| 1 | /* |
| 2 | * IBM PowerPC Virtual I/O Infrastructure Support. |
| 3 | * |
| 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> |
| 8 | * Stephen Rothwell |
| 9 | * |
| 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. |
| 14 | */ |
| 15 | |
| 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> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/dma-mapping.h> |
| 23 | #include <linux/kobject.h> |
| 24 | |
| 25 | #include <asm/iommu.h> |
| 26 | #include <asm/dma.h> |
| 27 | #include <asm/vio.h> |
| 28 | #include <asm/prom.h> |
| 29 | #include <asm/firmware.h> |
| 30 | #include <asm/tce.h> |
| 31 | #include <asm/abs_addr.h> |
| 32 | #include <asm/page.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> |
| 39 | |
| 40 | extern struct kset devices_subsys; /* needed for vio_find_name() */ |
| 41 | |
| 42 | static struct bus_type vio_bus_type; |
| 43 | |
| 44 | static struct vio_dev vio_bus_device = { /* fake "parent" device */ |
| 45 | .name = vio_bus_device.dev.bus_id, |
| 46 | .type = "", |
| 47 | .dev.bus_id = "vio", |
| 48 | .dev.bus = &vio_bus_type, |
| 49 | }; |
| 50 | |
| 51 | static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev) |
| 52 | { |
| 53 | const unsigned char *dma_window; |
| 54 | struct iommu_table *tbl; |
| 55 | unsigned long offset, size; |
| 56 | |
| 57 | if (firmware_has_feature(FW_FEATURE_ISERIES)) |
| 58 | return vio_build_iommu_table_iseries(dev); |
| 59 | |
| 60 | dma_window = of_get_property(dev->dev.archdata.of_node, |
| 61 | "ibm,my-dma-window", NULL); |
| 62 | if (!dma_window) |
| 63 | return NULL; |
| 64 | |
| 65 | tbl = kmalloc(sizeof(*tbl), GFP_KERNEL); |
| 66 | |
| 67 | of_parse_dma_window(dev->dev.archdata.of_node, dma_window, |
| 68 | &tbl->it_index, &offset, &size); |
| 69 | |
| 70 | /* TCE table size - measured in tce entries */ |
| 71 | tbl->it_size = size >> IOMMU_PAGE_SHIFT; |
| 72 | /* offset for VIO should always be 0 */ |
| 73 | tbl->it_offset = offset >> IOMMU_PAGE_SHIFT; |
| 74 | tbl->it_busno = 0; |
| 75 | tbl->it_type = TCE_VB; |
| 76 | |
| 77 | return iommu_init_table(tbl, -1); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * vio_match_device: - Tell if a VIO device has a matching |
| 82 | * VIO device id structure. |
| 83 | * @ids: array of VIO device id structures to search in |
| 84 | * @dev: the VIO device structure to match against |
| 85 | * |
| 86 | * Used by a driver to check whether a VIO device present in the |
| 87 | * system is in its list of supported devices. Returns the matching |
| 88 | * vio_device_id structure or NULL if there is no match. |
| 89 | */ |
| 90 | static const struct vio_device_id *vio_match_device( |
| 91 | const struct vio_device_id *ids, const struct vio_dev *dev) |
| 92 | { |
| 93 | while (ids->type[0] != '\0') { |
| 94 | if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) && |
| 95 | of_device_is_compatible(dev->dev.archdata.of_node, |
| 96 | ids->compat)) |
| 97 | return ids; |
| 98 | ids++; |
| 99 | } |
| 100 | return NULL; |
| 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Convert from struct device to struct vio_dev and pass to driver. |
| 105 | * dev->driver has already been set by generic code because vio_bus_match |
| 106 | * succeeded. |
| 107 | */ |
| 108 | static int vio_bus_probe(struct device *dev) |
| 109 | { |
| 110 | struct vio_dev *viodev = to_vio_dev(dev); |
| 111 | struct vio_driver *viodrv = to_vio_driver(dev->driver); |
| 112 | const struct vio_device_id *id; |
| 113 | int error = -ENODEV; |
| 114 | |
| 115 | if (!viodrv->probe) |
| 116 | return error; |
