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 extern struct kset devices_subsys; /* needed for vio_find_name() */
42 static struct bus_type vio_bus_type;
44 static struct vio_dev vio_bus_device = { /* fake "parent" device */
45 .name = vio_bus_device.dev.bus_id,
48 .dev.bus = &vio_bus_type,
51 static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
53 const unsigned char *dma_window;
54 struct iommu_table *tbl;
55 unsigned long offset, size;
57 if (firmware_has_feature(FW_FEATURE_ISERIES))
58 return vio_build_iommu_table_iseries(dev);
60 dma_window = of_get_property(dev->dev.archdata.of_node,
61 "ibm,my-dma-window", NULL);
65 tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
67 of_parse_dma_window(dev->dev.archdata.of_node, dma_window,
68 &tbl->it_index, &offset, &size);
70 /* TCE table size - measured in tce entries */
71 tbl->it_size = size >> IOMMU_PAGE_SHIFT;
72 /* offset for VIO should always be 0 */
73 tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
75 tbl->it_type = TCE_VB;
77 return iommu_init_table(tbl, -1);
81 * vio_match_device: - Tell if a VIO device has a matching
82 * VIO device id structure.
83 * @ids: array of VIO device id structures to search in
84 * @dev: the VIO device structure to match against
86 * Used by a driver to check whether a VIO device present in the
87 * system is in its list of supported devices. Returns the matching
88 * vio_device_id structure or NULL if there is no match.
90 static const struct vio_device_id *vio_match_device(
91 const struct vio_device_id *ids, const struct vio_dev *dev)
93 while (ids->type[0] != '\0') {
94 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
95 of_device_is_compatible(dev->dev.archdata.of_node,
104 * Convert from struct device to struct vio_dev and pass to driver.
105 * dev->driver has already been set by generic code because vio_bus_match
108 static int vio_bus_probe(struct device *dev)
110 struct vio_dev *viodev = to_vio_dev(dev);
111 struct vio_driver *viodrv = to_vio_driver(dev->driver);
112 const struct vio_device_id *id;
118 id = vio_match_device(viodrv->id_table, viodev);
120 error = viodrv->probe(viodev, id);
125 /* convert from struct device to struct vio_dev and pass to driver. */
126 static int vio_bus_remove(struct device *dev)
128 struct vio_dev *viodev = to_vio_dev(dev);
129 struct vio_driver *viodrv = to_vio_driver(dev->driver);
132 return viodrv->remove(viodev);
134 /* driver can't remove */
139 * vio_register_driver: - Register a new vio driver
140 * @drv: The vio_driver structure to be registered.
142 int vio_register_driver(struct vio_driver *viodrv)
144 printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
145 viodrv->driver.name);
147 /* fill in 'struct driver' fields */
148 viodrv->driver.bus = &vio_bus_type;
150 return driver_register(&viodrv->driver);
152 EXPORT_SYMBOL(vio_register_driver);
155 * vio_unregister_driver - Remove registration of vio driver.
156 * @driver: The vio_driver struct to be removed form registration
158 void vio_unregister_driver(struct vio_driver *viodrv)
160 driver_unregister(&viodrv->driver);
162 EXPORT_SYMBOL(vio_unregister_driver);
164 /* vio_dev refcount hit 0 */
165 static void __devinit vio_dev_release(struct device *dev)
167 /* XXX should free TCE table */
168 of_node_put(dev->archdata.of_node);
169 kfree(to_vio_dev(dev));
173 * vio_register_device_node: - Register a new vio device.
174 * @of_node: The OF node for this device.
176 * Creates and initializes a vio_dev structure from the data in
177 * of_node and adds it to the list of virtual devices.
178 * Returns a pointer to the created vio_dev or NULL if node has
179 * NULL device_type or compatible fields.
