Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...
[pandora-kernel.git] / sound / aoa / soundbus / i2sbus / i2sbus-core.c
1 /*
2  * i2sbus driver
3  *
4  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
5  *
6  * GPL v2, can be found in COPYING.
7  */
8
9 #include <linux/module.h>
10 #include <asm/macio.h>
11 #include <asm/dbdma.h>
12 #include <linux/pci.h>
13 #include <linux/interrupt.h>
14 #include <sound/driver.h>
15 #include <sound/core.h>
16 #include <linux/dma-mapping.h>
17 #include "../soundbus.h"
18 #include "i2sbus.h"
19
20 MODULE_LICENSE("GPL");
21 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
22 MODULE_DESCRIPTION("Apple Soundbus: I2S support");
23 /* for auto-loading, declare that we handle this weird
24  * string that macio puts into the relevant device */
25 MODULE_ALIAS("of:Ni2sTi2sC");
26
27 static struct of_device_id i2sbus_match[] = {
28         { .name = "i2s" },
29         { }
30 };
31
32 static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
33                                        struct dbdma_command_mem *r,
34                                        int numcmds)
35 {
36         /* one more for rounding */
37         r->size = (numcmds+1) * sizeof(struct dbdma_cmd);
38         /* We use the PCI APIs for now until the generic one gets fixed
39          * enough or until we get some macio-specific versions
40          */
41         r->space = dma_alloc_coherent(
42                         &macio_get_pci_dev(i2sdev->macio)->dev,
43                         r->size,
44                         &r->bus_addr,
45                         GFP_KERNEL);
46
47         if (!r->space) return -ENOMEM;
48
49         memset(r->space, 0, r->size);
50         r->cmds = (void*)DBDMA_ALIGN(r->space);
51         r->bus_cmd_start = r->bus_addr +
52                            (dma_addr_t)((char*)r->cmds - (char*)r->space);
53
54         return 0;
55 }
56
57 static void free_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
58                                        struct dbdma_command_mem *r)
59 {
60         if (!r->space) return;
61         
62         dma_free_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
63                             r->size, r->space, r->bus_addr);
64 }
65
66 static void i2sbus_release_dev(struct device *dev)
67 {
68         struct i2sbus_dev *i2sdev;
69         int i;
70
71         i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);
72
73         if (i2sdev->intfregs) iounmap(i2sdev->intfregs);
74         if (i2sdev->out.dbdma) iounmap(i2sdev->out.dbdma);
75         if (i2sdev->in.dbdma) iounmap(i2sdev->in.dbdma);
76         for (i=0;i<3;i++)
77                 if (i2sdev->allocated_resource[i])
78                         release_and_free_resource(i2sdev->allocated_resource[i]);
79         free_dbdma_descriptor_ring(i2sdev, &i2sdev->out.dbdma_ring);
80         free_dbdma_descriptor_ring(i2sdev, &i2sdev->in.dbdma_ring);
81         for (i=0;i<3;i++)
82                 free_irq(i2sdev->interrupts[i], i2sdev);
83         i2sbus_control_remove_dev(i2sdev->control, i2sdev);
84         mutex_destroy(&i2sdev->lock);
85         kfree(i2sdev);
86 }
87
88 static irqreturn_t i2sbus_bus_intr(int irq, void *devid, struct pt_regs *regs)
89 {
90         struct i2sbus_dev *dev = devid;
91         u32 intreg;
92
93         spin_lock(&dev->low_lock);
94         intreg = in_le32(&dev->intfregs->intr_ctl);
95
96         /* acknowledge interrupt reasons */
97         out_le32(&dev->intfregs->intr_ctl, intreg);
98
99         spin_unlock(&dev->low_lock);
100
101         return IRQ_HANDLED;
102 }
103
104 static int force;
105 module_param(force, int, 0444);
106 MODULE_PARM_DESC(force, "Force loading i2sbus even when"
107                         " no layout-id property is present");
108
109 /* FIXME: look at device node refcounting */
110 static int i2sbus_add_dev(struct macio_dev *macio,
111                           struct i2sbus_control *control,
112                           struct device_node *np)
113 {
114         struct i2sbus_dev *dev;
115         struct device_node *child = NULL, *sound = NULL;
116         int i;
117         static const char *rnames[] = { "i2sbus: %s (control)",
118                                         "i2sbus: %s (tx)",
119                                         "i2sbus: %s (rx)" };
120         static irqreturn_t (*ints[])(int irq, void *devid,
121                                      struct pt_regs *regs) = {
122                 i2sbus_bus_intr,
123                 i2sbus_tx_intr,
124                 i2sbus_rx_intr
125         };
126
127         if (strlen(np->name) != 5)
128                 return 0;
129         if (strncmp(np->name, "i2s-", 4))
130                 return 0;
131
132         if (macio_irq_count(macio) != 3)
133                 return 0;
134
135         dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL);
136         if (!dev)
137                 return 0;
138
139         i = 0;
140         while ((child = of_get_next_child(np, child))) {
141                 if (strcmp(child->name, "sound") == 0) {
142                         i++;
143                         sound = child;
144                 }
145         }
146         if (i == 1) {
147                 u32 *layout_id;
148                 layout_id = (u32*) get_property(sound, "layout-id", NULL);
149                 if (layout_id) {
150                         snprintf(dev->sound.modalias, 32,
151                                  "sound-layout-%d", *layout_id);
152                         force = 1;
153                 }
154         }
155         /* for the time being, until we can handle non-layout-id
156          * things in some fabric, refuse to attach if there is no
157          * layout-id property or we haven't been forced to attach.
