arch/powerpc/kernel/ibmebus.c

   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/console.h>
  41 #include <linux/kobject.h>
  42 #include <linux/dma-mapping.h>
  43 #include <linux/interrupt.h>
  44 #include <asm/ibmebus.h>
  45 #include <asm/abs_addr.h>
  46
  47 static struct device ibmebus_bus_device = { /* fake "parent" device */
  48         .bus_id = "ibmebus",
  49 };
  50
  51 struct bus_type ibmebus_bus_type;
  52
  53 static void *ibmebus_alloc_coherent(struct device *dev,
  54                                     size_t size,
  55                                     dma_addr_t *dma_handle,
  56                                     gfp_t flag)
  57 {
  58         void *mem;
  59
  60         mem = kmalloc(size, flag);
  61         *dma_handle = (dma_addr_t)mem;
  62
  63         return mem;
  64 }
  65
  66 static void ibmebus_free_coherent(struct device *dev,
  67                                   size_t size, void *vaddr,
  68                                   dma_addr_t dma_handle)
  69 {
  70         kfree(vaddr);
  71 }
  72
  73 static dma_addr_t ibmebus_map_single(struct device *dev,
  74                                      void *ptr,
  75                                      size_t size,
  76                                      enum dma_data_direction direction)
  77 {
  78         return (dma_addr_t)(ptr);
  79 }
  80
  81 static void ibmebus_unmap_single(struct device *dev,
  82                                  dma_addr_t dma_addr,
  83                                  size_t size,
  84                                  enum dma_data_direction direction)
  85 {
  86         return;
  87 }
  88
  89 static int ibmebus_map_sg(struct device *dev,
  90                           struct scatterlist *sg,
  91                           int nents, enum dma_data_direction direction)
  92 {
  93         int i;
  94
  95         for (i = 0; i < nents; i++) {
  96                 sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
  97                         + sg[i].offset;
  98                 sg[i].dma_length = sg[i].length;
  99         }
 100
 101         return nents;
 102 }
 103
 104 static void ibmebus_unmap_sg(struct device *dev,
 105                              struct scatterlist *sg,
 106                              int nents, enum dma_data_direction direction)
 107 {
 108         return;
 109 }
 110
 111 static int ibmebus_dma_supported(struct device *dev, u64 mask)
 112 {
 113         return 1;
 114 }
 115
 116 static struct dma_mapping_ops ibmebus_dma_ops = {
 117         .alloc_coherent = ibmebus_alloc_coherent,
 118         .free_coherent  = ibmebus_free_coherent,
 119         .map_single     = ibmebus_map_single,
 120         .unmap_single   = ibmebus_unmap_single,
 121         .map_sg         = ibmebus_map_sg,
 122         .unmap_sg       = ibmebus_unmap_sg,
 123         .dma_supported  = ibmebus_dma_supported,
 124 };
 125
 126 static int ibmebus_bus_probe(struct device *dev)
 127 {
 128         struct ibmebus_dev *ibmebusdev    = to_ibmebus_dev(dev);
 129         struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
 130         const struct of_device_id *id;
 131         int error = -ENODEV;
 132
 133         if (!ibmebusdrv->probe)
 134                 return error;
 135
 136         id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
 137         if (id) {
 138                 error = ibmebusdrv->probe(ibmebusdev, id);
 139         }
 140
 141         return error;
 142 }
 143
 144 static int ibmebus_bus_remove(struct device *dev)
 145 {
 146         struct ibmebus_dev *ibmebusdev    = to_ibmebus_dev(dev);
 147         struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
 148
 149         if (ibmebusdrv->remove) {
 150                 return ibmebusdrv->remove(ibmebusdev);
 151         }
 152
 153         return 0;
 154 }
 155
 156 static void __devinit ibmebus_dev_release(struct device *dev)
 157 {
 158         of_node_put(to_ibmebus_dev(dev)->ofdev.node);
 159         kfree(to_ibmebus_dev(dev));
 160 }
 161
 162 static int __devinit ibmebus_register_device_common(
 163         struct ibmebus_dev *dev, const char *name)
 164 {
 165         int err = 0;
 166
 167         dev->ofdev.dev.parent  = &ibmebus_bus_device;
 168         dev->ofdev.dev.bus     = &ibmebus_bus_type;
 169         dev->ofdev.dev.release = ibmebus_dev_release;
 170
 171         dev->ofdev.dev.archdata.of_node = dev->ofdev.node;
 172         dev->ofdev.dev.archdata.dma_ops = &ibmebus_dma_ops;
 173         dev->ofdev.dev.archdata.numa_node = of_node_to_nid(dev->ofdev.node);
 174
 175         /* An ibmebusdev is based on a of_device. We have to change the
 176          * bus type to use our own DMA mapping operations.
