2 * IBM PowerPC Virtual I/O Infrastructure Support.
4 * Copyright (c) 2003 IBM Corp.
5 * Dave Engebretsen engebret@us.ibm.com
6 * Santiago Leon santil@us.ibm.com
7 * Hollis Blanchard <hollisb@us.ibm.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
15 #include <linux/init.h>
16 #include <linux/console.h>
17 #include <linux/version.h>
18 #include <linux/module.h>
19 #include <linux/kobject.h>
21 #include <linux/dma-mapping.h>
23 #include <asm/iommu.h>
25 #include <asm/ppcdebug.h>
27 #include <asm/hvcall.h>
28 #include <asm/iSeries/vio.h>
29 #include <asm/iSeries/HvCallXm.h>
31 #define DBGENTER() pr_debug("%s entered\n", __FUNCTION__)
33 extern struct subsystem devices_subsys; /* needed for vio_find_name() */
35 struct iommu_table *vio_build_iommu_table(struct vio_dev *dev);
37 #ifdef CONFIG_PPC_PSERIES
38 static int vio_num_address_cells;
40 static struct vio_dev *vio_bus_device; /* fake "parent" device */
42 #ifdef CONFIG_PPC_ISERIES
43 static struct iommu_table veth_iommu_table;
44 static struct iommu_table vio_iommu_table;
46 static struct vio_dev _veth_dev = {
47 .iommu_table = &veth_iommu_table,
48 .dev.bus = &vio_bus_type
50 static struct vio_dev _vio_dev = {
51 .iommu_table = &vio_iommu_table,
52 .dev.bus = &vio_bus_type
55 struct vio_dev *iSeries_veth_dev = &_veth_dev;
56 struct device *iSeries_vio_dev = &_vio_dev.dev;
58 EXPORT_SYMBOL(iSeries_veth_dev);
59 EXPORT_SYMBOL(iSeries_vio_dev);
62 /* convert from struct device to struct vio_dev and pass to driver.
63 * dev->driver has already been set by generic code because vio_bus_match
65 static int vio_bus_probe(struct device *dev)
67 struct vio_dev *viodev = to_vio_dev(dev);
68 struct vio_driver *viodrv = to_vio_driver(dev->driver);
69 const struct vio_device_id *id;
77 id = vio_match_device(viodrv->id_table, viodev);
79 error = viodrv->probe(viodev, id);
85 /* convert from struct device to struct vio_dev and pass to driver. */
86 static int vio_bus_remove(struct device *dev)
88 struct vio_dev *viodev = to_vio_dev(dev);
89 struct vio_driver *viodrv = to_vio_driver(dev->driver);
94 return viodrv->remove(viodev);
97 /* driver can't remove */
102 * vio_register_driver: - Register a new vio driver
103 * @drv: The vio_driver structure to be registered.
105 int vio_register_driver(struct vio_driver *viodrv)
107 printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
110 /* fill in 'struct driver' fields */
111 viodrv->driver.name = viodrv->name;
112 viodrv->driver.bus = &vio_bus_type;
113 viodrv->driver.probe = vio_bus_probe;
114 viodrv->driver.remove = vio_bus_remove;
116 return driver_register(&viodrv->driver);
118 EXPORT_SYMBOL(vio_register_driver);
121 * vio_unregister_driver - Remove registration of vio driver.
122 * @driver: The vio_driver struct to be removed form registration
124 void vio_unregister_driver(struct vio_driver *viodrv)
126 driver_unregister(&viodrv->driver);
128 EXPORT_SYMBOL(vio_unregister_driver);
131 * vio_match_device: - Tell if a VIO device has a matching VIO device id structure.
132 * @ids: array of VIO device id structures to search in
133 * @dev: the VIO device structure to match against
135 * Used by a driver to check whether a VIO device present in the
136 * system is in its list of supported devices. Returns the matching
137 * vio_device_id structure or NULL if there is no match.
