158 lines · c
1/*2 * Copyright 2015 Red Hat Inc.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: Ben Skeggs <bskeggs@redhat.com>23 */24#include "priv.h"25 26#include <core/pci.h>27 28static int29g84_pcie_version_supported(struct nvkm_pci *pci)30{31 /* g84 and g86 report wrong information about what they support */32 return 1;33}34 35int36g84_pcie_version(struct nvkm_pci *pci)37{38 struct nvkm_device *device = pci->subdev.device;39 return (nvkm_rd32(device, 0x00154c) & 0x1) + 1;40}41 42void43g84_pcie_set_version(struct nvkm_pci *pci, u8 ver)44{45 struct nvkm_device *device = pci->subdev.device;46 nvkm_mask(device, 0x00154c, 0x1, (ver >= 2 ? 0x1 : 0x0));47}48 49static void50g84_pcie_set_cap_speed(struct nvkm_pci *pci, bool full_speed)51{52 struct nvkm_device *device = pci->subdev.device;53 nvkm_mask(device, 0x00154c, 0x80, full_speed ? 0x80 : 0x0);54}55 56enum nvkm_pcie_speed57g84_pcie_cur_speed(struct nvkm_pci *pci)58{59 u32 reg_v = nvkm_pci_rd32(pci, 0x88) & 0x30000;60 switch (reg_v) {61 case 0x30000:62 return NVKM_PCIE_SPEED_8_0;63 case 0x20000:64 return NVKM_PCIE_SPEED_5_0;65 case 0x10000:66 default:67 return NVKM_PCIE_SPEED_2_5;68 }69}70 71enum nvkm_pcie_speed72g84_pcie_max_speed(struct nvkm_pci *pci)73{74 u32 reg_v = nvkm_pci_rd32(pci, 0x460) & 0x3300;75 if (reg_v == 0x2200)76 return NVKM_PCIE_SPEED_5_0;77 return NVKM_PCIE_SPEED_2_5;78}79 80void81g84_pcie_set_link_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)82{83 u32 mask_value;84 85 if (speed == NVKM_PCIE_SPEED_5_0)86 mask_value = 0x20;87 else88 mask_value = 0x10;89 90 nvkm_pci_mask(pci, 0x460, 0x30, mask_value);91 nvkm_pci_mask(pci, 0x460, 0x1, 0x1);92}93 94int95g84_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width)96{97 g84_pcie_set_cap_speed(pci, speed == NVKM_PCIE_SPEED_5_0);98 g84_pcie_set_link_speed(pci, speed);99 return 0;100}101 102void103g84_pci_init(struct nvkm_pci *pci)104{105 /* The following only concerns PCIe cards. */106 if (!pci_is_pcie(pci->pdev))107 return;108 109 /* Tag field is 8-bit long, regardless of EXT_TAG.110 * However, if EXT_TAG is disabled, only the lower 5 bits of the tag111 * field should be used, limiting the number of request to 32.112 *113 * Apparently, 0x041c stores some limit on the number of requests114 * possible, so if EXT_TAG is disabled, limit that requests number to115 * 32116 *117 * Fixes fdo#86537118 */119 if (nvkm_pci_rd32(pci, 0x007c) & 0x00000020)120 nvkm_pci_mask(pci, 0x0080, 0x00000100, 0x00000100);121 else122 nvkm_pci_mask(pci, 0x041c, 0x00000060, 0x00000000);123}124 125int126g84_pcie_init(struct nvkm_pci *pci)127{128 bool full_speed = g84_pcie_cur_speed(pci) == NVKM_PCIE_SPEED_5_0;129 g84_pcie_set_cap_speed(pci, full_speed);130 return 0;131}132 133static const struct nvkm_pci_func134g84_pci_func = {135 .init = g84_pci_init,136 .rd32 = nv40_pci_rd32,137 .wr08 = nv40_pci_wr08,138 .wr32 = nv40_pci_wr32,139 .msi_rearm = nv46_pci_msi_rearm,140 141 .pcie.init = g84_pcie_init,142 .pcie.set_link = g84_pcie_set_link,143 144 .pcie.max_speed = g84_pcie_max_speed,145 .pcie.cur_speed = g84_pcie_cur_speed,146 147 .pcie.set_version = g84_pcie_set_version,148 .pcie.version = g84_pcie_version,149 .pcie.version_supported = g84_pcie_version_supported,150};151 152int153g84_pci_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,154 struct nvkm_pci **ppci)155{156 return nvkm_pci_new_(&g84_pci_func, device, type, inst, ppci);157}158