[RFC PATCH 1/6] cxl/core: Add CXL Timeout & Isolation capability parsing

[Ben Cheatham <Benjamin.Cheatham@amd.com>]

Add parsing and mapping of the CXL Timeout & Isolation capability
structure (CXL 3.1 8.2.4.24) to regs.c.

Signed-off-by: Ben Cheatham <Benjamin.Cheatham@amd.com>
---
 drivers/cxl/core/regs.c | 7 +++++++
 drivers/cxl/cxl.h       | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
index 372786f80955..fe0c19826a6a 100644
--- a/drivers/cxl/core/regs.c
+++ b/drivers/cxl/core/regs.c
@@ -92,6 +92,12 @@ void cxl_probe_component_regs(struct device *dev, void __iomem *base,
 			length = CXL_RAS_CAPABILITY_LENGTH;
 			rmap = &map->ras;
 			break;
+		case CXL_CM_CAP_CAP_ID_TIMEOUT:
+			dev_dbg(dev, "found Isolation & Timeout capability (0x%x)\n",
+				offset);
+			length = CXL_TIMEOUT_CAPABILITY_LENGTH;
+			rmap = &map->timeout;
+			break;
 		default:
 			dev_dbg(dev, "Unknown CM cap ID: %d (0x%x)\n", cap_id,
 				offset);
@@ -211,6 +217,7 @@ int cxl_map_component_regs(const struct cxl_register_map *map,
 	} mapinfo[] = {
 		{ &map->component_map.hdm_decoder, &regs->hdm_decoder },
 		{ &map->component_map.ras, &regs->ras },
+		{ &map->component_map.timeout, &regs->timeout },
 	};
 	int i;
 
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index b6017c0c57b4..87f3178d6642 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -36,6 +36,7 @@
 
 #define   CXL_CM_CAP_CAP_ID_RAS 0x2
 #define   CXL_CM_CAP_CAP_ID_HDM 0x5
+#define   CXL_CM_CAP_CAP_ID_TIMEOUT 0x9
 #define   CXL_CM_CAP_CAP_HDM_VERSION 1
 
 /* HDM decoders CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure */
@@ -126,6 +127,9 @@ static inline int ways_to_eiw(unsigned int ways, u8 *eiw)
 	return 0;
 }
 
+/* CXL 3.0 8.2.4.23 CXL Timeout and Isolation Capability Structure */
+#define CXL_TIMEOUT_CAPABILITY_OFFSET 0x0
+#define CXL_TIMEOUT_CAPABILITY_LENGTH 0x10
 /* RAS Registers CXL 2.0 8.2.5.9 CXL RAS Capability Structure */
 #define CXL_RAS_UNCORRECTABLE_STATUS_OFFSET 0x0
 #define   CXL_RAS_UNCORRECTABLE_STATUS_MASK (GENMASK(16, 14) | GENMASK(11, 0))
@@ -208,6 +212,7 @@ struct cxl_regs {
 	struct_group_tagged(cxl_component_regs, component,
 		void __iomem *hdm_decoder;
 		void __iomem *ras;
+		void __iomem *timeout;
 	);
 	/*
 	 * Common set of CXL Device register block base pointers
@@ -242,6 +247,7 @@ struct cxl_reg_map {
 struct cxl_component_reg_map {
 	struct cxl_reg_map hdm_decoder;
 	struct cxl_reg_map ras;
+	struct cxl_reg_map timeout;
 };
 
 struct cxl_device_reg_map {
-- 
2.34.1