pcihost_wrapper.c
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/*
* Sonics Silicon Backplane
* PCI Hostdevice wrapper
*
* Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>
* Copyright (c) 2005 Stefano Brivio <st3@riseup.net>
* Copyright (c) 2005 Danny van Dyk <kugelfang@gentoo.org>
* Copyright (c) 2005 Andreas Jaggi <andreas.jaggi@waterwave.ch>
* Copyright (c) 2005-2007 Michael Buesch <m@bues.ch>
*
* Licensed under the GNU/GPL. See COPYING for details.
*/
#include <linux/pci.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/ssb/ssb.h>
#ifdef CONFIG_PM
static int ssb_pcihost_suspend(struct pci_dev *dev, pm_message_t state)
{
struct ssb_bus *ssb = pci_get_drvdata(dev);
int err;
err = ssb_bus_suspend(ssb);
if (err)
return err;
pci_save_state(dev);
pci_disable_device(dev);
pci_set_power_state(dev, pci_choose_state(dev, state));
return 0;
}
static int ssb_pcihost_resume(struct pci_dev *dev)
{
struct ssb_bus *ssb = pci_get_drvdata(dev);
int err;
pci_set_power_state(dev, PCI_D0);
err = pci_enable_device(dev);
if (err)
return err;
pci_restore_state(dev);
err = ssb_bus_resume(ssb);
if (err)
return err;
return 0;
}
#else /* CONFIG_PM */
# define ssb_pcihost_suspend NULL
# define ssb_pcihost_resume NULL
#endif /* CONFIG_PM */
static int ssb_pcihost_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
struct ssb_bus *ssb;
int err = -ENOMEM;
const char *name;
u32 val;
ssb = kzalloc(sizeof(*ssb), GFP_KERNEL);
if (!ssb)
goto out;
err = pci_enable_device(dev);
if (err)
goto err_kfree_ssb;
name = dev_name(&dev->dev);
if (dev->driver && dev->driver->name)
name = dev->driver->name;
err = pci_request_regions(dev, name);
if (err)
goto err_pci_disable;
pci_set_master(dev);
/* Disable the RETRY_TIMEOUT register (0x41) to keep
* PCI Tx retries from interfering with C3 CPU state */
pci_read_config_dword(dev, 0x40, &val);
if ((val & 0x0000ff00) != 0)
pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
err = ssb_bus_pcibus_register(ssb, dev);
if (err)
goto err_pci_release_regions;
pci_set_drvdata(dev, ssb);
out:
return err;
err_pci_release_regions:
pci_release_regions(dev);
err_pci_disable:
pci_disable_device(dev);
err_kfree_ssb:
kfree(ssb);
return err;
}
static void ssb_pcihost_remove(struct pci_dev *dev)
{
struct ssb_bus *ssb = pci_get_drvdata(dev);
ssb_bus_unregister(ssb);
pci_release_regions(dev);
pci_disable_device(dev);
kfree(ssb);
pci_set_drvdata(dev, NULL);
}
int ssb_pcihost_register(struct pci_driver *driver)
{
driver->probe = ssb_pcihost_probe;
driver->remove = ssb_pcihost_remove;
driver->suspend = ssb_pcihost_suspend;
driver->resume = ssb_pcihost_resume;
return pci_register_driver(driver);
}
EXPORT_SYMBOL(ssb_pcihost_register);