--- /dev/null
+/*
+ * 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\n");
+ 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\n");
+ 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\n");
+ 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\n");
+ 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\n");
+ 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\n");
+ 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\n");
+ 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\n",
+ 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\n");
+ goto out;
+ }
+
+out:
+ kfree(hca_header);
+
+ return err;
+}
Code Review / kvmfornfv.git / blobdiff