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
ssb_pcihost_suspend(struct pci_dev * dev,pm_message_t state)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
ssb_pcihost_resume(struct pci_dev * dev)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
ssb_pcihost_probe(struct pci_dev * dev,const struct pci_device_id * id)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
ssb_pcihost_remove(struct pci_dev * dev)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
ssb_pcihost_register(struct pci_driver * driver)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);
123