[POWERPC] Fix legacy serial search for opb bus ports
[wrt350n-kernel.git] / sound / aoa / soundbus / i2sbus / i2sbus-core.c
blobe6beb92c6933f9df991af076f3ed17fb7b36b214
1 /*
2 * i2sbus driver
4 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6 * GPL v2, can be found in COPYING.
7 */
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"
20 #include "i2sbus.h"
22 MODULE_LICENSE("GPL");
23 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
24 MODULE_DESCRIPTION("Apple Soundbus: I2S support");
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");
31 static struct of_device_id i2sbus_match[] = {
32 { .name = "i2s" },
33 { }
36 MODULE_DEVICE_TABLE(of, i2sbus_match);
38 static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
39 struct dbdma_command_mem *r,
40 int numcmds)
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,
49 r->size,
50 &r->bus_addr,
51 GFP_KERNEL);
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);
60 return 0;
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;
75 int i;
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);
91 kfree(i2sdev);
94 static irqreturn_t i2sbus_bus_intr(int irq, void *devid)
96 struct i2sbus_dev *dev = devid;
97 u32 intreg;
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);
107 return IRQ_HANDLED;
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;
123 const u32 *reg;
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
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);
140 if (rc)
141 goto bail;
142 reg = of_get_property(np, "reg", NULL);
143 if (reg == NULL) {
144 rc = -ENXIO;
145 goto bail;
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;
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;
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
172 if (strlen(np->name) != 5)
173 return 0;
174 if (strncmp(np->name, "i2s-", 4))
175 return 0;
177 dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL);
178 if (!dev)
179 return 0;
181 i = 0;
182 while ((child = of_get_next_child(np, child))) {
183 if (strcmp(child->name, "sound") == 0) {
184 i++;
185 sound = child;
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;
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;
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);
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);
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;
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.
241 * This will all be moved to macio_asic.c at one point
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...
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;
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);
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);
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);
279 if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
280 goto err;
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;
289 if (i2sbus_control_add_dev(dev->control, dev)) {
290 printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
291 goto err;
294 if (soundbus_add_one(&dev->sound)) {
295 printk(KERN_DEBUG "i2sbus: device registration error!\n");
296 goto err;
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);
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;
322 static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
324 struct device_node *np = NULL;
325 int got = 0, err;
326 struct i2sbus_control *control = NULL;
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;
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);
343 if (!got) {
344 /* found none, clean up */
345 i2sbus_control_destroy(control);
346 return -ENODEV;
349 dev->ofdev.dev.driver_data = control;
351 return 0;
354 static int i2sbus_remove(struct macio_dev* dev)
356 struct i2sbus_control *control = dev->ofdev.dev.driver_data;
357 struct i2sbus_dev *i2sdev, *tmp;
359 list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
360 soundbus_remove_one(&i2sdev->sound);
362 return 0;
365 #ifdef CONFIG_PM
366 static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
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;
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);
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;
389 /* wait until streams are stopped */
390 i2sbus_wait_for_stop_both(i2sdev);
393 return ret;
396 static int i2sbus_resume(struct macio_dev* dev)
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;
403 list_for_each_entry(i2sdev, &control->list, item) {
404 /* reset i2s bus format etc. */
405 i2sbus_pcm_prepare_both(i2sdev);
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;
417 return ret;
419 #endif /* CONFIG_PM */
421 static int i2sbus_shutdown(struct macio_dev* dev)
423 return 0;
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,
439 static int __init soundbus_i2sbus_init(void)
441 return macio_register_driver(&i2sbus_drv);
444 static void __exit soundbus_i2sbus_exit(void)
446 macio_unregister_driver(&i2sbus_drv);
449 module_init(soundbus_i2sbus_init);
450 module_exit(soundbus_i2sbus_exit);