1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * McBSP Sidetone support
4 *
5 * Copyright (C) 2004 Nokia Corporation
6 * Author: Samuel Ortiz <samuel.ortiz@nokia.com>
7 *
8 * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
9 * Peter Ujfalusi <peter.ujfalusi@ti.com>
10 */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/device.h>
15 #include <linux/platform_device.h>
16 #include <linux/interrupt.h>
17 #include <linux/err.h>
18 #include <linux/clk.h>
19 #include <linux/delay.h>
20 #include <linux/io.h>
21 #include <linux/slab.h>
22
23 #include "omap-mcbsp.h"
24 #include "omap-mcbsp-priv.h"
25
26 /* OMAP3 sidetone control registers */
27 #define OMAP_ST_REG_REV 0x00
28 #define OMAP_ST_REG_SYSCONFIG 0x10
29 #define OMAP_ST_REG_IRQSTATUS 0x18
30 #define OMAP_ST_REG_IRQENABLE 0x1C
31 #define OMAP_ST_REG_SGAINCR 0x24
32 #define OMAP_ST_REG_SFIRCR 0x28
33 #define OMAP_ST_REG_SSELCR 0x2C
34
35 /********************** McBSP SSELCR bit definitions ***********************/
36 #define SIDETONEEN BIT(10)
37
38 /********************** McBSP Sidetone SYSCONFIG bit definitions ***********/
39 #define ST_AUTOIDLE BIT(0)
40
41 /********************** McBSP Sidetone SGAINCR bit definitions *************/
42 #define ST_CH0GAIN(value) ((value) & 0xffff) /* Bits 0:15 */
43 #define ST_CH1GAIN(value) (((value) & 0xffff) << 16) /* Bits 16:31 */
44
45 /********************** McBSP Sidetone SFIRCR bit definitions **************/
46 #define ST_FIRCOEFF(value) ((value) & 0xffff) /* Bits 0:15 */
47
48 /********************** McBSP Sidetone SSELCR bit definitions **************/
49 #define ST_SIDETONEEN BIT(0)
50 #define ST_COEFFWREN BIT(1)
51 #define ST_COEFFWRDONE BIT(2)
52
53 struct omap_mcbsp_st_data {
54 void __iomem *io_base_st;
55 struct clk *mcbsp_iclk;
56 bool running;
57 bool enabled;
58 s16 taps[128]; /* Sidetone filter coefficients */
59 int nr_taps; /* Number of filter coefficients in use */
60 s16 ch0gain;
61 s16 ch1gain;
62 };
63
omap_mcbsp_st_write(struct omap_mcbsp * mcbsp,u16 reg,u32 val)64 static void omap_mcbsp_st_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
65 {
66 writel_relaxed(val, mcbsp->st_data->io_base_st + reg);
67 }
68
omap_mcbsp_st_read(struct omap_mcbsp * mcbsp,u16 reg)69 static int omap_mcbsp_st_read(struct omap_mcbsp *mcbsp, u16 reg)
70 {
71 return readl_relaxed(mcbsp->st_data->io_base_st + reg);
72 }
73
74 #define MCBSP_ST_READ(mcbsp, reg) omap_mcbsp_st_read(mcbsp, OMAP_ST_REG_##reg)
75 #define MCBSP_ST_WRITE(mcbsp, reg, val) \
76 omap_mcbsp_st_write(mcbsp, OMAP_ST_REG_##reg, val)
77
omap_mcbsp_st_on(struct omap_mcbsp * mcbsp)78 static void omap_mcbsp_st_on(struct omap_mcbsp *mcbsp)
79 {
80 unsigned int w;
81
82 if (mcbsp->pdata->force_ick_on)
83 mcbsp->pdata->force_ick_on(mcbsp->st_data->mcbsp_iclk, true);
84
85 /* Disable Sidetone clock auto-gating for normal operation */
86 w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
87 MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w & ~(ST_AUTOIDLE));
88
89 /* Enable McBSP Sidetone */
90 w = MCBSP_READ(mcbsp, SSELCR);
91 MCBSP_WRITE(mcbsp, SSELCR, w | SIDETONEEN);
92
93 /* Enable Sidetone from Sidetone Core */
94 w = MCBSP_ST_READ(mcbsp, SSELCR);
95 MCBSP_ST_WRITE(mcbsp, SSELCR, w | ST_SIDETONEEN);
96 }
97
omap_mcbsp_st_off(struct omap_mcbsp * mcbsp)98 static void omap_mcbsp_st_off(struct omap_mcbsp *mcbsp)
99 {
100 unsigned int w;
101
102 w = MCBSP_ST_READ(mcbsp, SSELCR);
103 MCBSP_ST_WRITE(mcbsp, SSELCR, w & ~(ST_SIDETONEEN));
104
105 w = MCBSP_READ(mcbsp, SSELCR);
106 MCBSP_WRITE(mcbsp, SSELCR, w & ~(SIDETONEEN));
107
108 /* Enable Sidetone clock auto-gating to reduce power consumption */
109 w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
110 MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w | ST_AUTOIDLE);
111
