* the Free Software Foundation.
*/
#include <linux/interrupt.h>
+#include <linux/kernel_stat.h>
+#include <asm/io.h>
#include <asm/mach/irq.h>
#include <asm/mach-types.h>
-#include <asm/arch-ns9xxx/regs-sys.h>
+#include <asm/arch-ns9xxx/regs-sys-common.h>
#include <asm/arch-ns9xxx/irqs.h>
#include <asm/arch-ns9xxx/board.h>
#include "generic.h"
-static void ns9xxx_ack_irq_timer(unsigned int irq)
-{
- u32 tc = SYS_TC(irq - IRQ_TIMER0);
-
- /*
- * If the timer is programmed to halt on terminal count, the
- * timer must be disabled before clearing the interrupt.
- */
- if (REGGET(tc, SYS_TCx, REN) == 0) {
- REGSET(tc, SYS_TCx, TEN, DIS);
- SYS_TC(irq - IRQ_TIMER0) = tc;
- }
-
- REGSET(tc, SYS_TCx, INTC, SET);
- SYS_TC(irq - IRQ_TIMER0) = tc;
-
- REGSET(tc, SYS_TCx, INTC, UNSET);
- SYS_TC(irq - IRQ_TIMER0) = tc;
-}
-
-static void (*ns9xxx_ack_irq_functions[NR_IRQS])(unsigned int) = {
- [IRQ_TIMER0] = ns9xxx_ack_irq_timer,
- [IRQ_TIMER1] = ns9xxx_ack_irq_timer,
- [IRQ_TIMER2] = ns9xxx_ack_irq_timer,
- [IRQ_TIMER3] = ns9xxx_ack_irq_timer,
-};
+/* simple interrupt prio table: prio(x) < prio(y) <=> x < y */
+#define irq2prio(i) (i)
+#define prio2irq(p) (p)
static void ns9xxx_mask_irq(unsigned int irq)
{
/* XXX: better use cpp symbols */
- SYS_IC(irq / 4) &= ~(1 << (7 + 8 * (3 - (irq & 3))));
+ int prio = irq2prio(irq);
+ u32 ic = __raw_readl(SYS_IC(prio / 4));
+ ic &= ~(1 << (7 + 8 * (3 - (prio & 3))));
+ __raw_writel(ic, SYS_IC(prio / 4));
}
static void ns9xxx_ack_irq(unsigned int irq)
{
- if (!ns9xxx_ack_irq_functions[irq]) {
- printk(KERN_ERR "no ack function for irq %u\n", irq);
- BUG();
- }
-
- ns9xxx_ack_irq_functions[irq](irq);
- SYS_ISRADDR = 0;
+ __raw_writel(0, SYS_ISRADDR);
}
static void ns9xxx_maskack_irq(unsigned int irq)
static void ns9xxx_unmask_irq(unsigned int irq)
{
/* XXX: better use cpp symbols */
- SYS_IC(irq / 4) |= 1 << (7 + 8 * (3 - (irq & 3)));
+ int prio = irq2prio(irq);
+ u32 ic = __raw_readl(SYS_IC(prio / 4));
+ ic |= 1 << (7 + 8 * (3 - (prio & 3)));
+ __raw_writel(ic, SYS_IC(prio / 4));
}
static struct irq_chip ns9xxx_chip = {
.unmask = ns9xxx_unmask_irq,
};
+#if 0
+#define handle_irq handle_level_irq
+#else
+static void handle_prio_irq(unsigned int irq, struct irq_desc *desc)
+{
+ unsigned int cpu = smp_processor_id();
+ struct irqaction *action;
+ irqreturn_t action_ret;
+
+ spin_lock(&desc->lock);
+
+ BUG_ON(desc->status & IRQ_INPROGRESS);
+
+ desc->status &= ~(IRQ_REPLAY | IRQ_WAITING);
+ kstat_cpu(cpu).irqs[irq]++;
+
+ action = desc->action;
+ if (unlikely(!action || (desc->status & IRQ_DISABLED)))
+ goto out_mask;
+
+ desc->status |= IRQ_INPROGRESS;
+ spin_unlock(&desc->lock);
+
+ action_ret = handle_IRQ_event(irq, action);
+
+ /* XXX: There is no direct way to access noirqdebug, so check
+ * unconditionally for spurious irqs...
+ * Maybe this function should go to kernel/irq/chip.c? */
+ note_interrupt(irq, desc, action_ret);
+
+ spin_lock(&desc->lock);
+ desc->status &= ~IRQ_INPROGRESS;
+
+ if (desc->status & IRQ_DISABLED)
+out_mask:
+ desc->chip->mask(irq);
+
+ /* ack unconditionally to unmask lower prio irqs */
+ desc->chip->ack(irq);
+
+ spin_unlock(&desc->lock);
+}
+#define handle_irq handle_prio_irq
+#endif
+
void __init ns9xxx_init_irq(void)
{
int i;
/* disable all IRQs */
for (i = 0; i < 8; ++i)
- SYS_IC(i) = (4 * i) << 24 | (4 * i + 1) << 16 |
- (4 * i + 2) << 8 | (4 * i + 3);
+ __raw_writel(prio2irq(4 * i) << 24 |
+ prio2irq(4 * i + 1) << 16 |
+ prio2irq(4 * i + 2) << 8 |
+ prio2irq(4 * i + 3),
+ SYS_IC(i));
- /* simple interrupt prio table:
- * prio(x) < prio(y) <=> x < y
- */
for (i = 0; i < 32; ++i)
- SYS_IVA(i) = i;
+ __raw_writel(prio2irq(i), SYS_IVA(i));
- for (i = IRQ_WATCHDOG; i <= IRQ_EXT3; ++i) {
+ for (i = 0; i <= 31; ++i) {
set_irq_chip(i, &ns9xxx_chip);
- set_irq_handler(i, handle_level_irq);
+ set_irq_handler(i, handle_irq);
set_irq_flags(i, IRQF_VALID);
}
}