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1da177e4 LT |
1 | /* |
2 | * IBM PowerPC Virtual I/O Infrastructure Support. | |
3 | * | |
19dbd0f6 | 4 | * Copyright (c) 2003-2005 IBM Corp. |
1da177e4 LT |
5 | * Dave Engebretsen engebret@us.ibm.com |
6 | * Santiago Leon santil@us.ibm.com | |
7 | * Hollis Blanchard <hollisb@us.ibm.com> | |
19dbd0f6 | 8 | * Stephen Rothwell |
1da177e4 LT |
9 | * |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * as published by the Free Software Foundation; either version | |
13 | * 2 of the License, or (at your option) any later version. | |
14 | */ | |
15 | ||
16 | #include <linux/init.h> | |
17 | #include <linux/console.h> | |
1da177e4 | 18 | #include <linux/module.h> |
1da177e4 LT |
19 | #include <linux/mm.h> |
20 | #include <linux/dma-mapping.h> | |
1da177e4 LT |
21 | #include <asm/iommu.h> |
22 | #include <asm/dma.h> | |
1da177e4 | 23 | #include <asm/vio.h> |
1da177e4 LT |
24 | |
25 | static const struct vio_device_id *vio_match_device( | |
26 | const struct vio_device_id *, const struct vio_dev *); | |
27 | ||
3e494c80 | 28 | struct vio_dev vio_bus_device = { /* fake "parent" device */ |
ac5b33c9 SR |
29 | .name = vio_bus_device.dev.bus_id, |
30 | .type = "", | |
ac5b33c9 SR |
31 | .dev.bus_id = "vio", |
32 | .dev.bus = &vio_bus_type, | |
1da177e4 | 33 | }; |
ac5b33c9 | 34 | |
6312236f SR |
35 | static int (*is_match)(const struct vio_device_id *id, |
36 | const struct vio_dev *dev); | |
19dbd0f6 SR |
37 | static void (*unregister_device_callback)(struct vio_dev *dev); |
38 | static void (*release_device_callback)(struct device *dev); | |
1da177e4 LT |
39 | |
40 | /* convert from struct device to struct vio_dev and pass to driver. | |
41 | * dev->driver has already been set by generic code because vio_bus_match | |
42 | * succeeded. */ | |
43 | static int vio_bus_probe(struct device *dev) | |
44 | { | |
45 | struct vio_dev *viodev = to_vio_dev(dev); | |
46 | struct vio_driver *viodrv = to_vio_driver(dev->driver); | |
47 | const struct vio_device_id *id; | |
48 | int error = -ENODEV; | |
49 | ||
1da177e4 LT |
50 | if (!viodrv->probe) |
51 | return error; | |
52 | ||
53 | id = vio_match_device(viodrv->id_table, viodev); | |
54 | if (id) { | |
55 | error = viodrv->probe(viodev, id); | |
56 | } | |
57 | ||
58 | return error; | |
59 | } | |
60 | ||
61 | /* convert from struct device to struct vio_dev and pass to driver. */ | |
62 | static int vio_bus_remove(struct device *dev) | |
63 | { | |
64 | struct vio_dev *viodev = to_vio_dev(dev); | |
65 | struct vio_driver *viodrv = to_vio_driver(dev->driver); | |
66 | ||
1da177e4 LT |
67 | if (viodrv->remove) { |
68 | return viodrv->remove(viodev); | |
69 | } | |
70 | ||
71 | /* driver can't remove */ | |
72 | return 1; | |
73 | } | |
74 | ||
75 | /** | |
76 | * vio_register_driver: - Register a new vio driver | |
77 | * @drv: The vio_driver structure to be registered. | |
78 | */ | |
79 | int vio_register_driver(struct vio_driver *viodrv) | |
80 | { | |
81 | printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__, | |
82 | viodrv->name); | |
83 | ||
84 | /* fill in 'struct driver' fields */ | |
85 | viodrv->driver.name = viodrv->name; | |
86 | viodrv->driver.bus = &vio_bus_type; | |
87 | viodrv->driver.probe = vio_bus_probe; | |
88 | viodrv->driver.remove = vio_bus_remove; | |
89 | ||
90 | return driver_register(&viodrv->driver); | |
91 | } | |
92 | EXPORT_SYMBOL(vio_register_driver); | |
93 | ||
94 | /** | |
