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 static struct iommu_table *vio_build_iommu_table(struct vio_dev *);
36 static const struct vio_device_id *vio_match_device(
37 const struct vio_device_id *, const struct vio_dev *);
39 #ifdef CONFIG_PPC_PSERIES
40 static int vio_num_address_cells;
42 static struct vio_dev *vio_bus_device; /* fake "parent" device */
44 #ifdef CONFIG_PPC_ISERIES
45 static struct iommu_table veth_iommu_table;
46 static struct iommu_table vio_iommu_table;
48 static struct vio_dev _veth_dev = {
49 .iommu_table = &veth_iommu_table,
50 .dev.bus = &vio_bus_type
52 static struct vio_dev _vio_dev = {
53 .iommu_table = &vio_iommu_table,
54 .dev.bus = &vio_bus_type
57 struct vio_dev *iSeries_veth_dev = &_veth_dev;
58 struct device *iSeries_vio_dev = &_vio_dev.dev;
60 EXPORT_SYMBOL(iSeries_veth_dev);
61 EXPORT_SYMBOL(iSeries_vio_dev);
64 /* convert from struct device to struct vio_dev and pass to driver.
65 * dev->driver has already been set by generic code because vio_bus_match
67 static int vio_bus_probe(struct device *dev)
69 struct vio_dev *viodev = to_vio_dev(dev);
70 struct vio_driver *viodrv = to_vio_driver(dev->driver);
71 const struct vio_device_id *id;
79 id = vio_match_device(viodrv->id_table, viodev);
81 error = viodrv->probe(viodev, id);
87 /* convert from struct device to struct vio_dev and pass to driver. */
88 static int vio_bus_remove(struct device *dev)
90 struct vio_dev *viodev = to_vio_dev(dev);
91 struct vio_driver *viodrv = to_vio_driver(dev->driver);
96 return viodrv->remove(viodev);
99 /* driver can't remove */
104 * vio_register_driver: - Register a new vio driver
105 * @drv: The vio_driver structure to be registered.
107 int vio_register_driver(struct vio_driver *viodrv)
109 printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
112 /* fill in 'struct driver' fields */
113 viodrv->driver.name = viodrv->name;
114 viodrv->driver.bus = &vio_bus_type;
115 viodrv->driver.probe = vio_bus_probe;
116 viodrv->driver.remove = vio_bus_remove;
118 return driver_register(&viodrv->driver);
120 EXPORT_SYMBOL(vio_register_driver);
123 * vio_unregister_driver - Remove registration of vio driver.
124 * @driver: The vio_driver struct to be removed form registration
126 void vio_unregister_driver(struct vio_driver *viodrv)
128 driver_unregister(&viodrv->driver);
130 EXPORT_SYMBOL(vio_unregister_driver);
133 * vio_match_device: - Tell if a VIO device has a matching VIO device id structure.
134 * @ids: array of VIO device id structures to search in
135 * @dev: the VIO device structure to match against
137 * Used by a driver to check whether a VIO device present in the
138 * system is in its list of supported devices. Returns the matching
139 * vio_device_id structure or NULL if there is no match.
