289 строки
7.5 KiB
C
289 строки
7.5 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#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;
|
|
int bridge_pcix_cap = 0;
|
|
int hca_pcie_cap = 0;
|
|
int hca_pcix_cap = 0;
|
|
|
|
u16 devctl;
|
|
u16 linkctl;
|
|
|
|
#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;
|
|
}
|
|
}
|
|
|
|
hca_pcix_cap = pci_find_capability(mdev->pdev, PCI_CAP_ID_PCIX);
|
|
hca_pcie_cap = pci_pcie_cap(mdev->pdev);
|
|
|
|
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;
|
|
}
|
|
}
|
|
bridge_pcix_cap = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
|
|
if (!bridge_pcix_cap) {
|
|
err = -ENODEV;
|
|
mthca_err(mdev, "Couldn't locate HCA bridge "
|
|
"PCI-X capability, 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) {
|
|
if (pci_write_config_dword(bridge, bridge_pcix_cap + 0x8,
|
|
bridge_header[(bridge_pcix_cap + 0x8) / 4])) {
|
|
err = -ENODEV;
|
|
mthca_err(mdev, "Couldn't restore HCA bridge Upstream "
|
|
"split transaction control, aborting.\n");
|
|
goto out;
|
|
}
|
|
if (pci_write_config_dword(bridge, bridge_pcix_cap + 0xc,
|
|
bridge_header[(bridge_pcix_cap + 0xc) / 4])) {
|
|
err = -ENODEV;
|
|
mthca_err(mdev, "Couldn't restore HCA bridge Downstream "
|
|
"split transaction control, aborting.\n");
|
|
goto out;
|
|
}
|
|
/*
|
|
* 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;
|
|
}
|
|
}
|
|
|
|
if (hca_pcix_cap) {
|
|
if (pci_write_config_dword(mdev->pdev, hca_pcix_cap,
|
|
hca_header[hca_pcix_cap / 4])) {
|
|
err = -ENODEV;
|
|
mthca_err(mdev, "Couldn't restore HCA PCI-X "
|
|
"command register, aborting.\n");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (hca_pcie_cap) {
|
|
devctl = hca_header[(hca_pcie_cap + PCI_EXP_DEVCTL) / 4];
|
|
if (pcie_capability_write_word(mdev->pdev, PCI_EXP_DEVCTL,
|
|
devctl)) {
|
|
err = -ENODEV;
|
|
mthca_err(mdev, "Couldn't restore HCA PCI Express "
|
|
"Device Control register, aborting.\n");
|
|
goto out;
|
|
}
|
|
linkctl = hca_header[(hca_pcie_cap + PCI_EXP_LNKCTL) / 4];
|
|
if (pcie_capability_write_word(mdev->pdev, PCI_EXP_LNKCTL,
|
|
linkctl)) {
|
|
err = -ENODEV;
|
|
mthca_err(mdev, "Couldn't restore HCA PCI Express "
|
|
"Link control register, 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;
|
|
}
|