1/* 2 * Freescale SSI ALSA SoC Digital Audio Interface (DAI) driver 3 * 4 * Author: Timur Tabi <timur@freescale.com> 5 * 6 * Copyright 2007-2010 Freescale Semiconductor, Inc. 7 * 8 * This file is licensed under the terms of the GNU General Public License 9 * version 2. This program is licensed "as is" without any warranty of any 10 * kind, whether express or implied. 11 * 12 * 13 * Some notes why imx-pcm-fiq is used instead of DMA on some boards: 14 * 15 * The i.MX SSI core has some nasty limitations in AC97 mode. While most 16 * sane processor vendors have a FIFO per AC97 slot, the i.MX has only 17 * one FIFO which combines all valid receive slots. We cannot even select 18 * which slots we want to receive. The WM9712 with which this driver 19 * was developed with always sends GPIO status data in slot 12 which 20 * we receive in our (PCM-) data stream. The only chance we have is to 21 * manually skip this data in the FIQ handler. With sampling rates different 22 * from 48000Hz not every frame has valid receive data, so the ratio 23 * between pcm data and GPIO status data changes. Our FIQ handler is not 24 * able to handle this, hence this driver only works with 48000Hz sampling 25 * rate. 26 * Reading and writing AC97 registers is another challenge. The core 27 * provides us status bits when the read register is updated with *another* 28 * value. When we read the same register two times (and the register still 29 * contains the same value) these status bits are not set. We work 30 * around this by not polling these bits but only wait a fixed delay. 31 */ 32 33#include <linux/init.h> 34#include <linux/io.h> 35#include <linux/module.h> 36#include <linux/interrupt.h> 37#include <linux/clk.h> 38#include <linux/device.h> 39#include <linux/delay.h> 40#include <linux/slab.h> 41#include <linux/spinlock.h> 42#include <linux/of.h> 43#include <linux/of_address.h> 44#include <linux/of_irq.h> 45#include <linux/of_platform.h> 46 47#include <sound/core.h> 48#include <sound/pcm.h> 49#include <sound/pcm_params.h> 50#include <sound/initval.h> 51#include <sound/soc.h> 52#include <sound/dmaengine_pcm.h> 53 54#include "fsl_ssi.h" 55#include "imx-pcm.h" 56 57/** 58 * FSLSSI_I2S_RATES: sample rates supported by the I2S 59 * 60 * This driver currently only supports the SSI running in I2S slave mode, 61 * which means the codec determines the sample rate. Therefore, we tell 62 * ALSA that we support all rates and let the codec driver decide what rates 63 * are really supported. 64 */ 65#define FSLSSI_I2S_RATES SNDRV_PCM_RATE_CONTINUOUS 66 67/** 68 * FSLSSI_I2S_FORMATS: audio formats supported by the SSI 69 * 70 * The SSI has a limitation in that the samples must be in the same byte 71 * order as the host CPU. This is because when multiple bytes are written 72 * to the STX register, the bytes and bits must be written in the same 73 * order. The STX is a shift register, so all the bits need to be aligned 74 * (bit-endianness must match byte-endianness). Processors typically write 75 * the bits within a byte in the same order that the bytes of a word are 76 * written in. So if the host CPU is big-endian, then only big-endian 77 * samples will be written to STX properly. 