2 * Copyright (c) 2004 Topspin Communications. All rights reserved.
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:
10 * Redistribution and use in source and binary forms, with or
11 * without modification, are permitted provided that the following
14 * - Redistributions of source code must retain the above
15 * copyright notice, this list of conditions and the following
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.
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
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>
39 #include "mthca_dev.h"
40 #include "mthca_cmd.h"
42 int mthca_reset(struct mthca_dev *mdev)
46 u32 *hca_header = NULL;
47 u32 *bridge_header = NULL;
48 struct pci_dev *bridge = NULL;
49 int bridge_pcix_cap = 0;
56 #define MTHCA_RESET_OFFSET 0xf0010
57 #define MTHCA_RESET_VALUE swab32(1)
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.
65 * To make matters worse, for Tavor (PCI-X HCA) we have to
66 * find the associated bridge device and save off its PCI
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. */
74 while ((bridge = pci_get_device(mdev->pdev->vendor,
75 mdev->pdev->device + 2,
77 if (bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE &&
78 bridge->subordinate == mdev->pdev->bus) {
79 mthca_dbg(mdev, "Found bridge: %s\n",
87 * Didn't find a bridge for a Tavor device --
88 * assume we're in no-bridge mode and hope for
91 mthca_warn(mdev, "No bridge found for %s\n",
92 pci_name(mdev->pdev));
95 mthca_warn(mdev, "Reset on PCI-X is not supported.\n");
101 /* For Arbel do we need to save off the full 4K PCI Express header?? */
102 hca_header = kmalloc(256, GFP_KERNEL);
105 mthca_err(mdev, "Couldn't allocate memory to save HCA "
106 "PCI header, aborting.\n");
110 for (i = 0; i < 64; ++i) {
111 if (i == 22 || i == 23)
113 if (pci_read_config_dword(mdev->pdev, i * 4, hca_header + i)) {
115 mthca_err(mdev, "Couldn't save HCA "
116 "PCI header, aborting.\n");
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);
126 bridge_header = kmalloc(256, GFP_KERNEL);
127 if (!bridge_header) {
129 mthca_err(mdev, "Couldn't allocate memory to save HCA "
130 "bridge PCI header, aborting.\n");
134 for (i = 0; i < 64; ++i) {
135 if (i == 22 || i == 23)
137 if (pci_read_config_dword(bridge, i * 4, bridge_header + i)) {
139 mthca_err(mdev, "Couldn't save HCA bridge "
140 "PCI header, aborting.\n");
144 bridge_pcix_cap = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
145 if (!bridge_pcix_cap) {
147 mthca_err(mdev, "Couldn't locate HCA bridge "
148 "PCI-X capability, aborting.\n");
154 /* actually hit reset */
156 void __iomem *reset = ioremap(pci_resource_start(mdev->pdev, 0) +
157 MTHCA_RESET_OFFSET, 4);
161 mthca_err(mdev, "Couldn't map HCA reset register, "
166 writel(MTHCA_RESET_VALUE, reset);
170 /* Docs say to wait one second before accessing device */
173 /* Now wait for PCI device to start responding again */
178 for (c = 0; c < 100; ++c) {
179 if (pci_read_config_dword(bridge ? bridge : mdev->pdev, 0, &v)) {
181 mthca_err(mdev, "Couldn't access HCA after reset, "
193 mthca_err(mdev, "PCI device did not come back after reset, "
199 /* Now restore the PCI headers */
201 if (pci_write_config_dword(bridge, bridge_pcix_cap + 0x8,
202 bridge_header[(bridge_pcix_cap + 0x8) / 4])) {
204 mthca_err(mdev, "Couldn't restore HCA bridge Upstream "
205 "split transaction control, aborting.\n");
208 if (pci_write_config_dword(bridge, bridge_pcix_cap + 0xc,
209 bridge_header[(bridge_pcix_cap + 0xc) / 4])) {
211 mthca_err(mdev, "Couldn't restore HCA bridge Downstream "
212 "split transaction control, aborting.\n");
216 * Bridge control register is at 0x3e, so we'll
217 * naturally restore it last in this loop.
219 for (i = 0; i < 16; ++i) {
220 if (i * 4 == PCI_COMMAND)
223 if (pci_write_config_dword(bridge, i * 4, bridge_header[i])) {
225 mthca_err(mdev, "Couldn't restore HCA bridge reg %x, "
231 if (pci_write_config_dword(bridge, PCI_COMMAND,
232 bridge_header[PCI_COMMAND / 4])) {
234 mthca_err(mdev, "Couldn't restore HCA bridge COMMAND, "
241 if (pci_write_config_dword(mdev->pdev, hca_pcix_cap,
242 hca_header[hca_pcix_cap / 4])) {
244 mthca_err(mdev, "Couldn't restore HCA PCI-X "
245 "command register, aborting.\n");
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,
255 mthca_err(mdev, "Couldn't restore HCA PCI Express "
256 "Device Control register, aborting.\n");
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,
263 mthca_err(mdev, "Couldn't restore HCA PCI Express "
264 "Link control register, aborting.\n");
269 for (i = 0; i < 16; ++i) {
270 if (i * 4 == PCI_COMMAND)
273 if (pci_write_config_dword(mdev->pdev, i * 4, hca_header[i])) {
275 mthca_err(mdev, "Couldn't restore HCA reg %x, "
281 if (pci_write_config_dword(mdev->pdev, PCI_COMMAND,
282 hca_header[PCI_COMMAND / 4])) {
284 mthca_err(mdev, "Couldn't restore HCA COMMAND, "
294 kfree(bridge_header);