mlx4_reset.c

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    1 /*
    2  * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
    3  * Copyright (c) 2007, 2008, 2014 Mellanox Technologies. All rights reserved.
    4  *
    5  * This software is available to you under a choice of one of two
    6  * licenses.  You may choose to be licensed under the terms of the GNU
    7  * General Public License (GPL) Version 2, available from the file
    8  * COPYING in the main directory of this source tree, or the
    9  * OpenIB.org BSD license below:
   10  *
   11  *     Redistribution and use in source and binary forms, with or
   12  *     without modification, are permitted provided that the following
   13  *     conditions are met:
   14  *
   15  *      - Redistributions of source code must retain the above
   16  *        copyright notice, this list of conditions and the following
   17  *        disclaimer.
   18  *
   19  *      - Redistributions in binary form must reproduce the above
   20  *        copyright notice, this list of conditions and the following
   21  *        disclaimer in the documentation and/or other materials
   22  *        provided with the distribution.
   23  *
   24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   31  * SOFTWARE.
   32  */
   33 
   34 #include <linux/errno.h>
   35 #include <linux/pci.h>
   36 #include <linux/delay.h>
   37 #include <linux/slab.h>
   38 #include <linux/jiffies.h>
   39 
   40 #include "mlx4.h"
   41 
   42 int mlx4_reset(struct mlx4_dev *dev)
   43 {
   44         void __iomem *reset;
   45         u32 *hca_header = NULL;
   46         int pcie_cap;
   47         u16 devctl;
   48         u16 linkctl;
   49         u16 vendor;
   50         unsigned long end;
   51         u32 sem;
   52         int i;
   53         int err = 0;
   54 
   55 #define MLX4_RESET_BASE         0xf0000
   56 #define MLX4_RESET_SIZE           0x400
   57 #define MLX4_SEM_OFFSET           0x3fc
   58 #define MLX4_RESET_OFFSET          0x10
   59 #define MLX4_RESET_VALUE        swab32(1)
   60 
   61 #define MLX4_SEM_TIMEOUT_JIFFIES        (10 * HZ)
   62 #define MLX4_RESET_TIMEOUT_JIFFIES      (2 * HZ)
   63 
   64         /*
   65          * Reset the chip.  This is somewhat ugly because we have to
   66          * save off the PCI header before reset and then restore it
   67          * after the chip reboots.  We skip config space offsets 22
   68          * and 23 since those have a special meaning.
   69          */
   70 
   71         /* Do we need to save off the full 4K PCI Express header?? */
   72         hca_header = kmalloc(256, GFP_KERNEL);
   73         if (!hca_header) {
   74                 err = -ENOMEM;
   75                 mlx4_err(dev, "Couldn't allocate memory to save HCA PCI header, aborting\n");
   76                 goto out;
   77         }
   78 
   79         pcie_cap = pci_pcie_cap(dev->persist->pdev);
   80 
   81         for (i = 0; i < 64; ++i) {
   82                 if (i == 22 || i == 23)
   83                         continue;
   84                 if (pci_read_config_dword(dev->persist->pdev, i * 4,
   85                                           hca_header + i)) {
   86                         err = -ENODEV;
   87                         mlx4_err(dev, "Couldn't save HCA PCI header, aborting\n");
   88                         goto out;
   89                 }
   90         }
   91 
   92         reset = ioremap(pci_resource_start(dev->persist->pdev, 0) +
   93                         MLX4_RESET_BASE,
   94                         MLX4_RESET_SIZE);
   95         if (!reset) {
   96                 err = -ENOMEM;
   97                 mlx4_err(dev, "Couldn't map HCA reset register, aborting\n");
   98                 goto out;
   99         }
  100 
  101         /* grab HW semaphore to lock out flash updates */
  102         end = jiffies + MLX4_SEM_TIMEOUT_JIFFIES;
  103         do {
  104                 sem = readl(reset + MLX4_SEM_OFFSET);
  105                 if (!sem)
  106                         break;
  107 
  108                 msleep(1);
  109         } while (time_before(jiffies, end));
  110 
  111         if (sem) {
  112                 mlx4_err(dev, "Failed to obtain HW semaphore, aborting\n");
  113                 err = -EAGAIN;
  114                 iounmap(reset);
  115                 goto out;
  116         }
  117 
  118         /* actually hit reset */
  119         writel(MLX4_RESET_VALUE, reset + MLX4_RESET_OFFSET);
  120         iounmap(reset);
  121 
  122         /* Docs say to wait one second before accessing device */
  123         msleep(1000);
  124 
  125         end = jiffies + MLX4_RESET_TIMEOUT_JIFFIES;
  126         do {
  127                 if (!pci_read_config_word(dev->persist->pdev, PCI_VENDOR_ID,
  128                                           &vendor) && vendor != 0xffff)
  129                         break;
  130 
  131                 msleep(1);
  132         } while (time_before(jiffies, end));
  133 
  134         if (vendor == 0xffff) {
  135                 err = -ENODEV;
  136                 mlx4_err(dev, "PCI device did not come back after reset, aborting\n");
  137                 goto out;
  138         }
  139 
  140         /* Now restore the PCI headers */
  141         if (pcie_cap) {
  142                 devctl = hca_header[(pcie_cap + PCI_EXP_DEVCTL) / 4];
  143                 if (pcie_capability_write_word(dev->persist->pdev,
  144                                                PCI_EXP_DEVCTL,
  145                                                devctl)) {
  146                         err = -ENODEV;
  147                         mlx4_err(dev, "Couldn't restore HCA PCI Express Device Control register, aborting\n");
  148                         goto out;
  149                 }
  150                 linkctl = hca_header[(pcie_cap + PCI_EXP_LNKCTL) / 4];
  151                 if (pcie_capability_write_word(dev->persist->pdev,
  152                                                PCI_EXP_LNKCTL,
  153                                                linkctl)) {
  154                         err = -ENODEV;
  155                         mlx4_err(dev, "Couldn't restore HCA PCI Express Link control register, aborting\n");
  156                         goto out;
  157                 }
  158         }
  159 
  160         for (i = 0; i < 16; ++i) {
  161                 if (i * 4 == PCI_COMMAND)
  162                         continue;
  163 
  164                 if (pci_write_config_dword(dev->persist->pdev, i * 4,
  165                                            hca_header[i])) {
  166                         err = -ENODEV;
  167                         mlx4_err(dev, "Couldn't restore HCA reg %x, aborting\n",
  168                                  i);
  169                         goto out;
  170                 }
  171         }
  172 
  173         if (pci_write_config_dword(dev->persist->pdev, PCI_COMMAND,
  174                                    hca_header[PCI_COMMAND / 4])) {
  175                 err = -ENODEV;
  176                 mlx4_err(dev, "Couldn't restore HCA COMMAND, aborting\n");
  177                 goto out;
  178         }
  179 
  180 out:
  181         kfree(hca_header);
  182 
  183         return err;
  184 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/mlx4/mlx4_core/mlx4_reset.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx4/mlx4_core/mlx4_reset.c