139 const struct vio_device_id * vio_match_device(const struct vio_device_id *ids,
140 const struct vio_dev *dev)
144 #ifdef CONFIG_PPC_PSERIES
146 if ((strncmp(dev->archdata->type, ids->type, strlen(ids->type)) == 0) &&
147 device_is_compatible((struct device_node*)dev->archdata, ids->compat))
155 #ifdef CONFIG_PPC_ISERIES
156 void __init iommu_vio_init(void)
158 struct iommu_table *t;
159 struct iommu_table_cb cb;
162 cb.itc_busno = 255; /* Bus 255 is the virtual bus */
163 cb.itc_virtbus = 0xff; /* Ask for virtual bus */
165 cbp = virt_to_abs(&cb);
166 HvCallXm_getTceTableParms(cbp);
168 veth_iommu_table.it_size = cb.itc_size / 2;
169 veth_iommu_table.it_busno = cb.itc_busno;
170 veth_iommu_table.it_offset = cb.itc_offset;
171 veth_iommu_table.it_index = cb.itc_index;
172 veth_iommu_table.it_type = TCE_VB;
173 veth_iommu_table.it_entrysize = sizeof(union tce_entry);
174 veth_iommu_table.it_blocksize = 1;
176 t = iommu_init_table(&veth_iommu_table);
179 printk("Virtual Bus VETH TCE table failed.\n");
181 vio_iommu_table.it_size = cb.itc_size - veth_iommu_table.it_size;
182 vio_iommu_table.it_busno = cb.itc_busno;
183 vio_iommu_table.it_offset = cb.itc_offset +
184 veth_iommu_table.it_size * (PAGE_SIZE/sizeof(union tce_entry));
185 vio_iommu_table.it_index = cb.itc_index;
186 vio_iommu_table.it_type = TCE_VB;
187 vio_iommu_table.it_entrysize = sizeof(union tce_entry);
188 vio_iommu_table.it_blocksize = 1;
190 t = iommu_init_table(&vio_iommu_table);
193 printk("Virtual Bus VIO TCE table failed.\n");
198 * vio_bus_init: - Initialize the virtual IO bus
200 static int __init vio_bus_init(void)
202 #ifdef CONFIG_PPC_PSERIES
203 struct device_node *node_vroot, *of_node;
207 err = bus_register(&vio_bus_type);
209 printk(KERN_ERR "failed to register VIO bus\n");
213 /* the fake parent of all vio devices, just to give us a nice directory */
214 vio_bus_device = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
215 if (!vio_bus_device) {
218 memset(vio_bus_device, 0, sizeof(struct vio_dev));
219 strcpy(vio_bus_device->dev.bus_id, "vio");
221 err = device_register(&vio_bus_device->dev);
223 printk(KERN_WARNING "%s: device_register returned %i\n", __FUNCTION__,
225 kfree(vio_bus_device);
229 #ifdef CONFIG_PPC_PSERIES
230 node_vroot = find_devices("vdevice");
231 if ((node_vroot == NULL) || (node_vroot->child == NULL)) {
232 /* this machine doesn't do virtual IO, and that's ok */
236 vio_num_address_cells = prom_n_addr_cells(node_vroot->child);
239 * Create struct vio_devices for each virtual device in the device tree.
240 * Drivers will associate with them later.
242 for (of_node = node_vroot->child;
244 of_node = of_node->sibling) {
245 printk(KERN_DEBUG "%s: processing %p\n", __FUNCTION__, of_node);
247 vio_register_device(of_node);
254 __initcall(vio_bus_init);
257 #ifdef CONFIG_PPC_PSERIES
258 /* vio_dev refcount hit 0 */
259 static void __devinit vio_dev_release(struct device *dev)
261 struct vio_dev *viodev = to_vio_dev(dev);
265 /* XXX free TCE table */
266 of_node_put(viodev->archdata);
270 static ssize_t viodev_show_name(struct device *dev, char *buf)
272 struct vio_dev *viodev = to_vio_dev(dev);
273 struct device_node *of_node = viodev->archdata;
275 return sprintf(buf, "%s\n", of_node->name);
277 DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL);
280 * vio_register_device: - Register a new vio device.
281 * @of_node: The OF node for this device.
283 * Creates and initializes a vio_dev structure from the data in
284 * of_node (archdata) and adds it to the list of virtual devices.
285 * Returns a pointer to the created vio_dev or NULL if node has
286 * NULL device_type or compatible fields.
