4 * Copyright 2006-2008 Johannes Berg <johannes@sipsolutions.net>
6 * GPL v2, can be found in COPYING.
9 #include <linux/module.h>
10 #include <linux/pci.h>
11 #include <linux/interrupt.h>
12 #include <linux/dma-mapping.h>
14 #include <sound/core.h>
16 #include <asm/macio.h>
17 #include <asm/dbdma.h>
19 #include "../soundbus.h"
22 MODULE_LICENSE("GPL");
23 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
24 MODULE_DESCRIPTION("Apple Soundbus: I2S support");
27 module_param(force, int, 0444);
28 MODULE_PARM_DESC(force, "Force loading i2sbus even when"
29 " no layout-id property is present");
31 static struct of_device_id i2sbus_match[] = {
36 MODULE_DEVICE_TABLE(of, i2sbus_match);
38 static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
39 struct dbdma_command_mem *r,
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
47 r->space = dma_alloc_coherent(
48 &macio_get_pci_dev(i2sdev->macio)->dev,
53 if (!r->space) return -ENOMEM;
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);
63 static void free_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
64 struct dbdma_command_mem *r)
66 if (!r->space) return;
68 dma_free_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
69 r->size, r->space, r->bus_addr);
72 static void i2sbus_release_dev(struct device *dev)
74 struct i2sbus_dev *i2sdev;
77 i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);
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);
94 static irqreturn_t i2sbus_bus_intr(int irq, void *devid)
96 struct i2sbus_dev *dev = devid;
99 spin_lock(&dev->low_lock);
100 intreg = in_le32(&dev->intfregs->intr_ctl);
102 /* acknowledge interrupt reasons */
103 out_le32(&dev->intfregs->intr_ctl, intreg);
105 spin_unlock(&dev->low_lock);
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.
118 static int i2sbus_get_and_fixup_rsrc(struct device_node *np, int index,
119 int layout, struct resource *res)
121 struct device_node *parent;
122 int pindex, rc = -ENXIO;
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
134 if (layout != 76 && layout != 36)
135 return of_address_to_resource(np, index, res);
137 parent = of_get_parent(np);
138 pindex = (index == aoa_resource_i2smmio) ? 0 : 1;
139 rc = of_address_to_resource(parent, pindex, res);
142 reg = of_get_property(np, "reg", NULL);
147 res->start += reg[index * 2];
148 res->end = res->start + reg[index * 2 + 1] - 1;
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)
159 struct i2sbus_dev *dev;
160 struct device_node *child = NULL, *sound = NULL;
162 int i, layout = 0, rlen, ok = force;
163 static const char *rnames[] = { "i2sbus: %s (control)",
166 static irq_handler_t ints[] = {
172 if (strlen(np->name) != 5)
174 if (strncmp(np->name, "i2s-", 4))
177 dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL);
182 while ((child = of_get_next_child(np, child))) {
183 if (strcmp(child->name, "sound") == 0) {
189 const u32 *id = of_get_property(sound, "layout-id", NULL);
193 snprintf(dev->sound.modalias, 32,
194 "sound-layout-%d", layout);
197 id = of_get_property(sound, "device-id", NULL);
199 * We probably cannot handle all device-id machines,
200 * so restrict to those we do handle for now.
202 if (id && (*id == 22 || *id == 14 || *id == 35)) {
203 snprintf(dev->sound.modalias, 32,
204 "aoa-device-id-%d", *id);
210 /* for the time being, until we can handle non-layout-id
211 * things in some fabric, refuse to attach if there is no
212 * layout-id property or we haven't been forced to attach.
213 * When there are two i2s busses and only one has a layout-id,
214 * then this depends on the order, but that isn't important
215 * either as the second one in that case is just a modem. */
221 mutex_init(&dev->lock);
222 spin_lock_init(&dev->low_lock);
223 dev->sound.ofdev.node = np;
224 dev->sound.ofdev.dma_mask = macio->ofdev.dma_mask;
225 dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.dma_mask;
226 dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
227 dev->sound.ofdev.dev.release = i2sbus_release_dev;
228 dev->sound.attach_codec = i2sbus_attach_codec;
229 dev->sound.detach_codec = i2sbus_detach_codec;
230 dev->sound.pcmid = -1;
232 dev->control = control;
233 dev->bus_number = np->name[4] - 'a';
234 INIT_LIST_HEAD(&dev->sound.codec_list);
236 for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
237 dev->interrupts[i] = -1;
238 snprintf(dev->rnames[i], sizeof(dev->rnames[i]),
239 rnames[i], np->name);
241 for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
242 int irq = irq_of_parse_and_map(np, i);
243 if (request_irq(irq, ints[i], 0, dev->rnames[i], dev))
245 dev->interrupts[i] = irq;
249 /* Resource handling is problematic as some device-trees contain
250 * useless crap (ugh ugh ugh). We work around that here by calling
251 * specific functions for calculating the appropriate resources.
