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184 lines
5.0 KiB
184 lines
5.0 KiB
/* |
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* Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved. |
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* Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved. |
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* |
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* This software is available to you under a choice of one of two |
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* licenses. You may choose to be licensed under the terms of the GNU |
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* General Public License (GPL) Version 2, available from the file |
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* COPYING in the main directory of this source tree, or the |
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* OpenIB.org BSD license below: |
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* |
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* Redistribution and use in source and binary forms, with or |
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* without modification, are permitted provided that the following |
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* conditions are met: |
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* |
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* - Redistributions of source code must retain the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer. |
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* |
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* - Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following |
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* disclaimer in the documentation and/or other materials |
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* provided with the distribution. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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* SOFTWARE. |
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*/ |
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#include <linux/errno.h> |
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#include <linux/pci.h> |
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#include <linux/delay.h> |
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#include <linux/slab.h> |
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#include <linux/jiffies.h> |
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#include "mlx4.h" |
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int mlx4_reset(struct mlx4_dev *dev) |
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{ |
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void __iomem *reset; |
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u32 *hca_header = NULL; |
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int pcie_cap; |
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u16 devctl; |
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u16 linkctl; |
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u16 vendor; |
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unsigned long end; |
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u32 sem; |
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int i; |
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int err = 0; |
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#define MLX4_RESET_BASE 0xf0000 |
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#define MLX4_RESET_SIZE 0x400 |
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#define MLX4_SEM_OFFSET 0x3fc |
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#define MLX4_RESET_OFFSET 0x10 |
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#define MLX4_RESET_VALUE swab32(1) |
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#define MLX4_SEM_TIMEOUT_JIFFIES (10 * HZ) |
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#define MLX4_RESET_TIMEOUT_JIFFIES (2 * HZ) |
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/* |
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* Reset the chip. This is somewhat ugly because we have to |
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* save off the PCI header before reset and then restore it |
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* after the chip reboots. We skip config space offsets 22 |
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* and 23 since those have a special meaning. |
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*/ |
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/* Do we need to save off the full 4K PCI Express header?? */ |
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hca_header = kmalloc(256, GFP_KERNEL); |
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if (!hca_header) { |
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err = -ENOMEM; |
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mlx4_err(dev, "Couldn't allocate memory to save HCA PCI header, aborting\n"); |
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goto out; |
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} |
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pcie_cap = pci_pcie_cap(dev->persist->pdev); |
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for (i = 0; i < 64; ++i) { |
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if (i == 22 || i == 23) |
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continue; |
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if (pci_read_config_dword(dev->persist->pdev, i * 4, |
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hca_header + i)) { |
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err = -ENODEV; |
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mlx4_err(dev, "Couldn't save HCA PCI header, aborting\n"); |
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goto out; |
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} |
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} |
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reset = ioremap(pci_resource_start(dev->persist->pdev, 0) + |
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MLX4_RESET_BASE, |
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MLX4_RESET_SIZE); |
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if (!reset) { |
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err = -ENOMEM; |
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mlx4_err(dev, "Couldn't map HCA reset register, aborting\n"); |
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goto out; |
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} |
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/* grab HW semaphore to lock out flash updates */ |
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end = jiffies + MLX4_SEM_TIMEOUT_JIFFIES; |
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do { |
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sem = readl(reset + MLX4_SEM_OFFSET); |
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if (!sem) |
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break; |
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msleep(1); |
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} while (time_before(jiffies, end)); |
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if (sem) { |
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mlx4_err(dev, "Failed to obtain HW semaphore, aborting\n"); |
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err = -EAGAIN; |
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iounmap(reset); |
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goto out; |
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} |
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/* actually hit reset */ |
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writel(MLX4_RESET_VALUE, reset + MLX4_RESET_OFFSET); |
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iounmap(reset); |
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/* Docs say to wait one second before accessing device */ |
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msleep(1000); |
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end = jiffies + MLX4_RESET_TIMEOUT_JIFFIES; |
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do { |
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if (!pci_read_config_word(dev->persist->pdev, PCI_VENDOR_ID, |
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&vendor) && vendor != 0xffff) |
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break; |
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msleep(1); |
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} while (time_before(jiffies, end)); |
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if (vendor == 0xffff) { |
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err = -ENODEV; |
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mlx4_err(dev, "PCI device did not come back after reset, aborting\n"); |
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goto out; |
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} |
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/* Now restore the PCI headers */ |
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if (pcie_cap) { |
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devctl = hca_header[(pcie_cap + PCI_EXP_DEVCTL) / 4]; |
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if (pcie_capability_write_word(dev->persist->pdev, |
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PCI_EXP_DEVCTL, |
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devctl)) { |
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err = -ENODEV; |
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mlx4_err(dev, "Couldn't restore HCA PCI Express Device Control register, aborting\n"); |
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goto out; |
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} |
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linkctl = hca_header[(pcie_cap + PCI_EXP_LNKCTL) / 4]; |
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if (pcie_capability_write_word(dev->persist->pdev, |
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PCI_EXP_LNKCTL, |
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linkctl)) { |
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err = -ENODEV; |
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mlx4_err(dev, "Couldn't restore HCA PCI Express Link control register, aborting\n"); |
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goto out; |
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} |
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} |
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for (i = 0; i < 16; ++i) { |
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if (i * 4 == PCI_COMMAND) |
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continue; |
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if (pci_write_config_dword(dev->persist->pdev, i * 4, |
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hca_header[i])) { |
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err = -ENODEV; |
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mlx4_err(dev, "Couldn't restore HCA reg %x, aborting\n", |
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i); |
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goto out; |
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} |
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} |
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if (pci_write_config_dword(dev->persist->pdev, PCI_COMMAND, |
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hca_header[PCI_COMMAND / 4])) { |
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err = -ENODEV; |
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mlx4_err(dev, "Couldn't restore HCA COMMAND, aborting\n"); |
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goto out; |
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} |
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out: |
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kfree(hca_header); |
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return err; |
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}
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