78 */ 79#ifdef __BIG_ENDIAN 80#define FSLSSI_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \ 81 SNDRV_PCM_FMTBIT_S18_3BE | SNDRV_PCM_FMTBIT_S20_3BE | \ 82 SNDRV_PCM_FMTBIT_S24_3BE | SNDRV_PCM_FMTBIT_S24_BE) 83#else 84#define FSLSSI_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | \ 85 SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S20_3LE | \ 86 SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE) 87#endif 88 89#define FSLSSI_SIER_DBG_RX_FLAGS (CCSR_SSI_SIER_RFF0_EN | \ 90 CCSR_SSI_SIER_RLS_EN | CCSR_SSI_SIER_RFS_EN | \ 91 CCSR_SSI_SIER_ROE0_EN | CCSR_SSI_SIER_RFRC_EN) 92#define FSLSSI_SIER_DBG_TX_FLAGS (CCSR_SSI_SIER_TFE0_EN | \ 93 CCSR_SSI_SIER_TLS_EN | CCSR_SSI_SIER_TFS_EN | \ 94 CCSR_SSI_SIER_TUE0_EN | CCSR_SSI_SIER_TFRC_EN) 95 96enum fsl_ssi_type { 97 FSL_SSI_MCP8610, 98 FSL_SSI_MX21, 99 FSL_SSI_MX35, 100 FSL_SSI_MX51, 101}; 102 103struct fsl_ssi_reg_val { 104 u32 sier; 105 u32 srcr; 106 u32 stcr; 107 u32 scr; 108}; 109 110struct fsl_ssi_rxtx_reg_val { 111 struct fsl_ssi_reg_val rx; 112 struct fsl_ssi_reg_val tx; 113}; 114static const struct regmap_config fsl_ssi_regconfig = { 115 .max_register = CCSR_SSI_SACCDIS, 116 .reg_bits = 32, 117 .val_bits = 32, 118 .reg_stride = 4, 119 .val_format_endian = REGMAP_ENDIAN_NATIVE, 120}; 121 122struct fsl_ssi_soc_data { 123 bool imx; 124 bool offline_config; 125 u32 sisr_write_mask; 126}; 127 128/** 129 * fsl_ssi_private: per-SSI private data 130 * 131 * @reg: Pointer to the regmap registers 132 * @irq: IRQ of this SSI 133 * @cpu_dai_drv: CPU DAI driver for this device 134 * 135 * @dai_fmt: DAI configuration this device is currently used with 136 * @i2s_mode: i2s and network mode configuration of the device. Is used to 137 * switch between normal and i2s/network mode 138 * mode depending on the number of channels 139 * @use_dma: DMA is used or FIQ with stream filter 140 * @use_dual_fifo: DMA with support for both FIFOs used 141 * @fifo_deph: Depth of the SSI FIFOs 142 * @rxtx_reg_val: Specific register settings for receive/transmit configuration 143 * 144 * @clk: SSI clock 145 * @baudclk: SSI baud clock for master mode 146 * @baudclk_streams: Active streams that are using baudclk 147 * @bitclk_freq: bitclock frequency set by .set_dai_sysclk 148 * 149 * @dma_params_tx: DMA transmit parameters 150 * @dma_params_rx: DMA receive parameters 151 * @ssi_phys: physical address of the SSI registers 152 * 153 * @fiq_params: FIQ stream filtering parameters 154 * 155 * @pdev: Pointer to pdev used for deprecated fsl-ssi sound card 156 * 157 * @dbg_stats: Debugging statistics 158 * 159 * @soc: SoC specifc data 160 */ 161struct fsl_ssi_private { 162 struct regmap *regs; 163 int irq; 164 struct snd_soc_dai_driver cpu_dai_drv; 165 166 unsigned int dai_fmt; 167 u8 i2s_mode; 168 bool use_dma; 169 bool use_dual_fifo; 170 bool has_ipg_clk_name; 171 unsigned int fifo_depth; 172 struct fsl_ssi_rxtx_reg_val rxtx_reg_val; 173 174 struct clk *clk; 175 struct clk *baudclk; 176 unsigned int baudclk_streams; 177 unsigned int bitclk_freq; 178 179 /* DMA params */ 180 struct snd_dmaengine_dai_dma_data dma_params_tx; 181 struct snd_dmaengine_dai_dma_data dma_params_rx; 182 dma_addr_t ssi_phys; 183 184 /* params for non-dma FIQ stream filtered mode */ 185 struct imx_pcm_fiq_params fiq_params; 186 187 /* Used when using fsl-ssi as sound-card. This is only used by ppc and 188 * should be replaced with simple-sound-card. */ 189 struct platform_device *pdev; 190 191 struct fsl_ssi_dbg dbg_stats; 192 193 const struct fsl_ssi_soc_data *soc; 194}; 195 196/* 197 * imx51 and later SoCs have a slightly different IP that allows the 198 * SSI configuration while the SSI unit is running. 199 * 200 * More important, it is necessary on those SoCs to configure the 201 * sperate TX/RX DMA bits just before starting the stream 202 * (fsl_ssi_trigger). The SDMA unit has to be configured before fsl_ssi 203 * sends any DMA requests to the SDMA unit, otherwise it is not defined 204 * how the SDMA unit handles the DMA request. 205 * 206 * SDMA units are present on devices starting at imx35 but the imx35 207 * reference manual states that the DMA bits should not be changed 208 * while the SSI unit is running (SSIEN). So we support the necessary 209 * online configuration of fsl-ssi starting at imx51. 