Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Freescale SSI ALSA SoC Digital Audio Interface (DAI) driver |
| 3 | * |
| 4 | * Author: Timur Tabi <timur@freescale.com> |
| 5 | * |
| 6 | * Copyright 2007-2008 Freescale Semiconductor, Inc. This file is licensed |
| 7 | * under the terms of the GNU General Public License version 2. This |
| 8 | * program is licensed "as is" without any warranty of any kind, whether |
| 9 | * express or implied. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/interrupt.h> |
| 15 | #include <linux/device.h> |
| 16 | #include <linux/delay.h> |
| 17 | |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 18 | #include <sound/core.h> |
| 19 | #include <sound/pcm.h> |
| 20 | #include <sound/pcm_params.h> |
| 21 | #include <sound/initval.h> |
| 22 | #include <sound/soc.h> |
| 23 | |
| 24 | #include <asm/immap_86xx.h> |
| 25 | |
| 26 | #include "fsl_ssi.h" |
| 27 | |
| 28 | /** |
| 29 | * FSLSSI_I2S_RATES: sample rates supported by the I2S |
| 30 | * |
| 31 | * This driver currently only supports the SSI running in I2S slave mode, |
| 32 | * which means the codec determines the sample rate. Therefore, we tell |
| 33 | * ALSA that we support all rates and let the codec driver decide what rates |
| 34 | * are really supported. |
| 35 | */ |
| 36 | #define FSLSSI_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \ |
| 37 | SNDRV_PCM_RATE_CONTINUOUS) |
| 38 | |
| 39 | /** |
| 40 | * FSLSSI_I2S_FORMATS: audio formats supported by the SSI |
| 41 | * |
| 42 | * This driver currently only supports the SSI running in I2S slave mode. |
| 43 | * |
| 44 | * The SSI has a limitation in that the samples must be in the same byte |
| 45 | * order as the host CPU. This is because when multiple bytes are written |
| 46 | * to the STX register, the bytes and bits must be written in the same |
| 47 | * order. The STX is a shift register, so all the bits need to be aligned |
| 48 | * (bit-endianness must match byte-endianness). Processors typically write |
| 49 | * the bits within a byte in the same order that the bytes of a word are |
| 50 | * written in. So if the host CPU is big-endian, then only big-endian |
| 51 | * samples will be written to STX properly. |
| 52 | */ |
| 53 | #ifdef __BIG_ENDIAN |
| 54 | #define FSLSSI_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \ |
| 55 | SNDRV_PCM_FMTBIT_S18_3BE | SNDRV_PCM_FMTBIT_S20_3BE | \ |
| 56 | SNDRV_PCM_FMTBIT_S24_3BE | SNDRV_PCM_FMTBIT_S24_BE) |
| 57 | #else |
| 58 | #define FSLSSI_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | \ |
| 59 | SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S20_3LE | \ |
| 60 | SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE) |
| 61 | #endif |
| 62 | |
| 63 | /** |
| 64 | * fsl_ssi_private: per-SSI private data |
| 65 | * |
| 66 | * @name: short name for this device ("SSI0", "SSI1", etc) |
| 67 | * @ssi: pointer to the SSI's registers |
| 68 | * @ssi_phys: physical address of the SSI registers |
| 69 | * @irq: IRQ of this SSI |
Timur Tabi | be41e94 | 2008-07-28 17:04:39 -0500 | [diff] [blame] | 70 | * @first_stream: pointer to the stream that was opened first |
| 71 | * @second_stream: pointer to second stream |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 72 | * @dev: struct device pointer |
| 73 | * @playback: the number of playback streams opened |
| 74 | * @capture: the number of capture streams opened |
| 75 | * @cpu_dai: the CPU DAI for this device |
| 76 | * @dev_attr: the sysfs device attribute structure |
| 77 | * @stats: SSI statistics |
| 78 | */ |
| 79 | struct fsl_ssi_private { |
| 80 | char name[8]; |
| 81 | struct ccsr_ssi __iomem *ssi; |
| 82 | dma_addr_t ssi_phys; |
| 83 | unsigned int irq; |
Timur Tabi | be41e94 | 2008-07-28 17:04:39 -0500 | [diff] [blame] | 84 | struct snd_pcm_substream *first_stream; |
