sound/aoa/soundbus/i2sbus/core.c

   1 /*
   2  * i2sbus driver
   3  *
   4  * Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net>
   5  *
   6  * GPL v2, can be found in COPYING.
   7  */
   8
   9 #include <linux/module.h>
  10 #include <linux/slab.h>
  11 #include <linux/pci.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/dma-mapping.h>
  14
  15 #include <sound/core.h>
  16
  17 #include <asm/macio.h>
  18 #include <asm/dbdma.h>
  19
  20 #include "../soundbus.h"
  21 #include "i2sbus.h"
  22
  23 MODULE_LICENSE("GPL");
  24 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
  25 MODULE_DESCRIPTION("Apple Soundbus: I2S support");
  26
  27 static int force;
  28 module_param(force, int, 0444);
  29 MODULE_PARM_DESC(force, "Force loading i2sbus even when"
  30                         " no layout-id property is present");
  31
  32 static struct of_device_id i2sbus_match[] = {
  33         { .name = "i2s" },
  34         { }
  35 };
  36
  37 MODULE_DEVICE_TABLE(of, i2sbus_match);
  38
  39 static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
  40                                        struct dbdma_command_mem *r,
  41                                        int numcmds)
  42 {
  43         /* one more for rounding, one for branch back, one for stop command */
  44         r->size = (numcmds + 3) * sizeof(struct dbdma_cmd);
  45         /* We use the PCI APIs for now until the generic one gets fixed
  46          * enough or until we get some macio-specific versions
  47          */
  48         r->space = dma_alloc_coherent(
  49                         &macio_get_pci_dev(i2sdev->macio)->dev,
  50                         r->size,
  51                         &r->bus_addr,
  52                         GFP_KERNEL);
  53
  54         if (!r->space) return -ENOMEM;
  55
  56         memset(r->space, 0, r->size);
  57         r->cmds = (void*)DBDMA_ALIGN(r->space);
  58         r->bus_cmd_start = r->bus_addr +
  59                            (dma_addr_t)((char*)r->cmds - (char*)r->space);
  60
  61         return 0;
  62 }
  63
  64 static void free_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
  65                                        struct dbdma_command_mem *r)
  66 {
  67         if (!r->space) return;
  68
  69         dma_free_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
  70                             r->size, r->space, r->bus_addr);
  71 }
  72
  73 static void i2sbus_release_dev(struct device *dev)
  74 {
  75         struct i2sbus_dev *i2sdev;
  76         int i;
  77
  78         i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);
  79
  80         if (i2sdev->intfregs) iounmap(i2sdev->intfregs);
  81         if (i2sdev->out.dbdma) iounmap(i2sdev->out.dbdma);
  82         if (i2sdev->in.dbdma) iounmap(i2sdev->in.dbdma);
  83         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
  84                 if (i2sdev->allocated_resource[i])
  85                         release_and_free_resource(i2sdev->allocated_resource[i]);
  86         free_dbdma_descriptor_ring(i2sdev, &i2sdev->out.dbdma_ring);
  87         free_dbdma_descriptor_ring(i2sdev, &i2sdev->in.dbdma_ring);
  88         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
  89                 free_irq(i2sdev->interrupts[i], i2sdev);
  90         i2sbus_control_remove_dev(i2sdev->control, i2sdev);
  91         mutex_destroy(&i2sdev->lock);
  92         kfree(i2sdev);
  93 }
  94
  95 static irqreturn_t i2sbus_bus_intr(int irq, void *devid)
  96 {
  97         struct i2sbus_dev *dev = devid;
  98         u32 intreg;
  99
 100         spin_lock(&dev->low_lock);
 101         intreg = in_le32(&dev->intfregs->intr_ctl);
 102
 103         /* acknowledge interrupt reasons */
 104         out_le32(&dev->intfregs->intr_ctl, intreg);
 105
 106         spin_unlock(&dev->low_lock);
 107
 108         return IRQ_HANDLED;
 109 }
 110
 111
 112 /*
 113  * XXX FIXME: We test the layout_id's here to get the proper way of
 114  * mapping in various registers, thanks to bugs in Apple device-trees.
