Thomas Gleixner | 1a59d1b8 | 2019-05-27 08:55:05 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 2 | /* |
| 3 | * sh_dac_audio.c - SuperH DAC audio driver for ALSA |
| 4 | * |
| 5 | * Copyright (c) 2009 by Rafael Ignacio Zurita <rizurita@yahoo.com> |
| 6 | * |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 7 | * Based on sh_dac_audio.c (Copyright (C) 2004, 2005 by Andriy Skulysh) |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/hrtimer.h> |
| 11 | #include <linux/interrupt.h> |
| 12 | #include <linux/io.h> |
| 13 | #include <linux/platform_device.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 14 | #include <linux/slab.h> |
Paul Gortmaker | da155d5 | 2011-07-15 12:38:28 -0400 | [diff] [blame] | 15 | #include <linux/module.h> |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 16 | #include <sound/core.h> |
| 17 | #include <sound/initval.h> |
| 18 | #include <sound/pcm.h> |
| 19 | #include <sound/sh_dac_audio.h> |
| 20 | #include <asm/clock.h> |
| 21 | #include <asm/hd64461.h> |
| 22 | #include <mach/hp6xx.h> |
| 23 | #include <cpu/dac.h> |
| 24 | |
| 25 | MODULE_AUTHOR("Rafael Ignacio Zurita <rizurita@yahoo.com>"); |
| 26 | MODULE_DESCRIPTION("SuperH DAC audio driver"); |
| 27 | MODULE_LICENSE("GPL"); |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 28 | |
| 29 | /* Module Parameters */ |
| 30 | static int index = SNDRV_DEFAULT_IDX1; |
| 31 | static char *id = SNDRV_DEFAULT_STR1; |
| 32 | module_param(index, int, 0444); |
| 33 | MODULE_PARM_DESC(index, "Index value for SuperH DAC audio."); |
| 34 | module_param(id, charp, 0444); |
| 35 | MODULE_PARM_DESC(id, "ID string for SuperH DAC audio."); |
| 36 | |
| 37 | /* main struct */ |
| 38 | struct snd_sh_dac { |
| 39 | struct snd_card *card; |
| 40 | struct snd_pcm_substream *substream; |
| 41 | struct hrtimer hrtimer; |
| 42 | ktime_t wakeups_per_second; |
| 43 | |
| 44 | int rate; |
| 45 | int empty; |
| 46 | char *data_buffer, *buffer_begin, *buffer_end; |
| 47 | int processed; /* bytes proccesed, to compare with period_size */ |
| 48 | int buffer_size; |
| 49 | struct dac_audio_pdata *pdata; |
| 50 | }; |
| 51 | |
| 52 | |
| 53 | static void dac_audio_start_timer(struct snd_sh_dac *chip) |
| 54 | { |
| 55 | hrtimer_start(&chip->hrtimer, chip->wakeups_per_second, |
| 56 | HRTIMER_MODE_REL); |
| 57 | } |
| 58 | |
| 59 | static void dac_audio_stop_timer(struct snd_sh_dac *chip) |
| 60 | { |
| 61 | hrtimer_cancel(&chip->hrtimer); |
| 62 | } |
| 63 | |
| 64 | static void dac_audio_reset(struct snd_sh_dac *chip) |
| 65 | { |
| 66 | dac_audio_stop_timer(chip); |
| 67 | chip->buffer_begin = chip->buffer_end = chip->data_buffer; |
| 68 | chip->processed = 0; |
| 69 | chip->empty = 1; |
| 70 | } |
| 71 | |
| 72 | static void dac_audio_set_rate(struct snd_sh_dac *chip) |
| 73 | { |
Thomas Gleixner | 8b0e195 | 2016-12-25 12:30:41 +0100 | [diff] [blame] | 74 | chip->wakeups_per_second = 1000000000 / chip->rate; |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | |
| 78 | /* PCM INTERFACE */ |
| 79 | |
Bhumika Goyal | cd196fe | 2017-08-17 14:45:57 +0530 | [diff] [blame] | 80 | static const struct snd_pcm_hardware snd_sh_dac_pcm_hw = { |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 81 | .info = (SNDRV_PCM_INFO_MMAP | |
