drivers/pci/pcie/portdrv_pci.c

   1 /*
   2  * File:        portdrv_pci.c
   3  * Purpose:     PCI Express Port Bus Driver
   4  *
   5  * Copyright (C) 2004 Intel
   6  * Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/pci.h>
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/pm.h>
  14 #include <linux/init.h>
  15 #include <linux/slab.h>
  16 #include <linux/pcieport_if.h>
  17
  18 #include "portdrv.h"
  19
  20 /*
  21  * Version Information
  22  */
  23 #define DRIVER_VERSION "v1.0"
  24 #define DRIVER_AUTHOR "tom.l.nguyen@intel.com"
  25 #define DRIVER_DESC "PCIE Port Bus Driver"
  26 MODULE_AUTHOR(DRIVER_AUTHOR);
  27 MODULE_DESCRIPTION(DRIVER_DESC);
  28 MODULE_LICENSE("GPL");
  29
  30 /* global data */
  31 static const char device_name[] = "pcieport-driver";
  32
  33 static void pci_save_msi_state(struct pci_dev *dev)
  34 {
  35         struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
  36         int i = 0, pos;
  37         u16 control;
  38
  39         if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
  40                 return;
  41
  42         pci_read_config_dword(dev, pos, &p_ext->saved_msi_config_space[i++]);
  43         control = p_ext->saved_msi_config_space[0] >> 16;
  44         pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
  45                 &p_ext->saved_msi_config_space[i++]);
  46         if (control & PCI_MSI_FLAGS_64BIT) {
  47                 pci_read_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
  48                         &p_ext->saved_msi_config_space[i++]);
  49                 pci_read_config_dword(dev, pos + PCI_MSI_DATA_64,
  50                         &p_ext->saved_msi_config_space[i++]);
  51         } else
  52                 pci_read_config_dword(dev, pos + PCI_MSI_DATA_32,
  53                         &p_ext->saved_msi_config_space[i++]);
  54         if (control & PCI_MSI_FLAGS_MASKBIT)
  55                 pci_read_config_dword(dev, pos + PCI_MSI_MASK_BIT,
  56                         &p_ext->saved_msi_config_space[i++]);
  57 }
  58
  59 static void pci_restore_msi_state(struct pci_dev *dev)
  60 {
  61         struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
  62         int i = 0, pos;
  63         u16 control;
  64
  65         if ((pos = pci_find_capability(dev, PCI_CAP_ID_MSI)) <= 0)
  66                 return;
  67
  68         control = p_ext->saved_msi_config_space[i++] >> 16;
  69         pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
  70         pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
  71                 p_ext->saved_msi_config_space[i++]);
  72         if (control & PCI_MSI_FLAGS_64BIT) {
  73                 pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
  74                         p_ext->saved_msi_config_space[i++]);
  75                 pci_write_config_dword(dev, pos + PCI_MSI_DATA_64,
  76                         p_ext->saved_msi_config_space[i++]);
  77         } else
  78                 pci_write_config_dword(dev, pos + PCI_MSI_DATA_32,
  79                         p_ext->saved_msi_config_space[i++]);
  80         if (control & PCI_MSI_FLAGS_MASKBIT)
  81                 pci_write_config_dword(dev, pos + PCI_MSI_MASK_BIT,
  82                         p_ext->saved_msi_config_space[i++]);
  83 }
  84
  85 static void pcie_portdrv_save_config(struct pci_dev *dev)
  86 {
  87         struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
  88
  89         pci_save_state(dev);
  90         if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
  91                 pci_save_msi_state(dev);
  92 }
  93
  94 static int pcie_portdrv_restore_config(struct pci_dev *dev)
  95 {
  96         struct pcie_port_device_ext *p_ext = pci_get_drvdata(dev);
  97         int retval;
  98
  99         pci_restore_state(dev);
 100         if (p_ext->interrupt_mode == PCIE_PORT_MSI_MODE)
 101                 pci_restore_msi_state(dev);
 102         retval = pci_enable_device(dev);
 103         if (retval)
 104                 return retval;
 105         pci_set_master(dev);
 106         return 0;
 107 }
 108
 109 /*
 110  * pcie_portdrv_probe - Probe PCI-Express port devices
 111  * @dev: PCI-Express port device being probed
 112  *
 113  * If detected invokes the pcie_port_device_register() method for
 114  * this port device.
 115  *
 116  */
 117 static int __devinit pcie_portdrv_probe (struct pci_dev *dev,
 118                                 const struct pci_device_id *id )
 119 {
 120         int                     status;
 121
 122         status = pcie_port_device_probe(dev);
 123         if (status)
 124                 return status;
 125
 126         if (pci_enable_device(dev) < 0)
 127                 return -ENODEV;
 128
 129         pci_set_master(dev);
 130         if (!dev->irq) {
 131                 printk(KERN_WARNING
 132                 "%s->Dev[%04x:%04x] has invalid IRQ. Check vendor BIOS\n",
 133                 __FUNCTION__, dev->device, dev->vendor);
 134         }
 135         if (pcie_port_device_register(dev))
 136                 return -ENOMEM;
 137
 138         return 0;
 139 }
 140
 141 static void pcie_portdrv_remove (struct pci_dev *dev)
 142 {
 143         pcie_port_device_remove(dev);
 144         kfree(pci_get_drvdata(dev));
 145 }
 146
 147 #ifdef CONFIG_PM
 148 static int pcie_portdrv_suspend (struct pci_dev *dev, pm_message_t state)
 149 {
 150         int ret = pcie_port_device_suspend(dev, state);
 151
 152         pcie_portdrv_save_config(dev);
 153         return ret;
 154 }
 155
 156 static int pcie_portdrv_resume (struct pci_dev *dev)
 157 {
 158         pcie_portdrv_restore_config(dev);
 159         return pcie_port_device_resume(dev);
 160 }
 161 #endif
 162
 163 /*
 164  * LINUX Device Driver Model
 165  */
 166 static const struct pci_device_id port_pci_ids[] = { {
 167         /* handle any PCI-Express port */
 168         PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0),
 169         }, { /* end: all zeroes */ }
 170 };
 171 MODULE_DEVICE_TABLE(pci, port_pci_ids);
 172
 173 static struct pci_driver pcie_portdrv = {
 174         .name           = (char *)device_name,
 175         .id_table       = &port_pci_ids[0],
 176
 177         .probe          = pcie_portdrv_probe,
 178         .remove         = pcie_portdrv_remove,
 179
 180 #ifdef  CONFIG_PM
 181         .suspend        = pcie_portdrv_suspend,
 182         .resume         = pcie_portdrv_resume,
 183 #endif  /* PM */
 184 };
 185
 186 static int __init pcie_portdrv_init(void)
 187 {
 188         int retval = 0;
 189
 190         pcie_port_bus_register();
 191         retval = pci_register_driver(&pcie_portdrv);
 192         if (retval)
 193                 pcie_port_bus_unregister();
 194         return retval;
 195 }
 196
 197 static void __exit pcie_portdrv_exit(void)
 198 {
 199         pci_unregister_driver(&pcie_portdrv);
 200         pcie_port_bus_unregister();
 201 }
 202
 203 module_init(pcie_portdrv_init);
 204 module_exit(pcie_portdrv_exit);