xref: /linux/include/sound/hdaudio.h (revision bab2c80e5a6c855657482eac9e97f5f3eedb509a)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * HD-audio core stuff
4  */
5 
6 #ifndef __SOUND_HDAUDIO_H
7 #define __SOUND_HDAUDIO_H
8 
9 #include <linux/device.h>
10 #include <linux/interrupt.h>
11 #include <linux/timecounter.h>
12 #include <sound/core.h>
13 #include <sound/memalloc.h>
14 #include <sound/hda_verbs.h>
15 #include <drm/i915_component.h>
16 
17 /* codec node id */
18 typedef u16 hda_nid_t;
19 
20 struct hdac_bus;
21 struct hdac_stream;
22 struct hdac_device;
23 struct hdac_driver;
24 struct hdac_widget_tree;
25 struct hda_device_id;
26 
27 /*
28  * exported bus type
29  */
30 extern struct bus_type snd_hda_bus_type;
31 
32 /*
33  * generic arrays
34  */
35 struct snd_array {
36 	unsigned int used;
37 	unsigned int alloced;
38 	unsigned int elem_size;
39 	unsigned int alloc_align;
40 	void *list;
41 };
42 
43 /*
44  * HD-audio codec base device
45  */
46 struct hdac_device {
47 	struct device dev;
48 	int type;
49 	struct hdac_bus *bus;
50 	unsigned int addr;		/* codec address */
51 	struct list_head list;		/* list point for bus codec_list */
52 
53 	hda_nid_t afg;			/* AFG node id */
54 	hda_nid_t mfg;			/* MFG node id */
55 
56 	/* ids */
57 	unsigned int vendor_id;
58 	unsigned int subsystem_id;
59 	unsigned int revision_id;
60 	unsigned int afg_function_id;
61 	unsigned int mfg_function_id;
62 	unsigned int afg_unsol:1;
63 	unsigned int mfg_unsol:1;
64 
65 	unsigned int power_caps;	/* FG power caps */
66 
67 	const char *vendor_name;	/* codec vendor name */
68 	const char *chip_name;		/* codec chip name */
69 
70 	/* verb exec op override */
71 	int (*exec_verb)(struct hdac_device *dev, unsigned int cmd,
72 			 unsigned int flags, unsigned int *res);
73 
74 	/* widgets */
75 	unsigned int num_nodes;
76 	hda_nid_t start_nid, end_nid;
77 
78 	/* misc flags */
79 	atomic_t in_pm;		/* suspend/resume being performed */
80 	bool  link_power_control:1;
81 
82 	/* sysfs */
83 	struct hdac_widget_tree *widgets;
84 
85 	/* regmap */
86 	struct regmap *regmap;
87 	struct snd_array vendor_verbs;
88 	bool lazy_cache:1;	/* don't wake up for writes */
89 	bool caps_overwriting:1; /* caps overwrite being in process */
90 	bool cache_coef:1;	/* cache COEF read/write too */
91 };
92 
93 /* device/driver type used for matching */
94 enum {
95 	HDA_DEV_CORE,
96 	HDA_DEV_LEGACY,
97 	HDA_DEV_ASOC,
98 };
99 
100 /* direction */
101 enum {
102 	HDA_INPUT, HDA_OUTPUT
103 };
104 
105 #define dev_to_hdac_dev(_dev)	container_of(_dev, struct hdac_device, dev)
106 
107 int snd_hdac_device_init(struct hdac_device *dev, struct hdac_bus *bus,
108 			 const char *name, unsigned int addr);
109 void snd_hdac_device_exit(struct hdac_device *dev);
110 int snd_hdac_device_register(struct hdac_device *codec);
111 void snd_hdac_device_unregister(struct hdac_device *codec);
112 int snd_hdac_device_set_chip_name(struct hdac_device *codec, const char *name);
113 int snd_hdac_codec_modalias(struct hdac_device *hdac, char *buf, size_t size);
114 
115 int snd_hdac_refresh_widgets(struct hdac_device *codec, bool sysfs);
116 
117 unsigned int snd_hdac_make_cmd(struct hdac_device *codec, hda_nid_t nid,
118 			       unsigned int verb, unsigned int parm);
119 int snd_hdac_exec_verb(struct hdac_device *codec, unsigned int cmd,
120 		       unsigned int flags, unsigned int *res);
121 int snd_hdac_read(struct hdac_device *codec, hda_nid_t nid,
122 		  unsigned int verb, unsigned int parm, unsigned int *res);
