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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 | |
71d276d7 | 35 | static struct vio_bus_ops vio_bus_ops; |
1da177e4 | 36 | |
5c0b4b87 SR |
37 | /* |
38 | * Convert from struct device to struct vio_dev and pass to driver. | |
1da177e4 | 39 | * dev->driver has already been set by generic code because vio_bus_match |
5c0b4b87 SR |
40 | * succeeded. |
41 | */ | |
1da177e4 LT |
42 | static int vio_bus_probe(struct device *dev) |
43 | { | |
44 | struct vio_dev *viodev = to_vio_dev(dev); | |
45 | struct vio_driver *viodrv = to_vio_driver(dev->driver); | |
46 | const struct vio_device_id *id; | |
47 | int error = -ENODEV; | |
48 | ||
1da177e4 LT |
49 | if (!viodrv->probe) |
50 | return error; | |
51 | ||
52 | id = vio_match_device(viodrv->id_table, viodev); | |
5c0b4b87 | 53 | if (id) |
1da177e4 | 54 | error = viodrv->probe(viodev, id); |
1da177e4 LT |
55 | |
56 | return error; | |
57 | } | |
58 | ||
59 | /* convert from struct device to struct vio_dev and pass to driver. */ | |
60 | static int vio_bus_remove(struct device *dev) | |
61 | { | |
62 | struct vio_dev *viodev = to_vio_dev(dev); | |
63 | struct vio_driver *viodrv = to_vio_driver(dev->driver); | |
64 | ||
5c0b4b87 | 65 | if (viodrv->remove) |
1da177e4 | 66 | return viodrv->remove(viodev); |
1da177e4 LT |
67 | |
68 | /* driver can't remove */ | |
69 | return 1; | |
70 | } | |
71 | ||
72 | /** | |
73 | * vio_register_driver: - Register a new vio driver | |
74 | * @drv: The vio_driver structure to be registered. | |
75 | */ | |
76 | int vio_register_driver(struct vio_driver *viodrv) | |
77 | { | |
78 | printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__, | |
79 | viodrv->name); | |
80 | ||
81 | /* fill in 'struct driver' fields */ | |
82 | viodrv->driver.name = viodrv->name; | |
83 | viodrv->driver.bus = &vio_bus_type; | |
84 | viodrv->driver.probe = vio_bus_probe; | |
85 | viodrv->driver.remove = vio_bus_remove; | |
86 | ||
87 | return driver_register(&viodrv->driver); | |
88 | } | |
89 | EXPORT_SYMBOL(vio_register_driver); | |
90 | ||
91 | /** | |
92 | * vio_unregister_driver - Remove registration of vio driver. | |
93 | * @driver: The vio_driver struct to be removed form registration | |
94 | */ | |
95 | void vio_unregister_driver(struct vio_driver *viodrv) | |
96 | { | |
97 | driver_unregister(&viodrv->driver); | |
98 | } | |
99 | EXPORT_SYMBOL(vio_unregister_driver); | |
100 | ||
101 | /** | |
5c0b4b87 SR |
102 | * vio_match_device: - Tell if a VIO device has a matching |
103 | * VIO device id structure. | |
104 | * @ids: array of VIO device id structures to search in | |
105 | * @dev: the VIO device structure to match against | |
1da177e4 LT |
106 | * |
107 | * Used by a driver to check whether a VIO device present in the | |
108 | * system is in its list of supported devices. Returns the matching | |
109 | * vio_device_id structure or NULL if there is no match. | |
110 | */ | |
5c0b4b87 SR |
111 | static const struct vio_device_id *vio_match_device( |
112 | const struct vio_device_id *ids, const struct vio_dev *dev) | |
1da177e4 | 113 | { |
fb120da6 | 114 | while (ids->type[0] != '\0') { |
71d276d7 | 115 | if (vio_bus_ops.match(ids, dev)) |
1da177e4 LT |
116 | return ids; |
117 | ids++; | |
118 | } | |
119 | return NULL; | |
120 | } | |
121 | ||
1da177e4 LT |
122 | /** |
123 | * vio_bus_init: - Initialize the virtual IO bus | |
124 | */ | |
71d276d7 | 125 | int __init vio_bus_init(struct vio_bus_ops *ops) |
1da177e4 LT |
126 | { |
127 | int err; | |
128 | ||
71d276d7 | 129 | vio_bus_ops = *ops; |
6312236f | 130 | |
1da177e4 LT |
131 | err = bus_register(&vio_bus_type); |
132 | if (err) { | |
133 | printk(KERN_ERR "failed to register VIO bus\n"); | |
134 | return err; | |
135 | } | |
136 | ||
5c0b4b87 SR |
137 | /* |
138 | * The fake parent of all vio devices, just to give us | |
3e494c80 SR |
139 | * a nice directory |
140 | */ | |
ac5b33c9 | 141 | err = device_register(&vio_bus_device.dev); |
1da177e4 | 142 | if (err) { |
3e494c80 SR |
143 | printk(KERN_WARNING "%s: device_register returned %i\n", |
144 | __FUNCTION__, err); | |
1da177e4 LT |
145 | return err; |
146 | } | |
147 | ||
3e494c80 SR |
148 | return 0; |
149 | } | |
150 | ||