141 static const struct vio_device_id * vio_match_device(const struct vio_device_id *ids,
142 const struct vio_dev *dev)
146 #ifdef CONFIG_PPC_PSERIES
148 if ((strncmp(((struct device_node *)dev->dev.platform_data)->type, ids->type, strlen(ids->type)) == 0) &&
149 device_is_compatible(dev->dev.platform_data, ids->compat))
157 #ifdef CONFIG_PPC_ISERIES
158 void __init iommu_vio_init(void)
160 struct iommu_table *t;
161 struct iommu_table_cb cb;
164 cb.itc_busno = 255; /* Bus 255 is the virtual bus */
165 cb.itc_virtbus = 0xff; /* Ask for virtual bus */
167 cbp = virt_to_abs(&cb);
168 HvCallXm_getTceTableParms(cbp);
170 veth_iommu_table.it_size = cb.itc_size / 2;
171 veth_iommu_table.it_busno = cb.itc_busno;
172 veth_iommu_table.it_offset = cb.itc_offset;
173 veth_iommu_table.it_index = cb.itc_index;
174 veth_iommu_table.it_type = TCE_VB;
175 veth_iommu_table.it_entrysize = sizeof(union tce_entry);
176 veth_iommu_table.it_blocksize = 1;
178 t = iommu_init_table(&veth_iommu_table);
181 printk("Virtual Bus VETH TCE table failed.\n");
183 vio_iommu_table.it_size = cb.itc_size - veth_iommu_table.it_size;
184 vio_iommu_table.it_busno = cb.itc_busno;
185 vio_iommu_table.it_offset = cb.itc_offset +
186 veth_iommu_table.it_size * (PAGE_SIZE/sizeof(union tce_entry));
187 vio_iommu_table.it_index = cb.itc_index;
188 vio_iommu_table.it_type = TCE_VB;
189 vio_iommu_table.it_entrysize = sizeof(union tce_entry);
190 vio_iommu_table.it_blocksize = 1;
192 t = iommu_init_table(&vio_iommu_table);
195 printk("Virtual Bus VIO TCE table failed.\n");
200 * vio_bus_init: - Initialize the virtual IO bus
202 static int __init vio_bus_init(void)
204 #ifdef CONFIG_PPC_PSERIES
205 struct device_node *node_vroot, *of_node;
209 err = bus_register(&vio_bus_type);
211 printk(KERN_ERR "failed to register VIO bus\n");
215 /* the fake parent of all vio devices, just to give us a nice directory */
216 vio_bus_device = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
217 if (!vio_bus_device) {
220 memset(vio_bus_device, 0, sizeof(struct vio_dev));
221 strcpy(vio_bus_device->dev.bus_id, "vio");
223 err = device_register(&vio_bus_device->dev);
225 printk(KERN_WARNING "%s: device_register returned %i\n", __FUNCTION__,
227 kfree(vio_bus_device);
231 #ifdef CONFIG_PPC_PSERIES
232 node_vroot = find_devices("vdevice");
233 if ((node_vroot == NULL) || (node_vroot->child == NULL)) {
234 /* this machine doesn't do virtual IO, and that's ok */
238 vio_num_address_cells = prom_n_addr_cells(node_vroot->child);
241 * Create struct vio_devices for each virtual device in the device tree.
242 * Drivers will associate with them later.
244 for (of_node = node_vroot->child;
246 of_node = of_node->sibling) {
247 printk(KERN_DEBUG "%s: processing %p\n", __FUNCTION__, of_node);
249 vio_register_device(of_node);
256 __initcall(vio_bus_init);
259 #ifdef CONFIG_PPC_PSERIES
260 /* vio_dev refcount hit 0 */
261 static void __devinit vio_dev_release(struct device *dev)
263 struct vio_dev *viodev = to_vio_dev(dev);
267 /* XXX free TCE table */
268 of_node_put(viodev->dev.platform_data);
272 static ssize_t viodev_show_devspec(struct device *dev, char *buf)
274 struct device_node *of_node = dev->platform_data;
276 return sprintf(buf, "%s\n", of_node->full_name);
278 DEVICE_ATTR(devspec, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_devspec, NULL);
280 static ssize_t viodev_show_name(struct device *dev, char *buf)
282 struct device_node *of_node = dev->platform_data;
284 return sprintf(buf, "%s\n", of_node->name);
286 DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL);
289 * vio_register_device: - Register a new vio device.
290 * @of_node: The OF node for this device.
292 * Creates and initializes a vio_dev structure from the data in
293 * of_node (dev.platform_data) and adds it to the list of virtual devices.
294 * Returns a pointer to the created vio_dev or NULL if node has
295 * NULL device_type or compatible fields.