123 int _snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid, int parm,
124 			unsigned int *res);
125 int snd_hdac_read_parm_uncached(struct hdac_device *codec, hda_nid_t nid,
126 				int parm);
127 int snd_hdac_override_parm(struct hdac_device *codec, hda_nid_t nid,
128 			   unsigned int parm, unsigned int val);
129 int snd_hdac_get_connections(struct hdac_device *codec, hda_nid_t nid,
130 			     hda_nid_t *conn_list, int max_conns);
131 int snd_hdac_get_sub_nodes(struct hdac_device *codec, hda_nid_t nid,
132 			   hda_nid_t *start_id);
133 unsigned int snd_hdac_calc_stream_format(unsigned int rate,
134 					 unsigned int channels,
135 					 unsigned int format,
136 					 unsigned int maxbps,
137 					 unsigned short spdif_ctls);
138 int snd_hdac_query_supported_pcm(struct hdac_device *codec, hda_nid_t nid,
139 				u32 *ratesp, u64 *formatsp, unsigned int *bpsp);
140 bool snd_hdac_is_supported_format(struct hdac_device *codec, hda_nid_t nid,
141 				  unsigned int format);
142 
143 int snd_hdac_codec_read(struct hdac_device *hdac, hda_nid_t nid,
144 			int flags, unsigned int verb, unsigned int parm);
145 int snd_hdac_codec_write(struct hdac_device *hdac, hda_nid_t nid,
146 			int flags, unsigned int verb, unsigned int parm);
147 bool snd_hdac_check_power_state(struct hdac_device *hdac,
148 		hda_nid_t nid, unsigned int target_state);
149 unsigned int snd_hdac_sync_power_state(struct hdac_device *hdac,
150 		      hda_nid_t nid, unsigned int target_state);
151 /**
152  * snd_hdac_read_parm - read a codec parameter
153  * @codec: the codec object
154  * @nid: NID to read a parameter
155  * @parm: parameter to read
156  *
157  * Returns -1 for error.  If you need to distinguish the error more
158  * strictly, use _snd_hdac_read_parm() directly.
159  */
160 static inline int snd_hdac_read_parm(struct hdac_device *codec, hda_nid_t nid,
161 				     int parm)
162 {
163 	unsigned int val;
164 
165 	return _snd_hdac_read_parm(codec, nid, parm, &val) < 0 ? -1 : val;
166 }
167 
168 #ifdef CONFIG_PM
169 int snd_hdac_power_up(struct hdac_device *codec);
170 int snd_hdac_power_down(struct hdac_device *codec);
171 int snd_hdac_power_up_pm(struct hdac_device *codec);
172 int snd_hdac_power_down_pm(struct hdac_device *codec);
173 int snd_hdac_keep_power_up(struct hdac_device *codec);
174 #else
175 static inline int snd_hdac_power_up(struct hdac_device *codec) { return 0; }
176 static inline int snd_hdac_power_down(struct hdac_device *codec) { return 0; }
177 static inline int snd_hdac_power_up_pm(struct hdac_device *codec) { return 0; }
178 static inline int snd_hdac_power_down_pm(struct hdac_device *codec) { return 0; }
179 static inline int snd_hdac_keep_power_up(struct hdac_device *codec) { return 0; }
180 #endif
181 
182 /*
183  * HD-audio codec base driver
184  */
185 struct hdac_driver {
186 	struct device_driver driver;
187 	int type;
188 	const struct hda_device_id *id_table;
189 	int (*match)(struct hdac_device *dev, struct hdac_driver *drv);
190 	void (*unsol_event)(struct hdac_device *dev, unsigned int event);
191 };
192 
193 #define drv_to_hdac_driver(_drv) container_of(_drv, struct hdac_driver, driver)
194 
195 const struct hda_device_id *
196 hdac_get_device_id(struct hdac_device *hdev, struct hdac_driver *drv);
197 
198 /*
199  * Bus verb operators
200  */
201 struct hdac_bus_ops {
202 	/* send a single command */
203 	int (*command)(struct hdac_bus *bus, unsigned int cmd);
204 	/* get a response from the last command */
205 	int (*get_response)(struct hdac_bus *bus, unsigned int addr,
206 			    unsigned int *res);