| 82 | SNDRV_PCM_INFO_MMAP_VALID | |
| 83 | SNDRV_PCM_INFO_INTERLEAVED | |
| 84 | SNDRV_PCM_INFO_HALF_DUPLEX), |
| 85 | .formats = SNDRV_PCM_FMTBIT_U8, |
| 86 | .rates = SNDRV_PCM_RATE_8000, |
| 87 | .rate_min = 8000, |
| 88 | .rate_max = 8000, |
| 89 | .channels_min = 1, |
| 90 | .channels_max = 1, |
| 91 | .buffer_bytes_max = (48*1024), |
| 92 | .period_bytes_min = 1, |
| 93 | .period_bytes_max = (48*1024), |
| 94 | .periods_min = 1, |
| 95 | .periods_max = 1024, |
| 96 | }; |
| 97 | |
| 98 | static int snd_sh_dac_pcm_open(struct snd_pcm_substream *substream) |
| 99 | { |
| 100 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
| 101 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 102 | |
| 103 | runtime->hw = snd_sh_dac_pcm_hw; |
| 104 | |
| 105 | chip->substream = substream; |
| 106 | chip->buffer_begin = chip->buffer_end = chip->data_buffer; |
| 107 | chip->processed = 0; |
| 108 | chip->empty = 1; |
| 109 | |
| 110 | chip->pdata->start(chip->pdata); |
| 111 | |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static int snd_sh_dac_pcm_close(struct snd_pcm_substream *substream) |
| 116 | { |
| 117 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
| 118 | |
| 119 | chip->substream = NULL; |
| 120 | |
| 121 | dac_audio_stop_timer(chip); |
| 122 | chip->pdata->stop(chip->pdata); |
| 123 | |
| 124 | return 0; |
| 125 | } |
| 126 | |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 127 | static int snd_sh_dac_pcm_prepare(struct snd_pcm_substream *substream) |
| 128 | { |
| 129 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
| 130 | struct snd_pcm_runtime *runtime = chip->substream->runtime; |
| 131 | |
| 132 | chip->buffer_size = runtime->buffer_size; |
| 133 | memset(chip->data_buffer, 0, chip->pdata->buffer_size); |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | static int snd_sh_dac_pcm_trigger(struct snd_pcm_substream *substream, int cmd) |
| 139 | { |
| 140 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
| 141 | |
| 142 | switch (cmd) { |
| 143 | case SNDRV_PCM_TRIGGER_START: |
| 144 | dac_audio_start_timer(chip); |
| 145 | break; |
| 146 | case SNDRV_PCM_TRIGGER_STOP: |
| 147 | chip->buffer_begin = chip->buffer_end = chip->data_buffer; |
| 148 | chip->processed = 0; |
| 149 | chip->empty = 1; |
| 150 | dac_audio_stop_timer(chip); |
| 151 | break; |
| 152 | default: |
| 153 | return -EINVAL; |
| 154 | } |
| 155 | |
| 156 | return 0; |
| 157 | } |
| 158 | |
Takashi Iwai | 1cc2f8b | 2017-05-10 21:57:16 +0200 | [diff] [blame] | 159 | static int snd_sh_dac_pcm_copy(struct snd_pcm_substream *substream, |
| 160 | int channel, unsigned long pos, |
| 161 | void __user *src, unsigned long count) |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 162 | { |
| 163 | /* channel is not used (interleaved data) */ |
| 164 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 165 | |
Takashi Iwai | 1cc2f8b | 2017-05-10 21:57:16 +0200 | [diff] [blame] | 166 | if (copy_from_user_toio(chip->data_buffer + pos, src, count)) |
| 167 | return -EFAULT; |
| 168 | chip->buffer_end = chip->data_buffer + pos + count; |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 169 | |
