subdev/fb/gddr5.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  */
0024 #include "ram.h"
0025
0026 /* binary driver only executes this path if the condition (a) is true
0027  * for any configuration (combination of rammap+ramcfg+timing) that
0028  * can be reached on a given card.  for now, we will execute the branch
0029  * unconditionally in the hope that a "false everywhere" in the bios
0030  * tables doesn't actually mean "don't touch this".
0031  */
0032 #define NOTE00(a) 1
0033
0034 int
0035 nvkm_gddr5_calc(struct nvkm_ram *ram, bool nuts)
0036 {
0037     int pd, lf, xd, vh, vr, vo, l3;
0038     int WL, CL, WR, at[2], dt, ds;
0039     int rq = ram->freq < 1000000; /* XXX */
0040
0041     xd = !ram->next->bios.ramcfg_DLLoff;
0042
0043     switch (ram->next->bios.ramcfg_ver) {
0044     case 0x11:
0045         pd =  ram->next->bios.ramcfg_11_01_80;
0046         lf =  ram->next->bios.ramcfg_11_01_40;
0047         vh =  ram->next->bios.ramcfg_11_02_10;
0048         vr =  ram->next->bios.ramcfg_11_02_04;
0049         vo =  ram->next->bios.ramcfg_11_06;
0050         l3 = !ram->next->bios.ramcfg_11_07_02;
0051         break;
0052     default:
0053         return -ENOSYS;
0054     }
0055
0056     switch (ram->next->bios.timing_ver) {
0057     case 0x20:
0058         WL = (ram->next->bios.timing[1] & 0x00000f80) >> 7;
0059         CL = (ram->next->bios.timing[1] & 0x0000001f);
0060         WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16;
0061         at[0] = ram->next->bios.timing_20_2e_c0;
0062         at[1] = ram->next->bios.timing_20_2e_30;
0063         dt =  ram->next->bios.timing_20_2e_03;
0064         ds =  ram->next->bios.timing_20_2f_03;
0065         break;
0066     default:
0067         return -ENOSYS;
0068     }
0069
0070     if (WL < 1 || WL > 7 || CL < 5 || CL > 36 || WR < 4 || WR > 35)
0071         return -EINVAL;
0072     CL -= 5;
0073     WR -= 4;
0074
0075     ram->mr[0] &= ~0xf7f;
0076     ram->mr[0] |= (WR & 0x0f) << 8;
0077     ram->mr[0] |= (CL & 0x0f) << 3;
0078     ram->mr[0] |= (WL & 0x07) << 0;
0079
0080     ram->mr[1] &= ~0x0bf;
0081     ram->mr[1] |= (xd & 0x01) << 7;
0082     ram->mr[1] |= (at[0] & 0x03) << 4;
0083     ram->mr[1] |= (dt & 0x03) << 2;
0084     ram->mr[1] |= (ds & 0x03) << 0;
0085
0086     /* this seems wrong, alternate field used for the broadcast
0087      * on nuts vs non-nuts configs..  meh, it matches for now.
0088      */
0089     ram->mr1_nuts = ram->mr[1];
0090     if (nuts) {
0091         ram->mr[1] &= ~0x030;
0092         ram->mr[1] |= (at[1] & 0x03) << 4;
0093     }
0094
0095     ram->mr[3] &= ~0x020;
0096     ram->mr[3] |= (rq & 0x01) << 5;
0097
0098     ram->mr[5] &= ~0x004;
0099     ram->mr[5] |= (l3 << 2);
0100
0101     if (!vo)
0102         vo = (ram->mr[6] & 0xff0) >> 4;
0103     if (ram->mr[6] & 0x001)
0104         pd = 1; /* binary driver does this.. bug? */
0105     ram->mr[6] &= ~0xff1;
0106     ram->mr[6] |= (vo & 0xff) << 4;
0107     ram->mr[6] |= (pd & 0x01) << 0;
0108
0109     if (NOTE00(vr)) {
0110         ram->mr[7] &= ~0x300;
0111         ram->mr[7] |= (vr & 0x03) << 8;
0112     }
0113     ram->mr[7] &= ~0x088;
0114     ram->mr[7] |= (vh & 0x01) << 7;
0115     ram->mr[7] |= (lf & 0x01) << 3;
0116
0117     ram->mr[8] &= ~0x003;
0118     ram->mr[8] |= (WR & 0x10) >> 3;
0119     ram->mr[8] |= (CL & 0x10) >> 4;
0120     return 0;
0121 }