LXR linux/drivers/infiniband/hw/mthca/mthca

   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/errno.h>
  34#include <linux/pci.h>
  35#include <linux/delay.h>
  36#include <linux/slab.h>
  37
  38#include "mthca_dev.h"
  39#include "mthca_cmd.h"
  40
  41int mthca_reset(struct mthca_dev *mdev)
  42{
  43        int i;
  44        int err = 0;
  45        u32 *hca_header    = NULL;
  46        u32 *bridge_header = NULL;
  47        struct pci_dev *bridge = NULL;
  48        int bridge_pcix_cap = 0;
  49        int hca_pcie_cap = 0;
  50        int hca_pcix_cap = 0;
  51
  52        u16 devctl;
  53        u16 linkctl;
  54
  55#define MTHCA_RESET_OFFSET 0xf0010
  56#define MTHCA_RESET_VALUE  swab32(1)
  57
  58        /*
  59         * Reset the chip.  This is somewhat ugly because we have to
  60         * save off the PCI header before reset and then restore it
  61         * after the chip reboots.  We skip config space offsets 22
  62         * and 23 since those have a special meaning.
  63         *
  64         * To make matters worse, for Tavor (PCI-X HCA) we have to
  65         * find the associated bridge device and save off its PCI
  66         * header as well.
  67         */
  68
  69        if (!(mdev->mthca_flags & MTHCA_FLAG_PCIE)) {
  70                /* Look for the bridge -- its device ID will be 2 more
  71                   than HCA's device ID. */
  72                while ((bridge = pci_get_device(mdev->pdev->vendor,
  73                                                mdev->pdev->device + 2,
  74                                                bridge)) != NULL) {
  75                        if (bridge->hdr_type    == PCI_HEADER_TYPE_BRIDGE &&
  76                            bridge->subordinate == mdev->pdev->bus) {
  77                                mthca_dbg(mdev, "Found bridge: %s\n",
  78                                          pci_name(bridge));
  79                                break;
  80                        }
  81                }
  82
  83                if (!bridge) {
  84                        /*
  85                         * Didn't find a bridge for a Tavor device --
  86                         * assume we're in no-bridge mode and hope for
  87                         * the best.
  88                         */
  89                        mthca_warn(mdev, "No bridge found for %s\n",
  90                                  pci_name(mdev->pdev));
  91                }
  92
  93        }
  94
  95        /* For Arbel do we need to save off the full 4K PCI Express header?? */
  96        hca_header = kmalloc(256, GFP_KERNEL);
  97        if (!hca_header) {
  98                err = -ENOMEM;
  99                mthca_err(mdev, "Couldn't allocate memory to save HCA "
 100                          "PCI header, aborting.\n");
 101                goto out;
 102        }
 103
 104        for (i = 0; i < 64; ++i) {
 105                if (i == 22 || i == 23)
 106                        continue;
 107                if (pci_read_config_dword(mdev->pdev, i * 4, hca_header + i)) {
 108                        err = -ENODEV;
 109                        mthca_err(mdev, "Couldn't save HCA "
 110                                  "PCI header, aborting.\n");
 111                        goto out;
 112                }
 113        }
 114
 115        hca_pcix_cap = pci_find_capability(mdev->pdev, PCI_CAP_ID_PCIX);
 116        hca_pcie_cap = pci_pcie_cap(mdev->pdev);
 117
 118        if (bridge) {
 119                bridge_header = kmalloc(256, GFP_KERNEL);
 120                if (!bridge_header) {
 121                        err = -ENOMEM;
 122                        mthca_err(mdev, "Couldn't allocate memory to save HCA "
 123                                  "bridge PCI header, aborting.\n");
 124                        goto out;
 125                }
 126
 127                for (i = 0; i < 64; ++i) {
 128                        if (i == 22 || i == 23)
 129                                continue;
 130                        if (pci_read_config_dword(bridge, i * 4, bridge_header + i)) {
 131                                err = -ENODEV;
 132                                mthca_err(mdev, "Couldn't save HCA bridge "
 133                                          "PCI header, aborting.\n");
 134                                goto out;
 135                        }
 136                }
 137                bridge_pcix_cap = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
 138                if (!bridge_pcix_cap) {
 139                                err = -ENODEV;
 140                                mthca_err(mdev, "Couldn't locate HCA bridge "
 141                                          "PCI-X capability, aborting.\n");
 142                                goto out;
 143                }
 144        }
 145
 146        /* actually hit reset */
 147        {
 148                void __iomem *reset = ioremap(pci_resource_start(mdev->pdev, 0) +
 149                                              MTHCA_RESET_OFFSET, 4);
 150
 151                if (!reset) {
 152                        err = -ENOMEM;
 153                        mthca_err(mdev, "Couldn't map HCA reset register, "
 154                                  "aborting.\n");
 155                        goto out;
 156                }
 157
 158                writel(MTHCA_RESET_VALUE, reset);
 159                iounmap(reset);
 160        }
 161
 162        /* Docs say to wait one second before accessing device */
