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 #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 vio_bus_device = { /* fake "parent" device */
49 .name = vio_bus_device.dev.bus_id,
51 #ifdef CONFIG_PPC_ISERIES
52 .iommu_table = &vio_iommu_table,
55 .dev.bus = &vio_bus_type,
58 #ifdef CONFIG_PPC_ISERIES
59 static struct vio_dev *__init vio_register_device_iseries(char *type,
62 struct device *iSeries_vio_dev = &vio_bus_device.dev;
63 EXPORT_SYMBOL(iSeries_vio_dev);
65 #define device_is_compatible(a, b) 1
69 /* convert from struct device to struct vio_dev and pass to driver.
70 * dev->driver has already been set by generic code because vio_bus_match
72 static int vio_bus_probe(struct device *dev)
74 struct vio_dev *viodev = to_vio_dev(dev);
75 struct vio_driver *viodrv = to_vio_driver(dev->driver);
76 const struct vio_device_id *id;
84 id = vio_match_device(viodrv->id_table, viodev);
86 error = viodrv->probe(viodev, id);
92 /* convert from struct device to struct vio_dev and pass to driver. */
93 static int vio_bus_remove(struct device *dev)
95 struct vio_dev *viodev = to_vio_dev(dev);
96 struct vio_driver *viodrv = to_vio_driver(dev->driver);
100 if (viodrv->remove) {
101 return viodrv->remove(viodev);
104 /* driver can't remove */
109 * vio_register_driver: - Register a new vio driver
110 * @drv: The vio_driver structure to be registered.
112 int vio_register_driver(struct vio_driver *viodrv)
114 printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
117 /* fill in 'struct driver' fields */
118 viodrv->driver.name = viodrv->name;
119 viodrv->driver.bus = &vio_bus_type;
120 viodrv->driver.probe = vio_bus_probe;
121 viodrv->driver.remove = vio_bus_remove;
123 return driver_register(&viodrv->driver);
125 EXPORT_SYMBOL(vio_register_driver);
128 * vio_unregister_driver - Remove registration of vio driver.
129 * @driver: The vio_driver struct to be removed form registration
131 void vio_unregister_driver(struct vio_driver *viodrv)
133 driver_unregister(&viodrv->driver);
135 EXPORT_SYMBOL(vio_unregister_driver);
138 * vio_match_device: - Tell if a VIO device has a matching VIO device id structure.
139 * @ids: array of VIO device id structures to search in
140 * @dev: the VIO device structure to match against
142 * Used by a driver to check whether a VIO device present in the
143 * system is in its list of supported devices. Returns the matching
144 * vio_device_id structure or NULL if there is no match.
146 static const struct vio_device_id * vio_match_device(const struct vio_device_id *ids,
147 const struct vio_dev *dev)
152 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
153 device_is_compatible(dev->dev.platform_data, ids->compat))
160 #ifdef CONFIG_PPC_ISERIES
161 void __init iommu_vio_init(void)
163 struct iommu_table *t;
164 struct iommu_table_cb cb;
166 unsigned long itc_entries;
168 cb.itc_busno = 255; /* Bus 255 is the virtual bus */
169 cb.itc_virtbus = 0xff; /* Ask for virtual bus */
171 cbp = virt_to_abs(&cb);
172 HvCallXm_getTceTableParms(cbp);
174 itc_entries = cb.itc_size * PAGE_SIZE / sizeof(union tce_entry);
175 veth_iommu_table.it_size = itc_entries / 2;
176 veth_iommu_table.it_busno = cb.itc_busno;
177 veth_iommu_table.it_offset = cb.itc_offset;
178 veth_iommu_table.it_index = cb.itc_index;
179 veth_iommu_table.it_type = TCE_VB;
180 veth_iommu_table.it_blocksize = 1;
182 t = iommu_init_table(&veth_iommu_table);
185 printk("Virtual Bus VETH TCE table failed.\n");
187 vio_iommu_table.it_size = itc_entries - veth_iommu_table.it_size;
188 vio_iommu_table.it_busno = cb.itc_busno;
189 vio_iommu_table.it_offset = cb.itc_offset +
190 veth_iommu_table.it_size;
191 vio_iommu_table.it_index = cb.itc_index;
192 vio_iommu_table.it_type = TCE_VB;
193 vio_iommu_table.it_blocksize = 1;
195 t = iommu_init_table(&vio_iommu_table);
198 printk("Virtual Bus VIO TCE table failed.\n");
202 #ifdef CONFIG_PPC_PSERIES
203 static void probe_bus_pseries(void)
205 struct device_node *node_vroot, *of_node;
207 node_vroot = find_devices("vdevice");
208 if ((node_vroot == NULL) || (node_vroot->child == NULL))
209 /* this machine doesn't do virtual IO, and that's ok */
212 vio_num_address_cells = prom_n_addr_cells(node_vroot->child);
215 * Create struct vio_devices for each virtual device in the device tree.
