subdev/fb/gddr3.c

0001 /*
0002  * Copyright 2013 Red Hat Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Ben Skeggs <bskeggs@redhat.com>
0023  *      Roy Spliet <rspliet@eclipso.eu>
0024  */
0025 #include "ram.h"
0026
0027 struct ramxlat {
0028     int id;
0029     u8 enc;
0030 };
0031
0032 static inline int
0033 ramxlat(const struct ramxlat *xlat, int id)
0034 {
0035     while (xlat->id >= 0) {
0036         if (xlat->id == id)
0037             return xlat->enc;
0038         xlat++;
0039     }
0040     return -EINVAL;
0041 }
0042
0043 static const struct ramxlat
0044 ramgddr3_cl_lo[] = {
0045     { 5, 5 }, { 7, 7 }, { 8, 0 }, { 9, 1 }, { 10, 2 }, { 11, 3 }, { 12, 8 },
0046     /* the below are mentioned in some, but not all, gddr3 docs */
0047     { 13, 9 }, { 14, 6 },
0048     /* XXX: Per Samsung docs, are these used? They overlap with Qimonda */
0049     /* { 4, 4 }, { 5, 5 }, { 6, 6 }, { 12, 8 }, { 13, 9 }, { 14, 10 },
0050      * { 15, 11 }, */
0051     { -1 }
0052 };
0053
0054 static const struct ramxlat
0055 ramgddr3_cl_hi[] = {
0056     { 10, 2 }, { 11, 3 }, { 12, 4 }, { 13, 5 }, { 14, 6 }, { 15, 7 },
0057     { 16, 0 }, { 17, 1 },
0058     { -1 }
0059 };
0060
0061 static const struct ramxlat
0062 ramgddr3_wr_lo[] = {
0063     { 5, 2 }, { 7, 4 }, { 8, 5 }, { 9, 6 }, { 10, 7 },
0064     { 11, 0 }, { 13 , 1 },
0065     /* the below are mentioned in some, but not all, gddr3 docs */
0066     { 4, 0 }, { 6, 3 }, { 12, 1 },
0067     { -1 }
0068 };
0069
0070 int
0071 nvkm_gddr3_calc(struct nvkm_ram *ram)
0072 {
0073     int CL, WR, CWL, DLL = 0, ODT = 0, RON, hi;
0074
0075     switch (ram->next->bios.timing_ver) {
0076     case 0x10:
0077         CWL = ram->next->bios.timing_10_CWL;
0078         CL  = ram->next->bios.timing_10_CL;
0079         WR  = ram->next->bios.timing_10_WR;
0080         DLL = !ram->next->bios.ramcfg_DLLoff;
0081         ODT = ram->next->bios.timing_10_ODT;
0082         RON = ram->next->bios.ramcfg_RON;
0083         break;
0084     case 0x20:
0085         CWL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
0086         CL  = (ram->next->bios.timing[1] & 0x0000001f) >> 0;
0087         WR  = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
0088         /* XXX: Get these values from the VBIOS instead */
0089         DLL = !(ram->mr[1] & 0x1);
0090         RON = !((ram->mr[1] & 0x300) >> 8);
0091         break;
0092     default:
0093         return -ENOSYS;
0094     }
0095
0096     if (ram->next->bios.timing_ver == 0x20 ||
0097         ram->next->bios.ramcfg_timing == 0xff) {
0098         ODT =  (ram->mr[1] & 0xc) >> 2;
0099     }
0100
0101     hi = ram->mr[2] & 0x1;
0102     CL  = ramxlat(hi ? ramgddr3_cl_hi : ramgddr3_cl_lo, CL);
0103     WR  = ramxlat(ramgddr3_wr_lo, WR);
0104     if (CL < 0 || CWL < 1 || CWL > 7 || WR < 0)
0105         return -EINVAL;
0106
0107     ram->mr[0] &= ~0xf74;
0108     ram->mr[0] |= (CWL & 0x07) << 9;
0109     ram->mr[0] |= (CL & 0x07) << 4;
0110     ram->mr[0] |= (CL & 0x08) >> 1;
0111
0112     ram->mr[1] &= ~0x3fc;
0113     ram->mr[1] |= (ODT & 0x03) << 2;
0114     ram->mr[1] |= (RON & 0x03) << 8;
0115     ram->mr[1] |= (WR  & 0x03) << 4;
0116     ram->mr[1] |= (WR  & 0x04) << 5;
0117     ram->mr[1] |= !DLL << 6;
0118     return 0;
0119 }