drivers/ssb/pcihost_wrapper.c

   1 /*
   2  * Sonics Silicon Backplane
   3  * PCI Hostdevice wrapper
   4  *
   5  * Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>
   6  * Copyright (c) 2005 Stefano Brivio <st3@riseup.net>
   7  * Copyright (c) 2005 Danny van Dyk <kugelfang@gentoo.org>
   8  * Copyright (c) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
   9  * Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>
  10  *
  11  * Licensed under the GNU/GPL. See COPYING for details.
  12  */
  13
  14 #include <linux/pci.h>
  15 #include <linux/export.h>
  16 #include <linux/slab.h>
  17 #include <linux/ssb/ssb.h>
  18
  19
  20 #ifdef CONFIG_PM
  21 static int ssb_pcihost_suspend(struct pci_dev *dev, pm_message_t state)
  22 {
  23         struct ssb_bus *ssb = pci_get_drvdata(dev);
  24         int err;
  25
  26         err = ssb_bus_suspend(ssb);
  27         if (err)
  28                 return err;
  29         pci_save_state(dev);
  30         pci_disable_device(dev);
  31         pci_set_power_state(dev, pci_choose_state(dev, state));
  32
  33         return 0;
  34 }
  35
  36 static int ssb_pcihost_resume(struct pci_dev *dev)
  37 {
  38         struct ssb_bus *ssb = pci_get_drvdata(dev);
  39         int err;
  40
  41         pci_set_power_state(dev, PCI_D0);
  42         err = pci_enable_device(dev);
  43         if (err)
  44                 return err;
  45         pci_restore_state(dev);
  46         err = ssb_bus_resume(ssb);
  47         if (err)
  48                 return err;
  49
  50         return 0;
  51 }
  52 #else /* CONFIG_PM */
  53 # define ssb_pcihost_suspend    NULL
  54 # define ssb_pcihost_resume     NULL
  55 #endif /* CONFIG_PM */
  56
  57 static int ssb_pcihost_probe(struct pci_dev *dev,
  58                              const struct pci_device_id *id)
  59 {
  60         struct ssb_bus *ssb;
  61         int err = -ENOMEM;
  62         const char *name;
  63         u32 val;
  64
  65         ssb = kzalloc(sizeof(*ssb), GFP_KERNEL);
  66         if (!ssb)
  67                 goto out;
  68         err = pci_enable_device(dev);
  69         if (err)
  70                 goto err_kfree_ssb;
  71         name = dev_name(&dev->dev);
  72         if (dev->driver && dev->driver->name)
  73                 name = dev->driver->name;
  74         err = pci_request_regions(dev, name);
  75         if (err)
  76                 goto err_pci_disable;
  77         pci_set_master(dev);
  78
  79         /* Disable the RETRY_TIMEOUT register (0x41) to keep
  80          * PCI Tx retries from interfering with C3 CPU state */
  81         pci_read_config_dword(dev, 0x40, &val);
  82         if ((val & 0x0000ff00) != 0)
  83                 pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
  84
  85         err = ssb_bus_pcibus_register(ssb, dev);
  86         if (err)
  87                 goto err_pci_release_regions;
  88
  89         pci_set_drvdata(dev, ssb);
  90
  91 out:
  92         return err;
  93
  94 err_pci_release_regions:
  95         pci_release_regions(dev);
  96 err_pci_disable:
  97         pci_disable_device(dev);
  98 err_kfree_ssb:
  99         kfree(ssb);
 100         return err;
 101 }
 102
 103 static void ssb_pcihost_remove(struct pci_dev *dev)
 104 {
 105         struct ssb_bus *ssb = pci_get_drvdata(dev);
 106
 107         ssb_bus_unregister(ssb);
 108         pci_release_regions(dev);
 109         pci_disable_device(dev);
 110         kfree(ssb);
 111         pci_set_drvdata(dev, NULL);
 112 }
 113
 114 int ssb_pcihost_register(struct pci_driver *driver)
 115 {
 116         driver->probe = ssb_pcihost_probe;
 117         driver->remove = ssb_pcihost_remove;
 118         driver->suspend = ssb_pcihost_suspend;
 119         driver->resume = ssb_pcihost_resume;
 120
 121         return pci_register_driver(driver);
 122 }
 123 EXPORT_SYMBOL(ssb_pcihost_register);