1 /* 2 * kirkwood-dma.c 3 * 4 * (c) 2010 Arnaud Patard <apatard@mandriva.com> 5 * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the 9 * Free Software Foundation; either version 2 of the License, or (at your 10 * option) any later version. 11 */ 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/device.h> 16 #include <linux/io.h> 17 #include <linux/slab.h> 18 #include <linux/interrupt.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/mbus.h> 21 #include <sound/soc.h> 22 #include "kirkwood.h" 23 24 #define KIRKWOOD_RATES \ 25 (SNDRV_PCM_RATE_8000_192000 | \ 26 SNDRV_PCM_RATE_CONTINUOUS | \ 27 SNDRV_PCM_RATE_KNOT) 28 29 #define KIRKWOOD_FORMATS \ 30 (SNDRV_PCM_FMTBIT_S16_LE | \ 31 SNDRV_PCM_FMTBIT_S24_LE | \ 32 SNDRV_PCM_FMTBIT_S32_LE | \ 33 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE | \ 34 SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE) 35 36 struct kirkwood_dma_priv { 37 struct snd_pcm_substream *play_stream; 38 struct snd_pcm_substream *rec_stream; 39 struct kirkwood_dma_data *data; 40 }; 41 42 static struct snd_pcm_hardware kirkwood_dma_snd_hw = { 43 .info = (SNDRV_PCM_INFO_INTERLEAVED | 44 SNDRV_PCM_INFO_MMAP | 45 SNDRV_PCM_INFO_MMAP_VALID | 46 SNDRV_PCM_INFO_BLOCK_TRANSFER | 47 SNDRV_PCM_INFO_PAUSE), 48 .formats = KIRKWOOD_FORMATS, 49 .rates = KIRKWOOD_RATES, 50 .rate_min = 8000, 51 .rate_max = 384000, 52 .channels_min = 1, 53 .channels_max = 8, 54 .buffer_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES * KIRKWOOD_SND_MAX_PERIODS, 55 .period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES, 56 .period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES, 57 .periods_min = KIRKWOOD_SND_MIN_PERIODS, 58 .periods_max = KIRKWOOD_SND_MAX_PERIODS, 59 .fifo_size = 0, 60 }; 61 62 static u64 kirkwood_dma_dmamask = DMA_BIT_MASK(32); 63 64 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id) 65 { 66 struct kirkwood_dma_priv *prdata = dev_id; 67 struct kirkwood_dma_data *priv = prdata->data; 68 unsigned long mask, status, cause; 69 70 mask = readl(priv->io + KIRKWOOD_INT_MASK); 71 status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask; 72 73 cause = readl(priv->io + KIRKWOOD_ERR_CAUSE); 74 if (unlikely(cause)) { 75 printk(KERN_WARNING "%s: got err interrupt 0x%lx\n", 76 __func__, cause); 77 writel(cause, priv->io + KIRKWOOD_ERR_CAUSE); 78 } 79 80 /* we've enabled only bytes interrupts ... */ 81 if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \ 82 KIRKWOOD_INT_CAUSE_REC_BYTES)) { 83 printk(KERN_WARNING "%s: unexpected interrupt %lx\n", 84 __func__, status); 85 return IRQ_NONE; 86 } 87 88 /* ack int */ 89 writel(status, priv->io + KIRKWOOD_INT_CAUSE); 90 91 if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES) 92 snd_pcm_period_elapsed(prdata->play_stream); 93 94 if (status & KIRKWOOD_INT_CAUSE_REC_BYTES) 95 snd_pcm_period_elapsed(prdata->rec_stream); 96 97 return IRQ_HANDLED; 98 } 99 100 static void 101 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win, 102 unsigned long dma, 103 const struct mbus_dram_target_info *dram) 104 { 105 int i; 106 107 /* First disable and clear windows */ 108 writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); 109 writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); 110 111 /* try to find matching cs for current dma address */ 112 for (i = 0; i < dram->num_cs; i++) { 113 const struct mbus_dram_window *cs = dram->cs + i; 114 if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) { 115 writel(cs->base & 0xffff0000, 116 base + KIRKWOOD_AUDIO_WIN_BASE_REG(win)); 117 writel(((cs->size - 1) & 0xffff0000) | 118 (cs->mbus_attr << 8) | 119 (dram->mbus_dram_target_id << 4) | 1, 120 base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win)); 121 } 122 } 123 } 124 125 static int kirkwood_dma_open(struct snd_pcm_substream *substream) 126 { 127 int err; 128 struct snd_pcm_runtime *runtime = substream->runtime; 129 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; 130 struct snd_soc_platform *platform = soc_runtime->platform; 131 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; 