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

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  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                                    *id == 44)) {
205                                 snprintf(dev->sound.modalias, 32,
206                                          "aoa-device-id-%d", *id);
207                                 ok = 1;
208                                 layout = -1;
209                         }
210                 }
211         }
212         /* for the time being, until we can handle non-layout-id
213          * things in some fabric, refuse to attach if there is no
214          * layout-id property or we haven't been forced to attach.
215          * When there are two i2s busses and only one has a layout-id,
216          * then this depends on the order, but that isn't important
217          * either as the second one in that case is just a modem. */
218         if (!ok) {
219                 kfree(dev);
220                 return -ENODEV;
221         }
222 
223         mutex_init(&dev->lock);
224         spin_lock_init(&dev->low_lock);
225         dev->sound.ofdev.archdata.dma_mask = macio->ofdev.archdata.dma_mask;
226         dev->sound.ofdev.dev.of_node = np;
227         dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.archdata.dma_mask;
228         dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
229         dev->sound.ofdev.dev.release = i2sbus_release_dev;
230         dev->sound.attach_codec = i2sbus_attach_codec;
231         dev->sound.detach_codec = i2sbus_detach_codec;
232         dev->sound.pcmid = -1;
233         dev->macio = macio;
234         dev->control = control;
235         dev->bus_number = np->name[4] - 'a';
236         INIT_LIST_HEAD(&dev->sound.codec_list);
237 
238         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
239                 dev->interrupts[i] = -1;
240                 snprintf(dev->rnames[i], sizeof(dev->rnames[i]),
241                          rnames[i], np->name);
242         }
243         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
244                 int irq = irq_of_parse_and_map(np, i);
245                 if (request_irq(irq, ints[i], 0, dev->rnames[i], dev))
246                         goto err;
247                 dev->interrupts[i] = irq;
248         }
249 
250 
251         /* Resource handling is problematic as some device-trees contain
252          * useless crap (ugh ugh ugh). We work around that here by calling
253          * specific functions for calculating the appropriate resources.
254          *
255          * This will all be moved to macio_asic.c at one point
256          */
257         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
258                 if (i2sbus_get_and_fixup_rsrc(np,i,layout,&dev->resources[i]))
259                         goto err;
260                 /* If only we could use our resource dev->resources[i]...
261                  * but request_resource doesn't know about parents and
262                  * contained resources...
263                  */
264                 dev->allocated_resource[i] =
265                         request_mem_region(dev->resources[i].start,
266                                            resource_size(&dev->resources[i]),
267                                            dev->rnames[i]);
268                 if (!dev->allocated_resource[i]) {
269                         printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
270                         goto err;
271                 }
272         }
273 
274         r = &dev->resources[aoa_resource_i2smmio];
275         rlen = resource_size(r);
276         if (rlen < sizeof(struct i2s_interface_regs))
277                 goto err;
278         dev->intfregs = ioremap(r->start, rlen);
279 
280         r = &dev->resources[aoa_resource_txdbdma];
281         rlen = resource_size(r);
282         if (rlen < sizeof(struct dbdma_regs))
283                 goto err;
284         dev->out.dbdma = ioremap(r->start, rlen);
285 
286         r = &dev->resources[aoa_resource_rxdbdma];
287         rlen = resource_size(r);
288         if (rlen < sizeof(struct dbdma_regs))
289                 goto err;
290         dev->in.dbdma = ioremap(r->start, rlen);
291 
292         if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
293                 goto err;
294 
295         if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
296                                         MAX_DBDMA_COMMANDS))
297                 goto err;
298         if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
299                                         MAX_DBDMA_COMMANDS))
300                 goto err;
301 
302         if (i2sbus_control_add_dev(dev->control, dev)) {
303                 printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
304                 goto err;
305         }
306 
307         if (soundbus_add_one(&dev->sound)) {
308                 printk(KERN_DEBUG "i2sbus: device registration error!\n");
309                 goto err;
310         }
311 
312         /* enable this cell */
313         i2sbus_control_cell(dev->control, dev, 1);
