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/types.h>
17 #include <linux/device.h>
18 #include <linux/init.h>
19 #include <linux/console.h>
20 #include <linux/module.h>
22 #include <linux/dma-mapping.h>
23 #include <linux/kobject.h>
25 #include <asm/iommu.h>
29 #include <asm/firmware.h>
31 #include <asm/abs_addr.h>
33 #include <asm/hvcall.h>
34 #include <asm/iseries/vio.h>
35 #include <asm/iseries/hv_types.h>
36 #include <asm/iseries/hv_lp_config.h>
37 #include <asm/iseries/hv_call_xm.h>
38 #include <asm/iseries/iommu.h>
40 static struct bus_type vio_bus_type;
42 static struct vio_dev vio_bus_device = { /* fake "parent" device */
43 .name = vio_bus_device.dev.bus_id,
46 .dev.bus = &vio_bus_type,
49 static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
51 const unsigned char *dma_window;
52 struct iommu_table *tbl;
53 unsigned long offset, size;
55 if (firmware_has_feature(FW_FEATURE_ISERIES))
56 return vio_build_iommu_table_iseries(dev);
58 dma_window = of_get_property(dev->dev.archdata.of_node,
59 "ibm,my-dma-window", NULL);
63 tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
65 of_parse_dma_window(dev->dev.archdata.of_node, dma_window,
66 &tbl->it_index, &offset, &size);
68 /* TCE table size - measured in tce entries */
69 tbl->it_size = size >> IOMMU_PAGE_SHIFT;
70 /* offset for VIO should always be 0 */
71 tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
73 tbl->it_type = TCE_VB;
75 return iommu_init_table(tbl, -1);
79 * vio_match_device: - Tell if a VIO device has a matching
80 * VIO device id structure.
81 * @ids: array of VIO device id structures to search in
82 * @dev: the VIO device structure to match against
84 * Used by a driver to check whether a VIO device present in the
85 * system is in its list of supported devices. Returns the matching
86 * vio_device_id structure or NULL if there is no match.
88 static const struct vio_device_id *vio_match_device(
89 const struct vio_device_id *ids, const struct vio_dev *dev)
91 while (ids->type[0] != '\0') {
92 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
93 of_device_is_compatible(dev->dev.archdata.of_node,
102 * Convert from struct device to struct vio_dev and pass to driver.
103 * dev->driver has already been set by generic code because vio_bus_match
106 static int vio_bus_probe(struct device *dev)
108 struct vio_dev *viodev = to_vio_dev(dev);
109 struct vio_driver *viodrv = to_vio_driver(dev->driver);
110 const struct vio_device_id *id;
116 id = vio_match_device(viodrv->id_table, viodev);
118 error = viodrv->probe(viodev, id);
123 /* convert from struct device to struct vio_dev and pass to driver. */
124 static int vio_bus_remove(struct device *dev)
126 struct vio_dev *viodev = to_vio_dev(dev);
127 struct vio_driver *viodrv = to_vio_driver(dev->driver);
130 return viodrv->remove(viodev);
132 /* driver can't remove */
137 * vio_register_driver: - Register a new vio driver
138 * @drv: The vio_driver structure to be registered.
140 int vio_register_driver(struct vio_driver *viodrv)
142 printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
143 viodrv->driver.name);
145 /* fill in 'struct driver' fields */
146 viodrv->driver.bus = &vio_bus_type;
148 return driver_register(&viodrv->driver);
150 EXPORT_SYMBOL(vio_register_driver);
153 * vio_unregister_driver - Remove registration of vio driver.
154 * @driver: The vio_driver struct to be removed form registration
156 void vio_unregister_driver(struct vio_driver *viodrv)
158 driver_unregister(&viodrv->driver);
160 EXPORT_SYMBOL(vio_unregister_driver);
162 /* vio_dev refcount hit 0 */
163 static void __devinit vio_dev_release(struct device *dev)
165 /* XXX should free TCE table */
166 of_node_put(dev->archdata.of_node);
167 kfree(to_vio_dev(dev));
171 * vio_register_device_node: - Register a new vio device.
172 * @of_node: The OF node for this device.
174 * Creates and initializes a vio_dev structure from the data in
175 * of_node and adds it to the list of virtual devices.
176 * Returns a pointer to the created vio_dev or NULL if node has
177 * NULL device_type or compatible fields.