158          * When there are two i2s busses and only one has a layout-id,
159          * then this depends on the order, but that isn't important
160          * either as the second one in that case is just a modem. */
161         if (!force) {
162                 kfree(dev);
163                 return -ENODEV;
164         }
165
166         mutex_init(&dev->lock);
167         spin_lock_init(&dev->low_lock);
168         dev->sound.ofdev.node = np;
169         dev->sound.ofdev.dma_mask = macio->ofdev.dma_mask;
170         dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.dma_mask;
171         dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
172         dev->sound.ofdev.dev.release = i2sbus_release_dev;
173         dev->sound.attach_codec = i2sbus_attach_codec;
174         dev->sound.detach_codec = i2sbus_detach_codec;
175         dev->sound.pcmid = -1;
176         dev->macio = macio;
177         dev->control = control;
178         dev->bus_number = np->name[4] - 'a';
179         INIT_LIST_HEAD(&dev->sound.codec_list);
180
181         for (i=0;i<3;i++) {
182                 dev->interrupts[i] = -1;
183                 snprintf(dev->rnames[i], sizeof(dev->rnames[i]), rnames[i], np->name);
184         }
185         for (i=0;i<3;i++) {
186                 if (request_irq(macio_irq(macio, i), ints[i], 0,
187                                 dev->rnames[i], dev))
188                         goto err;
189                 dev->interrupts[i] = macio_irq(macio, i);
190         }
191
192         for (i=0;i<3;i++) {
193                 if (of_address_to_resource(np, i, &dev->resources[i]))
194                         goto err;
195                 /* if only we could use our resource dev->resources[i]...
196                  * but request_resource doesn't know about parents and
197                  * contained resources... */
198                 dev->allocated_resource[i] = 
199                         request_mem_region(dev->resources[i].start,
200                                            dev->resources[i].end -
201                                            dev->resources[i].start + 1,
202                                            dev->rnames[i]);
203                 if (!dev->allocated_resource[i]) {
204                         printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
205                         goto err;
206                 }
207         }
208         /* should do sanity checking here about length of them */
209         dev->intfregs = ioremap(dev->resources[0].start,
210                                 dev->resources[0].end-dev->resources[0].start+1);
211         dev->out.dbdma = ioremap(dev->resources[1].start,
212                                  dev->resources[1].end-dev->resources[1].start+1);
213         dev->in.dbdma = ioremap(dev->resources[2].start,
214                                 dev->resources[2].end-dev->resources[2].start+1);
215         if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
216                 goto err;
217
218         if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
219                                         MAX_DBDMA_COMMANDS))
220                 goto err;
221         if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
222                                         MAX_DBDMA_COMMANDS))
223                 goto err;
224
225         if (i2sbus_control_add_dev(dev->control, dev)) {
226                 printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
227                 goto err;
228         }
229
230         if (soundbus_add_one(&dev->sound)) {
231                 printk(KERN_DEBUG "i2sbus: device registration error!\n");
232                 goto err;
233         }
234
235         /* enable this cell */
236         i2sbus_control_cell(dev->control, dev, 1);
237         i2sbus_control_enable(dev->control, dev);
238         i2sbus_control_clock(dev->control, dev, 1);
239
240         return 1;
241  err:
242         for (i=0;i<3;i++)
243                 if (dev->interrupts[i] != -1)
244                         free_irq(dev->interrupts[i], dev);
245         free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
246         free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
247         if (dev->intfregs) iounmap(dev->intfregs);
248         if (dev->out.dbdma) iounmap(dev->out.dbdma);
249         if (dev->in.dbdma) iounmap(dev->in.dbdma);
250         for (i=0;i<3;i++)
251                 if (dev->allocated_resource[i])
252                         release_and_free_resource(dev->allocated_resource[i]);
253         mutex_destroy(&dev->lock);
