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1da177e4 LT |
1 | /* |
2 | * arch/sh/kernel/cpu/bus.c | |
3 | * | |
4 | * Virtual bus for SuperH. | |
5 | * | |
6 | * Copyright (C) 2004 Paul Mundt | |
7 | * | |
8 | * Shamelessly cloned from arch/arm/mach-omap/bus.c, which was written | |
9 | * by: | |
10 | * | |
11 | * Copyright (C) 2003 - 2004 Nokia Corporation | |
12 | * Written by Tony Lindgren <tony@atomide.com> | |
13 | * Portions of code based on sa1111.c. | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify it | |
16 | * under the terms of the GNU General Public License as published by the | |
17 | * Free Software Foundation; either version 2 of the License, or (at your | |
18 | * option) any later version. | |
19 | */ | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/module.h> | |
24 | #include <asm/bus-sh.h> | |
25 | ||
26 | static int sh_bus_match(struct device *dev, struct device_driver *drv) | |
27 | { | |
28 | struct sh_driver *shdrv = to_sh_driver(drv); | |
29 | struct sh_dev *shdev = to_sh_dev(dev); | |
30 | ||
31 | return shdev->dev_id == shdrv->dev_id; | |
32 | } | |
33 | ||
34 | static int sh_bus_suspend(struct device *dev, u32 state) | |
35 | { | |
36 | struct sh_dev *shdev = to_sh_dev(dev); | |
37 | struct sh_driver *shdrv = to_sh_driver(dev->driver); | |
38 | ||
39 | if (shdrv && shdrv->suspend) | |
40 | return shdrv->suspend(shdev, state); | |
41 | ||
42 | return 0; | |
43 | } | |
44 | ||
45 | static int sh_bus_resume(struct device *dev) | |
46 | { | |
47 | struct sh_dev *shdev = to_sh_dev(dev); | |
48 | struct sh_driver *shdrv = to_sh_driver(dev->driver); | |
49 | ||
50 | if (shdrv && shdrv->resume) | |
51 | return shdrv->resume(shdev); | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
56 | static struct device sh_bus_devices[SH_NR_BUSES] = { | |
57 | { | |
58 | .bus_id = SH_BUS_NAME_VIRT, | |
59 | }, | |
60 | }; | |
61 | ||
62 | struct bus_type sh_bus_types[SH_NR_BUSES] = { | |
63 | { | |
64 | .name = SH_BUS_NAME_VIRT, | |
65 | .match = sh_bus_match, | |
66 | .suspend = sh_bus_suspend, | |
67 | .resume = sh_bus_resume, | |
68 | }, | |
69 | }; | |
70 | ||
71 | static int sh_device_probe(struct device *dev) | |
72 | { | |
73 | struct sh_dev *shdev = to_sh_dev(dev); | |
74 | struct sh_driver *shdrv = to_sh_driver(dev->driver); | |
75 | ||
76 | if (shdrv && shdrv->probe) | |
77 | return shdrv->probe(shdev); | |
78 | ||
79 | return -ENODEV; | |
80 | } | |
81 | ||
82 | static int sh_device_remove(struct device *dev) | |
83 | { | |
84 | struct sh_dev *shdev = to_sh_dev(dev); | |
85 | struct sh_driver *shdrv = to_sh_driver(dev->driver); | |
86 | ||
87 | if (shdrv && shdrv->remove) | |
88 | return shdrv->remove(shdev); | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | int sh_device_register(struct sh_dev *dev) | |
94 | { | |
95 | if (!dev) | |
96 | return -EINVAL; | |
97 | ||
98 | if (dev->bus_id < 0 || dev->bus_id >= SH_NR_BUSES) { | |