| 85 | struct snd_pcm_substream *second_stream; |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 86 | struct device *dev; |
| 87 | unsigned int playback; |
| 88 | unsigned int capture; |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 89 | struct snd_soc_dai cpu_dai; |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 90 | struct device_attribute dev_attr; |
| 91 | |
| 92 | struct { |
| 93 | unsigned int rfrc; |
| 94 | unsigned int tfrc; |
| 95 | unsigned int cmdau; |
| 96 | unsigned int cmddu; |
| 97 | unsigned int rxt; |
| 98 | unsigned int rdr1; |
| 99 | unsigned int rdr0; |
| 100 | unsigned int tde1; |
| 101 | unsigned int tde0; |
| 102 | unsigned int roe1; |
| 103 | unsigned int roe0; |
| 104 | unsigned int tue1; |
| 105 | unsigned int tue0; |
| 106 | unsigned int tfs; |
| 107 | unsigned int rfs; |
| 108 | unsigned int tls; |
| 109 | unsigned int rls; |
| 110 | unsigned int rff1; |
| 111 | unsigned int rff0; |
| 112 | unsigned int tfe1; |
| 113 | unsigned int tfe0; |
| 114 | } stats; |
| 115 | }; |
| 116 | |
| 117 | /** |
| 118 | * fsl_ssi_isr: SSI interrupt handler |
| 119 | * |
| 120 | * Although it's possible to use the interrupt handler to send and receive |
| 121 | * data to/from the SSI, we use the DMA instead. Programming is more |
| 122 | * complicated, but the performance is much better. |
| 123 | * |
| 124 | * This interrupt handler is used only to gather statistics. |
| 125 | * |
| 126 | * @irq: IRQ of the SSI device |
| 127 | * @dev_id: pointer to the ssi_private structure for this SSI device |
| 128 | */ |
| 129 | static irqreturn_t fsl_ssi_isr(int irq, void *dev_id) |
| 130 | { |
| 131 | struct fsl_ssi_private *ssi_private = dev_id; |
| 132 | struct ccsr_ssi __iomem *ssi = ssi_private->ssi; |
| 133 | irqreturn_t ret = IRQ_NONE; |
| 134 | __be32 sisr; |
| 135 | __be32 sisr2 = 0; |
| 136 | |
| 137 | /* We got an interrupt, so read the status register to see what we |
| 138 | were interrupted for. We mask it with the Interrupt Enable register |
| 139 | so that we only check for events that we're interested in. |
| 140 | */ |
| 141 | sisr = in_be32(&ssi->sisr) & in_be32(&ssi->sier); |
| 142 | |
| 143 | if (sisr & CCSR_SSI_SISR_RFRC) { |
| 144 | ssi_private->stats.rfrc++; |
| 145 | sisr2 |= CCSR_SSI_SISR_RFRC; |
| 146 | ret = IRQ_HANDLED; |
| 147 | } |
| 148 | |
| 149 | if (sisr & CCSR_SSI_SISR_TFRC) { |
| 150 | ssi_private->stats.tfrc++; |
| 151 | sisr2 |= CCSR_SSI_SISR_TFRC; |
| 152 | ret = IRQ_HANDLED; |
| 153 | } |
| 154 | |
| 155 | if (sisr & CCSR_SSI_SISR_CMDAU) { |
| 156 | ssi_private->stats.cmdau++; |
| 157 | ret = IRQ_HANDLED; |
| 158 | } |
| 159 | |
| 160 | if (sisr & CCSR_SSI_SISR_CMDDU) { |
| 161 | ssi_private->stats.cmddu++; |
| 162 | ret = IRQ_HANDLED; |
| 163 | } |
| 164 | |
| 165 | if (sisr & CCSR_SSI_SISR_RXT) { |
| 166 | ssi_private->stats.rxt++; |
| 167 | ret = IRQ_HANDLED; |
| 168 | } |
| 169 | |
| 170 | if (sisr & CCSR_SSI_SISR_RDR1) { |
| 171 | ssi_private->stats.rdr1++; |
| 172 | ret = IRQ_HANDLED; |
| 173 | } |
| 174 | |
| 175 | if (sisr & CCSR_SSI_SISR_RDR0) { |
| 176 | ssi_private->stats.rdr0++; |
| 177 | ret = IRQ_HANDLED; |
| 178 | } |
| 179 | |
| 180 | if (sisr & CCSR_SSI_SISR_TDE1) { |
| 181 | ssi_private->stats.tde1++; |
| 182 | ret = IRQ_HANDLED; |
| 183 | } |
| 184 | |
| 185 | if (sisr & CCSR_SSI_SISR_TDE0) { |
| 186 | ssi_private->stats.tde0++; |
| 187 | ret = IRQ_HANDLED; |
| 188 | } |
| 189 | |
| 190 | if (sisr & CCSR_SSI_SISR_ROE1) { |
| 191 | ssi_private->stats.roe1++; |
| 192 | sisr2 |= CCSR_SSI_SISR_ROE1; |
| 193 | ret = IRQ_HANDLED; |
| 194 | } |
| 195 | |
| 196 | if (sisr & CCSR_SSI_SISR_ROE0) { |
| 197 | ssi_private->stats.roe0++; |
| 198 | sisr2 |= CCSR_SSI_SISR_ROE0; |
| 199 | ret = IRQ_HANDLED; |