297 struct vio_dev * __devinit vio_register_device(struct device_node *of_node)
299 struct vio_dev *viodev;
300 unsigned int *unit_address;
305 /* we need the 'device_type' property, in order to match with drivers */
306 if ((NULL == of_node->type)) {
308 "%s: node %s missing 'device_type'\n", __FUNCTION__,
309 of_node->name ? of_node->name : "<unknown>");
313 unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
315 printk(KERN_WARNING "%s: node %s missing 'reg'\n", __FUNCTION__,
316 of_node->name ? of_node->name : "<unknown>");
320 /* allocate a vio_dev for this node */
321 viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
325 memset(viodev, 0, sizeof(struct vio_dev));
327 viodev->dev.platform_data = of_node_get(of_node);
328 viodev->unit_address = *unit_address;
329 viodev->iommu_table = vio_build_iommu_table(viodev);
331 viodev->irq = NO_IRQ;
332 irq_p = (unsigned int *)get_property(of_node, "interrupts", 0);
334 int virq = virt_irq_create_mapping(*irq_p);
335 if (virq == NO_IRQ) {
336 printk(KERN_ERR "Unable to allocate interrupt "
337 "number for %s\n", of_node->full_name);
339 viodev->irq = irq_offset_up(virq);
342 /* init generic 'struct device' fields: */
343 viodev->dev.parent = &vio_bus_device->dev;
344 viodev->dev.bus = &vio_bus_type;
345 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", viodev->unit_address);
346 viodev->dev.release = vio_dev_release;
348 /* register with generic device framework */
349 if (device_register(&viodev->dev)) {
350 printk(KERN_ERR "%s: failed to register device %s\n", __FUNCTION__,
352 /* XXX free TCE table */
356 device_create_file(&viodev->dev, &dev_attr_name);
357 device_create_file(&viodev->dev, &dev_attr_devspec);
361 EXPORT_SYMBOL(vio_register_device);
363 void __devinit vio_unregister_device(struct vio_dev *viodev)
366 device_remove_file(&viodev->dev, &dev_attr_devspec);
367 device_remove_file(&viodev->dev, &dev_attr_name);
368 device_unregister(&viodev->dev);
370 EXPORT_SYMBOL(vio_unregister_device);
373 * vio_get_attribute: - get attribute for virtual device
374 * @vdev: The vio device to get property.
375 * @which: The property/attribute to be extracted.
376 * @length: Pointer to length of returned data size (unused if NULL).
378 * Calls prom.c's get_property() to return the value of the
379 * attribute specified by the preprocessor constant @which
381 const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length)
383 return get_property(vdev->dev.platform_data, (char*)which, length);
385 EXPORT_SYMBOL(vio_get_attribute);
387 /* vio_find_name() - internal because only vio.c knows how we formatted the
389 * XXX once vio_bus_type.devices is actually used as a kset in
390 * drivers/base/bus.c, this function should be removed in favor of
391 * "device_find(kobj_name, &vio_bus_type)"
393 static struct vio_dev *vio_find_name(const char *kobj_name)
395 struct kobject *found;
397 found = kset_find_obj(&devices_subsys.kset, kobj_name);
401 return to_vio_dev(container_of(found, struct device, kobj));
405 * vio_find_node - find an already-registered vio_dev
406 * @vnode: device_node of the virtual device we're looking for
408 struct vio_dev *vio_find_node(struct device_node *vnode)
410 uint32_t *unit_address;
411 char kobj_name[BUS_ID_SIZE];
413 /* construct the kobject name from the device node */
414 unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
417 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
419 return vio_find_name(kobj_name);
421 EXPORT_SYMBOL(vio_find_node);
424 * vio_build_iommu_table: - gets the dma information from OF and builds the TCE tree.
425 * @dev: the virtual device.