288 struct vio_dev * __devinit vio_register_device(struct device_node *of_node)
290 struct vio_dev *viodev;
291 unsigned int *unit_address;
296 /* we need the 'device_type' property, in order to match with drivers */
297 if ((NULL == of_node->type)) {
299 "%s: node %s missing 'device_type'\n", __FUNCTION__,
300 of_node->name ? of_node->name : "<unknown>");
304 unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
306 printk(KERN_WARNING "%s: node %s missing 'reg'\n", __FUNCTION__,
307 of_node->name ? of_node->name : "<unknown>");
311 /* allocate a vio_dev for this node */
312 viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
316 memset(viodev, 0, sizeof(struct vio_dev));
318 viodev->archdata = (void *)of_node_get(of_node);
319 viodev->unit_address = *unit_address;
320 viodev->iommu_table = vio_build_iommu_table(viodev);
322 viodev->irq = NO_IRQ;
323 irq_p = (unsigned int *)get_property(of_node, "interrupts", 0);
325 int virq = virt_irq_create_mapping(*irq_p);
326 if (virq == NO_IRQ) {
327 printk(KERN_ERR "Unable to allocate interrupt "
328 "number for %s\n", of_node->full_name);
330 viodev->irq = irq_offset_up(virq);
333 /* init generic 'struct device' fields: */
334 viodev->dev.parent = &vio_bus_device->dev;
335 viodev->dev.bus = &vio_bus_type;
336 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", viodev->unit_address);
337 viodev->dev.release = vio_dev_release;
339 /* register with generic device framework */
340 if (device_register(&viodev->dev)) {
341 printk(KERN_ERR "%s: failed to register device %s\n", __FUNCTION__,
343 /* XXX free TCE table */
347 device_create_file(&viodev->dev, &dev_attr_name);
351 EXPORT_SYMBOL(vio_register_device);
353 void __devinit vio_unregister_device(struct vio_dev *viodev)
356 device_unregister(&viodev->dev);
358 EXPORT_SYMBOL(vio_unregister_device);
361 * vio_get_attribute: - get attribute for virtual device
362 * @vdev: The vio device to get property.
363 * @which: The property/attribute to be extracted.
364 * @length: Pointer to length of returned data size (unused if NULL).
366 * Calls prom.c's get_property() to return the value of the
367 * attribute specified by the preprocessor constant @which
369 const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length)
371 return get_property((struct device_node *)vdev->archdata, (char*)which, length);
373 EXPORT_SYMBOL(vio_get_attribute);
375 /* vio_find_name() - internal because only vio.c knows how we formatted the
377 * XXX once vio_bus_type.devices is actually used as a kset in
378 * drivers/base/bus.c, this function should be removed in favor of
379 * "device_find(kobj_name, &vio_bus_type)"
381 static struct vio_dev *vio_find_name(const char *kobj_name)
383 struct kobject *found;
385 found = kset_find_obj(&devices_subsys.kset, kobj_name);
389 return to_vio_dev(container_of(found, struct device, kobj));
393 * vio_find_node - find an already-registered vio_dev
394 * @vnode: device_node of the virtual device we're looking for
396 struct vio_dev *vio_find_node(struct device_node *vnode)
398 uint32_t *unit_address;
399 char kobj_name[BUS_ID_SIZE];
401 /* construct the kobject name from the device node */
402 unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
405 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
407 return vio_find_name(kobj_name);
409 EXPORT_SYMBOL(vio_find_node);
412 * vio_build_iommu_table: - gets the dma information from OF and builds the TCE tree.
413 * @dev: the virtual device.
