ARM: integrator/versatile: consolidate FPGA IRQ handling code
Consolidate the FPGA IRQ handling code. Integrator/AP and Versatile
have one FPGA-based IRQ handler each. Integrator/CP has three.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/plat-versatile/Kconfig b/arch/arm/plat-versatile/Kconfig
index c5e2cd0..0b27500 100644
--- a/arch/arm/plat-versatile/Kconfig
+++ b/arch/arm/plat-versatile/Kconfig
@@ -3,6 +3,9 @@
config PLAT_VERSATILE_CLCD
bool
+config PLAT_VERSATILE_FPGA_IRQ
+ bool
+
config PLAT_VERSATILE_LEDS
def_bool y if LEDS_CLASS
depends on ARCH_REALVIEW || ARCH_VERSATILE
diff --git a/arch/arm/plat-versatile/Makefile b/arch/arm/plat-versatile/Makefile
index de6f42f..41f57f4 100644
--- a/arch/arm/plat-versatile/Makefile
+++ b/arch/arm/plat-versatile/Makefile
@@ -1,5 +1,6 @@
obj-y := clock.o
obj-$(CONFIG_PLAT_VERSATILE_CLCD) += clcd.o
+obj-$(CONFIG_PLAT_VERSATILE_FPGA_IRQ) += fpga-irq.o
obj-$(CONFIG_PLAT_VERSATILE_LEDS) += leds.o
obj-$(CONFIG_PLAT_VERSATILE_SCHED_CLOCK) += sched-clock.o
diff --git a/arch/arm/plat-versatile/fpga-irq.c b/arch/arm/plat-versatile/fpga-irq.c
new file mode 100644
index 0000000..31d945d
--- /dev/null
+++ b/arch/arm/plat-versatile/fpga-irq.c
@@ -0,0 +1,72 @@
+/*
+ * Support for Versatile FPGA-based IRQ controllers
+ */
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <asm/mach/irq.h>
+#include <plat/fpga-irq.h>
+
+#define IRQ_STATUS 0x00
+#define IRQ_RAW_STATUS 0x04
+#define IRQ_ENABLE_SET 0x08
+#define IRQ_ENABLE_CLEAR 0x0c
+
+static void fpga_irq_mask(struct irq_data *d)
+{
+ struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
+ u32 mask = 1 << (d->irq - f->irq_start);
+
+ writel(mask, f->base + IRQ_ENABLE_CLEAR);
+}
+
+static void fpga_irq_unmask(struct irq_data *d)
+{
+ struct fpga_irq_data *f = irq_data_get_irq_chip_data(d);
+ u32 mask = 1 << (d->irq - f->irq_start);
+
+ writel(mask, f->base + IRQ_ENABLE_SET);
+}
+
+static void fpga_irq_handle(unsigned int irq, struct irq_desc *desc)
+{
+ struct fpga_irq_data *f = get_irq_desc_data(desc);
+ u32 status = readl(f->base + IRQ_STATUS);
+
+ if (status == 0) {
+ do_bad_IRQ(irq, desc);
+ return;
+ }
+
+ do {
+ irq = ffs(status) - 1;
+ status &= ~(1 << irq);
+
+ generic_handle_irq(irq + f->irq_start);
+ } while (status);
+}
+
+void __init fpga_irq_init(int parent_irq, u32 valid, struct fpga_irq_data *f)
+{
+ unsigned int i;
+
+ f->chip.irq_ack = fpga_irq_mask;
+ f->chip.irq_mask = fpga_irq_mask;
+ f->chip.irq_unmask = fpga_irq_unmask;
+
+ if (parent_irq != -1) {
+ set_irq_data(parent_irq, f);
+ set_irq_chained_handler(parent_irq, fpga_irq_handle);
+ }
+
+ for (i = 0; i < 32; i++) {
+ if (valid & (1 << i)) {
+ unsigned int irq = f->irq_start + i;
+
+ set_irq_chip_data(irq, f);
+ set_irq_chip(irq, &f->chip);
+ set_irq_handler(irq, handle_level_irq);
+ set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+ }
+ }
+}
diff --git a/arch/arm/plat-versatile/include/plat/fpga-irq.h b/arch/arm/plat-versatile/include/plat/fpga-irq.h
new file mode 100644
index 0000000..627fafd
--- /dev/null
+++ b/arch/arm/plat-versatile/include/plat/fpga-irq.h
@@ -0,0 +1,12 @@
+#ifndef PLAT_FPGA_IRQ_H
+#define PLAT_FPGA_IRQ_H
+
+struct fpga_irq_data {
+ void __iomem *base;
+ unsigned int irq_start;
+ struct irq_chip chip;
+};
+
+void fpga_irq_init(int, u32, struct fpga_irq_data *);
+
+#endif