Roland Dreier | 225c7b1 | 2007-05-08 18:00:38 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved. |
Jack Morgenstein | 51a379d | 2008-07-25 10:32:52 -0700 | [diff] [blame] | 3 | * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved. |
Roland Dreier | 225c7b1 | 2007-05-08 18:00:38 -0700 | [diff] [blame] | 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 | |
Roland Dreier | 225c7b1 | 2007-05-08 18:00:38 -0700 | [diff] [blame] | 34 | #include <linux/errno.h> |
| 35 | #include <linux/pci.h> |
| 36 | #include <linux/delay.h> |
| 37 | #include <linux/slab.h> |
Al Viro | 9cbe05c | 2007-05-15 20:36:30 +0100 | [diff] [blame] | 38 | #include <linux/jiffies.h> |
Roland Dreier | 225c7b1 | 2007-05-08 18:00:38 -0700 | [diff] [blame] | 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 " |
| 76 | "PCI header, aborting.\n"); |
| 77 | goto out; |
| 78 | } |
| 79 | |
| 80 | pcie_cap = pci_find_capability(dev->pdev, PCI_CAP_ID_EXP); |
| 81 | |
| 82 | for (i = 0; i < 64; ++i) { |
| 83 | if (i == 22 || i == 23) |
| 84 | continue; |
| 85 | if (pci_read_config_dword(dev->pdev, i * 4, hca_header + i)) { |
| 86 | err = -ENODEV; |
| 87 | mlx4_err(dev, "Couldn't save HCA " |
| 88 | "PCI header, aborting.\n"); |
| 89 | goto out; |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | reset = ioremap(pci_resource_start(dev->pdev, 0) + 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 | |
Eli Cohen | 947b2a8 | 2007-08-13 17:57:03 +0300 | [diff] [blame] | 122 | /* Docs say to wait one second before accessing device */ |
| 123 | msleep(1000); |
| 124 | |
Roland Dreier | 225c7b1 | 2007-05-08 18:00:38 -0700 | [diff] [blame] | 125 | end = jiffies + MLX4_RESET_TIMEOUT_JIFFIES; |
| 126 | do { |
| 127 | if (!pci_read_config_word(dev->pdev, PCI_VENDOR_ID, &vendor) && |
| 128 | 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, " |
| 137 | "aborting.\n"); |
| 138 | goto out; |
| 139 | } |
| 140 | |
| 141 | /* Now restore the PCI headers */ |
| 142 | if (pcie_cap) { |
| 143 | devctl = hca_header[(pcie_cap + PCI_EXP_DEVCTL) / 4]; |
| 144 | if (pci_write_config_word(dev->pdev, pcie_cap + PCI_EXP_DEVCTL, |
| 145 | devctl)) { |
| 146 | err = -ENODEV; |
| 147 | mlx4_err(dev, "Couldn't restore HCA PCI Express " |
| 148 | "Device Control register, aborting.\n"); |
| 149 | goto out; |
| 150 | } |
| 151 | linkctl = hca_header[(pcie_cap + PCI_EXP_LNKCTL) / 4]; |
| 152 | if (pci_write_config_word(dev->pdev, pcie_cap + PCI_EXP_LNKCTL, |
| 153 | linkctl)) { |
| 154 | err = -ENODEV; |
| 155 | mlx4_err(dev, "Couldn't restore HCA PCI Express " |
| 156 | "Link control register, aborting.\n"); |
| 157 | goto out; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | for (i = 0; i < 16; ++i) { |
| 162 | if (i * 4 == PCI_COMMAND) |
| 163 | continue; |
| 164 | |
| 165 | if (pci_write_config_dword(dev->pdev, i * 4, hca_header[i])) { |
| 166 | err = -ENODEV; |
| 167 | mlx4_err(dev, "Couldn't restore HCA reg %x, " |
| 168 | "aborting.\n", i); |
| 169 | goto out; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | if (pci_write_config_dword(dev->pdev, PCI_COMMAND, |
| 174 | hca_header[PCI_COMMAND / 4])) { |
| 175 | err = -ENODEV; |
| 176 | mlx4_err(dev, "Couldn't restore HCA COMMAND, " |
| 177 | "aborting.\n"); |
| 178 | goto out; |
| 179 | } |
| 180 | |
| 181 | out: |
| 182 | kfree(hca_header); |
| 183 | |
| 184 | return err; |
| 185 | } |