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
ssb_pcihost_suspend(struct device * d)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 
ssb_pcihost_resume(struct device * d)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 
ssb_pcihost_probe(struct pci_dev * dev,const struct pci_device_id * id)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 
ssb_pcihost_remove(struct pci_dev * dev)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 
ssb_pcihost_register(struct pci_driver * driver)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