[Skiboot] [PATCH 5/9] phb4: Add register access helpers

[Benjamin Herrenschmidt]

Those will pick between ASB (ie, XSCOM) accesses and direct MMIO
based on PHB flags, thus allowing transparent access whether the
PHB is fenced or not.

Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
---
 hw/phb4.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/hw/phb4.c b/hw/phb4.c
index 30122ed..03b357d 100644
--- a/hw/phb4.c
+++ b/hw/phb4.c
@@ -155,6 +155,22 @@ static inline void phb4_write_reg_asb(struct phb4 *p,
 #endif
 }
 
+static uint64_t phb4_read_reg(struct phb4 *p, uint32_t offset)
+{
+	if (p->flags & PHB4_CFG_USE_ASB)
+		return phb4_read_reg_asb(p, offset);
+	else
+		return in_be64(p->regs + offset);
+}
+
+static void phb4_write_reg(struct phb4 *p, uint32_t offset, uint64_t val)
+{
+	if (p->flags & PHB4_CFG_USE_ASB)
+		phb4_write_reg_asb(p, offset, val);
+	else
+		return out_be64(p->regs + offset, val);
+}
+
 /* Helper to select an IODA table entry */
 static inline void phb4_ioda_sel(struct phb4 *p, uint32_t table,
 				 uint32_t addr, bool autoinc)
-- 
2.9.4