99 | printk(KERN_ERR "%s: bus_id invalid: %s bus: %d\n", | |
100 | __FUNCTION__, dev->name, dev->bus_id); | |
101 | return -EINVAL; | |
102 | } | |
103 | ||
104 | dev->dev.parent = &sh_bus_devices[dev->bus_id]; | |
105 | dev->dev.bus = &sh_bus_types[dev->bus_id]; | |
106 | ||
107 | /* This is needed for USB OHCI to work */ | |
108 | if (dev->dma_mask) | |
109 | dev->dev.dma_mask = dev->dma_mask; | |
110 | ||
111 | snprintf(dev->dev.bus_id, BUS_ID_SIZE, "%s%u", | |
112 | dev->name, dev->dev_id); | |
113 | ||
114 | printk(KERN_INFO "Registering SH device '%s'. Parent at %s\n", | |
115 | dev->dev.bus_id, dev->dev.parent->bus_id); | |
116 | ||
117 | return device_register(&dev->dev); | |
118 | } | |
119 | ||
120 | void sh_device_unregister(struct sh_dev *dev) | |
121 | { | |
122 | device_unregister(&dev->dev); | |
123 | } | |
124 | ||
125 | int sh_driver_register(struct sh_driver *drv) | |
126 | { | |
127 | if (!drv) | |
128 | return -EINVAL; | |
129 | ||
130 | if (drv->bus_id < 0 || drv->bus_id >= SH_NR_BUSES) { | |
131 | printk(KERN_ERR "%s: bus_id invalid: bus: %d device %d\n", | |
132 | __FUNCTION__, drv->bus_id, drv->dev_id); | |
133 | return -EINVAL; | |
134 | } | |
135 | ||
136 | drv->drv.probe = sh_device_probe; | |
137 | drv->drv.remove = sh_device_remove; | |
138 | drv->drv.bus = &sh_bus_types[drv->bus_id]; | |
139 | ||
140 | return driver_register(&drv->drv); | |
141 | } | |
142 | ||
143 | void sh_driver_unregister(struct sh_driver *drv) | |
144 | { | |
145 | driver_unregister(&drv->drv); | |
146 | } | |
147 | ||
148 | static int __init sh_bus_init(void) | |
149 | { | |
150 | int i, ret = 0; | |
151 | ||
152 | for (i = 0; i < SH_NR_BUSES; i++) { | |
153 | ret = device_register(&sh_bus_devices[i]); | |
154 | if (ret != 0) { | |
155 | printk(KERN_ERR "Unable to register bus device %s\n", | |
156 | sh_bus_devices[i].bus_id); | |
157 | continue; | |
158 | } | |
159 | ||
160 | ret = bus_register(&sh_bus_types[i]); | |
161 | if (ret != 0) { | |
162 | printk(KERN_ERR "Unable to register bus %s\n", | |
163 | sh_bus_types[i].name); | |
164 | device_unregister(&sh_bus_devices[i]); | |
165 | } | |
166 | } | |
167 | ||
168 | printk(KERN_INFO "SH Virtual Bus initialized\n"); | |
169 | ||
170 | return ret; | |
171 | } | |
172 | ||
173 | static void __exit sh_bus_exit(void) | |
174 | { | |
175 | int i; | |
176 | ||
177 | for (i = 0; i < SH_NR_BUSES; i++) { | |
178 | bus_unregister(&sh_bus_types[i]); | |
179 | device_unregister(&sh_bus_devices[i]); | |
180 | } | |
181 | } | |
182 | ||
183 | module_init(sh_bus_init); | |
184 | module_exit(sh_bus_exit); | |
185 | ||
186 | MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>"); | |
187 | MODULE_DESCRIPTION("SH Virtual Bus"); | |
188 | MODULE_LICENSE("GPL"); | |
189 | ||
190 | EXPORT_SYMBOL(sh_bus_types); | |
191 | EXPORT_SYMBOL(sh_device_register); | |
192 | EXPORT_SYMBOL(sh_device_unregister); | |
193 | EXPORT_SYMBOL(sh_driver_register); | |
194 | EXPORT_SYMBOL(sh_driver_unregister); | |
195 |