1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_fixed.h b/drivers/gpu/drm/i915/i915_fixed.h
new file mode 100644
index 000000000..a327094de
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_fixed.h
@@ -0,0 +1,148 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2018 Intel Corporation
+ */
+
+#ifndef _I915_FIXED_H_
+#define _I915_FIXED_H_
+
+#include <linux/bug.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/types.h>
+
+typedef struct {
+	u32 val;
+} uint_fixed_16_16_t;
+
+#define FP_16_16_MAX ((uint_fixed_16_16_t){ .val = UINT_MAX })
+
+static inline bool is_fixed16_zero(uint_fixed_16_16_t val)
+{
+	return val.val == 0;
+}
+
+static inline uint_fixed_16_16_t u32_to_fixed16(u32 val)
+{
+	uint_fixed_16_16_t fp = { .val = val << 16 };
+
+	WARN_ON(val > U16_MAX);
+
+	return fp;
+}
+
+static inline u32 fixed16_to_u32_round_up(uint_fixed_16_16_t fp)
+{
+	return DIV_ROUND_UP(fp.val, 1 << 16);
+}
+
+static inline u32 fixed16_to_u32(uint_fixed_16_16_t fp)
+{
+	return fp.val >> 16;
+}
+
+static inline uint_fixed_16_16_t min_fixed16(uint_fixed_16_16_t min1,
+					     uint_fixed_16_16_t min2)
+{
+	uint_fixed_16_16_t min = { .val = min(min1.val, min2.val) };
+
+	return min;
+}
+
+static inline uint_fixed_16_16_t max_fixed16(uint_fixed_16_16_t max1,
+					     uint_fixed_16_16_t max2)
+{
+	uint_fixed_16_16_t max = { .val = max(max1.val, max2.val) };
+
+	return max;
+}
+
+static inline uint_fixed_16_16_t clamp_u64_to_fixed16(u64 val)
+{
+	uint_fixed_16_16_t fp = { .val = (u32)val };
+
+	WARN_ON(val > U32_MAX);
+
+	return fp;
+}
+
+static inline u32 div_round_up_fixed16(uint_fixed_16_16_t val,
+				       uint_fixed_16_16_t d)
+{
+	return DIV_ROUND_UP(val.val, d.val);
+}
+
+static inline u32 mul_round_up_u32_fixed16(u32 val, uint_fixed_16_16_t mul)
+{
+	u64 tmp;
+
+	tmp = mul_u32_u32(val, mul.val);
+	tmp = DIV_ROUND_UP_ULL(tmp, 1 << 16);
+	WARN_ON(tmp > U32_MAX);
+
+	return (u32)tmp;
+}
+
+static inline uint_fixed_16_16_t mul_fixed16(uint_fixed_16_16_t val,
+					     uint_fixed_16_16_t mul)
+{
+	u64 tmp;
+
+	tmp = mul_u32_u32(val.val, mul.val);
+	tmp = tmp >> 16;
+
+	return clamp_u64_to_fixed16(tmp);
+}
+
+static inline uint_fixed_16_16_t div_fixed16(u32 val, u32 d)
+{
+	u64 tmp;
+
+	tmp = (u64)val << 16;
+	tmp = DIV_ROUND_UP_ULL(tmp, d);
+
+	return clamp_u64_to_fixed16(tmp);
+}
+
+static inline u32 div_round_up_u32_fixed16(u32 val, uint_fixed_16_16_t d)
+{
+	u64 tmp;
+
+	tmp = (u64)val << 16;
+	tmp = DIV_ROUND_UP_ULL(tmp, d.val);
+	WARN_ON(tmp > U32_MAX);
+
+	return (u32)tmp;
+}
+
+static inline uint_fixed_16_16_t mul_u32_fixed16(u32 val, uint_fixed_16_16_t mul)
+{
+	u64 tmp;
+
+	tmp = mul_u32_u32(val, mul.val);
+
+	return clamp_u64_to_fixed16(tmp);
+}
+
+static inline uint_fixed_16_16_t add_fixed16(uint_fixed_16_16_t add1,
+					     uint_fixed_16_16_t add2)
+{
+	u64 tmp;
+
+	tmp = (u64)add1.val + add2.val;
+
+	return clamp_u64_to_fixed16(tmp);
+}
+
+static inline uint_fixed_16_16_t add_fixed16_u32(uint_fixed_16_16_t add1,
+						 u32 add2)
+{
+	uint_fixed_16_16_t tmp_add2 = u32_to_fixed16(add2);
+	u64 tmp;
+
+	tmp = (u64)add1.val + tmp_add2.val;
+
+	return clamp_u64_to_fixed16(tmp);
+}
+
+#endif /* _I915_FIXED_H_ */