1/* 2 * Copyright (c) 2004 Topspin Communications. All rights reserved. 3 * 4 * This software is available to you under a choice of one of two 5 * licenses. You may choose to be licensed under the terms of the GNU 6 * General Public License (GPL) Version 2, available from the file 7 * COPYING in the main directory of this source tree, or the 8 * OpenIB.org BSD license below: 9 * 10 * Redistribution and use in source and binary forms, with or 11 * without modification, are permitted provided that the following 12 * conditions are met: 13 * 14 * - Redistributions of source code must retain the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer. 17 * 18 * - Redistributions in binary form must reproduce the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer in the documentation and/or other materials 21 * provided with the distribution. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 25 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 27 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 28 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 29 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 30 * SOFTWARE. 31 */ 32 33#include <linux/init.h> 34#include <linux/errno.h> 35#include <linux/pci.h> 36#include <linux/delay.h> 37#include <linux/slab.h> 38 39#include "mthca_dev.h" 40#include "mthca_cmd.h" 41 42int mthca_reset(struct mthca_dev *mdev) 43{ 44 int i; 45 int err = 0; 46 u32 *hca_header = NULL; 47 u32 *bridge_header = NULL; 48 struct pci_dev *bridge = NULL; 49 int bridge_pcix_cap = 0; 50 int hca_pcie_cap = 0; 51 int hca_pcix_cap = 0; 52 53 u16 devctl; 54 u16 linkctl; 55 56#define MTHCA_RESET_OFFSET 0xf0010 57#define MTHCA_RESET_VALUE swab32(1) 58 59 /* 60 * Reset the chip. This is somewhat ugly because we have to 61 * save off the PCI header before reset and then restore it 62 * after the chip reboots. We skip config space offsets 22 63 * and 23 since those have a special meaning. 64 * 65 * To make matters worse, for Tavor (PCI-X HCA) we have to 66 * find the associated bridge device and save off its PCI 67 * header as well. 68 */ 69 70 if (!(mdev->mthca_flags & MTHCA_FLAG_PCIE)) { 71 /* Look for the bridge -- its device ID will be 2 more 72 than HCA's device ID. */ 73#ifdef __linux__ 74 while ((bridge = pci_get_device(mdev->pdev->vendor, 75 mdev->pdev->device + 2, 76 bridge)) != NULL) { 77 if (bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE && 78 bridge->subordinate == mdev->pdev->bus) { 79 mthca_dbg(mdev, "Found bridge: %s\n", 80 pci_name(bridge)); 81 break; 82 } 83 } 84 85 if (!bridge) { 86 /* 87 * Didn't find a bridge for a Tavor device -- 88 * assume we're in no-bridge mode and hope for 89 * the best. 90 */ 91 mthca_warn(mdev, "No bridge found for %s\n", 92 pci_name(mdev->pdev)); 93 } 94#else 95 mthca_warn(mdev, "Reset on PCI-X is not supported.\n"); 96 goto out; 97 98#endif 99 } 100 101 /* For Arbel do we need to save off the full 4K PCI Express header?? */ 102 hca_header = kmalloc(256, GFP_KERNEL); 103 if (!hca_header) { 104 err = -ENOMEM; 105 mthca_err(mdev, "Couldn't allocate memory to save HCA " 106 "PCI header, aborting.\n"); 107 goto out; 108 } 109 110 for (i = 0; i < 64; ++i) { 111 if (i == 22 || i == 23) 112 continue; 113 if (pci_read_config_dword(mdev->pdev, i * 4, hca_header + i)) { 114 err = -ENODEV; 115 mthca_err(mdev, "Couldn't save HCA " 116 "PCI header, aborting.\n"); 117 goto out; 118 } 119 } 120 121 hca_pcix_cap = pci_find_capability(mdev->pdev, PCI_CAP_ID_PCIX); 122 hca_pcie_cap = pci_find_capability(mdev->pdev, PCI_CAP_ID_EXP); 123 124#ifdef __linux__ 125 if (bridge) { 126 bridge_header = kmalloc(256, GFP_KERNEL); 127 if (!bridge_header) { 128 err = -ENOMEM; 129 mthca_err(mdev, "Couldn't allocate memory to save HCA " 130 "bridge PCI header, aborting.\n"); 131 goto out; 132 } 133 134 for (i = 0; i < 64; ++i) { 135 if (i == 22 || i == 23) 136 continue; 137 if (pci_read_config_dword(bridge, i * 4, bridge_header + i)) { 138 err = -ENODEV; 139 mthca_err(mdev, "Couldn't save HCA bridge " 140 "PCI header, aborting.