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/of.h> 46 #include <linux/slab.h> 47 #include <linux/stat.h> 48 #include <linux/of_platform.h> 49 #include <asm/ibmebus.h> 50 #include <asm/machdep.h> 51 52 static struct device ibmebus_bus_device = { /* fake "parent" device */ 53 .init_name = "ibmebus", 54 }; 55 56 struct bus_type ibmebus_bus_type; 57 58 /* These devices will automatically be added to the bus during init */ 59 static const struct of_device_id ibmebus_matches[] __initconst = { 60 { .compatible = "IBM,lhca" }, 61 { .compatible = "IBM,lhea" }, 62 {}, 63 }; 64 65 static void *ibmebus_alloc_coherent(struct device *dev, 66 size_t size, 67 dma_addr_t *dma_handle, 68 gfp_t flag, 69 unsigned long attrs) 70 { 71 void *mem; 72 73 mem = kmalloc(size, flag); 74 *dma_handle = (dma_addr_t)mem; 75 76 return mem; 77 } 78 79 static void ibmebus_free_coherent(struct device *dev, 80 size_t size, void *vaddr, 81 dma_addr_t dma_handle, 82 unsigned long attrs) 83 { 84 kfree(vaddr); 85 } 86 87 static dma_addr_t ibmebus_map_page(struct device *dev, 88 struct page *page, 89 unsigned long offset, 90 size_t size, 91 enum dma_data_direction direction, 92 unsigned long attrs) 93 { 94 return (dma_addr_t)(page_address(page) + offset); 95 } 96 97 static void ibmebus_unmap_page(struct device *dev, 98 dma_addr_t dma_addr, 99 size_t size, 100 enum dma_data_direction direction, 101 unsigned long attrs) 102 { 103 return; 104 } 105 106 static int ibmebus_map_sg(struct device *dev, 107 struct scatterlist *sgl, 108 int nents, enum dma_data_direction direction, 109 unsigned long attrs) 110 { 111 struct scatterlist *sg; 112 int i; 113 114 for_each_sg(sgl, sg, nents, i) { 115 sg->dma_address = (dma_addr_t) sg_virt(sg); 116 sg->dma_length = sg->length; 117 } 118 119 return nents; 120 } 121 122 static void ibmebus_unmap_sg(struct device *dev, 123 struct scatterlist *sg, 124 int nents, enum dma_data_direction direction, 125 unsigned long attrs) 126 { 127 return; 128 } 129 130 static int ibmebus_dma_supported(struct device *dev, u64 mask) 131 { 132 return mask == DMA_BIT_MASK(64); 133 } 134 135 static u64 ibmebus_dma_get_required_mask(struct device *dev) 136 { 137 return DMA_BIT_MASK(64); 138 } 139 140 static const struct dma_map_ops ibmebus_dma_ops = { 141 .alloc = ibmebus_alloc_coherent, 142 .free = ibmebus_free_coherent, 143 .map_sg = ibmebus_map_sg, 144 .unmap_sg = ibmebus_unmap_sg, 145 .dma_supported = ibmebus_dma_supported, 146 .get_required_mask = ibmebus_dma_get_required_mask, 147 .map_page = ibmebus_map_page, 148 .unmap_page = ibmebus_unmap_page, 149 }; 150 151 static int ibmebus_match_path(struct device *dev, const void *data) 152 { 153 struct device_node *dn = to_platform_device(dev)->dev.of_node; 154 return (of_find_node_by_path(data) == dn); 155 } 156 157 static int ibmebus_match_node(struct device *dev, const 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 probe_store(struct bus_type *bus, 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_WO(probe); 302 303 static ssize_t remove_store(struct bus_type *bus, const char *buf, size_t count) 304 { 305 struct device *dev; 306 char *path; 307 308 path = ibmebus_chomp(buf, count); 309 if (!path) 310 return -ENOMEM; 311 312 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, 313 ibmebus_match_path))) { 314 of_device_unregister(to_platform_device(dev)); 315 put_device(dev); 316 317 kfree(path); 318 return count; 319 } else { 320 printk(KERN_WARNING "%s: %s not on the bus\n", 321 __func__, path); 322 323 kfree(path); 324 