From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
We treat SSKPD as a 64 bit register. Add the support macros
to define/extract bits in such registers.
v2: Fix 32bit builds
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_reg_defs.h | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg_defs.h b/drivers/gpu/drm/i915/i915_reg_defs.h
index 34d37bbf08cd..d78d78fce431 100644
--- a/drivers/gpu/drm/i915/i915_reg_defs.h
+++ b/drivers/gpu/drm/i915/i915_reg_defs.h
@@ -37,6 +37,21 @@
__is_constexpr(__low) && \
((__low) < 0 || (__high) > 31 || (__low) > (__high)))))
+/**
+ * REG_GENMASK64() - Prepare a continuous u64 bitmask
+ * @__high: 0-based high bit
+ * @__low: 0-based low bit
+ *
+ * Local wrapper for GENMASK_ULL() to force u64, with compile time checks.
+ *
+ * @return: Continuous bitmask from @__high to @__low, inclusive.
+ */
+#define REG_GENMASK64(__high, __low) \
+ ((u64)(GENMASK_ULL(__high, __low) + \
+ BUILD_BUG_ON_ZERO(__is_constexpr(__high) && \
+ __is_constexpr(__low) && \
+ ((__low) < 0 || (__high) > 63 || (__low) > (__high)))))
+
/*
* Local integer constant expression version of is_power_of_2().
*/
@@ -71,6 +86,18 @@
*/
#define REG_FIELD_GET(__mask, __val) ((u32)FIELD_GET(__mask, __val))
+/**
+ * REG_FIELD_GET64() - Extract a u64 bitfield value
+ * @__mask: shifted mask defining the field's length and position
+ * @__val: value to extract the bitfield value from
+ *
+ * Local wrapper for FIELD_GET() to force u64 and for consistency with
+ * REG_GENMASK64().
+ *
+ * @return: Masked and shifted value of the field defined by @__mask in @__val.
+ */
+#define REG_FIELD_GET64(__mask, __val) ((u64)FIELD_GET(__mask, __val))
+
typedef struct {
u32 reg;
} i915_reg_t;
--
2.34.1