207 	/* control the link power  */
208 	int (*link_power)(struct hdac_bus *bus, bool enable);
209 };
210 
211 /*
212  * Lowlevel I/O operators
213  */
214 struct hdac_io_ops {
215 	/* mapped register accesses */
216 	void (*reg_writel)(u32 value, u32 __iomem *addr);
217 	u32 (*reg_readl)(u32 __iomem *addr);
218 	void (*reg_writew)(u16 value, u16 __iomem *addr);
219 	u16 (*reg_readw)(u16 __iomem *addr);
220 	void (*reg_writeb)(u8 value, u8 __iomem *addr);
221 	u8 (*reg_readb)(u8 __iomem *addr);
222 	/* Allocation ops */
223 	int (*dma_alloc_pages)(struct hdac_bus *bus, int type, size_t size,
224 			       struct snd_dma_buffer *buf);
225 	void (*dma_free_pages)(struct hdac_bus *bus,
226 			       struct snd_dma_buffer *buf);
227 };
228 
229 #define HDA_UNSOL_QUEUE_SIZE	64
230 #define HDA_MAX_CODECS		8	/* limit by controller side */
231 
232 /*
233  * CORB/RIRB
234  *
235  * Each CORB entry is 4byte, RIRB is 8byte
236  */
237 struct hdac_rb {
238 	__le32 *buf;		/* virtual address of CORB/RIRB buffer */
239 	dma_addr_t addr;	/* physical address of CORB/RIRB buffer */
240 	unsigned short rp, wp;	/* RIRB read/write pointers */
241 	int cmds[HDA_MAX_CODECS];	/* number of pending requests */
242 	u32 res[HDA_MAX_CODECS];	/* last read value */
243 };
244 
245 /*
246  * HD-audio bus base driver
247  *
248  * @ppcap: pp capabilities pointer
249  * @spbcap: SPIB capabilities pointer
250  * @mlcap: MultiLink capabilities pointer
251  * @gtscap: gts capabilities pointer
252  * @drsmcap: dma resume capabilities pointer
253  */
254 struct hdac_bus {
255 	struct device *dev;
256 	const struct hdac_bus_ops *ops;
257 	const struct hdac_io_ops *io_ops;
258 
259 	/* h/w resources */
260 	unsigned long addr;
261 	void __iomem *remap_addr;
262 	int irq;
263 
264 	void __iomem *ppcap;
265 	void __iomem *spbcap;
266 	void __iomem *mlcap;
267 	void __iomem *gtscap;
268 	void __iomem *drsmcap;
269 
270 	/* codec linked list */
271 	struct list_head codec_list;
272 	unsigned int num_codecs;
273 
274 	/* link caddr -> codec */
275 	struct hdac_device *caddr_tbl[HDA_MAX_CODEC_ADDRESS + 1];
276 
277 	/* unsolicited event queue */
278 	u32 unsol_queue[HDA_UNSOL_QUEUE_SIZE * 2]; /* ring buffer */
279 	unsigned int unsol_rp, unsol_wp;
280 	struct work_struct unsol_work;
281 
282 	/* bit flags of detected codecs */
283 	unsigned long codec_mask;
284 
285 	/* bit flags of powered codecs */
286 	unsigned long codec_powered;
287 
288 	/* CORB/RIRB */
289 	struct hdac_rb corb;
290 	struct hdac_rb rirb;
291 	unsigned int last_cmd[HDA_MAX_CODECS];	/* last sent command */
292 
293 	/* CORB/RIRB and position buffers */
294 	struct snd_dma_buffer rb;
295 	struct snd_dma_buffer posbuf;
296 
297 	/* hdac_stream linked list */
298 	struct list_head stream_list;
299 
300 	/* operation state */
301 	bool chip_init:1;		/* h/w initialized */
302 
303 	/* behavior flags */
304 	bool sync_write:1;		/* sync after verb write */
305 	bool use_posbuf:1;		/* use position buffer */
306 	bool snoop:1;			/* enable snooping */
307 	bool align_bdle_4k:1;		/* BDLE align 4K boundary */
308 	bool reverse_assign:1;		/* assign devices in reverse order */
309 	bool corbrp_self_clear:1;	/* CORBRP clears itself after reset */
310 
311 	int bdl_pos_adj;		/* BDL position adjustment */
312 
313 	/* locks */
314 	spinlock_t reg_lock;
315 	struct mutex cmd_mutex;
316 
317 	/* i915 component interface */
318 	struct i915_audio_component *audio_component;
319 	int i915_power_refcount;
320 };
321 
322 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
