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/*
* 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 <linux/slab.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;
}
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