 115  * We could instead key off the machine model and the name of the i2s
 116  * node (i2s-a). This we'll do when we move it all to macio_asic.c
 117  * and have that export items for each sub-node too.
 118  */
 119 static int i2sbus_get_and_fixup_rsrc(struct device_node *np, int index,
 120                                      int layout, struct resource *res)
 121 {
 122         struct device_node *parent;
 123         int pindex, rc = -ENXIO;
 124         const u32 *reg;
 125
 126         /* Machines with layout 76 and 36 (K2 based) have a weird device
 127          * tree what we need to special case.
 128          * Normal machines just fetch the resource from the i2s-X node.
 129          * Darwin further divides normal machines into old and new layouts
 130          * with a subtely different code path but that doesn't seem necessary
 131          * in practice, they just bloated it. In addition, even on our K2
 132          * case the i2s-modem node, if we ever want to handle it, uses the
 133          * normal layout
 134          */
 135         if (layout != 76 && layout != 36)
 136                 return of_address_to_resource(np, index, res);
 137
 138         parent = of_get_parent(np);
 139         pindex = (index == aoa_resource_i2smmio) ? 0 : 1;
 140         rc = of_address_to_resource(parent, pindex, res);
 141         if (rc)
 142                 goto bail;
 143         reg = of_get_property(np, "reg", NULL);
 144         if (reg == NULL) {
 145                 rc = -ENXIO;
 146                 goto bail;
 147         }
 148         res->start += reg[index * 2];
 149         res->end = res->start + reg[index * 2 + 1] - 1;
 150  bail:
 151         of_node_put(parent);
 152         return rc;
 153 }
 154
 155 /* FIXME: look at device node refcounting */
 156 static int i2sbus_add_dev(struct macio_dev *macio,
 157                           struct i2sbus_control *control,
 158                           struct device_node *np)
 159 {
 160         struct i2sbus_dev *dev;
 161         struct device_node *child = NULL, *sound = NULL;
 162         struct resource *r;
 163         int i, layout = 0, rlen, ok = force;
 164         static const char *rnames[] = { "i2sbus: %s (control)",
 165                                         "i2sbus: %s (tx)",
 166                                         "i2sbus: %s (rx)" };
 167         static irq_handler_t ints[] = {
 168                 i2sbus_bus_intr,
 169                 i2sbus_tx_intr,
 170                 i2sbus_rx_intr
 171         };
 172
 173         if (strlen(np->name) != 5)
 174                 return 0;
 175         if (strncmp(np->name, "i2s-", 4))
 176                 return 0;
 177
 178         dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL);
 179         if (!dev)
 180                 return 0;
 181
 182         i = 0;
 183         while ((child = of_get_next_child(np, child))) {
 184                 if (strcmp(child->name, "sound") == 0) {
 185                         i++;
 186                         sound = child;
 187                 }
 188         }
 189         if (i == 1) {
 190                 const u32 *id = of_get_property(sound, "layout-id", NULL);
 191
 192                 if (id) {
 193                         layout = *id;
 194                         snprintf(dev->sound.modalias, 32,
 195                                  "sound-layout-%d", layout);
 196                         ok = 1;
 197                 } else {
 198                         id = of_get_property(sound, "device-id", NULL);
 199                         /*
 200                          * We probably cannot handle all device-id machines,
 201                          * so restrict to those we do handle for now.
 202                          */
 203                         if (id && (*id == 22 || *id == 14 || *id == 35)) {
 204                                 snprintf(dev->sound.modalias, 32,
 205                                          "aoa-device-id-%d", *id);
 206                                 ok = 1;
 207                                 layout = -1;
 208                         }
 209                 }
 210         }
 211         /* for the time being, until we can handle non-layout-id
 212          * things in some fabric, refuse to attach if there is no
 213          * layout-id property or we haven't been forced to attach.
