sound/aoa/soundbus/i2sbus/i2sbus-core.c

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