diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/basics/fixpt32_32.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/basics/fixpt32_32.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/basics/fixpt32_32.c b/drivers/gpu/drm/amd/display/dc/basics/fixpt32_32.c new file mode 100644 index 000000000000..4d3aaa82a07b --- /dev/null +++ b/drivers/gpu/drm/amd/display/dc/basics/fixpt32_32.c @@ -0,0 +1,161 @@ +/* + * 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 + * + */ + +#include "dm_services.h" +#include "include/fixed32_32.h" + +static uint64_t u64_div(uint64_t n, uint64_t d) +{ + uint32_t i = 0; + uint64_t r; + uint64_t q = div64_u64_rem(n, d, &r); + + for (i = 0; i < 32; ++i) { + uint64_t sbit = q & (1ULL<<63); + + r <<= 1; + r |= sbit ? 1 : 0; + q <<= 1; + if (r >= d) { + r -= d; + q |= 1; + } + } + + if (2*r >= d) + q += 1; + return q; +} + +struct fixed32_32 dal_fixed32_32_from_fraction(uint32_t n, uint32_t d) +{ + struct fixed32_32 fx; + + fx.value = u64_div((uint64_t)n << 32, (uint64_t)d << 32); + return fx; +} + +struct fixed32_32 dal_fixed32_32_add( + struct fixed32_32 lhs, + struct fixed32_32 rhs) +{ + struct fixed32_32 fx = {lhs.value + rhs.value}; + + ASSERT(fx.value >= rhs.value); + return fx; +} + +struct fixed32_32 dal_fixed32_32_add_int(struct fixed32_32 lhs, uint32_t rhs) +{ + struct fixed32_32 fx = {lhs.value + ((uint64_t)rhs << 32)}; + + ASSERT(fx.value >= (uint64_t)rhs << 32); + return fx; + +} +struct fixed32_32 dal_fixed32_32_sub( + struct fixed32_32 lhs, + struct fixed32_32 rhs) +{ + struct fixed32_32 fx; + + ASSERT(lhs.value >= rhs.value); + fx.value = lhs.value - rhs.value; + return fx; +} + +struct fixed32_32 dal_fixed32_32_sub_int(struct fixed32_32 lhs, uint32_t rhs) +{ + struct fixed32_32 fx; + + ASSERT(lhs.value >= ((uint64_t)rhs<<32)); + fx.value = lhs.value - ((uint64_t)rhs<<32); + return fx; +} + +struct fixed32_32 dal_fixed32_32_mul( + struct fixed32_32 lhs, + struct fixed32_32 rhs) +{ + struct fixed32_32 fx; + uint64_t lhs_int = lhs.value>>32; + uint64_t lhs_frac = (uint32_t)lhs.value; + uint64_t rhs_int = rhs.value>>32; + uint64_t rhs_frac = (uint32_t)rhs.value; + uint64_t ahbh = lhs_int * rhs_int; + uint64_t ahbl = lhs_int * rhs_frac; + uint64_t albh = lhs_frac * rhs_int; + uint64_t albl = lhs_frac * rhs_frac; + + ASSERT((ahbh>>32) == 0); + + fx.value = (ahbh<<32) + ahbl + albh + (albl>>32); + return fx; + +} + +struct fixed32_32 dal_fixed32_32_mul_int(struct fixed32_32 lhs, uint32_t rhs) +{ + struct fixed32_32 fx; + uint64_t lhsi = (lhs.value>>32) * (uint64_t)rhs; + uint64_t lhsf; + + ASSERT((lhsi>>32) == 0); + lhsf = ((uint32_t)lhs.value) * (uint64_t)rhs; + ASSERT((lhsi<<32) + lhsf >= lhsf); + fx.value = (lhsi<<32) + lhsf; + return fx; +} + +struct fixed32_32 dal_fixed32_32_div( + struct fixed32_32 lhs, + struct fixed32_32 rhs) +{ + struct fixed32_32 fx; + + fx.value = u64_div(lhs.value, rhs.value); + return fx; +} + +struct fixed32_32 dal_fixed32_32_div_int(struct fixed32_32 lhs, uint32_t rhs) +{ + struct fixed32_32 fx; + + fx.value = u64_div(lhs.value, (uint64_t)rhs << 32); + return fx; +} + +uint32_t dal_fixed32_32_ceil(struct fixed32_32 v) +{ + ASSERT((uint32_t)v.value ? (v.value >> 32) + 1 >= 1 : true); + return (v.value>>32) + ((uint32_t)v.value ? 1 : 0); +} + +uint32_t dal_fixed32_32_round(struct fixed32_32 v) +{ + ASSERT(v.value + (1ULL<<31) >= (1ULL<<31)); + return (v.value + (1ULL<<31))>>32; +} + |