132 struct kirkwood_dma_data *priv; 133 struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform); 134 const struct mbus_dram_target_info *dram; 135 unsigned long addr; 136 137 priv = snd_soc_dai_get_dma_data(cpu_dai, substream); 138 snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw); 139 140 /* Ensure that all constraints linked to dma burst are fulfilled */ 141 err = snd_pcm_hw_constraint_minmax(runtime, 142 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 143 priv->burst * 2, 144 KIRKWOOD_AUDIO_BUF_MAX-1); 145 if (err < 0) 146 return err; 147 148 err = snd_pcm_hw_constraint_step(runtime, 0, 149 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 150 priv->burst); 151 if (err < 0) 152 return err; 153 154 err = snd_pcm_hw_constraint_step(substream->runtime, 0, 155 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 156 priv->burst); 157 if (err < 0) 158 return err; 159 160 if (prdata == NULL) { 161 prdata = kzalloc(sizeof(struct kirkwood_dma_priv), GFP_KERNEL); 162 if (prdata == NULL) 163 return -ENOMEM; 164 165 prdata->data = priv; 166 167 err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED, 168 "kirkwood-i2s", prdata); 169 if (err) { 170 kfree(prdata); 171 return -EBUSY; 172 } 173 174 snd_soc_platform_set_drvdata(platform, prdata); 175 176 /* 177 * Enable Error interrupts. We're only ack'ing them but 178 * it's useful for diagnostics 179 */ 180 writel((unsigned long)-1, priv->io + KIRKWOOD_ERR_MASK); 181 } 182 183 dram = mv_mbus_dram_info(); 184 addr = substream->dma_buffer.addr; 185 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 186 prdata->play_stream = substream; 187 kirkwood_dma_conf_mbus_windows(priv->io, 188 KIRKWOOD_PLAYBACK_WIN, addr, dram); 189 } else { 190 prdata->rec_stream = substream; 191 kirkwood_dma_conf_mbus_windows(priv->io, 192 KIRKWOOD_RECORD_WIN, addr, dram); 193 } 194 195 return 0; 196 } 197 198 static int kirkwood_dma_close(struct snd_pcm_substream *substream) 199 { 200 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; 201 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; 202 struct snd_soc_platform *platform = soc_runtime->platform; 203 struct kirkwood_dma_priv *prdata = snd_soc_platform_get_drvdata(platform); 204 struct kirkwood_dma_data *priv; 205 206 priv = snd_soc_dai_get_dma_data(cpu_dai, substream); 207 208 if (!prdata || !priv) 209 return 0; 210 211 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 212 prdata->play_stream = NULL; 213 else 214 prdata->rec_stream = NULL; 215 216 if (!prdata->play_stream && !prdata->rec_stream) { 217 writel(0, priv->io + KIRKWOOD_ERR_MASK); 218 free_irq(priv->irq, prdata); 219 kfree(prdata); 220 snd_soc_platform_set_drvdata(platform, NULL); 221 } 222 223 return 0; 224 } 225 226 static int kirkwood_dma_hw_params(struct snd_pcm_substream *substream, 227 struct snd_pcm_hw_params *params) 228 { 229 struct snd_pcm_runtime *runtime = substream->runtime; 230 231 snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); 232 runtime->dma_bytes = params_buffer_bytes(params); 233 234 return 0; 235 } 236 237 static int kirkwood_dma_hw_free(struct snd_pcm_substream *substream) 238 { 239 snd_pcm_set_runtime_buffer(substream, NULL); 240 return 0; 241 } 242 243 static int kirkwood_dma_prepare(struct snd_pcm_substream *substream) 244 { 245 struct snd_pcm_runtime *runtime = substream->runtime; 246 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; 247 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; 248 struct kirkwood_dma_data *priv; 249 unsigned long size, count; 250 251 priv = snd_soc_dai_get_dma_data(cpu_dai, substream); 252 253 /* compute buffer size in term of "words" as requested in specs */ 254 size = frames_to_bytes(runtime, runtime->buffer_size); 255 size = (size>>2)-1; 256 count = snd_pcm_lib_period_bytes(substream); 257 258 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 259 writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT); 260 writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR); 261 writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE); 262 } else { 263 writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT); 264 writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR); 265 writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE); 266 } 267 268 269 return 0; 270 } 271 272 static snd_pcm_uframes_t kirkwood_dma_pointer(struct snd_pcm_substream 273 *substream) 274 { 275 struct snd_soc_pcm_runtime *soc_runtime = substream->private_data; 276 struct snd_soc_dai *cpu_dai = soc_runtime->cpu_dai; 277 struct kirkwood_dma_data *priv; 278 snd_pcm_uframes_t count; 279 280 priv = snd_soc_dai_get_dma_data(cpu_dai, substream); 281 282 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 283 count = bytes_to_frames(substream->runtime, 284 readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT)); 285 else 286 count = bytes_to_frames(substream->runtime, 287 readl(priv->io + KIRKWOOD_REC_BYTE_COUNT)); 288 289 return count; 290 } 291 292 struct snd_pcm_ops kirkwood_dma_ops = { 293 .open = kirkwood_dma_open, 294 .close = kirkwood_dma_close, 295 .ioctl = snd_pcm_lib_ioctl, 296 .hw_params = kirkwood_dma_hw_params, 297 .hw_free = kirkwood_dma_hw_free, 298 .prepare = kirkwood_dma_prepare, 299 .pointer = kirkwood_dma_pointer, 300 }; 301 302 static int kirkwood_dma_preallocate_dma_buffer(struct snd_pcm *pcm, 303 int stream) 304 { 305 struct snd_pcm_substream *substream = pcm->streams[stream].substream; 306 struct snd_dma_buffer *buf = &substream->dma_buffer; 307 size_t size = kirkwood_dma_snd_hw.buffer_bytes_max; 308 309 buf->dev.type = SNDRV_DMA_TYPE_DEV; 310 buf->dev.dev = pcm->card->dev; 311 buf->area = dma_alloc_coherent(pcm->card->dev, size, 312 &buf->addr, GFP_KERNEL); 313 if (!buf->area) 314 return -ENOMEM; 315 buf->bytes = size; 316 buf->private_data = NULL; 317 318 return 0; 319 } 320 321 static int kirkwood_dma_new(struct snd_soc_pcm_runtime *rtd) 322 { 323 struct snd_card *card = rtd->card->snd_card; 324 struct snd_pcm *pcm = rtd->pcm; 325 int ret; 326 327 if (!card->dev->dma_mask) 328 card->dev->dma_mask = &kirkwood_dma_dmamask; 329 if (!card->dev->coherent_dma_mask) 330 card->dev->coherent_dma_mask = DMA_BIT_MASK(32); 331 332 if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) { 333 ret = kirkwood_dma_preallocate_dma_buffer(pcm, 334 SNDRV_PCM_STREAM_PLAYBACK); 335 if (ret) 336 return ret; 337 } 338 339 if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream) { 340 ret = kirkwood_dma_preallocate_dma_buffer(pcm, 341 SNDRV_PCM_STREAM_CAPTURE); 342 if (ret) 343 return ret; 344 } 345 346 return 0; 347 } 348 349 static void kirkwood_dma_free_dma_buffers(struct snd_pcm *pcm) 350 { 351 struct snd_pcm_substream *substream; 352 struct snd_dma_buffer *buf; 353 int stream; 354 355 for (stream = 0; stream < 2; stream++) { 356 substream = pcm->streams[stream].substream; 357 if (!substream) 358 continue; 359 buf = &substream->dma_buffer; 360 if (!buf->area) 361 continue; 362 363 dma_free_coherent(pcm->card->dev, buf->bytes, 364 buf->area, buf->addr); 365 buf->area = NULL; 366 } 367 } 368 369 static struct snd_soc_platform_driver kirkwood_soc_platform = { 370 .ops = &kirkwood_dma_ops, 371 .pcm_new = kirkwood_dma_new, 372 .pcm_free = kirkwood_dma_free_dma_buffers, 373 }; 374 375 static int kirkwood_soc_platform_probe(struct platform_device *pdev) 376 { 377 return snd_soc_register_platform(&pdev->dev, &kirkwood_soc_platform); 378 } 379 380 static int kirkwood_soc_platform_remove(struct platform_device *pdev) 381 { 382 snd_soc_unregister_platform(&pdev->dev); 383 return 0; 384 } 385 386 static struct platform_driver kirkwood_pcm_driver = { 387 .driver = { 388 .name = "kirkwood-pcm-audio", 389 .owner = THIS_MODULE, 390 }, 391 392 .probe = kirkwood_soc_platform_probe, 393 .remove = kirkwood_soc_platform_remove, 394 }; 395 396 module_platform_driver(kirkwood_pcm_driver); 397 398 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>"); 399 MODULE_DESCRIPTION("Marvell Kirkwood Audio DMA module"); 400 MODULE_LICENSE("GPL"); 401 MODULE_ALIAS("platform:kirkwood-pcm-audio"); 402