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 <asm/ibmebus.h> 51 #include <asm/machdep.h> 52 53 static struct device ibmebus_bus_device = { /* fake "parent" device */ 54 .init_name = "ibmebus", 55 }; 56 57 struct bus_type ibmebus_bus_type; 58 59 /* These devices will automatically be added to the bus during init */ 60 static const struct of_device_id ibmebus_matches[] __initconst = { 61 { .compatible = "IBM,lhca" }, 62 { .compatible = "IBM,lhea" }, 63 {}, 64 }; 65 66 static void *ibmebus_alloc_coherent(struct device *dev, 67 size_t size, 68 dma_addr_t *dma_handle, 69 gfp_t flag, 70 unsigned long attrs) 71 { 72 void *mem; 73 74 mem = kmalloc(size, flag); 75 *dma_handle = (dma_addr_t)mem; 76 77 return mem; 78 } 79 80 static void ibmebus_free_coherent(struct device *dev, 81 size_t size, void *vaddr, 82 dma_addr_t dma_handle, 83 unsigned long attrs) 84 { 85 kfree(vaddr); 86 } 87 88 static dma_addr_t ibmebus_map_page(struct device *dev, 89 struct page *page, 90 unsigned long offset, 91 size_t size, 92 enum dma_data_direction direction, 93 unsigned long attrs) 94 { 95 return (dma_addr_t)(page_address(page) + offset); 96 } 97 98 static void ibmebus_unmap_page(struct device *dev, 99 dma_addr_t dma_addr, 100 size_t size, 101 enum dma_data_direction direction, 102 unsigned long attrs) 103 { 104 return; 105 } 106 107 static int ibmebus_map_sg(struct device *dev, 108 struct scatterlist *sgl, 109 int nents, enum dma_data_direction direction, 110 unsigned long attrs) 111 { 112 struct scatterlist *sg; 113 int i; 114 115 for_each_sg(sgl, sg, nents, i) { 116 sg->dma_address = (dma_addr_t) sg_virt(sg); 117 sg->dma_length = sg->length; 118 } 119 120 return nents; 121 } 122 123 static void ibmebus_unmap_sg(struct device *dev, 124 struct scatterlist *sg, 125 int nents, enum dma_data_direction direction, 126 unsigned long attrs) 127 { 128 return; 129 } 130 131 static int ibmebus_dma_supported(struct device *dev, u64 mask) 132 { 133 return mask == DMA_BIT_MASK(64); 134 } 135 136 static u64 ibmebus_dma_get_required_mask(struct device *dev) 137 { 138 return DMA_BIT_MASK(64); 139 } 140 141 static const struct dma_map_ops ibmebus_dma_ops = { 142 .alloc = ibmebus_alloc_coherent, 143 .free = ibmebus_free_coherent, 144 .map_sg = ibmebus_map_sg, 145 .unmap_sg = ibmebus_unmap_sg, 146 .dma_supported = ibmebus_dma_supported, 147 .get_required_mask = ibmebus_dma_get_required_mask, 148 .map_page = ibmebus_map_page, 149 .unmap_page = ibmebus_unmap_page, 150 }; 151 152 static int ibmebus_match_path(struct device *dev, const void *data) 153 { 154 struct device_node *dn = to_platform_device(dev)->dev.of_node; 155 struct device_node *tn = of_find_node_by_path(data); 156 157 of_node_put(tn); 158 159 return (tn == dn); 160 } 161 162 static int ibmebus_match_node(struct device *dev, const void *data) 163 { 164 return to_platform_device(dev)->dev.of_node == data; 165 } 166 167 static int ibmebus_create_device(struct device_node *dn) 168 { 169 struct platform_device *dev; 170 int ret; 171 172 dev = of_device_alloc(dn, NULL, &ibmebus_bus_device); 173 if (!dev) 174 return -ENOMEM; 175 176 dev->dev.bus = &ibmebus_bus_type; 177 dev->dev.dma_ops = &ibmebus_dma_ops; 178 179 ret = of_device_add(dev); 180 if (ret) 181 platform_device_put(dev); 182 return ret; 183 } 184 185 static int ibmebus_create_devices(const struct of_device_id *matches) 186 { 187 struct device_node *root, *child; 188 struct device *dev; 189 int