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-mapping.h> 44 #include <linux/interrupt.h> 45 #include <linux/of.h> 46 #include <linux/slab.h> 47 #include <linux/stat.h> 48 #include <linux/of_platform.h> 49 #include <asm/ibmebus.h> 50 51 static struct device ibmebus_bus_device = { /* fake "parent" device */ 52 .init_name = "ibmebus", 53 }; 54 55 struct bus_type ibmebus_bus_type; 56 57 /* These devices will automatically be added to the bus during init */ 58 static const struct of_device_id ibmebus_matches[] __initconst = { 59 { .compatible = "IBM,lhca" }, 60 { .compatible = "IBM,lhea" }, 61 {}, 62 }; 63 64 static void *ibmebus_alloc_coherent(struct device *dev, 65 size_t size, 66 dma_addr_t *dma_handle, 67 gfp_t flag, 68 unsigned long attrs) 69 { 70 void *mem; 71 72 mem = kmalloc(size, flag); 73 *dma_handle = (dma_addr_t)mem; 74 75 return mem; 76 } 77 78 static void ibmebus_free_coherent(struct device *dev, 79 size_t size, void *vaddr, 80 dma_addr_t dma_handle, 81 unsigned long attrs) 82 { 83 kfree(vaddr); 84 } 85 86 static dma_addr_t ibmebus_map_page(struct device *dev, 87 struct page *page, 88 unsigned long offset, 89 size_t size, 90 enum dma_data_direction direction, 91 unsigned long attrs) 92 { 93 return (dma_addr_t)(page_address(page) + offset); 94 } 95 96 static void ibmebus_unmap_page(struct device *dev, 97 dma_addr_t dma_addr, 98 size_t size, 99 enum dma_data_direction direction, 100 unsigned long attrs) 101 { 102 return; 103 } 104 105 static int ibmebus_map_sg(struct device *dev, 106 struct scatterlist *sgl, 107 int nents, enum dma_data_direction direction, 108 unsigned long attrs) 109 { 110 struct scatterlist *sg; 111 int i; 112 113 for_each_sg(sgl, sg, nents, i) { 114 sg->dma_address = (dma_addr_t) sg_virt(sg); 115 sg->dma_length = sg->length; 116 } 117 118 return nents; 119 } 120 121 static void ibmebus_unmap_sg(struct device *dev, 122 struct scatterlist *sg, 123 int nents, enum dma_data_direction direction, 124 unsigned long attrs) 125 { 126 return; 127 } 128 129 static int ibmebus_dma_supported(struct device *dev, u64 mask) 130 { 131 return mask == DMA_BIT_MASK(64); 132 } 133 134 static u64 ibmebus_dma_get_required_mask(struct device *dev) 135 { 136 return DMA_BIT_MASK(64); 137 } 138 139 static const struct dma_map_ops ibmebus_dma_ops = { 140 .alloc = ibmebus_alloc_coherent, 141 .free = ibmebus_free_coherent, 142 .map_sg = ibmebus_map_sg, 143 .unmap_sg = ibmebus_unmap_sg, 144 .dma_supported = ibmebus_dma_supported, 145 .get_required_mask = ibmebus_dma_get_required_mask, 146 .map_page = ibmebus_map_page, 147 .unmap_page = ibmebus_unmap_page, 148 }; 149 150 static int ibmebus_match_path(struct device *dev, void *data) 151 { 152 struct device_node *dn = to_platform_device(dev)->dev.of_node; 153 return (of_find_node_by_path(data) == dn); 154 } 155 156 static int ibmebus_match_node(struct device *dev, void *data) 157 { 158 return to_platform_device(dev)->dev.of_node == data; 159 } 160 161 static int ibmebus_create_device(struct device_node *dn) 162 { 163 struct platform_device *dev; 164 int ret; 165 166 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device); 167 if (!dev) 168 return -ENOMEM; 169 170 dev->dev.bus = &ibmebus_bus_type; 171 dev->dev.dma_ops = &ibmebus_dma_ops; 172 173 ret = of_device_add(dev); 174 if (ret) 175 platform_device_put(dev); 176 return ret; 177 } 178 179 static int ibmebus_create_devices(const struct of_device_id *matches) 180 { 181 struct device_node *root, *child; 182 struct