Getting a PCI memory region


ioremap

  drivers/hotplug/cpqphp.c

   ctrl->hpc_reg = ioremap(pci_resource_start(pdev, 0),
                              pci_resource_len(pdev, 0));
   if (!ctrl->hpc_reg) {
     err("cannot remap MMIO region %lx @ %lx\n",
          pci_resource_len(pdev, 0),
          pci_resource_start(pdev, 0));
     rc = -ENODEV;
     goto err_free_mem_region;
   }