Merge branch 'linus' into timers/hpet
[sfrench/cifs-2.6.git] / drivers / char / hpet.c
index b3f5dbc6d8807c7a51cf352118bf5ea08e35d635..f3981ffe20f0ee307bfe7b0197cc6397d40a3652 100644 (file)
@@ -185,6 +185,67 @@ static irqreturn_t hpet_interrupt(int irq, void *data)
        return IRQ_HANDLED;
 }
 
+static void hpet_timer_set_irq(struct hpet_dev *devp)
+{
+       unsigned long v;
+       int irq, gsi;
+       struct hpet_timer __iomem *timer;
+
+       spin_lock_irq(&hpet_lock);
+       if (devp->hd_hdwirq) {
+               spin_unlock_irq(&hpet_lock);
+               return;
+       }
+
+       timer = devp->hd_timer;
+
+       /* we prefer level triggered mode */
+       v = readl(&timer->hpet_config);
+       if (!(v & Tn_INT_TYPE_CNF_MASK)) {
+               v |= Tn_INT_TYPE_CNF_MASK;
+               writel(v, &timer->hpet_config);
+       }
+       spin_unlock_irq(&hpet_lock);
+
+       v = (readq(&timer->hpet_config) & Tn_INT_ROUTE_CAP_MASK) >>
+                                Tn_INT_ROUTE_CAP_SHIFT;
+
+       /*
+        * In PIC mode, skip IRQ0-4, IRQ6-9, IRQ12-15 which is always used by
+        * legacy device. In IO APIC mode, we skip all the legacy IRQS.
+        */
+       if (acpi_irq_model == ACPI_IRQ_MODEL_PIC)
+               v &= ~0xf3df;
+       else
+               v &= ~0xffff;
+
+       for (irq = find_first_bit(&v, HPET_MAX_IRQ); irq < HPET_MAX_IRQ;
+               irq = find_next_bit(&v, HPET_MAX_IRQ, 1 + irq)) {
+
+               if (irq >= NR_IRQS) {
+                       irq = HPET_MAX_IRQ;
+                       break;
+               }
+
+               gsi = acpi_register_gsi(irq, ACPI_LEVEL_SENSITIVE,
+                                       ACPI_ACTIVE_LOW);
+               if (gsi > 0)
+                       break;
+
+               /* FIXME: Setup interrupt source table */
+       }
+
+       if (irq < HPET_MAX_IRQ) {
+               spin_lock_irq(&hpet_lock);
+               v = readl(&timer->hpet_config);
+               v |= irq << Tn_INT_ROUTE_CNF_SHIFT;
+               writel(v, &timer->hpet_config);
+               devp->hd_hdwirq = gsi;
+               spin_unlock_irq(&hpet_lock);
+       }
+       return;
+}
+
 static int hpet_open(struct inode *inode, struct file *file)
 {
        struct hpet_dev *devp;
@@ -219,6 +280,8 @@ static int hpet_open(struct inode *inode, struct file *file)
        spin_unlock_irq(&hpet_lock);
        unlock_kernel();
 
+       hpet_timer_set_irq(devp);
+
        return 0;
 }