device *dev; 183 int ret = 0; 184 185 root = of_find_node_by_path("/"); 186 187 for_each_child_of_node(root, child) { 188 if (!of_match_node(matches, child)) 189 continue; 190 191 dev = bus_find_device(&ibmebus_bus_type, NULL, child, 192 ibmebus_match_node); 193 if (dev) { 194 put_device(dev); 195 continue; 196 } 197 198 ret = ibmebus_create_device(child); 199 if (ret) { 200 printk(KERN_ERR "%s: failed to create device (%i)", 201 __func__, ret); 202 of_node_put(child); 203 break; 204 } 205 } 206 207 of_node_put(root); 208 return ret; 209 } 210 211 int ibmebus_register_driver(struct platform_driver *drv) 212 { 213 /* If the driver uses devices that ibmebus doesn't know, add them */ 214 ibmebus_create_devices(drv->driver.of_match_table); 215 216 drv->driver.bus = &ibmebus_bus_type; 217 return driver_register(&drv->driver); 218 } 219 EXPORT_SYMBOL(ibmebus_register_driver); 220 221 void ibmebus_unregister_driver(struct platform_driver *drv) 222 { 223 driver_unregister(&drv->driver); 224 } 225 EXPORT_SYMBOL(ibmebus_unregister_driver); 226 227 int ibmebus_request_irq(u32 ist, irq_handler_t handler, 228 unsigned long irq_flags, const char *devname, 229 void *dev_id) 230 { 231 unsigned int irq = irq_create_mapping(NULL, ist); 232 233 if (!irq) 234 return -EINVAL; 235 236 return request_irq(irq, handler, irq_flags, devname, dev_id); 237 } 238 EXPORT_SYMBOL(ibmebus_request_irq); 239 240 void ibmebus_free_irq(u32 ist, void *dev_id) 241 { 242 unsigned int irq = irq_find_mapping(NULL, ist); 243 244 free_irq(irq, dev_id); 245 irq_dispose_mapping(irq); 246 } 247 EXPORT_SYMBOL(ibmebus_free_irq); 248 249 static char *ibmebus_chomp(const char *in, size_t count) 250 { 251 char *out = kmalloc(count + 1, GFP_KERNEL); 252 253 if (!out) 254 return NULL; 255 256 memcpy(out, in, count); 257 out[count] = '\0'; 258 if (out[count - 1] == '\n') 259 out[count - 1] = '\0'; 260 261 return out; 262 } 263 264 static ssize_t ibmebus_store_probe(struct bus_type *bus, 265 const char *buf, size_t count) 266 { 267 struct device_node *dn = NULL; 268 struct device *dev; 269 char *path; 270 ssize_t rc = 0; 271 272 path = ibmebus_chomp(buf, count); 273 if (!path) 274 return -ENOMEM; 275 276 dev = bus_find_device(&ibmebus_bus_type, NULL, path, 277 ibmebus_match_path); 278 if (dev) { 279 put_device(dev); 280 printk(KERN_WARNING "%s: %s has already been probed\n", 281 __func__, path); 282 rc = -EEXIST; 283 goto out; 284 } 285 286 if ((dn = of_find_node_by_path(path))) { 287 rc = ibmebus_create_device(dn); 288 of_node_put(dn); 289 } else { 290 printk(KERN_WARNING "%s: no such device node: %s\n", 291 __func__, path); 292 rc = -ENODEV; 293 } 294 295 out: 296 kfree(path); 297 if (rc) 298 return rc; 299 return count; 300 } 301 static BUS_ATTR(probe, 0200, NULL, ibmebus_store_probe); 302 303 static ssize_t ibmebus_store_remove(struct bus_type *bus, 304 const char *buf, size_t count) 305 { 306 struct device *dev; 307 char *path; 308 309 path = ibmebus_chomp(buf, count); 310 if (!path) 311 return -ENOMEM; 312 313 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, 314 ibmebus_match_path))) { 315 of_device_unregister(to_platform_device(dev)); 316 put_device(dev); 317 318 kfree(path); 319 return count; 320 } else { 321 printk(KERN_WARNING "%s: %s not on the bus\n", 322 __func__, path); 323 324 kfree(path); 325 return -ENODEV; 326 } 327 } 328 static BUS_ATTR(remove, 0200, NULL, ibmebus_store_remove); 329 330 static struct attribute *ibmbus_bus_attrs[] = { 331 &bus_attr_probe.attr, 