323 		      const struct hdac_bus_ops *ops,
324 		      const struct hdac_io_ops *io_ops);
325 void snd_hdac_bus_exit(struct hdac_bus *bus);
326 int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
327 			   unsigned int cmd, unsigned int *res);
328 int snd_hdac_bus_exec_verb_unlocked(struct hdac_bus *bus, unsigned int addr,
329 				    unsigned int cmd, unsigned int *res);
330 void snd_hdac_bus_queue_event(struct hdac_bus *bus, u32 res, u32 res_ex);
331 
332 int snd_hdac_bus_add_device(struct hdac_bus *bus, struct hdac_device *codec);
333 void snd_hdac_bus_remove_device(struct hdac_bus *bus,
334 				struct hdac_device *codec);
335 
336 static inline void snd_hdac_codec_link_up(struct hdac_device *codec)
337 {
338 	set_bit(codec->addr, &codec->bus->codec_powered);
339 }
340 
341 static inline void snd_hdac_codec_link_down(struct hdac_device *codec)
342 {
343 	clear_bit(codec->addr, &codec->bus->codec_powered);
344 }
345 
346 int snd_hdac_bus_send_cmd(struct hdac_bus *bus, unsigned int val);
347 int snd_hdac_bus_get_response(struct hdac_bus *bus, unsigned int addr,
348 			      unsigned int *res);
349 int snd_hdac_bus_parse_capabilities(struct hdac_bus *bus);
350 int snd_hdac_link_power(struct hdac_device *codec, bool enable);
351 
352 bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset);
353 void snd_hdac_bus_stop_chip(struct hdac_bus *bus);
354 void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus);
355 void snd_hdac_bus_stop_cmd_io(struct hdac_bus *bus);
356 void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus);
357 void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus);
358 
359 void snd_hdac_bus_update_rirb(struct hdac_bus *bus);
360 int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
361 				    void (*ack)(struct hdac_bus *,
362 						struct hdac_stream *));
363 
364 int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus);
365 void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus);
366 
367 /*
368  * macros for easy use
369  */
370 #define _snd_hdac_chip_writeb(chip, reg, value) \
371 	((chip)->io_ops->reg_writeb(value, (chip)->remap_addr + (reg)))
372 #define _snd_hdac_chip_readb(chip, reg) \
373 	((chip)->io_ops->reg_readb((chip)->remap_addr + (reg)))
374 #define _snd_hdac_chip_writew(chip, reg, value) \
375 	((chip)->io_ops->reg_writew(value, (chip)->remap_addr + (reg)))
376 #define _snd_hdac_chip_readw(chip, reg) \
377 	((chip)->io_ops->reg_readw((chip)->remap_addr + (reg)))
378 #define _snd_hdac_chip_writel(chip, reg, value) \
379 	((chip)->io_ops->reg_writel(value, (chip)->remap_addr + (reg)))
380 #define _snd_hdac_chip_readl(chip, reg) \
381 	((chip)->io_ops->reg_readl((chip)->remap_addr + (reg)))
382 
383 /* read/write a register, pass without AZX_REG_ prefix */
384 #define snd_hdac_chip_writel(chip, reg, value) \
385 	_snd_hdac_chip_writel(chip, AZX_REG_ ## reg, value)
386 #define snd_hdac_chip_writew(chip, reg, value) \
387 	_snd_hdac_chip_writew(chip, AZX_REG_ ## reg, value)
388 #define snd_hdac_chip_writeb(chip, reg, value) \
389 	_snd_hdac_chip_writeb(chip, AZX_REG_ ## reg, value)
390 #define snd_hdac_chip_readl(chip, reg) \
391 	_snd_hdac_chip_readl(chip, AZX_REG_ ## reg)
392 #define snd_hdac_chip_readw(chip, reg) \
393 	_snd_hdac_chip_readw(chip, AZX_REG_ ## reg)
394 #define snd_hdac_chip_readb(chip, reg) \
395 	_snd_hdac_chip_readb(chip, AZX_REG_ ## reg)
396 
397 /* update a register, pass without AZX_REG_ prefix */
398 #define snd_hdac_chip_updatel(chip, reg, mask, val) \
399 	snd_hdac_chip_writel(chip, reg, \
