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 subsystem devices_subsys; /* needed for vio_find_name() */
42 static struct vio_dev vio_bus_device = { /* fake "parent" device */
43 .name = vio_bus_device.dev.bus_id,
46 .dev.bus = &vio_bus_type,
49 #ifdef CONFIG_PPC_ISERIES
50 struct device *iSeries_vio_dev = &vio_bus_device.dev;
51 EXPORT_SYMBOL(iSeries_vio_dev);
53 static struct iommu_table veth_iommu_table;
54 static struct iommu_table vio_iommu_table;
56 static void __init iommu_vio_init(void)
58 iommu_table_getparms_iSeries(255, 0, 0xff, &veth_iommu_table);
59 veth_iommu_table.it_size /= 2;
60 vio_iommu_table = veth_iommu_table;
61 vio_iommu_table.it_offset += veth_iommu_table.it_size;
63 if (!iommu_init_table(&veth_iommu_table))
64 printk("Virtual Bus VETH TCE table failed.\n");
65 if (!iommu_init_table(&vio_iommu_table))
66 printk("Virtual Bus VIO TCE table failed.\n");
70 static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
72 #ifdef CONFIG_PPC_ISERIES
73 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
74 if (strcmp(dev->type, "vlan") == 0)
75 return &veth_iommu_table;
76 return &vio_iommu_table;
80 unsigned int *dma_window;
81 struct iommu_table *newTceTable;
83 int dma_window_property_size;
85 dma_window = (unsigned int *)get_property(
86 dev->dev.platform_data, "ibm,my-dma-window",
87 &dma_window_property_size);
91 newTceTable = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
94 * There should be some code to extract the phys-encoded
95 * offset using prom_n_addr_cells(). However, according to
96 * a comment on earlier versions, it's always zero, so we
99 offset = dma_window[1] >> PAGE_SHIFT;
101 /* TCE table size - measured in tce entries */
102 newTceTable->it_size = dma_window[4] >> PAGE_SHIFT;
103 /* offset for VIO should always be 0 */
104 newTceTable->it_offset = offset;
105 newTceTable->it_busno = 0;
106 newTceTable->it_index = (unsigned long)dma_window[0];
107 newTceTable->it_type = TCE_VB;
109 return iommu_init_table(newTceTable);
114 * vio_match_device: - Tell if a VIO device has a matching
115 * VIO device id structure.
116 * @ids: array of VIO device id structures to search in
117 * @dev: the VIO device structure to match against
119 * Used by a driver to check whether a VIO device present in the
120 * system is in its list of supported devices. Returns the matching
121 * vio_device_id structure or NULL if there is no match.
123 static const struct vio_device_id *vio_match_device(
124 const struct vio_device_id *ids, const struct vio_dev *dev)
126 while (ids->type[0] != '\0') {
127 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
128 device_is_compatible(dev->dev.platform_data, ids->compat))
136 * Convert from struct device to struct vio_dev and pass to driver.
137 * dev->driver has already been set by generic code because vio_bus_match
140 static int vio_bus_probe(struct device *dev)
142 struct vio_dev *viodev = to_vio_dev(dev);
143 struct vio_driver *viodrv = to_vio_driver(dev->driver);
144 const struct vio_device_id *id;
150 id = vio_match_device(viodrv->id_table, viodev);
152 error = viodrv->probe(viodev, id);
157 /* convert from struct device to struct vio_dev and pass to driver. */
158 static int vio_bus_remove(struct device *dev)
160 struct vio_dev *viodev = to_vio_dev(dev);
161 struct vio_driver *viodrv = to_vio_driver(dev->driver);
164 return viodrv->remove(viodev);
166 /* driver can't remove */
170 /* convert from struct device to struct vio_dev and pass to driver. */
171 static void vio_bus_shutdown(struct device *dev)
173 struct vio_dev *viodev = to_vio_dev(dev);
174 struct vio_driver *viodrv = to_vio_driver(dev->driver);
176 if (dev->driver && viodrv->shutdown)
177 viodrv->shutdown(viodev);
181 * vio_register_driver: - Register a new vio driver
182 * @drv: The vio_driver structure to be registered.
184 int vio_register_driver(struct vio_driver *viodrv)
186 printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
187 viodrv->driver.name);
189 /* fill in 'struct driver' fields */
190 viodrv->driver.bus = &vio_bus_type;
192 return driver_register(&viodrv->driver);
194 EXPORT_SYMBOL(vio_register_driver);
197 * vio_unregister_driver - Remove registration of vio driver.