| 200 | } |
| 201 | |
| 202 | if (sisr & CCSR_SSI_SISR_TUE1) { |
| 203 | ssi_private->stats.tue1++; |
| 204 | sisr2 |= CCSR_SSI_SISR_TUE1; |
| 205 | ret = IRQ_HANDLED; |
| 206 | } |
| 207 | |
| 208 | if (sisr & CCSR_SSI_SISR_TUE0) { |
| 209 | ssi_private->stats.tue0++; |
| 210 | sisr2 |= CCSR_SSI_SISR_TUE0; |
| 211 | ret = IRQ_HANDLED; |
| 212 | } |
| 213 | |
| 214 | if (sisr & CCSR_SSI_SISR_TFS) { |
| 215 | ssi_private->stats.tfs++; |
| 216 | ret = IRQ_HANDLED; |
| 217 | } |
| 218 | |
| 219 | if (sisr & CCSR_SSI_SISR_RFS) { |
| 220 | ssi_private->stats.rfs++; |
| 221 | ret = IRQ_HANDLED; |
| 222 | } |
| 223 | |
| 224 | if (sisr & CCSR_SSI_SISR_TLS) { |
| 225 | ssi_private->stats.tls++; |
| 226 | ret = IRQ_HANDLED; |
| 227 | } |
| 228 | |
| 229 | if (sisr & CCSR_SSI_SISR_RLS) { |
| 230 | ssi_private->stats.rls++; |
| 231 | ret = IRQ_HANDLED; |
| 232 | } |
| 233 | |
| 234 | if (sisr & CCSR_SSI_SISR_RFF1) { |
| 235 | ssi_private->stats.rff1++; |
| 236 | ret = IRQ_HANDLED; |
| 237 | } |
| 238 | |
| 239 | if (sisr & CCSR_SSI_SISR_RFF0) { |
| 240 | ssi_private->stats.rff0++; |
| 241 | ret = IRQ_HANDLED; |
| 242 | } |
| 243 | |
| 244 | if (sisr & CCSR_SSI_SISR_TFE1) { |
| 245 | ssi_private->stats.tfe1++; |
| 246 | ret = IRQ_HANDLED; |
| 247 | } |
| 248 | |
| 249 | if (sisr & CCSR_SSI_SISR_TFE0) { |
| 250 | ssi_private->stats.tfe0++; |
| 251 | ret = IRQ_HANDLED; |
| 252 | } |
| 253 | |
| 254 | /* Clear the bits that we set */ |
| 255 | if (sisr2) |
| 256 | out_be32(&ssi->sisr, sisr2); |
| 257 | |
| 258 | return ret; |
| 259 | } |
| 260 | |
| 261 | /** |
| 262 | * fsl_ssi_startup: create a new substream |
| 263 | * |
| 264 | * This is the first function called when a stream is opened. |
| 265 | * |
| 266 | * If this is the first stream open, then grab the IRQ and program most of |
| 267 | * the SSI registers. |
| 268 | */ |
Mark Brown | dee89c4 | 2008-11-18 22:11:38 +0000 | [diff] [blame] | 269 | static int fsl_ssi_startup(struct snd_pcm_substream *substream, |
| 270 | struct snd_soc_dai *dai) |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 271 | { |
| 272 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 273 | struct fsl_ssi_private *ssi_private = rtd->dai->cpu_dai->private_data; |
| 274 | |
| 275 | /* |
| 276 | * If this is the first stream opened, then request the IRQ |
| 277 | * and initialize the SSI registers. |
| 278 | */ |
| 279 | if (!ssi_private->playback && !ssi_private->capture) { |
| 280 | struct ccsr_ssi __iomem *ssi = ssi_private->ssi; |
| 281 | int ret; |
| 282 | |
| 283 | ret = request_irq(ssi_private->irq, fsl_ssi_isr, 0, |
| 284 | ssi_private->name, ssi_private); |
| 285 | if (ret < 0) { |
| 286 | dev_err(substream->pcm->card->dev, |
| 287 | "could not claim irq %u\n", ssi_private->irq); |
| 288 | return ret; |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Section 16.5 of the MPC8610 reference manual says that the |
| 293 | * SSI needs to be disabled before updating the registers we set |
| 294 | * here. |
| 295 | */ |
| 296 | clrbits32(&ssi->scr, CCSR_SSI_SCR_SSIEN); |
| 297 | |
| 298 | /* |
| 299 | * Program the SSI into I2S Slave Non-Network Synchronous mode. |
| 300 | * Also enable the transmit and receive FIFO. |
| 301 | * |
| 302 | * FIXME: Little-endian samples require a different shift dir |
| 303 | */ |
| 304 | clrsetbits_be32(&ssi->scr, CCSR_SSI_SCR_I2S_MODE_MASK, |
| 305 | CCSR_SSI_SCR_TFR_CLK_DIS | |
| 306 | CCSR_SSI_SCR_I2S_MODE_SLAVE | CCSR_SSI_SCR_SYN); |
| 307 | |
| 308 | out_be32(&ssi->stcr, |
| 309 | CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TFEN0 | |
| 310 | CCSR_SSI_STCR_TFSI | CCSR_SSI_STCR_TEFS | |
| 311 | CCSR_SSI_STCR_TSCKP); |
| 312 | |
| 313 | out_be32(&ssi->srcr, |
| 314 | CCSR_SSI_SRCR_RXBIT0 | CCSR_SSI_SRCR_RFEN0 | |