181 struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
183 struct vio_dev *viodev;
184 const unsigned int *unit_address;
186 /* we need the 'device_type' property, in order to match with drivers */
187 if (of_node->type == NULL) {
188 printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
190 of_node->name ? of_node->name : "<unknown>");
194 unit_address = of_get_property(of_node, "reg", NULL);
195 if (unit_address == NULL) {
196 printk(KERN_WARNING "%s: node %s missing 'reg'\n",
198 of_node->name ? of_node->name : "<unknown>");
202 /* allocate a vio_dev for this node */
203 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
207 viodev->irq = irq_of_parse_and_map(of_node, 0);
209 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
210 viodev->name = of_node->name;
211 viodev->type = of_node->type;
212 viodev->unit_address = *unit_address;
213 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
214 unit_address = of_get_property(of_node,
215 "linux,unit_address", NULL);
216 if (unit_address != NULL)
217 viodev->unit_address = *unit_address;
219 viodev->dev.archdata.of_node = of_node_get(of_node);
220 viodev->dev.archdata.dma_ops = &dma_iommu_ops;
221 viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev);
222 viodev->dev.archdata.numa_node = of_node_to_nid(of_node);
224 /* init generic 'struct device' fields: */
225 viodev->dev.parent = &vio_bus_device.dev;
226 viodev->dev.bus = &vio_bus_type;
227 viodev->dev.release = vio_dev_release;
229 /* register with generic device framework */
230 if (device_register(&viodev->dev)) {
231 printk(KERN_ERR "%s: failed to register device %s\n",
232 __FUNCTION__, viodev->dev.bus_id);
233 /* XXX free TCE table */
240 EXPORT_SYMBOL(vio_register_device_node);
243 * vio_bus_init: - Initialize the virtual IO bus
245 static int __init vio_bus_init(void)
248 struct device_node *node_vroot;
250 err = bus_register(&vio_bus_type);
252 printk(KERN_ERR "failed to register VIO bus\n");
257 * The fake parent of all vio devices, just to give us
260 err = device_register(&vio_bus_device.dev);
262 printk(KERN_WARNING "%s: device_register returned %i\n",
267 node_vroot = of_find_node_by_name(NULL, "vdevice");
269 struct device_node *of_node;
272 * Create struct vio_devices for each virtual device in
273 * the device tree. Drivers will associate with them later.
275 for (of_node = node_vroot->child; of_node != NULL;
276 of_node = of_node->sibling)
277 vio_register_device_node(of_node);
278 of_node_put(node_vroot);
283 __initcall(vio_bus_init);
285 static ssize_t name_show(struct device *dev,
286 struct device_attribute *attr, char *buf)
288 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
291 static ssize_t devspec_show(struct device *dev,
292 struct device_attribute *attr, char *buf)
294 struct device_node *of_node = dev->archdata.of_node;
296 return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
299 static struct device_attribute vio_dev_attrs[] = {
305 void __devinit vio_unregister_device(struct vio_dev *viodev)
307 device_unregister(&viodev->dev);
309 EXPORT_SYMBOL(vio_unregister_device);
311 static int vio_bus_match(struct device *dev, struct device_driver *drv)
313 const struct vio_dev *vio_dev = to_vio_dev(dev);
314 struct vio_driver *vio_drv = to_vio_driver(drv);
315 const struct vio_device_id *ids = vio_drv->id_table;
317 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
320 static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env)
322 const struct vio_dev *vio_dev = to_vio_dev(dev);
323 struct device_node *dn;
326 dn = dev->archdata.of_node;
329 cp = of_get_property(dn, "compatible", NULL);
333 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp);
337 static struct bus_type vio_bus_type = {
339 .dev_attrs = vio_dev_attrs,
340 .uevent = vio_hotplug,
341 .match = vio_bus_match,
342 .probe = vio_bus_probe,
343 .remove = vio_bus_remove,
347 * vio_get_attribute: - get attribute for virtual device
348 * @vdev: The vio device to get property.
349 * @which: The property/attribute to be extracted.
350 * @length: Pointer to length of returned data size (unused if NULL).
352 * Calls prom.c's of_get_property() to return the value of the
353 * attribute specified by @which
355 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
357 return of_get_property(vdev->dev.archdata.of_node, which, length);
359 EXPORT_SYMBOL(vio_get_attribute);
361 #ifdef CONFIG_PPC_PSERIES
362 /* vio_find_name() - internal because only vio.c knows how we formatted the
364 * XXX once vio_bus_type.devices is actually used as a kset in
365 * drivers/base/bus.c, this function should be removed in favor of
366 * "device_find(kobj_name, &vio_bus_type)"
368 static struct vio_dev *vio_find_name(const char *kobj_name)
370 struct kobject *found;
372 found = kset_find_obj(&devices_subsys, kobj_name);
376 return to_vio_dev(container_of(found, struct device, kobj));
380 * vio_find_node - find an already-registered vio_dev
381 * @vnode: device_node of the virtual device we're looking for
383 struct vio_dev *vio_find_node(struct device_node *vnode)
385 const uint32_t *unit_address;
386 char kobj_name[BUS_ID_SIZE];
388 /* construct the kobject name from the device node */
389 unit_address = of_get_property(vnode, "reg", NULL);
392 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
394 return vio_find_name(kobj_name);
396 EXPORT_SYMBOL(vio_find_node);
398 int vio_enable_interrupts(struct vio_dev *dev)
400 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
402 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
405 EXPORT_SYMBOL(vio_enable_interrupts);
407 int vio_disable_interrupts(struct vio_dev *dev)
409 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
411 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
414 EXPORT_SYMBOL(vio_disable_interrupts);
415 #endif /* CONFIG_PPC_PSERIES */