[Intel-gfx] [PATCH v2 1/2] drm/i915: Add 16bit register/mask operators

[Clint Taylor]

Add the support macros to define/extract bits as 16bits.

v2: checkpatch fixes
Reviewed-by: Gustavo Sousa <gustavo.sousa at intel.com>
Signed-off-by: Clint Taylor <clinton.a.taylor at intel.com>
---
 drivers/gpu/drm/i915/i915_reg_defs.h | 48 ++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg_defs.h b/drivers/gpu/drm/i915/i915_reg_defs.h
index 622d603080f9..a685db1e815d 100644
--- a/drivers/gpu/drm/i915/i915_reg_defs.h
+++ b/drivers/gpu/drm/i915/i915_reg_defs.h
@@ -143,6 +143,54 @@
  */
 #define REG_FIELD_GET64(__mask, __val)	((u64)FIELD_GET(__mask, __val))
 
+/**
+ * REG_BIT16() - Prepare a u16 bit value
+ * @__n: 0-based bit number
+ *
+ * Local wrapper for BIT() to force u16, with compile time
+ * checks.
+ *
+ * @return: Value with bit @__n set.
+ */
+#define REG_BIT16(__n)                                                   \
+	((u16)(BIT(__n) +                                                \
+	       BUILD_BUG_ON_ZERO(__is_constexpr(__n) &&         \
+				 ((__n) < 0 || (__n) > 15))))
+
+/**
+ * REG_GENMASK16() - Prepare a continuous u8 bitmask
+ * @__high: 0-based high bit
+ * @__low: 0-based low bit
+ *
+ * Local wrapper for GENMASK() to force u16, with compile time
+ * checks.
+ *
+ * @return: Continuous bitmask from @__high to @__low, inclusive.
+ */
+#define REG_GENMASK16(__high, __low)                                     \
+	((u16)(GENMASK(__high, __low) +                                  \
+	       BUILD_BUG_ON_ZERO(__is_constexpr(__high) &&      \
+				 __is_constexpr(__low) &&               \
+				 ((__low) < 0 || (__high) > 15 || (__low) > (__high)))))
+
+/**
+ * REG_FIELD_PREP16() - Prepare a u16 bitfield value
+ * @__mask: shifted mask defining the field's length and position
+ * @__val: value to put in the field
+ *
+ * Local copy of FIELD_PREP16() to generate an integer constant
+ * expression, force u8 and for consistency with
+ * REG_FIELD_GET16(), REG_BIT16() and REG_GENMASK16().
+ *
+ * @return: @__val masked and shifted into the field defined by @__mask.
+ */
+#define REG_FIELD_PREP16(__mask, __val)                                          \
+	((u16)((((typeof(__mask))(__val) << __bf_shf(__mask)) & (__mask)) +      \
+	       BUILD_BUG_ON_ZERO(!__is_constexpr(__mask)) +             \
+	       BUILD_BUG_ON_ZERO((__mask) == 0 || (__mask) > U16_MAX) +          \
+	       BUILD_BUG_ON_ZERO(!IS_POWER_OF_2((__mask) + (1ULL << __bf_shf(__mask)))) + \
+	       BUILD_BUG_ON_ZERO(__builtin_choose_expr(__is_constexpr(__val), (~((__mask) >> __bf_shf(__mask)) & (__val)), 0))))
+
 #define __MASKED_FIELD(mask, value) ((mask) << 16 | (value))
 #define _MASKED_FIELD(mask, value) ({					   \
 	if (__builtin_constant_p(mask))					   \
-- 
2.25.1