332 &bus_attr_remove.attr, 333 NULL, 334 }; 335 ATTRIBUTE_GROUPS(ibmbus_bus); 336 337 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv) 338 { 339 const struct of_device_id *matches = drv->of_match_table; 340 341 if (!matches) 342 return 0; 343 344 return of_match_device(matches, dev) != NULL; 345 } 346 347 static int ibmebus_bus_device_probe(struct device *dev) 348 { 349 int error = -ENODEV; 350 struct platform_driver *drv; 351 struct platform_device *of_dev; 352 353 drv = to_platform_driver(dev->driver); 354 of_dev = to_platform_device(dev); 355 356 if (!drv->probe) 357 return error; 358 359 of_dev_get(of_dev); 360 361 if (of_driver_match_device(dev, dev->driver)) 362 error = drv->probe(of_dev); 363 if (error) 364 of_dev_put(of_dev); 365 366 return error; 367 } 368 369 static int ibmebus_bus_device_remove(struct device *dev) 370 { 371 struct platform_device *of_dev = to_platform_device(dev); 372 struct platform_driver *drv = to_platform_driver(dev->driver); 373 374 if (dev->driver && drv->remove) 375 drv->remove(of_dev); 376 return 0; 377 } 378 379 static void ibmebus_bus_device_shutdown(struct device *dev) 380 { 381 struct platform_device *of_dev = to_platform_device(dev); 382 struct platform_driver *drv = to_platform_driver(dev->driver); 383 384 if (dev->driver && drv->shutdown) 385 drv->shutdown(of_dev); 386 } 387 388 /* 389 * ibmebus_bus_device_attrs 390 */ 391 static ssize_t devspec_show(struct device *dev, 392 struct device_attribute *attr, char *buf) 393 { 394 struct platform_device *ofdev; 395 396 ofdev = to_platform_device(dev); 397 return sprintf(buf, "%pOF\n", ofdev->dev.of_node); 398 } 399 static DEVICE_ATTR_RO(devspec); 400 401 static ssize_t name_show(struct device *dev, 402 struct device_attribute *attr, char *buf) 403 { 404 struct platform_device *ofdev; 405 406 ofdev = to_platform_device(dev); 407 return sprintf(buf, "%pOFn\n", ofdev->dev.of_node); 408 } 409 static DEVICE_ATTR_RO(name); 410 411 static ssize_t modalias_show(struct device *dev, 412 struct device_attribute *attr, char *buf) 413 { 414 return of_device_modalias(dev, buf, PAGE_SIZE); 415 } 416 static DEVICE_ATTR_RO(modalias); 417 418 static struct attribute *ibmebus_bus_device_attrs[] = { 419 &dev_attr_devspec.attr, 420 &dev_attr_name.attr, 421 &dev_attr_modalias.attr, 422 NULL, 423 }; 424 ATTRIBUTE_GROUPS(ibmebus_bus_device); 425 426 struct bus_type ibmebus_bus_type = { 427 .name = "ibmebus", 428 .uevent = of_device_uevent_modalias, 429 .bus_groups = ibmbus_bus_groups, 430 .match = ibmebus_bus_bus_match, 431 .probe = ibmebus_bus_device_probe, 432 .remove = ibmebus_bus_device_remove, 433 .shutdown = ibmebus_bus_device_shutdown, 434 .dev_groups = ibmebus_bus_device_groups, 435 }; 436 EXPORT_SYMBOL(ibmebus_bus_type); 437 438 static int __init ibmebus_bus_init(void) 439 { 440 int err; 441 442 printk(KERN_INFO "IBM eBus Device Driver\n"); 443 444 err = bus_register(&ibmebus_bus_type); 445 if (err) { 446 printk(KERN_ERR "%s: failed to register IBM eBus.\n", 447 __func__); 448 return err; 449 } 450 451 err = device_register(&ibmebus_bus_device); 452 if (err) { 453 printk(KERN_WARNING "%s: device_register returned %i\n", 454 __func__, err); 455 bus_unregister(&ibmebus_bus_type); 456 457 return err; 458 } 459 460 err = ibmebus_create_devices(ibmebus_matches); 461 if (err) { 462 device_unregister(&ibmebus_bus_device); 463 bus_unregister(&ibmebus_bus_type); 464 return err; 465 } 466 467 return 0; 468 } 469 postcore_initcall(ibmebus_bus_init); 470