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 kset devices_subsys; /* needed for vio_find_name() */
42 static struct bus_type vio_bus_type;
44 static struct vio_dev vio_bus_device = { /* fake "parent" device */
45 .name = vio_bus_device.dev.bus_id,
48 .dev.bus = &vio_bus_type,
51 #ifdef CONFIG_PPC_ISERIES
52 static struct iommu_table veth_iommu_table;
53 struct iommu_table vio_iommu_table;
55 static void __init iommu_vio_init(void)
57 iommu_table_getparms_iSeries(255, 0, 0xff, &veth_iommu_table);
58 veth_iommu_table.it_size /= 2;
59 vio_iommu_table = veth_iommu_table;
60 vio_iommu_table.it_offset += veth_iommu_table.it_size;
62 if (!iommu_init_table(&veth_iommu_table, -1))
63 printk("Virtual Bus VETH TCE table failed.\n");
64 if (!iommu_init_table(&vio_iommu_table, -1))
65 printk("Virtual Bus VIO TCE table failed.\n");
68 static void __init iommu_vio_init(void)
73 static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev)
75 #ifdef CONFIG_PPC_ISERIES
76 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
77 if (strcmp(dev->type, "network") == 0)
78 return &veth_iommu_table;
79 return &vio_iommu_table;
83 const unsigned char *dma_window;
84 struct iommu_table *tbl;
85 unsigned long offset, size;
87 dma_window = of_get_property(dev->dev.archdata.of_node,
88 "ibm,my-dma-window", NULL);
92 tbl = kmalloc(sizeof(*tbl), GFP_KERNEL);
94 of_parse_dma_window(dev->dev.archdata.of_node, dma_window,
95 &tbl->it_index, &offset, &size);
97 /* TCE table size - measured in tce entries */
98 tbl->it_size = size >> IOMMU_PAGE_SHIFT;
99 /* offset for VIO should always be 0 */
100 tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
102 tbl->it_type = TCE_VB;
104 return iommu_init_table(tbl, -1);
109 * vio_match_device: - Tell if a VIO device has a matching
110 * VIO device id structure.
111 * @ids: array of VIO device id structures to search in
112 * @dev: the VIO device structure to match against
114 * Used by a driver to check whether a VIO device present in the
115 * system is in its list of supported devices. Returns the matching
116 * vio_device_id structure or NULL if there is no match.
118 static const struct vio_device_id *vio_match_device(
119 const struct vio_device_id *ids, const struct vio_dev *dev)
121 while (ids->type[0] != '\0') {
122 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) &&
123 of_device_is_compatible(dev->dev.archdata.of_node,
132 * Convert from struct device to struct vio_dev and pass to driver.
133 * dev->driver has already been set by generic code because vio_bus_match
136 static int vio_bus_probe(struct device *dev)
138 struct vio_dev *viodev = to_vio_dev(dev);
139 struct vio_driver *viodrv = to_vio_driver(dev->driver);
140 const struct vio_device_id *id;
146 id = vio_match_device(viodrv->id_table, viodev);
148 error = viodrv->probe(viodev, id);
153 /* convert from struct device to struct vio_dev and pass to driver. */
154 static int vio_bus_remove(struct device *dev)
156 struct vio_dev *viodev = to_vio_dev(dev);
157 struct vio_driver *viodrv = to_vio_driver(dev->driver);
160 return viodrv->remove(viodev);
162 /* driver can't remove */
167 * vio_register_driver: - Register a new vio driver
168 * @drv: The vio_driver structure to be registered.
170 int vio_register_driver(struct vio_driver *viodrv)
172 printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__,
173 viodrv->driver.name);
175 /* fill in 'struct driver' fields */
176 viodrv->driver.bus = &vio_bus_type;
178 return driver_register(&viodrv->driver);
180 EXPORT_SYMBOL(vio_register_driver);
183 * vio_unregister_driver - Remove registration of vio driver.
184 * @driver: The vio_driver struct to be removed form registration
186 void vio_unregister_driver(struct vio_driver *viodrv)
188 driver_unregister(&viodrv->driver);
190 EXPORT_SYMBOL(vio_unregister_driver);
192 /* vio_dev refcount hit 0 */
193 static void __devinit vio_dev_release(struct device *dev)
195 /* XXX should free TCE table */
196 of_node_put(dev->archdata.of_node);
197 kfree(to_vio_dev(dev));
201 * vio_register_device_node: - Register a new vio device.
202 * @of_node: The OF node for this device.
204 * Creates and initializes a vio_dev structure from the data in
205 * of_node and adds it to the list of virtual devices.
206 * Returns a pointer to the created vio_dev or NULL if node has
207 * NULL device_type or compatible fields.
