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 (dn->full_name && 154 (strcasecmp((char *)data, dn->full_name) == 0)); 155 } 156 157 static int ibmebus_match_node(struct device *dev, void *data) 158 { 159 return to_platform_device(dev)->dev.of_node == data; 160 } 161 162 static int ibmebus_create_device(struct device_node *dn) 163 { 164 struct platform_device *dev; 165 int ret; 166 167 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device); 168 if (!dev) 169 return -ENOMEM; 170 171 dev->dev.bus = &ibmebus_bus_type; 172 dev->dev.dma_ops = &ibmebus_dma_ops; 173 174 ret = of_device_add(dev); 175 if (ret) 176 platform_device_put(dev); 177 return ret; 178 } 179 180 static int ibmebus_create_devices(const struct of_device_id *matches) 181 { 182 struct device_node *root, *child; 183 struct device *dev; 184 int ret = 0; 185 186 root = of_find_node_by_path("/"); 187 188 for_each_child_of_node(root, child) { 189 if (!of_match_node(matches, child)) 190 continue; 191 192 dev = bus_find_device(&ibmebus_bus_type, NULL, child, 193 ibmebus_match_node); 194 if (dev) { 195 put_device(dev); 196 continue; 197 } 198 199 ret = ibmebus_create_device(child); 200 if (ret) { 201 printk(KERN_ERR "%s: failed to create device (%i)", 202 __func__, ret); 203 of_node_put(child); 204 break; 205 } 206 } 207 208 of_node_put(root); 209 return ret; 210 } 211 212 int ibmebus_register_driver(struct platform_driver *drv) 213 { 214 /* If the driver uses devices that ibmebus doesn't know, add them */ 215 ibmebus_create_devices(drv->driver.of_match_table); 216 217 drv->driver.bus = &ibmebus_bus_type; 218 return driver_register(&drv->driver); 219 } 220 EXPORT_SYMBOL(ibmebus_register_driver); 221 222 void ibmebus_unregister_driver(struct platform_driver *drv) 223 { 224 driver_unregister(&drv->driver); 225 } 226 EXPORT_SYMBOL(ibmebus_unregister_driver); 227 228 int ibmebus_request_irq(u32 ist, irq_handler_t handler, 229 unsigned long irq_flags, const char *devname, 230 void *dev_id) 231 { 232 unsigned int irq = irq_create_mapping(NULL, ist); 233 234 if (!irq) 235 return -EINVAL; 236 237 return request_irq(irq, handler, irq_flags, devname, dev_id); 238 } 239 EXPORT_SYMBOL(ibmebus_request_irq); 240 241 void ibmebus_free_irq(u32 ist, void *dev_id) 242 { 243 unsigned int irq = irq_find_mapping(NULL, ist); 244 245 free_irq(irq, dev_id); 246 irq_dispose_mapping(irq); 247 } 248 EXPORT_SYMBOL(ibmebus_free_irq); 249 250 static char *ibmebus_chomp(const char *in, size_t count) 251 { 252 char *out = kmalloc(count + 1, GFP_KERNEL); 253 254 if (!out) 255 return NULL; 256 257 memcpy(out, in, count); 258 out[count] = '\0'; 259 if (out[count - 1] == '\n') 260 out[count - 1] = '\0'; 261 262 return out; 263 } 264 265 static ssize_t ibmebus_store_probe(struct bus_type *bus, 266 const char *buf, size_t count) 267 { 268 struct device_node *dn = NULL; 269 struct device *dev; 270 char *path; 271 ssize_t rc = 0; 272 273 path = ibmebus_chomp(buf, count); 274 if (!path) 275 return -ENOMEM; 276 277 dev = bus_find_device(&ibmebus_bus_type, NULL, path, 278 ibmebus_match_path); 279 if (dev) { 280 put_device(dev); 281 printk(KERN_WARNING "%s: %s has already been probed\n", 282 __func__, path); 283 rc = -EEXIST; 284 goto out; 285 } 286 287 if ((dn = of_find_node_by_path(path))) { 288 rc = ibmebus_create_device(dn); 289 of_node_put(dn); 290 } else { 291 printk(KERN_WARNING "%s: no such device node: %s\n", 292 __func__, path); 293 rc = -ENODEV; 294 } 295 296 out: 297 kfree(path); 298 if (rc) 299 return rc; 300 return count; 301 } 302 static BUS_ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe); 303 304 static ssize_t ibmebus_store_remove(struct bus_type *bus, 305 const char *buf, size_t count) 306 { 307 struct device *dev; 308 char *path; 309 310 path = ibmebus_chomp(buf, count); 311 if (!path) 312 return -ENOMEM; 313 314 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, 315 ibmebus_match_path))) { 316 of_device_unregister(to_platform_device(dev)); 317 put_device(dev); 318 319 kfree(path); 320 return count; 321 } else { 322 printk(KERN_WARNING "%s: %s not on the bus\n", 323 __func__, path); 324 325 kfree(path); 326 return -ENODEV; 327 } 328 } 329 static BUS_ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove); 330 331 static struct attribute *ibmbus_bus_attrs[] = { 332 &bus_attr_probe.attr, 333 &bus_attr_remove.attr, 334 NULL, 335 }; 336 ATTRIBUTE_GROUPS(ibmbus_bus); 337 338 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv) 339 { 340 const struct of_device_id *matches = drv->of_match_table; 341 342 if (!matches) 343 return 0; 344 345 return of_match_device(matches, dev) != NULL; 346 } 347 348 static int ibmebus_bus_device_probe(struct device *dev) 349 { 350 int error = -ENODEV; 351 struct platform_driver *drv; 352 struct platform_device *of_dev; 353 354 drv = to_platform_driver(dev->driver); 355 of_dev = to_platform_device(dev); 356 357 if (!drv->probe) 358 return error; 359 360 of_dev_get(of_dev); 361 362 if (of_driver_match_device(dev, dev->driver)) 363 error = drv->probe(of_dev); 364 if (error) 365 of_dev_put(of_dev); 366 367 return error; 368 } 369 370 static int ibmebus_bus_device_remove(struct device *dev) 371 { 372 struct platform_device *of_dev = to_platform_device(dev); 373 struct platform_driver *drv = to_platform_driver(dev->driver); 374 375 if (dev->driver && drv->remove) 376 drv->remove(of_dev); 377 return 0; 378 } 379 380 static void ibmebus_bus_device_shutdown(struct device *dev) 381 { 382 struct platform_device *of_dev = to_platform_device(dev); 383 struct platform_driver *drv = to_platform_driver(dev->driver); 384 385 if (dev->driver && drv->shutdown) 386 drv->shutdown(of_dev); 387 } 388 389 /* 390 * ibmebus_bus_device_attrs 391 */ 392 static ssize_t devspec_show(struct device *dev, 393 struct device_attribute *attr, char *buf) 394 { 395 struct platform_device *ofdev; 396 397 ofdev = to_platform_device(dev); 398 return sprintf(buf, "%s\n", ofdev->dev.of_node->full_name); 399 } 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, "%s\n", ofdev->dev.of_node->name); 408 } 409 410 static ssize_t modalias_show(struct device *dev, 411 struct device_attribute *attr, char *buf) 412 { 413 return of_device_modalias(dev, buf, PAGE_SIZE); 414 } 415 416 static struct device_attribute ibmebus_bus_device_attrs[] = { 417 __ATTR_RO(devspec), 418 __ATTR_RO(name), 419 __ATTR_RO(modalias), 420 __ATTR_NULL 421 }; 422 423 struct bus_type ibmebus_bus_type = { 424 .name = "ibmebus", 425 .uevent = of_device_uevent_modalias, 426 .bus_groups = ibmbus_bus_groups, 427 .match = ibmebus_bus_bus_match, 428 .probe = ibmebus_bus_device_probe, 429 .remove = ibmebus_bus_device_remove, 430 .shutdown = ibmebus_bus_device_shutdown, 431 .dev_attrs = ibmebus_bus_device_attrs, 432 }; 433 EXPORT_SYMBOL(ibmebus_bus_type); 434 435 static int __init ibmebus_bus_init(void) 436 { 437 int err; 438 439 printk(KERN_INFO "IBM eBus Device Driver\n"); 440 441 err = bus_register(&ibmebus_bus_type); 442 if (err) { 443 printk(KERN_ERR "%s: failed to register IBM eBus.\n", 444 __func__); 445 return err; 446 } 447 448 err = device_register(&ibmebus_bus_device); 449 if (err) { 450 printk(KERN_WARNING "%s: device_register returned %i\n", 451 __func__, err); 452 bus_unregister(&ibmebus_bus_type); 453 454 return err; 455 } 456 457 err = ibmebus_create_devices(ibmebus_matches); 458 if (err) { 459 device_unregister(&ibmebus_bus_device); 460 bus_unregister(&ibmebus_bus_type); 461 return err; 462 } 463 464 return 0; 465 } 466 postcore_initcall(ibmebus_bus_init); 467