216 * Drivers will associate with them later.
218 for (of_node = node_vroot->child; of_node != NULL;
219 of_node = of_node->sibling) {
220 printk(KERN_DEBUG "%s: processing %p\n", __FUNCTION__, of_node);
221 vio_register_device_node(of_node);
226 #ifdef CONFIG_PPC_ISERIES
227 static void probe_bus_iseries(void)
229 HvLpIndexMap vlan_map = HvLpConfig_getVirtualLanIndexMap();
230 struct vio_dev *viodev;
233 /* there is only one of each of these */
234 vio_register_device_iseries("viocons", 0);
235 vio_register_device_iseries("vscsi", 0);
237 vlan_map = HvLpConfig_getVirtualLanIndexMap();
238 for (i = 0; i < HVMAXARCHITECTEDVIRTUALLANS; i++) {
239 if ((vlan_map & (0x8000 >> i)) == 0)
241 viodev = vio_register_device_iseries("vlan", i);
242 /* veth is special and has it own iommu_table */
243 viodev->iommu_table = &veth_iommu_table;
245 for (i = 0; i < HVMAXARCHITECTEDVIRTUALDISKS; i++)
246 vio_register_device_iseries("viodasd", i);
247 for (i = 0; i < HVMAXARCHITECTEDVIRTUALCDROMS; i++)
248 vio_register_device_iseries("viocd", i);
249 for (i = 0; i < HVMAXARCHITECTEDVIRTUALTAPES; i++)
250 vio_register_device_iseries("viotape", i);
255 * vio_bus_init: - Initialize the virtual IO bus
257 static int __init vio_bus_init(void)
261 err = bus_register(&vio_bus_type);
263 printk(KERN_ERR "failed to register VIO bus\n");
267 /* the fake parent of all vio devices, just to give us a nice directory */
268 err = device_register(&vio_bus_device.dev);
270 printk(KERN_WARNING "%s: device_register returned %i\n", __FUNCTION__,
275 #ifdef CONFIG_PPC_PSERIES
278 #ifdef CONFIG_PPC_ISERIES
285 __initcall(vio_bus_init);
287 /* vio_dev refcount hit 0 */
288 static void __devinit vio_dev_release(struct device *dev)
292 #ifdef CONFIG_PPC_PSERIES
293 /* XXX free TCE table */
294 of_node_put(dev->platform_data);
296 kfree(to_vio_dev(dev));
299 #ifdef CONFIG_PPC_PSERIES
300 static ssize_t viodev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
302 struct device_node *of_node = dev->platform_data;
304 return sprintf(buf, "%s\n", of_node->full_name);
306 DEVICE_ATTR(devspec, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_devspec, NULL);
309 static ssize_t viodev_show_name(struct device *dev, struct device_attribute *attr, char *buf)
311 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
313 DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, viodev_show_name, NULL);
315 static struct vio_dev * __devinit vio_register_device_common(
316 struct vio_dev *viodev, char *name, char *type,
317 uint32_t unit_address, struct iommu_table *iommu_table)
323 viodev->unit_address = unit_address;
324 viodev->iommu_table = iommu_table;
325 /* init generic 'struct device' fields: */
326 viodev->dev.parent = &vio_bus_device.dev;
327 viodev->dev.bus = &vio_bus_type;
328 viodev->dev.release = vio_dev_release;
330 /* register with generic device framework */
331 if (device_register(&viodev->dev)) {
332 printk(KERN_ERR "%s: failed to register device %s\n",
333 __FUNCTION__, viodev->dev.bus_id);
336 device_create_file(&viodev->dev, &dev_attr_name);
341 #ifdef CONFIG_PPC_PSERIES
343 * vio_register_device_node: - Register a new vio device.
