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/HvTypes.h>
30 #include <asm/iSeries/HvCallXm.h>
31 #include <asm/iSeries/HvLpConfig.h>
33 #define DBGENTER() pr_debug("%s entered\n", __FUNCTION__)
35 extern struct subsystem devices_subsys; /* needed for vio_find_name() */
37 static const struct vio_device_id *vio_match_device(
38 const struct vio_device_id *, const struct vio_dev *);
40 #ifdef CONFIG_PPC_PSERIES
41 static struct iommu_table *vio_build_iommu_table(struct vio_dev *);
42 static int vio_num_address_cells;
44 static struct vio_dev *vio_bus_device; /* fake "parent" device */
46 #ifdef CONFIG_PPC_ISERIES
47 static struct vio_dev *__init vio_register_device_iseries(char *type,
50 static struct iommu_table veth_iommu_table;
51 static struct iommu_table vio_iommu_table;
53 static struct vio_dev _vio_dev = {
54 .iommu_table = &vio_iommu_table,
55 .dev.bus = &vio_bus_type
57 struct device *iSeries_vio_dev = &_vio_dev.dev;
58 EXPORT_SYMBOL(iSeries_vio_dev);
60 #define device_is_compatible(a, b) 1
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)
147 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
148 device_is_compatible(dev->dev.platform_data, 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");
197 #ifdef CONFIG_PPC_PSERIES
198 static void probe_bus_pseries(void)
200 struct device_node *node_vroot, *of_node;
202 node_vroot = find_devices("vdevice");
203 if ((node_vroot == NULL) || (node_vroot->child == NULL))
204 /* this machine doesn't do virtual IO, and that's ok */
207 vio_num_address_cells = prom_n_addr_cells(node_vroot->child);
210 * Create struct vio_devices for each virtual device in the device tree.
211 * Drivers will associate with them later.
213 for (of_node = node_vroot->child; of_node != NULL;
214 of_node = of_node->sibling) {
215 printk(KERN_DEBUG "%s: processing %p\n", __FUNCTION__, of_node);
216 vio_register_device_node(of_node);
221 #ifdef CONFIG_PPC_ISERIES
222 static void probe_bus_iseries(void)
224 HvLpIndexMap vlan_map = HvLpConfig_getVirtualLanIndexMap();
225 struct vio_dev *viodev;
228 vlan_map = HvLpConfig_getVirtualLanIndexMap();
229 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
230 if ((vlan_map & (0x8000 >> i)) == 0)
232 viodev = vio_register_device_iseries("vlan", i);
233 /* veth is special and has it own iommu_table */
234 viodev->iommu_table = &veth_iommu_table;
236 for (i = 0; i < HVMAXARCHITECTEDVIRTUALDISKS; i++)
237 vio_register_device_iseries("viodasd", i);
238 for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++)
239 vio_register_device_iseries("viocd", i);
240 for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++)
241 vio_register_device_iseries("viotape", i);
246 * vio_bus_init: - Initialize the virtual IO bus
248 static int __init vio_bus_init(void)
252 err = bus_register(&vio_bus_type);
254 printk(KERN_ERR "failed to register VIO bus\n");
258 /* the fake parent of all vio devices, just to give us a nice directory */
259 vio_bus_device = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
260 if (!vio_bus_device) {
263 memset(vio_bus_device, 0, sizeof(struct vio_dev));
264 strcpy(vio_bus_device->dev.bus_id, "vio");
266 err = device_register(&vio_bus_device->dev);
268 printk(KERN_WARNING "%s: device_register returned %i\n", __FUNCTION__,
270 kfree(vio_bus_device);
274 #ifdef CONFIG_PPC_PSERIES
277 #ifdef CONFIG_PPC_ISERIES
284 __initcall(vio_bus_init);
286 /* vio_dev refcount hit 0 */
287 static void __devinit vio_dev_release(struct device *dev)
291 #ifdef CONFIG_PPC_PSERIES
292 /* XXX free TCE table */
293 of_node_put(dev->platform_data);
295 kfree(to_vio_dev(dev));
298 #ifdef CONFIG_PPC_PSERIES
299 static ssize_t viodev_show_devspec(struct device *dev, char *buf)
301 struct device_node *of_node = dev->platform_data;
303 return sprintf(buf, "%s\n", of_node->full_name);
305 DEVICE_ATTR(devspec, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_devspec, NULL);
308 static ssize_t viodev_show_name(struct device *dev, char *buf)
310 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
312 DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL);
314 static struct vio_dev * __devinit vio_register_device_common(
315 struct vio_dev *viodev, char *name, char *type,
316 uint32_t unit_address, struct iommu_table *iommu_table)
322 viodev->unit_address = unit_address;
323 viodev->iommu_table = iommu_table;
324 /* init generic 'struct device' fields: */
325 viodev->dev.parent = &vio_bus_device->dev;
326 viodev->dev.bus = &vio_bus_type;
327 viodev->dev.release = vio_dev_release;
329 /* register with generic device framework */
330 if (device_register(&viodev->dev)) {
331 printk(KERN_ERR "%s: failed to register device %s\n",
332 __FUNCTION__, viodev->dev.bus_id);
335 device_create_file(&viodev->dev, &dev_attr_name);
340 #ifdef CONFIG_PPC_PSERIES
342 * vio_register_device_node: - Register a new vio device.