209 struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node)
211 struct vio_dev *viodev;
212 const unsigned int *unit_address;
214 /* we need the 'device_type' property, in order to match with drivers */
215 if (of_node->type == NULL) {
216 printk(KERN_WARNING "%s: node %s missing 'device_type'\n",
218 of_node->name ? of_node->name : "<unknown>");
222 unit_address = of_get_property(of_node, "reg", NULL);
223 if (unit_address == NULL) {
224 printk(KERN_WARNING "%s: node %s missing 'reg'\n",
226 of_node->name ? of_node->name : "<unknown>");
230 /* allocate a vio_dev for this node */
231 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL);
235 viodev->irq = irq_of_parse_and_map(of_node, 0);
237 snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address);
238 viodev->name = of_node->name;
239 viodev->type = of_node->type;
240 viodev->unit_address = *unit_address;
241 if (firmware_has_feature(FW_FEATURE_ISERIES)) {
242 unit_address = of_get_property(of_node,
243 "linux,unit_address", NULL);
244 if (unit_address != NULL)
245 viodev->unit_address = *unit_address;
247 viodev->dev.archdata.of_node = of_node_get(of_node);
248 viodev->dev.archdata.dma_ops = &dma_iommu_ops;
249 viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev);
250 viodev->dev.archdata.numa_node = of_node_to_nid(of_node);
252 /* init generic 'struct device' fields: */
253 viodev->dev.parent = &vio_bus_device.dev;
254 viodev->dev.bus = &vio_bus_type;
255 viodev->dev.release = vio_dev_release;
257 /* register with generic device framework */
258 if (device_register(&viodev->dev)) {
259 printk(KERN_ERR "%s: failed to register device %s\n",
260 __FUNCTION__, viodev->dev.bus_id);
261 /* XXX free TCE table */
268 EXPORT_SYMBOL(vio_register_device_node);
271 * vio_bus_init: - Initialize the virtual IO bus
273 static int __init vio_bus_init(void)
276 struct device_node *node_vroot;
278 if (firmware_has_feature(FW_FEATURE_ISERIES))
281 err = bus_register(&vio_bus_type);
283 printk(KERN_ERR "failed to register VIO bus\n");
288 * The fake parent of all vio devices, just to give us
291 err = device_register(&vio_bus_device.dev);
293 printk(KERN_WARNING "%s: device_register returned %i\n",
298 node_vroot = of_find_node_by_name(NULL, "vdevice");
300 struct device_node *of_node;
303 * Create struct vio_devices for each virtual device in
304 * the device tree. Drivers will associate with them later.
306 for (of_node = node_vroot->child; of_node != NULL;
307 of_node = of_node->sibling)
308 vio_register_device_node(of_node);
309 of_node_put(node_vroot);
314 __initcall(vio_bus_init);
316 static ssize_t name_show(struct device *dev,
317 struct device_attribute *attr, char *buf)
319 return sprintf(buf, "%s\n", to_vio_dev(dev)->name);
322 static ssize_t devspec_show(struct device *dev,
323 struct device_attribute *attr, char *buf)
325 struct device_node *of_node = dev->archdata.of_node;
327 return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none");
330 static struct device_attribute vio_dev_attrs[] = {
336 void __devinit vio_unregister_device(struct vio_dev *viodev)
338 device_unregister(&viodev->dev);
340 EXPORT_SYMBOL(vio_unregister_device);
342 static int vio_bus_match(struct device *dev, struct device_driver *drv)
344 const struct vio_dev *vio_dev = to_vio_dev(dev);
345 struct vio_driver *vio_drv = to_vio_driver(drv);
346 const struct vio_device_id *ids = vio_drv->id_table;
348 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL);
351 static int vio_hotplug(struct device *dev, char **envp, int num_envp,
352 char *buffer, int buffer_size)
354 const struct vio_dev *vio_dev = to_vio_dev(dev);
355 struct device_node *dn;
362 dn = dev->archdata.of_node;
365 cp = of_get_property(dn, "compatible", &length);
370 length = scnprintf(buffer, buffer_size, "MODALIAS=vio:T%sS%s",
372 if ((buffer_size - length) <= 0)
378 static struct bus_type vio_bus_type = {
380 .dev_attrs = vio_dev_attrs,
381 .uevent = vio_hotplug,
382 .match = vio_bus_match,
383 .probe = vio_bus_probe,
384 .remove = vio_bus_remove,
388 * vio_get_attribute: - get attribute for virtual device
389 * @vdev: The vio device to get property.
390 * @which: The property/attribute to be extracted.
391 * @length: Pointer to length of returned data size (unused if NULL).
393 * Calls prom.c's of_get_property() to return the value of the
394 * attribute specified by @which
396 const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length)
398 return of_get_property(vdev->dev.archdata.of_node, which, length);
400 EXPORT_SYMBOL(vio_get_attribute);
402 #ifdef CONFIG_PPC_PSERIES
403 /* vio_find_name() - internal because only vio.c knows how we formatted the
405 * XXX once vio_bus_type.devices is actually used as a kset in
406 * drivers/base/bus.c, this function should be removed in favor of
407 * "device_find(kobj_name, &vio_bus_type)"
409 static struct vio_dev *vio_find_name(const char *kobj_name)
411 struct kobject *found;
413 found = kset_find_obj(&devices_subsys, kobj_name);
417 return to_vio_dev(container_of(found, struct device, kobj));
421 * vio_find_node - find an already-registered vio_dev
422 * @vnode: device_node of the virtual device we're looking for
424 struct vio_dev *vio_find_node(struct device_node *vnode)
426 const uint32_t *unit_address;
427 char kobj_name[BUS_ID_SIZE];
429 /* construct the kobject name from the device node */
430 unit_address = of_get_property(vnode, "reg", NULL);
433 snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address);
435 return vio_find_name(kobj_name);
437 EXPORT_SYMBOL(vio_find_node);
439 int vio_enable_interrupts(struct vio_dev *dev)
441 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE);
443 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc);
446 EXPORT_SYMBOL(vio_enable_interrupts);
448 int vio_disable_interrupts(struct vio_dev *dev)
450 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE);
452 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc);
455 EXPORT_SYMBOL(vio_disable_interrupts);
456 #endif /* CONFIG_PPC_PSERIES */