Takashi Iwai | 1cc2f8b | 2017-05-10 21:57:16 +0200 | [diff] [blame] | 170 | if (chip->empty) { |
| 171 | chip->empty = 0; |
| 172 | dac_audio_start_timer(chip); |
| 173 | } |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 174 | |
Takashi Iwai | 1cc2f8b | 2017-05-10 21:57:16 +0200 | [diff] [blame] | 175 | return 0; |
| 176 | } |
| 177 | |
| 178 | static int snd_sh_dac_pcm_copy_kernel(struct snd_pcm_substream *substream, |
| 179 | int channel, unsigned long pos, |
| 180 | void *src, unsigned long count) |
| 181 | { |
| 182 | /* channel is not used (interleaved data) */ |
| 183 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
Takashi Iwai | 1cc2f8b | 2017-05-10 21:57:16 +0200 | [diff] [blame] | 184 | |
| 185 | memcpy_toio(chip->data_buffer + pos, src, count); |
| 186 | chip->buffer_end = chip->data_buffer + pos + count; |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 187 | |
| 188 | if (chip->empty) { |
| 189 | chip->empty = 0; |
| 190 | dac_audio_start_timer(chip); |
| 191 | } |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static int snd_sh_dac_pcm_silence(struct snd_pcm_substream *substream, |
Takashi Iwai | 1cc2f8b | 2017-05-10 21:57:16 +0200 | [diff] [blame] | 197 | int channel, unsigned long pos, |
| 198 | unsigned long count) |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 199 | { |
| 200 | /* channel is not used (interleaved data) */ |
| 201 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 202 | |
Takashi Iwai | 1cc2f8b | 2017-05-10 21:57:16 +0200 | [diff] [blame] | 203 | memset_io(chip->data_buffer + pos, 0, count); |
| 204 | chip->buffer_end = chip->data_buffer + pos + count; |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 205 | |
| 206 | if (chip->empty) { |
| 207 | chip->empty = 0; |
| 208 | dac_audio_start_timer(chip); |
| 209 | } |
| 210 | |
| 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | static |
| 215 | snd_pcm_uframes_t snd_sh_dac_pcm_pointer(struct snd_pcm_substream *substream) |
| 216 | { |
| 217 | struct snd_sh_dac *chip = snd_pcm_substream_chip(substream); |
| 218 | int pointer = chip->buffer_begin - chip->data_buffer; |
| 219 | |
| 220 | return pointer; |
| 221 | } |
| 222 | |
| 223 | /* pcm ops */ |
Arvind Yadav | 46a085a | 2017-08-18 13:15:18 +0530 | [diff] [blame] | 224 | static const struct snd_pcm_ops snd_sh_dac_pcm_ops = { |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 225 | .open = snd_sh_dac_pcm_open, |
| 226 | .close = snd_sh_dac_pcm_close, |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 227 | .prepare = snd_sh_dac_pcm_prepare, |
| 228 | .trigger = snd_sh_dac_pcm_trigger, |
| 229 | .pointer = snd_sh_dac_pcm_pointer, |
Takashi Iwai | 1cc2f8b | 2017-05-10 21:57:16 +0200 | [diff] [blame] | 230 | .copy_user = snd_sh_dac_pcm_copy, |
| 231 | .copy_kernel = snd_sh_dac_pcm_copy_kernel, |
| 232 | .fill_silence = snd_sh_dac_pcm_silence, |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 233 | .mmap = snd_pcm_lib_mmap_iomem, |
| 234 | }; |
| 235 | |
Bill Pemberton | e74033a | 2012-12-06 12:35:24 -0500 | [diff] [blame] | 236 | static int snd_sh_dac_pcm(struct snd_sh_dac *chip, int device) |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 237 | { |