198 * @driver: The vio_driver struct to be removed form registration
200 void vio_unregister_driver(struct vio_driver *viodrv)
202 driver_unregister(&viodrv->driver);
204 EXPORT_SYMBOL(vio_unregister_driver);
206 /* vio_dev refcount hit 0 */
207 static void __devinit vio_dev_release(struct device *dev)
209 if (dev->platform_data) {
210 /* XXX free TCE table */
211 of_node_put(dev->platform_data);
213 kfree(to_vio_dev(dev));
217 * vio_register_device_node: - Register a new vio device.
218 * @of_node: The OF node for this device.
220 * Creates and initializes a vio_dev structure from the data in
221 * of_node (dev.platform_data) and adds it to the list of virtual devices.
222 * Returns a pointer to the created vio_dev or NULL if node has
223 * NULL device_type or compatible fields.
225 struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
227 struct vio_dev *viodev;
228 unsigned int *unit_address;
231 /* we need the 'device_type' property, in order to match with drivers */
232 if (of_node->type == NULL) {
233 printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
235 of_node->name ? of_node->name : "<unknown>");
239 unit_address = (unsigned int *)get_property(of_node, "reg", NULL);
240 if (unit_address == NULL) {
241 printk(KERN_WARNING "%s: node %s missing 'reg'\n",
243 of_node->name ? of_node->name : "<unknown>");
247 /* allocate a vio_dev for this node */
248 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
252 viodev->dev.platform_data = of_node_get(of_node);
254 viodev->irq = NO_IRQ;
255 irq_p = (unsigned int *)get_property(of_node, "interrupts", NULL);
257 int virq = virt_irq_create_mapping(*irq_p);
258 if (virq == NO_IRQ) {
259 printk(KERN_ERR "Unable to allocate interrupt "
260 "number for %s\n", of_node->full_name);
262 viodev->irq = irq_offset_up(virq);
265 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
266 viodev->name = of_node->name;
267 viodev->type = of_node->type;
268 viodev->unit_address = *unit_address;
269 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
270 unit_address = (unsigned int *)get_property(of_node,
271 "linux,unit_address", NULL);
272 if (unit_address != NULL)
273 viodev->unit_address = *unit_address;
275 viodev->iommu_table = vio_build_iommu_table(viodev);
277 /* init generic 'struct device' fields: */
278 viodev->dev.parent = &vio_bus_device.dev;
279 viodev->dev.bus = &vio_bus_type;
280 viodev->dev.release = vio_dev_release;
282 /* register with generic device framework */
283 if (device_register(&viodev->dev)) {
284 printk(KERN_ERR "%s: failed to register device %s\n",
285 __FUNCTION__, viodev->dev.bus_id);
286 /* XXX free TCE table */
293 EXPORT_SYMBOL(vio_register_device_node);
296 * vio_bus_init: - Initialize the virtual IO bus
298 static int __init vio_bus_init(void)
301 struct device_node *node_vroot;
303 #ifdef CONFIG_PPC_ISERIES
304 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
306 vio_bus_device.iommu_table = &vio_iommu_table;
307 iSeries_vio_dev = &vio_bus_device.dev;
311 err = bus_register(&vio_bus_type);
313 printk(KERN_ERR "failed to register VIO bus\n");
318 * The fake parent of all vio devices, just to give us
321 err = device_register(&vio_bus_device.dev);
323 printk(KERN_WARNING "%s: device_register returned %i\n",
328 node_vroot = find_devices("vdevice");
330 struct device_node *of_node;
333 * Create struct vio_devices for each virtual device in
334 * the device tree. Drivers will associate with them later.
