1 files changed, 540 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/include/fixed31_32.h b/drivers/gpu/drm/amd/display/include/fixed31_32.h
new file mode 100644
index 000000000..16df2a485
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/include/fixed31_32.h
@@ -0,0 +1,540 @@
+/*
+ * Copyright 2012-15 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+#ifndef __DAL_FIXED31_32_H__
+#define __DAL_FIXED31_32_H__
+
+#ifndef LLONG_MAX
+#define LLONG_MAX 9223372036854775807ll
+#endif
+#ifndef LLONG_MIN
+#define LLONG_MIN (-LLONG_MAX - 1ll)
+#endif
+
+#define FIXED31_32_BITS_PER_FRACTIONAL_PART 32
+#ifndef LLONG_MIN
+#define LLONG_MIN (1LL<<63)
+#endif
+#ifndef LLONG_MAX
+#define LLONG_MAX (-1LL>>1)
+#endif
+
+/*
+ * @brief
+ * Arithmetic operations on real numbers
+ * represented as fixed-point numbers.
+ * There are: 1 bit for sign,
+ * 31 bit for integer part,
+ * 32 bits for fractional part.
+ *
+ * @note
+ * Currently, overflows and underflows are asserted;
+ * no special result returned.
+ */
+
+struct fixed31_32 {
+	long long value;
+};
+
+
+/*
+ * @brief
+ * Useful constants
+ */
+
+static const struct fixed31_32 dc_fixpt_zero = { 0 };
+static const struct fixed31_32 dc_fixpt_epsilon = { 1LL };
+static const struct fixed31_32 dc_fixpt_half = { 0x80000000LL };
+static const struct fixed31_32 dc_fixpt_one = { 0x100000000LL };
+
+static const struct fixed31_32 dc_fixpt_pi = { 13493037705LL };
+static const struct fixed31_32 dc_fixpt_two_pi = { 26986075409LL };
+static const struct fixed31_32 dc_fixpt_e = { 11674931555LL };
+static const struct fixed31_32 dc_fixpt_ln2 = { 2977044471LL };
+static const struct fixed31_32 dc_fixpt_ln2_div_2 = { 1488522236LL };
+
+/*
+ * @brief
+ * Initialization routines
+ */
+
+/*
+ * @brief
+ * result = numerator / denominator
+ */
+struct fixed31_32 dc_fixpt_from_fraction(long long numerator, long long denominator);
+
+/*
+ * @brief
+ * result = arg
+ */
+static inline struct fixed31_32 dc_fixpt_from_int(int arg)
+{
+	struct fixed31_32 res;
+
+	res.value = (long long) arg << FIXED31_32_BITS_PER_FRACTIONAL_PART;
+
+	return res;
+}
+
+/*
+ * @brief
+ * Unary operators
+ */
+
+/*
+ * @brief
+ * result = -arg
+ */
+static inline struct fixed31_32 dc_fixpt_neg(struct fixed31_32 arg)
+{
+	struct fixed31_32 res;
+
+	res.value = -arg.value;
+
+	return res;
+}
+
+/*
+ * @brief
+ * result = abs(arg) := (arg >= 0) ? arg : -arg
+ */
+static inline struct fixed31_32 dc_fixpt_abs(struct fixed31_32 arg)
+{
+	if (arg.value < 0)
+		return dc_fixpt_neg(arg);
+	else
+		return arg;
+}
+
+/*
+ * @brief
+ * Binary relational operators
+ */
+
+/*
+ * @brief
+ * result = arg1 < arg2
+ */
+static inline bool dc_fixpt_lt(struct fixed31_32 arg1, struct fixed31_32 arg2)
+{
+	return arg1.value < arg2.value;
+}
+
+/*
+ * @brief
+ * result = arg1 <= arg2
+ */
+static inline bool dc_fixpt_le(struct fixed31_32 arg1, struct fixed31_32 arg2)
+{
+	return arg1.value <= arg2.value;
+}
+
+/*
+ * @brief
+ * result = arg1 == arg2
+ */
+static inline bool dc_fixpt_eq(struct fixed31_32 arg1, struct fixed31_32 arg2)
+{
+	return arg1.value == arg2.value;
+}
+
+/*
+ * @brief
+ * result = min(arg1, arg2) := (arg1 <= arg2) ? arg1 : arg2
+ */
+static inline struct fixed31_32 dc_fixpt_min(struct fixed31_32 arg1, struct fixed31_32 arg2)
+{
+	if (arg1.value <= arg2.value)
+		return arg1;
+	else
+		return arg2;
+}
+
+/*
+ * @brief
+ * result = max(arg1, arg2) := (arg1 <= arg2) ? arg2 : arg1
+ */
+static inline struct fixed31_32 dc_fixpt_max(struct fixed31_32 arg1, struct fixed31_32 arg2)
+{
+	if (arg1.value <= arg2.value)
+		return arg2;
+	else
+		return arg1;
+}
+
+/*
+ * @brief