| 315 | CCSR_SSI_SRCR_RFSI | CCSR_SSI_SRCR_REFS | |
| 316 | CCSR_SSI_SRCR_RSCKP); |
| 317 | |
| 318 | /* |
| 319 | * The DC and PM bits are only used if the SSI is the clock |
| 320 | * master. |
| 321 | */ |
| 322 | |
| 323 | /* 4. Enable the interrupts and DMA requests */ |
| 324 | out_be32(&ssi->sier, |
| 325 | CCSR_SSI_SIER_TFRC_EN | CCSR_SSI_SIER_TDMAE | |
| 326 | CCSR_SSI_SIER_TIE | CCSR_SSI_SIER_TUE0_EN | |
| 327 | CCSR_SSI_SIER_TUE1_EN | CCSR_SSI_SIER_RFRC_EN | |
| 328 | CCSR_SSI_SIER_RDMAE | CCSR_SSI_SIER_RIE | |
| 329 | CCSR_SSI_SIER_ROE0_EN | CCSR_SSI_SIER_ROE1_EN); |
| 330 | |
| 331 | /* |
| 332 | * Set the watermark for transmit FIFI 0 and receive FIFO 0. We |
| 333 | * don't use FIFO 1. Since the SSI only supports stereo, the |
| 334 | * watermark should never be an odd number. |
| 335 | */ |
| 336 | out_be32(&ssi->sfcsr, |
| 337 | CCSR_SSI_SFCSR_TFWM0(6) | CCSR_SSI_SFCSR_RFWM0(2)); |
| 338 | |
| 339 | /* |
| 340 | * We keep the SSI disabled because if we enable it, then the |
| 341 | * DMA controller will start. It's not supposed to start until |
| 342 | * the SCR.TE (or SCR.RE) bit is set, but it does anyway. The |
| 343 | * DMA controller will transfer one "BWC" of data (i.e. the |
| 344 | * amount of data that the MR.BWC bits are set to). The reason |
| 345 | * this is bad is because at this point, the PCM driver has not |
| 346 | * finished initializing the DMA controller. |
| 347 | */ |
| 348 | } |
| 349 | |
Timur Tabi | be41e94 | 2008-07-28 17:04:39 -0500 | [diff] [blame] | 350 | if (!ssi_private->first_stream) |
| 351 | ssi_private->first_stream = substream; |
| 352 | else { |
| 353 | /* This is the second stream open, so we need to impose sample |
| 354 | * rate and maybe sample size constraints. Note that this can |
| 355 | * cause a race condition if the second stream is opened before |
| 356 | * the first stream is fully initialized. |
| 357 | * |
| 358 | * We provide some protection by checking to make sure the first |
| 359 | * stream is initialized, but it's not perfect. ALSA sometimes |
| 360 | * re-initializes the driver with a different sample rate or |
| 361 | * size. If the second stream is opened before the first stream |
| 362 | * has received its final parameters, then the second stream may |
| 363 | * be constrained to the wrong sample rate or size. |
| 364 | * |
| 365 | * FIXME: This code does not handle opening and closing streams |
| 366 | * repeatedly. If you open two streams and then close the first |
| 367 | * one, you may not be able to open another stream until you |
| 368 | * close the second one as well. |
| 369 | */ |
| 370 | struct snd_pcm_runtime *first_runtime = |
| 371 | ssi_private->first_stream->runtime; |
| 372 | |
| 373 | if (!first_runtime->rate || !first_runtime->sample_bits) { |
| 374 | dev_err(substream->pcm->card->dev, |
| 375 | "set sample rate and size in %s stream first\n", |
| 376 | substream->stream == SNDRV_PCM_STREAM_PLAYBACK |
| 377 | ? "capture" : "playback"); |
| 378 | return -EAGAIN; |
| 379 | } |
| 380 | |
| 381 | snd_pcm_hw_constraint_minmax(substream->runtime, |
| 382 | SNDRV_PCM_HW_PARAM_RATE, |
| 383 | first_runtime->rate, first_runtime->rate); |
| 384 | |
| 385 | snd_pcm_hw_constraint_minmax(substream->runtime, |
| 386 | SNDRV_PCM_HW_PARAM_SAMPLE_BITS, |
| 387 | first_runtime->sample_bits, |
| 388 | first_runtime->sample_bits); |
| 389 | |
| 390 | ssi_private->second_stream = substream; |
| 391 | } |
| 392 | |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 393 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| 394 | ssi_private->playback++; |
| 395 | |
| 396 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) |
| 397 | ssi_private->capture++; |
| 398 | |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | /** |
| 403 | * fsl_ssi_prepare: prepare the SSI. |