210 */ 211 212static struct fsl_ssi_soc_data fsl_ssi_mpc8610 = { 213 .imx = false, 214 .offline_config = true, 215 .sisr_write_mask = CCSR_SSI_SISR_RFRC | CCSR_SSI_SISR_TFRC | 216 CCSR_SSI_SISR_ROE0 | CCSR_SSI_SISR_ROE1 | 217 CCSR_SSI_SISR_TUE0 | CCSR_SSI_SISR_TUE1, 218}; 219 220static struct fsl_ssi_soc_data fsl_ssi_imx21 = { 221 .imx = true, 222 .offline_config = true, 223 .sisr_write_mask = 0, 224}; 225 226static struct fsl_ssi_soc_data fsl_ssi_imx35 = { 227 .imx = true, 228 .offline_config = true, 229 .sisr_write_mask = CCSR_SSI_SISR_RFRC | CCSR_SSI_SISR_TFRC | 230 CCSR_SSI_SISR_ROE0 | CCSR_SSI_SISR_ROE1 | 231 CCSR_SSI_SISR_TUE0 | CCSR_SSI_SISR_TUE1, 232}; 233 234static struct fsl_ssi_soc_data fsl_ssi_imx51 = { 235 .imx = true, 236 .offline_config = false, 237 .sisr_write_mask = CCSR_SSI_SISR_ROE0 | CCSR_SSI_SISR_ROE1 | 238 CCSR_SSI_SISR_TUE0 | CCSR_SSI_SISR_TUE1, 239}; 240 241static const struct of_device_id fsl_ssi_ids[] = { 242 { .compatible = "fsl,mpc8610-ssi", .data = &fsl_ssi_mpc8610 }, 243 { .compatible = "fsl,imx51-ssi", .data = &fsl_ssi_imx51 }, 244 { .compatible = "fsl,imx35-ssi", .data = &fsl_ssi_imx35 }, 245 { .compatible = "fsl,imx21-ssi", .data = &fsl_ssi_imx21 }, 246 {} 247}; 248MODULE_DEVICE_TABLE(of, fsl_ssi_ids); 249 250static bool fsl_ssi_is_ac97(struct fsl_ssi_private *ssi_private) 251{ 252 return !!(ssi_private->dai_fmt & SND_SOC_DAIFMT_AC97); 253} 254 255static bool fsl_ssi_is_i2s_master(struct fsl_ssi_private *ssi_private) 256{ 257 return (ssi_private->dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) == 258 SND_SOC_DAIFMT_CBS_CFS; 259} 260 261static bool fsl_ssi_is_i2s_cbm_cfs(struct fsl_ssi_private *ssi_private) 262{ 263 return (ssi_private->dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) == 264 SND_SOC_DAIFMT_CBM_CFS; 265} 266/** 267 * fsl_ssi_isr: SSI interrupt handler 268 * 269 * Although it's possible to use the interrupt handler to send and receive 270 * data to/from the SSI, we use the DMA instead. Programming is more 271 * complicated, but the performance is much better. 272 * 273 * This interrupt handler is used only to gather statistics. 274 * 275 * @irq: IRQ of the SSI device 276 * @dev_id: pointer to the ssi_private structure for this SSI device 277 */ 278static irqreturn_t fsl_ssi_isr(int irq, void *dev_id) 279{ 280 struct fsl_ssi_private *ssi_private = dev_id; 281 struct regmap *regs = ssi_private->regs; 282 __be32 sisr; 283 __be32 sisr2; 284 285 /* We got an interrupt, so read the status register to see what we 286 were interrupted for. We mask it with the Interrupt Enable register 287 so that we only check for events that we're interested in. 288 */ 289 regmap_read(regs, CCSR_SSI_SISR, &sisr); 290 291 sisr2 = sisr & ssi_private->soc->sisr_write_mask; 292 /* Clear the bits that we set */ 293 if (sisr2) 294 regmap_write(regs, CCSR_SSI_SISR, sisr2); 295 296 fsl_ssi_dbg_isr(&ssi_private->dbg_stats, sisr); 297 298 return IRQ_HANDLED; 299} 300 301/* 302 * Enable/Disable all rx/tx config flags at once. 303 */ 304static void fsl_ssi_rxtx_config(struct fsl_ssi_private *ssi_private, 305 bool enable) 306{ 307 struct regmap *regs = ssi_private->regs; 308 struct fsl_ssi_rxtx_reg_val *vals = &ssi_private->rxtx_reg_val; 309 310 if (enable) { 311 regmap_update_bits(regs, CCSR_SSI_SIER, 312 vals->rx.sier | vals->tx.sier, 313 vals->rx.sier | vals->tx.sier); 314 regmap_update_bits(regs, CCSR_SSI_SRCR, 315 vals->rx.srcr | vals->tx.srcr, 316 vals->rx.srcr | vals->tx.srcr); 317 regmap_update_bits(regs, CCSR_SSI_STCR, 318 vals->rx.stcr | vals->tx.stcr, 319 