179 struct vio_dev *vio_register_device_node(struct device_node *of_node)
181 struct vio_dev *viodev;
182 const unsigned int *unit_address;
184 /* we need the 'device_type' property, in order to match with drivers */
185 if (of_node->type == NULL) {
186 printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
188 of_node->name ? of_node->name : "<unknown>");
192 unit_address = of_get_property(of_node, "reg", NULL);
193 if (unit_address == NULL) {
194 printk(KERN_WARNING "%s: node %s missing 'reg'\n",
196 of_node->name ? of_node->name : "<unknown>");
200 /* allocate a vio_dev for this node */
201 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
205 viodev->irq = irq_of_parse_and_map(of_node, 0);
207 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
208 viodev->name = of_node->name;
209 viodev->type = of_node->type;
210 viodev->unit_address = *unit_address;
211 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
212 unit_address = of_get_property(of_node,
213 "linux,unit_address", NULL);
214 if (unit_address != NULL)
215 viodev->unit_address = *unit_address;
217 viodev->dev.archdata.of_node = of_node_get(of_node);
218 viodev->dev.archdata.dma_ops = &dma_iommu_ops;
219 viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev);
220 viodev->dev.archdata.numa_node = of_node_to_nid(of_node);
222 /* init generic 'struct device' fields: */
223 viodev->dev.parent = &vio_bus_device.dev;
224 viodev->dev.bus = &vio_bus_type;
225 viodev->dev.release = vio_dev_release;
227 /* register with generic device framework */
228 if (device_register(&viodev->dev)) {
229 printk(KERN_ERR "%s: failed to register device %s\n",
230 __FUNCTION__, viodev->dev.bus_id);
231 /* XXX free TCE table */
238 EXPORT_SYMBOL(vio_register_device_node);
241 * vio_bus_init: - Initialize the virtual IO bus
243 static int __init vio_bus_init(void)
246 struct device_node *node_vroot;
248 err = bus_register(&vio_bus_type);
250 printk(KERN_ERR "failed to register VIO bus\n");
255 * The fake parent of all vio devices, just to give us
258 err = device_register(&vio_bus_device.dev);
260 printk(KERN_WARNING "%s: device_register returned %i\n",
265 node_vroot = of_find_node_by_name(NULL, "vdevice");
267 struct device_node *of_node;
270 * Create struct vio_devices for each virtual device in
271 * the device tree. Drivers will associate with them later.
273 for (of_node = node_vroot->child; of_node != NULL;
274 of_node = of_node->sibling)
275 vio_register_device_node(of_node);
276 of_node_put(node_vroot);
281 __initcall(vio_bus_init);
283 static ssize_t name_show(struct device *dev,
284 struct device_attribute *attr, char *buf)
286 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
289 static ssize_t devspec_show(struct device *dev,
290 struct device_attribute *attr, char *buf)
292 struct device_node *of_node = dev->archdata.of_node;
294 return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
297 static struct device_attribute vio_dev_attrs[] = {
303 void __devinit vio_unregister_device(struct vio_dev *viodev)
305 device_unregister(&viodev->dev);
307 EXPORT_SYMBOL(vio_unregister_device);
309 static int vio_bus_match(struct device *dev, struct device_driver *drv)
311 const struct vio_dev *vio_dev = to_vio_dev(dev);
312 struct vio_driver *vio_drv = to_vio_driver(drv);
313 const struct vio_device_id *ids = vio_drv->id_table;
315 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
318 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
320 const struct vio_dev *vio_dev = to_vio_dev(dev);
321 struct device_node *dn;
324 dn = dev->archdata.of_node;
327 cp = of_get_property(dn, "compatible", NULL);
331 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
335 static struct bus_type vio_bus_type = {
337 .dev_attrs = vio_dev_attrs,
338 .uevent = vio_hotplug,
339 .match = vio_bus_match,
340 .probe = vio_bus_probe,
341 .remove = vio_bus_remove,
345 * vio_get_attribute: - get attribute for virtual device
346 * @vdev: The vio device to get property.
347 * @which: The property/attribute to be extracted.
348 * @length: Pointer to length of returned data size (unused if NULL).
350 * Calls prom.c's of_get_property() to return the value of the
351 * attribute specified by @which
353 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
355 return of_get_property(vdev->dev.archdata.of_node, which, length);
357 EXPORT_SYMBOL(vio_get_attribute);
359 #ifdef CONFIG_PPC_PSERIES
360 /* vio_find_name() - internal because only vio.c knows how we formatted the
363 static struct vio_dev *vio_find_name(const char *name)
365 struct device *found;
367 found = bus_find_device_by_name(&vio_bus_type, NULL, name);
371 return to_vio_dev(found);
375 * vio_find_node - find an already-registered vio_dev
376 * @vnode: device_node of the virtual device we're looking for
378 struct vio_dev *vio_find_node(struct device_node *vnode)
380 const uint32_t *unit_address;
381 char kobj_name[BUS_ID_SIZE];
383 /* construct the kobject name from the device node */
384 unit_address = of_get_property(vnode, "reg", NULL);
387 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
389 return vio_find_name(kobj_name);
391 EXPORT_SYMBOL(vio_find_node);
393 int vio_enable_interrupts(struct vio_dev *dev)
395 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
397 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
400 EXPORT_SYMBOL(vio_enable_interrupts);
402 int vio_disable_interrupts(struct vio_dev *dev)
404 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
406 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
409 EXPORT_SYMBOL(vio_disable_interrupts);
410 #endif /* CONFIG_PPC_PSERIES */