1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * hdac-ext-controller.c - HD-audio extended controller functions.
4 *
5 * Copyright (C) 2014-2015 Intel Corp
6 * Author: Jeeja KP <jeeja.kp@intel.com>
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10 */
11
12 #include <linux/delay.h>
13 #include <linux/slab.h>
14 #include <sound/hda_register.h>
15 #include <sound/hdaudio_ext.h>
16
17 /*
18 * processing pipe helpers - these helpers are useful for dealing with HDA
19 * new capability of processing pipelines
20 */
21
22 /**
23 * snd_hdac_ext_bus_ppcap_enable - enable/disable processing pipe capability
24 * @bus: the pointer to HDAC bus object
25 * @enable: flag to turn on/off the capability
26 */
27 void snd_hdac_ext_bus_ppcap_enable(struct hdac_bus *bus, bool enable)
28 {
29
30 if (!bus->ppcap) {
31 dev_err(bus->dev, "Address of PP capability is NULL");
32 return;
33 }
34
35 if (enable)
36 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
37 AZX_PPCTL_GPROCEN, AZX_PPCTL_GPROCEN);
38 else
39 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
40 AZX_PPCTL_GPROCEN, 0);
41 }
42 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_enable);
43
44 /**
45 * snd_hdac_ext_bus_ppcap_int_enable - ppcap interrupt enable/disable
46 * @bus: the pointer to HDAC bus object
47 * @enable: flag to enable/disable interrupt
48 */
49 void snd_hdac_ext_bus_ppcap_int_enable(struct hdac_bus *bus, bool enable)
50 {
51
52 if (!bus->ppcap) {
53 dev_err(bus->dev, "Address of PP capability is NULL\n");
54 return;
55 }
56
57 if (enable)
58 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
59 AZX_PPCTL_PIE, AZX_PPCTL_PIE);
60 else
61 snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL,
62 AZX_PPCTL_PIE, 0);
63 }
64 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_ppcap_int_enable);
65
66 /*
67 * Multilink helpers - these helpers are useful for dealing with HDA
68 * new multilink capability
69 */
70
71 /**
72 * snd_hdac_ext_bus_get_ml_capabilities - get multilink capability
73 * @bus: the pointer to HDAC bus object
74 *
75 * This will parse all links and read the mlink capabilities and add them
76 * in hlink_list of extended hdac bus
77 * Note: this will be freed on bus exit by driver
78 */
79 int snd_hdac_ext_bus_get_ml_capabilities(struct hdac_bus *bus)
80 {
81 int idx;
82 u32 link_count;
83 struct hdac_ext_link *hlink;
84
85 link_count = readl(bus->mlcap + AZX_REG_ML_MLCD) + 1;
86
87 dev_dbg(bus->dev, "In %s Link count: %d\n", __func__, link_count);
88
89 for (idx = 0; idx < link_count; idx++) {
90 hlink = kzalloc(sizeof(*hlink), GFP_KERNEL);
91 if (!hlink)
92 return -ENOMEM;
93 hlink->index = idx;
94 hlink->bus = bus;
95 hlink->ml_addr = bus->mlcap + AZX_ML_BASE +
96 (AZX_ML_INTERVAL * idx);
97 hlink->lcaps = readl(hlink->ml_addr + AZX_REG_ML_LCAP);
98 hlink->lsdiid = readw(hlink->ml_addr + AZX_REG_ML_LSDIID);
99
100 /* since link in On, update the ref */
101 hlink->ref_count = 1;
102
103 list_add_tail(&hlink->list, &bus->hlink_list);
104 }
105
106 return 0;
107 }
108 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_ml_capabilities);
109
110 /**
111 * snd_hdac_ext_link_free_all- free hdac extended link objects
112 *
113 * @bus: the pointer to HDAC bus object
114 */
115
116 void snd_hdac_ext_link_free_all(struct hdac_bus *bus)
117 {
118 struct hdac_ext_link *hlink;
119
120 while (!list_empty(&bus->hlink_list)) {
121 hlink = list_first_entry(&bus->hlink_list, struct hdac_ext_link, list);
122 list_del(&hlink->list);
123 kfree(hlink);
124 }
125 }
126 EXPORT_SYMBOL_GPL(snd_hdac_ext_link_free_all);
127
128 /**
129 * snd_hdac_ext_bus_get_hlink_by_addr - get hlink at specified address
130 * @bus: hlink's parent bus device
131 * @addr: codec device address
132 *
133 * Returns hlink object or NULL if matching hlink is not found.