| 117 | |
| 118 | id = vio_match_device(viodrv->id_table, viodev); |
| 119 | if (id) |
| 120 | error = viodrv->probe(viodev, id); |
| 121 | |
| 122 | return error; |
| 123 | } |
| 124 | |
| 125 | /* convert from struct device to struct vio_dev and pass to driver. */ |
| 126 | static int vio_bus_remove(struct device *dev) |
| 127 | { |
| 128 | struct vio_dev *viodev = to_vio_dev(dev); |
| 129 | struct vio_driver *viodrv = to_vio_driver(dev->driver); |
| 130 | |
| 131 | if (viodrv->remove) |
| 132 | return viodrv->remove(viodev); |
| 133 | |
| 134 | /* driver can't remove */ |
| 135 | return 1; |
| 136 | } |
| 137 | |
| 138 | /** |
| 139 | * vio_register_driver: - Register a new vio driver |
| 140 | * @drv: The vio_driver structure to be registered. |
| 141 | */ |
| 142 | int vio_register_driver(struct vio_driver *viodrv) |
| 143 | { |
| 144 | printk(KERN_DEBUG "%s: driver %s registering\n", __FUNCTION__, |
| 145 | viodrv->driver.name); |
| 146 | |
| 147 | /* fill in 'struct driver' fields */ |
| 148 | viodrv->driver.bus = &vio_bus_type; |
| 149 | |
| 150 | return driver_register(&viodrv->driver); |
| 151 | } |
| 152 | EXPORT_SYMBOL(vio_register_driver); |
| 153 | |
| 154 | /** |
| 155 | * vio_unregister_driver - Remove registration of vio driver. |
| 156 | * @driver: The vio_driver struct to be removed form registration |
| 157 | */ |
| 158 | void vio_unregister_driver(struct vio_driver *viodrv) |
| 159 | { |
| 160 | driver_unregister(&viodrv->driver); |
| 161 | } |
| 162 | EXPORT_SYMBOL(vio_unregister_driver); |
| 163 | |
| 164 | /* vio_dev refcount hit 0 */ |
| 165 | static void __devinit vio_dev_release(struct device *dev) |
| 166 | { |
| 167 | /* XXX should free TCE table */ |
| 168 | of_node_put(dev->archdata.of_node); |
| 169 | kfree(to_vio_dev(dev)); |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * vio_register_device_node: - Register a new vio device. |
| 174 | * @of_node: The OF node for this device. |
| 175 | * |
| 176 | * Creates and initializes a vio_dev structure from the data in |
| 177 | * of_node and adds it to the list of virtual devices. |
| 178 | * Returns a pointer to the created vio_dev or NULL if node has |
| 179 | * NULL device_type or compatible fields. |
| 180 | */ |
| 181 | struct vio_dev * __devinit vio_register_device_node(struct device_node *of_node) |
| 182 | { |
| 183 | struct vio_dev *viodev; |
| 184 | const unsigned int *unit_address; |
| 185 | |
| 186 | /* we need the 'device_type' property, in order to match with drivers */ |
| 187 | if (of_node->type == NULL) { |
| 188 | printk(KERN_WARNING "%s: node %s missing 'device_type'\n", |
| 189 | __FUNCTION__, |
| 190 | of_node->name ? of_node->name : "<unknown>"); |
| 191 | return NULL; |
| 192 | } |
| 193 | |
| 194 | unit_address = of_get_property(of_node, "reg", NULL); |
| 195 | if (unit_address == NULL) { |
| 196 | printk(KERN_WARNING "%s: node %s missing 'reg'\n", |
| 197 | __FUNCTION__, |
| 198 | of_node->name ? of_node->name : "<unknown>"); |
| 199 | return NULL; |
| 200 | } |
| 201 | |
| 202 | /* allocate a vio_dev for this node */ |
| 203 | viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL); |
| 204 | if (viodev == NULL) |
| 205 | return NULL; |
| 206 | |
| 207 | viodev->irq = irq_of_parse_and_map(of_node, 0); |
| 208 | |
| 209 | snprintf(viodev->dev.bus_id, BUS_ID_SIZE, "%x", *unit_address); |
| 210 | viodev->name = of_node->name; |
| 211 | viodev->type = of_node->type; |
| 212 | viodev->unit_address = *unit_address; |
| 213 | if (firmware_has_feature(FW_FEATURE_ISERIES)) { |
