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kernel add
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/*
* Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2007, 2008 Mellanox Technologies. 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/errno.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/jiffies.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
");
goto out;
}
pcie_cap = pci_pcie_cap(dev->persist->pdev);
for (i = 0; i < 64; ++i) {
if (i == 22 || i == 23)
continue;
if (pci_read_config_dword(dev->persist->pdev, i * 4,
hca_header + i)) {
err = -ENODEV;
mlx4_err(dev, "Couldn't save HCA PCI header, aborting
");
goto out;
}
}
reset = ioremap(pci_resource_start(dev->persist->pdev, 0) +
MLX4_RESET_BASE,
MLX4_RESET_SIZE);
if (!reset) {
err = -ENOMEM;
mlx4_err(dev, "Couldn't map HCA reset register, aborting
");
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
");
err = -EAGAIN;
iounmap(reset);
goto out;
}
/* actually hit reset */
writel(MLX4_RESET_VALUE, reset + MLX4_RESET_OFFSET);
iounmap(reset);
/* Docs say to wait one second before accessing device */
msleep(1000);
end = jiffies + MLX4_RESET_TIMEOUT_JIFFIES;
do {
if (!pci_read_config_word(dev->persist->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
");
goto out;
}
/* Now restore the PCI headers */
if (pcie_cap) {
devctl = hca_header[(pcie_cap + PCI_EXP_DEVCTL) / 4];
if (pcie_capability_write_word(dev->persist->pdev,
PCI_EXP_DEVCTL,
devctl)) {
err = -ENODEV;
mlx4_err(dev, "Couldn't restore HCA PCI Express Device Control register, aborting
");
goto out;
}
linkctl = hca_header[(pcie_cap + PCI_EXP_LNKCTL) / 4];
if (pcie_capability_write_word(dev->persist->pdev,
PCI_EXP_LNKCTL,
linkctl)) {
err = -ENODEV;
mlx4_err(dev, "Couldn't restore HCA PCI Express Link control register, aborting
");
goto out;
}
}
for (i = 0; i < 16; ++i) {
if (i * 4 == PCI_COMMAND)
continue;
if (pci_write_config_dword(dev->persist->pdev, i * 4,
hca_header[i])) {
err = -ENODEV;
mlx4_err(dev, "Couldn't restore HCA reg %x, aborting
",
i);
goto out;
}
}
if (pci_write_config_dword(dev->persist->pdev, PCI_COMMAND,
hca_header[PCI_COMMAND / 4])) {
err = -ENODEV;
mlx4_err(dev, "Couldn't restore HCA COMMAND, aborting
");
goto out;
}
out:
kfree(hca_header);
return err;
}
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