| 404 | * |
| 405 | * Most of the SSI registers have been programmed in the startup function, |
| 406 | * but the word length must be programmed here. Unfortunately, programming |
| 407 | * the SxCCR.WL bits requires the SSI to be temporarily disabled. This can |
| 408 | * cause a problem with supporting simultaneous playback and capture. If |
| 409 | * the SSI is already playing a stream, then that stream may be temporarily |
| 410 | * stopped when you start capture. |
| 411 | * |
| 412 | * Note: The SxCCR.DC and SxCCR.PM bits are only used if the SSI is the |
| 413 | * clock master. |
| 414 | */ |
Mark Brown | dee89c4 | 2008-11-18 22:11:38 +0000 | [diff] [blame] | 415 | static int fsl_ssi_prepare(struct snd_pcm_substream *substream, |
| 416 | struct snd_soc_dai *dai) |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 417 | { |
| 418 | struct snd_pcm_runtime *runtime = substream->runtime; |
| 419 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 420 | struct fsl_ssi_private *ssi_private = rtd->dai->cpu_dai->private_data; |
| 421 | |
| 422 | struct ccsr_ssi __iomem *ssi = ssi_private->ssi; |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 423 | |
Timur Tabi | be41e94 | 2008-07-28 17:04:39 -0500 | [diff] [blame] | 424 | if (substream == ssi_private->first_stream) { |
| 425 | u32 wl; |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 426 | |
Timur Tabi | be41e94 | 2008-07-28 17:04:39 -0500 | [diff] [blame] | 427 | /* The SSI should always be disabled at this points (SSIEN=0) */ |
| 428 | wl = CCSR_SSI_SxCCR_WL(snd_pcm_format_width(runtime->format)); |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 429 | |
Timur Tabi | be41e94 | 2008-07-28 17:04:39 -0500 | [diff] [blame] | 430 | /* In synchronous mode, the SSI uses STCCR for capture */ |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 431 | clrsetbits_be32(&ssi->stccr, CCSR_SSI_SxCCR_WL_MASK, wl); |
Timur Tabi | be41e94 | 2008-07-28 17:04:39 -0500 | [diff] [blame] | 432 | } |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 433 | |
| 434 | return 0; |
| 435 | } |
| 436 | |
| 437 | /** |
| 438 | * fsl_ssi_trigger: start and stop the DMA transfer. |
| 439 | * |
| 440 | * This function is called by ALSA to start, stop, pause, and resume the DMA |
| 441 | * transfer of data. |
| 442 | * |
| 443 | * The DMA channel is in external master start and pause mode, which |
| 444 | * means the SSI completely controls the flow of data. |
| 445 | */ |
Mark Brown | dee89c4 | 2008-11-18 22:11:38 +0000 | [diff] [blame] | 446 | static int fsl_ssi_trigger(struct snd_pcm_substream *substream, int cmd, |
| 447 | struct snd_soc_dai *dai) |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 448 | { |
| 449 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 450 | struct fsl_ssi_private *ssi_private = rtd->dai->cpu_dai->private_data; |
| 451 | struct ccsr_ssi __iomem *ssi = ssi_private->ssi; |
| 452 | |
| 453 | switch (cmd) { |
| 454 | case SNDRV_PCM_TRIGGER_START: |
| 455 | case SNDRV_PCM_TRIGGER_RESUME: |
| 456 | case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| 457 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
Timur Tabi | be41e94 | 2008-07-28 17:04:39 -0500 | [diff] [blame] | 458 | clrbits32(&ssi->scr, CCSR_SSI_SCR_SSIEN); |
| 459 | setbits32(&ssi->scr, |
| 460 | CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE); |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 461 | } else { |
Timur Tabi | be41e94 | 2008-07-28 17:04:39 -0500 | [diff] [blame] | 462 | clrbits32(&ssi->scr, CCSR_SSI_SCR_SSIEN); |
| 463 | setbits32(&ssi->scr, |
| 464 | CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_RE); |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 465 | |
| 466 | /* |
| 467 | * I think we need this delay to allow time for the SSI |