+ *          | min_value, when arg <= min_value
+ * result = | arg, when min_value < arg < max_value
+ *          | max_value, when arg >= max_value
+ */
+static inline struct fixed31_32 dc_fixpt_clamp(
+	struct fixed31_32 arg,
+	struct fixed31_32 min_value,
+	struct fixed31_32 max_value)
+{
+	if (dc_fixpt_le(arg, min_value))
+		return min_value;
+	else if (dc_fixpt_le(max_value, arg))
+		return max_value;
+	else
+		return arg;
+}
+
+/*
+ * @brief
+ * Binary shift operators
+ */
+
+/*
+ * @brief
+ * result = arg << shift
+ */
+static inline struct fixed31_32 dc_fixpt_shl(struct fixed31_32 arg, unsigned char shift)
+{
+	ASSERT(((arg.value >= 0) && (arg.value <= LLONG_MAX >> shift)) ||
+		((arg.value < 0) && (arg.value >= ~(LLONG_MAX >> shift))));
+
+	arg.value = arg.value << shift;
+
+	return arg;
+}
+
+/*
+ * @brief
+ * result = arg >> shift
+ */
+static inline struct fixed31_32 dc_fixpt_shr(struct fixed31_32 arg, unsigned char shift)
+{
+	bool negative = arg.value < 0;
+
+	if (negative)
+		arg.value = -arg.value;
+	arg.value = arg.value >> shift;
+	if (negative)
+		arg.value = -arg.value;
+	return arg;
+}
+
+/*
+ * @brief
+ * Binary additive operators
+ */
+
+/*
+ * @brief
+ * result = arg1 + arg2
+ */
+static inline struct fixed31_32 dc_fixpt_add(struct fixed31_32 arg1, struct fixed31_32 arg2)
+{
+	struct fixed31_32 res;
+
+	ASSERT(((arg1.value >= 0) && (LLONG_MAX - arg1.value >= arg2.value)) ||
+		((arg1.value < 0) && (LLONG_MIN - arg1.value <= arg2.value)));
+
+	res.value = arg1.value + arg2.value;
+
+	return res;
+}
+
+/*
+ * @brief
+ * result = arg1 + arg2
+ */
+static inline struct fixed31_32 dc_fixpt_add_int(struct fixed31_32 arg1, int arg2)
+{
+	return dc_fixpt_add(arg1, dc_fixpt_from_int(arg2));
+}
+
+/*
+ * @brief
+ * result = arg1 - arg2
+ */
+static inline struct fixed31_32 dc_fixpt_sub(struct fixed31_32 arg1, struct fixed31_32 arg2)
+{
+	struct fixed31_32 res;
+
+	ASSERT(((arg2.value >= 0) && (LLONG_MIN + arg2.value <= arg1.value)) ||
+		((arg2.value < 0) && (LLONG_MAX + arg2.value >= arg1.value)));
+
+	res.value = arg1.value - arg2.value;
+
+	return res;
+}
+
+/*
+ * @brief
+ * result = arg1 - arg2
+ */
+static inline struct fixed31_32 dc_fixpt_sub_int(struct fixed31_32 arg1, int arg2)
+{
+	return dc_fixpt_sub(arg1, dc_fixpt_from_int(arg2));
+}
+
+
+/*
+ * @brief
+ * Binary multiplicative operators
+ */
+
+/*
+ * @brief
+ * result = arg1 * arg2
+ */
+struct fixed31_32 dc_fixpt_mul(struct fixed31_32 arg1, struct fixed31_32 arg2);
+
+
+/*
+ * @brief
+ * result = arg1 * arg2
+ */
+static inline struct fixed31_32 dc_fixpt_mul_int(struct fixed31_32 arg1, int arg2)
+{
+	return dc_fixpt_mul(arg1, dc_fixpt_from_int(arg2));
+}
+
+/*
+ * @brief
+ * result = square(arg) := arg * arg
+ */
+struct fixed31_32 dc_fixpt_sqr(struct fixed31_32 arg);
+
+/*
+ * @brief
+ * result = arg1 / arg2
+ */
+static inline struct fixed31_32 dc_fixpt_div_int(struct fixed31_32 arg1, long long arg2)
+{
+	return dc_fixpt_from_fraction(arg1.value, dc_fixpt_from_int(arg2).value);
+}
+
+/*
+ * @brief
+ * result = arg1 / arg2
+ */
+static inline struct fixed31_32 dc_fixpt_div(struct fixed31_32 arg1, struct fixed31_32 arg2)
+{
+	return dc_fixpt_from_fraction(arg1.value, arg2.value);
+}
+
+/*
+ * @brief
+ * Reciprocal function
+ */
+
+/*
+ * @brief
+ * result = reciprocal(arg) := 1 / arg
+ *
+ * @note
+ * No special actions taken in case argument is zero.
+ */
+struct fixed31_32 dc_fixpt_recip(struct fixed31_32 arg);
+
+/*
+ * @brief
+ * Trigonometric functions
+ */
+
+/*
+ * @brief
+ * result = sinc(arg) := sin(arg) / arg
+ *
+ * @note
+ * Argument specified in radians,
+ * internally it's normalized to [-2pi...2pi] range.
