1 /* 2 * IBM PowerPC IBM eBus Infrastructure Support. 3 * 4 * Copyright (c) 2005 IBM Corporation 5 * Joachim Fenkes <fenkes@de.ibm.com> 6 * Heiko J Schick <schickhj@de.ibm.com> 7 * 8 * All rights reserved. 9 * 10 * This source code is distributed under a dual license of GPL v2.0 and OpenIB 11 * BSD. 12 * 13 * OpenIB BSD License 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions are met: 17 * 18 * Redistributions of source code must retain the above copyright notice, this 19 * list of conditions and the following disclaimer. 20 * 21 * Redistributions in binary form must reproduce the above copyright notice, 22 * this list of conditions and the following disclaimer in the documentation 23 * and/or other materials 24 * provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 27 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 30 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 33 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 34 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <linux/init.h> 40 #include <linux/export.h> 41 #include <linux/console.h> 42 #include <linux/kobject.h> 43 #include <linux/dma-map-ops.h> 44 #include <linux/interrupt.h> 45 #include <linux/irqdomain.h> 46 #include <linux/of.h> 47 #include <linux/slab.h> 48 #include <linux/stat.h> 49 #include <linux/of_platform.h> 50 #include <linux/platform_device.h> 51 #include <asm/ibmebus.h> 52 #include <asm/machdep.h> 53 54 static struct device ibmebus_bus_device = { /* fake "parent" device */ 55 .init_name = "ibmebus", 56 }; 57 58 struct bus_type ibmebus_bus_type; 59 60 /* These devices will automatically be added to the bus during init */ 61 static const struct of_device_id ibmebus_matches[] __initconst = { 62 { .compatible = "IBM,lhca" }, 63 { .compatible = "IBM,lhea" }, 64 {}, 65 }; 66 67 static void *ibmebus_alloc_coherent(struct device *dev, 68 size_t size, 69 dma_addr_t *dma_handle, 70 gfp_t flag, 71 unsigned long attrs) 72 { 73 void *mem; 74 75 mem = kmalloc(size, flag); 76 *dma_handle = (dma_addr_t)mem; 77 78 return mem; 79 } 80 81 static void ibmebus_free_coherent(struct device *dev, 82 size_t size, void *vaddr, 83 dma_addr_t dma_handle, 84 unsigned long attrs) 85 { 86 kfree(vaddr); 87 } 88 89 static dma_addr_t ibmebus_map_page(struct device *dev, 90 struct page *page, 91 unsigned long offset, 92 size_t size, 93 enum dma_data_direction direction, 94 unsigned long attrs) 95 { 96 return (dma_addr_t)(page_address(page) + offset); 97 } 98 99 static void ibmebus_unmap_page(struct device *dev, 100 dma_addr_t dma_addr, 101 size_t size, 102 enum dma_data_direction direction, 103 unsigned long attrs) 104 { 105 return; 106 } 107 108 static int ibmebus_map_sg(struct device *dev, 109 struct scatterlist *sgl, 110 int nents, enum dma_data_direction direction, 111 unsigned long attrs) 112 { 113 struct scatterlist *sg; 114 int i; 115 116 for_each_sg(sgl, sg, nents, i) { 117 sg->dma_address = (dma_addr_t) sg_virt(sg); 118 sg->dma_length = sg->length; 119 } 120 121 return nents; 122 } 123 124 static void ibmebus_unmap_sg(struct device *dev, 125 struct scatterlist *sg, 126 int nents, enum dma_data_direction direction, 127 unsigned long attrs) 128 { 129 return; 130 } 131 132 static int ibmebus_dma_supported(struct device *dev, u64 mask) 133 { 134 return mask == DMA_BIT_MASK(64); 135 } 136 137 static u64 ibmebus_dma_get_required_mask(struct device *dev) 138 { 139 return DMA_BIT_MASK(64); 140 } 141 142 static const struct dma_map_ops ibmebus_dma_ops = { 143 .alloc = ibmebus_alloc_coherent, 144 .free = ibmebus_free_coherent, 145 .map_sg = ibmebus_map_sg, 146 .unmap_sg = ibmebus_unmap_sg, 147 .dma_supported = ibmebus_dma_supported, 148 .get_required_mask = ibmebus_dma_get_required_mask, 149 .map_page = ibmebus_map_page, 150 .unmap_page = ibmebus_unmap_page, 151 }; 152 153 static int ibmebus_match_path(struct device *dev, const void *data) 154 { 155 struct device_node *dn = to_platform_device(dev)->dev.of_node; 