134 */
135 struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_addr(struct hdac_bus *bus, int addr)
136 {
137 struct hdac_ext_link *hlink;
138
139 list_for_each_entry(hlink, &bus->hlink_list, list)
140 if (hlink->lsdiid & (0x1 << addr))
141 return hlink;
142 return NULL;
143 }
144 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_hlink_by_addr);
145
146 /**
147 * snd_hdac_ext_bus_get_hlink_by_name - get hlink based on codec name
148 * @bus: the pointer to HDAC bus object
149 * @codec_name: codec name
150 */
151 struct hdac_ext_link *snd_hdac_ext_bus_get_hlink_by_name(struct hdac_bus *bus,
152 const char *codec_name)
153 {
154 int bus_idx, addr;
155
156 if (sscanf(codec_name, "ehdaudio%dD%d", &bus_idx, &addr) != 2)
157 return NULL;
158 if (bus->idx != bus_idx)
159 return NULL;
160 if (addr < 0 || addr > 31)
161 return NULL;
162
163 return snd_hdac_ext_bus_get_hlink_by_addr(bus, addr);
164 }
165 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_get_hlink_by_name);
166
167 static int check_hdac_link_power_active(struct hdac_ext_link *hlink, bool enable)
168 {
169 int timeout;
170 u32 val;
171 int mask = (1 << AZX_ML_LCTL_CPA_SHIFT);
172
173 udelay(3);
174 timeout = 150;
175
176 do {
177 val = readl(hlink->ml_addr + AZX_REG_ML_LCTL);
178 if (enable) {
179 if (((val & mask) >> AZX_ML_LCTL_CPA_SHIFT))
180 return 0;
181 } else {
182 if (!((val & mask) >> AZX_ML_LCTL_CPA_SHIFT))
183 return 0;
184 }
185 udelay(3);
186 } while (--timeout);
187
188 return -EIO;
189 }
190
191 /**
192 * snd_hdac_ext_bus_link_power_up -power up hda link
193 * @hlink: HD-audio extended link
194 */
195 int snd_hdac_ext_bus_link_power_up(struct hdac_ext_link *hlink)
196 {
197 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL,
198 AZX_ML_LCTL_SPA, AZX_ML_LCTL_SPA);
199
200 return check_hdac_link_power_active(hlink, true);
201 }
202 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up);
203
204 /**
205 * snd_hdac_ext_bus_link_power_down -power down hda link
206 * @hlink: HD-audio extended link
207 */
208 int snd_hdac_ext_bus_link_power_down(struct hdac_ext_link *hlink)
209 {
210 snd_hdac_updatel(hlink->ml_addr, AZX_REG_ML_LCTL, AZX_ML_LCTL_SPA, 0);
211
212 return check_hdac_link_power_active(hlink, false);
213 }
214 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down);
215
216 /**
217 * snd_hdac_ext_bus_link_power_up_all -power up all hda link
218 * @bus: the pointer to HDAC bus object
219 */
220 int snd_hdac_ext_bus_link_power_up_all(struct hdac_bus *bus)
221 {
222 struct hdac_ext_link *hlink = NULL;
223 int ret;
224
225 list_for_each_entry(hlink, &bus->hlink_list, list) {
226 ret = snd_hdac_ext_bus_link_power_up(hlink);
227 if (ret < 0)
228 return ret;
229 }
230
231 return 0;
232 }
233 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_up_all);
234
235 /**
236 * snd_hdac_ext_bus_link_power_down_all -power down all hda link
237 * @bus: the pointer to HDAC bus object
238 */
239 int snd_hdac_ext_bus_link_power_down_all(struct hdac_bus *bus)
240 {
241 struct hdac_ext_link *hlink = NULL;
242 int ret;
243
244 list_for_each_entry(hlink, &bus->hlink_list, list) {
245 ret = snd_hdac_ext_bus_link_power_down(hlink);
246 if (ret < 0)
247 return ret;
248 }
249
250 return 0;
251 }
252 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power_down_all);
253
254 /**
255 * snd_hdac_ext_bus_link_set_stream_id - maps stream id to link output
256 * @link: HD-audio ext link to set up
257 * @stream: stream id
258 */
259 void snd_hdac_ext_bus_link_set_stream_id(struct hdac_ext_link *link,
260 int stream)
261 {
262 snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, (1 << stream), 1 << stream);