+ */
+struct fixed31_32 dc_fixpt_sinc(struct fixed31_32 arg);
+
+/*
+ * @brief
+ * result = sin(arg)
+ *
+ * @note
+ * Argument specified in radians,
+ * internally it's normalized to [-2pi...2pi] range.
+ */
+struct fixed31_32 dc_fixpt_sin(struct fixed31_32 arg);
+
+/*
+ * @brief
+ * result = cos(arg)
+ *
+ * @note
+ * Argument specified in radians
+ * and should be in [-2pi...2pi] range -
+ * passing arguments outside that range
+ * will cause incorrect result!
+ */
+struct fixed31_32 dc_fixpt_cos(struct fixed31_32 arg);
+
+/*
+ * @brief
+ * Transcendent functions
+ */
+
+/*
+ * @brief
+ * result = exp(arg)
+ *
+ * @note
+ * Currently, function is verified for abs(arg) <= 1.
+ */
+struct fixed31_32 dc_fixpt_exp(struct fixed31_32 arg);
+
+/*
+ * @brief
+ * result = log(arg)
+ *
+ * @note
+ * Currently, abs(arg) should be less than 1.
+ * No normalization is done.
+ * Currently, no special actions taken
+ * in case of invalid argument(s). Take care!
+ */
+struct fixed31_32 dc_fixpt_log(struct fixed31_32 arg);
+
+/*
+ * @brief
+ * Power function
+ */
+
+/*
+ * @brief
+ * result = pow(arg1, arg2)
+ *
+ * @note
+ * Currently, abs(arg1) should be less than 1. Take care!
+ */
+static inline struct fixed31_32 dc_fixpt_pow(struct fixed31_32 arg1, struct fixed31_32 arg2)
+{
+	if (arg1.value == 0)
+		return arg2.value == 0 ? dc_fixpt_one : dc_fixpt_zero;
+
+	return dc_fixpt_exp(
+		dc_fixpt_mul(
+			dc_fixpt_log(arg1),
+			arg2));
+}
+
+/*
+ * @brief
+ * Rounding functions
+ */
+
+/*
+ * @brief
+ * result = floor(arg) := greatest integer lower than or equal to arg
+ */
+static inline int dc_fixpt_floor(struct fixed31_32 arg)
+{
+	unsigned long long arg_value = arg.value > 0 ? arg.value : -arg.value;
+
+	if (arg.value >= 0)
+		return (int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);
+	else
+		return -(int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);
+}
+
+/*
+ * @brief
+ * result = round(arg) := integer nearest to arg
+ */
+static inline int dc_fixpt_round(struct fixed31_32 arg)
+{
+	unsigned long long arg_value = arg.value > 0 ? arg.value : -arg.value;
+
+	const long long summand = dc_fixpt_half.value;
+
+	ASSERT(LLONG_MAX - (long long)arg_value >= summand);
+
+	arg_value += summand;
+
+	if (arg.value >= 0)
+		return (int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);
+	else
+		return -(int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);
+}
+
+/*
+ * @brief
+ * result = ceil(arg) := lowest integer greater than or equal to arg
+ */
+static inline int dc_fixpt_ceil(struct fixed31_32 arg)
+{
+	unsigned long long arg_value = arg.value > 0 ? arg.value : -arg.value;
+
+	const long long summand = dc_fixpt_one.value -
+		dc_fixpt_epsilon.value;
+
+	ASSERT(LLONG_MAX - (long long)arg_value >= summand);
+
+	arg_value += summand;
+
+	if (arg.value >= 0)
+		return (int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);
+	else
+		return -(int)(arg_value >> FIXED31_32_BITS_PER_FRACTIONAL_PART);
+}
+
+/* the following two function are used in scaler hw programming to convert fixed
+ * point value to format 2 bits from integer part and 19 bits from fractional
+ * part. The same applies for u0d19, 0 bits from integer part and 19 bits from
+ * fractional
+ */
+
+unsigned int dc_fixpt_u4d19(struct fixed31_32 arg);
+
+unsigned int dc_fixpt_u3d19(struct fixed31_32 arg);
+
+unsigned int dc_fixpt_u2d19(struct fixed31_32 arg);
+
+unsigned int dc_fixpt_u0d19(struct fixed31_32 arg);
+
+unsigned int dc_fixpt_clamp_u0d14(struct fixed31_32 arg);
+
+unsigned int dc_fixpt_clamp_u0d10(struct fixed31_32 arg);
+
+int dc_fixpt_s4d19(struct fixed31_32 arg);
+
+static inline struct fixed31_32 dc_fixpt_truncate(struct fixed31_32 arg, unsigned int frac_bits)
+{
+	bool negative = arg.value < 0;
+
+	if (frac_bits >= FIXED31_32_BITS_PER_FRACTIONAL_PART) {
+		ASSERT(frac_bits == FIXED31_32_BITS_PER_FRACTIONAL_PART);
+		return arg;
+	}
+
+	if (negative)
+		arg.value = -arg.value;
+	arg.value &= (~0LL) << (FIXED31_32_BITS_PER_FRACTIONAL_PART - frac_bits);
+	if (negative)
+		arg.value = -arg.value;
+	return arg;
+}
+
+#endif