| 238 | int err; |
| 239 | struct snd_pcm *pcm; |
| 240 | |
| 241 | /* device should be always 0 for us */ |
| 242 | err = snd_pcm_new(chip->card, "SH_DAC PCM", device, 1, 0, &pcm); |
| 243 | if (err < 0) |
| 244 | return err; |
| 245 | |
| 246 | pcm->private_data = chip; |
| 247 | strcpy(pcm->name, "SH_DAC PCM"); |
| 248 | snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_sh_dac_pcm_ops); |
| 249 | |
| 250 | /* buffer size=48K */ |
Takashi Iwai | 50cdf3a | 2019-12-09 10:49:33 +0100 | [diff] [blame] | 251 | snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, |
| 252 | NULL, 48 * 1024, 48 * 1024); |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 253 | |
| 254 | return 0; |
| 255 | } |
| 256 | /* END OF PCM INTERFACE */ |
| 257 | |
| 258 | |
| 259 | /* driver .remove -- destructor */ |
| 260 | static int snd_sh_dac_remove(struct platform_device *devptr) |
| 261 | { |
| 262 | snd_card_free(platform_get_drvdata(devptr)); |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 263 | return 0; |
| 264 | } |
| 265 | |
| 266 | /* free -- it has been defined by create */ |
| 267 | static int snd_sh_dac_free(struct snd_sh_dac *chip) |
| 268 | { |
| 269 | /* release the data */ |
| 270 | kfree(chip->data_buffer); |
| 271 | kfree(chip); |
| 272 | |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | static int snd_sh_dac_dev_free(struct snd_device *device) |
| 277 | { |
| 278 | struct snd_sh_dac *chip = device->device_data; |
| 279 | |
| 280 | return snd_sh_dac_free(chip); |
| 281 | } |
| 282 | |
| 283 | static enum hrtimer_restart sh_dac_audio_timer(struct hrtimer *handle) |
| 284 | { |
| 285 | struct snd_sh_dac *chip = container_of(handle, struct snd_sh_dac, |
| 286 | hrtimer); |
| 287 | struct snd_pcm_runtime *runtime = chip->substream->runtime; |
| 288 | ssize_t b_ps = frames_to_bytes(runtime, runtime->period_size); |
| 289 | |
| 290 | if (!chip->empty) { |
| 291 | sh_dac_output(*chip->buffer_begin, chip->pdata->channel); |
| 292 | chip->buffer_begin++; |
| 293 | |
| 294 | chip->processed++; |
| 295 | if (chip->processed >= b_ps) { |
| 296 | chip->processed -= b_ps; |
| 297 | snd_pcm_period_elapsed(chip->substream); |
| 298 | } |
| 299 | |
| 300 | if (chip->buffer_begin == (chip->data_buffer + |
| 301 | chip->buffer_size - 1)) |
| 302 | chip->buffer_begin = chip->data_buffer; |
| 303 | |
| 304 | if (chip->buffer_begin == chip->buffer_end) |
| 305 | chip->empty = 1; |
| 306 | |
| 307 | } |
| 308 | |
| 309 | if (!chip->empty) |
| 310 | hrtimer_start(&chip->hrtimer, chip->wakeups_per_second, |
| 311 | HRTIMER_MODE_REL); |
| 312 | |
| 313 | return HRTIMER_NORESTART; |
| 314 | } |
| 315 | |
| 316 | /* create -- chip-specific constructor for the cards components */ |
Bill Pemberton | e74033a | 2012-12-06 12:35:24 -0500 | [diff] [blame] | 317 | static int snd_sh_dac_create(struct snd_card *card, |
| 318 | struct platform_device *devptr, |
| 319 | struct snd_sh_dac **rchip) |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 320 | { |
| 321 | struct snd_sh_dac *chip; |
| 322 | int err; |
| 323 | |
