LXR linux/drivers/ssb/pcihost

   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
  22static 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
  43static 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
  61static 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
  67static 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
 101out:
 102        return err;
 103
 104err_pci_release_regions:
 105        pci_release_regions(dev);
 106err_pci_disable:
 107        pci_disable_device(dev);
 108err_kfree_ssb:
 109        kfree(ssb);
 110        return err;
 111}
 112
 113static 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
 124int 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}
 134EXPORT_SYMBOL(ssb_pcihost_register);
 135