vals->rx.stcr | vals->tx.stcr); 320 } else { 321 regmap_update_bits(regs, CCSR_SSI_SRCR, 322 vals->rx.srcr | vals->tx.srcr, 0); 323 regmap_update_bits(regs, CCSR_SSI_STCR, 324 vals->rx.stcr | vals->tx.stcr, 0); 325 regmap_update_bits(regs, CCSR_SSI_SIER, 326 vals->rx.sier | vals->tx.sier, 0); 327 } 328} 329 330/* 331 * Calculate the bits that have to be disabled for the current stream that is 332 * getting disabled. This keeps the bits enabled that are necessary for the 333 * second stream to work if 'stream_active' is true. 334 * 335 * Detailed calculation: 336 * These are the values that need to be active after disabling. For non-active 337 * second stream, this is 0: 338 * vals_stream * !!stream_active 339 * 340 * The following computes the overall differences between the setup for the 341 * to-disable stream and the active stream, a simple XOR: 342 * vals_disable ^ (vals_stream * !!(stream_active)) 343 * 344 * The full expression adds a mask on all values we care about 345 */ 346#define fsl_ssi_disable_val(vals_disable, vals_stream, stream_active) \ 347 ((vals_disable) & \ 348 ((vals_disable) ^ ((vals_stream) * (u32)!!(stream_active)))) 349 350/* 351 * Enable/Disable a ssi configuration. You have to pass either 352 * ssi_private->rxtx_reg_val.rx or tx as vals parameter. 353 */ 354static void fsl_ssi_config(struct fsl_ssi_private *ssi_private, bool enable, 355 struct fsl_ssi_reg_val *vals) 356{ 357 struct regmap *regs = ssi_private->regs; 358 struct fsl_ssi_reg_val *avals; 359 int nr_active_streams; 360 u32 scr_val; 361 int keep_active; 362 363 regmap_read(regs, CCSR_SSI_SCR, &scr_val); 364 365 nr_active_streams = !!(scr_val & CCSR_SSI_SCR_TE) + 366 !!(scr_val & CCSR_SSI_SCR_RE); 367 368 if (nr_active_streams - 1 > 0) 369 keep_active = 1; 370 else 371 keep_active = 0; 372 373 /* Find the other direction values rx or tx which we do not want to 374 * modify */ 375 if (&ssi_private->rxtx_reg_val.rx == vals) 376 avals = &ssi_private->rxtx_reg_val.tx; 377 else 378 avals = &ssi_private->rxtx_reg_val.rx; 379 380 /* If vals should be disabled, start with disabling the unit */ 381 if (!enable) { 382 u32 scr = fsl_ssi_disable_val(vals->scr, avals->scr, 383 keep_active); 384 regmap_update_bits(regs, CCSR_SSI_SCR, scr, 0); 385 } 386 387 /* 388 * We are running on a SoC which does not support online SSI 389 * reconfiguration, so we have to enable all necessary flags at once 390 * even if we do not use them later (capture and playback configuration) 391 */ 392 if (ssi_private->soc->offline_config) { 393 if ((enable && !nr_active_streams) || 394 (!enable && !keep_active)) 395 fsl_ssi_rxtx_config(ssi_private, enable); 396 397 goto config_done; 398 } 399 400 /* 401 * Configure single direction units while the SSI unit is running 402 * (online configuration) 403 */ 404 if (enable) { 405 regmap_update_bits(regs, CCSR_SSI_SIER, vals->sier, vals->sier); 406 regmap_update_bits(regs, CCSR_SSI_SRCR, vals->srcr, vals->srcr); 407 regmap_update_bits(regs, CCSR_SSI_STCR, vals->stcr, vals->stcr); 408 } else { 409 u32 sier; 410 u32 srcr; 411 u32 stcr; 412 413 /* 414 * Disabling the necessary flags for one of rx/tx while the 415 * other stream is active is a little bit more difficult. We 416 * have to disable only those flags that differ between both 417 * streams (rx XOR tx) and that are set in the stream that is 418 * disabled now. Otherwise we could alter flags of the other 419 * stream 420 */ 421 422 /* These assignments are simply vals without bits set in avals*/ 423 sier = fsl_ssi_disable_val(vals->sier, avals->sier, 424 keep_active); 425 srcr = fsl_ssi_disable_val(vals->srcr, avals->srcr, 426 keep_active); 427 stcr = fsl_ssi_disable_val(vals->stcr, avals->stcr, 428 keep_active); 429 430 regmap_update_bits(regs, CCSR_SSI_SRCR, srcr, 0); 431 regmap_update_bits(regs, CCSR_SSI_STCR, stcr, 0); 432 regmap_update_bits(regs, CCSR_SSI_SIER, sier, 0); 433 } 434 435config_done: 436 /* Enabling of subunits is done after configuration */ 437 if (enable) 438 regmap_update_bits(regs, CCSR_SSI_SCR, vals->scr, vals->scr); 439} 440 441 442static void fsl_ssi_rx_config(struct fsl_ssi_private *ssi_private, bool enable) 443{ 444 fsl_ssi_config(ssi_private, enable, &ssi_private->rxtx_reg_val.rx); 445} 446 447static void fsl_ssi_tx_config(struct fsl_ssi_private *ssi_private, bool enable) 448{ 449 fsl_ssi_config(ssi_private, enable, &ssi_private->rxtx_reg_val.tx); 450} 451 452/* 453 * Setup rx/tx register values used to enable/disable the streams. These will 454 * be used later in fsl_ssi_config to setup the streams without the need to 455 * check for all different SSI modes. 456 */ 457static void fsl_ssi_setup_reg_vals(struct fsl_ssi_private *ssi_private) 458{ 459 struct fsl_ssi_rxtx_reg_val *reg = &ssi_private->rxtx_reg_val; 460 461 reg->rx.sier = CCSR_SSI_SIER_RFF0_EN; 462 reg->rx.srcr = CCSR_SSI_SRCR_RFEN0; 463 reg->rx.scr = 0; 464 reg->tx.sier = CCSR_SSI_SIER_TFE0_EN; 465 reg->tx.stcr = CCSR_SSI_STCR_TFEN0; 466 reg->tx.scr = 0; 467 468 if (!fsl_ssi_is_ac97(ssi_private)) { 469 reg->rx.scr = CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_RE; 470 reg->rx.sier |= CCSR_SSI_SIER_RFF0_EN; 471 reg->tx.scr = CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE; 472 reg->tx.sier |= CCSR_SSI_SIER_TFE0_EN; 473 } 474 475 if (ssi_private->use_dma) { 476 reg->rx.sier |= CCSR_SSI_SIER_RDMAE; 477 reg->tx.sier |= CCSR_SSI_SIER_TDMAE; 478 } else { 479 reg->rx.sier |= CCSR_SSI_SIER_RIE; 480 reg->tx.sier |= CCSR_SSI_SIER_TIE; 481 } 482 483 reg->rx.sier |= FSLSSI_SIER_DBG_RX_FLAGS; 484 reg->tx.sier |= FSLSSI_SIER_DBG_TX_FLAGS; 485} 486 487static void fsl_ssi_setup_ac97(struct fsl_ssi_private *ssi_private) 488{ 489 struct regmap *regs = ssi_private->regs; 490 491 /* 492 * Setup the clock control register 493 */ 494 regmap_write(regs, CCSR_SSI_STCCR, 495 CCSR_SSI_SxCCR_WL(17) | CCSR_SSI_SxCCR_DC(13)); 496 regmap_write(regs, CCSR_SSI_SRCCR, 497 CCSR_SSI_SxCCR_WL(17) | CCSR_SSI_SxCCR_DC(13)); 498 499 /* 500 * Enable AC97 mode and startup the SSI 501 */ 502 regmap_write(regs, CCSR_SSI_SACNT, 503 CCSR_SSI_SACNT_AC97EN | CCSR_SSI_SACNT_FV); 504 regmap_write(regs, CCSR_SSI_SACCDIS, 0xff); 505 regmap_write(regs, CCSR_SSI_SACCEN, 0x300); 506 507 /* 508 * Enable SSI, Transmit and Receive. AC97 has to communicate with the 509 * codec before a stream is started. 510 */ 511 regmap_update_bits(regs, CCSR_SSI_SCR, 512 CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE | CCSR_SSI_SCR_RE, 513 CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE | CCSR_SSI_SCR_RE); 514 515 regmap_write(regs, CCSR_SSI_SOR, CCSR_SSI_SOR_WAIT(3)); 516} 517 518/** 519 * fsl_ssi_startup: create a new substream 520 * 521 * This is the first function called when a stream is opened. 522 * 523 * If this is the first stream open, then grab the IRQ and program most of 524 * the SSI registers. 