1/* $NetBSD: nouveau_nvkm_subdev_fb_gddr5.c,v 1.3 2021/12/18 23:45:39 riastradh Exp $ */ 2 3/* 4 * Copyright 2013 Red Hat Inc. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 22 * OTHER DEALINGS IN THE SOFTWARE. 23 * 24 * Authors: Ben Skeggs <bskeggs@redhat.com> 25 */ 26#include <sys/cdefs.h> 27__KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_fb_gddr5.c,v 1.3 2021/12/18 23:45:39 riastradh Exp $"); 28 29#include "ram.h" 30 31/* binary driver only executes this path if the condition (a) is true 32 * for any configuration (combination of rammap+ramcfg+timing) that 33 * can be reached on a given card. for now, we will execute the branch 34 * unconditionally in the hope that a "false everywhere" in the bios 35 * tables doesn't actually mean "don't touch this". 36 */ 37#define NOTE00(a) 1 38 39int 40nvkm_gddr5_calc(struct nvkm_ram *ram, bool nuts) 41{ 42 int pd, lf, xd, vh, vr, vo, l3; 43 int WL, CL, WR, at[2], dt, ds; 44 int rq = ram->freq < 1000000; /* XXX */ 45 46 xd = !ram->next->bios.ramcfg_DLLoff; 47 48 switch (ram->next->bios.ramcfg_ver) { 49 case 0x11: 50 pd = ram->next->bios.ramcfg_11_01_80; 51 lf = ram->next->bios.ramcfg_11_01_40; 52 vh = ram->next->bios.ramcfg_11_02_10; 53 vr = ram->next->bios.ramcfg_11_02_04; 54 vo = ram->next->bios.ramcfg_11_06; 55 l3 = !ram->next->bios.ramcfg_11_07_02; 56 break; 57 default: 58 return -ENOSYS; 59 } 60 61 switch (ram->next->bios.timing_ver) { 62 case 0x20: 63 WL = (ram->next->bios.timing[1] & 0x00000f80) >> 7; 64 CL = (ram->next->bios.timing[1] & 0x0000001f); 65 WR = (ram->next->bios.timing[2] & 0x007f0000) >> 16; 66 at[0] = ram->next->bios.timing_20_2e_c0; 67 at[1] = ram->next->bios.timing_20_2e_30; 68 dt = ram->next->bios.timing_20_2e_03; 69 ds = ram->next->bios.timing_20_2f_03; 70 break; 71 default: 72 return -ENOSYS; 73 } 74 75 if (WL < 1 || WL > 7 || CL < 5 || CL > 36 || WR < 4 || WR > 35) 76 return -EINVAL; 77 CL -= 5; 78 WR -= 4; 79 80 ram->mr[0] &= ~0xf7f; 81 ram->mr[0] |= (WR & 0x0f) << 8; 82 ram->mr[0] |= (CL & 0x0f) << 3; 83 ram->mr[0] |= (WL & 0x07) << 0; 84 85 ram->mr[1] &= ~0x0bf; 86 ram->mr[1] |= (xd & 0x01) << 7; 87 ram->mr[1] |= (at[0] & 0x03) << 4; 88 ram->mr[1] |= (dt & 0x03) << 2; 89 ram->mr[1] |= (ds & 0x03) << 0; 90 91 /* this seems wrong, alternate field used for the broadcast 92 * on nuts vs non-nuts configs.. meh, it matches for now. 93 */ 94 ram->mr1_nuts = ram->mr[1]; 95 if (nuts) { 96 ram->mr[1] &= ~0x030; 97 ram->mr[1] |= (at[1] & 0x03) << 4; 98 } 99 100 ram->mr[3] &= ~0x020; 101 ram->mr[3] |= (rq & 0x01) << 5; 102 103 ram->mr[5] &= ~0x004; 104 ram->mr[5] |= (l3 << 2); 105 106 if (!vo) 107 vo = (ram->mr[6] & 0xff0) >> 4; 108 if (ram->mr[6] & 0x001) 109 pd = 1; /* binary driver does this.. bug? */ 110 ram->mr[6] &= ~0xff1; 111 ram->mr[6] |= (vo & 0xff) << 4; 112 ram->mr[6] |= (pd & 0x01) << 0; 113 114 if (NOTE00(vr)) { 115 ram->mr[7] &= ~0x300; 116 ram->mr[7] |= (vr & 0x03) << 8; 117 } 118 ram->mr[7] &= ~0x088; 119 ram->mr[7] |= (vh & 0x01) << 7; 120 ram->mr[7] |= (lf & 0x01) << 3; 121 122 ram->mr[8] &= ~0x003; 123 ram->mr[8] |= (WR & 0x10) >> 3; 124 ram->mr[8] |= (CL & 0x10) >> 4; 125 return 0; 126} 127