pcihost_wrapper.c

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/*
 * Sonics Silicon Backplane
 * PCI Hostdevice wrapper
 *
 * Copyright (c) 2005 Martin Langer <[email protected]>
 * Copyright (c) 2005 Stefano Brivio <[email protected]>
 * Copyright (c) 2005 Danny van Dyk <[email protected]>
 * Copyright (c) 2005 Andreas Jaggi <[email protected]>
 * Copyright (c) 2005-2007 Michael Buesch <[email protected]>
 *
 * 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, 0);
    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 __devinit 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 __devinit 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);