Linux 6.9-rc1
[linux-2.6-microblaze.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 <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(dev);
26         int err;
27
28         err = ssb_bus_suspend(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(d, 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(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(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(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));
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, 0x40, &val);
88         if ((val & 0x0000ff00) != 0)
89                 pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
90
91         err = ssb_bus_pcibus_register(ssb, dev);
92         if (err)
93                 goto err_pci_release_regions;
94
95         pci_set_drvdata(dev, 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(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(dev);
112
113         ssb_bus_unregister(ssb);
114         pci_release_regions(dev);
115         pci_disable_device(dev);
116         kfree(ssb);
117         pci_set_drvdata(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);