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/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         return (of_find_node_by_path(data) == dn);
 156 }
 157
 158 static int ibmebus_match_node(struct device *dev, const void *data)
 159 {
 160         return to_platform_device(dev)->dev.of_node == data;
 161 }
 162
 163 static int ibmebus_create_device(struct device_node *dn)
 164 {
 165         struct platform_device *dev;
 166         int ret;
 167
 168         dev = of_device_alloc(dn, NULL, &ibmebus_bus_device);
 169         if (!dev)
 170                 return -ENOMEM;
 171
 172         dev->dev.bus = &ibmebus_bus_type;
 173         dev->dev.dma_ops = &ibmebus_dma_ops;
 174
 175         ret = of_device_add(dev);
 176         if (ret)
 177                 platform_device_put(dev);
 178         return ret;
 179 }
 180
 181 static int ibmebus_create_devices(const struct of_device_id *matches)
 182 {
 183         struct device_node *root, *child;
 184         struct device *dev;
 185         int ret = 0;
 186
 187         root = of_find_node_by_path("/");
 188
 189         for_each_child_of_node(root, child) {
 190                 if (!of_match_node(matches, child))
 191                         continue;
 192
 193                 dev = bus_find_device(&ibmebus_bus_type, NULL, child,
 194                                       ibmebus_match_node);
 195                 if (dev) {
 196                         put_device(dev);
 197                         continue;
 198                 }
 199
 200                 ret = ibmebus_create_device(child);
 201                 if (ret) {
 202                         printk(KERN_ERR "%s: failed to create device (%i)",
 203                                __func__, ret);
 204                         of_node_put(child);
 205                         break;
 206                 }
 207         }
 208
 209         of_node_put(root);
 210         return ret;
 211 }
 212
 213 int ibmebus_register_driver(struct platform_driver *drv)
 214 {
 215         /* If the driver uses devices that ibmebus doesn't know, add them */
 216         ibmebus_create_devices(drv->driver.of_match_table);
 217
 218         drv->driver.bus = &ibmebus_bus_type;
 219         return driver_register(&drv->driver);
 220 }
 221 EXPORT_SYMBOL(ibmebus_register_driver);
 222
 223 void ibmebus_unregister_driver(struct platform_driver *drv)
 224 {
 225         driver_unregister(&drv->driver);
 226 }
 227 EXPORT_SYMBOL(ibmebus_unregister_driver);
 228
 229 int ibmebus_request_irq(u32 ist, irq_handler_t handler,
 230                         unsigned long irq_flags, const char *devname,
 231                         void *dev_id)
 232 {
 233         unsigned int irq = irq_create_mapping(NULL, ist);
 234
 235         if (!irq)
 236                 return -EINVAL;
 237
 238         return request_irq(irq, handler, irq_flags, devname, dev_id);
 239 }
 240 EXPORT_SYMBOL(ibmebus_request_irq);
 241
 242 void ibmebus_free_irq(u32 ist, void *dev_id)
 243 {
 244         unsigned int irq = irq_find_mapping(NULL, ist);
 245
 246         free_irq(irq, dev_id);
 247         irq_dispose_mapping(irq);
 248 }
 249 EXPORT_SYMBOL(ibmebus_free_irq);
 250
 251 static char *ibmebus_chomp(const char *in, size_t count)
 252 {
 253         char *out = kmalloc(count + 1, GFP_KERNEL);
 254
 255         if (!out)
 256                 return NULL;
 257
 258         memcpy(out, in, count);
 259         out[count] = '\0';
 260         if (out[count - 1] == '\n')
 261                 out[count - 1] = '\0';
 262
 263         return out;
 264 }
 265
 266 static ssize_t probe_store(struct bus_type *bus, const char *buf, size_t count)
 267 {
 268         struct device_node *dn = NULL;
 269         struct device *dev;
 270         char *path;
 271         ssize_t rc = 0;
 272
 273         path = ibmebus_chomp(buf, count);
 274         if (!path)
 275                 return -ENOMEM;
 276
 277         dev = bus_find_device(&ibmebus_bus_type, NULL, path,
 278                               ibmebus_match_path);
 279         if (dev) {
 280                 put_device(dev);
 281                 printk(KERN_WARNING "%s: %s has already been probed\n",
 282                        __func__, path);
 283                 rc = -EEXIST;
 284                 goto out;
 285         }
 286
 287         if ((dn = of_find_node_by_path(path))) {
 288                 rc = ibmebus_create_device(dn);
 289                 of_node_put(dn);
 290         } else {
 291                 printk(KERN_WARNING "%s: no such device node: %s\n",
 292                        __func__, path);
 293                 rc = -ENODEV;
 294         }
 295
 296 out:
 297         kfree(path);
 298         if (rc)
 299                 return rc;
 300         return count;
 301 }
 302 static BUS_ATTR_WO(probe);
 303
 304 static ssize_t remove_store(struct bus_type *bus, 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_WO(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         get_device(dev);
 360
 361         if (of_driver_match_device(dev, dev->driver))
 362                 error = drv->probe(of_dev);
 363         if (error)
 364                 put_device(dev);
 365
 366         return error;
 367 }
 368
 369 static void 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 }
 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);