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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_alloc_coherent(
 51                         &macio_get_pci_dev(i2sdev->macio)->dev,
 52                         r->size,
 53                         &r->bus_addr,
 54                         GFP_KERNEL);
 55 
 56         if (!r->space) return -ENOMEM;
 57 
 58         memset(r->space, 0, r->size);
 59         r->cmds = (void*)DBDMA_ALIGN(r->space);
 60         r->bus_cmd_start = r->bus_addr +
 61                            (dma_addr_t)((char*)r->cmds - (char*)r->space);
 62 
 63         return 0;
 64 }
 65 
 66 static void free_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
 67                                        struct dbdma_command_mem *r)
 68 {
 69         if (!r->space) return;
 70 
 71         dma_free_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
 72                             r->size, r->space, r->bus_addr);
 73 }
 74 
 75 static void i2sbus_release_dev(struct device *dev)
 76 {
 77         struct i2sbus_dev *i2sdev;
 78         int i;
 79 
 80         i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);
 81 
 82         if (i2sdev->intfregs) iounmap(i2sdev->intfregs);
 83         if (i2sdev->out.dbdma) iounmap(i2sdev->out.dbdma);
 84         if (i2sdev->in.dbdma) iounmap(i2sdev->in.dbdma);
 85         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
 86                 if (i2sdev->allocated_resource[i])
 87                         release_and_free_resource(i2sdev->allocated_resource[i]);
 88         free_dbdma_descriptor_ring(i2sdev, &i2sdev->out.dbdma_ring);
 89         free_dbdma_descriptor_ring(i2sdev, &i2sdev->in.dbdma_ring);
 90         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++)
 91                 free_irq(i2sdev->interrupts[i], i2sdev);
 92         i2sbus_control_remove_dev(i2sdev->control, i2sdev);
 93         mutex_destroy(&i2sdev->lock);
 94         kfree(i2sdev);
 95 }
 96 
 97 static irqreturn_t i2sbus_bus_intr(int irq, void *devid)
 98 {
 99         struct i2sbus_dev *dev = devid;
100         u32 intreg;
101 
102         spin_lock(&dev->low_lock);
103         intreg = in_le32(&dev->intfregs->intr_ctl);
104 
105         /* acknowledge interrupt reasons */
106         out_le32(&dev->intfregs->intr_ctl, intreg);
107 
108         spin_unlock(&dev->low_lock);
109 
110         return IRQ_HANDLED;
111 }
112 
113 
114 /*
115  * XXX FIXME: We test the layout_id's here to get the proper way of
116  * mapping in various registers, thanks to bugs in Apple device-trees.
117  * We could instead key off the machine model and the name of the i2s
118  * node (i2s-a). This we'll do when we move it all to macio_asic.c
119  * and have that export items for each sub-node too.
120  */
121 static int i2sbus_get_and_fixup_rsrc(struct device_node *np, int index,
122                                      int layout, struct resource *res)
123 {
124         struct device_node *parent;
125         int pindex, rc = -ENXIO;
126         const u32 *reg;
127 
128         /* Machines with layout 76 and 36 (K2 based) have a weird device
129          * tree what we need to special case.
130          * Normal machines just fetch the resource from the i2s-X node.
131          * Darwin further divides normal machines into old and new layouts
132          * with a subtely different code path but that doesn't seem necessary
133          * in practice, they just bloated it. In addition, even on our K2
134          * case the i2s-modem node, if we ever want to handle it, uses the
135          * normal layout
136          */
137         if (layout != 76 && layout != 36)
138                 return of_address_to_resource(np, index, res);
139 
140         parent = of_get_parent(np);
141         pindex = (index == aoa_resource_i2smmio) ? 0 : 1;
142         rc = of_address_to_resource(parent, pindex, res);
143         if (rc)
144                 goto bail;
145         reg = of_get_property(np, "reg", NULL);
146         if (reg == NULL) {
147                 rc = -ENXIO;
148                 goto bail;
149         }
150         res->start += reg[index * 2];
151         res->end = res->start + reg[index * 2 + 1] - 1;
152  bail:
153         of_node_put(parent);
154         return rc;
155 }
156 
157 /* FIXME: look at device node refcounting */
158 static int i2sbus_add_dev(struct macio_dev *macio,
159                           struct i2sbus_control *control,
160                           struct device_node *np)
161 {
162         struct i2sbus_dev *dev;
163         struct device_node *child = NULL, *sound = NULL;
164         struct resource *r;
165         int i, layout = 0, rlen, ok = force;
166         static const char *rnames[] = { "i2sbus: %s (control)",
167                                         "i2sbus: %s (tx)",
168                                         "i2sbus: %s (rx)" };
169         static irq_handler_t ints[] = {
170                 i2sbus_bus_intr,
171                 i2sbus_tx_intr,
172                 i2sbus_rx_intr
173         };
174 
175         if (strlen(np->name) != 5)
176                 return 0;
177         if (strncmp(np->name, "i2s-", 4))
178                 return 0;
179 
180         dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL);
181         if (!dev)
182                 return 0;
183 
184         i = 0;
185         while ((child = of_get_next_child(np, child))) {
186                 if (strcmp(child->name, "sound") == 0) {
187                         i++;
188                         sound = child;
189                 }
190         }
191         if (i == 1) {
192                 const u32 *id = of_get_property(sound, "layout-id", NULL);
193 
194                 if (id) {
195                         layout = *id;
196                         snprintf(dev->sound.modalias, 32,
197                                  "sound-layout-%d", layout);
198                         ok = 1;
199                 } else {
200                         id = of_get_property(sound, "device-id", NULL);
201                         /*
202                          * We probably cannot handle all device-id machines,
203                          * so restrict to those we do handle for now.
