[linux-block.git] / drivers / gpu / drm / i915 / i915_fixed.h

/* 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_ */
Commit	Line	Data
2d332ee1 JN	1	/* SPDX-License-Identifier: MIT */
	2	/*
	3	* Copyright © 2018 Intel Corporation
	4	*/
	5
	6	#ifndef _I915_FIXED_H_
	7	#define _I915_FIXED_H_
	8
c75299ae JN	9	#include <linux/bug.h>
	10	#include <linux/kernel.h>
	11	#include <linux/math64.h>
	12	#include <linux/types.h>
	13
2d332ee1	14	typedef struct {
3122b9c5	15	u32 val;
2d332ee1 JN	16	} uint_fixed_16_16_t;
2d332ee1 JN	17
e7a23816	18	#define FP_16_16_MAX ((uint_fixed_16_16_t){ .val = UINT_MAX })
2d332ee1 JN	19
	20	static inline bool is_fixed16_zero(uint_fixed_16_16_t val)
	21	{
f1eea891	22	return val.val == 0;
2d332ee1 JN	23	}
2d332ee1 JN	24
3122b9c5	25	static inline uint_fixed_16_16_t u32_to_fixed16(u32 val)
2d332ee1	26	{
f48cc647	27	uint_fixed_16_16_t fp = { .val = val << 16 };
2d332ee1 JN	28
	29	WARN_ON(val > U16_MAX);
	30
2d332ee1 JN	31	return fp;
	32	}
	33
3122b9c5	34	static inline u32 fixed16_to_u32_round_up(uint_fixed_16_16_t fp)
2d332ee1 JN	35	{
	36	return DIV_ROUND_UP(fp.val, 1 << 16);
	37	}
	38
3122b9c5	39	static inline u32 fixed16_to_u32(uint_fixed_16_16_t fp)
2d332ee1 JN	40	{
	41	return fp.val >> 16;
	42	}
	43
	44	static inline uint_fixed_16_16_t min_fixed16(uint_fixed_16_16_t min1,
	45	uint_fixed_16_16_t min2)
	46	{
f48cc647	47	uint_fixed_16_16_t min = { .val = min(min1.val, min2.val) };
2d332ee1	48
2d332ee1 JN	49	return min;
	50	}
	51
	52	static inline uint_fixed_16_16_t max_fixed16(uint_fixed_16_16_t max1,
	53	uint_fixed_16_16_t max2)
	54	{
f48cc647	55	uint_fixed_16_16_t max = { .val = max(max1.val, max2.val) };
2d332ee1	56
2d332ee1 JN	57	return max;
	58	}
	59
3122b9c5	60	static inline uint_fixed_16_16_t clamp_u64_to_fixed16(u64 val)
2d332ee1	61	{
f48cc647 JN	62	uint_fixed_16_16_t fp = { .val = (u32)val };
f48cc647 JN	63
2d332ee1	64	WARN_ON(val > U32_MAX);
f48cc647	65
2d332ee1 JN	66	return fp;
	67	}
	68
3122b9c5 JN	69	static inline u32 div_round_up_fixed16(uint_fixed_16_16_t val,
3122b9c5 JN	70	uint_fixed_16_16_t d)
2d332ee1 JN	71	{
	72	return DIV_ROUND_UP(val.val, d.val);
	73	}
	74
3122b9c5	75	static inline u32 mul_round_up_u32_fixed16(u32 val, uint_fixed_16_16_t mul)
2d332ee1	76	{
f48cc647 JN	77	u64 tmp;
f48cc647 JN	78
d492a29d	79	tmp = mul_u32_u32(val, mul.val);
f48cc647 JN	80	tmp = DIV_ROUND_UP_ULL(tmp, 1 << 16);
f48cc647 JN	81	WARN_ON(tmp > U32_MAX);
2d332ee1	82
f48cc647	83	return (u32)tmp;
2d332ee1 JN	84	}
	85
	86	static inline uint_fixed_16_16_t mul_fixed16(uint_fixed_16_16_t val,
	87	uint_fixed_16_16_t mul)
	88	{
f48cc647	89	u64 tmp;
2d332ee1	90
d492a29d	91	tmp = mul_u32_u32(val.val, mul.val);
f48cc647 JN	92	tmp = tmp >> 16;
	93
	94	return clamp_u64_to_fixed16(tmp);
2d332ee1 JN	95	}
2d332ee1 JN	96
3122b9c5	97	static inline uint_fixed_16_16_t div_fixed16(u32 val, u32 d)
2d332ee1	98	{
f48cc647 JN	99	u64 tmp;
	100
	101	tmp = (u64)val << 16;
	102	tmp = DIV_ROUND_UP_ULL(tmp, d);
2d332ee1	103
f48cc647	104	return clamp_u64_to_fixed16(tmp);
2d332ee1 JN	105	}
2d332ee1 JN	106
3122b9c5	107	static inline u32 div_round_up_u32_fixed16(u32 val, uint_fixed_16_16_t d)
2d332ee1	108	{
f48cc647	109	u64 tmp;
2d332ee1	110
f48cc647 JN	111	tmp = (u64)val << 16;
	112	tmp = DIV_ROUND_UP_ULL(tmp, d.val);
	113	WARN_ON(tmp > U32_MAX);
	114
	115	return (u32)tmp;
2d332ee1 JN	116	}
2d332ee1 JN	117
3122b9c5	118	static inline uint_fixed_16_16_t mul_u32_fixed16(u32 val, uint_fixed_16_16_t mul)
2d332ee1	119	{
f48cc647 JN	120	u64 tmp;
f48cc647 JN	121
d492a29d	122	tmp = mul_u32_u32(val, mul.val);
2d332ee1	123
f48cc647	124	return clamp_u64_to_fixed16(tmp);
2d332ee1 JN	125	}
	126
	127	static inline uint_fixed_16_16_t add_fixed16(uint_fixed_16_16_t add1,
	128	uint_fixed_16_16_t add2)
	129	{
f48cc647	130	u64 tmp;
2d332ee1	131
f48cc647 JN	132	tmp = (u64)add1.val + add2.val;
	133
	134	return clamp_u64_to_fixed16(tmp);
2d332ee1 JN	135	}
	136
	137	static inline uint_fixed_16_16_t add_fixed16_u32(uint_fixed_16_16_t add1,
3122b9c5	138	u32 add2)
2d332ee1	139	{
f48cc647 JN	140	uint_fixed_16_16_t tmp_add2 = u32_to_fixed16(add2);
	141	u64 tmp;
	142
	143	tmp = (u64)add1.val + tmp_add2.val;
2d332ee1	144
f48cc647	145	return clamp_u64_to_fixed16(tmp);
2d332ee1 JN	146	}
	147
	148	#endif /* _I915_FIXED_H_ */