95 | * vio_unregister_driver - Remove registration of vio driver. | |
96 | * @driver: The vio_driver struct to be removed form registration | |
97 | */ | |
98 | void vio_unregister_driver(struct vio_driver *viodrv) | |
99 | { | |
100 | driver_unregister(&viodrv->driver); | |
101 | } | |
102 | EXPORT_SYMBOL(vio_unregister_driver); | |
103 | ||
104 | /** | |
105 | * vio_match_device: - Tell if a VIO device has a matching VIO device id structure. | |
106 | * @ids: array of VIO device id structures to search in | |
107 | * @dev: the VIO device structure to match against | |
108 | * | |
109 | * Used by a driver to check whether a VIO device present in the | |
110 | * system is in its list of supported devices. Returns the matching | |
111 | * vio_device_id structure or NULL if there is no match. | |
112 | */ | |
113 | static const struct vio_device_id * vio_match_device(const struct vio_device_id *ids, | |
114 | const struct vio_dev *dev) | |
115 | { | |
1da177e4 | 116 | while (ids->type) { |
6312236f | 117 | if (is_match(ids, dev)) |
1da177e4 LT |
118 | return ids; |
119 | ids++; | |
120 | } | |
121 | return NULL; | |
122 | } | |
123 | ||
1da177e4 LT |
124 | /** |
125 | * vio_bus_init: - Initialize the virtual IO bus | |
126 | */ | |
6312236f | 127 | int __init vio_bus_init(int (*match_func)(const struct vio_device_id *id, |
19dbd0f6 SR |
128 | const struct vio_dev *dev), |
129 | void (*unregister_dev)(struct vio_dev *), | |
130 | void (*release_dev)(struct device *)) | |
1da177e4 LT |
131 | { |
132 | int err; | |
133 | ||
6312236f | 134 | is_match = match_func; |
19dbd0f6 SR |
135 | unregister_device_callback = unregister_dev; |
136 | release_device_callback = release_dev; | |
6312236f | 137 | |
1da177e4 LT |
138 | err = bus_register(&vio_bus_type); |
139 | if (err) { | |
140 | printk(KERN_ERR "failed to register VIO bus\n"); | |
141 | return err; | |
142 | } | |
143 | ||
3e494c80 SR |
144 | /* the fake parent of all vio devices, just to give us |
145 | * a nice directory | |
146 | */ | |
ac5b33c9 | 147 | err = device_register(&vio_bus_device.dev); |
1da177e4 | 148 | if (err) { |
3e494c80 SR |
149 | printk(KERN_WARNING "%s: device_register returned %i\n", |
150 | __FUNCTION__, err); | |
1da177e4 LT |
151 | return err; |
152 | } | |
153 | ||
3e494c80 SR |
154 | return 0; |
155 | } | |
156 | ||
1da177e4 LT |
157 | /* vio_dev refcount hit 0 */ |
158 | static void __devinit vio_dev_release(struct device *dev) | |
159 | { | |
19dbd0f6 SR |
160 | if (release_device_callback) |
161 | release_device_callback(dev); | |
1da177e4 LT |
162 | kfree(to_vio_dev(dev)); |
163 | } | |
164 | ||
ff381d22 | 165 | static ssize_t viodev_show_name(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
166 | { |
167 | return sprintf(buf, "%s\n", to_vio_dev(dev)->name); | |
168 | } | |
169 | DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL); | |
170 | ||
3e494c80 | 171 | struct vio_dev * __devinit vio_register_device_common( |
1da177e4 LT |
172 | struct vio_dev *viodev, char *name, char *type, |
173 | uint32_t unit_address, struct iommu_table *iommu_table) | |
174 | { | |
1da177e4 LT |
175 | viodev->name = name; |
176 | viodev->type = type; | |
177 | viodev->unit_address = unit_address; | |
178 | viodev->iommu_table = iommu_table; | |
179 | /* init generic 'struct device' fields: */ | |
ac5b33c9 | 180 | viodev->dev.parent = &vio_bus_device.dev; |
1da177e4 LT |
181 | viodev->dev.bus = &vio_bus_type; |
