vas: Define vas_get_wcbs_bar interface

Implement the function vas_get_wcbs_bar() that returns the Window
Context Backing store address register. NX driver uses this function
to initialize its UMAC Send WC register.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/core/vas.c b/core/vas.c
index 988662c..a00dc26 100644
--- a/core/vas.c
+++ b/core/vas.c
@@ -82,6 +82,21 @@ __attrconst inline uint64_t vas_get_hvwc_mmio_bar(const int chipid)
 	return addr;
 }
 
+/* Interface for NX - make sure VAS is fully initialized first */
+__attrconst uint64_t vas_get_wcbs_bar(int chipid)
+{
+	struct proc_chip *chip;
+
+	if (!vas_initialized)
+		return 0ULL;
+
+	chip = get_chip(chipid);
+	if (!chip)
+		return 0ULL;
+
+	return chip->vas->wcbs;
+}
+
 static int init_north_ctl(struct proc_chip *chip)
 {
 	uint64_t val = 0ULL;