Takashi Iwai | 52b136d | 2020-01-03 09:16:33 +0100 | [diff] [blame] | 324 | static const struct snd_device_ops ops = { |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 325 | .dev_free = snd_sh_dac_dev_free, |
| 326 | }; |
| 327 | |
| 328 | *rchip = NULL; |
| 329 | |
| 330 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
| 331 | if (chip == NULL) |
| 332 | return -ENOMEM; |
| 333 | |
| 334 | chip->card = card; |
| 335 | |
| 336 | hrtimer_init(&chip->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
| 337 | chip->hrtimer.function = sh_dac_audio_timer; |
| 338 | |
| 339 | dac_audio_reset(chip); |
| 340 | chip->rate = 8000; |
| 341 | dac_audio_set_rate(chip); |
| 342 | |
| 343 | chip->pdata = devptr->dev.platform_data; |
| 344 | |
| 345 | chip->data_buffer = kmalloc(chip->pdata->buffer_size, GFP_KERNEL); |
| 346 | if (chip->data_buffer == NULL) { |
| 347 | kfree(chip); |
| 348 | return -ENOMEM; |
| 349 | } |
| 350 | |
| 351 | err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops); |
| 352 | if (err < 0) { |
| 353 | snd_sh_dac_free(chip); |
| 354 | return err; |
| 355 | } |
| 356 | |
| 357 | *rchip = chip; |
| 358 | |
| 359 | return 0; |
| 360 | } |
| 361 | |
| 362 | /* driver .probe -- constructor */ |
Bill Pemberton | e74033a | 2012-12-06 12:35:24 -0500 | [diff] [blame] | 363 | static int snd_sh_dac_probe(struct platform_device *devptr) |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 364 | { |
| 365 | struct snd_sh_dac *chip; |
| 366 | struct snd_card *card; |
| 367 | int err; |
| 368 | |
Takashi Iwai | e7182ac | 2014-01-29 14:40:03 +0100 | [diff] [blame] | 369 | err = snd_card_new(&devptr->dev, index, id, THIS_MODULE, 0, &card); |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 370 | if (err < 0) { |
| 371 | snd_printk(KERN_ERR "cannot allocate the card\n"); |
| 372 | return err; |
| 373 | } |
| 374 | |
| 375 | err = snd_sh_dac_create(card, devptr, &chip); |
| 376 | if (err < 0) |
| 377 | goto probe_error; |
| 378 | |
| 379 | err = snd_sh_dac_pcm(chip, 0); |
| 380 | if (err < 0) |
| 381 | goto probe_error; |
| 382 | |
| 383 | strcpy(card->driver, "snd_sh_dac"); |
| 384 | strcpy(card->shortname, "SuperH DAC audio driver"); |
| 385 | printk(KERN_INFO "%s %s", card->longname, card->shortname); |
| 386 | |
| 387 | err = snd_card_register(card); |
| 388 | if (err < 0) |
| 389 | goto probe_error; |
| 390 | |
Takashi Iwai | c054c8a | 2017-08-31 10:57:36 +0200 | [diff] [blame] | 391 | snd_printk(KERN_INFO "ALSA driver for SuperH DAC audio"); |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 392 | |
| 393 | platform_set_drvdata(devptr, card); |
| 394 | return 0; |
| 395 | |
| 396 | probe_error: |
| 397 | snd_card_free(card); |
| 398 | return err; |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * "driver" definition |
| 403 | */ |
Paul Mundt | d4c6983 | 2012-05-21 18:21:54 +0900 | [diff] [blame] | 404 | static struct platform_driver sh_dac_driver = { |
Rafael Ignacio Zurita | 9dcaa7b | 2009-11-03 17:16:27 -0300 | [diff] [blame] | 405 | .probe = snd_sh_dac_probe, |
| 406 | .remove = snd_sh_dac_remove, |
| 407 | .driver = { |
| 408 | .name = "dac_audio", |
| 409 | }, |
| 410 | }; |
| 411 | |
Paul Mundt | d4c6983 | 2012-05-21 18:21:54 +0900 | [diff] [blame] | 412 | module_platform_driver(sh_dac_driver); |