return -ENODEV; 325 } 326 } 327 static BUS_ATTR_WO(remove); 328 329 static struct attribute *ibmbus_bus_attrs[] = { 330 &bus_attr_probe.attr, 331 &bus_attr_remove.attr, 332 NULL, 333 }; 334 ATTRIBUTE_GROUPS(ibmbus_bus); 335 336 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv) 337 { 338 const struct of_device_id *matches = drv->of_match_table; 339 340 if (!matches) 341 return 0; 342 343 return of_match_device(matches, dev) != NULL; 344 } 345 346 static int ibmebus_bus_device_probe(struct device *dev) 347 { 348 int error = -ENODEV; 349 struct platform_driver *drv; 350 struct platform_device *of_dev; 351 352 drv = to_platform_driver(dev->driver); 353 of_dev = to_platform_device(dev); 354 355 if (!drv->probe) 356 return error; 357 358 of_dev_get(of_dev); 359 360 if (of_driver_match_device(dev, dev->driver)) 361 error = drv->probe(of_dev); 362 if (error) 363 of_dev_put(of_dev); 364 365 return error; 366 } 367 368 static int ibmebus_bus_device_remove(struct device *dev) 369 { 370 struct platform_device *of_dev = to_platform_device(dev); 371 struct platform_driver *drv = to_platform_driver(dev->driver); 372 373 if (dev->driver && drv->remove) 374 drv->remove(of_dev); 375 return 0; 376 } 377 378 static void ibmebus_bus_device_shutdown(struct device *dev) 379 { 380 struct platform_device *of_dev = to_platform_device(dev); 381 struct platform_driver *drv = to_platform_driver(dev->driver); 382 383 if (dev->driver && drv->shutdown) 384 drv->shutdown(of_dev); 385 } 386 387 /* 388 * ibmebus_bus_device_attrs 389 */ 390 static ssize_t devspec_show(struct device *dev, 391 struct device_attribute *attr, char *buf) 392 { 393 struct platform_device *ofdev; 394 395 ofdev = to_platform_device(dev); 396 return sprintf(buf, "%pOF\n", ofdev->dev.of_node); 397 } 398 static DEVICE_ATTR_RO(devspec); 399 400 static ssize_t name_show(struct device *dev, 401 struct device_attribute *attr, char *buf) 402 { 403 struct platform_device *ofdev; 404 405 ofdev = to_platform_device(dev); 406 return sprintf(buf, "%pOFn\n", ofdev->dev.of_node); 407 } 408 static DEVICE_ATTR_RO(name); 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 static DEVICE_ATTR_RO(modalias); 416 417 static struct attribute *ibmebus_bus_device_attrs[] = { 418 &dev_attr_devspec.attr, 419 &dev_attr_name.attr, 420 &dev_attr_modalias.attr, 421 NULL, 422 }; 423 ATTRIBUTE_GROUPS(ibmebus_bus_device); 424 425 struct bus_type ibmebus_bus_type = { 426 .name = "ibmebus", 427 .uevent = of_device_uevent_modalias, 428 .bus_groups = ibmbus_bus_groups, 429 .match = ibmebus_bus_bus_match, 430 .probe = ibmebus_bus_device_probe, 431 .remove = ibmebus_bus_device_remove, 432 .shutdown = ibmebus_bus_device_shutdown, 433 .dev_groups = ibmebus_bus_device_groups, 434 }; 435 EXPORT_SYMBOL(ibmebus_bus_type); 436 437 static int __init ibmebus_bus_init(void) 438 { 439 int err; 440 441 printk(KERN_INFO "IBM eBus Device Driver\n"); 442 443 err = bus_register(&ibmebus_bus_type); 444 if (err) { 445 printk(KERN_ERR "%s: failed to register IBM eBus.\n", 446 __func__); 447 return err; 448 } 449 450 err = device_register(&ibmebus_bus_device); 451 if (err) { 452 printk(KERN_WARNING "%s: device_register returned %i\n", 453 __func__, err); 454 bus_unregister(&ibmebus_bus_type); 455 456 return err; 457 } 458 459 err = ibmebus_create_devices(ibmebus_matches); 460 if (err) { 461 device_unregister(&ibmebus_bus_device); 462 bus_unregister(&ibmebus_bus_type); 463 return err; 464 } 465 466 return 0; 467 } 468 machine_postcore_initcall(pseries, ibmebus_bus_init); 469