arch/powerpc/platforms/pseries/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/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 (of_find_node_by_path(data) == dn);
 154 }
 155
 156 static int ibmebus_match_node(struct device *dev, void *data)
 157 {
 158         return to_platform_device(dev)->dev.of_node == data;
 159 }
 160
 161 static int ibmebus_create_device(struct device_node *dn)
 162 {
 163         struct platform_device *dev;
 164         int ret;
 165
 166         dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
 167         if (!dev)
 168                 return -ENOMEM;
 169
 170         dev->dev.bus = &ibmebus_bus_type;
 171         dev->dev.dma_ops = &ibmebus_dma_ops;
 172
 173         ret = of_device_add(dev);
 174         if (ret)
 175                 platform_device_put(dev);
 176         return ret;
 177 }
 178
 179 static int ibmebus_create_devices(const struct of_device_id *matches)
 180 {
 181         struct device_node *root, *child;
 182         struct device *dev;
 183         int ret = 0;
 184
 185         root = of_find_node_by_path("/");
 186
 187         for_each_child_of_node(root, child) {
 188                 if (!of_match_node(matches, child))
 189                         continue;
 190
 191                 dev = bus_find_device(&ibmebus_bus_type, NULL, child,
 192                                       ibmebus_match_node);
 193                 if (dev) {
 194                         put_device(dev);
 195                         continue;
 196                 }
 197
 198                 ret = ibmebus_create_device(child);
 199                 if (ret) {
 200                         printk(KERN_ERR "%s: failed to create device (%i)",
 201                                __func__, ret);
 202                         of_node_put(child);
 203                         break;
 204                 }
 205         }
 206
 207         of_node_put(root);
 208         return ret;
 209 }
 210
 211 int ibmebus_register_driver(struct platform_driver *drv)
 212 {
 213         /* If the driver uses devices that ibmebus doesn't know, add them */
 214         ibmebus_create_devices(drv->driver.of_match_table);
 215
 216         drv->driver.bus = &ibmebus_bus_type;
 217         return driver_register(&drv->driver);
 218 }
 219 EXPORT_SYMBOL(ibmebus_register_driver);
 220
 221 void ibmebus_unregister_driver(struct platform_driver *drv)
 222 {
 223         driver_unregister(&drv->driver);
 224 }
 225 EXPORT_SYMBOL(ibmebus_unregister_driver);
 226
 227 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
 228                         unsigned long irq_flags, const char *devname,
 229                         void *dev_id)
 230 {
 231         unsigned int irq = irq_create_mapping(NULL, ist);
 232
 233         if (!irq)
 234                 return -EINVAL;
 235
 236         return request_irq(irq, handler, irq_flags, devname, dev_id);
 237 }
 238 EXPORT_SYMBOL(ibmebus_request_irq);
 239
 240 void ibmebus_free_irq(u32 ist, void *dev_id)
 241 {
 242         unsigned int irq = irq_find_mapping(NULL, ist);
 243
 244         free_irq(irq, dev_id);
 245         irq_dispose_mapping(irq);
 246 }
 247 EXPORT_SYMBOL(ibmebus_free_irq);
 248
 249 static char *ibmebus_chomp(const char *in, size_t count)
 250 {
 251         char *out = kmalloc(count + 1, GFP_KERNEL);
 252
 253         if (!out)
 254                 return NULL;
 255
 256         memcpy(out, in, count);
 257         out[count] = '\0';
 258         if (out[count - 1] == '\n')
 259                 out[count - 1] = '\0';
 260
 261         return out;
 262 }
 263
 264 static ssize_t ibmebus_store_probe(struct bus_type *bus,
 265                                    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(probe, S_IWUSR, NULL, ibmebus_store_probe);
 302
 303 static ssize_t ibmebus_store_remove(struct bus_type *bus,
 304                                     const char *buf, size_t count)
 305 {
 306         struct device *dev;
 307         char *path;
 308
 309         path = ibmebus_chomp(buf, count);
 310         if (!path)
 311                 return -ENOMEM;
 312
 313         if ((dev = bus_find_device(&ibmebus_bus_type, NULL, path,
 314                                    ibmebus_match_path))) {
 315                 of_device_unregister(to_platform_device(dev));
 316                 put_device(dev);
 317
 318                 kfree(path);
 319                 return count;
 320         } else {
 321                 printk(KERN_WARNING "%s: %s not on the bus\n",