ret = 0; 190 191 root = of_find_node_by_path("/"); 192 193 for_each_child_of_node(root, child) { 194 if (!of_match_node(matches, child)) 195 continue; 196 197 dev = bus_find_device(&ibmebus_bus_type, NULL, child, 198 ibmebus_match_node); 199 if (dev) { 200 put_device(dev); 201 continue; 202 } 203 204 ret = ibmebus_create_device(child); 205 if (ret) { 206 printk(KERN_ERR "%s: failed to create device (%i)", 207 __func__, ret); 208 of_node_put(child); 209 break; 210 } 211 } 212 213 of_node_put(root); 214 return ret; 215 } 216 217 int ibmebus_register_driver(struct platform_driver *drv) 218 { 219 /* If the driver uses devices that ibmebus doesn't know, add them */ 220 ibmebus_create_devices(drv->driver.of_match_table); 221 222 drv->driver.bus = &ibmebus_bus_type; 223 return driver_register(&drv->driver); 224 } 225 EXPORT_SYMBOL(ibmebus_register_driver); 226 227 void ibmebus_unregister_driver(struct platform_driver *drv) 228 { 229 driver_unregister(&drv->driver); 230 } 231 EXPORT_SYMBOL(ibmebus_unregister_driver); 232 233 int ibmebus_request_irq(u32 ist, irq_handler_t handler, 234 unsigned long irq_flags, const char *devname, 235 void *dev_id) 236 { 237 unsigned int irq = irq_create_mapping(NULL, ist); 238 239 if (!irq) 240 return -EINVAL; 241 242 return request_irq(irq, handler, irq_flags, devname, dev_id); 243 } 244 EXPORT_SYMBOL(ibmebus_request_irq); 245 246 void ibmebus_free_irq(u32 ist, void *dev_id) 247 { 248 unsigned int irq = irq_find_mapping(NULL, ist); 249 250 free_irq(irq, dev_id); 251 irq_dispose_mapping(irq); 252 } 253 EXPORT_SYMBOL(ibmebus_free_irq); 254 255 static char *ibmebus_chomp(const char *in, size_t count) 256 { 257 char *out = kmalloc(count + 1, GFP_KERNEL); 258 259 if (!out) 260 return NULL; 261 262 memcpy(out, in, count); 263 out[count] = '\0'; 264 if (out[count - 1] == '\n') 265 out[count - 1] = '\0'; 266 267 return out; 268 } 269 270 static ssize_t probe_store(struct bus_type *bus, const char *buf, size_t count) 271 { 272 struct device_node *dn = NULL; 273 struct device *dev; 274 char *path; 275 ssize_t rc = 0; 276 277 path = ibmebus_chomp(buf, count); 278 if (!path) 279 return -ENOMEM; 280 281 dev = bus_find_device(&ibmebus_bus_type, NULL, path, 282 ibmebus_match_path); 283 if (dev) { 284 put_device(dev); 285 printk(KERN_WARNING "%s: %s has already been probed\n", 286 __func__, path); 287 rc = -EEXIST; 288 goto out; 289 } 290 291 if ((dn = of_find_node_by_path(path))) { 292 rc = ibmebus_create_device(dn); 293 of_node_put(dn); 294 } else { 295 printk(KERN_WARNING "%s: no such device node: %s\n", 296 __func__, path); 297 rc = -ENODEV; 298 } 299 300 out: 301 kfree(path); 302 if (rc) 303 return rc; 304 return count; 305 } 306 static BUS_ATTR_WO(probe); 307 308 static ssize_t remove_store(struct bus_type *bus, const char *buf, size_t count) 309 { 310 struct device *dev; 311 char *path; 312 313 path = ibmebus_chomp(buf, count); 314 if (!path) 315 return -ENOMEM; 316 317 if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path, 318 ibmebus_match_path))) { 319 of_device_unregister(to_platform_device(dev)); 320 put_device(dev); 321 322 kfree(path); 323 return count; 324 } else { 325 printk(KERN_WARNING "%s: %s not on the bus\n", 326 __func__, path); 327 328 kfree(path); 329 return -ENODEV; 330 } 331 } 332 static BUS_ATTR_WO(remove); 333 334 static struct attribute *ibmbus_bus_attrs[] = { 335 &bus_attr_probe.attr, 336 &bus_attr_remove.attr, 337 NULL, 338 }; 