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-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);