2 * IBM PowerPC Virtual I/O Infrastructure Support.
4 * Copyright (c) 2003-2005 IBM Corp.
5 * Dave Engebretsen engebret@us.ibm.com
6 * Santiago Leon santil@us.ibm.com
7 * Hollis Blanchard <hollisb@us.ibm.com>
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.
16 #include <linux/init.h>
17 #include <linux/console.h>
18 #include <linux/module.h>
20 #include <linux/dma-mapping.h>
21 #include <asm/iommu.h>
26 static const struct vio_device_id *vio_match_device(
27 const struct vio_device_id *, const struct vio_dev *);
29 struct vio_dev vio_bus_device = { /* fake "parent" device */
30 .name = vio_bus_device.dev.bus_id,
33 .dev.bus = &vio_bus_type,
36 static struct vio_bus_ops vio_bus_ops;
39 * Convert from struct device to struct vio_dev and pass to driver.
40 * dev->driver has already been set by generic code because vio_bus_match
43 static int vio_bus_probe(struct device *dev)
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;
53 id = vio_match_device(viodrv->id_table, viodev);
55 error = viodrv->probe(viodev, id);
60 /* convert from struct device to struct vio_dev and pass to driver. */
61 static int vio_bus_remove(struct device *dev)
63 struct vio_dev *viodev = to_vio_dev(dev);
64 struct vio_driver *viodrv = to_vio_driver(dev->driver);
67 return viodrv->remove(viodev);
69 /* driver can't remove */
73 /* convert from struct device to struct vio_dev and pass to driver. */
74 static void vio_bus_shutdown(struct device *dev)
76 struct vio_dev *viodev = to_vio_dev(dev);
77 struct vio_driver *viodrv = to_vio_driver(dev->driver);
80 viodrv->shutdown(viodev);
84 * vio_register_driver: - Register a new vio driver
85 * @drv: The vio_driver structure to be registered.
87 int vio_register_driver(struct vio_driver *viodrv)
89 printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
92 /* fill in 'struct driver' fields */
93 viodrv->driver.bus = &vio_bus_type;
94 viodrv->driver.probe = vio_bus_probe;
95 viodrv->driver.remove = vio_bus_remove;
96 viodrv->driver.shutdown = vio_bus_shutdown;
98 return driver_register(&viodrv->driver);
100 EXPORT_SYMBOL(vio_register_driver);
103 * vio_unregister_driver - Remove registration of vio driver.
104 * @driver: The vio_driver struct to be removed form registration
106 void vio_unregister_driver(struct vio_driver *viodrv)
108 driver_unregister(&viodrv->driver);
110 EXPORT_SYMBOL(vio_unregister_driver);
113 * vio_match_device: - Tell if a VIO device has a matching
114 * VIO device id structure.
115 * @ids: array of VIO device id structures to search in
116 * @dev: the VIO device structure to match against
118 * Used by a driver to check whether a VIO device present in the
119 * system is in its list of supported devices. Returns the matching
120 * vio_device_id structure or NULL if there is no match.
122 static const struct vio_device_id *vio_match_device(
123 const struct vio_device_id *ids, const struct vio_dev *dev)
125 while (ids->type[0] != '\0') {
126 if (vio_bus_ops.match(ids, dev))
134 * vio_bus_init: - Initialize the virtual IO bus
136 int __init vio_bus_init(struct vio_bus_ops *ops)
142 err = bus_register(&vio_bus_type);
144 printk(KERN_ERR "failed to register VIO bus\n");
149 * The fake parent of all vio devices, just to give us
152 err = device_register(&vio_bus_device.dev);
154 printk(KERN_WARNING "%s: device_register returned %i\n",
162 /* vio_dev refcount hit 0 */
163 static void __devinit vio_dev_release(struct device *dev)
165 if (vio_bus_ops.release_device)
166 vio_bus_ops.release_device(dev);
167 kfree(to_vio_dev(dev));
170 static ssize_t viodev_show_name(struct device *dev,
171 struct device_attribute *attr, char *buf)
173 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
175 DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL);
177 struct vio_dev * __devinit vio_register_device(struct vio_dev *viodev)
179 /* init generic 'struct device' fields: */
180 viodev->dev.parent = &vio_bus_device.dev;
181 viodev->dev.bus = &vio_bus_type;
182 viodev->dev.release = vio_dev_release;
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);
190 device_create_file(&viodev->dev, &dev_attr_name);
195 void __devinit vio_unregister_device(struct vio_dev *viodev)
197 if (vio_bus_ops.unregister_device)
198 vio_bus_ops.unregister_device(viodev);
199 device_remove_file(&viodev->dev, &dev_attr_name);
200 device_unregister(&viodev->dev);
202 EXPORT_SYMBOL(vio_unregister_device);
204 static dma_addr_t vio_map_single(struct device *dev, void *vaddr,
205 size_t size, enum dma_data_direction direction)
207 return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size,
211 static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle,
212 size_t size, enum dma_data_direction direction)
214 iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size,
218 static int vio_map_sg(struct device *dev, struct scatterlist *sglist,
219 int nelems, enum dma_data_direction direction)
221 return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist,
225 static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist,
226 int nelems, enum dma_data_direction direction)
228 iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction);
231 static void *vio_alloc_coherent(struct device *dev, size_t size,
232 dma_addr_t *dma_handle, gfp_t flag)
234 return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size,
238 static void vio_free_coherent(struct device *dev, size_t size,
239 void *vaddr, dma_addr_t dma_handle)
241 iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr,
245 static int vio_dma_supported(struct device *dev, u64 mask)
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,
260 static int vio_bus_match(struct device *dev, struct device_driver *drv)
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;
266 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
269 static int vio_hotplug(struct device *dev, char **envp, int num_envp,
270 char *buffer, int buffer_size)
272 const struct vio_dev *vio_dev = to_vio_dev(dev);
279 if (!vio_dev->dev.platform_data)
281 cp = (char *)get_property(vio_dev->dev.platform_data, "compatible", &length);
286 length = scnprintf(buffer, buffer_size, "MODALIAS=vio:T%sS%s",
288 if (buffer_size - length <= 0)
294 struct bus_type vio_bus_type = {
296 .hotplug = vio_hotplug,
297 .match = vio_bus_match,