344 * @of_node: The OF node for this device.
346 * Creates and initializes a vio_dev structure from the data in
347 * of_node (dev.platform_data) and adds it to the list of virtual devices.
348 * Returns a pointer to the created vio_dev or NULL if node has
349 * NULL device_type or compatible fields.
351 struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
353 struct vio_dev *viodev;
354 unsigned int *unit_address;
359 /* we need the 'device_type' property, in order to match with drivers */
360 if ((NULL == of_node->type)) {
362 "%s: node %s missing 'device_type'\n", __FUNCTION__,
363 of_node->name ? of_node->name : "<unknown>");
367 unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
369 printk(KERN_WARNING "%s: node %s missing 'reg'\n", __FUNCTION__,
370 of_node->name ? of_node->name : "<unknown>");
374 /* allocate a vio_dev for this node */
375 viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
379 memset(viodev, 0, sizeof(struct vio_dev));
381 viodev->dev.platform_data = of_node_get(of_node);
383 viodev->irq = NO_IRQ;
384 irq_p = (unsigned int *)get_property(of_node, "interrupts", NULL);
386 int virq = virt_irq_create_mapping(*irq_p);
387 if (virq == NO_IRQ) {
388 printk(KERN_ERR "Unable to allocate interrupt "
389 "number for %s\n", of_node->full_name);
391 viodev->irq = irq_offset_up(virq);
394 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
396 /* register with generic device framework */
397 if (vio_register_device_common(viodev, of_node->name, of_node->type,
398 *unit_address, vio_build_iommu_table(viodev))
400 /* XXX free TCE table */
404 device_create_file(&viodev->dev, &dev_attr_devspec);
408 EXPORT_SYMBOL(vio_register_device_node);
411 #ifdef CONFIG_PPC_ISERIES
413 * vio_register_device: - Register a new vio device.
414 * @voidev: The device to register.
416 static struct vio_dev *__init vio_register_device_iseries(char *type,
419 struct vio_dev *viodev;
423 /* allocate a vio_dev for this node */
424 viodev = kmalloc(sizeof(struct vio_dev), GFP_KERNEL);
427 memset(viodev, 0, sizeof(struct vio_dev));
429 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%s%d", type, unit_num);
431 return vio_register_device_common(viodev, viodev->dev.bus_id, type,
432 unit_num, &vio_iommu_table);
436 void __devinit vio_unregister_device(struct vio_dev *viodev)
439 #ifdef CONFIG_PPC_PSERIES
440 device_remove_file(&viodev->dev, &dev_attr_devspec);
442 device_remove_file(&viodev->dev, &dev_attr_name);
443 device_unregister(&viodev->dev);
445 EXPORT_SYMBOL(vio_unregister_device);
447 #ifdef CONFIG_PPC_PSERIES
449 * vio_get_attribute: - get attribute for virtual device
450 * @vdev: The vio device to get property.
451 * @which: The property/attribute to be extracted.
452 * @length: Pointer to length of returned data size (unused if NULL).