| 214 | unit_address = of_get_property(of_node, |
| 215 | "linux,unit_address", NULL); |
| 216 | if (unit_address != NULL) |
| 217 | viodev->unit_address = *unit_address; |
| 218 | } |
| 219 | viodev->dev.archdata.of_node = of_node_get(of_node); |
| 220 | viodev->dev.archdata.dma_ops = &dma_iommu_ops; |
| 221 | viodev->dev.archdata.dma_data = vio_build_iommu_table(viodev); |
| 222 | viodev->dev.archdata.numa_node = of_node_to_nid(of_node); |
| 223 | |
| 224 | /* init generic 'struct device' fields: */ |
| 225 | viodev->dev.parent = &vio_bus_device.dev; |
| 226 | viodev->dev.bus = &vio_bus_type; |
| 227 | viodev->dev.release = vio_dev_release; |
| 228 | |
| 229 | /* register with generic device framework */ |
| 230 | if (device_register(&viodev->dev)) { |
| 231 | printk(KERN_ERR "%s: failed to register device %s\n", |
| 232 | __FUNCTION__, viodev->dev.bus_id); |
| 233 | /* XXX free TCE table */ |
| 234 | kfree(viodev); |
| 235 | return NULL; |
| 236 | } |
| 237 | |
| 238 | return viodev; |
| 239 | } |
| 240 | EXPORT_SYMBOL(vio_register_device_node); |
| 241 | |
| 242 | /** |
| 243 | * vio_bus_init: - Initialize the virtual IO bus |
| 244 | */ |
| 245 | static int __init vio_bus_init(void) |
| 246 | { |
| 247 | int err; |
| 248 | struct device_node *node_vroot; |
| 249 | |
| 250 | err = bus_register(&vio_bus_type); |
| 251 | if (err) { |
| 252 | printk(KERN_ERR "failed to register VIO bus\n"); |
| 253 | return err; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * The fake parent of all vio devices, just to give us |
| 258 | * a nice directory |
| 259 | */ |
| 260 | err = device_register(&vio_bus_device.dev); |
| 261 | if (err) { |
| 262 | printk(KERN_WARNING "%s: device_register returned %i\n", |
| 263 | __FUNCTION__, err); |
| 264 | return err; |
| 265 | } |
| 266 | |
| 267 | node_vroot = of_find_node_by_name(NULL, "vdevice"); |
| 268 | if (node_vroot) { |
| 269 | struct device_node *of_node; |
| 270 | |
| 271 | /* |
| 272 | * Create struct vio_devices for each virtual device in |
| 273 | * the device tree. Drivers will associate with them later. |
| 274 | */ |
| 275 | for (of_node = node_vroot->child; of_node != NULL; |
| 276 | of_node = of_node->sibling) |
| 277 | vio_register_device_node(of_node); |
| 278 | of_node_put(node_vroot); |
| 279 | } |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | __initcall(vio_bus_init); |
| 284 | |
| 285 | static ssize_t name_show(struct device *dev, |
| 286 | struct device_attribute *attr, char *buf) |
| 287 | { |
| 288 | return sprintf(buf, "%s\n", to_vio_dev(dev)->name); |
| 289 | } |
| 290 | |
| 291 | static ssize_t devspec_show(struct device *dev, |
| 292 | struct device_attribute *attr, char *buf) |
| 293 | { |
| 294 | struct device_node *of_node = dev->archdata.of_node; |
| 295 | |
| 296 | return sprintf(buf, "%s\n", of_node ? of_node->full_name : "none"); |
| 297 | } |
| 298 | |
| 299 | static struct device_attribute vio_dev_attrs[] = { |
| 300 | __ATTR_RO(name), |
| 301 | __ATTR_RO(devspec), |
| 302 | __ATTR_NULL |
| 303 | }; |
| 304 | |
| 305 | void __devinit vio_unregister_device(struct vio_dev *viodev) |
| 306 | { |
| 307 | device_unregister(&viodev->dev); |
| 308 | } |
| 309 | EXPORT_SYMBOL(vio_unregister_device); |
| 310 | |
| 311 | static int vio_bus_match(struct device *dev, struct device_driver *drv) |
| 312 | { |
| 313 | const struct vio_dev *vio_dev = to_vio_dev(dev); |
| 314 | struct vio_driver *vio_drv = to_vio_driver(drv); |
| 315 | const struct vio_device_id *ids = vio_drv->id_table; |
| 316 | |
| 317 | return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL); |