 177          */
 178         if ((err = of_device_register(&dev->ofdev)) != 0) {
 179                 printk(KERN_ERR "%s: failed to register device (%d).\n",
 180                        __FUNCTION__, err);
 181                 return -ENODEV;
 182         }
 183
 184         return 0;
 185 }
 186
 187 static struct ibmebus_dev* __devinit ibmebus_register_device_node(
 188         struct device_node *dn)
 189 {
 190         struct ibmebus_dev *dev;
 191         int i, len, bus_len;
 192
 193         dev = kzalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
 194         if (!dev)
 195                 return ERR_PTR(-ENOMEM);
 196
 197         dev->ofdev.node = of_node_get(dn);
 198
 199         len = strlen(dn->full_name + 1);
 200         bus_len = min(len, BUS_ID_SIZE - 1);
 201         memcpy(dev->ofdev.dev.bus_id, dn->full_name + 1
 202                + (len - bus_len), bus_len);
 203         for (i = 0; i < bus_len; i++)
 204                 if (dev->ofdev.dev.bus_id[i] == '/')
 205                         dev->ofdev.dev.bus_id[i] = '_';
 206
 207         /* Register with generic device framework. */
 208         if (ibmebus_register_device_common(dev, dn->name) != 0) {
 209                 kfree(dev);
 210                 return ERR_PTR(-ENODEV);
 211         }
 212
 213         return dev;
 214 }
 215
 216 static void ibmebus_probe_of_nodes(char* name)
 217 {
 218         struct device_node *dn = NULL;
 219
 220         while ((dn = of_find_node_by_name(dn, name))) {
 221                 if (IS_ERR(ibmebus_register_device_node(dn))) {
 222                         of_node_put(dn);
 223                         return;
 224                 }
 225         }
 226
 227         of_node_put(dn);
 228
 229         return;
 230 }
 231
 232 static void ibmebus_add_devices_by_id(struct of_device_id *idt)
 233 {
 234         while (strlen(idt->name) > 0) {
 235                 ibmebus_probe_of_nodes(idt->name);
 236                 idt++;
 237         }
 238
 239         return;
 240 }
 241
 242 static int ibmebus_match_name(struct device *dev, void *data)
 243 {
 244         const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
 245         const char *name;
 246
 247         name = of_get_property(ebus_dev->ofdev.node, "name", NULL);
 248
 249         if (name && (strcmp(data, name) == 0))
 250                 return 1;
 251
 252         return 0;
 253 }
 254
 255 static int ibmebus_unregister_device(struct device *dev)
 256 {
 257         of_device_unregister(to_of_device(dev));
 258
 259         return 0;
 260 }
 261
 262 static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
 263 {
 264         struct device *dev;
 265
 266         while (strlen(idt->name) > 0) {
 267                 while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
 268                                               (void*)idt->name,
 269                                               ibmebus_match_name))) {
 270                         ibmebus_unregister_device(dev);
 271                 }
 272                 idt++;
 273         }
 274
 275         return;
 276 }
 277
 278 int ibmebus_register_driver(struct ibmebus_driver *drv)
 279 {
 280         int err = 0;
 281
 282         drv->driver.name   = drv->name;
 283         drv->driver.bus    = &ibmebus_bus_type;
 284         drv->driver.probe  = ibmebus_bus_probe;
 285         drv->driver.remove = ibmebus_bus_remove;
 286
 287         if ((err = driver_register(&drv->driver) != 0))
 288                 return err;
 289
 290         /* remove all supported devices first, in case someone
 291          * probed them manually before registering the driver */
 292         ibmebus_remove_devices_by_id(drv->id_table);
 293         ibmebus_add_devices_by_id(drv->id_table);
 294
 295         return 0;
 296 }
 297 EXPORT_SYMBOL(ibmebus_register_driver);
 298
 299 void ibmebus_unregister_driver(struct ibmebus_driver *drv)
 300 {
 301         driver_unregister(&drv->driver);
 302         ibmebus_remove_devices_by_id(drv->id_table);
 303 }
 304 EXPORT_SYMBOL(ibmebus_unregister_driver);
 305
 306 int ibmebus_request_irq(struct ibmebus_dev *dev,
 307                         u32 ist,
 308                         irq_handler_t handler,
 309                         unsigned long irq_flags, const char * devname,
 310                         void *dev_id)
 311 {
 312         unsigned int irq = irq_create_mapping(NULL, ist);
 313
 314         if (irq == NO_IRQ)
 315                 return -EINVAL;
 316
 317         return request_irq(irq, handler,
 318                            irq_flags, devname, dev_id);
 319 }
 320 EXPORT_SYMBOL(ibmebus_request_irq);
 321
 322 void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
 323 {
 324         unsigned int irq = irq_find_mapping(NULL, ist);
 325
 326         free_irq(irq, dev_id);
 327 }
 328 EXPORT_SYMBOL(ibmebus_free_irq);
 329
 330 static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
 331 {