343 * @of_node: The OF node for this device.
345 * Creates and initializes a vio_dev structure from the data in
346 * of_node (dev.platform_data) and adds it to the list of virtual devices.
347 * Returns a pointer to the created vio_dev or NULL if node has
348 * NULL device_type or compatible fields.
350 struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
352 struct vio_dev *viodev;
353 unsigned int *unit_address;
358 /* we need the 'device_type' property, in order to match with drivers */
359 if ((NULL == of_node->type)) {
361 "%s: node %s missing 'device_type'\n", __FUNCTION__,
362 of_node->name ? of_node->name : "<unknown>");
366 unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
368 printk(KERN_WARNING "%s: node %s missing 'reg'\n", __FUNCTION__,
369 of_node->name ? of_node->name : "<unknown>");
373 /* allocate a vio_dev for this node */
374 viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
378 memset(viodev, 0, sizeof(struct vio_dev));
380 viodev->dev.platform_data = of_node_get(of_node);
382 viodev->irq = NO_IRQ;
383 irq_p = (unsigned int *)get_property(of_node, "interrupts", NULL);
385 int virq = virt_irq_create_mapping(*irq_p);
386 if (virq == NO_IRQ) {
387 printk(KERN_ERR "Unable to allocate interrupt "
388 "number for %s\n", of_node->full_name);
390 viodev->irq = irq_offset_up(virq);
393 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
395 /* register with generic device framework */
396 if (vio_register_device_common(viodev, of_node->name, of_node->type,
397 *unit_address, vio_build_iommu_table(viodev))
399 /* XXX free TCE table */
403 device_create_file(&viodev->dev, &dev_attr_devspec);
407 EXPORT_SYMBOL(vio_register_device_node);
410 #ifdef CONFIG_PPC_ISERIES
412 * vio_register_device: - Register a new vio device.
413 * @voidev: The device to register.
415 static struct vio_dev *__init vio_register_device_iseries(char *type,
418 struct vio_dev *viodev;
422 /* allocate a vio_dev for this node */
423 viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
426 memset(viodev, 0, sizeof(struct vio_dev));
428 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%s%d", type, unit_num);
430 return vio_register_device_common(viodev, viodev->dev.bus_id, type,
431 unit_num, &vio_iommu_table);
435 void __devinit vio_unregister_device(struct vio_dev *viodev)
438 #ifdef CONFIG_PPC_PSERIES
439 device_remove_file(&viodev->dev, &dev_attr_devspec);
441 device_remove_file(&viodev->dev, &dev_attr_name);
442 device_unregister(&viodev->dev);
444 EXPORT_SYMBOL(vio_unregister_device);
446 #ifdef CONFIG_PPC_PSERIES
448 * vio_get_attribute: - get attribute for virtual device
449 * @vdev: The vio device to get property.
450 * @which: The property/attribute to be extracted.
451 * @length: Pointer to length of returned data size (unused if NULL).
453 * Calls prom.c's get_property() to return the value of the
454 * attribute specified by the preprocessor constant @which
456 const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length)
458 return get_property(vdev->dev.platform_data, (char*)which, length);
460 EXPORT_SYMBOL(vio_get_attribute);
462 /* vio_find_name() - internal because only vio.c knows how we formatted the
464 * XXX once vio_bus_type.devices is actually used as a kset in
465 * drivers/base/bus.c, this function should be removed in favor of
466 * "device_find(kobj_name, &vio_bus_type)"
468 static struct vio_dev *vio_find_name(const char *kobj_name)
470 struct kobject *found;
472 found = kset_find_obj(&devices_subsys.kset, kobj_name);
476 return to_vio_dev(container_of(found, struct device, kobj));
480 * vio_find_node - find an already-registered vio_dev
481 * @vnode: device_node of the virtual device we're looking for
483 struct vio_dev *vio_find_node(struct device_node *vnode)
485 uint32_t *unit_address;
486 char kobj_name[BUS_ID_SIZE];
488 /* construct the kobject name from the device node */
489 unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
492 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
494 return vio_find_name(kobj_name);
496 EXPORT_SYMBOL(vio_find_node);
499 * vio_build_iommu_table: - gets the dma information from OF and builds the TCE tree.