263 }
264 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_set_stream_id);
265
266 /**
267 * snd_hdac_ext_bus_link_clear_stream_id - maps stream id to link output
268 * @link: HD-audio ext link to set up
269 * @stream: stream id
270 */
271 void snd_hdac_ext_bus_link_clear_stream_id(struct hdac_ext_link *link,
272 int stream)
273 {
274 snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, (1 << stream), 0);
275 }
276 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_clear_stream_id);
277
278 int snd_hdac_ext_bus_link_get(struct hdac_bus *bus,
279 struct hdac_ext_link *hlink)
280 {
281 unsigned long codec_mask;
282 int ret = 0;
283
284 mutex_lock(&bus->lock);
285
286 /*
287 * if we move from 0 to 1, count will be 1 so power up this link
288 * as well, also check the dma status and trigger that
289 */
290 if (++hlink->ref_count == 1) {
291 if (!bus->cmd_dma_state) {
292 snd_hdac_bus_init_cmd_io(bus);
293 bus->cmd_dma_state = true;
294 }
295
296 ret = snd_hdac_ext_bus_link_power_up(hlink);
297
298 /*
299 * clear the register to invalidate all the output streams
300 */
301 snd_hdac_updatew(hlink->ml_addr, AZX_REG_ML_LOSIDV,
302 AZX_ML_LOSIDV_STREAM_MASK, 0);
303 /*
304 * wait for 521usec for codec to report status
305 * HDA spec section 4.3 - Codec Discovery
306 */
307 udelay(521);
308 codec_mask = snd_hdac_chip_readw(bus, STATESTS);
309 dev_dbg(bus->dev, "codec_mask = 0x%lx\n", codec_mask);
310 snd_hdac_chip_writew(bus, STATESTS, codec_mask);
311 if (!bus->codec_mask)
312 bus->codec_mask = codec_mask;
313 }
314
315 mutex_unlock(&bus->lock);
316 return ret;
317 }
318 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_get);
319
320 int snd_hdac_ext_bus_link_put(struct hdac_bus *bus,
321 struct hdac_ext_link *hlink)
322 {
323 int ret = 0;
324 struct hdac_ext_link *hlink_tmp;
325 bool link_up = false;
326
327 mutex_lock(&bus->lock);
328
329 /*
330 * if we move from 1 to 0, count will be 0
331 * so power down this link as well
332 */
333 if (--hlink->ref_count == 0) {
334 ret = snd_hdac_ext_bus_link_power_down(hlink);
335
336 /*
337 * now check if all links are off, if so turn off
338 * cmd dma as well
339 */
340 list_for_each_entry(hlink_tmp, &bus->hlink_list, list) {
341 if (hlink_tmp->ref_count) {
342 link_up = true;
343 break;
344 }
345 }
346
347 if (!link_up) {
348 snd_hdac_bus_stop_cmd_io(bus);
349 bus->cmd_dma_state = false;
350 }
351 }
352
353 mutex_unlock(&bus->lock);
354 return ret;
355 }
356 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_put);
357
358 static void hdac_ext_codec_link_up(struct hdac_device *codec)
359 {
360 const char *devname = dev_name(&codec->dev);
361 struct hdac_ext_link *hlink =
362 snd_hdac_ext_bus_get_hlink_by_name(codec->bus, devname);
363
364 if (hlink)
365 snd_hdac_ext_bus_link_get(codec->bus, hlink);
366 }
367
368 static void hdac_ext_codec_link_down(struct hdac_device *codec)
369 {
370 const char *devname = dev_name(&codec->dev);
371 struct hdac_ext_link *hlink =
372 snd_hdac_ext_bus_get_hlink_by_name(codec->bus, devname);
373
374 if (hlink)
375 snd_hdac_ext_bus_link_put(codec->bus, hlink);
376 }
377
378 void snd_hdac_ext_bus_link_power(struct hdac_device *codec, bool enable)
379 {
380 struct hdac_bus *bus = codec->bus;
381 bool oldstate = test_bit(codec->addr, &bus->codec_powered);
382
383 if (enable == oldstate)
384 return;
385
386 snd_hdac_bus_link_power(codec, enable);
387
388 if (enable)
389 hdac_ext_codec_link_up(codec);
390 else
391 hdac_ext_codec_link_down(codec);
392 }
393 EXPORT_SYMBOL_GPL(snd_hdac_ext_bus_link_power);
394
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.