 332         const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
 333         struct ibmebus_driver *ebus_drv    = to_ibmebus_driver(drv);
 334         const struct of_device_id *ids     = ebus_drv->id_table;
 335         const struct of_device_id *found_id;
 336
 337         if (!ids)
 338                 return 0;
 339
 340         found_id = of_match_device(ids, &ebus_dev->ofdev);
 341         if (found_id)
 342                 return 1;
 343
 344         return 0;
 345 }
 346
 347 static ssize_t name_show(struct device *dev,
 348                          struct device_attribute *attr, char *buf)
 349 {
 350         struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
 351         const char *name = of_get_property(ebus_dev->ofdev.node, "name", NULL);
 352         return sprintf(buf, "%s\n", name);
 353 }
 354
 355 static struct device_attribute ibmebus_dev_attrs[] = {
 356         __ATTR_RO(name),
 357         __ATTR_NULL
 358 };
 359
 360 static int ibmebus_match_path(struct device *dev, void *data)
 361 {
 362         int rc;
 363         struct device_node *dn =
 364                 of_node_get(to_ibmebus_dev(dev)->ofdev.node);
 365
 366         rc = (dn->full_name && (strcasecmp((char*)data, dn->full_name) == 0));
 367
 368         of_node_put(dn);
 369         return rc;
 370 }
 371
 372 static char *ibmebus_chomp(const char *in, size_t count)
 373 {
 374         char *out = kmalloc(count + 1, GFP_KERNEL);
 375
 376         if (!out)
 377                 return NULL;
 378
 379         memcpy(out, in, count);
 380         out[count] = '\0';
 381         if (out[count - 1] == '\n')
 382                 out[count - 1] = '\0';
 383
 384         return out;
 385 }
 386
 387 static ssize_t ibmebus_store_probe(struct bus_type *bus,
 388                                    const char *buf, size_t count)
 389 {
 390         struct device_node *dn = NULL;
 391         struct ibmebus_dev *dev;
 392         char *path;
 393         ssize_t rc;
 394
 395         path = ibmebus_chomp(buf, count);
 396         if (!path)
 397                 return -ENOMEM;
 398
 399         if (bus_find_device(&ibmebus_bus_type, NULL, path,
 400                             ibmebus_match_path)) {
 401                 printk(KERN_WARNING "%s: %s has already been probed\n",
 402                        __FUNCTION__, path);
 403                 rc = -EEXIST;
 404                 goto out;
 405         }
 406
 407         if ((dn = of_find_node_by_path(path))) {
 408                 dev = ibmebus_register_device_node(dn);
 409                 of_node_put(dn);
 410                 rc = IS_ERR(dev) ? PTR_ERR(dev) : count;
 411         } else {
 412                 printk(KERN_WARNING "%s: no such device node: %s\n",
 413                        __FUNCTION__, path);
 414                 rc = -ENODEV;
 415         }
 416
 417 out:
 418         kfree(path);
 419         return rc;
 420 }
 421
 422 static ssize_t ibmebus_store_remove(struct bus_type *bus,
 423                                     const char *buf, size_t count)
 424 {
 425         struct device *dev;
 426         char *path;
 427
 428         path = ibmebus_chomp(buf, count);
 429         if (!path)
 430                 return -ENOMEM;
 431
 432         if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
 433                                    ibmebus_match_path))) {
 434                 ibmebus_unregister_device(dev);
 435
 436                 kfree(path);
 437                 return count;
 438         } else {
 439                 printk(KERN_WARNING "%s: %s not on the bus\n",
 440                        __FUNCTION__, path);
 441
 442                 kfree(path);
 443                 return -ENODEV;
 444         }
 445 }
 446
 447 static struct bus_attribute ibmebus_bus_attrs[] = {
 448         __ATTR(probe, S_IWUSR, NULL, ibmebus_store_probe),
 449         __ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove),
 450         __ATTR_NULL
 451 };
 452
 453 struct bus_type ibmebus_bus_type = {
 454         .name      = "ibmebus",
 455         .match     = ibmebus_bus_match,
 456         .dev_attrs = ibmebus_dev_attrs,
 457         .bus_attrs = ibmebus_bus_attrs
 458 };
 459 EXPORT_SYMBOL(ibmebus_bus_type);
 460
 461 static int __init ibmebus_bus_init(void)
 462 {
 463         int err;
 464
 465         printk(KERN_INFO "IBM eBus Device Driver\n");
 466
 467         err = bus_register(&ibmebus_bus_type);
 468         if (err) {
 469                 printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
 470                        __FUNCTION__);
 471                 return err;
 472         }
 473
 474         err = device_register(&ibmebus_bus_device);
 475         if (err) {
 476                 printk(KERN_WARNING "%s: device_register returned %i\n",
 477                        __FUNCTION__, err);
 478                 bus_unregister(&ibmebus_bus_type);
 479
 480                 return err;
 481         }
 482
 483         return 0;
 484 }
 485 __initcall(ibmebus_bus_init);