summaryrefslogtreecommitdiffstats
path: root/drivers/infiniband/hw/mthca/mthca_reset.c
blob: 4f995391dd1d8176e7ff0cc25f4ac5b049288ae3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
/*
 * Copyright (c) 2004 Topspin Communications.  All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: mthca_reset.c 1349 2004-12-16 21:09:43Z roland $
 */

#include <linux/config.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/delay.h>

#include "mthca_dev.h"
#include "mthca_cmd.h"

int mthca_reset(struct mthca_dev *mdev)
{
	int i;
	int err = 0;
	u32 *hca_header    = NULL;
	u32 *bridge_header = NULL;
	struct pci_dev *bridge = NULL;

#define MTHCA_RESET_OFFSET 0xf0010
#define MTHCA_RESET_VALUE  swab32(1)

	/*
	 * Reset the chip.  This is somewhat ugly because we have to
	 * save off the PCI header before reset and then restore it
	 * after the chip reboots.  We skip config space offsets 22
	 * and 23 since those have a special meaning.
	 *
	 * To make matters worse, for Tavor (PCI-X HCA) we have to
	 * find the associated bridge device and save off its PCI
	 * header as well.
	 */

	if (!(mdev->mthca_flags & MTHCA_FLAG_PCIE)) {
		/* Look for the bridge -- its device ID will be 2 more
		   than HCA's device ID. */
		while ((bridge = pci_get_device(mdev->pdev->vendor,
						mdev->pdev->device + 2,
						bridge)) != NULL) {
			if (bridge->hdr_type    == PCI_HEADER_TYPE_BRIDGE &&
			    bridge->subordinate == mdev->pdev->bus) {
				mthca_dbg(mdev, "Found bridge: %s\n",
					  pci_name(bridge));
				break;
			}
		}

		if (!bridge) {
			/*
			 * Didn't find a bridge for a Tavor device --
			 * assume we're in no-bridge mode and hope for
			 * the best.
			 */
			mthca_warn(mdev, "No bridge found for %s\n",
				  pci_name(mdev->pdev));
		}

	}

	/* For Arbel do we need to save off the full 4K PCI Express header?? */
	hca_header = kmalloc(256, GFP_KERNEL);
	if (!hca_header) {
		err = -ENOMEM;
		mthca_err(mdev, "Couldn't allocate memory to save HCA "
			  "PCI header, aborting.\n");
		goto out;
	}

	for (i = 0; i < 64; ++i) {
		if (i == 22 || i == 23)
			continue;
		if (pci_read_config_dword(mdev->pdev, i * 4, hca_header + i)) {
			err = -ENODEV;
			mthca_err(mdev, "Couldn't save HCA "
				  "PCI header, aborting.\n");
			goto out;
		}
	}

	if (bridge) {
		bridge_header = kmalloc(256, GFP_KERNEL);
		if (!bridge_header) {
			err = -ENOMEM;
			mthca_err(mdev, "Couldn't allocate memory to save HCA "
				  "bridge PCI header, aborting.\n");
			goto out;
		}

		for (i = 0; i < 64; ++i) {
			if (i == 22 || i == 23)
				continue;
			if (pci_read_config_dword(bridge, i * 4, bridge_header + i)) {
				err = -ENODEV;
				mthca_err(mdev, "Couldn't save HCA bridge "
					  "PCI header, aborting.\n");
				goto out;
			}
		}
	}

	/* actually hit reset */
	{
		void __iomem *reset = ioremap(pci_resource_start(mdev->pdev, 0) +
					      MTHCA_RESET_OFFSET, 4);

		if (!reset) {
			err = -ENOMEM;
			mthca_err(mdev, "Couldn't map HCA reset register, "
				  "aborting.\n");
			goto out;
		}

		writel(MTHCA_RESET_VALUE, reset);
		iounmap(reset);
	}

	/* Docs say to wait one second before accessing device */
	msleep(1000);

	/* Now wait for PCI device to start responding again */
	{
		u32 v;
		int c = 0;

		for (c = 0; c < 100; ++c) {
			if (pci_read_config_dword(bridge ? bridge : mdev->pdev, 0, &v)) {
				err = -ENODEV;
				mthca_err(mdev, "Couldn't access HCA after reset, "
					  "aborting.\n");
				goto out;
			}

			if (v != 0xffffffff)
				goto good;

			msleep(100);
		}

		err = -ENODEV;
		mthca_err(mdev, "PCI device did not come back after reset, "
			  "aborting.\n");
		goto out;
	}

good:
	/* Now restore the PCI headers */
	if (bridge) {
		/*
		 * Bridge control register is at 0x3e, so we'll
		 * naturally restore it last in this loop.
		 */
		for (i = 0; i < 16; ++i) {
			if (i * 4 == PCI_COMMAND)
				continue;

			if (pci_write_config_dword(bridge, i * 4, bridge_header[i])) {
				err = -ENODEV;
				mthca_err(mdev, "Couldn't restore HCA bridge reg %x, "
					  "aborting.\n", i);
				goto out;
			}
		}

		if (pci_write_config_dword(bridge, PCI_COMMAND,
					   bridge_header[PCI_COMMAND / 4])) {
			err = -ENODEV;
			mthca_err(mdev, "Couldn't restore HCA bridge COMMAND, "
				  "aborting.\n");
			goto out;
		}
	}

	for (i = 0; i < 16; ++i) {
		if (i * 4 == PCI_COMMAND)
			continue;

		if (pci_write_config_dword(mdev->pdev, i * 4, hca_header[i])) {
			err = -ENODEV;
			mthca_err(mdev, "Couldn't restore HCA reg %x, "
				  "aborting.\n", i);
			goto out;
		}
	}

	if (pci_write_config_dword(mdev->pdev, PCI_COMMAND,
				   hca_header[PCI_COMMAND / 4])) {
		err = -ENODEV;
		mthca_err(mdev, "Couldn't restore HCA COMMAND, "
			  "aborting.\n");
		goto out;
	}

out:
	if (bridge)
		pci_dev_put(bridge);
	kfree(bridge_header);
	kfree(hca_header);

	return err;
}
OpenPOWER on IntegriCloud