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 goto put_dev; 100 } 101 102 for (i = 0; i < 64; ++i) { 103 if (i == 22 || i == 23) 104 continue; 105 if (pci_read_config_dword(mdev->pdev, i * 4, hca_header + i)) { 106 err = -ENODEV; 107 mthca_err(mdev, "Couldn't save HCA " 108 "PCI header, aborting.\n"); 109 goto free_hca; 110 } 111 } 112 113 hca_pcix_cap = pci_find_capability(mdev->pdev, PCI_CAP_ID_PCIX); 114 hca_pcie_cap = pci_pcie_cap(mdev->pdev); 115 116 if (bridge) { 117 bridge_header = kmalloc(256, GFP_KERNEL); 118 if (!bridge_header) { 119 err = -ENOMEM; 120 goto free_hca; 121 } 122 123 for (i = 0; i < 64; ++i) { 124 if (i == 22 || i == 23) 125 continue; 126 if (pci_read_config_dword(bridge, i * 4, bridge_header + i)) { 127 err = -ENODEV; 128 mthca_err(mdev, "Couldn't save HCA bridge " 129 "PCI header, aborting.\n"); 130 goto free_bh; 131 } 132 } 133 bridge_pcix_cap = pci_find_capability(bridge, PCI_CAP_ID_PCIX); 134 if (!bridge_pcix_cap) { 135 err = -ENODEV; 136 mthca_err(mdev, "Couldn't locate HCA bridge " 137 "PCI-X capability, aborting.\n"); 138 goto free_bh; 139 } 140 } 141 142 /* actually hit reset */ 143 { 144 void __iomem *reset = ioremap(pci_resource_start(mdev->pdev, 0) + 145 MTHCA_RESET_OFFSET, 4); 146 147 if (!reset) { 148 err = -ENOMEM; 149 mthca_err(mdev, "Couldn't map HCA reset register, " 150 "aborting.\n"); 151 goto free_bh; 152 } 153 154 writel(MTHCA_RESET_VALUE, reset); 155 iounmap(reset); 156 } 157 158 /* Docs say to wait one second before accessing device */ 159 msleep(1000); 160 161 /* Now wait for PCI device to start responding again */ 162 { 163 u32 v; 164 int c = 0; 165 166 for (c = 0; c < 100; ++c) { 167 if (pci_read_config_dword(bridge ? bridge : mdev->pdev, 0, &v)) { 168 err = -ENODEV; 169 mthca_err(mdev, "Couldn't access HCA after reset, " 170 "aborting.\n"); 171 goto free_bh; 172 } 173 174 if (v != 0xffffffff) 175 goto good; 176 177 msleep(100); 178 } 179 180 err = -ENODEV; 181 mthca_err(mdev, "PCI device did not come back after reset, " 182 "aborting.\n"); 183 goto free_bh; 184 } 185 186good: 187 /* Now restore the PCI headers */ 188 if (bridge) { 189 if (pci_write_config_dword(bridge, bridge_pcix_cap + 0x8, 190 bridge_header[(bridge_pcix_cap + 0x8) / 4])) { 191 err = -ENODEV; 192 mthca_err(mdev, "Couldn't restore HCA bridge Upstream " 193 "split transaction control, aborting.\n"); 194 goto free_bh; 195 } 196 if (pci_write_config_dword(bridge, bridge_pcix_cap + 0xc, 197 bridge_header[(bridge_pcix_cap + 0xc) / 4])) { 198 err = -ENODEV; 199 mthca_err(mdev, "Couldn't restore HCA bridge Downstream " 200 "split transaction control, aborting.\n"); 201 goto free_bh; 202 } 203 /* 204 * Bridge control register is at 0x3e, so we'll 205 * naturally restore it last in this loop. 206 */ 207 for (i = 0; i < 16; ++i) { 208 if (i * 4 == PCI_COMMAND) 209 continue; 210 211 if (pci_write_config_dword(bridge, i * 4, bridge_header[i])) { 212 err = -ENODEV; 213 mthca_err(mdev, "Couldn't restore HCA bridge reg %x, " 214 "aborting.\n", i); 215 goto free_bh; 216 } 217 } 218 219 if (pci_write_config_dword(bridge, PCI_COMMAND, 220 bridge_header[PCI_COMMAND / 4])) { 221 err = -ENODEV; 222 mthca_err(mdev, "Couldn't restore HCA bridge COMMAND, " 223 "aborting.\n"); 224 goto free_bh; 225 } 226 } 227 228 if (hca_pcix_cap) { 229 if (pci_write_config_dword(mdev->pdev, hca_pcix_cap, 230 hca_header[hca_pcix_cap / 4])) { 231 err = -ENODEV; 232 mthca_err(mdev, "Couldn't restore HCA PCI-X " 233 "command register, aborting.\n"); 234 goto free_bh; 235 } 236 } 237 238 if (hca_pcie_cap) { 239 devctl = hca_header[(hca_pcie_cap + PCI_EXP_DEVCTL) / 4]; 240 if (pcie_capability_write_word(mdev->pdev, PCI_EXP_DEVCTL, 241 devctl)) { 242 err = -ENODEV; 243 mthca_err(mdev, "Couldn't restore HCA PCI Express " 244 "Device Control register, aborting.\n"); 245 goto free_bh; 246 } 247 linkctl = hca_header[(hca_pcie_cap + PCI_EXP_LNKCTL) / 4]; 248 if (pcie_capability_write_word(mdev->pdev, PCI_EXP_LNKCTL, 249 linkctl)) { 250 err = -ENODEV; 251 mthca_err(mdev, "Couldn't restore HCA PCI Express " 252 "Link control register, aborting.\n"); 253 goto free_bh; 254 } 255 } 256 257 for (i = 0; i < 16; ++i) { 258 if (i * 4 == PCI_COMMAND) 259 continue; 260 261 if (pci_write_config_dword(mdev->pdev, i * 4, hca_header[i])) { 262 err = -ENODEV; 263 mthca_err(mdev, "Couldn't restore HCA reg %x, " 264 "aborting.\n", i); 265 goto free_bh; 266 } 267 } 268 269 if (pci_write_config_dword(mdev->pdev, PCI_COMMAND, 270 hca_header[PCI_COMMAND / 4])) { 271 err = -ENODEV; 272 mthca_err(mdev, "Couldn't restore HCA COMMAND, " 273 "aborting.\n"); 274 } 275free_bh: 276 kfree(bridge_header); 277free_hca: 278 kfree(hca_header); 279put_dev: 280 pci_dev_put(bridge); 281 return err; 282} 283