[MIPS] SNI: Convert a20r timer to clockevent device.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 64 insertions, 16 deletions

diff --git a/arch/mips/sni/time.c b/arch/mips/sni/time.c
index 0910b35cb71f..60bc62ef0935 100644
--- a/arch/mips/sni/time.c
+++ b/arch/mips/sni/time.c
@@ -11,27 +11,78 @@
 #define SNI_COUNTER2_DIV        64
 #define SNI_COUNTER0_DIV        ((SNI_CLOCK_TICK_RATE / SNI_COUNTER2_DIV) / HZ)
 
-static void sni_a20r_timer_ack(void)
+static void a20r_set_mode(enum clock_event_mode mode,
+                          struct clock_event_device *evt)
 {
-        *(volatile u8 *)A20R_PT_TIM0_ACK = 0x0; wmb();
+        switch (mode) {
+        case CLOCK_EVT_MODE_PERIODIC:
+                *(volatile u8 *)(A20R_PT_CLOCK_BASE + 12) = 0x34;
+                wmb();
+                *(volatile u8 *)(A20R_PT_CLOCK_BASE +  0) = SNI_COUNTER0_DIV;
+                wmb();
+                *(volatile u8 *)(A20R_PT_CLOCK_BASE +  0) = SNI_COUNTER0_DIV >> 8;
+                wmb();
+
+                *(volatile u8 *)(A20R_PT_CLOCK_BASE + 12) = 0xb4;
+                wmb();
+                *(volatile u8 *)(A20R_PT_CLOCK_BASE +  8) = SNI_COUNTER2_DIV;
+                wmb();
+                *(volatile u8 *)(A20R_PT_CLOCK_BASE +  8) = SNI_COUNTER2_DIV >> 8;
+                wmb();
+
+                break;
+        case CLOCK_EVT_MODE_ONESHOT:
+        case CLOCK_EVT_MODE_UNUSED:
+        case CLOCK_EVT_MODE_SHUTDOWN:
+                break;
+        case CLOCK_EVT_MODE_RESUME:
+                break;
+        }
 }
 
+static struct clock_event_device a20r_clockevent_device = {
+        .name           = "a20r-timer",
+        .features       = CLOCK_EVT_FEAT_PERIODIC,
+
+        /* .mult, .shift, .max_delta_ns and .min_delta_ns left uninitialized */
+
+        .rating         = 300,
+        .irq            = SNI_A20R_IRQ_TIMER,
+        .set_mode       = a20r_set_mode,
+};
+
+static irqreturn_t a20r_interrupt(int irq, void *dev_id)
+{
+        struct clock_event_device *cd = dev_id;
+
+        *(volatile u8 *)A20R_PT_TIM0_ACK = 0;
+        wmb();
+
+        cd->event_handler(cd);
+
+        return IRQ_HANDLED;
+}
+
+static struct irqaction a20r_irqaction = {
+        .handler        = a20r_interrupt,
+        .flags          = IRQF_DISABLED | IRQF_PERCPU,
+        .name           = "a20r-timer",
+};
+
 /*
  * a20r platform uses 2 counters to divide the input frequency.
  * Counter 2 output is connected to Counter 0 & 1 input.
  */
-static void __init sni_a20r_timer_setup(struct irqaction *irq)
+static void __init sni_a20r_timer_setup(void)
 {
-        *(volatile u8 *)(A20R_PT_CLOCK_BASE + 12) = 0x34; wmb();
-        *(volatile u8 *)(A20R_PT_CLOCK_BASE +  0) = (SNI_COUNTER0_DIV) & 0xff; wmb();
-        *(volatile u8 *)(A20R_PT_CLOCK_BASE +  0) = (SNI_COUNTER0_DIV >> 8) & 0xff; wmb();
+        struct clock_event_device *cd = &a20r_clockevent_device;
+        struct irqaction *action = &a20r_irqaction;
+        unsigned int cpu = smp_processor_id();
 
-        *(volatile u8 *)(A20R_PT_CLOCK_BASE + 12) = 0xb4; wmb();
-        *(volatile u8 *)(A20R_PT_CLOCK_BASE +  8) = (SNI_COUNTER2_DIV) & 0xff; wmb();
-        *(volatile u8 *)(A20R_PT_CLOCK_BASE +  8) = (SNI_COUNTER2_DIV >> 8) & 0xff; wmb();
+        cd->cpumask             = cpumask_of_cpu(cpu);
 
-        setup_irq(SNI_A20R_IRQ_TIMER, irq);
-        mips_timer_ack = sni_a20r_timer_ack;
+        action->dev_id = cd;
+        setup_irq(SNI_A20R_IRQ_TIMER, &a20r_irqaction);
 }
 
 #define SNI_8254_TICK_RATE        1193182UL
@@ -119,17 +170,14 @@ void __init plat_time_init(void)
         mips_hpt_frequency = r4k_tick * HZ;
 
         setup_pit_timer();
-}
 
-void __init plat_timer_setup(struct irqaction *irq)
-{
         switch (sni_brd_type) {
         case SNI_BRD_10:
         case SNI_BRD_10NEW:
         case SNI_BRD_TOWER_OASIC:
         case SNI_BRD_MINITOWER:
-                sni_a20r_timer_setup(irq);
-                break;
+                sni_a20r_timer_setup();
+                break;
         }
 }