linux-kernel - [PATCH v2 2/3] RISC-V: Add interrupt related SCAUSE defines in asm/encoding.h

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Date:   Sat, 13 Apr 2019 15:38:39 +0000
From:   Anup Patel <Anup.Patel@....com>
To:     Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>
CC:     Atish Patra <Atish.Patra@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Christoph Hellwig <hch@...radead.org>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Anup Patel <Anup.Patel@....com>
Subject: [PATCH v2 2/3] RISC-V: Add interrupt related SCAUSE defines in
 asm/encoding.h

This patch adds SCAUSE interrupt flag and SCAUSE interrupt cause
related defines to asm/encoding.h. We also use these defines in
arch/riscv/kernel/irq.c and express SIE/SIP flag in-terms of
interrupt causes.

Signed-off-by: Anup Patel <anup.patel@....com>
---
 arch/riscv/include/asm/encoding.h | 25 +++++++++++++++++++++----
 arch/riscv/kernel/irq.c           |  9 +++++----
 2 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/arch/riscv/include/asm/encoding.h b/arch/riscv/include/asm/encoding.h
index 29699705dc36..4f187854fd8b 100644
--- a/arch/riscv/include/asm/encoding.h
+++ b/arch/riscv/include/asm/encoding.h
@@ -44,10 +44,22 @@
 #define SATP_MODE	SATP_MODE_39
 #endif
 
-/* Interrupt Enable and Interrupt Pending flags */
-#define SIE_SSIE	_AC(0x00000002, UL) /* Software Interrupt Enable */
-#define SIE_STIE	_AC(0x00000020, UL) /* Timer Interrupt Enable */
-#define SIE_SEIE	_AC(0x00000200, UL) /* External Interrupt Enable */
+/* SCAUSE */
+#ifdef CONFIG_64BIT
+#define SCAUSE_IRQ_FLAG		_AC(0x8000000000000000, UL)
+#else
+#define SCAUSE_IRQ_FLAG		_AC(0x80000000, UL)
+#endif
+
+#define IRQ_U_SOFT		0
+#define IRQ_S_SOFT		1
+#define IRQ_M_SOFT		3
+#define IRQ_U_TIMER		4
+#define IRQ_S_TIMER		5
+#define IRQ_M_TIMER		7
+#define IRQ_U_EXT		8
+#define IRQ_S_EXT		9
+#define IRQ_M_EXT		11
 
 #define EXC_INST_MISALIGNED	0
 #define EXC_INST_ACCESS		1
@@ -59,4 +71,9 @@
 #define EXC_LOAD_PAGE_FAULT	13
 #define EXC_STORE_PAGE_FAULT	15
 
+/* SIE (Interrupt Enable) and SIP (Interrupt Pending) flags */
+#define SIE_SSIE		(_AC(0x1, UL) << IRQ_S_SOFT)
+#define SIE_STIE		(_AC(0x1, UL) << IRQ_S_TIMER)
+#define SIE_SEIE		(_AC(0x1, UL) << IRQ_S_EXT)
+
 #endif /* _ASM_RISCV_ENCODING_H */
diff --git a/arch/riscv/kernel/irq.c b/arch/riscv/kernel/irq.c
index 48e6b7db83a1..22b8183ae8d4 100644
--- a/arch/riscv/kernel/irq.c
+++ b/arch/riscv/kernel/irq.c
@@ -9,14 +9,15 @@
 #include <linux/irqchip.h>
 #include <linux/irqdomain.h>
 #include <linux/seq_file.h>
+#include <asm/encoding.h>
 #include <asm/smp.h>
 
 /*
  * Possible interrupt causes:
  */
-#define INTERRUPT_CAUSE_SOFTWARE    1
-#define INTERRUPT_CAUSE_TIMER       5
-#define INTERRUPT_CAUSE_EXTERNAL    9
+#define INTERRUPT_CAUSE_SOFTWARE	IRQ_S_SOFT
+#define INTERRUPT_CAUSE_TIMER		IRQ_S_TIMER
+#define INTERRUPT_CAUSE_EXTERNAL	IRQ_S_EXT
 
 /*
  * The high order bit of the trap cause register is always set for
@@ -24,7 +25,7 @@
  * quickly.  The INTERRUPT_CAUSE_* macros don't contain that bit, so we
  * need to mask it off.
  */
-#define INTERRUPT_CAUSE_FLAG	(1UL << (__riscv_xlen - 1))
+#define INTERRUPT_CAUSE_FLAG		SCAUSE_IRQ_FLAG
 
 int arch_show_interrupts(struct seq_file *p, int prec)
 {
-- 
2.17.1