| 468 | * to put data into its FIFO. Without it, ALSA starts |
| 469 | * to complain about overruns. |
| 470 | */ |
Anton Vorontsov | 3a3bd96 | 2008-05-09 13:43:55 +0200 | [diff] [blame] | 471 | mdelay(1); |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 472 | } |
| 473 | break; |
| 474 | |
| 475 | case SNDRV_PCM_TRIGGER_STOP: |
| 476 | case SNDRV_PCM_TRIGGER_SUSPEND: |
| 477 | case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| 478 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| 479 | clrbits32(&ssi->scr, CCSR_SSI_SCR_TE); |
| 480 | else |
| 481 | clrbits32(&ssi->scr, CCSR_SSI_SCR_RE); |
| 482 | break; |
| 483 | |
| 484 | default: |
| 485 | return -EINVAL; |
| 486 | } |
| 487 | |
| 488 | return 0; |
| 489 | } |
| 490 | |
| 491 | /** |
| 492 | * fsl_ssi_shutdown: shutdown the SSI |
| 493 | * |
| 494 | * Shutdown the SSI if there are no other substreams open. |
| 495 | */ |
Mark Brown | dee89c4 | 2008-11-18 22:11:38 +0000 | [diff] [blame] | 496 | static void fsl_ssi_shutdown(struct snd_pcm_substream *substream, |
| 497 | struct snd_soc_dai *dai) |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 498 | { |
| 499 | struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| 500 | struct fsl_ssi_private *ssi_private = rtd->dai->cpu_dai->private_data; |
| 501 | |
| 502 | if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| 503 | ssi_private->playback--; |
| 504 | |
| 505 | if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) |
| 506 | ssi_private->capture--; |
| 507 | |
Timur Tabi | be41e94 | 2008-07-28 17:04:39 -0500 | [diff] [blame] | 508 | if (ssi_private->first_stream == substream) |
| 509 | ssi_private->first_stream = ssi_private->second_stream; |
| 510 | |
| 511 | ssi_private->second_stream = NULL; |
| 512 | |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 513 | /* |
| 514 | * If this is the last active substream, disable the SSI and release |
| 515 | * the IRQ. |
| 516 | */ |
| 517 | if (!ssi_private->playback && !ssi_private->capture) { |
| 518 | struct ccsr_ssi __iomem *ssi = ssi_private->ssi; |
| 519 | |
| 520 | clrbits32(&ssi->scr, CCSR_SSI_SCR_SSIEN); |
| 521 | |
| 522 | free_irq(ssi_private->irq, ssi_private); |
| 523 | } |
| 524 | } |
| 525 | |
| 526 | /** |
| 527 | * fsl_ssi_set_sysclk: set the clock frequency and direction |
| 528 | * |
| 529 | * This function is called by the machine driver to tell us what the clock |
| 530 | * frequency and direction are. |
| 531 | * |
| 532 | * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN), |
| 533 | * and we don't care about the frequency. Return an error if the direction |
| 534 | * is not SND_SOC_CLOCK_IN. |
| 535 | * |
| 536 | * @clk_id: reserved, should be zero |
| 537 | * @freq: the frequency of the given clock ID, currently ignored |
| 538 | * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master) |
| 539 | */ |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 540 | static int fsl_ssi_set_sysclk(struct snd_soc_dai *cpu_dai, |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 541 | int clk_id, unsigned int freq, int dir) |
| 542 | { |
| 543 | |
| 544 | return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL; |
| 545 | } |
| 546 | |
| 547 | /** |
| 548 | * fsl_ssi_set_fmt: set the serial format. |
| 549 | * |
| 550 | * This function is called by the machine driver to tell us what serial |
| 551 | * format to use. |
| 552 | * |
| 553 | * Currently, we only support I2S mode. Return an error if the format is |
| 554 | * not SND_SOC_DAIFMT_I2S. |
| 555 | * |
| 556 | * @format: one of SND_SOC_DAIFMT_xxx |
| 557 | */ |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 558 | static int fsl_ssi_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format) |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 559 | { |
