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/pm.h>
  15 #include <linux/pci.h>
  16 #include <linux/export.h>
  17 #include <linux/slab.h>
  18 #include <linux/ssb/ssb.h>
  19
  20
  21 #ifdef CONFIG_PM_SLEEP
  22 static int ssb_pcihost_suspend(struct device *d)
  23 {
  24         struct pci_dev *dev = to_pci_dev(d);
  25         struct ssb_bus *ssb = pci_get_drvdata(dev);
  26         int err;
  27
  28         err = ssb_bus_suspend(ssb);
  29         if (err)
  30                 return err;
  31         pci_save_state(dev);
  32         pci_disable_device(dev);
  33
  34         /* if there is a wakeup enabled child device on ssb bus,
  35            enable pci wakeup posibility. */
  36         device_set_wakeup_enable(d, d->power.wakeup_path);
  37
  38         pci_prepare_to_sleep(dev);
  39
  40         return 0;
  41 }
  42
  43 static int ssb_pcihost_resume(struct device *d)
  44 {
  45         struct pci_dev *dev = to_pci_dev(d);
  46         struct ssb_bus *ssb = pci_get_drvdata(dev);
  47         int err;
  48
  49         pci_back_from_sleep(dev);
  50         err = pci_enable_device(dev);
  51         if (err)
  52                 return err;
  53         pci_restore_state(dev);
  54         err = ssb_bus_resume(ssb);
  55         if (err)
  56                 return err;
  57
  58         return 0;
  59 }
  60
  61 static const struct dev_pm_ops ssb_pcihost_pm_ops = {
  62         SET_SYSTEM_SLEEP_PM_OPS(ssb_pcihost_suspend, ssb_pcihost_resume)
  63 };
  64
  65 #endif /* CONFIG_PM_SLEEP */
  66
  67 static int ssb_pcihost_probe(struct pci_dev *dev,
  68                              const struct pci_device_id *id)
  69 {
  70         struct ssb_bus *ssb;
  71         int err = -ENOMEM;
  72         const char *name;
  73         u32 val;
  74
  75         ssb = kzalloc(sizeof(*ssb), GFP_KERNEL);
  76         if (!ssb)
  77                 goto out;
  78         err = pci_enable_device(dev);
  79         if (err)
  80                 goto err_kfree_ssb;
  81         name = dev_name(&dev->dev);
  82         if (dev->driver && dev->driver->name)
  83                 name = dev->driver->name;
  84         err = pci_request_regions(dev, name);
  85         if (err)
  86                 goto err_pci_disable;
  87         pci_set_master(dev);
  88
  89         /* Disable the RETRY_TIMEOUT register (0x41) to keep
  90          * PCI Tx retries from interfering with C3 CPU state */
  91         pci_read_config_dword(dev, 0x40, &val);
  92         if ((val & 0x0000ff00) != 0)
  93                 pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
  94
  95         err = ssb_bus_pcibus_register(ssb, dev);
  96         if (err)
  97                 goto err_pci_release_regions;
  98
  99         pci_set_drvdata(dev, ssb);
 100
 101 out:
 102         return err;
 103
 104 err_pci_release_regions:
 105         pci_release_regions(dev);
 106 err_pci_disable:
 107         pci_disable_device(dev);
 108 err_kfree_ssb:
 109         kfree(ssb);
 110         return err;
 111 }
 112
 113 static void ssb_pcihost_remove(struct pci_dev *dev)
 114 {
 115         struct ssb_bus *ssb = pci_get_drvdata(dev);
 116
 117         ssb_bus_unregister(ssb);
 118         pci_release_regions(dev);
 119         pci_disable_device(dev);
 120         kfree(ssb);
 121         pci_set_drvdata(dev, NULL);
 122 }
 123
 124 int ssb_pcihost_register(struct pci_driver *driver)
 125 {
 126         driver->probe = ssb_pcihost_probe;
 127         driver->remove = ssb_pcihost_remove;
 128 #ifdef CONFIG_PM_SLEEP
 129         driver->driver.pm = &ssb_pcihost_pm_ops;
 130 #endif
 131
 132         return pci_register_driver(driver);
 133 }
 134 EXPORT_SYMBOL(ssb_pcihost_register);