500 * @dev: the virtual device.
502 * Returns a pointer to the built tce tree, or NULL if it can't
505 static struct iommu_table * vio_build_iommu_table(struct vio_dev *dev)
507 unsigned int *dma_window;
508 struct iommu_table *newTceTable;
509 unsigned long offset;
511 int dma_window_property_size;
513 dma_window = (unsigned int *) get_property(dev->dev.platform_data, "ibm,my-dma-window", &dma_window_property_size);
518 newTceTable = (struct iommu_table *) kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
520 /* RPA docs say that #address-cells is always 1 for virtual
521 devices, but some older boxes' OF returns 2. This should
522 be removed by GA, unless there is legacy OFs that still
523 have 2 for #address-cells */
524 size = ((dma_window[1+vio_num_address_cells] >> PAGE_SHIFT) << 3)
527 /* This is just an ugly kludge. Remove as soon as the OF for all
528 machines actually follow the spec and encodes the offset field
529 as phys-encode (that is, #address-cells wide)*/
530 if (dma_window_property_size == 12) {
531 size = ((dma_window[1] >> PAGE_SHIFT) << 3) >> PAGE_SHIFT;
532 } else if (dma_window_property_size == 20) {
533 size = ((dma_window[4] >> PAGE_SHIFT) << 3) >> PAGE_SHIFT;
535 printk(KERN_WARNING "vio_build_iommu_table: Invalid size of ibm,my-dma-window=%i, using 0x80 for size\n", dma_window_property_size);
539 /* There should be some code to extract the phys-encoded offset
540 using prom_n_addr_cells(). However, according to a comment
541 on earlier versions, it's always zero, so we don't bother */
542 offset = dma_window[1] >> PAGE_SHIFT;
544 /* TCE table size - measured in units of pages of tce table */
545 newTceTable->it_size = size;
546 /* offset for VIO should always be 0 */
547 newTceTable->it_offset = offset;
548 newTceTable->it_busno = 0;
549 newTceTable->it_index = (unsigned long)dma_window[0];
550 newTceTable->it_type = TCE_VB;
551 newTceTable->it_entrysize = sizeof(union tce_entry);
553 return iommu_init_table(newTceTable);
556 int vio_enable_interrupts(struct vio_dev *dev)
558 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
559 if (rc != H_Success) {
560 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
564 EXPORT_SYMBOL(vio_enable_interrupts);
566 int vio_disable_interrupts(struct vio_dev *dev)
568 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
569 if (rc != H_Success) {
570 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
574 EXPORT_SYMBOL(vio_disable_interrupts);
577 dma_addr_t vio_map_single(struct vio_dev *dev, void *vaddr,
578 size_t size, enum dma_data_direction direction)
580 return iommu_map_single(dev->iommu_table, vaddr, size, direction);
582 EXPORT_SYMBOL(vio_map_single);
584 void vio_unmap_single(struct vio_dev *dev, dma_addr_t dma_handle,
585 size_t size, enum dma_data_direction direction)
587 iommu_unmap_single(dev->iommu_table, dma_handle, size, direction);
589 EXPORT_SYMBOL(vio_unmap_single);
591 int vio_map_sg(struct vio_dev *vdev, struct scatterlist *sglist, int nelems,
592 enum dma_data_direction direction)
594 return iommu_map_sg(&vdev->dev, vdev->iommu_table, sglist,
597 EXPORT_SYMBOL(vio_map_sg);
599 void vio_unmap_sg(struct vio_dev *vdev, struct scatterlist *sglist, int nelems,
600 enum dma_data_direction direction)
602 iommu_unmap_sg(vdev->iommu_table, sglist, nelems, direction);
604 EXPORT_SYMBOL(vio_unmap_sg);
606 void *vio_alloc_consistent(struct vio_dev *dev, size_t size,
607 dma_addr_t *dma_handle)
609 return iommu_alloc_consistent(dev->iommu_table, size, dma_handle);
611 EXPORT_SYMBOL(vio_alloc_consistent);
613 void vio_free_consistent(struct vio_dev *dev, size_t size,
614 void *vaddr, dma_addr_t dma_handle)
616 iommu_free_consistent(dev->iommu_table, size, vaddr, dma_handle);
618 EXPORT_SYMBOL(vio_free_consistent);
620 static int vio_bus_match(struct device *dev, struct device_driver *drv)
622 const struct vio_dev *vio_dev = to_vio_dev(dev);
623 struct vio_driver *vio_drv = to_vio_driver(drv);
624 const struct vio_device_id *ids = vio_drv->id_table;
625 const struct vio_device_id *found_id;
632 found_id = vio_match_device(ids, vio_dev);
639 struct bus_type vio_bus_type = {
641 .match = vio_bus_match,
644 EXPORT_SYMBOL(vio_bus_type);