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