112 if (mcbsp->pdata->force_ick_on)
113 mcbsp->pdata->force_ick_on(mcbsp->st_data->mcbsp_iclk, false);
114 }
115
omap_mcbsp_st_fir_write(struct omap_mcbsp * mcbsp,s16 * fir)116 static void omap_mcbsp_st_fir_write(struct omap_mcbsp *mcbsp, s16 *fir)
117 {
118 u16 val, i;
119
120 val = MCBSP_ST_READ(mcbsp, SSELCR);
121
122 if (val & ST_COEFFWREN)
123 MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
124
125 MCBSP_ST_WRITE(mcbsp, SSELCR, val | ST_COEFFWREN);
126
127 for (i = 0; i < 128; i++)
128 MCBSP_ST_WRITE(mcbsp, SFIRCR, fir[i]);
129
130 i = 0;
131
132 val = MCBSP_ST_READ(mcbsp, SSELCR);
133 while (!(val & ST_COEFFWRDONE) && (++i < 1000))
134 val = MCBSP_ST_READ(mcbsp, SSELCR);
135
136 MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
137
138 if (i == 1000)
139 dev_err(mcbsp->dev, "McBSP FIR load error!\n");
140 }
141
omap_mcbsp_st_chgain(struct omap_mcbsp * mcbsp)142 static void omap_mcbsp_st_chgain(struct omap_mcbsp *mcbsp)
143 {
144 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
145
146 MCBSP_ST_WRITE(mcbsp, SGAINCR, ST_CH0GAIN(st_data->ch0gain) |
147 ST_CH1GAIN(st_data->ch1gain));
148 }
149
omap_mcbsp_st_set_chgain(struct omap_mcbsp * mcbsp,int channel,s16 chgain)150 static int omap_mcbsp_st_set_chgain(struct omap_mcbsp *mcbsp, int channel,
151 s16 chgain)
152 {
153 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
154 int ret = 0;
155
156 if (!st_data)
157 return -ENOENT;
158
159 spin_lock_irq(&mcbsp->lock);
160 if (channel == 0)
161 st_data->ch0gain = chgain;
162 else if (channel == 1)
163 st_data->ch1gain = chgain;
164 else
165 ret = -EINVAL;
166
167 if (st_data->enabled)
168 omap_mcbsp_st_chgain(mcbsp);
169 spin_unlock_irq(&mcbsp->lock);
170
171 return ret;
172 }
173
omap_mcbsp_st_get_chgain(struct omap_mcbsp * mcbsp,int channel,s16 * chgain)174 static int omap_mcbsp_st_get_chgain(struct omap_mcbsp *mcbsp, int channel,
175 s16 *chgain)
176 {
177 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
178 int ret = 0;
179
180 if (!st_data)
181 return -ENOENT;
182
183 spin_lock_irq(&mcbsp->lock);
184 if (channel == 0)
185 *chgain = st_data->ch0gain;
186 else if (channel == 1)
187 *chgain = st_data->ch1gain;
188 else
189 ret = -EINVAL;
190 spin_unlock_irq(&mcbsp->lock);
191
192 return ret;
193 }
194
omap_mcbsp_st_enable(struct omap_mcbsp * mcbsp)195 static int omap_mcbsp_st_enable(struct omap_mcbsp *mcbsp)
196 {
197 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
198
199 if (!st_data)
200 return -ENODEV;
201
202 spin_lock_irq(&mcbsp->lock);
203 st_data->enabled = 1;
204 omap_mcbsp_st_start(mcbsp);
205 spin_unlock_irq(&mcbsp->lock);
206
207 return 0;
208 }
209
omap_mcbsp_st_disable(struct omap_mcbsp * mcbsp)210 static int omap_mcbsp_st_disable(struct omap_mcbsp *mcbsp)
211 {
212 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
213 int ret = 0;
214
215 if (!st_data)
216 return -ENODEV;
217
218 spin_lock_irq(&mcbsp->lock);
219 omap_mcbsp_st_stop(mcbsp);
220 st_data->enabled = 0;
221 spin_unlock_irq(&mcbsp->lock);
222
223 return ret;
224 }
225
omap_mcbsp_st_is_enabled(struct omap_mcbsp * mcbsp)226 static int omap_mcbsp_st_is_enabled(struct omap_mcbsp *mcbsp)
227 {
228 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
229
230 if (!st_data)
231 return -ENODEV;
232
233 return st_data->enabled;
234 }
235
st_taps_show(struct device * dev,struct device_attribute * attr,char * buf)236 static ssize_t st_taps_show(struct device *dev,
237 struct device_attribute *attr, char *buf)
238 {
239 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
240 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
241 ssize_t status = 0;
242 int i;
243
244 spin_lock_irq(&mcbsp->lock);
245 for (i = 0; i < st_data->nr_taps; i++)
246 status += sysfs_emit_at(buf, status, (i ? ", %d" : "%d"),
247 st_data->taps[i]);
248 if (i)