427 * Returns a pointer to the built tce tree, or NULL if it can't
430 static struct iommu_table * vio_build_iommu_table(struct vio_dev *dev)
432 unsigned int *dma_window;
433 struct iommu_table *newTceTable;
434 unsigned long offset;
436 int dma_window_property_size;
438 dma_window = (unsigned int *) get_property(dev->dev.platform_data, "ibm,my-dma-window", &dma_window_property_size);
443 newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
445 /* RPA docs say that #address-cells is always 1 for virtual
446 devices, but some older boxes' OF returns 2. This should
447 be removed by GA, unless there is legacy OFs that still
448 have 2 for #address-cells */
449 size = ((dma_window[1+vio_num_address_cells] >> PAGE_SHIFT) << 3)
452 /* This is just an ugly kludge. Remove as soon as the OF for all
453 machines actually follow the spec and encodes the offset field
454 as phys-encode (that is, #address-cells wide)*/
455 if (dma_window_property_size == 12) {
456 size = ((dma_window[1] >> PAGE_SHIFT) << 3) >> PAGE_SHIFT;
457 } else if (dma_window_property_size == 20) {
458 size = ((dma_window[4] >> PAGE_SHIFT) << 3) >> PAGE_SHIFT;
460 printk(KERN_WARNING "vio_build_iommu_table: Invalid size of ibm,my-dma-window=%i, using 0x80 for size\n", dma_window_property_size);
464 /* There should be some code to extract the phys-encoded offset
465 using prom_n_addr_cells(). However, according to a comment
466 on earlier versions, it's always zero, so we don't bother */
467 offset = dma_window[1] >> PAGE_SHIFT;
469 /* TCE table size - measured in units of pages of tce table */
470 newTceTable->it_size = size;
471 /* offset for VIO should always be 0 */
472 newTceTable->it_offset = offset;
473 newTceTable->it_busno = 0;
474 newTceTable->it_index = (unsigned long)dma_window[0];
475 newTceTable->it_type = TCE_VB;
476 newTceTable->it_entrysize = sizeof(union tce_entry);
478 return iommu_init_table(newTceTable);
481 int vio_enable_interrupts(struct vio_dev *dev)
483 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
484 if (rc != H_Success) {
485 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
489 EXPORT_SYMBOL(vio_enable_interrupts);
491 int vio_disable_interrupts(struct vio_dev *dev)
493 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
494 if (rc != H_Success) {
495 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
499 EXPORT_SYMBOL(vio_disable_interrupts);
502 dma_addr_t vio_map_single(struct vio_dev *dev, void *vaddr,
503 size_t size, enum dma_data_direction direction)
505 return iommu_map_single(dev->iommu_table, vaddr, size, direction);
507 EXPORT_SYMBOL(vio_map_single);
509 void vio_unmap_single(struct vio_dev *dev, dma_addr_t dma_handle,
510 size_t size, enum dma_data_direction direction)
512 iommu_unmap_single(dev->iommu_table, dma_handle, size, direction);
514 EXPORT_SYMBOL(vio_unmap_single);
516 int vio_map_sg(struct vio_dev *vdev, struct scatterlist *sglist, int nelems,
517 enum dma_data_direction direction)
519 return iommu_map_sg(&vdev->dev, vdev->iommu_table, sglist,
522 EXPORT_SYMBOL(vio_map_sg);
524 void vio_unmap_sg(struct vio_dev *vdev, struct scatterlist *sglist, int nelems,
525 enum dma_data_direction direction)
527 iommu_unmap_sg(vdev->iommu_table, sglist, nelems, direction);
529 EXPORT_SYMBOL(vio_unmap_sg);
531 void *vio_alloc_consistent(struct vio_dev *dev, size_t size,
532 dma_addr_t *dma_handle)
534 return iommu_alloc_consistent(dev->iommu_table, size, dma_handle);
536 EXPORT_SYMBOL(vio_alloc_consistent);
538 void vio_free_consistent(struct vio_dev *dev, size_t size,
539 void *vaddr, dma_addr_t dma_handle)
541 iommu_free_consistent(dev->iommu_table, size, vaddr, dma_handle);
543 EXPORT_SYMBOL(vio_free_consistent);
545 static int vio_bus_match(struct device *dev, struct device_driver *drv)
547 const struct vio_dev *vio_dev = to_vio_dev(dev);
548 struct vio_driver *vio_drv = to_vio_driver(drv);
549 const struct vio_device_id *ids = vio_drv->id_table;
550 const struct vio_device_id *found_id;
557 found_id = vio_match_device(ids, vio_dev);
564 struct bus_type vio_bus_type = {
566 .match = vio_bus_match,
569 EXPORT_SYMBOL(vio_bus_type);