin_coretmr_set_mode(enum clock_event_mode mode,
                                 struct clock_event_device *evt)
 {
         switch (mode) {
@@ -285,19 +285,13 @@ static void bfin_timer_set_mode(enum clock_event_mode mode,
         }
 }
 
-static void bfin_timer_ack(void)
-{
-}
-
-static void __init bfin_timer_init(void)
+void bfin_coretmr_init(void)
 {
         /* power up the timer, but don't enable it just yet */
         bfin_write_TCNTL(TMPWR);
         CSYNC();
 
-        /*
-         * the TSCALE prescaler counter.
-         */
+        /* the TSCALE prescaler counter. */
         bfin_write_TSCALE(TIME_SCALE - 1);
         bfin_write_TPERIOD(0);
         bfin_write_TCOUNT(0);
@@ -305,48 +299,51 @@ static void __init bfin_timer_init(void)
         CSYNC();
 }
 
-static unsigned long  __init bfin_clockevent_check(void)
-{
-        setup_irq(IRQ_CORETMR, &bfin_timer_irq);
-        return get_cclk() / TIME_SCALE;
-}
-
-void __init setup_core_timer(void)
+#ifdef CONFIG_CORE_TIMER_IRQ_L1
+__attribute__((l1_text))
+#endif
+irqreturn_t bfin_coretmr_interrupt(int irq, void *dev_id)
 {
-        bfin_timer_init();
-        bfin_timer_set_mode(CLOCK_EVT_MODE_PERIODIC, NULL);
-}
-#endif /* CONFIG_TICKSOURCE_GPTMR0 */
+        int cpu = smp_processor_id();
+        struct clock_event_device *evt = &per_cpu(coretmr_events, cpu);
 
-/*
- * timer_interrupt() needs to keep up the real-time clock,
- * as well as call the "do_timer()" routine every clocktick
- */
-irqreturn_t timer_interrupt(int irq, void *dev_id)
-{
-        struct clock_event_device *evt = dev_id;
         smp_mb();
         evt->event_handler(evt);
-        bfin_timer_ack();
         return IRQ_HANDLED;
 }
 
-static int __init bfin_clockevent_init(void)
-{
-        unsigned long timer_clk;
-
-        timer_clk = bfin_clockevent_check();
-
-        bfin_timer_init();
-
-        clockevent_bfin.mult = div_sc(timer_clk, NSEC_PER_SEC, clockevent_bfin.shift);
-        clockevent_bfin.max_delta_ns = clockevent_delta2ns(-1, &clockevent_bfin);
-        clockevent_bfin.min_delta_ns = clockevent_delta2ns(100, &clockevent_bfin);
-        clockevent_bfin.cpumask = cpumask_of(0);
-        clockevents_register_device(&clockevent_bfin);
+static struct irqaction coretmr_irq = {
+        .name           = "Blackfin CoreTimer",
+        .flags          = IRQF_DISABLED | IRQF_TIMER | \
+                          IRQF_IRQPOLL | IRQF_PERCPU,
+        .handler        = bfin_coretmr_interrupt,
+};
 
-        return 0;
+void bfin_coretmr_clockevent_init(void)
+{
+        unsigned long clock_tick;
+        unsigned int cpu = smp_processor_id();
+        struct clock_event_device *evt = &per_cpu(coretmr_events, cpu);
+
+        evt->name = "bfin_core_timer";
+        evt->rating = 350;
+        evt->irq = -1;
+        evt->shift = 32;
+        evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
+        evt->set_next_event = bfin_coretmr_set_next_event;
+        evt->set_mode = bfin_coretmr_set_mode;
+
+        clock_tick = get_cclk() / TIME_SCALE;
+        evt->mult = div_sc(clock_tick, NSEC_PER_SEC, evt->shift);
+        evt->max_delta_ns = clockevent_delta2ns(-1, evt);
+        evt->min_delta_ns = clockevent_delta2ns(100, evt);
+
+        evt->cpumask = cpumask_of(cpu);
+
+        clockevents_register_device(evt);
 }
+#endif /* CONFIG_TICKSOURCE_CORETMR */
+
 
 void __init time_init(void)
 {
@@ -370,5 +367,21 @@ void __init time_init(void)
 
         bfin_cs_cycles_init();
         bfin_cs_gptimer0_init();
-        bfin_clockevent_init();
+
+#if defined(CONFIG_TICKSOURCE_CORETMR)
+        bfin_coretmr_init();
+        setup_irq(IRQ_CORETMR, &coretmr_irq);
+        bfin_coretmr_clockevent_init();
+#endif
+
+#if defined(CONFIG_TICKSOURCE_GPTMR0)
+        bfin_gptmr0_init();
+        setup_irq(IRQ_TIMER0, &gptmr0_irq);
+        gptmr0_irq.dev_id = &clockevent_gptmr0;
+        bfin_gptmr0_clockevent_init(&clockevent_gptmr0);
+#endif
+
+#if !defined(CONFIG_TICKSOURCE_CORETMR) && !defined(CONFIG_TICKSOURCE_GPTMR0)
+# error at least one clock event device is required
+#endif
 }