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, -1))
64 printk("Virtual Bus VETH TCE table failed.\n");
65 if (!iommu_init_table(&vio_iommu_table, -1))
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, "network") == 0)
75 return &veth_iommu_table;
76 return &vio_iommu_table;
80 const unsigned char *dma_window;
81 struct iommu_table *tbl;
82 unsigned long offset, size;
84 dma_window = get_property(dev->dev.platform_data,
85 "ibm,my-dma-window", NULL);
89 tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
91 of_parse_dma_window(dev->dev.platform_data, dma_window,
92 &tbl->it_index, &offset, &size);
94 /* TCE table size - measured in tce entries */
95 tbl->it_size = size >> IOMMU_PAGE_SHIFT;
96 /* offset for VIO should always be 0 */
97 tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
99 tbl->it_type = TCE_VB;
101 return iommu_init_table(tbl, -1);
106 * vio_match_device: - Tell if a VIO device has a matching
107 * VIO device id structure.
108 * @ids: array of VIO device id structures to search in
109 * @dev: the VIO device structure to match against
111 * Used by a driver to check whether a VIO device present in the
112 * system is in its list of supported devices. Returns the matching
113 * vio_device_id structure or NULL if there is no match.
115 static const struct vio_device_id *vio_match_device(
116 const struct vio_device_id *ids, const struct vio_dev *dev)
118 while (ids->type[0] != '\0') {
119 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
120 device_is_compatible(dev->dev.platform_data, ids->compat))
128 * Convert from struct device to struct vio_dev and pass to driver.
129 * dev->driver has already been set by generic code because vio_bus_match
132 static int vio_bus_probe(struct device *dev)
134 struct vio_dev *viodev = to_vio_dev(dev);
135 struct vio_driver *viodrv = to_vio_driver(dev->driver);
136 const struct vio_device_id *id;
142 id = vio_match_device(viodrv->id_table, viodev);
144 error = viodrv->probe(viodev, id);
149 /* convert from struct device to struct vio_dev and pass to driver. */
150 static int vio_bus_remove(struct device *dev)
152 struct vio_dev *viodev = to_vio_dev(dev);
153 struct vio_driver *viodrv = to_vio_driver(dev->driver);
156 return viodrv->remove(viodev);
158 /* driver can't remove */
162 /* convert from struct device to struct vio_dev and pass to driver. */
163 static void vio_bus_shutdown(struct device *dev)
165 struct vio_dev *viodev = to_vio_dev(dev);
166 struct vio_driver *viodrv = to_vio_driver(dev->driver);
168 if (dev->driver && viodrv->shutdown)
169 viodrv->shutdown(viodev);
173 * vio_register_driver: - Register a new vio driver
174 * @drv: The vio_driver structure to be registered.
176 int vio_register_driver(struct vio_driver *viodrv)
178 printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
179 viodrv->driver.name);
181 /* fill in 'struct driver' fields */
182 viodrv->driver.bus = &vio_bus_type;
184 return driver_register(&viodrv->driver);
186 EXPORT_SYMBOL(vio_register_driver);
189 * vio_unregister_driver - Remove registration of vio driver.
190 * @driver: The vio_driver struct to be removed form registration
192 void vio_unregister_driver(struct vio_driver *viodrv)
194 driver_unregister(&viodrv->driver);
196 EXPORT_SYMBOL(vio_unregister_driver);
198 /* vio_dev refcount hit 0 */
199 static void __devinit vio_dev_release(struct device *dev)
201 if (dev->platform_data) {
202 /* XXX free TCE table */
203 of_node_put(dev->platform_data);
205 kfree(to_vio_dev(dev));
209 * vio_register_device_node: - Register a new vio device.
210 * @of_node: The OF node for this device.
212 * Creates and initializes a vio_dev structure from the data in
213 * of_node (dev.platform_data) and adds it to the list of virtual devices.
214 * Returns a pointer to the created vio_dev or NULL if node has
215 * NULL device_type or compatible fields.