314         i2sbus_control_enable(dev->control, dev);
315         i2sbus_control_clock(dev->control, dev, 1);
316 
317         return 1;
318  err:
319         for (i=0;i<3;i++)
320                 if (dev->interrupts[i] != -1)
321                         free_irq(dev->interrupts[i], dev);
322         free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
323         free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
324         if (dev->intfregs) iounmap(dev->intfregs);
325         if (dev->out.dbdma) iounmap(dev->out.dbdma);
326         if (dev->in.dbdma) iounmap(dev->in.dbdma);
327         for (i=0;i<3;i++)
328                 if (dev->allocated_resource[i])
329                         release_and_free_resource(dev->allocated_resource[i]);
330         mutex_destroy(&dev->lock);
331         kfree(dev);
332         return 0;
333 }
334 
335 static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
336 {
337         struct device_node *np = NULL;
338         int got = 0, err;
339         struct i2sbus_control *control = NULL;
340 
341         err = i2sbus_control_init(dev, &control);
342         if (err)
343                 return err;
344         if (!control) {
345                 printk(KERN_ERR "i2sbus_control_init API breakage\n");
346                 return -ENODEV;
347         }
348 
349         while ((np = of_get_next_child(dev->ofdev.dev.of_node, np))) {
350                 if (of_device_is_compatible(np, "i2sbus") ||
351                     of_device_is_compatible(np, "i2s-modem")) {
352                         got += i2sbus_add_dev(dev, control, np);
353                 }
354         }
355 
356         if (!got) {
357                 /* found none, clean up */
358                 i2sbus_control_destroy(control);
359                 return -ENODEV;
360         }
361 
362         dev_set_drvdata(&dev->ofdev.dev, control);
363 
364         return 0;
365 }
366 
367 static int i2sbus_remove(struct macio_dev* dev)
368 {
369         struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
370         struct i2sbus_dev *i2sdev, *tmp;
371 
372         list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
373                 soundbus_remove_one(&i2sdev->sound);
374 
375         return 0;
376 }
377 
378 #ifdef CONFIG_PM
379 static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
380 {
381         struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
382         struct codec_info_item *cii;
383         struct i2sbus_dev* i2sdev;
384         int err, ret = 0;
385 
386         list_for_each_entry(i2sdev, &control->list, item) {
387                 /* Notify Alsa */
388                 if (i2sdev->sound.pcm) {
389                         /* Suspend PCM streams */
390                         snd_pcm_suspend_all(i2sdev->sound.pcm);
391                 }
392 
393                 /* Notify codecs */
394                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
395                         err = 0;
396                         if (cii->codec->suspend)
397                                 err = cii->codec->suspend(cii, state);
398                         if (err)
399                                 ret = err;
400                 }
401 
402                 /* wait until streams are stopped */
403                 i2sbus_wait_for_stop_both(i2sdev);
404         }
405 
406         return ret;
407 }
408 
409 static int i2sbus_resume(struct macio_dev* dev)
410 {
411         struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
412         struct codec_info_item *cii;
413         struct i2sbus_dev* i2sdev;
414         int err, ret = 0;
415 
416         list_for_each_entry(i2sdev, &control->list, item) {
417                 /* reset i2s bus format etc. */
418                 i2sbus_pcm_prepare_both(i2sdev);
419 
420                 /* Notify codecs so they can re-initialize */
421                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
422                         err = 0;
423                         if (cii->codec->resume)
424                                 err = cii->codec->resume(cii);
425                         if (err)
426                                 ret = err;
427                 }
428         }
429 
430         return ret;
431 }
432 #endif /* CONFIG_PM */
433 
434 static int i2sbus_shutdown(struct macio_dev* dev)
435 {
436         return 0;
437 }
438 
439 static struct macio_driver i2sbus_drv = {
440         .driver = {
441                 .name = "soundbus-i2s",
442                 .owner = THIS_MODULE,
443                 .of_match_table = i2sbus_match,
444         },
445         .probe = i2sbus_probe,
446         .remove = i2sbus_remove,
447 #ifdef CONFIG_PM
448         .suspend = i2sbus_suspend,
449         .resume = i2sbus_resume,
450 #endif
451         .shutdown = i2sbus_shutdown,
452 };
453 
454 static int __init soundbus_i2sbus_init(void)
455 {
456         return macio_register_driver(&i2sbus_drv);
457 }
458 
459 static void __exit soundbus_i2sbus_exit(void)
460 {
461         macio_unregister_driver(&i2sbus_drv);
462 }
463 
464 module_init(soundbus_i2sbus_init);
465 module_exit(soundbus_i2sbus_exit);
466 

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