249 status += sysfs_emit_at(buf, status, "\n");
250 spin_unlock_irq(&mcbsp->lock);
251
252 return status;
253 }
254
st_taps_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t size)255 static ssize_t st_taps_store(struct device *dev,
256 struct device_attribute *attr,
257 const char *buf, size_t size)
258 {
259 struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
260 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
261 int val, tmp, status, i = 0;
262
263 spin_lock_irq(&mcbsp->lock);
264 memset(st_data->taps, 0, sizeof(st_data->taps));
265 st_data->nr_taps = 0;
266
267 do {
268 status = sscanf(buf, "%d%n", &val, &tmp);
269 if (status < 0 || status == 0) {
270 size = -EINVAL;
271 goto out;
272 }
273 if (val < -32768 || val > 32767) {
274 size = -EINVAL;
275 goto out;
276 }
277 st_data->taps[i++] = val;
278 buf += tmp;
279 if (*buf != ',')
280 break;
281 buf++;
282 } while (1);
283
284 st_data->nr_taps = i;
285
286 out:
287 spin_unlock_irq(&mcbsp->lock);
288
289 return size;
290 }
291
292 static DEVICE_ATTR_RW(st_taps);
293
294 static const struct attribute *sidetone_attrs[] = {
295 &dev_attr_st_taps.attr,
296 NULL,
297 };
298
299 static const struct attribute_group sidetone_attr_group = {
300 .attrs = (struct attribute **)sidetone_attrs,
301 };
302
omap_mcbsp_st_start(struct omap_mcbsp * mcbsp)303 int omap_mcbsp_st_start(struct omap_mcbsp *mcbsp)
304 {
305 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
306
307 if (st_data->enabled && !st_data->running) {
308 omap_mcbsp_st_fir_write(mcbsp, st_data->taps);
309 omap_mcbsp_st_chgain(mcbsp);
310
311 if (!mcbsp->free) {
312 omap_mcbsp_st_on(mcbsp);
313 st_data->running = 1;
314 }
315 }
316
317 return 0;
318 }
319
omap_mcbsp_st_stop(struct omap_mcbsp * mcbsp)320 int omap_mcbsp_st_stop(struct omap_mcbsp *mcbsp)
321 {
322 struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
323
324 if (st_data->running) {
325 if (!mcbsp->free) {
326 omap_mcbsp_st_off(mcbsp);
327 st_data->running = 0;
328 }
329 }
330
331 return 0;
332 }
333
omap_mcbsp_st_init(struct platform_device * pdev)334 int omap_mcbsp_st_init(struct platform_device *pdev)
335 {
336 struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
337 struct omap_mcbsp_st_data *st_data;
338 struct resource *res;
339 int ret;
340
341 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sidetone");
342 if (!res)
343 return 0;
344
345 st_data = devm_kzalloc(mcbsp->dev, sizeof(*mcbsp->st_data), GFP_KERNEL);
346 if (!st_data)
347 return -ENOMEM;
348
349 st_data->mcbsp_iclk = devm_clk_get(mcbsp->dev, "ick");
350 if (IS_ERR(st_data->mcbsp_iclk)) {
351 dev_warn(mcbsp->dev,
352 "Failed to get ick, sidetone might be broken\n");
353 st_data->mcbsp_iclk = NULL;
354 }
355
356 st_data->io_base_st = devm_ioremap(mcbsp->dev, res->start,
357 resource_size(res));
358 if (!st_data->io_base_st)
359 return -ENOMEM;
360
361 ret = devm_device_add_group(mcbsp->dev, &sidetone_attr_group);
362 if (ret)
363 return ret;
364
365 mcbsp->st_data = st_data;
366
367 return 0;
368 }
369
omap_mcbsp_st_info_volsw(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)370 static int omap_mcbsp_st_info_volsw(struct snd_kcontrol *kcontrol,
371 struct snd_ctl_elem_info *uinfo)
372 {
373 struct soc_mixer_control *mc =
374 (struct soc_mixer_control *)kcontrol->private_value;
375 int max = mc->max;
376 int min = mc->min;
377
378 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
379 uinfo->count = 1;
380 uinfo->value.integer.min = min;
381 uinfo->value.integer.max = max;
382 return 0;
383 }
384
385 #define OMAP_MCBSP_ST_CHANNEL_VOLUME(channel) \
386 static int \
387 omap_mcbsp_set_st_ch##channel##_volume(struct snd_kcontrol *kc, \
388 struct snd_ctl_elem_value *uc) \
389 { \
390 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kc); \