 163        msleep(1000);
 164
 165        /* Now wait for PCI device to start responding again */
 166        {
 167                u32 v;
 168                int c = 0;
 169
 170                for (c = 0; c < 100; ++c) {
 171                        if (pci_read_config_dword(bridge ? bridge : mdev->pdev, 0, &v)) {
 172                                err = -ENODEV;
 173                                mthca_err(mdev, "Couldn't access HCA after reset, "
 174                                          "aborting.\n");
 175                                goto out;
 176                        }
 177
 178                        if (v != 0xffffffff)
 179                                goto good;
 180
 181                        msleep(100);
 182                }
 183
 184                err = -ENODEV;
 185                mthca_err(mdev, "PCI device did not come back after reset, "
 186                          "aborting.\n");
 187                goto out;
 188        }
 189
 190good:
 191        /* Now restore the PCI headers */
 192        if (bridge) {
 193                if (pci_write_config_dword(bridge, bridge_pcix_cap + 0x8,
 194                                 bridge_header[(bridge_pcix_cap + 0x8) / 4])) {
 195                        err = -ENODEV;
 196                        mthca_err(mdev, "Couldn't restore HCA bridge Upstream "
 197                                  "split transaction control, aborting.\n");
 198                        goto out;
 199                }
 200                if (pci_write_config_dword(bridge, bridge_pcix_cap + 0xc,
 201                                 bridge_header[(bridge_pcix_cap + 0xc) / 4])) {
 202                        err = -ENODEV;
 203                        mthca_err(mdev, "Couldn't restore HCA bridge Downstream "
 204                                  "split transaction control, aborting.\n");
 205                        goto out;
 206                }
 207                /*
 208                 * Bridge control register is at 0x3e, so we'll
 209                 * naturally restore it last in this loop.
 210                 */
 211                for (i = 0; i < 16; ++i) {
 212                        if (i * 4 == PCI_COMMAND)
 213                                continue;
 214
 215                        if (pci_write_config_dword(bridge, i * 4, bridge_header[i])) {
 216                                err = -ENODEV;
 217                                mthca_err(mdev, "Couldn't restore HCA bridge reg %x, "
 218                                          "aborting.\n", i);
 219                                goto out;
 220                        }
 221                }
 222
 223                if (pci_write_config_dword(bridge, PCI_COMMAND,
 224                                           bridge_header[PCI_COMMAND / 4])) {
 225                        err = -ENODEV;
 226                        mthca_err(mdev, "Couldn't restore HCA bridge COMMAND, "
 227                                  "aborting.\n");
 228                        goto out;
 229                }
 230        }
 231
 232        if (hca_pcix_cap) {
 233                if (pci_write_config_dword(mdev->pdev, hca_pcix_cap,
 234                                 hca_header[hca_pcix_cap / 4])) {
 235                        err = -ENODEV;
 236                        mthca_err(mdev, "Couldn't restore HCA PCI-X "
 237                                  "command register, aborting.\n");
 238                        goto out;
 239                }
 240        }
 241
 242        if (hca_pcie_cap) {
 243                devctl = hca_header[(hca_pcie_cap + PCI_EXP_DEVCTL) / 4];
 244                if (pcie_capability_write_word(mdev->pdev, PCI_EXP_DEVCTL,
 245                                               devctl)) {
 246                        err = -ENODEV;
 247                        mthca_err(mdev, "Couldn't restore HCA PCI Express "
 248                                  "Device Control register, aborting.\n");
 249                        goto out;
 250                }
 251                linkctl = hca_header[(hca_pcie_cap + PCI_EXP_LNKCTL) / 4];
 252                if (pcie_capability_write_word(mdev->pdev, PCI_EXP_LNKCTL,
 253                                               linkctl)) {
 254                        err = -ENODEV;
 255                        mthca_err(mdev, "Couldn't restore HCA PCI Express "
 256                                  "Link control register, aborting.\n");
 257                        goto out;
 258                }
 259        }
 260
 261        for (i = 0; i < 16; ++i) {
 262                if (i * 4 == PCI_COMMAND)
 263                        continue;
 264
 265                if (pci_write_config_dword(mdev->pdev, i * 4, hca_header[i])) {
 266                        err = -ENODEV;
 267                        mthca_err(mdev, "Couldn't restore HCA reg %x, "
 268                                  "aborting.\n", i);
 269                        goto out;
 270                }
 271        }
 272
 273        if (pci_write_config_dword(mdev->pdev, PCI_COMMAND,
 274                                   hca_header[PCI_COMMAND / 4])) {
 275                err = -ENODEV;
 276                mthca_err(mdev, "Couldn't restore HCA COMMAND, "
 277                          "aborting.\n");
 278                goto out;
 279        }
 280
 281out:
 282        if (bridge)
 283                pci_dev_put(bridge);
 284        kfree(bridge_header);
 285        kfree(hca_header);
 286
 287        return err;
 288}
 289