339 ATTRIBUTE_GROUPS(ibmbus_bus); 340 341 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv) 342 { 343 const struct of_device_id *matches = drv->of_match_table; 344 345 if (!matches) 346 return 0; 347 348 return of_match_device(matches, dev) != NULL; 349 } 350 351 static int ibmebus_bus_device_probe(struct device *dev) 352 { 353 int error = -ENODEV; 354 struct platform_driver *drv; 355 struct platform_device *of_dev; 356 357 drv = to_platform_driver(dev->driver); 358 of_dev = to_platform_device(dev); 359 360 if (!drv->probe) 361 return error; 362 363 get_device(dev); 364 365 if (of_driver_match_device(dev, dev->driver)) 366 error = drv->probe(of_dev); 367 if (error) 368 put_device(dev); 369 370 return error; 371 } 372 373 static void ibmebus_bus_device_remove(struct device *dev) 374 { 375 struct platform_device *of_dev = to_platform_device(dev); 376 struct platform_driver *drv = to_platform_driver(dev->driver); 377 378 if (dev->driver && drv->remove) 379 drv->remove(of_dev); 380 } 381 382 static void ibmebus_bus_device_shutdown(struct device *dev) 383 { 384 struct platform_device *of_dev = to_platform_device(dev); 385 struct platform_driver *drv = to_platform_driver(dev->driver); 386 387 if (dev->driver && drv->shutdown) 388 drv->shutdown(of_dev); 389 } 390 391 /* 392 * ibmebus_bus_device_attrs 393 */ 394 static ssize_t devspec_show(struct device *dev, 395 struct device_attribute *attr, char *buf) 396 { 397 struct platform_device *ofdev; 398 399 ofdev = to_platform_device(dev); 400 return sprintf(buf, "%pOF\n", ofdev->dev.of_node); 401 } 402 static DEVICE_ATTR_RO(devspec); 403 404 static ssize_t name_show(struct device *dev, 405 struct device_attribute *attr, char *buf) 406 { 407 struct platform_device *ofdev; 408 409 ofdev = to_platform_device(dev); 410 return sprintf(buf, "%pOFn\n", ofdev->dev.of_node); 411 } 412 static DEVICE_ATTR_RO(name); 413 414 static ssize_t modalias_show(struct device *dev, 415 struct device_attribute *attr, char *buf) 416 { 417 return of_device_modalias(dev, buf, PAGE_SIZE); 418 } 419 static DEVICE_ATTR_RO(modalias); 420 421 static struct attribute *ibmebus_bus_device_attrs[] = { 422 &dev_attr_devspec.attr, 423 &dev_attr_name.attr, 424 &dev_attr_modalias.attr, 425 NULL, 426 }; 427 ATTRIBUTE_GROUPS(ibmebus_bus_device); 428 429 struct bus_type ibmebus_bus_type = { 430 .name = "ibmebus", 431 .uevent = of_device_uevent_modalias, 432 .bus_groups = ibmbus_bus_groups, 433 .match = ibmebus_bus_bus_match, 434 .probe = ibmebus_bus_device_probe, 435 .remove = ibmebus_bus_device_remove, 436 .shutdown = ibmebus_bus_device_shutdown, 437 .dev_groups = ibmebus_bus_device_groups, 438 }; 439 EXPORT_SYMBOL(ibmebus_bus_type); 440 441 static int __init ibmebus_bus_init(void) 442 { 443 int err; 444 445 printk(KERN_INFO "IBM eBus Device Driver\n"); 446 447 err = bus_register(&ibmebus_bus_type); 448 if (err) { 449 printk(KERN_ERR "%s: failed to register IBM eBus.\n", 450 __func__); 451 return err; 452 } 453 454 err = device_register(&ibmebus_bus_device); 455 if (err) { 456 printk(KERN_WARNING "%s: device_register returned %i\n", 457 __func__, err); 458 bus_unregister(&ibmebus_bus_type); 459 460 return err; 461 } 462 463 err = ibmebus_create_devices(ibmebus_matches); 464 if (err) { 465 device_unregister(&ibmebus_bus_device); 466 bus_unregister(&ibmebus_bus_type); 467 return err; 468 } 469 470 return 0; 471 } 472 machine_postcore_initcall(pseries, ibmebus_bus_init); 473