4 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
6 * GPL v2, can be found in COPYING.
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"
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");
27 static struct of_device_id i2sbus_match[] = {
32 static int alloc_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
33 struct dbdma_command_mem *r,
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
41 r->space = dma_alloc_coherent(
42 &macio_get_pci_dev(i2sdev->macio)->dev,
47 if (!r->space) return -ENOMEM;
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);
57 static void free_dbdma_descriptor_ring(struct i2sbus_dev *i2sdev,
58 struct dbdma_command_mem *r)
60 if (!r->space) return;
62 dma_free_coherent(&macio_get_pci_dev(i2sdev->macio)->dev,
63 r->size, r->space, r->bus_addr);
66 static void i2sbus_release_dev(struct device *dev)
68 struct i2sbus_dev *i2sdev;
71 i2sdev = container_of(dev, struct i2sbus_dev, sound.ofdev.dev);
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);
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);
82 free_irq(i2sdev->interrupts[i], i2sdev);
83 i2sbus_control_remove_dev(i2sdev->control, i2sdev);
84 mutex_destroy(&i2sdev->lock);
88 static irqreturn_t i2sbus_bus_intr(int irq, void *devid, struct pt_regs *regs)
90 struct i2sbus_dev *dev = devid;
93 spin_lock(&dev->low_lock);
94 intreg = in_le32(&dev->intfregs->intr_ctl);
96 /* acknowledge interrupt reasons */
97 out_le32(&dev->intfregs->intr_ctl, intreg);
99 spin_unlock(&dev->low_lock);
105 module_param(force, int, 0444);
106 MODULE_PARM_DESC(force, "Force loading i2sbus even when"
107 " no layout-id property is present");
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)
114 struct i2sbus_dev *dev;
115 struct device_node *child = NULL, *sound = NULL;
117 static const char *rnames[] = { "i2sbus: %s (control)",
120 static irqreturn_t (*ints[])(int irq, void *devid,
121 struct pt_regs *regs) = {
127 if (strlen(np->name) != 5)
129 if (strncmp(np->name, "i2s-", 4))
132 dev = kzalloc(sizeof(struct i2sbus_dev), GFP_KERNEL);
137 while ((child = of_get_next_child(np, child))) {
138 if (strcmp(child->name, "sound") == 0) {
145 layout_id = (u32*) get_property(sound, "layout-id", NULL);
147 snprintf(dev->sound.modalias, 32,
148 "sound-layout-%d", *layout_id);
152 /* for the time being, until we can handle non-layout-id
153 * things in some fabric, refuse to attach if there is no
154 * layout-id property or we haven't been forced to attach.
155 * When there are two i2s busses and only one has a layout-id,
156 * then this depends on the order, but that isn't important
157 * either as the second one in that case is just a modem. */
163 mutex_init(&dev->lock);
164 spin_lock_init(&dev->low_lock);
165 dev->sound.ofdev.node = np;
166 dev->sound.ofdev.dma_mask = macio->ofdev.dma_mask;
167 dev->sound.ofdev.dev.dma_mask = &dev->sound.ofdev.dma_mask;
168 dev->sound.ofdev.dev.parent = &macio->ofdev.dev;
169 dev->sound.ofdev.dev.release = i2sbus_release_dev;
170 dev->sound.attach_codec = i2sbus_attach_codec;
171 dev->sound.detach_codec = i2sbus_detach_codec;
172 dev->sound.pcmid = -1;
174 dev->control = control;
175 dev->bus_number = np->name[4] - 'a';
176 INIT_LIST_HEAD(&dev->sound.codec_list);
179 dev->interrupts[i] = -1;
180 snprintf(dev->rnames[i], sizeof(dev->rnames[i]), rnames[i], np->name);
183 int irq = irq_of_parse_and_map(np, i);
184 if (request_irq(irq, ints[i], 0, dev->rnames[i], dev))
186 dev->interrupts[i] = irq;
190 if (of_address_to_resource(np, i, &dev->resources[i]))
192 /* if only we could use our resource dev->resources[i]...