525 */ 526static int fsl_ssi_startup(struct snd_pcm_substream *substream, 527 struct snd_soc_dai *dai) 528{ 529 struct snd_soc_pcm_runtime *rtd = substream->private_data; 530 struct fsl_ssi_private *ssi_private = 531 snd_soc_dai_get_drvdata(rtd->cpu_dai); 532 int ret; 533 534 ret = clk_prepare_enable(ssi_private->clk); 535 if (ret) 536 return ret; 537 538 /* When using dual fifo mode, it is safer to ensure an even period 539 * size. If appearing to an odd number while DMA always starts its 540 * task from fifo0, fifo1 would be neglected at the end of each 541 * period. But SSI would still access fifo1 with an invalid data. 542 */ 543 if (ssi_private->use_dual_fifo) 544 snd_pcm_hw_constraint_step(substream->runtime, 0, 545 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2); 546 547 return 0; 548} 549 550/** 551 * fsl_ssi_shutdown: shutdown the SSI 552 * 553 */ 554static void fsl_ssi_shutdown(struct snd_pcm_substream *substream, 555 struct snd_soc_dai *dai) 556{ 557 struct snd_soc_pcm_runtime *rtd = substream->private_data; 558 struct fsl_ssi_private *ssi_private = 559 snd_soc_dai_get_drvdata(rtd->cpu_dai); 560 561 clk_disable_unprepare(ssi_private->clk); 562 563} 564 565/** 566 * fsl_ssi_set_bclk - configure Digital Audio Interface bit clock 567 * 568 * Note: This function can be only called when using SSI as DAI master 569 * 570 * Quick instruction for parameters: 571 * freq: Output BCLK frequency = samplerate * 32 (fixed) * channels 572 * dir: SND_SOC_CLOCK_OUT -> TxBCLK, SND_SOC_CLOCK_IN -> RxBCLK. 573 */ 574static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream, 575 struct snd_soc_dai *cpu_dai, 576 struct snd_pcm_hw_params *hw_params) 577{ 578 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai); 579 struct regmap *regs = ssi_private->regs; 580 int synchronous = ssi_private->cpu_dai_drv.symmetric_rates, ret; 581 u32 pm = 999, div2, psr, stccr, mask, afreq, factor, i; 582 unsigned long clkrate, baudrate, tmprate; 583 u64 sub, savesub = 100000; 584 unsigned int freq; 585 bool baudclk_is_used; 586 587 /* Prefer the explicitly set bitclock frequency */ 588 if (ssi_private->bitclk_freq) 589 freq = ssi_private->bitclk_freq; 590 else 591 freq = params_channels(hw_params) * 32 * params_rate(hw_params); 592 593 /* Don't apply it to any non-baudclk circumstance */ 594 if (IS_ERR(ssi_private->baudclk)) 595 return -EINVAL; 596 597 baudclk_is_used = ssi_private->baudclk_streams & ~(BIT(substream->stream)); 598 599 /* It should be already enough to divide clock by setting pm alone */ 600 psr = 0; 601 div2 = 0; 602 603 factor = (div2 + 1) * (7 * psr + 1) * 2; 604 605 for (i = 0; i < 255; i++) { 606 tmprate = freq * factor * (i + 1); 607 608 if (baudclk_is_used) 609 clkrate = clk_get_rate(ssi_private->baudclk); 610 else 611 clkrate = clk_round_rate(ssi_private->baudclk, tmprate); 612 613 /* 614 * Hardware limitation: The bclk rate must be 615 * never greater than 1/5 IPG clock rate 616 */ 617 if (clkrate * 5 > clk_get_rate(ssi_private->clk)) 618 continue; 619 620 clkrate /= factor; 621 afreq = clkrate / (i + 1); 622 623 if (freq == afreq) 624 sub = 0; 625 else if (freq / afreq == 1) 626 sub = freq - afreq; 627 else if (afreq / freq == 1) 628 sub = afreq - freq; 629 else 630 continue; 631 632 /* Calculate the fraction */ 633 sub *= 100000; 634 do_div(sub, freq); 635 636 if (sub < savesub) { 637 baudrate = tmprate; 638 savesub = sub; 639 pm = i; 640 } 641 642 /* We are lucky */ 643 if (savesub == 0) 644 break; 645 } 646 647 /* No proper pm found if it is still remaining the initial value */ 648 if (pm == 999) { 649 dev_err(cpu_dai->dev, "failed to handle the required sysclk\n"); 650 return -EINVAL; 651 } 652 653 stccr = CCSR_SSI_SxCCR_PM(pm + 1) | (div2 ? CCSR_SSI_SxCCR_DIV2 : 0) | 654 (psr ? CCSR_SSI_SxCCR_PSR : 0); 655 mask = CCSR_SSI_SxCCR_PM_MASK | CCSR_SSI_SxCCR_DIV2 | 656 CCSR_SSI_SxCCR_PSR; 657 658 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK || synchronous) 659 regmap_update_bits(regs, CCSR_SSI_STCCR, mask, stccr); 660 else 661 regmap_update_bits(regs, CCSR_SSI_SRCCR, mask, stccr); 662 663 if (!baudclk_is_used) { 664 ret = clk_set_rate(ssi_private->baudclk, baudrate); 665 if (ret) { 666 dev_err(cpu_dai->dev, "failed