arch/powerpc/kernel/ibmebus.c

   1 /*
   2  * IBM PowerPC IBM eBus Infrastructure Support.
   3  *
   4  * Copyright (c) 2005 IBM Corporation
   5  *  Heiko J Schick <schickhj@de.ibm.com>
   6  *
   7  * All rights reserved.
   8  *
   9  * This source code is distributed under a dual license of GPL v2.0 and OpenIB
  10  * BSD.
  11  *
  12  * OpenIB BSD License
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions are met:
  16  *
  17  * Redistributions of source code must retain the above copyright notice, this
  18  * list of conditions and the following disclaimer.
  19  *
  20  * Redistributions in binary form must reproduce the above copyright notice,
  21  * this list of conditions and the following disclaimer in the documentation
  22  * and/or other materials
  23  * provided with the distribution.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  26  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  29  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  32  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  33  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  35  * POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include <linux/init.h>
  39 #include <linux/console.h>
  40 #include <linux/kobject.h>
  41 #include <linux/dma-mapping.h>
  42 #include <linux/interrupt.h>
  43 #include <asm/ibmebus.h>
  44 #include <asm/abs_addr.h>
  45
  46 static struct ibmebus_dev ibmebus_bus_device = { /* fake "parent" device */
  47         .name = ibmebus_bus_device.ofdev.dev.bus_id,
  48         .ofdev.dev.bus_id = "ibmebus",
  49         .ofdev.dev.bus    = &ibmebus_bus_type,
  50 };
  51
  52 static void *ibmebus_alloc_coherent(struct device *dev,
  53                                     size_t size,
  54                                     dma_addr_t *dma_handle,
  55                                     gfp_t flag)
  56 {
  57         void *mem;
  58
  59         mem = kmalloc(size, flag);
  60         *dma_handle = (dma_addr_t)mem;
  61
  62         return mem;
  63 }
  64
  65 static void ibmebus_free_coherent(struct device *dev,
  66                                   size_t size, void *vaddr,
  67                                   dma_addr_t dma_handle)
  68 {
  69         kfree(vaddr);
  70 }
  71
  72 static dma_addr_t ibmebus_map_single(struct device *dev,
  73                                      void *ptr,
  74                                      size_t size,
  75                                      enum dma_data_direction direction)
  76 {
  77         return (dma_addr_t)(ptr);
  78 }
  79
  80 static void ibmebus_unmap_single(struct device *dev,
  81                                  dma_addr_t dma_addr,
  82                                  size_t size,
  83                                  enum dma_data_direction direction)
  84 {
  85         return;
  86 }
  87
  88 static int ibmebus_map_sg(struct device *dev,
  89                           struct scatterlist *sg,
  90                           int nents, enum dma_data_direction direction)
  91 {
  92         int i;
  93
  94         for (i = 0; i < nents; i++) {
  95                 sg[i].dma_address = (dma_addr_t)page_address(sg[i].page)
  96                         + sg[i].offset;
  97                 sg[i].dma_length = sg[i].length;
  98         }
  99
 100         return nents;
 101 }
 102
 103 static void ibmebus_unmap_sg(struct device *dev,
 104                              struct scatterlist *sg,
 105                              int nents, enum dma_data_direction direction)
 106 {
 107         return;
 108 }
 109
 110 static int ibmebus_dma_supported(struct device *dev, u64 mask)
 111 {
 112         return 1;
 113 }
 114
 115 struct dma_mapping_ops ibmebus_dma_ops = {
 116         .alloc_coherent = ibmebus_alloc_coherent,
 117         .free_coherent  = ibmebus_free_coherent,
 118         .map_single     = ibmebus_map_single,
 119         .unmap_single   = ibmebus_unmap_single,
 120         .map_sg         = ibmebus_map_sg,
 121         .unmap_sg       = ibmebus_unmap_sg,
 122         .dma_supported  = ibmebus_dma_supported,
 123 };
 124
 125 static int ibmebus_bus_probe(struct device *dev)
 126 {
 127         struct ibmebus_dev *ibmebusdev    = to_ibmebus_dev(dev);
