[PATCH v4 01/18] xen/arm: timer: replace timer_dt_irq by timer_get_irq

[Julien Grall <julien.grall@linaro.org>]

The function is nearly only used to retrieve the IRQ number.

There is one place where the IRQ type is used (in domain_build.c) but
as the timer IRQ is virtualised for guest we might not have the same property
(e.g active-low level sensitive interrupt).

Replace timer_dt_irq by timer_get_irq which will return the IRQ number.

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

---
    Changes in v2:
        - Patch added
---
 xen/arch/arm/domain_build.c |   23 +++++++++++++----------
 xen/arch/arm/time.c         |    4 ++--
 xen/arch/arm/vtimer.c       |    4 ++--
 xen/include/asm-arm/time.h  |    4 ++--
 4 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 187e071..7bc9bf6 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -616,7 +616,7 @@ static int make_timer_node(const struct domain *d, void *fdt,
     u32 len;
     const void *compatible;
     int res;
-    const struct dt_irq *irq;
+    unsigned int irq;
     gic_interrupt_t intrs[3];
     u32 clock_frequency;
     bool_t clock_valid;
@@ -645,17 +645,20 @@ static int make_timer_node(const struct domain *d, void *fdt,
     if ( res )
         return res;
 
-    irq = timer_dt_irq(TIMER_PHYS_SECURE_PPI);
-    DPRINT("  Secure interrupt %u\n", irq->irq);
-    set_interrupt_ppi(intrs[0], irq->irq, 0xf, irq->type);
+    /* The timer IRQ is emulated by Xen. It always exposes an active-low
+     * level-sensitive interrupt */
 
-    irq = timer_dt_irq(TIMER_PHYS_NONSECURE_PPI);
-    DPRINT("  Non secure interrupt %u\n", irq->irq);
-    set_interrupt_ppi(intrs[1], irq->irq, 0xf, irq->type);
+    irq = timer_get_irq(TIMER_PHYS_SECURE_PPI);
+    DPRINT("  Secure interrupt %u\n", irq);
+    set_interrupt_ppi(intrs[0], irq, 0xf, DT_IRQ_TYPE_LEVEL_LOW);
 
-    irq = timer_dt_irq(TIMER_VIRT_PPI);
-    DPRINT("  Virt interrupt %u\n", irq->irq);
-    set_interrupt_ppi(intrs[2], irq->irq, 0xf, irq->type);
+    irq = timer_get_irq(TIMER_PHYS_NONSECURE_PPI);
+    DPRINT("  Non secure interrupt %u\n", irq);
+    set_interrupt_ppi(intrs[1], irq, 0xf, DT_IRQ_TYPE_LEVEL_LOW);
+
+    irq = timer_get_irq(TIMER_VIRT_PPI);
+    DPRINT("  Virt interrupt %u\n", irq);
+    set_interrupt_ppi(intrs[2], irq, 0xf, DT_IRQ_TYPE_LEVEL_LOW);
 
     res = fdt_property_interrupts(fdt, intrs, 3);
     if ( res )
diff --git a/xen/arch/arm/time.c b/xen/arch/arm/time.c
index 8dd4bea..7cad888 100644
--- a/xen/arch/arm/time.c
+++ b/xen/arch/arm/time.c
@@ -50,11 +50,11 @@ unsigned long __read_mostly cpu_khz;  /* CPU clock frequency in kHz. */
 
 static struct dt_irq timer_irq[MAX_TIMER_PPI];
 
-const struct dt_irq *timer_dt_irq(enum timer_ppi ppi)
+unsigned int timer_get_irq(enum timer_ppi ppi)
 {
     ASSERT(ppi >= TIMER_PHYS_SECURE_PPI && ppi < MAX_TIMER_PPI);
 
-    return &timer_irq[ppi];
+    return timer_irq[ppi].irq;
 }
 
 /*static inline*/ s_time_t ticks_to_ns(uint64_t ticks)
diff --git a/xen/arch/arm/vtimer.c b/xen/arch/arm/vtimer.c
index cb690bb..4822d4f 100644
--- a/xen/arch/arm/vtimer.c
+++ b/xen/arch/arm/vtimer.c
@@ -65,7 +65,7 @@ int vcpu_vtimer_init(struct vcpu *v)
     t->ctl = 0;
     t->cval = NOW();
     t->irq = d0
-        ? timer_dt_irq(TIMER_PHYS_NONSECURE_PPI)->irq
+        ? timer_get_irq(TIMER_PHYS_NONSECURE_PPI)
         : GUEST_TIMER_PHYS_NS_PPI;
     t->v = v;
 
@@ -73,7 +73,7 @@ int vcpu_vtimer_init(struct vcpu *v)
     init_timer(&t->timer, virt_timer_expired, t, v->processor);
     t->ctl = 0;
     t->irq = d0
-        ? timer_dt_irq(TIMER_VIRT_PPI)->irq
+        ? timer_get_irq(TIMER_VIRT_PPI)
         : GUEST_TIMER_VIRT_PPI;
     t->v = v;
 
diff --git a/xen/include/asm-arm/time.h b/xen/include/asm-arm/time.h
index d10c737..9bbab0b 100644
--- a/xen/include/asm-arm/time.h
+++ b/xen/include/asm-arm/time.h
@@ -22,8 +22,8 @@ enum timer_ppi
     MAX_TIMER_PPI = 4,
 };
 
-/* Get one of the timer IRQ description */
-const struct dt_irq* timer_dt_irq(enum timer_ppi ppi);
+/* Get one of the timer IRQ number */
+unsigned int timer_get_irq(enum timer_ppi ppi);
 
 /* Route timer's IRQ on this CPU */
 extern void __cpuinit route_timer_interrupt(void);
-- 
1.7.10.4