Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 232 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_reset.c b/drivers/infiniband/hw/mthca/mthca_reset.c
new file mode 100644
index 000000000000..ce3fff7d02b7
--- /dev/null
+++ b/drivers/infiniband/hw/mthca/mthca_reset.c
@@ -0,0 +1,232 @@
+/*
+ * 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->hca_type == TAVOR) {
+                /* 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 (%s)\n",
+                                          pci_pretty_name(bridge), 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 (%s)\n",
+                                  pci_pretty_name(mdev->pdev), 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;
+}