[PATCH 18/28] m68k/amiga: Optimize interrupts using chain handlers

Geert Uytterhoeven
2011-09-11T11:59:44Z

v3: Use handle_simple_irq() instead of handle_level_irq()
Small updates for rename of m68k_handle_int() to generic_handle_irq()

v2: Added this changeset
---
arch/m68k/amiga/amiints.c | 104 +++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 104 insertions(+), 0 deletions(-)

diff --git a/arch/m68k/amiga/amiints.c b/arch/m68k/amiga/amiints.c
index c3da534..a8da471 100644
--- a/arch/m68k/amiga/amiints.c
+++ b/arch/m68k/amiga/amiints.c
@@ -48,6 +48,99 @@ static struct irq_chip amiga_irq_chip = {
* The builtin Amiga hardware interrupt handlers.
*/

+#ifdef CONFIG_GENERIC_HARDIRQS
+static void ami_int1(unsigned int irq, struct irq_desc *desc)
+{
+ unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
+
+ /* if serial transmit buffer empty, interrupt */
+ if (ints & IF_TBE) {
+ amiga_custom.intreq = IF_TBE;
+ generic_handle_irq(IRQ_AMIGA_TBE);
+ }
+
+ /* if floppy disk transfer complete, interrupt */
+ if (ints & IF_DSKBLK) {
+ amiga_custom.intreq = IF_DSKBLK;
+ generic_handle_irq(IRQ_AMIGA_DSKBLK);
+ }
+
+ /* if software interrupt set, interrupt */
+ if (ints & IF_SOFT) {
+ amiga_custom.intreq = IF_SOFT;
+ generic_handle_irq(IRQ_AMIGA_SOFT);
+ }
+}
+
+static void ami_int3(unsigned int irq, struct irq_desc *desc)
+{
+ unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
+
+ /* if a blitter interrupt */
+ if (ints & IF_BLIT) {
+ amiga_custom.intreq = IF_BLIT;
+ generic_handle_irq(IRQ_AMIGA_BLIT);
+ }
+
+ /* if a copper interrupt */
+ if (ints & IF_COPER) {
+ amiga_custom.intreq = IF_COPER;
+ generic_handle_irq(IRQ_AMIGA_COPPER);
+ }
+
+ /* if a vertical blank interrupt */
+ if (ints & IF_VERTB) {
+ amiga_custom.intreq = IF_VERTB;
+ generic_handle_irq(IRQ_AMIGA_VERTB);
+ }
+}
+
+static void ami_int4(unsigned int irq, struct irq_desc *desc)
+{
+ unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
+
+ /* if audio 0 interrupt */
+ if (ints & IF_AUD0) {
+ amiga_custom.intreq = IF_AUD0;
+ generic_handle_irq(IRQ_AMIGA_AUD0);
+ }
+
+ /* if audio 1 interrupt */
+ if (ints & IF_AUD1) {
+ amiga_custom.intreq = IF_AUD1;
+ generic_handle_irq(IRQ_AMIGA_AUD1);
+ }
+
+ /* if audio 2 interrupt */
+ if (ints & IF_AUD2) {
+ amiga_custom.intreq = IF_AUD2;
+ generic_handle_irq(IRQ_AMIGA_AUD2);
+ }
+
+ /* if audio 3 interrupt */
+ if (ints & IF_AUD3) {
+ amiga_custom.intreq = IF_AUD3;
+ generic_handle_irq(IRQ_AMIGA_AUD3);
+ }
+}
+
+static void ami_int5(unsigned int irq, struct irq_desc *desc)
+{
+ unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
+
+ /* if serial receive buffer full interrupt */
+ if (ints & IF_RBF) {
+ /* acknowledge of IF_RBF must be done by the serial interrupt */
+ generic_handle_irq(IRQ_AMIGA_RBF);
+ }
+
+ /* if a disk sync interrupt */
+ if (ints & IF_DSKSYN) {
+ amiga_custom.intreq = IF_DSKSYN;
+ generic_handle_irq(IRQ_AMIGA_DSKSYN);
+ }
+}
+#else /* !CONFIG_GENERIC_HARDIRQS */
static irqreturn_t ami_int1(int irq, void *dev_id)
{
unsigned short ints = amiga_custom.intreqr & amiga_custom.intenar;
@@ -143,6 +236,7 @@ static irqreturn_t ami_int5(int irq, void *dev_id)
}
return IRQ_HANDLED;
}
+#endif /* !CONFIG_GENERIC_HARDIRQS */

/*
@@ -158,6 +252,15 @@ static irqreturn_t ami_int5(int irq, void *dev_id)

void __init amiga_init_IRQ(void)
{
+#ifdef CONFIG_GENERIC_HARDIRQS
+ m68k_setup_irq_controller(&amiga_irq_chip, handle_simple_irq, IRQ_USER,
+ AMI_STD_IRQS);
+
+ irq_set_chained_handler(IRQ_AUTO_1, ami_int1);
+ irq_set_chained_handler(IRQ_AUTO_3, ami_int3);
+ irq_set_chained_handler(IRQ_AUTO_4, ami_int4);
+ irq_set_chained_handler(IRQ_AUTO_5, ami_int5);
+#else /* !CONFIG_GENERIC_HARDIRQS */
if (request_irq(IRQ_AUTO_1, ami_int1, 0, "int1", NULL))
pr_err("Couldn't register int%d\n", 1);
if (request_irq(IRQ_AUTO_3, ami_int3, 0, "int3", NULL))
@@ -169,6 +272,7 @@ void __init amiga_init_IRQ(void)

m68k_setup_irq_controller(&amiga_irq_chip, handle_simple_irq, IRQ_USER,
AMI_STD_IRQS);
+#endif /* !CONFIG_GENERIC_HARDIRQS */

/* turn off PCMCIA interrupts */
if (AMIGAHW_PRESENT(PCMCIA))
--
1.7.0.4