1 files changed, 131 insertions, 0 deletions
diff --git a/arch/arm/mach-rpc/irq.c b/arch/arm/mach-rpc/irq.c
new file mode 100644
index 000000000..803aeb126
--- /dev/null
+++ b/arch/arm/mach-rpc/irq.c
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/io.h>
+
+#include <asm/mach/irq.h>
+#include <asm/hardware/iomd.h>
+#include <asm/irq.h>
+#include <asm/fiq.h>
+
+// These are offsets from the stat register for each IRQ bank
+#define STAT	0x00
+#define REQ	0x04
+#define CLR	0x04
+#define MASK	0x08
+
+static void __iomem *iomd_get_base(struct irq_data *d)
+{
+	void *cd = irq_data_get_irq_chip_data(d);
+
+	return (void __iomem *)(unsigned long)cd;
+}
+
+static void iomd_set_base_mask(unsigned int irq, void __iomem *base, u32 mask)
+{
+	struct irq_data *d = irq_get_irq_data(irq);
+
+	d->mask = mask;
+	irq_set_chip_data(irq, (void *)(unsigned long)base);
+}
+
+static void iomd_irq_mask_ack(struct irq_data *d)
+{
+	void __iomem *base = iomd_get_base(d);
+	unsigned int val, mask = d->mask;
+
+	val = readb(base + MASK);
+	writeb(val & ~mask, base + MASK);
+	writeb(mask, base + CLR);
+}
+
+static void iomd_irq_mask(struct irq_data *d)
+{
+	void __iomem *base = iomd_get_base(d);
+	unsigned int val, mask = d->mask;
+
+	val = readb(base + MASK);
+	writeb(val & ~mask, base + MASK);
+}
+
+static void iomd_irq_unmask(struct irq_data *d)
+{
+	void __iomem *base = iomd_get_base(d);
+	unsigned int val, mask = d->mask;
+
+	val = readb(base + MASK);
+	writeb(val | mask, base + MASK);
+}
+
+static struct irq_chip iomd_chip_clr = {
+	.irq_mask_ack	= iomd_irq_mask_ack,
+	.irq_mask	= iomd_irq_mask,
+	.irq_unmask	= iomd_irq_unmask,
+};
+
+static struct irq_chip iomd_chip_noclr = {
+	.irq_mask	= iomd_irq_mask,
+	.irq_unmask	= iomd_irq_unmask,
+};
+
+extern unsigned char rpc_default_fiq_start, rpc_default_fiq_end;
+
+void __init rpc_init_irq(void)
+{
+	unsigned int irq, clr, set;
+
+	iomd_writeb(0, IOMD_IRQMASKA);
+	iomd_writeb(0, IOMD_IRQMASKB);
+	iomd_writeb(0, IOMD_FIQMASK);
+	iomd_writeb(0, IOMD_DMAMASK);
+
+	set_fiq_handler(&rpc_default_fiq_start,
+		&rpc_default_fiq_end - &rpc_default_fiq_start);
+
+	for (irq = 0; irq < NR_IRQS; irq++) {
+		clr = IRQ_NOREQUEST;
+		set = 0;
+
+		if (irq <= 6 || (irq >= 9 && irq <= 15))
+			clr |= IRQ_NOPROBE;
+
+		if (irq == 21 || (irq >= 16 && irq <= 19) ||
+		    irq == IRQ_KEYBOARDTX)
+			set |= IRQ_NOAUTOEN;
+
+		switch (irq) {
+		case 0 ... 7:
+			irq_set_chip_and_handler(irq, &iomd_chip_clr,
+						 handle_level_irq);
+			irq_modify_status(irq, clr, set);
+			iomd_set_base_mask(irq, IOMD_BASE + IOMD_IRQSTATA,
+					   BIT(irq));
+			break;
+
+		case 8 ... 15:
+			irq_set_chip_and_handler(irq, &iomd_chip_noclr,
+						 handle_level_irq);
+			irq_modify_status(irq, clr, set);
+			iomd_set_base_mask(irq, IOMD_BASE + IOMD_IRQSTATB,
+					   BIT(irq - 8));
+			break;
+
+		case 16 ... 21:
+			irq_set_chip_and_handler(irq, &iomd_chip_noclr,
+						 handle_level_irq);
+			irq_modify_status(irq, clr, set);
+			iomd_set_base_mask(irq, IOMD_BASE + IOMD_DMASTAT,
+					   BIT(irq - 16));
+			break;
+
+		case 64 ... 71:
+			irq_set_chip(irq, &iomd_chip_noclr);
+			irq_modify_status(irq, clr, set);
+			iomd_set_base_mask(irq, IOMD_BASE + IOMD_FIQSTAT,
+					   BIT(irq - 64));
+			break;
+		}
+	}
+
+	init_FIQ(FIQ_START);
+}