 128         struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
 129         const struct of_device_id *id;
 130         int error = -ENODEV;
 131
 132         if (!ibmebusdrv->probe)
 133                 return error;
 134
 135         id = of_match_device(ibmebusdrv->id_table, &ibmebusdev->ofdev);
 136         if (id) {
 137                 error = ibmebusdrv->probe(ibmebusdev, id);
 138         }
 139
 140         return error;
 141 }
 142
 143 static int ibmebus_bus_remove(struct device *dev)
 144 {
 145         struct ibmebus_dev *ibmebusdev    = to_ibmebus_dev(dev);
 146         struct ibmebus_driver *ibmebusdrv = to_ibmebus_driver(dev->driver);
 147
 148         if (ibmebusdrv->remove) {
 149                 return ibmebusdrv->remove(ibmebusdev);
 150         }
 151
 152         return 0;
 153 }
 154
 155 static void __devinit ibmebus_dev_release(struct device *dev)
 156 {
 157         of_node_put(to_ibmebus_dev(dev)->ofdev.node);
 158         kfree(to_ibmebus_dev(dev));
 159 }
 160
 161 static ssize_t ibmebusdev_show_name(struct device *dev,
 162                                     struct device_attribute *attr, char *buf)
 163 {
 164         return sprintf(buf, "%s\n", to_ibmebus_dev(dev)->name);
 165 }
 166 static DEVICE_ATTR(name, S_IRUSR | S_IRGRP | S_IROTH, ibmebusdev_show_name,
 167                    NULL);
 168
 169 static struct ibmebus_dev* __devinit ibmebus_register_device_common(
 170         struct ibmebus_dev *dev, char *name)
 171 {
 172         int err = 0;
 173
 174         dev->name = name;
 175         dev->ofdev.dev.parent  = &ibmebus_bus_device.ofdev.dev;
 176         dev->ofdev.dev.bus     = &ibmebus_bus_type;
 177         dev->ofdev.dev.release = ibmebus_dev_release;
 178
 179         /* An ibmebusdev is based on a of_device. We have to change the
 180          * bus type to use our own DMA mapping operations.
 181          */
 182         if ((err = of_device_register(&dev->ofdev)) != 0) {
 183                 printk(KERN_ERR "%s: failed to register device (%d).\n",
 184                        __FUNCTION__, err);
 185                 return NULL;
 186         }
 187
 188         device_create_file(&dev->ofdev.dev, &dev_attr_name);
 189
 190         return dev;
 191 }
 192
 193 static struct ibmebus_dev* __devinit ibmebus_register_device_node(
 194         struct device_node *dn)
 195 {
 196         struct ibmebus_dev *dev;
 197         char *loc_code;
 198         int length;
 199
 200         loc_code = (char *)get_property(dn, "ibm,loc-code", NULL);
 201         if (!loc_code) {
 202                 printk(KERN_WARNING "%s: node %s missing 'ibm,loc-code'\n",
 203                        __FUNCTION__, dn->name ? dn->name : "<unknown>");
 204                 return NULL;
 205         }
 206
 207         if (strlen(loc_code) == 0) {
 208                 printk(KERN_WARNING "%s: 'ibm,loc-code' is invalid\n",
 209                        __FUNCTION__);
 210                 return NULL;
 211         }
 212
 213         dev = kmalloc(sizeof(struct ibmebus_dev), GFP_KERNEL);
 214         if (!dev) {
 215                 return NULL;
 216         }
 217         memset(dev, 0, sizeof(struct ibmebus_dev));
 218
 219         dev->ofdev.node = of_node_get(dn);
 220
 221         length = strlen(loc_code);
 222         memcpy(dev->ofdev.dev.bus_id, loc_code
 223                 + (length - min(length, BUS_ID_SIZE - 1)),
 224                 min(length, BUS_ID_SIZE - 1));
 225
 226         /* Register with generic device framework. */
 227         if (ibmebus_register_device_common(dev, dn->name) == NULL) {
 228                 kfree(dev);
 229                 return NULL;
 230         }
 231
 232         return dev;
 233 }
 234
 235 static void ibmebus_probe_of_nodes(char* name)
 236 {
 237         struct device_node *dn = NULL;
 238
 239         while ((dn = of_find_node_by_name(dn, name))) {
 240                 if (ibmebus_register_device_node(dn) == NULL) {
 241                         of_node_put(dn);
 242
 243                         return;
 244                 }
 245         }
 246
 247         of_node_put(dn);
 248
 249         return;
 250 }
 251
 252 static void ibmebus_add_devices_by_id(struct of_device_id *idt)
 253 {
 254         while (strlen(idt->name) > 0) {
