[PATCH 1/2] hw/cxl: Add utility functions decoder interleave ways and target count.

[Jonathan Cameron <Jonathan.Cameron@huawei.com>]

As an encoded version of these key configuration parameters is
a register, provide functions to extract it again so as to avoid
the need for duplicating the storage.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
 include/hw/cxl/cxl_component.h | 14 ++++++++++++++
 hw/cxl/cxl-component-utils.c   | 17 +++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/include/hw/cxl/cxl_component.h b/include/hw/cxl/cxl_component.h
index 42c7e581a7..f0ad9cf7de 100644
--- a/include/hw/cxl/cxl_component.h
+++ b/include/hw/cxl/cxl_component.h
@@ -238,7 +238,21 @@ static inline int cxl_decoder_count_enc(int count)
     return 0;
 }
 
+static inline int cxl_decoder_count_dec(int enc_cnt)
+{
+    switch (enc_cnt) {
+    case 0: return 1;
+    case 1: return 2;
+    case 2: return 4;
+    case 3: return 6;
+    case 4: return 8;
+    case 5: return 10;
+    }
+    return 0;
+}
+
 uint8_t cxl_interleave_ways_enc(int iw, Error **errp);
+int cxl_interleave_ways_dec(uint8_t iw_enc, Error **errp);
 uint8_t cxl_interleave_granularity_enc(uint64_t gran, Error **errp);
 
 static inline hwaddr cxl_decode_ig(int ig)
diff --git a/hw/cxl/cxl-component-utils.c b/hw/cxl/cxl-component-utils.c
index 378f1082ce..e96398e8af 100644
--- a/hw/cxl/cxl-component-utils.c
+++ b/hw/cxl/cxl-component-utils.c
@@ -392,6 +392,23 @@ uint8_t cxl_interleave_ways_enc(int iw, Error **errp)
     }
 }
 
+int cxl_interleave_ways_dec(uint8_t iw_enc, Error **errp)
+{
+    switch (iw_enc) {
+    case 0x0: return 1;
+    case 0x1: return 2;
+    case 0x2: return 4;
+    case 0x3: return 8;
+    case 0x4: return 16;
+    case 0x8: return 3;
+    case 0x9: return 6;
+    case 0xa: return 12;
+    default:
+        error_setg(errp, "Encoded interleave ways: %d not supported", iw_enc);
+        return 0;
+    }
+}
+
 uint8_t cxl_interleave_granularity_enc(uint64_t gran, Error **errp)
 {
     switch (gran) {
-- 
2.39.2