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 const 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_phys(struct device *dev, phys_addr_t phys, 90 size_t size, 91 enum dma_data_direction direction, 92 unsigned long attrs) 93 { 94 if (attrs & DMA_ATTR_MMIO) 95 return DMA_MAPPING_ERROR; 96 97 return (dma_addr_t)(phys_to_virt(phys)); 98 } 99 100 static void ibmebus_unmap_phys(struct device *dev, 101 dma_addr_t dma_addr, 102 size_t size, 103 enum dma_data_direction direction, 104 unsigned long attrs) 105 { 106 return; 107 } 108 109 static int ibmebus_map_sg(struct device *dev, 110 struct scatterlist *sgl, 111 int nents, enum dma_data_direction direction, 112 unsigned long attrs) 113 { 114 struct scatterlist *sg; 115 int i; 116 117 for_each_sg(sgl, sg, nents, i) { 118 sg->dma_address = (dma_addr_t) sg_virt(sg); 119 sg->dma_length = sg->length; 120 } 121 122 return nents; 123 } 124 125 static void ibmebus_unmap_sg(struct device *dev, 126 struct scatterlist *sg, 127 int nents, enum dma_data_direction direction, 128 unsigned long attrs) 129 { 130 return; 131 } 132 133 static int ibmebus_dma_supported(struct device *dev, u64 mask) 134 { 135 return mask == DMA_BIT_MASK(64); 136 } 137 138 static u64 ibmebus_dma_get_required_mask(struct device *dev) 139 { 140 return DMA_BIT_MASK(64); 141 } 142 143 static const struct dma_map_ops ibmebus_dma_ops = { 144 .alloc = ibmebus_alloc_coherent, 145 .free = ibmebus_free_coherent, 146 .map_sg = ibmebus_map_sg, 147 .unmap_sg = ibmebus_unmap_sg, 148 .dma_supported = ibmebus_dma_supported, 149 .get_required_mask = ibmebus_dma_get_required_mask, 150 .map_phys = ibmebus_map_phys, 151 .unmap_phys = ibmebus_unmap_phys, 152 }; 153 154 static int ibmebus_match_path(struct device *dev, const void *data) 155 { 156 struct device_node *dn = to_platform_device(dev)->dev.of_node; 157 struct device_node *tn = of_find_node_by_path(data); 158 159 of_node_put(tn); 160 161 return (tn == dn); 162 } 163 164 static int ibmebus_match_node(struct device *dev, const void *data) 165 { 166 return to_platform_device(dev)->dev.of_node == data; 167 } 168 169 static int ibmebus_create_device(struct device_node *dn) 170 { 171 struct platform_device *dev; 172 int ret; 173 174 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device); 175 if (!dev) 176 return -ENOMEM; 177 178 dev->dev.bus = &ibmebus_bus_type; 179 dev->dev.dma_ops = &ibmebus_dma_ops; 180 181 ret = of_device_add(dev); 182 if (ret) 183 platform_device_put(dev); 184 return ret; 185 } 186 187 static int ibmebus_create_devices(const struct of_device_id *matches) 188 { 189 struct device_node *root, *child; 190 struct device *dev; 191 int ret = 0; 192 193 root = of_find_node_by_path("/"); 194 195 for_each_child_of_node(root, child) { 196 if (!of_match_node(matches, child)) 197 continue; 198 199 dev = bus_find_device(&ibmebus_bus_type, NULL, child, 200 ibmebus_match_node); 201 if (dev) { 202 put_device(dev); 203 continue; 204 } 205 206 ret = ibmebus_create_device(child); 207 if (ret) { 208 printk(KERN_ERR "%s: failed to create device (%i)", 209 __func__, ret); 210 of_node_put(child); 211 break; 212 } 213 } 214 215 of_node_put(root); 216 return ret; 217 } 218 219 int ibmebus_register_driver(struct platform_driver *drv) 220 { 221 /* If the driver uses devices that ibmebus doesn't know, add them */ 222 ibmebus_create_devices(drv->driver.of_match_table); 223 224 drv->driver.bus = &ibmebus_bus_type; 225 return driver_register(&drv->driver); 226 } 227 EXPORT_SYMBOL(ibmebus_register_driver); 228 229 void ibmebus_unregister_driver(struct platform_driver *drv) 230 { 231 driver_unregister(&drv->driver); 232 } 233 EXPORT_SYMBOL(ibmebus_unregister_driver); 234 235 int ibmebus_request_irq(u32 ist, irq_handler_t handler, 236 unsigned long irq_flags, const char *devname, 237 void *dev_id) 238 { 239 unsigned int irq = irq_create_mapping(NULL, ist); 240 241 if (!irq) 242 return -EINVAL; 243 244 return request_irq(irq, handler, irq_flags, devname, dev_id); 245 } 246 EXPORT_SYMBOL(ibmebus_request_irq); 247 248 void ibmebus_free_irq(u32 ist, void *dev_id) 249 { 250 unsigned int irq = irq_find_mapping(NULL, ist); 251 252 free_irq(irq, dev_id); 253 irq_dispose_mapping(irq); 254 } 255 EXPORT_SYMBOL(ibmebus_free_irq); 256 257 static char *ibmebus_chomp(const char *in, size_t count) 258 { 259 char *out = kmalloc(count + 1, GFP_KERNEL); 260 261 if (!out) 262 return NULL; 263 264 memcpy(out, in, count); 265 out[count] = '\0'; 266 if (out[count - 1] == '\n') 267 out[count - 1] = '\0'; 268 269 return out; 270 } 271 272 static ssize_t probe_store(const struct bus_type *bus, const char *buf, size_t count) 273 { 274 struct device_node *dn = NULL; 275 struct device *dev; 276 char *path; 277 ssize_t rc = 0; 278 279 path = ibmebus_chomp(buf, count); 280 if (!path) 281 return -ENOMEM; 282 283 dev = bus_find_device(&ibmebus_bus_type, NULL, path, 284 ibmebus_match_path); 285 if (dev) { 286 put_device(dev); 287 printk(KERN_WARNING "%s: %s has already been probed\n", 288 __func__, path); 289 rc = -EEXIST; 290 goto out; 291 } 292 293 if ((dn = of_find_node_by_path(path))) { 294 rc = ibmebus_create_device(dn); 295 of_node_put(dn); 296 } else { 297 printk(KERN_WARNING "%s: no such device node: %s\n", 298 __func__, path); 299 rc = -ENODEV; 300 } 301 302 out: 303 kfree(path); 304 if (rc) 305 return rc; 306 return count; 307 } 308 static BUS_ATTR_WO(probe); 309 310 static ssize_t remove_store(const struct bus_type *bus, const char *buf, size_t count) 311 { 312 struct device *dev; 313 char *path; 314 315 path = ibmebus_chomp(buf, count); 316 if (!path) 317 return -ENOMEM; 318 319 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, 320 ibmebus_match_path))) { 321 of_device_unregister(to_platform_device(dev)); 322 put_device(dev); 323 324 kfree(path); 325 return count; 326 } else { 327 printk(KERN_WARNING "%s: %s not on the bus\n", 328 __func__, path); 329 330 kfree(path); 331 return -ENODEV; 332 } 333 } 334 static BUS_ATTR_WO(remove); 335 336 static struct attribute *ibmbus_bus_attrs[] = { 337 &bus_attr_probe.attr, 338 &bus_attr_remove.attr, 339 NULL, 340 }; 341 ATTRIBUTE_GROUPS(ibmbus_bus); 342 343 static int ibmebus_bus_bus_match(struct device *dev, const struct device_driver *drv) 344 { 345 const struct of_device_id *matches = drv->of_match_table; 346 347 if (!matches) 348 return 0; 349 350 return of_match_device(matches, dev) != NULL; 351 } 352 353 static int ibmebus_bus_device_probe(struct device *dev) 354 { 355 int error = -ENODEV; 356 struct platform_driver *drv; 357 struct platform_device *of_dev; 358 359 drv = to_platform_driver(dev->driver); 360 of_dev = to_platform_device(dev); 361 362 if (!drv->probe) 363 return error; 364 365 get_device(dev); 366 367 if (of_driver_match_device(dev, dev->driver)) 368 error = drv->probe(of_dev); 369 if (error) 370 put_device(dev); 371 372 return error; 373 } 374 375 static void ibmebus_bus_device_remove(struct device *dev) 376 { 377 struct platform_device *of_dev = to_platform_device(dev); 378 struct platform_driver *drv = to_platform_driver(dev->driver); 379 380 if (dev->driver && drv->remove) 381 drv->remove(of_dev); 382 } 383 384 static void ibmebus_bus_device_shutdown(struct device *dev) 385 { 386 struct platform_device *of_dev = to_platform_device(dev); 387 struct platform_driver *drv = to_platform_driver(dev->driver); 388 389 if (dev->driver && drv->shutdown) 390 drv->shutdown(of_dev); 391 } 392 393 /* 394 * ibmebus_bus_device_attrs 395 */ 396 static ssize_t devspec_show(struct device *dev, 397 struct device_attribute *attr, char *buf) 398 { 399 struct platform_device *ofdev; 400 401 ofdev = to_platform_device(dev); 402 return sprintf(buf, "%pOF\n", ofdev->dev.of_node); 403 } 404 static DEVICE_ATTR_RO(devspec); 405 406 static ssize_t name_show(struct device *dev, 407 struct device_attribute *attr, char *buf) 408 { 409 struct platform_device *ofdev; 410 411 ofdev = to_platform_device(dev); 412 return sprintf(buf, "%pOFn\n", ofdev->dev.of_node); 413 } 414 static DEVICE_ATTR_RO(name); 415 416 static ssize_t modalias_show(struct device *dev, 417 struct device_attribute *attr, char *buf) 418 { 419 return of_device_modalias(dev, buf, PAGE_SIZE); 420 } 421 static DEVICE_ATTR_RO(modalias); 422 423 static struct attribute *ibmebus_bus_device_attrs[] = { 424 &dev_attr_devspec.attr, 425 &dev_attr_name.attr, 426 &dev_attr_modalias.attr, 427 NULL, 428 }; 429 ATTRIBUTE_GROUPS(ibmebus_bus_device); 430 431 static int ibmebus_bus_modalias(const struct device *dev, struct kobj_uevent_env *env) 432 { 433 return of_device_uevent_modalias(dev, env); 434 } 435 436 const struct bus_type ibmebus_bus_type = { 437 .name = "ibmebus", 438 .uevent = ibmebus_bus_modalias, 439 .bus_groups = ibmbus_bus_groups, 440 .match = ibmebus_bus_bus_match, 441 .probe = ibmebus_bus_device_probe, 442 .remove = ibmebus_bus_device_remove, 443 .shutdown = ibmebus_bus_device_shutdown, 444 .dev_groups = ibmebus_bus_device_groups, 445 }; 446 EXPORT_SYMBOL(ibmebus_bus_type); 447 448 static int __init ibmebus_bus_init(void) 449 { 450 int err; 451 452 printk(KERN_INFO "IBM eBus Device Driver\n"); 453 454 err = bus_register(&ibmebus_bus_type); 455 if (err) { 456 printk(KERN_ERR "%s: failed to register IBM eBus.\n", 457 __func__); 458 return err; 459 } 460 461 err = device_register(&ibmebus_bus_device); 462 if (err) { 463 printk(KERN_WARNING "%s: device_register returned %i\n", 464 __func__, err); 465 put_device(&ibmebus_bus_device); 466 bus_unregister(&ibmebus_bus_type); 467 468 return err; 469 } 470 471 err = ibmebus_create_devices(ibmebus_matches); 472 if (err) { 473 device_unregister(&ibmebus_bus_device); 474 bus_unregister(&ibmebus_bus_type); 475 return err; 476 } 477 478 return 0; 479 } 480 machine_postcore_initcall(pseries, ibmebus_bus_init); 481