204                          */
205                         if (id && (*id == 22 || *id == 14 || *id == 35 ||
206                                    *id == 44)) {
207                                 snprintf(dev->sound.modalias, 32,
208                                          "aoa-device-id-%d", *id);
209                                 ok = 1;
210                                 layout = -1;
211                         }
212                 }
213         }
214         /* for the time being, until we can handle non-layout-id
215          * things in some fabric, refuse to attach if there is no
216          * layout-id property or we haven't been forced to attach.
217          * When there are two i2s busses and only one has a layout-id,
218          * then this depends on the order, but that isn't important
219          * either as the second one in that case is just a modem. */
220         if (!ok) {
221                 kfree(dev);
222                 return -ENODEV;
223         }
224 
225         mutex_init(&dev->lock);
226         spin_lock_init(&dev->low_lock);
227         dev->sound.ofdev.archdata.dma_mask = macio->ofdev.archdata.dma_mask;
228         dev->sound.ofdev.dev.of_node = np;
229         dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.archdata.dma_mask;
230         dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
231         dev->sound.ofdev.dev.release = i2sbus_release_dev;
232         dev->sound.attach_codec = i2sbus_attach_codec;
233         dev->sound.detach_codec = i2sbus_detach_codec;
234         dev->sound.pcmid = -1;
235         dev->macio = macio;
236         dev->control = control;
237         dev->bus_number = np->name[4] - 'a';
238         INIT_LIST_HEAD(&dev->sound.codec_list);
239 
240         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
241                 dev->interrupts[i] = -1;
242                 snprintf(dev->rnames[i], sizeof(dev->rnames[i]),
243                          rnames[i], np->name);
244         }
245         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
246                 int irq = irq_of_parse_and_map(np, i);
247                 if (request_irq(irq, ints[i], 0, dev->rnames[i], dev))
248                         goto err;
249                 dev->interrupts[i] = irq;
250         }
251 
252 
253         /* Resource handling is problematic as some device-trees contain
254          * useless crap (ugh ugh ugh). We work around that here by calling
255          * specific functions for calculating the appropriate resources.
256          *
257          * This will all be moved to macio_asic.c at one point
258          */
259         for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
260                 if (i2sbus_get_and_fixup_rsrc(np,i,layout,&dev->resources[i]))
261                         goto err;
262                 /* If only we could use our resource dev->resources[i]...
263                  * but request_resource doesn't know about parents and
264                  * contained resources...
265                  */
266                 dev->allocated_resource[i] =
267                         request_mem_region(dev->resources[i].start,
268                                            resource_size(&dev->resources[i]),
269                                            dev->rnames[i]);
270                 if (!dev->allocated_resource[i]) {
271                         printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
272                         goto err;
273                 }
274         }
275 
276         r = &dev->resources[aoa_resource_i2smmio];
277         rlen = resource_size(r);
278         if (rlen < sizeof(struct i2s_interface_regs))
279                 goto err;
280         dev->intfregs = ioremap(r->start, rlen);
281 
282         r = &dev->resources[aoa_resource_txdbdma];
283         rlen = resource_size(r);
284         if (rlen < sizeof(struct dbdma_regs))
285                 goto err;
286         dev->out.dbdma = ioremap(r->start, rlen);
287 
288         r = &dev->resources[aoa_resource_rxdbdma];
289         rlen = resource_size(r);
290         if (rlen < sizeof(struct dbdma_regs))
291                 goto err;
292         dev->in.dbdma = ioremap(r->start, rlen);
293 
294         if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
295                 goto err;
296 
297         if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
298                                         MAX_DBDMA_COMMANDS))
299                 goto err;
300         if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
301                                         MAX_DBDMA_COMMANDS))
302                 goto err;
303 
304         if (i2sbus_control_add_dev(dev->control, dev)) {
305                 printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
306                 goto err;
307         }
308 
309         if (soundbus_add_one(&dev->sound)) {
310                 printk(KERN_DEBUG "i2sbus: device registration error!\n");
311                 goto err;
312         }
313 
314         /* enable this cell */
315         i2sbus_control_cell(dev->control, dev, 1);
316         i2sbus_control_enable(dev->control, dev);