415 * Returns a pointer to the built tce tree, or NULL if it can't
418 struct iommu_table * vio_build_iommu_table(struct vio_dev *dev)
420 unsigned int *dma_window;
421 struct iommu_table *newTceTable;
422 unsigned long offset;
424 int dma_window_property_size;
426 dma_window = (unsigned int *) get_property((struct device_node *)dev->archdata, "ibm,my-dma-window", &dma_window_property_size);
431 newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
433 /* RPA docs say that #address-cells is always 1 for virtual
434 devices, but some older boxes' OF returns 2. This should
435 be removed by GA, unless there is legacy OFs that still
436 have 2 for #address-cells */
437 size = ((dma_window[1+vio_num_address_cells] >> PAGE_SHIFT) << 3)
440 /* This is just an ugly kludge. Remove as soon as the OF for all
441 machines actually follow the spec and encodes the offset field
442 as phys-encode (that is, #address-cells wide)*/
443 if (dma_window_property_size == 12) {
444 size = ((dma_window[1] >> PAGE_SHIFT) << 3) >> PAGE_SHIFT;
445 } else if (dma_window_property_size == 20) {
446 size = ((dma_window[4] >> PAGE_SHIFT) << 3) >> PAGE_SHIFT;
448 printk(KERN_WARNING "vio_build_iommu_table: Invalid size of ibm,my-dma-window=%i, using 0x80 for size\n", dma_window_property_size);
452 /* There should be some code to extract the phys-encoded offset
453 using prom_n_addr_cells(). However, according to a comment
454 on earlier versions, it's always zero, so we don't bother */
455 offset = dma_window[1] >> PAGE_SHIFT;
457 /* TCE table size - measured in units of pages of tce table */
458 newTceTable->it_size = size;
459 /* offset for VIO should always be 0 */
460 newTceTable->it_offset = offset;
461 newTceTable->it_busno = 0;
462 newTceTable->it_index = (unsigned long)dma_window[0];
463 newTceTable->it_type = TCE_VB;
464 newTceTable->it_entrysize = sizeof(union tce_entry);
466 return iommu_init_table(newTceTable);
469 int vio_enable_interrupts(struct vio_dev *dev)
471 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
472 if (rc != H_Success) {
473 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
477 EXPORT_SYMBOL(vio_enable_interrupts);
479 int vio_disable_interrupts(struct vio_dev *dev)
481 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
482 if (rc != H_Success) {
483 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
487 EXPORT_SYMBOL(vio_disable_interrupts);
490 dma_addr_t vio_map_single(struct vio_dev *dev, void *vaddr,
491 size_t size, enum dma_data_direction direction)
493 return iommu_map_single(dev->iommu_table, vaddr, size, direction);
495 EXPORT_SYMBOL(vio_map_single);
497 void vio_unmap_single(struct vio_dev *dev, dma_addr_t dma_handle,
498 size_t size, enum dma_data_direction direction)
500 iommu_unmap_single(dev->iommu_table, dma_handle, size, direction);
502 EXPORT_SYMBOL(vio_unmap_single);
504 int vio_map_sg(struct vio_dev *vdev, struct scatterlist *sglist, int nelems,
505 enum dma_data_direction direction)
507 return iommu_map_sg(&vdev->dev, vdev->iommu_table, sglist,
510 EXPORT_SYMBOL(vio_map_sg);
512 void vio_unmap_sg(struct vio_dev *vdev, struct scatterlist *sglist, int nelems,
513 enum dma_data_direction direction)
515 iommu_unmap_sg(vdev->iommu_table, sglist, nelems, direction);
517 EXPORT_SYMBOL(vio_unmap_sg);
519 void *vio_alloc_consistent(struct vio_dev *dev, size_t size,
520 dma_addr_t *dma_handle)
522 return iommu_alloc_consistent(dev->iommu_table, size, dma_handle);
524 EXPORT_SYMBOL(vio_alloc_consistent);
526 void vio_free_consistent(struct vio_dev *dev, size_t size,
527 void *vaddr, dma_addr_t dma_handle)
529 iommu_free_consistent(dev->iommu_table, size, vaddr, dma_handle);
531 EXPORT_SYMBOL(vio_free_consistent);
533 static int vio_bus_match(struct device *dev, struct device_driver *drv)
535 const struct vio_dev *vio_dev = to_vio_dev(dev);
536 struct vio_driver *vio_drv = to_vio_driver(drv);
537 const struct vio_device_id *ids = vio_drv->id_table;
538 const struct vio_device_id *found_id;
545 found_id = vio_match_device(ids, vio_dev);
552 struct bus_type vio_bus_type = {
554 .match = vio_bus_match,
557 EXPORT_SYMBOL(vio_bus_type);