156 struct device_node *tn = of_find_node_by_path(data); 157 158 of_node_put(tn); 159 160 return (tn == dn); 161 } 162 163 static int ibmebus_match_node(struct device *dev, const void *data) 164 { 165 return to_platform_device(dev)->dev.of_node == data; 166 } 167 168 static int ibmebus_create_device(struct device_node *dn) 169 { 170 struct platform_device *dev; 171 int ret; 172 173 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device); 174 if (!dev) 175 return -ENOMEM; 176 177 dev->dev.bus = &ibmebus_bus_type; 178 dev->dev.dma_ops = &ibmebus_dma_ops; 179 180 ret = of_device_add(dev); 181 if (ret) 182 platform_device_put(dev); 183 return ret; 184 } 185 186 static int ibmebus_create_devices(const struct of_device_id *matches) 187 { 188 struct device_node *root, *child; 189 struct device *dev; 190 int ret = 0; 191 192 root = of_find_node_by_path("/"); 193 194 for_each_child_of_node(root, child) { 195 if (!of_match_node(matches, child)) 196 continue; 197 198 dev = bus_find_device(&ibmebus_bus_type, NULL, child, 199 ibmebus_match_node); 200 if (dev) { 201 put_device(dev); 202 continue; 203 } 204 205 ret = ibmebus_create_device(child); 206 if (ret) { 207 printk(KERN_ERR "%s: failed to create device (%i)", 208 __func__, ret); 209 of_node_put(child); 210 break; 211 } 212 } 213 214 of_node_put(root); 215 return ret; 216 } 217 218 int ibmebus_register_driver(struct platform_driver *drv) 219 { 220 /* If the driver uses devices that ibmebus doesn't know, add them */ 221 ibmebus_create_devices(drv->driver.of_match_table); 222 223 drv->driver.bus = &ibmebus_bus_type; 224 return driver_register(&drv->driver); 225 } 226 EXPORT_SYMBOL(ibmebus_register_driver); 227 228 void ibmebus_unregister_driver(struct platform_driver *drv) 229 { 230 driver_unregister(&drv->driver); 231 } 232 EXPORT_SYMBOL(ibmebus_unregister_driver); 233 234 int ibmebus_request_irq(u32 ist, irq_handler_t handler, 235 unsigned long irq_flags, const char *devname, 236 void *dev_id) 237 { 238 unsigned int irq = irq_create_mapping(NULL, ist); 239 240 if (!irq) 241 return -EINVAL; 242 243 return request_irq(irq, handler, irq_flags, devname, dev_id); 244 } 245 EXPORT_SYMBOL(ibmebus_request_irq); 246 247 void ibmebus_free_irq(u32 ist, void *dev_id) 248 { 249 unsigned int irq = irq_find_mapping(NULL, ist); 250 251 free_irq(irq, dev_id); 252 irq_dispose_mapping(irq); 253 } 254 EXPORT_SYMBOL(ibmebus_free_irq); 255 256 static char *ibmebus_chomp(const char *in, size_t count) 257 { 258 char *out = kmalloc(count + 1, GFP_KERNEL); 259 260 if (!out) 261 return NULL; 262 263 memcpy(out, in, count); 264 out[count] = '\0'; 265 if (out[count - 1] == '\n') 266 out[count - 1] = '\0'; 267 268 return out; 269 } 270 271 static ssize_t probe_store(const struct bus_type *bus, const char *buf, size_t count) 272 { 273 struct device_node *dn = NULL; 274 struct device *dev; 275 char *path; 276 ssize_t rc = 0; 277 278 path = ibmebus_chomp(buf, count); 279 if (!path) 280 return -ENOMEM; 281 282 dev = bus_find_device(&ibmebus_bus_type, NULL, path, 283 ibmebus_match_path); 284 if (dev) { 285 put_device(dev); 286 printk(KERN_WARNING "%s: %s has already been probed\n", 287 __func__, path); 288 rc = -EEXIST; 289 goto out; 290 } 291 292 if ((dn = of_find_node_by_path(path))) { 293 rc = ibmebus_create_device(dn); 294 of_node_put(dn); 295 } else { 296 printk(KERN_WARNING "%s: no such device node: %s\n", 297 __func__, path); 298 rc = -ENODEV; 299 } 300 301 out: 302 kfree(path); 303 if (rc) 304 return rc; 305 return count; 306 } 307 static BUS_ATTR_WO(probe); 308 309 static ssize_t remove_store(const struct bus_type *bus, const char *buf, size_t count) 310 { 311 struct device *dev; 312 char *path; 313 314 path = ibmebus_chomp(buf, count); 315 if (!path) 316 return -ENOMEM; 317 318 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, 319 ibmebus_match_path))) { 320 of_device_unregister(to_platform_device(dev)); 321 put_device(dev); 322 323 