193 * but request_resource doesn't know about parents and
194 * contained resources... */
195 dev->allocated_resource[i] =
196 request_mem_region(dev->resources[i].start,
197 dev->resources[i].end -
198 dev->resources[i].start + 1,
200 if (!dev->allocated_resource[i]) {
201 printk(KERN_ERR "i2sbus: failed to claim resource %d!\n", i);
205 /* should do sanity checking here about length of them */
206 dev->intfregs = ioremap(dev->resources[0].start,
207 dev->resources[0].end-dev->resources[0].start+1);
208 dev->out.dbdma = ioremap(dev->resources[1].start,
209 dev->resources[1].end-dev->resources[1].start+1);
210 dev->in.dbdma = ioremap(dev->resources[2].start,
211 dev->resources[2].end-dev->resources[2].start+1);
212 if (!dev->intfregs || !dev->out.dbdma || !dev->in.dbdma)
215 if (alloc_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring,
218 if (alloc_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring,
222 if (i2sbus_control_add_dev(dev->control, dev)) {
223 printk(KERN_ERR "i2sbus: control layer didn't like bus\n");
227 if (soundbus_add_one(&dev->sound)) {
228 printk(KERN_DEBUG "i2sbus: device registration error!\n");
232 /* enable this cell */
233 i2sbus_control_cell(dev->control, dev, 1);
234 i2sbus_control_enable(dev->control, dev);
235 i2sbus_control_clock(dev->control, dev, 1);
240 if (dev->interrupts[i] != -1)
241 free_irq(dev->interrupts[i], dev);
242 free_dbdma_descriptor_ring(dev, &dev->out.dbdma_ring);
243 free_dbdma_descriptor_ring(dev, &dev->in.dbdma_ring);
244 if (dev->intfregs) iounmap(dev->intfregs);
245 if (dev->out.dbdma) iounmap(dev->out.dbdma);
246 if (dev->in.dbdma) iounmap(dev->in.dbdma);
248 if (dev->allocated_resource[i])
249 release_and_free_resource(dev->allocated_resource[i]);
250 mutex_destroy(&dev->lock);
255 static int i2sbus_probe(struct macio_dev* dev, const struct of_device_id *match)
257 struct device_node *np = NULL;
259 struct i2sbus_control *control = NULL;
261 err = i2sbus_control_init(dev, &control);
265 printk(KERN_ERR "i2sbus_control_init API breakage\n");
269 while ((np = of_get_next_child(dev->ofdev.node, np))) {
270 if (device_is_compatible(np, "i2sbus") ||
271 device_is_compatible(np, "i2s-modem")) {
272 got += i2sbus_add_dev(dev, control, np);
277 /* found none, clean up */
278 i2sbus_control_destroy(control);
282 dev->ofdev.dev.driver_data = control;
287 static int i2sbus_remove(struct macio_dev* dev)
289 struct i2sbus_control *control = dev->ofdev.dev.driver_data;
290 struct i2sbus_dev *i2sdev, *tmp;
292 list_for_each_entry_safe(i2sdev, tmp, &control->list, item)
293 soundbus_remove_one(&i2sdev->sound);
299 static int i2sbus_suspend(struct macio_dev* dev, pm_message_t state)
301 struct i2sbus_control *control = dev->ofdev.dev.driver_data;
302 struct codec_info_item *cii;
303 struct i2sbus_dev* i2sdev;
306 list_for_each_entry(i2sdev, &control->list, item) {
308 if (i2sdev->sound.pcm) {
309 /* Suspend PCM streams */
310 snd_pcm_suspend_all(i2sdev->sound.pcm);
311 /* Probably useless as we handle
312 * power transitions ourselves */
313 snd_power_change_state(i2sdev->sound.pcm->card,
314 SNDRV_CTL_POWER_D3hot);
317 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
319 if (cii->codec->suspend)
320 err = cii->codec->suspend(cii, state);
328 static int i2sbus_resume(struct macio_dev* dev)
330 struct i2sbus_control *control = dev->ofdev.dev.driver_data;
331 struct codec_info_item *cii;
332 struct i2sbus_dev* i2sdev;
335 list_for_each_entry(i2sdev, &control->list, item) {
336 /* Notify codecs so they can re-initialize */
337 list_for_each_entry(cii, &i2sdev->sound.codec_list, list) {
339 if (cii->codec->resume)
340 err = cii->codec->resume(cii);
345 if (i2sdev->sound.pcm) {
346 /* Same comment as above, probably useless */
347 snd_power_change_state(i2sdev->sound.pcm->card,
354 #endif /* CONFIG_PM */
356 static int i2sbus_shutdown(struct macio_dev* dev)
361 static struct macio_driver i2sbus_drv = {
362 .name = "soundbus-i2s",
363 .owner = THIS_MODULE,
364 .match_table = i2sbus_match,
365 .probe = i2sbus_probe,
366 .remove = i2sbus_remove,
368 .suspend = i2sbus_suspend,
369 .resume = i2sbus_resume,
371 .shutdown = i2sbus_shutdown,
374 static int __init soundbus_i2sbus_init(void)
376 return macio_register_driver(&i2sbus_drv);
379 static void __exit soundbus_i2sbus_exit(void)
381 macio_unregister_driver(&i2sbus_drv);
384 module_init(soundbus_i2sbus_init);
385 module_exit(soundbus_i2sbus_exit);