254         kfree(dev);
255         return 0;
256 }
257
258 static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
259 {
260         struct device_node *np = NULL;
261         int got = 0, err;
262         struct i2sbus_control *control = NULL;
263
264         err = i2sbus_control_init(dev, &control);
265         if (err)
266                 return err;
267         if (!control) {
268                 printk(KERN_ERR "i2sbus_control_init API breakage\n");
269                 return -ENODEV;
270         }
271
272         while ((np = of_get_next_child(dev->ofdev.node, np))) {
273                 if (device_is_compatible(np, "i2sbus") ||
274                     device_is_compatible(np, "i2s-modem")) {
275                         got += i2sbus_add_dev(dev, control, np);
276                 }
277         }
278
279         if (!got) {
280                 /* found none, clean up */
281                 i2sbus_control_destroy(control);
282                 return -ENODEV;
283         }
284
285         dev->ofdev.dev.driver_data = control;
286
287         return 0;
288 }
289
290 static int i2sbus_remove(struct macio_dev* dev)
291 {
292         struct i2sbus_control *control = dev->ofdev.dev.driver_data;
293         struct i2sbus_dev *i2sdev, *tmp;
294
295         list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
296                 soundbus_remove_one(&i2sdev->sound);
297
298         return 0;
299 }
300
301 #ifdef CONFIG_PM
302 static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
303 {
304         struct i2sbus_control *control = dev->ofdev.dev.driver_data;
305         struct codec_info_item *cii;
306         struct i2sbus_dev* i2sdev;
307         int err, ret = 0;
308
309         list_for_each_entry(i2sdev, &control->list, item) {
310                 /* Notify Alsa */
311                 if (i2sdev->sound.pcm) {
312                         /* Suspend PCM streams */
313                         snd_pcm_suspend_all(i2sdev->sound.pcm);
314                         /* Probably useless as we handle
315                          * power transitions ourselves */
316                         snd_power_change_state(i2sdev->sound.pcm->card,
317                                                SNDRV_CTL_POWER_D3hot);
318                 }
319                 /* Notify codecs */
320                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
321                         err = 0;
322                         if (cii->codec->suspend)
323                                 err = cii->codec->suspend(cii, state);
324                         if (err)
325                                 ret = err;
326                 }
327         }
328         return ret;
329 }
330
331 static int i2sbus_resume(struct macio_dev* dev)
332 {
333         struct i2sbus_control *control = dev->ofdev.dev.driver_data;
334         struct codec_info_item *cii;
335         struct i2sbus_dev* i2sdev;
336         int err, ret = 0;
337
338         list_for_each_entry(i2sdev, &control->list, item) {
339                 /* Notify codecs so they can re-initialize */
340                 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
341                         err = 0;
342                         if (cii->codec->resume)
343                                 err = cii->codec->resume(cii);
344                         if (err)
345                                 ret = err;
346                 }
347                 /* Notify Alsa */
348                 if (i2sdev->sound.pcm) {
349                         /* Same comment as above, probably useless */
350                         snd_power_change_state(i2sdev->sound.pcm->card,
351                                                SNDRV_CTL_POWER_D0);
352                 }
353         }
354
355         return ret;
356 }
357 #endif /* CONFIG_PM */
358
359 static int i2sbus_shutdown(struct macio_dev* dev)
360 {
361         return 0;
362 }
363
364 static struct macio_driver i2sbus_drv = {
365         .name = "soundbus-i2s",
366         .owner = THIS_MODULE,
367         .match_table = i2sbus_match,
368         .probe = i2sbus_probe,
369         .remove = i2sbus_remove,
370 #ifdef CONFIG_PM
371         .suspend = i2sbus_suspend,
372         .resume = i2sbus_resume,
373 #endif
374         .shutdown = i2sbus_shutdown,
375 };
376
377 static int __init soundbus_i2sbus_init(void)
378 {
379         return macio_register_driver(&i2sbus_drv);
380 }
381
382 static void __exit soundbus_i2sbus_exit(void)
383 {
384         macio_unregister_driver(&i2sbus_drv);
385 }
386
387 module_init(soundbus_i2sbus_init);
388 module_exit(soundbus_i2sbus_exit);