317         i2sbus_control_clock(dev->control, dev, 1);
318 
319         return 1;
320  err:
321         for (i=0;i<3;i++)
322                 if (dev->interrupts[i] != -1)
323                         free_irq(dev->interrupts[i], dev);
324         free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
325         free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
326         if (dev->intfregs) iounmap(dev->intfregs);
327         if (dev->out.dbdma) iounmap(dev->out.dbdma);
328         if (dev->in.dbdma) iounmap(dev->in.dbdma);
329         for (i=0;i<3;i++)
330                 if (dev->allocated_resource[i])
331                         release_and_free_resource(dev->allocated_resource[i]);
332         mutex_destroy(&dev->lock);
333         kfree(dev);
334         return 0;
335 }
336 
337 static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
338 {
339         struct device_node *np = NULL;
340         int got = 0, err;
341         struct i2sbus_control *control = NULL;
342 
343         err = i2sbus_control_init(dev, &control);
344         if (err)
345                 return err;
346         if (!control) {
347                 printk(KERN_ERR "i2sbus_control_init API breakage\n");
348                 return -ENODEV;
349         }
350 
351         while ((np = of_get_next_child(dev->ofdev.dev.of_node, np))) {
352                 if (of_device_is_compatible(np, "i2sbus") ||
353                     of_device_is_compatible(np, "i2s-modem")) {
354                         got += i2sbus_add_dev(dev, control, np);
355                 }
356         }
357 
358         if (!got) {
359                 /* found none, clean up */
360                 i2sbus_control_destroy(control);
361                 return -ENODEV;
362         }
363 
364         dev_set_drvdata(&dev->ofdev.dev, control);
365 
366         return 0;
367 }
368 
369 static int i2sbus_remove(struct macio_dev* dev)
370 {
371         struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
372         struct i2sbus_dev *i2sdev, *tmp;
373 
374         list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
375                 soundbus_remove_one(&i2sdev->sound);
376 
377         return 0;
378 }
379 
380 #ifdef CONFIG_PM
381 static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
382 {
383         struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
384         struct codec_info_item *cii;
385         struct i2sbus_dev* i2sdev;
386         int err, ret = 0;
387 
388         list_for_each_entry(i2sdev, &control->list, item) {
389                 /* Notify Alsa */
390                 if (i2sdev->sound.pcm) {
391                         /* Suspend PCM streams */
392                         snd_pcm_suspend_all(i2sdev->sound.pcm);
393                 }
394 
395                 /* Notify codecs */
396                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
397                         err = 0;
398                         if (cii->codec->suspend)
399                                 err = cii->codec->suspend(cii, state);
400                         if (err)
401                                 ret = err;
402                 }
403 
404                 /* wait until streams are stopped */
405                 i2sbus_wait_for_stop_both(i2sdev);
406         }
407 
408         return ret;
409 }
410 
411 static int i2sbus_resume(struct macio_dev* dev)
412 {
413         struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
414         struct codec_info_item *cii;
415         struct i2sbus_dev* i2sdev;
416         int err, ret = 0;
417 
418         list_for_each_entry(i2sdev, &control->list, item) {
419                 /* reset i2s bus format etc. */
420                 i2sbus_pcm_prepare_both(i2sdev);
421 
422                 /* Notify codecs so they can re-initialize */
423                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
424                         err = 0;
425                         if (cii->codec->resume)
426                                 err = cii->codec->resume(cii);
427                         if (err)
428                                 ret = err;
429                 }
430         }
431 
432         return ret;
433 }
434 #endif /* CONFIG_PM */
435 
436 static int i2sbus_shutdown(struct macio_dev* dev)
437 {
438         return 0;
439 }
440 
441 static struct macio_driver i2sbus_drv = {
442         .driver = {
443                 .name = "soundbus-i2s",
444                 .owner = THIS_MODULE,
445                 .of_match_table = i2sbus_match,
446         },
447         .probe = i2sbus_probe,
448         .remove = i2sbus_remove,
449 #ifdef CONFIG_PM
450         .suspend = i2sbus_suspend,
451         .resume = i2sbus_resume,
452 #endif
453         .shutdown = i2sbus_shutdown,
454 };
455 
456 static int __init soundbus_i2sbus_init(void)
457 {
458         return macio_register_driver(&i2sbus_drv);
459 }
460 
461 static void __exit soundbus_i2sbus_exit(void)
462 {
463         macio_unregister_driver(&i2sbus_drv);
464 }
465 
466 module_init(soundbus_i2sbus_init);
467 module_exit(soundbus_i2sbus_exit);
468 

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