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(pdev: dev);
26 int err;
27
28 err = ssb_bus_suspend(bus: 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(dev: d, enable: 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(pdev: 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(bus: 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 u32 val;
73
74 ssb = kzalloc(size: sizeof(*ssb), GFP_KERNEL);
75 if (!ssb)
76 goto out;
77 err = pci_enable_device(dev);
78 if (err)
79 goto err_kfree_ssb;
80 err = pci_request_regions(dev, dev_driver_string(dev: &dev->dev));
81 if (err)
82 goto err_pci_disable;
83 pci_set_master(dev);
84
85 /* Disable the RETRY_TIMEOUT register (0x41) to keep
86 * PCI Tx retries from interfering with C3 CPU state */
87 pci_read_config_dword(dev, where: 0x40, val: &val);
88 if ((val & 0x0000ff00) != 0)
89 pci_write_config_dword(dev, where: 0x40, val: val & 0xffff00ff);
90
91 err = ssb_bus_pcibus_register(bus: ssb, host_pci: dev);
92 if (err)
93 goto err_pci_release_regions;
94
95 pci_set_drvdata(pdev: dev, data: ssb);
96
97out:
98 return err;
99
100err_pci_release_regions:
101 pci_release_regions(dev);
102err_pci_disable:
103 pci_disable_device(dev);
104err_kfree_ssb:
105 kfree(objp: ssb);
106 return err;
107}
108
109static void ssb_pcihost_remove(struct pci_dev *dev)
110{
111 struct ssb_bus *ssb = pci_get_drvdata(pdev: dev);
112
113 ssb_bus_unregister(bus: ssb);
114 pci_release_regions(dev);
115 pci_disable_device(dev);
116 kfree(objp: ssb);
117 pci_set_drvdata(pdev: dev, NULL);
118}
119
120int ssb_pcihost_register(struct pci_driver *driver)
121{
122 driver->probe = ssb_pcihost_probe;
123 driver->remove = ssb_pcihost_remove;
124#ifdef CONFIG_PM_SLEEP
125 driver->driver.pm = &ssb_pcihost_pm_ops;
126#endif
127
128 return pci_register_driver(driver);
129}
130EXPORT_SYMBOL(ssb_pcihost_register);
131

source code of linux/drivers/ssb/pcihost_wrapper.c