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1/*2 * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.3 * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.4 *5 * This software is available to you under a choice of one of two6 * licenses. You may choose to be licensed under the terms of the GNU7 * General Public License (GPL) Version 2, available from the file8 * COPYING in the main directory of this source tree, or the9 * OpenIB.org BSD license below:10 *11 * Redistribution and use in source and binary forms, with or12 * without modification, are permitted provided that the following13 * conditions are met:14 *15 * - Redistributions of source code must retain the above16 * copyright notice, this list of conditions and the following17 * disclaimer.18 *19 * - Redistributions in binary form must reproduce the above20 * copyright notice, this list of conditions and the following21 * disclaimer in the documentation and/or other materials22 * 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 OF26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE31 * 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 42int 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 0xf000056#define MLX4_RESET_SIZE 0x40057#define MLX4_SEM_OFFSET 0x3fc58#define MLX4_RESET_OFFSET 0x1059#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 to66 * save off the PCI header before reset and then restore it67 * after the chip reboots. We skip config space offsets 2268 * 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 180out:181 kfree(hca_header);182 183 return err;184}185