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