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1/*2 * Copyright 2015 Karol Herbst <nouveau@karolherbst.de>3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: Karol Herbst <nouveau@karolherbst.de>23 */24#include "priv.h"25 26static int27gk104_pcie_version_supported(struct nvkm_pci *pci)28{29 return (nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x4) == 0x4 ? 2 : 1;30}31 32static void33gk104_pcie_set_cap_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)34{35 struct nvkm_device *device = pci->subdev.device;36 37 switch (speed) {38 case NVKM_PCIE_SPEED_2_5:39 gf100_pcie_set_cap_speed(pci, false);40 nvkm_mask(device, 0x8c1c0, 0x30000, 0x10000);41 break;42 case NVKM_PCIE_SPEED_5_0:43 gf100_pcie_set_cap_speed(pci, true);44 nvkm_mask(device, 0x8c1c0, 0x30000, 0x20000);45 break;46 case NVKM_PCIE_SPEED_8_0:47 gf100_pcie_set_cap_speed(pci, true);48 nvkm_mask(device, 0x8c1c0, 0x30000, 0x30000);49 break;50 }51}52 53static enum nvkm_pcie_speed54gk104_pcie_cap_speed(struct nvkm_pci *pci)55{56 int speed = gf100_pcie_cap_speed(pci);57 58 if (speed == 0)59 return NVKM_PCIE_SPEED_2_5;60 61 if (speed >= 1) {62 int speed2 = nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x30000;63 switch (speed2) {64 case 0x00000:65 case 0x10000:66 return NVKM_PCIE_SPEED_2_5;67 case 0x20000:68 return NVKM_PCIE_SPEED_5_0;69 case 0x30000:70 return NVKM_PCIE_SPEED_8_0;71 }72 }73 74 return -EINVAL;75}76 77static void78gk104_pcie_set_lnkctl_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)79{80 u8 reg_v = 0;81 switch (speed) {82 case NVKM_PCIE_SPEED_2_5:83 reg_v = 1;84 break;85 case NVKM_PCIE_SPEED_5_0:86 reg_v = 2;87 break;88 case NVKM_PCIE_SPEED_8_0:89 reg_v = 3;90 break;91 }92 nvkm_pci_mask(pci, 0xa8, 0x3, reg_v);93}94 95static enum nvkm_pcie_speed96gk104_pcie_lnkctl_speed(struct nvkm_pci *pci)97{98 u8 reg_v = nvkm_pci_rd32(pci, 0xa8) & 0x3;99 switch (reg_v) {100 case 0:101 case 1:102 return NVKM_PCIE_SPEED_2_5;103 case 2:104 return NVKM_PCIE_SPEED_5_0;105 case 3:106 return NVKM_PCIE_SPEED_8_0;107 }108 return -1;109}110 111static enum nvkm_pcie_speed112gk104_pcie_max_speed(struct nvkm_pci *pci)113{114 u32 max_speed = nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x300000;115 switch (max_speed) {116 case 0x000000:117 return NVKM_PCIE_SPEED_8_0;118 case 0x100000:119 return NVKM_PCIE_SPEED_5_0;120 case 0x200000:121 return NVKM_PCIE_SPEED_2_5;122 }123 return NVKM_PCIE_SPEED_2_5;124}125 126static void127gk104_pcie_set_link_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)128{129 struct nvkm_device *device = pci->subdev.device;130 u32 mask_value;131 132 switch (speed) {133 case NVKM_PCIE_SPEED_8_0:134 mask_value = 0x00000;135 break;136 case NVKM_PCIE_SPEED_5_0:137 mask_value = 0x40000;138 break;139 case NVKM_PCIE_SPEED_2_5:140 default:141 mask_value = 0x80000;142 break;143 }144 145 nvkm_mask(device, 0x8c040, 0xc0000, mask_value);146 nvkm_mask(device, 0x8c040, 0x1, 0x1);147}148 149static int150gk104_pcie_init(struct nvkm_pci * pci)151{152 enum nvkm_pcie_speed lnkctl_speed, max_speed, cap_speed;153 struct nvkm_subdev *subdev = &pci->subdev;154 155 if (gf100_pcie_version(pci) < 2)156 return 0;157 158 lnkctl_speed = gk104_pcie_lnkctl_speed(pci);159 max_speed = gk104_pcie_max_speed(pci);160 cap_speed = gk104_pcie_cap_speed(pci);161 162 if (cap_speed != max_speed) {163 nvkm_trace(subdev, "adjusting cap to max speed\n");164 gk104_pcie_set_cap_speed(pci, max_speed);165 cap_speed = gk104_pcie_cap_speed(pci);166 if (cap_speed != max_speed)167 nvkm_warn(subdev, "failed to adjust cap speed\n");168 }169 170 if (lnkctl_speed != max_speed) {171 nvkm_debug(subdev, "adjusting lnkctl to max speed\n");172 gk104_pcie_set_lnkctl_speed(pci, max_speed);173 lnkctl_speed = gk104_pcie_lnkctl_speed(pci);174 if (lnkctl_speed != max_speed)175 nvkm_error(subdev, "failed to adjust lnkctl speed\n");176 }177 178 return 0;179}180 181static int182gk104_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width)183{184 struct nvkm_subdev *subdev = &pci->subdev;185 enum nvkm_pcie_speed lnk_ctl_speed = gk104_pcie_lnkctl_speed(pci);186 enum nvkm_pcie_speed lnk_cap_speed = gk104_pcie_cap_speed(pci);187 188 if (speed > lnk_cap_speed) {189 speed = lnk_cap_speed;190 nvkm_warn(subdev, "dropping requested speed due too low cap"191 " speed\n");192 }193 194 if (speed > lnk_ctl_speed) {195 speed = lnk_ctl_speed;196 nvkm_warn(subdev, "dropping requested speed due too low"197 " lnkctl speed\n");198 }199 200 gk104_pcie_set_link_speed(pci, speed);201 return 0;202}203 204 205static const struct nvkm_pci_func206gk104_pci_func = {207 .init = g84_pci_init,208 .rd32 = nv40_pci_rd32,209 .wr08 = nv40_pci_wr08,210 .wr32 = nv40_pci_wr32,211 .msi_rearm = nv40_pci_msi_rearm,212 213 .pcie.init = gk104_pcie_init,214 .pcie.set_link = gk104_pcie_set_link,215 216 .pcie.max_speed = gk104_pcie_max_speed,217 .pcie.cur_speed = g84_pcie_cur_speed,218 219 .pcie.set_version = gf100_pcie_set_version,220 .pcie.version = gf100_pcie_version,221 .pcie.version_supported = gk104_pcie_version_supported,222};223 224int225gk104_pci_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,226 struct nvkm_pci **ppci)227{228 return nvkm_pci_new_(&gk104_pci_func, device, type, inst, ppci);229}230