217 struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
219 struct vio_dev *viodev;
220 const unsigned int *unit_address;
222 /* we need the 'device_type' property, in order to match with drivers */
223 if (of_node->type == NULL) {
224 printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
226 of_node->name ? of_node->name : "<unknown>");
230 unit_address = get_property(of_node, "reg", NULL);
231 if (unit_address == NULL) {
232 printk(KERN_WARNING "%s: node %s missing 'reg'\n",
234 of_node->name ? of_node->name : "<unknown>");
238 /* allocate a vio_dev for this node */
239 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
243 viodev->dev.platform_data = of_node_get(of_node);
245 viodev->irq = irq_of_parse_and_map(of_node, 0);
247 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
248 viodev->name = of_node->name;
249 viodev->type = of_node->type;
250 viodev->unit_address = *unit_address;
251 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
252 unit_address = get_property(of_node,
253 "linux,unit_address", NULL);
254 if (unit_address != NULL)
255 viodev->unit_address = *unit_address;
257 viodev->iommu_table = vio_build_iommu_table(viodev);
259 /* init generic 'struct device' fields: */
260 viodev->dev.parent = &vio_bus_device.dev;
261 viodev->dev.bus = &vio_bus_type;
262 viodev->dev.release = vio_dev_release;
264 /* register with generic device framework */
265 if (device_register(&viodev->dev)) {
266 printk(KERN_ERR "%s: failed to register device %s\n",
267 __FUNCTION__, viodev->dev.bus_id);
268 /* XXX free TCE table */
275 EXPORT_SYMBOL(vio_register_device_node);
278 * vio_bus_init: - Initialize the virtual IO bus
280 static int __init vio_bus_init(void)
283 struct device_node *node_vroot;
285 #ifdef CONFIG_PPC_ISERIES
286 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
288 vio_bus_device.iommu_table = &vio_iommu_table;
289 iSeries_vio_dev = &vio_bus_device.dev;
293 err = bus_register(&vio_bus_type);
295 printk(KERN_ERR "failed to register VIO bus\n");
300 * The fake parent of all vio devices, just to give us
303 err = device_register(&vio_bus_device.dev);
305 printk(KERN_WARNING "%s: device_register returned %i\n",
310 node_vroot = find_devices("vdevice");
312 struct device_node *of_node;
315 * Create struct vio_devices for each virtual device in
316 * the device tree. Drivers will associate with them later.
318 for (of_node = node_vroot->child; of_node != NULL;
319 of_node = of_node->sibling) {
320 printk(KERN_DEBUG "%s: processing %p\n",
321 __FUNCTION__, of_node);
322 vio_register_device_node(of_node);
328 __initcall(vio_bus_init);
330 static ssize_t name_show(struct device *dev,
331 struct device_attribute *attr, char *buf)
333 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
336 static ssize_t devspec_show(struct device *dev,
337 struct device_attribute *attr, char *buf)
339 struct device_node *of_node = dev->platform_data;
341 return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
344 static struct device_attribute vio_dev_attrs[] = {
350 void __devinit vio_unregister_device(struct vio_dev *viodev)
352 device_unregister(&viodev->dev);
354 EXPORT_SYMBOL(vio_unregister_device);
356 static dma_addr_t vio_map_single(struct device *dev, void *vaddr,
357 size_t size, enum dma_data_direction direction)
359 return iommu_map_single(to_vio_dev(dev)->iommu_table, vaddr, size,
363 static void vio_unmap_single(struct device *dev, dma_addr_t dma_handle,
364 size_t size, enum dma_data_direction direction)
366 iommu_unmap_single(to_vio_dev(dev)->iommu_table, dma_handle, size,
370 static int vio_map_sg(struct device *dev, struct scatterlist *sglist,
371 int nelems, enum dma_data_direction direction)
373 return iommu_map_sg(dev, to_vio_dev(dev)->iommu_table, sglist,
374 nelems, ~0ul, direction);
