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 if (macio_irq_count(macio
) != 3)
135 dev
= kzalloc(sizeof(struct i2sbus_dev
), GFP_KERNEL
);
140 while ((child
= of_get_next_child(np
, child
))) {
141 if (strcmp(child
->name
, "sound") == 0) {
148 layout_id
= (u32
*) get_property(sound
, "layout-id", NULL
);
150 snprintf(dev
->sound
.modalias
, 32,
151 "sound-layout-%d", *layout_id
);
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. */
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;
177 dev
->control
= control
;
178 dev
->bus_number
= np
->name
[4] - 'a';
179 INIT_LIST_HEAD(&dev
->sound
.codec_list
);
182 dev
->interrupts
[i
] = -1;
183 snprintf(dev
->rnames
[i
], sizeof(dev
->rnames
[i
]), rnames
[i
], np
->name
);
186 if (request_irq(macio_irq(macio
, i
), ints
[i
], 0,
187 dev
->rnames
[i
], dev
))
189 dev
->interrupts
[i
] = macio_irq(macio
, i
);
193 if (of_address_to_resource(np
, i
, &dev
->resources
[i
]))
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,
203 if (!dev
->allocated_resource
[i
]) {
204 printk(KERN_ERR
"i2sbus: failed to claim resource %d!\n", i
);
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
)
218 if (alloc_dbdma_descriptor_ring(dev
, &dev
->out
.dbdma_ring
,
221 if (alloc_dbdma_descriptor_ring(dev
, &dev
->in
.dbdma_ring
,
225 if (i2sbus_control_add_dev(dev
->control
, dev
)) {
226 printk(KERN_ERR
"i2sbus: control layer didn't like bus\n");
230 if (soundbus_add_one(&dev
->sound
)) {
231 printk(KERN_DEBUG
"i2sbus: device registration error!\n");
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);
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
);
251 if (dev
->allocated_resource
[i
])
252 release_and_free_resource(dev
->allocated_resource
[i
]);
253 mutex_destroy(&dev
->lock
);
258 static int i2sbus_probe(struct macio_dev
* dev
, const struct of_device_id
*match
)
260 struct device_node
*np
= NULL
;
262 struct i2sbus_control
*control
= NULL
;
264 err
= i2sbus_control_init(dev
, &control
);
268 printk(KERN_ERR
"i2sbus_control_init API breakage\n");
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
);
280 /* found none, clean up */
281 i2sbus_control_destroy(control
);
285 dev
->ofdev
.dev
.driver_data
= control
;
290 static int i2sbus_remove(struct macio_dev
* dev
)
292 struct i2sbus_control
*control
= dev
->ofdev
.dev
.driver_data
;
293 struct i2sbus_dev
*i2sdev
, *tmp
;
295 list_for_each_entry_safe(i2sdev
, tmp
, &control
->list
, item
)
296 soundbus_remove_one(&i2sdev
->sound
);
302 static int i2sbus_suspend(struct macio_dev
* dev
, pm_message_t state
)
304 struct i2sbus_control
*control
= dev
->ofdev
.dev
.driver_data
;
305 struct codec_info_item
*cii
;
306 struct i2sbus_dev
* i2sdev
;
309 list_for_each_entry(i2sdev
, &control
->list
, item
) {
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
);
320 list_for_each_entry(cii
, &i2sdev
->sound
.codec_list
, list
) {
322 if (cii
->codec
->suspend
)
323 err
= cii
->codec
->suspend(cii
, state
);
331 static int i2sbus_resume(struct macio_dev
* dev
)
333 struct i2sbus_control
*control
= dev
->ofdev
.dev
.driver_data
;
334 struct codec_info_item
*cii
;
335 struct i2sbus_dev
* i2sdev
;
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
) {
342 if (cii
->codec
->resume
)
343 err
= cii
->codec
->resume(cii
);
348 if (i2sdev
->sound
.pcm
) {
349 /* Same comment as above, probably useless */
350 snd_power_change_state(i2sdev
->sound
.pcm
->card
,
357 #endif /* CONFIG_PM */
359 static int i2sbus_shutdown(struct macio_dev
* dev
)
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
,
371 .suspend
= i2sbus_suspend
,
372 .resume
= i2sbus_resume
,
374 .shutdown
= i2sbus_shutdown
,
377 static int __init
soundbus_i2sbus_init(void)
379 return macio_register_driver(&i2sbus_drv
);
382 static void __exit
soundbus_i2sbus_exit(void)
384 macio_unregister_driver(&i2sbus_drv
);
387 module_init(soundbus_i2sbus_init
);
388 module_exit(soundbus_i2sbus_exit
);