400 			     (snd_hdac_chip_readl(chip, reg) & ~(mask)) | (val))
401 #define snd_hdac_chip_updatew(chip, reg, mask, val) \
402 	snd_hdac_chip_writew(chip, reg, \
403 			     (snd_hdac_chip_readw(chip, reg) & ~(mask)) | (val))
404 #define snd_hdac_chip_updateb(chip, reg, mask, val) \
405 	snd_hdac_chip_writeb(chip, reg, \
406 			     (snd_hdac_chip_readb(chip, reg) & ~(mask)) | (val))
407 
408 /*
409  * HD-audio stream
410  */
411 struct hdac_stream {
412 	struct hdac_bus *bus;
413 	struct snd_dma_buffer bdl; /* BDL buffer */
414 	__le32 *posbuf;		/* position buffer pointer */
415 	int direction;		/* playback / capture (SNDRV_PCM_STREAM_*) */
416 
417 	unsigned int bufsize;	/* size of the play buffer in bytes */
418 	unsigned int period_bytes; /* size of the period in bytes */
419 	unsigned int frags;	/* number for period in the play buffer */
420 	unsigned int fifo_size;	/* FIFO size */
421 
422 	void __iomem *sd_addr;	/* stream descriptor pointer */
423 
424 	u32 sd_int_sta_mask;	/* stream int status mask */
425 
426 	/* pcm support */
427 	struct snd_pcm_substream *substream;	/* assigned substream,
428 						 * set in PCM open
429 						 */
430 	unsigned int format_val;	/* format value to be set in the
431 					 * controller and the codec
432 					 */
433 	unsigned char stream_tag;	/* assigned stream */
434 	unsigned char index;		/* stream index */
435 	int assigned_key;		/* last device# key assigned to */
436 
437 	bool opened:1;
438 	bool running:1;
439 	bool prepared:1;
440 	bool no_period_wakeup:1;
441 	bool locked:1;
442 
443 	/* timestamp */
444 	unsigned long start_wallclk;	/* start + minimum wallclk */
445 	unsigned long period_wallclk;	/* wallclk for period */
446 	struct timecounter  tc;
447 	struct cyclecounter cc;
448 	int delay_negative_threshold;
449 
450 	struct list_head list;
451 #ifdef CONFIG_SND_HDA_DSP_LOADER
452 	/* DSP access mutex */
453 	struct mutex dsp_mutex;
454 #endif
455 };
456 
457 void snd_hdac_stream_init(struct hdac_bus *bus, struct hdac_stream *azx_dev,
458 			  int idx, int direction, int tag);
459 struct hdac_stream *snd_hdac_stream_assign(struct hdac_bus *bus,
460 					   struct snd_pcm_substream *substream);
461 void snd_hdac_stream_release(struct hdac_stream *azx_dev);
462 struct hdac_stream *snd_hdac_get_stream(struct hdac_bus *bus,
463 					int dir, int stream_tag);
464 
465 int snd_hdac_stream_setup(struct hdac_stream *azx_dev);
466 void snd_hdac_stream_cleanup(struct hdac_stream *azx_dev);
467 int snd_hdac_stream_setup_periods(struct hdac_stream *azx_dev);
468 int snd_hdac_stream_set_params(struct hdac_stream *azx_dev,
469 				unsigned int format_val);
470 void snd_hdac_stream_start(struct hdac_stream *azx_dev, bool fresh_start);
471 void snd_hdac_stream_clear(struct hdac_stream *azx_dev);
472 void snd_hdac_stream_stop(struct hdac_stream *azx_dev);
473 void snd_hdac_stream_reset(struct hdac_stream *azx_dev);
474 void snd_hdac_stream_sync_trigger(struct hdac_stream *azx_dev, bool set,
475 				  unsigned int streams, unsigned int reg);
476 void snd_hdac_stream_sync(struct hdac_stream *azx_dev, bool start,
477 			  unsigned int streams);
478 void snd_hdac_stream_timecounter_init(struct hdac_stream *azx_dev,
479 				      unsigned int streams);
480 /*
481  * macros for easy use
482  */
483 #define _snd_hdac_stream_write(type, dev, reg, value)			\
484 	((dev)->bus->io_ops->reg_write ## type(value, (dev)->sd_addr + (reg)))
485 #define _snd_hdac_stream_read(type, dev, reg)				\
486 	((dev)->bus->io_ops->reg_read ## type((dev)->sd_addr + (reg)))
487 