182 | viodev->dev.release = vio_dev_release; | |
183 | ||
184 | /* register with generic device framework */ | |
185 | if (device_register(&viodev->dev)) { | |
186 | printk(KERN_ERR "%s: failed to register device %s\n", | |
187 | __FUNCTION__, viodev->dev.bus_id); | |
188 | return NULL; | |
189 | } | |
190 | device_create_file(&viodev->dev, &dev_attr_name); | |
191 | ||
192 | return viodev; | |
193 | } | |
194 | ||
1da177e4 LT |
195 | void __devinit vio_unregister_device(struct vio_dev *viodev) |
196 | { | |
19dbd0f6 SR |
197 | if (unregister_device_callback) |
198 | unregister_device_callback(viodev); | |
1da177e4 LT |
199 | device_remove_file(&viodev->dev, &dev_attr_name); |
200 | device_unregister(&viodev->dev); | |
201 | } | |
202 | EXPORT_SYMBOL(vio_unregister_device); | |
203 | ||
1da177e4 LT |
204 | static dma_addr_t vio_map_single(struct device *dev, void *vaddr, |
205 | size_t size, enum dma_data_direction direction) | |
206 | { | |
207 | return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size, | |
208 | direction); | |
209 | } | |
210 | ||
211 | static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle, | |
212 | size_t size, enum dma_data_direction direction) | |
213 | { | |
214 | iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size, | |
215 | direction); | |
216 | } | |
217 | ||
218 | static int vio_map_sg(struct device *dev, struct scatterlist *sglist, | |
219 | int nelems, enum dma_data_direction direction) | |
220 | { | |
221 | return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist, | |
222 | nelems, direction); | |
223 | } | |
224 | ||
225 | static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist, | |
226 | int nelems, enum dma_data_direction direction) | |
227 | { | |
228 | iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction); | |
229 | } | |
230 | ||
231 | static void *vio_alloc_coherent(struct device *dev, size_t size, | |
232 | dma_addr_t *dma_handle, unsigned int __nocast flag) | |
233 | { | |
234 | return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size, | |
235 | dma_handle, flag); | |
236 | } | |
237 | ||
238 | static void vio_free_coherent(struct device *dev, size_t size, | |
239 | void *vaddr, dma_addr_t dma_handle) | |
240 | { | |
241 | iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr, | |
242 | dma_handle); | |
243 | } | |
244 | ||
245 | static int vio_dma_supported(struct device *dev, u64 mask) | |
246 | { | |
247 | return 1; | |
248 | } | |
249 | ||
250 | struct dma_mapping_ops vio_dma_ops = { | |
251 | .alloc_coherent = vio_alloc_coherent, | |
252 | .free_coherent = vio_free_coherent, | |
253 | .map_single = vio_map_single, | |
254 | .unmap_single = vio_unmap_single, | |
255 | .map_sg = vio_map_sg, | |
256 | .unmap_sg = vio_unmap_sg, | |
257 | .dma_supported = vio_dma_supported, | |
258 | }; | |
259 | ||
260 | static int vio_bus_match(struct device *dev, struct device_driver *drv) | |
261 | { | |
262 | const struct vio_dev *vio_dev = to_vio_dev(dev); | |
263 | struct vio_driver *vio_drv = to_vio_driver(drv); | |
264 | const struct vio_device_id *ids = vio_drv->id_table; | |
265 | const struct vio_device_id *found_id; | |
266 | ||
1da177e4 LT |
267 | if (!ids) |
268 | return 0; | |
269 | ||
270 | found_id = vio_match_device(ids, vio_dev); | |
271 | if (found_id) | |
272 | return 1; | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | struct bus_type vio_bus_type = { | |
278 | .name = "vio", | |
279 | .match = vio_bus_match, | |
280 | }; |