 322                        __func__, path);
 323
 324                 kfree(path);
 325                 return -ENODEV;
 326         }
 327 }
 328 static BUS_ATTR(remove, S_IWUSR, NULL, ibmebus_store_remove);
 329
 330 static struct attribute *ibmbus_bus_attrs[] = {
 331         &bus_attr_probe.attr,
 332         &bus_attr_remove.attr,
 333         NULL,
 334 };
 335 ATTRIBUTE_GROUPS(ibmbus_bus);
 336
 337 static int ibmebus_bus_bus_match(struct device *dev, struct device_driver *drv)
 338 {
 339         const struct of_device_id *matches = drv->of_match_table;
 340
 341         if (!matches)
 342                 return 0;
 343
 344         return of_match_device(matches, dev) != NULL;
 345 }
 346
 347 static int ibmebus_bus_device_probe(struct device *dev)
 348 {
 349         int error = -ENODEV;
 350         struct platform_driver *drv;
 351         struct platform_device *of_dev;
 352
 353         drv = to_platform_driver(dev->driver);
 354         of_dev = to_platform_device(dev);
 355
 356         if (!drv->probe)
 357                 return error;
 358
 359         of_dev_get(of_dev);
 360
 361         if (of_driver_match_device(dev, dev->driver))
 362                 error = drv->probe(of_dev);
 363         if (error)
 364                 of_dev_put(of_dev);
 365
 366         return error;
 367 }
 368
 369 static int ibmebus_bus_device_remove(struct device *dev)
 370 {
 371         struct platform_device *of_dev = to_platform_device(dev);
 372         struct platform_driver *drv = to_platform_driver(dev->driver);
 373
 374         if (dev->driver && drv->remove)
 375                 drv->remove(of_dev);
 376         return 0;
 377 }
 378
 379 static void ibmebus_bus_device_shutdown(struct device *dev)
 380 {
 381         struct platform_device *of_dev = to_platform_device(dev);
 382         struct platform_driver *drv = to_platform_driver(dev->driver);
 383
 384         if (dev->driver && drv->shutdown)
 385                 drv->shutdown(of_dev);
 386 }
 387
 388 /*
 389  * ibmebus_bus_device_attrs
 390  */
 391 static ssize_t devspec_show(struct device *dev,
 392                                 struct device_attribute *attr, char *buf)
 393 {
 394         struct platform_device *ofdev;
 395
 396         ofdev = to_platform_device(dev);
 397         return sprintf(buf, "%pOF\n", ofdev->dev.of_node);
 398 }
 399 static DEVICE_ATTR_RO(devspec);
 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 static DEVICE_ATTR_RO(name);
 410
 411 static ssize_t modalias_show(struct device *dev,
 412                                 struct device_attribute *attr, char *buf)
 413 {
 414         return of_device_modalias(dev, buf, PAGE_SIZE);
 415 }
 416 static DEVICE_ATTR_RO(modalias);
 417
 418 static struct attribute *ibmebus_bus_device_attrs[] = {
 419         &dev_attr_devspec.attr,
 420         &dev_attr_name.attr,
 421         &dev_attr_modalias.attr,
 422         NULL,
 423 };
 424 ATTRIBUTE_GROUPS(ibmebus_bus_device);
 425
 426 struct bus_type ibmebus_bus_type = {
 427         .name      = "ibmebus",
 428         .uevent    = of_device_uevent_modalias,
 429         .bus_groups = ibmbus_bus_groups,
 430         .match     = ibmebus_bus_bus_match,
 431         .probe     = ibmebus_bus_device_probe,
 432         .remove    = ibmebus_bus_device_remove,
 433         .shutdown  = ibmebus_bus_device_shutdown,
 434         .dev_groups = ibmebus_bus_device_groups,
 435 };
 436 EXPORT_SYMBOL(ibmebus_bus_type);
 437
 438 static int __init ibmebus_bus_init(void)
 439 {
 440         int err;
 441
 442         printk(KERN_INFO "IBM eBus Device Driver\n");
 443
 444         err = bus_register(&ibmebus_bus_type);
 445         if (err) {
 446                 printk(KERN_ERR "%s: failed to register IBM eBus.\n",
 447                        __func__);
 448                 return err;
 449         }
 450
 451         err = device_register(&ibmebus_bus_device);
 452         if (err) {
 453                 printk(KERN_WARNING "%s: device_register returned %i\n",
 454                        __func__, err);
 455                 bus_unregister(&ibmebus_bus_type);
 456
 457                 return err;
 458         }
 459
 460         err = ibmebus_create_devices(ibmebus_matches);
 461         if (err) {
 462                 device_unregister(&ibmebus_bus_device);
 463                 bus_unregister(&ibmebus_bus_type);
 464                 return err;
 465         }
 466
 467         return 0;
 468 }
 469 postcore_initcall(ibmebus_bus_init);