1da177e4 LT |
151 | /* vio_dev refcount hit 0 */ |
152 | static void __devinit vio_dev_release(struct device *dev) | |
153 | { | |
71d276d7 SR |
154 | if (vio_bus_ops.release_device) |
155 | vio_bus_ops.release_device(dev); | |
1da177e4 LT |
156 | kfree(to_vio_dev(dev)); |
157 | } | |
158 | ||
5c0b4b87 SR |
159 | static ssize_t viodev_show_name(struct device *dev, |
160 | struct device_attribute *attr, char *buf) | |
1da177e4 LT |
161 | { |
162 | return sprintf(buf, "%s\n", to_vio_dev(dev)->name); | |
163 | } | |
164 | DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL); | |
165 | ||
b877b90f | 166 | struct vio_dev * __devinit vio_register_device(struct vio_dev *viodev) |
1da177e4 | 167 | { |
1da177e4 | 168 | /* init generic 'struct device' fields: */ |
ac5b33c9 | 169 | viodev->dev.parent = &vio_bus_device.dev; |
1da177e4 LT |
170 | viodev->dev.bus = &vio_bus_type; |
171 | viodev->dev.release = vio_dev_release; | |
172 | ||
173 | /* register with generic device framework */ | |
174 | if (device_register(&viodev->dev)) { | |
175 | printk(KERN_ERR "%s: failed to register device %s\n", | |
176 | __FUNCTION__, viodev->dev.bus_id); | |
177 | return NULL; | |
178 | } | |
179 | device_create_file(&viodev->dev, &dev_attr_name); | |
180 | ||
181 | return viodev; | |
182 | } | |
183 | ||
1da177e4 LT |
184 | void __devinit vio_unregister_device(struct vio_dev *viodev) |
185 | { | |
71d276d7 SR |
186 | if (vio_bus_ops.unregister_device) |
187 | vio_bus_ops.unregister_device(viodev); | |
1da177e4 LT |
188 | device_remove_file(&viodev->dev, &dev_attr_name); |
189 | device_unregister(&viodev->dev); | |
190 | } | |
191 | EXPORT_SYMBOL(vio_unregister_device); | |
192 | ||
1da177e4 LT |
193 | static dma_addr_t vio_map_single(struct device *dev, void *vaddr, |
194 | size_t size, enum dma_data_direction direction) | |
195 | { | |
196 | return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size, | |
197 | direction); | |
198 | } | |
199 | ||
200 | static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle, | |
201 | size_t size, enum dma_data_direction direction) | |
202 | { | |
203 | iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size, | |
204 | direction); | |
205 | } | |
206 | ||
207 | static int vio_map_sg(struct device *dev, struct scatterlist *sglist, | |
208 | int nelems, enum dma_data_direction direction) | |
209 | { | |
210 | return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist, | |
211 | nelems, direction); | |
212 | } | |
213 | ||
214 | static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist, | |
215 | int nelems, enum dma_data_direction direction) | |
216 | { | |
217 | iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction); | |
218 | } | |
219 | ||
220 | static void *vio_alloc_coherent(struct device *dev, size_t size, | |
221 | dma_addr_t *dma_handle, unsigned int __nocast flag) | |
222 | { | |
223 | return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size, | |
224 | dma_handle, flag); | |
225 | } | |
226 | ||
227 | static void vio_free_coherent(struct device *dev, size_t size, | |
228 | void *vaddr, dma_addr_t dma_handle) | |
229 | { | |
230 | iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr, | |
231 | dma_handle); | |
232 | } | |
233 | ||
234 | static int vio_dma_supported(struct device *dev, u64 mask) | |
235 | { | |
236 | return 1; | |
237 | } | |
238 | ||
239 | struct dma_mapping_ops vio_dma_ops = { | |
240 | .alloc_coherent = vio_alloc_coherent, | |
241 | .free_coherent = vio_free_coherent, | |
242 | .map_single = vio_map_single, | |
243 | .unmap_single = vio_unmap_single, | |
244 | .map_sg = vio_map_sg, | |
245 | .unmap_sg = vio_unmap_sg, | |
246 | .dma_supported = vio_dma_supported, | |
247 | }; | |
248 | ||
249 | static int vio_bus_match(struct device *dev, struct device_driver *drv) | |
250 | { | |
251 | const struct vio_dev *vio_dev = to_vio_dev(dev); | |
252 | struct vio_driver *vio_drv = to_vio_driver(drv); | |
253 | const struct vio_device_id *ids = vio_drv->id_table; | |
1da177e4 | 254 | |
5c0b4b87 | 255 | return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL); |
1da177e4 LT |
256 | } |
257 | ||
258 | struct bus_type vio_bus_type = { | |
259 | .name = "vio", | |
260 | .match = vio_bus_match, | |
261 | }; |