ssb: pci: trivial: correct amount of maximum retries
[linux-2.6.git] / 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 <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
20 static 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
35 static 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
56 static 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
90 out:
91         return err;
92
93 err_pci_release_regions:
94         pci_release_regions(dev);
95 err_pci_disable:
96         pci_disable_device(dev);
97 err_kfree_ssb:
98         kfree(ssb);
99         return err;
100 }
101
102 static 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
113 int 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 }
122 EXPORT_SYMBOL(ssb_pcihost_register);