336 for (of_node = node_vroot->child; of_node != NULL;
337 of_node = of_node->sibling) {
338 printk(KERN_DEBUG "%s: processing %p\n",
339 __FUNCTION__, of_node);
340 vio_register_device_node(of_node);
346 __initcall(vio_bus_init);
348 static ssize_t name_show(struct device *dev,
349 struct device_attribute *attr, char *buf)
351 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
354 static ssize_t devspec_show(struct device *dev,
355 struct device_attribute *attr, char *buf)
357 struct device_node *of_node = dev->platform_data;
359 return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
362 static struct device_attribute vio_dev_attrs[] = {
368 void __devinit vio_unregister_device(struct vio_dev *viodev)
370 device_unregister(&viodev->dev);
372 EXPORT_SYMBOL(vio_unregister_device);
374 static dma_addr_t vio_map_single(struct device *dev, void *vaddr,
375 size_t size, enum dma_data_direction direction)
377 return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size,
381 static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle,
382 size_t size, enum dma_data_direction direction)
384 iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size,
388 static int vio_map_sg(struct device *dev, struct scatterlist *sglist,
389 int nelems, enum dma_data_direction direction)
391 return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist,
392 nelems, ~0ul, direction);
395 static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist,
396 int nelems, enum dma_data_direction direction)
398 iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction);
401 static void *vio_alloc_coherent(struct device *dev, size_t size,
402 dma_addr_t *dma_handle, gfp_t flag)
404 return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size,
405 dma_handle, ~0ul, flag);
408 static void vio_free_coherent(struct device *dev, size_t size,
409 void *vaddr, dma_addr_t dma_handle)
411 iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr,
415 static int vio_dma_supported(struct device *dev, u64 mask)
420 struct dma_mapping_ops vio_dma_ops = {
421 .alloc_coherent = vio_alloc_coherent,
422 .free_coherent = vio_free_coherent,
423 .map_single = vio_map_single,
424 .unmap_single = vio_unmap_single,
425 .map_sg = vio_map_sg,
426 .unmap_sg = vio_unmap_sg,
427 .dma_supported = vio_dma_supported,
430 static int vio_bus_match(struct device *dev, struct device_driver *drv)
432 const struct vio_dev *vio_dev = to_vio_dev(dev);
433 struct vio_driver *vio_drv = to_vio_driver(drv);
434 const struct vio_device_id *ids = vio_drv->id_table;
436 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
439 static int vio_hotplug(struct device *dev, char **envp, int num_envp,
440 char *buffer, int buffer_size)
442 const struct vio_dev *vio_dev = to_vio_dev(dev);
443 struct device_node *dn = dev->platform_data;
452 cp = (char *)get_property(dn, "compatible", &length);
457 length = scnprintf(buffer, buffer_size, "MODALIAS=vio:T%sS%s",
459 if ((buffer_size - length) <= 0)
465 struct bus_type vio_bus_type = {
467 .dev_attrs = vio_dev_attrs,
468 .uevent = vio_hotplug,
469 .match = vio_bus_match,
470 .probe = vio_bus_probe,
471 .remove = vio_bus_remove,
472 .shutdown = vio_bus_shutdown,
476 * vio_get_attribute: - get attribute for virtual device
477 * @vdev: The vio device to get property.
478 * @which: The property/attribute to be extracted.
479 * @length: Pointer to length of returned data size (unused if NULL).
481 * Calls prom.c's get_property() to return the value of the
482 * attribute specified by @which
484 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
486 return get_property(vdev->dev.platform_data, which, length);
488 EXPORT_SYMBOL(vio_get_attribute);
490 #ifdef CONFIG_PPC_PSERIES
491 /* vio_find_name() - internal because only vio.c knows how we formatted the
493 * XXX once vio_bus_type.devices is actually used as a kset in
494 * drivers/base/bus.c, this function should be removed in favor of
495 * "device_find(kobj_name, &vio_bus_type)"
497 static struct vio_dev *vio_find_name(const char *kobj_name)
499 struct kobject *found;
501 found = kset_find_obj(&devices_subsys.kset, kobj_name);
505 return to_vio_dev(container_of(found, struct device, kobj));
509 * vio_find_node - find an already-registered vio_dev
510 * @vnode: device_node of the virtual device we're looking for
512 struct vio_dev *vio_find_node(struct device_node *vnode)
514 uint32_t *unit_address;
515 char kobj_name[BUS_ID_SIZE];
517 /* construct the kobject name from the device node */
518 unit_address = (uint32_t *)get_property(vnode, "reg", NULL);
521 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
523 return vio_find_name(kobj_name);
525 EXPORT_SYMBOL(vio_find_node);
527 int vio_enable_interrupts(struct vio_dev *dev)
529 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
531 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
534 EXPORT_SYMBOL(vio_enable_interrupts);
536 int vio_disable_interrupts(struct vio_dev *dev)
538 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
540 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
543 EXPORT_SYMBOL(vio_disable_interrupts);
544 #endif /* CONFIG_PPC_PSERIES */