253 * This will all be moved to macio_asic.c at one point
255 for (i = aoa_resource_i2smmio; i <= aoa_resource_rxdbdma; i++) {
256 if (i2sbus_get_and_fixup_rsrc(np,i,layout,&dev->resources[i]))
258 /* If only we could use our resource dev->resources[i]...
259 * but request_resource doesn't know about parents and
260 * contained resources...
262 dev->allocated_resource[i] =
263 request_mem_region(dev->resources[i].start,
264 dev->resources[i].end -
265 dev->resources[i].start + 1,
267 if (!dev->allocated_resource[i]) {
268 printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
273 r = &dev->resources[aoa_resource_i2smmio];
274 rlen = r->end - r->start + 1;
275 if (rlen < sizeof(struct i2s_interface_regs))
277 dev->intfregs = ioremap(r->start, rlen);
279 r = &dev->resources[aoa_resource_txdbdma];
280 rlen = r->end - r->start + 1;
281 if (rlen < sizeof(struct dbdma_regs))
283 dev->out.dbdma = ioremap(r->start, rlen);
285 r = &dev->resources[aoa_resource_rxdbdma];
286 rlen = r->end - r->start + 1;
287 if (rlen < sizeof(struct dbdma_regs))
289 dev->in.dbdma = ioremap(r->start, rlen);
291 if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
294 if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
297 if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
301 if (i2sbus_control_add_dev(dev->control, dev)) {
302 printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
306 if (soundbus_add_one(&dev->sound)) {
307 printk(KERN_DEBUG "i2sbus: device registration error!\n");
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);
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);
327 if (dev->allocated_resource[i])
328 release_and_free_resource(dev->allocated_resource[i]);
329 mutex_destroy(&dev->lock);
334 static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
336 struct device_node *np = NULL;
338 struct i2sbus_control *control = NULL;
340 err = i2sbus_control_init(dev, &control);
344 printk(KERN_ERR "i2sbus_control_init API breakage\n");
348 while ((np = of_get_next_child(dev->ofdev.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);
356 /* found none, clean up */
357 i2sbus_control_destroy(control);
361 dev_set_drvdata(&dev->ofdev.dev, control);
366 static int i2sbus_remove(struct macio_dev* dev)
368 struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
369 struct i2sbus_dev *i2sdev, *tmp;
371 list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
372 soundbus_remove_one(&i2sdev->sound);
378 static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
380 struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
381 struct codec_info_item *cii;
382 struct i2sbus_dev* i2sdev;
385 list_for_each_entry(i2sdev, &control->list, item) {
387 if (i2sdev->sound.pcm) {
388 /* Suspend PCM streams */
389 snd_pcm_suspend_all(i2sdev->sound.pcm);
393 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
395 if (cii->codec->suspend)
396 err = cii->codec->suspend(cii, state);
401 /* wait until streams are stopped */
402 i2sbus_wait_for_stop_both(i2sdev);
408 static int i2sbus_resume(struct macio_dev* dev)
410 struct i2sbus_control *control = dev_get_drvdata(&dev->ofdev.dev);
411 struct codec_info_item *cii;
412 struct i2sbus_dev* i2sdev;
415 list_for_each_entry(i2sdev, &control->list, item) {
416 /* reset i2s bus format etc. */
417 i2sbus_pcm_prepare_both(i2sdev);
419 /* Notify codecs so they can re-initialize */
420 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
422 if (cii->codec->resume)
423 err = cii->codec->resume(cii);
431 #endif /* CONFIG_PM */
433 static int i2sbus_shutdown(struct macio_dev* dev)
438 static struct macio_driver i2sbus_drv = {
439 .name = "soundbus-i2s",
440 .owner = THIS_MODULE,
441 .match_table = i2sbus_match,
442 .probe = i2sbus_probe,
443 .remove = i2sbus_remove,
445 .suspend = i2sbus_suspend,
446 .resume = i2sbus_resume,
448 .shutdown = i2sbus_shutdown,
451 static int __init soundbus_i2sbus_init(void)
453 return macio_register_driver(&i2sbus_drv);
456 static void __exit soundbus_i2sbus_exit(void)
458 macio_unregister_driver(&i2sbus_drv);
461 module_init(soundbus_i2sbus_init);
462 module_exit(soundbus_i2sbus_exit);