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

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