488 /* read/write a register, pass without AZX_REG_ prefix */
489 #define snd_hdac_stream_writel(dev, reg, value) \
490 	_snd_hdac_stream_write(l, dev, AZX_REG_ ## reg, value)
491 #define snd_hdac_stream_writew(dev, reg, value) \
492 	_snd_hdac_stream_write(w, dev, AZX_REG_ ## reg, value)
493 #define snd_hdac_stream_writeb(dev, reg, value) \
494 	_snd_hdac_stream_write(b, dev, AZX_REG_ ## reg, value)
495 #define snd_hdac_stream_readl(dev, reg) \
496 	_snd_hdac_stream_read(l, dev, AZX_REG_ ## reg)
497 #define snd_hdac_stream_readw(dev, reg) \
498 	_snd_hdac_stream_read(w, dev, AZX_REG_ ## reg)
499 #define snd_hdac_stream_readb(dev, reg) \
500 	_snd_hdac_stream_read(b, dev, AZX_REG_ ## reg)
501 
502 /* update a register, pass without AZX_REG_ prefix */
503 #define snd_hdac_stream_updatel(dev, reg, mask, val) \
504 	snd_hdac_stream_writel(dev, reg, \
505 			       (snd_hdac_stream_readl(dev, reg) & \
506 				~(mask)) | (val))
507 #define snd_hdac_stream_updatew(dev, reg, mask, val) \
508 	snd_hdac_stream_writew(dev, reg, \
509 			       (snd_hdac_stream_readw(dev, reg) & \
510 				~(mask)) | (val))
511 #define snd_hdac_stream_updateb(dev, reg, mask, val) \
512 	snd_hdac_stream_writeb(dev, reg, \
513 			       (snd_hdac_stream_readb(dev, reg) & \
514 				~(mask)) | (val))
515 
516 #ifdef CONFIG_SND_HDA_DSP_LOADER
517 /* DSP lock helpers */
518 #define snd_hdac_dsp_lock_init(dev)	mutex_init(&(dev)->dsp_mutex)
519 #define snd_hdac_dsp_lock(dev)		mutex_lock(&(dev)->dsp_mutex)
520 #define snd_hdac_dsp_unlock(dev)	mutex_unlock(&(dev)->dsp_mutex)
521 #define snd_hdac_stream_is_locked(dev)	((dev)->locked)
522 /* DSP loader helpers */
523 int snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
524 			 unsigned int byte_size, struct snd_dma_buffer *bufp);
525 void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start);
526 void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
527 			  struct snd_dma_buffer *dmab);
528 #else /* CONFIG_SND_HDA_DSP_LOADER */
529 #define snd_hdac_dsp_lock_init(dev)	do {} while (0)
530 #define snd_hdac_dsp_lock(dev)		do {} while (0)
531 #define snd_hdac_dsp_unlock(dev)	do {} while (0)
532 #define snd_hdac_stream_is_locked(dev)	0
533 
534 static inline int
535 snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
536 		     unsigned int byte_size, struct snd_dma_buffer *bufp)
537 {
538 	return 0;
539 }
540 
541 static inline void snd_hdac_dsp_trigger(struct hdac_stream *azx_dev, bool start)
542 {
543 }
544 
545 static inline void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
546 					struct snd_dma_buffer *dmab)
547 {
548 }
549 #endif /* CONFIG_SND_HDA_DSP_LOADER */
550 
551 
552 /*
553  * generic array helpers
554  */
555 void *snd_array_new(struct snd_array *array);
556 void snd_array_free(struct snd_array *array);
557 static inline void snd_array_init(struct snd_array *array, unsigned int size,
558 				  unsigned int align)
559 {
560 	array->elem_size = size;
561 	array->alloc_align = align;
562 }
563 
564 static inline void *snd_array_elem(struct snd_array *array, unsigned int idx)
565 {
566 	return array->list + idx * array->elem_size;
567 }
568 
569 static inline unsigned int snd_array_index(struct snd_array *array, void *ptr)
570 {
571 	return (unsigned long)(ptr - array->list) / array->elem_size;
572 }
573 
574 /* a helper macro to iterate for each snd_array element */
575 #define snd_array_for_each(array, idx, ptr) \
576 	for ((idx) = 0, (ptr) = (array)->list; (idx) < (array)->used; \
577 	     (ptr) = snd_array_elem(array, ++(idx)))
578 
579 #endif /* __SOUND_HDAUDIO_H */
580