| 560 | return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL; |
| 561 | } |
| 562 | |
| 563 | /** |
| 564 | * fsl_ssi_dai_template: template CPU DAI for the SSI |
| 565 | */ |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 566 | static struct snd_soc_dai fsl_ssi_dai_template = { |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 567 | .playback = { |
| 568 | /* The SSI does not support monaural audio. */ |
| 569 | .channels_min = 2, |
| 570 | .channels_max = 2, |
| 571 | .rates = FSLSSI_I2S_RATES, |
| 572 | .formats = FSLSSI_I2S_FORMATS, |
| 573 | }, |
| 574 | .capture = { |
| 575 | .channels_min = 2, |
| 576 | .channels_max = 2, |
| 577 | .rates = FSLSSI_I2S_RATES, |
| 578 | .formats = FSLSSI_I2S_FORMATS, |
| 579 | }, |
| 580 | .ops = { |
| 581 | .startup = fsl_ssi_startup, |
| 582 | .prepare = fsl_ssi_prepare, |
| 583 | .shutdown = fsl_ssi_shutdown, |
| 584 | .trigger = fsl_ssi_trigger, |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 585 | .set_sysclk = fsl_ssi_set_sysclk, |
| 586 | .set_fmt = fsl_ssi_set_fmt, |
| 587 | }, |
| 588 | }; |
| 589 | |
| 590 | /** |
| 591 | * fsl_sysfs_ssi_show: display SSI statistics |
| 592 | * |
| 593 | * Display the statistics for the current SSI device. |
| 594 | */ |
| 595 | static ssize_t fsl_sysfs_ssi_show(struct device *dev, |
| 596 | struct device_attribute *attr, char *buf) |
| 597 | { |
| 598 | struct fsl_ssi_private *ssi_private = |
| 599 | container_of(attr, struct fsl_ssi_private, dev_attr); |
| 600 | ssize_t length; |
| 601 | |
| 602 | length = sprintf(buf, "rfrc=%u", ssi_private->stats.rfrc); |
| 603 | length += sprintf(buf + length, "\ttfrc=%u", ssi_private->stats.tfrc); |
| 604 | length += sprintf(buf + length, "\tcmdau=%u", ssi_private->stats.cmdau); |
| 605 | length += sprintf(buf + length, "\tcmddu=%u", ssi_private->stats.cmddu); |
| 606 | length += sprintf(buf + length, "\trxt=%u", ssi_private->stats.rxt); |
| 607 | length += sprintf(buf + length, "\trdr1=%u", ssi_private->stats.rdr1); |
| 608 | length += sprintf(buf + length, "\trdr0=%u", ssi_private->stats.rdr0); |
| 609 | length += sprintf(buf + length, "\ttde1=%u", ssi_private->stats.tde1); |
| 610 | length += sprintf(buf + length, "\ttde0=%u", ssi_private->stats.tde0); |
| 611 | length += sprintf(buf + length, "\troe1=%u", ssi_private->stats.roe1); |
| 612 | length += sprintf(buf + length, "\troe0=%u", ssi_private->stats.roe0); |
| 613 | length += sprintf(buf + length, "\ttue1=%u", ssi_private->stats.tue1); |
| 614 | length += sprintf(buf + length, "\ttue0=%u", ssi_private->stats.tue0); |
| 615 | length += sprintf(buf + length, "\ttfs=%u", ssi_private->stats.tfs); |
| 616 | length += sprintf(buf + length, "\trfs=%u", ssi_private->stats.rfs); |
| 617 | length += sprintf(buf + length, "\ttls=%u", ssi_private->stats.tls); |
| 618 | length += sprintf(buf + length, "\trls=%u", ssi_private->stats.rls); |
| 619 | length += sprintf(buf + length, "\trff1=%u", ssi_private->stats.rff1); |
| 620 | length += sprintf(buf + length, "\trff0=%u", ssi_private->stats.rff0); |
| 621 | length += sprintf(buf + length, "\ttfe1=%u", ssi_private->stats.tfe1); |
| 622 | length += sprintf(buf + length, "\ttfe0=%u\n", ssi_private->stats.tfe0); |
| 623 | |
| 624 | return length; |
| 625 | } |
| 626 | |