\n"); 141 goto out; 142 } 143 } 144 bridge_pcix_cap = pci_find_capability(bridge, PCI_CAP_ID_PCIX); 145 if (!bridge_pcix_cap) { 146 err = -ENODEV; 147 mthca_err(mdev, "Couldn't locate HCA bridge " 148 "PCI-X capability, aborting.\n"); 149 goto out; 150 } 151 } 152#endif 153 154 /* actually hit reset */ 155 { 156 void __iomem *reset = ioremap(pci_resource_start(mdev->pdev, 0) + 157 MTHCA_RESET_OFFSET, 4); 158 159 if (!reset) { 160 err = -ENOMEM; 161 mthca_err(mdev, "Couldn't map HCA reset register, " 162 "aborting.\n"); 163 goto out; 164 } 165 166 writel(MTHCA_RESET_VALUE, reset); 167 iounmap(reset); 168 } 169 170 /* Docs say to wait one second before accessing device */ 171 msleep(1000); 172 173 /* Now wait for PCI device to start responding again */ 174 { 175 u32 v; 176 int c = 0; 177 178 for (c = 0; c < 100; ++c) { 179 if (pci_read_config_dword(bridge ? bridge : mdev->pdev, 0, &v)) { 180 err = -ENODEV; 181 mthca_err(mdev, "Couldn't access HCA after reset, " 182 "aborting.\n"); 183 goto out; 184 } 185 186 if (v != 0xffffffff) 187 goto good; 188 189 msleep(100); 190 } 191 192 err = -ENODEV; 193 mthca_err(mdev, "PCI device did not come back after reset, " 194 "aborting.\n"); 195 goto out; 196 } 197 198good: 199 /* Now restore the PCI headers */ 200 if (bridge) { 201 if (pci_write_config_dword(bridge, bridge_pcix_cap + 0x8, 202 bridge_header[(bridge_pcix_cap + 0x8) / 4])) { 203 err = -ENODEV; 204 mthca_err(mdev, "Couldn't restore HCA bridge Upstream " 205 "split transaction control, aborting.\n"); 206 goto out; 207 } 208 if (pci_write_config_dword(bridge, bridge_pcix_cap + 0xc, 209 bridge_header[(bridge_pcix_cap + 0xc) / 4])) { 210 err = -ENODEV; 211 mthca_err(mdev, "Couldn't restore HCA bridge Downstream " 212 "split transaction control, aborting.\n"); 213 goto out; 214 } 215 /* 216 * Bridge control register is at 0x3e, so we'll 217 * naturally restore it last in this loop. 218 */ 219 for (i = 0; i < 16; ++i) { 220 if (i * 4 == PCI_COMMAND) 221 continue; 222 223 if (pci_write_config_dword(bridge, i * 4, bridge_header[i])) { 224 err = -ENODEV; 225 mthca_err(mdev, "Couldn't restore HCA bridge reg %x, " 226 "aborting.\n", i); 227 goto out; 228 } 229 } 230 231 if (pci_write_config_dword(bridge, PCI_COMMAND, 232 bridge_header[PCI_COMMAND / 4])) { 233 err = -ENODEV; 234 mthca_err(mdev, "Couldn't restore HCA bridge COMMAND, " 235 "aborting.\n"); 236 goto out; 237 } 238 } 239 240 if (hca_pcix_cap) { 241 if (pci_write_config_dword(mdev->pdev, hca_pcix_cap, 242 hca_header[hca_pcix_cap / 4])) { 243 err = -ENODEV; 244 mthca_err(mdev, "Couldn't restore HCA PCI-X " 245 "command register, aborting.\n"); 246 goto out; 247 } 248 } 249 250 if (hca_pcie_cap) { 251 devctl = hca_header[(hca_pcie_cap + PCI_EXP_DEVCTL) / 4]; 252 if (pci_write_config_word(mdev->pdev, hca_pcie_cap + PCI_EXP_DEVCTL, 253 devctl)) { 254 err = -ENODEV; 255 mthca_err(mdev, "Couldn't restore HCA PCI Express " 256 "Device Control register, aborting.\n"); 257 goto out; 258 } 259 linkctl = hca_header[(hca_pcie_cap + PCI_EXP_LNKCTL) / 4]; 260 if (pci_write_config_word(mdev->pdev, hca_pcie_cap + PCI_EXP_LNKCTL, 261 linkctl)) { 262 err = -ENODEV; 263 mthca_err(mdev, "Couldn't restore HCA PCI Express " 264 "Link control register, aborting.\n"); 265 goto out; 266 } 267 } 268 269 for (i = 0; i < 16; ++i) { 270 if (i * 4 == PCI_COMMAND) 271 continue; 272 273 if (pci_write_config_dword(mdev->pdev, i * 4, hca_header[i])) { 274 err = -ENODEV; 275 mthca_err(mdev, "Couldn't restore HCA reg %x, " 276 "aborting.\n", i); 277 goto out; 278 } 279 } 280 281 if (pci_write_config_dword(mdev->pdev, PCI_COMMAND, 282 hca_header[PCI_COMMAND / 4])) { 283 err = -ENODEV; 284 mthca_err(mdev, "Couldn't restore HCA COMMAND, " 285 "aborting.\n"); 286 goto out; 287 } 288 289out: 290#ifdef __linux__ 291 if (bridge) 292 pci_dev_put(bridge); 293#endif 294 kfree(bridge_header); 295 kfree(hca_header); 296 297 return err; 298} 299