kfree(path); 324 return count; 325 } else { 326 printk(KERN_WARNING "%s: %s not on the bus\n", 327 __func__, path); 328 329 kfree(path); 330 return -ENODEV; 331 } 332 } 333 static BUS_ATTR_WO(remove); 334 335 static struct attribute *ibmbus_bus_attrs[] = { 336 &bus_attr_probe.attr, 337 &bus_attr_remove.attr, 338 NULL, 339 }; 340 ATTRIBUTE_GROUPS(ibmbus_bus); 341 342 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv) 343 { 344 const struct of_device_id *matches = drv->of_match_table; 345 346 if (!matches) 347 return 0; 348 349 return of_match_device(matches, dev) != NULL; 350 } 351 352 static int ibmebus_bus_device_probe(struct device *dev) 353 { 354 int error = -ENODEV; 355 struct platform_driver *drv; 356 struct platform_device *of_dev; 357 358 drv = to_platform_driver(dev->driver); 359 of_dev = to_platform_device(dev); 360 361 if (!drv->probe) 362 return error; 363 364 get_device(dev); 365 366 if (of_driver_match_device(dev, dev->driver)) 367 error = drv->probe(of_dev); 368 if (error) 369 put_device(dev); 370 371 return error; 372 } 373 374 static void ibmebus_bus_device_remove(struct device *dev) 375 { 376 struct platform_device *of_dev = to_platform_device(dev); 377 struct platform_driver *drv = to_platform_driver(dev->driver); 378 379 if (dev->driver && drv->remove) 380 drv->remove(of_dev); 381 } 382 383 static void ibmebus_bus_device_shutdown(struct device *dev) 384 { 385 struct platform_device *of_dev = to_platform_device(dev); 386 struct platform_driver *drv = to_platform_driver(dev->driver); 387 388 if (dev->driver && drv->shutdown) 389 drv->shutdown(of_dev); 390 } 391 392 /* 393 * ibmebus_bus_device_attrs 394 */ 395 static ssize_t devspec_show(struct device *dev, 396 struct device_attribute *attr, char *buf) 397 { 398 struct platform_device *ofdev; 399 400 ofdev = to_platform_device(dev); 401 return sprintf(buf, "%pOF\n", ofdev->dev.of_node); 402 } 403 static DEVICE_ATTR_RO(devspec); 404 405 static ssize_t name_show(struct device *dev, 406 struct device_attribute *attr, char *buf) 407 { 408 struct platform_device *ofdev; 409 410 ofdev = to_platform_device(dev); 411 return sprintf(buf, "%pOFn\n", ofdev->dev.of_node); 412 } 413 static DEVICE_ATTR_RO(name); 414 415 static ssize_t modalias_show(struct device *dev, 416 struct device_attribute *attr, char *buf) 417 { 418 return of_device_modalias(dev, buf, PAGE_SIZE); 419 } 420 static DEVICE_ATTR_RO(modalias); 421 422 static struct attribute *ibmebus_bus_device_attrs[] = { 423 &dev_attr_devspec.attr, 424 &dev_attr_name.attr, 425 &dev_attr_modalias.attr, 426 NULL, 427 }; 428 ATTRIBUTE_GROUPS(ibmebus_bus_device); 429 430 static int ibmebus_bus_modalias(const struct device *dev, struct kobj_uevent_env *env) 431 { 432 return of_device_uevent_modalias(dev, env); 433 } 434 435 struct bus_type ibmebus_bus_type = { 436 .name = "ibmebus", 437 .uevent = ibmebus_bus_modalias, 438 .bus_groups = ibmbus_bus_groups, 439 .match = ibmebus_bus_bus_match, 440 .probe = ibmebus_bus_device_probe, 441 .remove = ibmebus_bus_device_remove, 442 .shutdown = ibmebus_bus_device_shutdown, 443 .dev_groups = ibmebus_bus_device_groups, 444 }; 445 EXPORT_SYMBOL(ibmebus_bus_type); 446 447 static int __init ibmebus_bus_init(void) 448 { 449 int err; 450 451 printk(KERN_INFO "IBM eBus Device Driver\n"); 452 453 err = bus_register(&ibmebus_bus_type); 454 if (err) { 455 printk(KERN_ERR "%s: failed to register IBM eBus.\n", 456 __func__); 457 return err; 458 } 459 460 err = device_register(&ibmebus_bus_device); 461 if (err) { 462 printk(KERN_WARNING "%s: device_register returned %i\n", 463 __func__, err); 464 put_device(&ibmebus_bus_device); 465 bus_unregister(&ibmebus_bus_type); 466 467 return err; 468 } 469 470 err = ibmebus_create_devices(ibmebus_matches); 471 if (err) { 472 device_unregister(&ibmebus_bus_device); 473 bus_unregister(&ibmebus_bus_type); 474 return err; 475 } 476 477 return 0; 478 } 479 machine_postcore_initcall(pseries, ibmebus_bus_init); 480