 255                 ibmebus_probe_of_nodes(idt->name);
 256                 idt++;
 257         }
 258
 259         return;
 260 }
 261
 262 static int ibmebus_match_helper(struct device *dev, void *data)
 263 {
 264         if (strcmp((char*)data, to_ibmebus_dev(dev)->name) == 0)
 265                 return 1;
 266
 267         return 0;
 268 }
 269
 270 static int ibmebus_unregister_device(struct device *dev)
 271 {
 272         device_remove_file(dev, &dev_attr_name);
 273         of_device_unregister(to_of_device(dev));
 274
 275         return 0;
 276 }
 277
 278 static void ibmebus_remove_devices_by_id(struct of_device_id *idt)
 279 {
 280         struct device *dev;
 281
 282         while (strlen(idt->name) > 0) {
 283                 while ((dev = bus_find_device(&ibmebus_bus_type, NULL,
 284                                               (void*)idt->name,
 285                                               ibmebus_match_helper))) {
 286                         ibmebus_unregister_device(dev);
 287                 }
 288                 idt++;
 289
 290         }
 291
 292         return;
 293 }
 294
 295 int ibmebus_register_driver(struct ibmebus_driver *drv)
 296 {
 297         int err = 0;
 298
 299         drv->driver.name   = drv->name;
 300         drv->driver.bus    = &ibmebus_bus_type;
 301         drv->driver.probe  = ibmebus_bus_probe;
 302         drv->driver.remove = ibmebus_bus_remove;
 303
 304         if ((err = driver_register(&drv->driver) != 0))
 305                 return err;
 306
 307         ibmebus_add_devices_by_id(drv->id_table);
 308
 309         return 0;
 310 }
 311 EXPORT_SYMBOL(ibmebus_register_driver);
 312
 313 void ibmebus_unregister_driver(struct ibmebus_driver *drv)
 314 {
 315         driver_unregister(&drv->driver);
 316         ibmebus_remove_devices_by_id(drv->id_table);
 317 }
 318 EXPORT_SYMBOL(ibmebus_unregister_driver);
 319
 320 int ibmebus_request_irq(struct ibmebus_dev *dev,
 321                         u32 ist,
 322                         irqreturn_t (*handler)(int, void*, struct pt_regs *),
 323                         unsigned long irq_flags, const char * devname,
 324                         void *dev_id)
 325 {
 326         unsigned int irq = irq_create_mapping(NULL, ist, 0);
 327
 328         if (irq == NO_IRQ)
 329                 return -EINVAL;
 330
 331         return request_irq(irq, handler,
 332                            irq_flags, devname, dev_id);
 333 }
 334 EXPORT_SYMBOL(ibmebus_request_irq);
 335
 336 void ibmebus_free_irq(struct ibmebus_dev *dev, u32 ist, void *dev_id)
 337 {
 338         unsigned int irq = irq_find_mapping(NULL, ist);
 339
 340         free_irq(irq, dev_id);
 341 }
 342 EXPORT_SYMBOL(ibmebus_free_irq);
 343
 344 static int ibmebus_bus_match(struct device *dev, struct device_driver *drv)
 345 {
 346         const struct ibmebus_dev *ebus_dev = to_ibmebus_dev(dev);
 347         struct ibmebus_driver *ebus_drv    = to_ibmebus_driver(drv);
 348         const struct of_device_id *ids     = ebus_drv->id_table;
 349         const struct of_device_id *found_id;
 350
 351         if (!ids)
 352                 return 0;
 353
 354         found_id = of_match_device(ids, &ebus_dev->ofdev);
 355         if (found_id)
 356                 return 1;
 357
 358         return 0;
 359 }
 360
 361 struct bus_type ibmebus_bus_type = {
 362         .name = "ibmebus",
 363         .match = ibmebus_bus_match,
 364 };
 365 EXPORT_SYMBOL(ibmebus_bus_type);
 366
 367 static int __init ibmebus_bus_init(void)
 368 {
 369         int err;
 370
 371         printk(KERN_INFO "IBM eBus Device Driver\n");
 372
 373         err = bus_register(&ibmebus_bus_type);
 374         if (err) {
 375                 printk(KERN_ERR ":%s: failed to register IBM eBus.\n",
 376                        __FUNCTION__);
 377                 return err;
 378         }
 379
 380         err = device_register(&ibmebus_bus_device.ofdev.dev);
 381         if (err) {
 382                 printk(KERN_WARNING "%s: device_register returned %i\n",
 383                        __FUNCTION__, err);
 384                 bus_unregister(&ibmebus_bus_type);
 385
 386                 return err;
 387         }
 388
 389         return 0;
 390 }
 391 __initcall(ibmebus_bus_init);