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

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