LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/pci/gk104.c

   1/*
   2 * Copyright 2015 Karol Herbst <nouveau@karolherbst.de>
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * 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 OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: Karol Herbst <nouveau@karolherbst.de>
  23 */
  24#include "priv.h"
  25
  26static int
  27gk104_pcie_version_supported(struct nvkm_pci *pci)
  28{
  29        return (nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x4) == 0x4 ? 2 : 1;
  30}
  31
  32static void
  33gk104_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_speed
  54gk104_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 void
  78gk104_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_speed
  96gk104_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_speed
 112gk104_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 void
 127gk104_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 int
 150gk104_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 int
 182gk104_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_func
 206gk104_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
 224int
 225gk104_pci_new(struct nvkm_device *device, int index, struct nvkm_pci **ppci)
 226{
 227        return nvkm_pci_new_(&gk104_pci_func, device, index, ppci);
 228}
 229