 214          * When there are two i2s busses and only one has a layout-id,
 215          * then this depends on the order, but that isn't important
 216          * either as the second one in that case is just a modem. */
 217         if (!ok) {
 218                 kfree(dev);
 219                 return -ENODEV;
 220         }
 221
 222         mutex_init(&dev->lock);
 223         spin_lock_init(&dev->low_lock);
 224         dev->sound.ofdev.archdata.dma_mask = macio->ofdev.archdata.dma_mask;
 225         dev->sound.ofdev.dev.of_node = np;
 226         dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.archdata.dma_mask;
 227         dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
 228         dev->sound.ofdev.dev.release = i2sbus_release_dev;
 229         dev->sound.attach_codec = i2sbus_attach_codec;
 230         dev->sound.detach_codec = i2sbus_detach_codec;
 231         dev->sound.pcmid = -1;
 232         dev->macio = macio;
 233         dev->control = control;
 234         dev->bus_number = np->name[4] - 'a';
 235         INIT_LIST_HEAD(&dev->sound.codec_list);
 236
 237         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
 238                 dev->interrupts[i] = -1;
 239                 snprintf(dev->rnames[i], sizeof(dev->rnames[i]),
 240                          rnames[i], np->name);
 241         }
 242         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
 243                 int irq = irq_of_parse_and_map(np, i);
 244                 if (request_irq(irq, ints[i], 0, dev->rnames[i], dev))
 245                         goto err;
 246                 dev->interrupts[i] = irq;
 247         }
 248
 249
 250         /* Resource handling is problematic as some device-trees contain
 251          * useless crap (ugh ugh ugh). We work around that here by calling
 252          * specific functions for calculating the appropriate resources.
 253          *
 254          * This will all be moved to macio_asic.c at one point
 255          */
 256         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
 257                 if (i2sbus_get_and_fixup_rsrc(np,i,layout,&dev->resources[i]))
 258                         goto err;
 259                 /* If only we could use our resource dev->resources[i]...
 260                  * but request_resource doesn't know about parents and
 261                  * contained resources...
 262                  */
 263                 dev->allocated_resource[i] =
 264                         request_mem_region(dev->resources[i].start,
 265                                            resource_size(&dev->resources[i]),
 266                                            dev->rnames[i]);
 267                 if (!dev->allocated_resource[i]) {
 268                         printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
 269                         goto err;
 270                 }
 271         }
 272
 273         r = &dev->resources[aoa_resource_i2smmio];
 274         rlen = resource_size(r);
 275         if (rlen < sizeof(struct i2s_interface_regs))
 276                 goto err;
 277         dev->intfregs = ioremap(r->start, rlen);
 278
 279         r = &dev->resources[aoa_resource_txdbdma];
 280         rlen = resource_size(r);
 281         if (rlen < sizeof(struct dbdma_regs))
 282                 goto err;
 283         dev->out.dbdma = ioremap(r->start, rlen);
 284
 285         r = &dev->resources[aoa_resource_rxdbdma];
 286         rlen = resource_size(r);
 287         if (rlen < sizeof(struct dbdma_regs))
 288                 goto err;
 289         dev->in.dbdma = ioremap(r->start, rlen);
 290
 291         if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
 292                 goto err;
 293
 294         if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
 295                                         MAX_DBDMA_COMMANDS))
 296                 goto err;
 297         if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
 298                                         MAX_DBDMA_COMMANDS))
 299                 goto err;
 300
 301         if (i2sbus_control_add_dev(dev->control, dev)) {
 302                 printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
 303                 goto err;
 304         }
 305
 306         if (soundbus_add_one(&dev->sound)) {
 307                 printk(KERN_DEBUG "i2sbus: device registration error!\n");
 308                 goto err;
 309         }
 310
 311         /* enable this cell */
 312         i2sbus_control_cell(dev->control, dev, 1);
 313         i2sbus_control_enable(dev->control, dev);
 314         i2sbus_control_clock(dev->control, dev, 1);
 315
 316         return 1;
 317  err:
 318         for (i=0;i<3;i++)
 319                 if (dev->interrupts[i] != -1)
 320                         free_irq(dev->interrupts[i], dev);
 321         free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