| 318 | } |
| 319 | |
| 320 | static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env) |
| 321 | { |
| 322 | const struct vio_dev *vio_dev = to_vio_dev(dev); |
| 323 | struct device_node *dn; |
| 324 | const char *cp; |
| 325 | |
| 326 | dn = dev->archdata.of_node; |
| 327 | if (!dn) |
| 328 | return -ENODEV; |
| 329 | cp = of_get_property(dn, "compatible", NULL); |
| 330 | if (!cp) |
| 331 | return -ENODEV; |
| 332 | |
| 333 | add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp); |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | static struct bus_type vio_bus_type = { |
| 338 | .name = "vio", |
| 339 | .dev_attrs = vio_dev_attrs, |
| 340 | .uevent = vio_hotplug, |
| 341 | .match = vio_bus_match, |
| 342 | .probe = vio_bus_probe, |
| 343 | .remove = vio_bus_remove, |
| 344 | }; |
| 345 | |
| 346 | /** |
| 347 | * vio_get_attribute: - get attribute for virtual device |
| 348 | * @vdev: The vio device to get property. |
| 349 | * @which: The property/attribute to be extracted. |
| 350 | * @length: Pointer to length of returned data size (unused if NULL). |
| 351 | * |
| 352 | * Calls prom.c's of_get_property() to return the value of the |
| 353 | * attribute specified by @which |
| 354 | */ |
| 355 | const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length) |
| 356 | { |
| 357 | return of_get_property(vdev->dev.archdata.of_node, which, length); |
| 358 | } |
| 359 | EXPORT_SYMBOL(vio_get_attribute); |
| 360 | |
| 361 | #ifdef CONFIG_PPC_PSERIES |
| 362 | /* vio_find_name() - internal because only vio.c knows how we formatted the |
| 363 | * kobject name |
| 364 | * XXX once vio_bus_type.devices is actually used as a kset in |
| 365 | * drivers/base/bus.c, this function should be removed in favor of |
| 366 | * "device_find(kobj_name, &vio_bus_type)" |
| 367 | */ |
| 368 | static struct vio_dev *vio_find_name(const char *kobj_name) |
| 369 | { |
| 370 | struct kobject *found; |
| 371 | |
| 372 | found = kset_find_obj(&devices_subsys, kobj_name); |
| 373 | if (!found) |
| 374 | return NULL; |
| 375 | |
| 376 | return to_vio_dev(container_of(found, struct device, kobj)); |
| 377 | } |
| 378 | |
| 379 | /** |
| 380 | * vio_find_node - find an already-registered vio_dev |
| 381 | * @vnode: device_node of the virtual device we're looking for |
| 382 | */ |
| 383 | struct vio_dev *vio_find_node(struct device_node *vnode) |
| 384 | { |
| 385 | const uint32_t *unit_address; |
| 386 | char kobj_name[BUS_ID_SIZE]; |
| 387 | |
| 388 | /* construct the kobject name from the device node */ |
| 389 | unit_address = of_get_property(vnode, "reg", NULL); |
| 390 | if (!unit_address) |
| 391 | return NULL; |
| 392 | snprintf(kobj_name, BUS_ID_SIZE, "%x", *unit_address); |
| 393 | |
| 394 | return vio_find_name(kobj_name); |
| 395 | } |
| 396 | EXPORT_SYMBOL(vio_find_node); |
| 397 | |
| 398 | int vio_enable_interrupts(struct vio_dev *dev) |
| 399 | { |
| 400 | int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE); |
| 401 | if (rc != H_SUCCESS) |
| 402 | printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc); |
| 403 | return rc; |
| 404 | } |
| 405 | EXPORT_SYMBOL(vio_enable_interrupts); |
| 406 | |
| 407 | int vio_disable_interrupts(struct vio_dev *dev) |
| 408 | { |
| 409 | int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE); |
| 410 | if (rc != H_SUCCESS) |
| 411 | printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc); |
| 412 | return rc; |
| 413 | } |
| 414 | EXPORT_SYMBOL(vio_disable_interrupts); |
| 415 | #endif /* CONFIG_PPC_PSERIES */ |