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 |
22 | static 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 | |
43 | static 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 | |
61 | static 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 | |
67 | static 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 | |
97 | out: |
98 | return err; |
99 | |
100 | err_pci_release_regions: |
101 | pci_release_regions(dev); |
102 | err_pci_disable: |
103 | pci_disable_device(dev); |
104 | err_kfree_ssb: |
105 | kfree(objp: ssb); |
106 | return err; |
107 | } |
108 | |
109 | static 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 | |
120 | int 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 | } |
130 | EXPORT_SYMBOL(ssb_pcihost_register); |
131 | |