 322         free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
 323         if (dev->intfregs) iounmap(dev->intfregs);
 324         if (dev->out.dbdma) iounmap(dev->out.dbdma);
 325         if (dev->in.dbdma) iounmap(dev->in.dbdma);
 326         for (i=0;i<3;i++)
 327                 if (dev->allocated_resource[i])
 328                         release_and_free_resource(dev->allocated_resource[i]);
 329         mutex_destroy(&dev->lock);
 330         kfree(dev);
 331         return 0;
 332 }
 333
 334 static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
 335 {
 336         struct device_node *np = NULL;
 337         int got = 0, err;
 338         struct i2sbus_control *control = NULL;
 339
 340         err = i2sbus_control_init(dev, &control);
 341         if (err)
 342                 return err;
 343         if (!control) {
 344                 printk(KERN_ERR "i2sbus_control_init API breakage\n");
 345                 return -ENODEV;
 346         }
 347
 348         while ((np = of_get_next_child(dev->ofdev.dev.of_node, np))) {
 349                 if (of_device_is_compatible(np, "i2sbus") ||
 350                     of_device_is_compatible(np, "i2s-modem")) {
 351                         got += i2sbus_add_dev(dev, control, np);
 352                 }
 353         }
 354
 355         if (!got) {
 356                 /* found none, clean up */
 357                 i2sbus_control_destroy(control);
 358                 return -ENODEV;
 359         }
 360
 361         dev_set_drvdata(&dev->ofdev.dev, control);
 362
 363         return 0;
 364 }
 365
 366 static int i2sbus_remove(struct macio_dev* dev)
 367 {
 368         struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
 369         struct i2sbus_dev *i2sdev, *tmp;
 370
 371         list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
 372                 soundbus_remove_one(&i2sdev->sound);
 373
 374         return 0;
 375 }
 376
 377 #ifdef CONFIG_PM
 378 static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
 379 {
 380         struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
 381         struct codec_info_item *cii;
 382         struct i2sbus_dev* i2sdev;
 383         int err, ret = 0;
 384
 385         list_for_each_entry(i2sdev, &control->list, item) {
 386                 /* Notify Alsa */
 387                 if (i2sdev->sound.pcm) {
 388                         /* Suspend PCM streams */
 389                         snd_pcm_suspend_all(i2sdev->sound.pcm);
 390                 }
 391
 392                 /* Notify codecs */
 393                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
 394                         err = 0;
 395                         if (cii->codec->suspend)
 396                                 err = cii->codec->suspend(cii, state);
 397                         if (err)
 398                                 ret = err;
 399                 }
 400
 401                 /* wait until streams are stopped */
 402                 i2sbus_wait_for_stop_both(i2sdev);
 403         }
 404
 405         return ret;
 406 }
 407
 408 static int i2sbus_resume(struct macio_dev* dev)
 409 {
 410         struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
 411         struct codec_info_item *cii;
 412         struct i2sbus_dev* i2sdev;
 413         int err, ret = 0;
 414
 415         list_for_each_entry(i2sdev, &control->list, item) {
 416                 /* reset i2s bus format etc. */
 417                 i2sbus_pcm_prepare_both(i2sdev);
 418
 419                 /* Notify codecs so they can re-initialize */
 420                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
 421                         err = 0;
 422                         if (cii->codec->resume)
 423                                 err = cii->codec->resume(cii);
 424                         if (err)
 425                                 ret = err;
 426                 }
 427         }
 428
 429         return ret;
 430 }
 431 #endif /* CONFIG_PM */
 432
 433 static int i2sbus_shutdown(struct macio_dev* dev)
 434 {
 435         return 0;
 436 }
 437
 438 static struct macio_driver i2sbus_drv = {
 439         .driver = {
 440                 .name = "soundbus-i2s",
 441                 .owner = THIS_MODULE,
 442                 .of_match_table = i2sbus_match,
 443         },
 444         .probe = i2sbus_probe,
 445         .remove = i2sbus_remove,
 446 #ifdef CONFIG_PM
 447         .suspend = i2sbus_suspend,
 448         .resume = i2sbus_resume,
 449 #endif
 450         .shutdown = i2sbus_shutdown,
 451 };
 452
 453 static int __init soundbus_i2sbus_init(void)
 454 {
 455         return macio_register_driver(&i2sbus_drv);
 456 }
 457
 458 static void __exit soundbus_i2sbus_exit(void)
 459 {
 460         macio_unregister_driver(&i2sbus_drv);
 461 }
 462
 463 module_init(soundbus_i2sbus_init);
 464 module_exit(soundbus_i2sbus_exit);