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Diffstat (limited to 'arch/arm/mach-rpc/irq.c')
-rw-r--r--arch/arm/mach-rpc/irq.c162
1 files changed, 162 insertions, 0 deletions
diff --git a/arch/arm/mach-rpc/irq.c b/arch/arm/mach-rpc/irq.c
new file mode 100644
index 000000000000..56b2716f8cf5
--- /dev/null
+++ b/arch/arm/mach-rpc/irq.c
@@ -0,0 +1,162 @@
+#include <linux/init.h>
+#include <linux/list.h>
+
+#include <asm/mach/irq.h>
+#include <asm/hardware/iomd.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+static void iomd_ack_irq_a(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << irq;
+ val = iomd_readb(IOMD_IRQMASKA);
+ iomd_writeb(val & ~mask, IOMD_IRQMASKA);
+ iomd_writeb(mask, IOMD_IRQCLRA);
+}
+
+static void iomd_mask_irq_a(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << irq;
+ val = iomd_readb(IOMD_IRQMASKA);
+ iomd_writeb(val & ~mask, IOMD_IRQMASKA);
+}
+
+static void iomd_unmask_irq_a(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << irq;
+ val = iomd_readb(IOMD_IRQMASKA);
+ iomd_writeb(val | mask, IOMD_IRQMASKA);
+}
+
+static struct irqchip iomd_a_chip = {
+ .ack = iomd_ack_irq_a,
+ .mask = iomd_mask_irq_a,
+ .unmask = iomd_unmask_irq_a,
+};
+
+static void iomd_mask_irq_b(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_IRQMASKB);
+ iomd_writeb(val & ~mask, IOMD_IRQMASKB);
+}
+
+static void iomd_unmask_irq_b(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_IRQMASKB);
+ iomd_writeb(val | mask, IOMD_IRQMASKB);
+}
+
+static struct irqchip iomd_b_chip = {
+ .ack = iomd_mask_irq_b,
+ .mask = iomd_mask_irq_b,
+ .unmask = iomd_unmask_irq_b,
+};
+
+static void iomd_mask_irq_dma(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_DMAMASK);
+ iomd_writeb(val & ~mask, IOMD_DMAMASK);
+}
+
+static void iomd_unmask_irq_dma(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_DMAMASK);
+ iomd_writeb(val | mask, IOMD_DMAMASK);
+}
+
+static struct irqchip iomd_dma_chip = {
+ .ack = iomd_mask_irq_dma,
+ .mask = iomd_mask_irq_dma,
+ .unmask = iomd_unmask_irq_dma,
+};
+
+static void iomd_mask_irq_fiq(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_FIQMASK);
+ iomd_writeb(val & ~mask, IOMD_FIQMASK);
+}
+
+static void iomd_unmask_irq_fiq(unsigned int irq)
+{
+ unsigned int val, mask;
+
+ mask = 1 << (irq & 7);
+ val = iomd_readb(IOMD_FIQMASK);
+ iomd_writeb(val | mask, IOMD_FIQMASK);
+}
+
+static struct irqchip iomd_fiq_chip = {
+ .ack = iomd_mask_irq_fiq,
+ .mask = iomd_mask_irq_fiq,
+ .unmask = iomd_unmask_irq_fiq,
+};
+
+void __init rpc_init_irq(void)
+{
+ unsigned int irq, flags;
+
+ iomd_writeb(0, IOMD_IRQMASKA);
+ iomd_writeb(0, IOMD_IRQMASKB);
+ iomd_writeb(0, IOMD_FIQMASK);
+ iomd_writeb(0, IOMD_DMAMASK);
+
+ for (irq = 0; irq < NR_IRQS; irq++) {
+ flags = IRQF_VALID;
+
+ if (irq <= 6 || (irq >= 9 && irq <= 15))
+ flags |= IRQF_PROBE;
+
+ if (irq == 21 || (irq >= 16 && irq <= 19) ||
+ irq == IRQ_KEYBOARDTX)
+ flags |= IRQF_NOAUTOEN;
+
+ switch (irq) {
+ case 0 ... 7:
+ set_irq_chip(irq, &iomd_a_chip);
+ set_irq_handler(irq, do_level_IRQ);
+ set_irq_flags(irq, flags);
+ break;
+
+ case 8 ... 15:
+ set_irq_chip(irq, &iomd_b_chip);
+ set_irq_handler(irq, do_level_IRQ);
+ set_irq_flags(irq, flags);
+ break;
+
+ case 16 ... 21:
+ set_irq_chip(irq, &iomd_dma_chip);
+ set_irq_handler(irq, do_level_IRQ);
+ set_irq_flags(irq, flags);
+ break;
+
+ case 64 ... 71:
+ set_irq_chip(irq, &iomd_fiq_chip);
+ set_irq_flags(irq, IRQF_VALID);
+ break;
+ }
+ }
+
+ init_FIQ();
+}
+