to set baudclk rate\n"); 667 return -EINVAL; 668 } 669 } 670 671 return 0; 672} 673 674static int fsl_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai, 675 int clk_id, unsigned int freq, int dir) 676{ 677 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai); 678 679 ssi_private->bitclk_freq = freq; 680 681 return 0; 682} 683 684/** 685 * fsl_ssi_hw_params - program the sample size 686 * 687 * Most of the SSI registers have been programmed in the startup function, 688 * but the word length must be programmed here. Unfortunately, programming 689 * the SxCCR.WL bits requires the SSI to be temporarily disabled. This can 690 * cause a problem with supporting simultaneous playback and capture. If 691 * the SSI is already playing a stream, then that stream may be temporarily 692 * stopped when you start capture. 693 * 694 * Note: The SxCCR.DC and SxCCR.PM bits are only used if the SSI is the 695 * clock master. 696 */ 697static int fsl_ssi_hw_params(struct snd_pcm_substream *substream, 698 struct snd_pcm_hw_params *hw_params, struct snd_soc_dai *cpu_dai) 699{ 700 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai); 701 struct regmap *regs = ssi_private->regs; 702 unsigned int channels = params_channels(hw_params); 703 unsigned int sample_size = 704 snd_pcm_format_width(params_format(hw_params)); 705 u32 wl = CCSR_SSI_SxCCR_WL(sample_size); 706 int ret; 707 u32 scr_val; 708 int enabled; 709 710 regmap_read(regs, CCSR_SSI_SCR, &scr_val); 711 enabled = scr_val & CCSR_SSI_SCR_SSIEN; 712 713 /* 714 * If we're in synchronous mode, and the SSI is already enabled, 715 * then STCCR is already set properly. 716 */ 717 if (enabled && ssi_private->cpu_dai_drv.symmetric_rates) 718 return 0; 719 720 if (fsl_ssi_is_i2s_master(ssi_private)) { 721 ret = fsl_ssi_set_bclk(substream, cpu_dai, hw_params); 722 if (ret) 723 return ret; 724 725 /* Do not enable the clock if it is already enabled */ 726 if (!(ssi_private->baudclk_streams & BIT(substream->stream))) { 727 ret = clk_prepare_enable(ssi_private->baudclk); 728 if (ret) 729 return ret; 730 731 ssi_private->baudclk_streams |= BIT(substream->stream); 732 } 733 } 734 735 if (!fsl_ssi_is_ac97(ssi_private)) { 736 u8 i2smode; 737 /* 738 * Switch to normal net mode in order to have a frame sync 739 * signal every 32 bits instead of 16 bits 740 */ 741 if (fsl_ssi_is_i2s_cbm_cfs(ssi_private) && sample_size == 16) 742 i2smode = CCSR_SSI_SCR_I2S_MODE_NORMAL | 743 CCSR_SSI_SCR_NET; 744 else 745 i2smode = ssi_private->i2s_mode; 746 747 regmap_update_bits(regs, CCSR_SSI_SCR, 748 CCSR_SSI_SCR_NET | CCSR_SSI_SCR_I2S_MODE_MASK, 749 channels == 1 ? 0 : i2smode); 750 } 751 752 /* 753 * FIXME: The documentation says that SxCCR[WL] should not be 754 * modified while the SSI is enabled. The only time this can 755 * happen is if we're trying to do simultaneous playback and 756 * capture in asynchronous mode. Unfortunately, I have been enable 757 * to get that to work at all on the P1022DS. Therefore, we don't 758 * bother to disable/enable the SSI when setting SxCCR[WL], because 759 * the SSI will stop anyway. Maybe one day, this will get fixed. 