diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/fb/sddr2.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/fb/sddr2.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/fb/sddr2.c b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/sddr2.c new file mode 100644 index 000000000000..afab42df28d4 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/fb/sddr2.c @@ -0,0 +1,93 @@ +/* + * Copyright 2014 Roy Spliet + * + * 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: Roy Spliet <rspliet@eclipso.eu> + * Ben Skeggs + */ +#include "priv.h" + +struct ramxlat { + int id; + u8 enc; +}; + +static inline int +ramxlat(const struct ramxlat *xlat, int id) +{ + while (xlat->id >= 0) { + if (xlat->id == id) + return xlat->enc; + xlat++; + } + return -EINVAL; +} + +static const struct ramxlat +ramddr2_cl[] = { + { 2, 2 }, { 3, 3 }, { 4, 4 }, { 5, 5 }, { 6, 6 }, + /* The following are available in some, but not all DDR2 docs */ + { 7, 7 }, + { -1 } +}; + +static const struct ramxlat +ramddr2_wr[] = { + { 2, 1 }, { 3, 2 }, { 4, 3 }, { 5, 4 }, { 6, 5 }, + /* The following are available in some, but not all DDR2 docs */ + { 7, 6 }, + { -1 } +}; + +int +nvkm_sddr2_calc(struct nvkm_ram *ram) +{ + int CL, WR, DLL = 0, ODT = 0; + + switch (ram->next->bios.timing_ver) { + case 0x10: + CL = ram->next->bios.timing_10_CL; + WR = ram->next->bios.timing_10_WR; + DLL = !ram->next->bios.ramcfg_10_DLLoff; + ODT = ram->next->bios.timing_10_ODT & 3; + break; + case 0x20: + CL = (ram->next->bios.timing[1] & 0x0000001f); + WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16; + break; + default: + return -ENOSYS; + } + + CL = ramxlat(ramddr2_cl, CL); + WR = ramxlat(ramddr2_wr, WR); + if (CL < 0 || WR < 0) + return -EINVAL; + + ram->mr[0] &= ~0xf70; + ram->mr[0] |= (WR & 0x07) << 9; + ram->mr[0] |= (CL & 0x07) << 4; + + ram->mr[1] &= ~0x045; + ram->mr[1] |= (ODT & 0x1) << 2; + ram->mr[1] |= (ODT & 0x2) << 5; + ram->mr[1] |= !DLL; + return 0; +} |