| 627 | /** |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 628 | * fsl_ssi_create_dai: create a snd_soc_dai structure |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 629 | * |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 630 | * This function is called by the machine driver to create a snd_soc_dai |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 631 | * structure. The function creates an ssi_private object, which contains |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 632 | * the snd_soc_dai. It also creates the sysfs statistics device. |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 633 | */ |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 634 | struct snd_soc_dai *fsl_ssi_create_dai(struct fsl_ssi_info *ssi_info) |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 635 | { |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 636 | struct snd_soc_dai *fsl_ssi_dai; |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 637 | struct fsl_ssi_private *ssi_private; |
| 638 | int ret = 0; |
| 639 | struct device_attribute *dev_attr; |
| 640 | |
| 641 | ssi_private = kzalloc(sizeof(struct fsl_ssi_private), GFP_KERNEL); |
| 642 | if (!ssi_private) { |
| 643 | dev_err(ssi_info->dev, "could not allocate DAI object\n"); |
| 644 | return NULL; |
| 645 | } |
| 646 | memcpy(&ssi_private->cpu_dai, &fsl_ssi_dai_template, |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 647 | sizeof(struct snd_soc_dai)); |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 648 | |
| 649 | fsl_ssi_dai = &ssi_private->cpu_dai; |
| 650 | dev_attr = &ssi_private->dev_attr; |
| 651 | |
| 652 | sprintf(ssi_private->name, "ssi%u", (u8) ssi_info->id); |
| 653 | ssi_private->ssi = ssi_info->ssi; |
| 654 | ssi_private->ssi_phys = ssi_info->ssi_phys; |
| 655 | ssi_private->irq = ssi_info->irq; |
| 656 | ssi_private->dev = ssi_info->dev; |
| 657 | |
| 658 | ssi_private->dev->driver_data = fsl_ssi_dai; |
| 659 | |
| 660 | /* Initialize the the device_attribute structure */ |
| 661 | dev_attr->attr.name = "ssi-stats"; |
| 662 | dev_attr->attr.mode = S_IRUGO; |
| 663 | dev_attr->show = fsl_sysfs_ssi_show; |
| 664 | |
| 665 | ret = device_create_file(ssi_private->dev, dev_attr); |
| 666 | if (ret) { |
| 667 | dev_err(ssi_info->dev, "could not create sysfs %s file\n", |
| 668 | ssi_private->dev_attr.attr.name); |
| 669 | kfree(fsl_ssi_dai); |
| 670 | return NULL; |
| 671 | } |
| 672 | |
| 673 | fsl_ssi_dai->private_data = ssi_private; |
| 674 | fsl_ssi_dai->name = ssi_private->name; |
| 675 | fsl_ssi_dai->id = ssi_info->id; |
Mark Brown | 3f4b783 | 2008-12-03 19:26:35 +0000 | [diff] [blame] | 676 | fsl_ssi_dai->dev = ssi_info->dev; |
| 677 | |
| 678 | ret = snd_soc_register_dai(fsl_ssi_dai); |
| 679 | if (ret != 0) { |
| 680 | dev_err(ssi_info->dev, "failed to register DAI: %d\n", ret); |
| 681 | kfree(fsl_ssi_dai); |
| 682 | return NULL; |
| 683 | } |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 684 | |
| 685 | return fsl_ssi_dai; |
| 686 | } |
| 687 | EXPORT_SYMBOL_GPL(fsl_ssi_create_dai); |
| 688 | |
| 689 | /** |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 690 | * fsl_ssi_destroy_dai: destroy the snd_soc_dai object |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 691 | * |
| 692 | * This function undoes the operations of fsl_ssi_create_dai() |
| 693 | */ |
Liam Girdwood | 8cf7b2b | 2008-07-07 16:08:00 +0100 | [diff] [blame] | 694 | void fsl_ssi_destroy_dai(struct snd_soc_dai *fsl_ssi_dai) |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 695 | { |
| 696 | struct fsl_ssi_private *ssi_private = |
| 697 | container_of(fsl_ssi_dai, struct fsl_ssi_private, cpu_dai); |
| 698 | |
| 699 | device_remove_file(ssi_private->dev, &ssi_private->dev_attr); |
| 700 | |
Mark Brown | 3f4b783 | 2008-12-03 19:26:35 +0000 | [diff] [blame] | 701 | snd_soc_unregister_dai(&ssi_private->cpu_dai); |
| 702 | |
Timur Tabi | 17467f2 | 2008-01-11 18:15:26 +0100 | [diff] [blame] | 703 | kfree(ssi_private); |
| 704 | } |
| 705 | EXPORT_SYMBOL_GPL(fsl_ssi_destroy_dai); |
| 706 | |
| 707 | MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); |
| 708 | MODULE_DESCRIPTION("Freescale Synchronous Serial Interface (SSI) ASoC Driver"); |
| 709 | MODULE_LICENSE("GPL"); |