391 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); \
392 struct soc_mixer_control *mc = \
393 (struct soc_mixer_control *)kc->private_value; \
394 int max = mc->max; \
395 int min = mc->min; \
396 int val = uc->value.integer.value[0]; \
397 \
398 if (val < min || val > max) \
399 return -EINVAL; \
400 \
401 /* OMAP McBSP implementation uses index values 0..4 */ \
402 return omap_mcbsp_st_set_chgain(mcbsp, channel, val); \
403 } \
404 \
405 static int \
406 omap_mcbsp_get_st_ch##channel##_volume(struct snd_kcontrol *kc, \
407 struct snd_ctl_elem_value *uc) \
408 { \
409 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kc); \
410 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai); \
411 s16 chgain; \
412 \
413 if (omap_mcbsp_st_get_chgain(mcbsp, channel, &chgain)) \
414 return -EAGAIN; \
415 \
416 uc->value.integer.value[0] = chgain; \
417 return 0; \
418 }
419
420 OMAP_MCBSP_ST_CHANNEL_VOLUME(0)
421 OMAP_MCBSP_ST_CHANNEL_VOLUME(1)
422
omap_mcbsp_st_put_mode(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)423 static int omap_mcbsp_st_put_mode(struct snd_kcontrol *kcontrol,
424 struct snd_ctl_elem_value *ucontrol)
425 {
426 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
427 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
428 u8 value = ucontrol->value.integer.value[0];
429
430 if (value == omap_mcbsp_st_is_enabled(mcbsp))
431 return 0;
432
433 if (value)
434 omap_mcbsp_st_enable(mcbsp);
435 else
436 omap_mcbsp_st_disable(mcbsp);
437
438 return 1;
439 }
440
omap_mcbsp_st_get_mode(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)441 static int omap_mcbsp_st_get_mode(struct snd_kcontrol *kcontrol,
442 struct snd_ctl_elem_value *ucontrol)
443 {
444 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
445 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
446
447 ucontrol->value.integer.value[0] = omap_mcbsp_st_is_enabled(mcbsp);
448 return 0;
449 }
450
451 #define OMAP_MCBSP_SOC_SINGLE_S16_EXT(xname, xmin, xmax, \
452 xhandler_get, xhandler_put) \
453 { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
454 .info = omap_mcbsp_st_info_volsw, \
455 .get = xhandler_get, .put = xhandler_put, \
456 .private_value = (unsigned long)&(struct soc_mixer_control) \
457 {.min = xmin, .max = xmax} }
458
459 #define OMAP_MCBSP_ST_CONTROLS(port) \
460 static const struct snd_kcontrol_new omap_mcbsp##port##_st_controls[] = { \
461 SOC_SINGLE_EXT("McBSP" #port " Sidetone Switch", 1, 0, 1, 0, \
462 omap_mcbsp_st_get_mode, omap_mcbsp_st_put_mode), \
463 OMAP_MCBSP_SOC_SINGLE_S16_EXT("McBSP" #port " Sidetone Channel 0 Volume", \
464 -32768, 32767, \
465 omap_mcbsp_get_st_ch0_volume, \
466 omap_mcbsp_set_st_ch0_volume), \
467 OMAP_MCBSP_SOC_SINGLE_S16_EXT("McBSP" #port " Sidetone Channel 1 Volume", \
468 -32768, 32767, \
469 omap_mcbsp_get_st_ch1_volume, \
470 omap_mcbsp_set_st_ch1_volume), \
471 }
472
473 OMAP_MCBSP_ST_CONTROLS(2);
474 OMAP_MCBSP_ST_CONTROLS(3);
475
omap_mcbsp_st_add_controls(struct snd_soc_pcm_runtime * rtd,int port_id)476 int omap_mcbsp_st_add_controls(struct snd_soc_pcm_runtime *rtd, int port_id)
477 {
478 struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
479 struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
480
481 if (!mcbsp->st_data) {
482 dev_warn(mcbsp->dev, "No sidetone data for port\n");
483 return 0;
484 }
485
486 switch (port_id) {
487 case 2: /* McBSP 2 */
488 return snd_soc_add_dai_controls(cpu_dai,
489 omap_mcbsp2_st_controls,
490 ARRAY_SIZE(omap_mcbsp2_st_controls));
491 case 3: /* McBSP 3 */
492 return snd_soc_add_dai_controls(cpu_dai,
493 omap_mcbsp3_st_controls,
494 ARRAY_SIZE(omap_mcbsp3_st_controls));
495 default:
496 dev_err(mcbsp->dev, "Port %d not supported\n", port_id);
497 break;
498 }
499
500 return -EINVAL;
501 }
502 EXPORT_SYMBOL_GPL(omap_mcbsp_st_add_controls);
503