diff options
author | Grant Likely <grant.likely@secretlab.ca> | 2010-05-22 00:36:56 -0600 |
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committer | Grant Likely <grant.likely@secretlab.ca> | 2010-05-22 00:36:56 -0600 |
commit | cf9b59e9d3e008591d1f54830f570982bb307a0d (patch) | |
tree | 113478ce8fd8c832ba726ffdf59b82cb46356476 /include/drm/drm_fixed.h | |
parent | 44504b2bebf8b5823c59484e73096a7d6574471d (diff) | |
parent | f4b87dee923342505e1ddba8d34ce9de33e75050 (diff) |
Merge remote branch 'origin' into secretlab/next-devicetree
Merging in current state of Linus' tree to deal with merge conflicts and
build failures in vio.c after merge.
Conflicts:
drivers/i2c/busses/i2c-cpm.c
drivers/i2c/busses/i2c-mpc.c
drivers/net/gianfar.c
Also fixed up one line in arch/powerpc/kernel/vio.c to use the
correct node pointer.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'include/drm/drm_fixed.h')
-rw-r--r-- | include/drm/drm_fixed.h | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/include/drm/drm_fixed.h b/include/drm/drm_fixed.h new file mode 100644 index 000000000000..4a08a664ff1f --- /dev/null +++ b/include/drm/drm_fixed.h @@ -0,0 +1,67 @@ +/* + * Copyright 2009 Red Hat 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: Dave Airlie + */ +#ifndef DRM_FIXED_H +#define DRM_FIXED_H + +typedef union dfixed { + u32 full; +} fixed20_12; + + +#define dfixed_const(A) (u32)(((A) << 12))/* + ((B + 0.000122)*4096)) */ +#define dfixed_const_half(A) (u32)(((A) << 12) + 2048) +#define dfixed_const_666(A) (u32)(((A) << 12) + 2731) +#define dfixed_const_8(A) (u32)(((A) << 12) + 3277) +#define dfixed_mul(A, B) ((u64)((u64)(A).full * (B).full + 2048) >> 12) +#define dfixed_init(A) { .full = dfixed_const((A)) } +#define dfixed_init_half(A) { .full = dfixed_const_half((A)) } +#define dfixed_trunc(A) ((A).full >> 12) + +static inline u32 dfixed_floor(fixed20_12 A) +{ + u32 non_frac = dfixed_trunc(A); + + return dfixed_const(non_frac); +} + +static inline u32 dfixed_ceil(fixed20_12 A) +{ + u32 non_frac = dfixed_trunc(A); + + if (A.full > dfixed_const(non_frac)) + return dfixed_const(non_frac + 1); + else + return dfixed_const(non_frac); +} + +static inline u32 dfixed_div(fixed20_12 A, fixed20_12 B) +{ + u64 tmp = ((u64)A.full << 13); + + do_div(tmp, B.full); + tmp += 1; + tmp /= 2; + return lower_32_bits(tmp); +} +#endif |