[PATCH 03/38] MIPS: SGI-IP27: add REMOTE_HUB_PI_S()/REMOTE_HUB_PI_L()

[Imre Kaloz]

Some hub generations split each hub's PI registers across two
subnode blocks instead of one, so a remote access needs a subnode
selector on top of REMOTE_HUB_ADDR()'s node selector. Passing
subnode 0 reduces the new form to plain REMOTE_HUB_L()/REMOTE_HUB_S().

Signed-off-by: Imre Kaloz <kaloz@xxxxxxxxxx>
---
 arch/mips/include/asm/sn/addrs.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/arch/mips/include/asm/sn/addrs.h b/arch/mips/include/asm/sn/addrs.h
index 7c675fecbf9a..d5c7cfea7761 100644
--- a/arch/mips/include/asm/sn/addrs.h
+++ b/arch/mips/include/asm/sn/addrs.h
@@ -267,6 +267,27 @@
 
 #endif /* !__ASSEMBLER__ */
 
+/*
+ * Some hub generations split each hub's PI registers across two subnode
+ * blocks HUBPI_OFFSET apart; REMOTE_HUB_ADDR() always targets subnode 0.
+ */
+#define HUBPI_OFFSET		0x00200000
+
+#define REMOTE_HUB_PI_ADDR(_n, _sn, _x) \
+	(REMOTE_HUB_ADDR((_n), (_x)) + ((_sn) ? HUBPI_OFFSET : 0))
+
+#ifndef __ASSEMBLER__
+
+#define REMOTE_HUB_PI_PTR(_n, _sn, _x)	\
+	((u64 *)REMOTE_HUB_PI_ADDR((_n), (_sn), (_x)))
+
+#define REMOTE_HUB_PI_L(_n, _sn, _r)		\
+	__raw_readq(REMOTE_HUB_PI_PTR((_n), (_sn), (_r)))
+#define REMOTE_HUB_PI_S(_n, _sn, _r, _d)	\
+	__raw_writeq((_d), REMOTE_HUB_PI_PTR((_n), (_sn), (_r)))
+
+#endif /* !__ASSEMBLER__ */
+
 /*
  * Software structure locations -- permanently fixed
  *    See diagram in kldir.h
-- 
2.47.3