1 files changed, 181 insertions, 0 deletions

diff --git a/drivers/net/mlx4/reset.c b/drivers/net/mlx4/reset.c
new file mode 100644
index 000000000000..51eef8492e93
--- /dev/null
+++ b/drivers/net/mlx4/reset.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2006, 2007 Cisco Systems, Inc.  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/init.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#include "mlx4.h"
+
+int mlx4_reset(struct mlx4_dev *dev)
+{
+        void __iomem *reset;
+        u32 *hca_header = NULL;
+        int pcie_cap;
+        u16 devctl;
+        u16 linkctl;
+        u16 vendor;
+        unsigned long end;
+        u32 sem;
+        int i;
+        int err = 0;
+
+#define MLX4_RESET_BASE         0xf0000
+#define MLX4_RESET_SIZE           0x400
+#define MLX4_SEM_OFFSET           0x3fc
+#define MLX4_RESET_OFFSET          0x10
+#define MLX4_RESET_VALUE        swab32(1)
+
+#define MLX4_SEM_TIMEOUT_JIFFIES        (10 * HZ)
+#define MLX4_RESET_TIMEOUT_JIFFIES      (2 * HZ)
+
+        /*
+         * 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.
+         */
+
+        /* Do we need to save off the full 4K PCI Express header?? */
+        hca_header = kmalloc(256, GFP_KERNEL);
+        if (!hca_header) {
+                err = -ENOMEM;
+                mlx4_err(dev, "Couldn't allocate memory to save HCA "
+                          "PCI header, aborting.\n");
+                goto out;
+        }
+
+        pcie_cap = pci_find_capability(dev->pdev, PCI_CAP_ID_EXP);
+
+        for (i = 0; i < 64; ++i) {
+                if (i == 22 || i == 23)
+                        continue;
+                if (pci_read_config_dword(dev->pdev, i * 4, hca_header + i)) {
+                        err = -ENODEV;
+                        mlx4_err(dev, "Couldn't save HCA "
+                                  "PCI header, aborting.\n");
+                        goto out;
+                }
+        }
+
+        reset = ioremap(pci_resource_start(dev->pdev, 0) + MLX4_RESET_BASE,
+                        MLX4_RESET_SIZE);
+        if (!reset) {
+                err = -ENOMEM;
+                mlx4_err(dev, "Couldn't map HCA reset register, aborting.\n");
+                goto out;
+        }
+
+        /* grab HW semaphore to lock out flash updates */
+        end = jiffies + MLX4_SEM_TIMEOUT_JIFFIES;
+        do {
+                sem = readl(reset + MLX4_SEM_OFFSET);
+                if (!sem)
+                        break;
+
+                msleep(1);
+        } while (time_before(jiffies, end));
+
+        if (sem) {
+                mlx4_err(dev, "Failed to obtain HW semaphore, aborting\n");
+                err = -EAGAIN;
+                iounmap(reset);
+                goto out;
+        }
+
+        /* actually hit reset */
+        writel(MLX4_RESET_VALUE, reset + MLX4_RESET_OFFSET);
+        iounmap(reset);
+
+        end = jiffies + MLX4_RESET_TIMEOUT_JIFFIES;
+        do {
+                if (!pci_read_config_word(dev->pdev, PCI_VENDOR_ID, &vendor) &&
+                    vendor != 0xffff)
+                        break;
+
+                msleep(1);
+        } while (time_before(jiffies, end));
+
+        if (vendor == 0xffff) {
+                err = -ENODEV;
+                mlx4_err(dev, "PCI device did not come back after reset, "
+                          "aborting.\n");
+                goto out;
+        }
+
+        /* Now restore the PCI headers */
+        if (pcie_cap) {
+                devctl = hca_header[(pcie_cap + PCI_EXP_DEVCTL) / 4];
+                if (pci_write_config_word(dev->pdev, pcie_cap + PCI_EXP_DEVCTL,
+                                           devctl)) {
+                        err = -ENODEV;
+                        mlx4_err(dev, "Couldn't restore HCA PCI Express "
+                                 "Device Control register, aborting.\n");
+                        goto out;
+                }
+                linkctl = hca_header[(pcie_cap + PCI_EXP_LNKCTL) / 4];
+                if (pci_write_config_word(dev->pdev, pcie_cap + PCI_EXP_LNKCTL,
+                                           linkctl)) {
+                        err = -ENODEV;
+                        mlx4_err(dev, "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(dev->pdev, i * 4, hca_header[i])) {
+                        err = -ENODEV;
+                        mlx4_err(dev, "Couldn't restore HCA reg %x, "
+                                  "aborting.\n", i);
+                        goto out;
+                }
+        }
+
+        if (pci_write_config_dword(dev->pdev, PCI_COMMAND,
+                                   hca_header[PCI_COMMAND / 4])) {
+                err = -ENODEV;
+                mlx4_err(dev, "Couldn't restore HCA COMMAND, "
+                          "aborting.\n");
+                goto out;
+        }
+
+out:
+        kfree(hca_header);
+
+        return err;
+}