377 static void vio_unmap_sg(struct device *dev, struct scatterlist *sglist,
378 int nelems, enum dma_data_direction direction)
380 iommu_unmap_sg(to_vio_dev(dev)->iommu_table, sglist, nelems, direction);
383 static void *vio_alloc_coherent(struct device *dev, size_t size,
384 dma_addr_t *dma_handle, gfp_t flag)
386 return iommu_alloc_coherent(to_vio_dev(dev)->iommu_table, size,
387 dma_handle, ~0ul, flag, -1);
390 static void vio_free_coherent(struct device *dev, size_t size,
391 void *vaddr, dma_addr_t dma_handle)
393 iommu_free_coherent(to_vio_dev(dev)->iommu_table, size, vaddr,
397 static int vio_dma_supported(struct device *dev, u64 mask)
402 struct dma_mapping_ops vio_dma_ops = {
403 .alloc_coherent = vio_alloc_coherent,
404 .free_coherent = vio_free_coherent,
405 .map_single = vio_map_single,
406 .unmap_single = vio_unmap_single,
407 .map_sg = vio_map_sg,
408 .unmap_sg = vio_unmap_sg,
409 .dma_supported = vio_dma_supported,
412 static int vio_bus_match(struct device *dev, struct device_driver *drv)
414 const struct vio_dev *vio_dev = to_vio_dev(dev);
415 struct vio_driver *vio_drv = to_vio_driver(drv);
416 const struct vio_device_id *ids = vio_drv->id_table;
418 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
421 static int vio_hotplug(struct device *dev, char **envp, int num_envp,
422 char *buffer, int buffer_size)
424 const struct vio_dev *vio_dev = to_vio_dev(dev);
425 struct device_node *dn = dev->platform_data;
434 cp = get_property(dn, "compatible", &length);
439 length = scnprintf(buffer, buffer_size, "MODALIAS=vio:T%sS%s",
441 if ((buffer_size - length) <= 0)
447 struct bus_type vio_bus_type = {
449 .dev_attrs = vio_dev_attrs,
450 .uevent = vio_hotplug,
451 .match = vio_bus_match,
452 .probe = vio_bus_probe,
453 .remove = vio_bus_remove,
454 .shutdown = vio_bus_shutdown,
458 * vio_get_attribute: - get attribute for virtual device
459 * @vdev: The vio device to get property.
460 * @which: The property/attribute to be extracted.
461 * @length: Pointer to length of returned data size (unused if NULL).
463 * Calls prom.c's get_property() to return the value of the
464 * attribute specified by @which
466 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
468 return get_property(vdev->dev.platform_data, which, length);
470 EXPORT_SYMBOL(vio_get_attribute);
472 #ifdef CONFIG_PPC_PSERIES
473 /* vio_find_name() - internal because only vio.c knows how we formatted the
475 * XXX once vio_bus_type.devices is actually used as a kset in
476 * drivers/base/bus.c, this function should be removed in favor of
477 * "device_find(kobj_name, &vio_bus_type)"
479 static struct vio_dev *vio_find_name(const char *kobj_name)
481 struct kobject *found;
483 found = kset_find_obj(&devices_subsys.kset, kobj_name);
487 return to_vio_dev(container_of(found, struct device, kobj));
491 * vio_find_node - find an already-registered vio_dev
492 * @vnode: device_node of the virtual device we're looking for
494 struct vio_dev *vio_find_node(struct device_node *vnode)
496 const uint32_t *unit_address;
497 char kobj_name[BUS_ID_SIZE];
499 /* construct the kobject name from the device node */
500 unit_address = get_property(vnode, "reg", NULL);
503 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
505 return vio_find_name(kobj_name);
507 EXPORT_SYMBOL(vio_find_node);
509 int vio_enable_interrupts(struct vio_dev *dev)
511 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
513 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
516 EXPORT_SYMBOL(vio_enable_interrupts);
518 int vio_disable_interrupts(struct vio_dev *dev)
520 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
522 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
525 EXPORT_SYMBOL(vio_disable_interrupts);
526 #endif /* CONFIG_PPC_PSERIES */