1 files changed, 67 insertions, 0 deletions
diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
new file mode 100644
index 0000000..e5c9160
--- /dev/null
+++ b/arch/x86/include/asm/irq.h
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ */
+
+#ifndef _ARCH_IRQ_H_
+#define _ARCH_IRQ_H_
+
+#include <dt-bindings/interrupt-router/intel-irq.h>
+
+/**
+ * Intel interrupt router configuration mechanism
+ *
+ * There are two known ways of Intel interrupt router configuration mechanism
+ * so far. On most cases, the IRQ routing configuraiton is controlled by PCI
+ * configuraiton registers on the legacy bridge, normally PCI BDF(0, 31, 0).
+ * On some newer platforms like BayTrail and Braswell, the IRQ routing is now
+ * in the IBASE register block where IBASE is memory-mapped.
+ */
+enum pirq_config {
+	PIRQ_VIA_PCI,
+	PIRQ_VIA_IBASE
+};
+
+struct pirq_regmap {
+	int link;
+	int offset;
+};
+
+/**
+ * Intel interrupt router control block
+ *
+ * Its members' value will be filled in based on device tree's input.
+ *
+ * @config:	PIRQ_VIA_PCI or PIRQ_VIA_IBASE
+ * @link_base:	link value base number
+ * @link_num:	number of PIRQ links supported
+ * @has_regmap:	has mapping table between PIRQ link and routing register offset
+ * @irq_mask:	IRQ mask reprenting the 16 IRQs in 8259, bit N is 1 means
+ *		IRQ N is available to be routed
+ * @lb_bdf:	irq router's PCI bus/device/function number encoding
+ * @ibase:	IBASE register block base address
+ * @actl_8bit:	ACTL register width is 8-bit (for ICH series chipset)
+ * @actl_addr:	ACTL register offset
+ */
+struct irq_router {
+	int config;
+	u32 link_base;
+	int link_num;
+	bool has_regmap;
+	struct pirq_regmap *regmap;
+	u16 irq_mask;
+	u32 bdf;
+	u32 ibase;
+	bool actl_8bit;
+	int actl_addr;
+};
+
+struct pirq_routing {
+	int bdf;
+	int pin;
+	int pirq;
+};
+
+#define PIRQ_BITMAP		0xdef8
+
+#endif /* _ARCH_IRQ_H_ */