454 * Calls prom.c's get_property() to return the value of the
455 * attribute specified by the preprocessor constant @which
457 const void * vio_get_attribute(struct vio_dev *vdev, void* which, int* length)
459 return get_property(vdev->dev.platform_data, (char*)which, length);
461 EXPORT_SYMBOL(vio_get_attribute);
463 /* vio_find_name() - internal because only vio.c knows how we formatted the
465 * XXX once vio_bus_type.devices is actually used as a kset in
466 * drivers/base/bus.c, this function should be removed in favor of
467 * "device_find(kobj_name, &vio_bus_type)"
469 static struct vio_dev *vio_find_name(const char *kobj_name)
471 struct kobject *found;
473 found = kset_find_obj(&devices_subsys.kset, kobj_name);
477 return to_vio_dev(container_of(found, struct device, kobj));
481 * vio_find_node - find an already-registered vio_dev
482 * @vnode: device_node of the virtual device we're looking for
484 struct vio_dev *vio_find_node(struct device_node *vnode)
486 uint32_t *unit_address;
487 char kobj_name[BUS_ID_SIZE];
489 /* construct the kobject name from the device node */
490 unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
493 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
495 return vio_find_name(kobj_name);
497 EXPORT_SYMBOL(vio_find_node);
500 * vio_build_iommu_table: - gets the dma information from OF and builds the TCE tree.
501 * @dev: the virtual device.
503 * Returns a pointer to the built tce tree, or NULL if it can't
506 static struct iommu_table * vio_build_iommu_table(struct vio_dev *dev)
508 unsigned int *dma_window;
509 struct iommu_table *newTceTable;
510 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 /* There should be some code to extract the phys-encoded offset
521 using prom_n_addr_cells(). However, according to a comment
522 on earlier versions, it's always zero, so we don't bother */
523 offset = dma_window[1] >> PAGE_SHIFT;
525 /* TCE table size - measured in tce entries */
526 newTceTable->it_size = dma_window[4] >> PAGE_SHIFT;
527 /* offset for VIO should always be 0 */
528 newTceTable->it_offset = offset;
529 newTceTable->it_busno = 0;
530 newTceTable->it_index = (unsigned long)dma_window[0];
531 newTceTable->it_type = TCE_VB;
533 return iommu_init_table(newTceTable);
536 int vio_enable_interrupts(struct vio_dev *dev)
538 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
539 if (rc != H_Success) {
540 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
544 EXPORT_SYMBOL(vio_enable_interrupts);
546 int vio_disable_interrupts(struct vio_dev *dev)
548 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
549 if (rc != H_Success) {
550 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
554 EXPORT_SYMBOL(vio_disable_interrupts);
557 static dma_addr_t vio_map_single(struct device *dev, void *vaddr,
558 size_t size, enum dma_data_direction direction)
560 return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size,
564 static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle,
565 size_t size, enum dma_data_direction direction)
567 iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size,
571 static int vio_map_sg(struct device *dev, struct scatterlist *sglist,
572 int nelems, enum dma_data_direction direction)
574 return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist,
578 static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist,
579 int nelems, enum dma_data_direction direction)
581 iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction);
584 static void *vio_alloc_coherent(struct device *dev, size_t size,
585 dma_addr_t *dma_handle, unsigned int __nocast flag)
587 return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size,
591 static void vio_free_coherent(struct device *dev, size_t size,
592 void *vaddr, dma_addr_t dma_handle)
594 iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr,
598 static int vio_dma_supported(struct device *dev, u64 mask)
603 struct dma_mapping_ops vio_dma_ops = {
604 .alloc_coherent = vio_alloc_coherent,
605 .free_coherent = vio_free_coherent,
606 .map_single = vio_map_single,
607 .unmap_single = vio_unmap_single,
608 .map_sg = vio_map_sg,
609 .unmap_sg = vio_unmap_sg,
610 .dma_supported = vio_dma_supported,
613 static int vio_bus_match(struct device *dev, struct device_driver *drv)
615 const struct vio_dev *vio_dev = to_vio_dev(dev);
616 struct vio_driver *vio_drv = to_vio_driver(drv);
617 const struct vio_device_id *ids = vio_drv->id_table;
618 const struct vio_device_id *found_id;
625 found_id = vio_match_device(ids, vio_dev);
632 struct bus_type vio_bus_type = {
634 .match = vio_bus_match,