[U-Boot] [PATCH 12/13] x86: ivybridge: Implement IvyBridge-specific IRQ converting logic

[Bin Meng]

This adds pirq_reg_to_linkno() and pirq_linkno_to_reg() for IvyBridge.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
---

 arch/x86/cpu/ivybridge/Kconfig            |  4 +++
 arch/x86/include/asm/arch-ivybridge/irq.h | 45 +++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 arch/x86/include/asm/arch-ivybridge/irq.h

diff --git a/arch/x86/cpu/ivybridge/Kconfig b/arch/x86/cpu/ivybridge/Kconfig
index eec92df..e31c33c 100644
--- a/arch/x86/cpu/ivybridge/Kconfig
+++ b/arch/x86/cpu/ivybridge/Kconfig
@@ -58,6 +58,10 @@ config ENABLE_VMX
 	  will be unable to support virtualisation, or it will run very
 	  slowly.
 
+config DISCRETE_PIRQ_ROUT
+	bool
+	default y
+
 config FSP_ADDR
 	hex
 	default 0xfff80000
diff --git a/arch/x86/include/asm/arch-ivybridge/irq.h b/arch/x86/include/asm/arch-ivybridge/irq.h
new file mode 100644
index 0000000..d8ddf55
--- /dev/null
+++ b/arch/x86/include/asm/arch-ivybridge/irq.h
@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018, Bin Meng <bmeng.cn at gmail.com>
+ *
+ * IvyBridge specific IRQ converting logic
+ */
+
+#ifndef _IVYBRIDGE_IRQ_H_
+#define _IVYBRIDGE_IRQ_H_
+
+/**
+ * pirq_reg_to_linkno() - Convert a PIRQ routing register offset to link number
+ *
+ * @reg:	PIRQ routing register offset from the base address
+ * @base:	PIRQ routing register block base address
+ * @return:	PIRQ link number (0 for PIRQA, 1 for PIRQB, etc)
+ */
+static inline int pirq_reg_to_linkno(int reg, int base)
+{
+	int linkno = reg - base;
+
+	if (linkno > PIRQH)
+		linkno -= 4;
+
+	return linkno;
+}
+
+/**
+ * pirq_linkno_to_reg() - Convert a PIRQ link number to routing register offset
+ *
+ * @linkno:	PIRQ link number (0 for PIRQA, 1 for PIRQB, etc)
+ * @base:	PIRQ routing register block base address
+ * @return:	PIRQ routing register offset from the base address
+ */
+static inline int pirq_linkno_to_reg(int linkno, int base)
+{
+	int reg = linkno + base;
+
+	if (linkno > PIRQD)
+		reg += 4;
+
+	return reg;
+}
+
+#endif /* _IVYBRIDGE_IRQ_H_ */
-- 
2.7.4