760 */ 761 762 /* In synchronous mode, the SSI uses STCCR for capture */ 763 if ((substream->stream == SNDRV_PCM_STREAM_PLAYBACK) || 764 ssi_private->cpu_dai_drv.symmetric_rates) 765 regmap_update_bits(regs, CCSR_SSI_STCCR, CCSR_SSI_SxCCR_WL_MASK, 766 wl); 767 else 768 regmap_update_bits(regs, CCSR_SSI_SRCCR, CCSR_SSI_SxCCR_WL_MASK, 769 wl); 770 771 return 0; 772} 773 774static int fsl_ssi_hw_free(struct snd_pcm_substream *substream, 775 struct snd_soc_dai *cpu_dai) 776{ 777 struct snd_soc_pcm_runtime *rtd = substream->private_data; 778 struct fsl_ssi_private *ssi_private = 779 snd_soc_dai_get_drvdata(rtd->cpu_dai); 780 781 if (fsl_ssi_is_i2s_master(ssi_private) && 782 ssi_private->baudclk_streams & BIT(substream->stream)) { 783 clk_disable_unprepare(ssi_private->baudclk); 784 ssi_private->baudclk_streams &= ~BIT(substream->stream); 785 } 786 787 return 0; 788} 789 790static int _fsl_ssi_set_dai_fmt(struct device *dev, 791 struct fsl_ssi_private *ssi_private, 792 unsigned int fmt) 793{ 794 struct regmap *regs = ssi_private->regs; 795 u32 strcr = 0, stcr, srcr, scr, mask; 796 u8 wm; 797 798 ssi_private->dai_fmt = fmt; 799 800 if (fsl_ssi_is_i2s_master(ssi_private) && IS_ERR(ssi_private->baudclk)) { 801 dev_err(dev, "baudclk is missing which is necessary for master mode\n"); 802 return -EINVAL; 803 } 804 805 fsl_ssi_setup_reg_vals(ssi_private); 806 807 regmap_read(regs, CCSR_SSI_SCR, &scr); 808 scr &= ~(CCSR_SSI_SCR_SYN | CCSR_SSI_SCR_I2S_MODE_MASK); 809 scr |= CCSR_SSI_SCR_SYNC_TX_FS; 810 811 mask = CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TFDIR | CCSR_SSI_STCR_TXDIR | 812 CCSR_SSI_STCR_TSCKP | CCSR_SSI_STCR_TFSI | CCSR_SSI_STCR_TFSL | 813 CCSR_SSI_STCR_TEFS; 814 regmap_read(regs, CCSR_SSI_STCR, &stcr); 815 regmap_read(regs, CCSR_SSI_SRCR, &srcr); 816 stcr &= ~mask; 817 srcr &= ~mask; 818 819 ssi_private->i2s_mode = CCSR_SSI_SCR_NET; 820 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 821 case SND_SOC_DAIFMT_I2S: 822 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 823 case SND_SOC_DAIFMT_CBM_CFS: 824 case SND_SOC_DAIFMT_CBS_CFS: 825 ssi_private->i2s_mode |= CCSR_SSI_SCR_I2S_MODE_MASTER; 826 regmap_update_bits(regs, CCSR_SSI_STCCR, 827 CCSR_SSI_SxCCR_DC_MASK, 828 CCSR_SSI_SxCCR_DC(2)); 829 regmap_update_bits(regs, CCSR_SSI_SRCCR, 830 CCSR_SSI_SxCCR_DC_MASK, 831 CCSR_SSI_SxCCR_DC(2)); 832 break; 833 case SND_SOC_DAIFMT_CBM_CFM: 834 ssi_private->i2s_mode |= CCSR_SSI_SCR_I2S_MODE_SLAVE; 835 break; 836 default: 837 return -EINVAL; 838 } 839 840 /* Data on rising edge of bclk, frame low, 1clk before data */ 841 strcr |= CCSR_SSI_STCR_TFSI | CCSR_SSI_STCR_TSCKP | 842 CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TEFS; 843 break; 844 case SND_SOC_DAIFMT_LEFT_J: 845 /* Data on rising edge of bclk, frame high */ 846 strcr |= CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TSCKP; 847 break; 848 case SND_SOC_DAIFMT_DSP_A: 849 /* Data on rising edge of bclk, frame high, 1clk before data */ 850 strcr |= CCSR_SSI_STCR_TFSL | CCSR_SSI_STCR_TSCKP | 851 CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TEFS; 852 break; 853 case SND_SOC_DAIFMT_DSP_B: 854 /* Data on rising edge of bclk, frame high */ 855 strcr |= CCSR_SSI_STCR_TFSL | CCSR_SSI_STCR_TSCKP | 856 CCSR_SSI_STCR_TXBIT0; 857 break; 858 case SND_SOC_DAIFMT_AC97: 859 ssi_private->i2s_mode |= CCSR_SSI_SCR_I2S_MODE_NORMAL; 860 break; 861 default: 862 return -EINVAL; 863 } 864 scr |= ssi_private->i2s_mode; 865 866 /* DAI clock inversion */ 867 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 868 case SND_SOC_DAIFMT_NB_NF: 869 /* Nothing to do for both normal cases */ 870 break; 871 case SND_SOC_DAIFMT_IB_NF: 872 /* Invert bit clock */ 873 strcr ^= CCSR_SSI_STCR_TSCKP; 874 break; 875 case SND_SOC_DAIFMT_NB_IF: 876 /* Invert frame clock */ 877 strcr ^= CCSR_SSI_STCR_TFSI; 878 break; 879 case SND_SOC_DAIFMT_IB_IF: 880 /* Invert both clocks */ 881 strcr ^= CCSR_SSI_STCR_TSCKP; 882 strcr ^= CCSR_SSI_STCR_TFSI; 883 break; 884 default: 885 return -EINVAL; 886 } 887 888 /* DAI clock master masks */ 889 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 890 case SND_SOC_DAIFMT_CBS_CFS: 891 strcr |= CCSR_SSI_STCR_TFDIR | CCSR_SSI_STCR_TXDIR; 892 scr |= CCSR_SSI_SCR_SYS_CLK_EN; 893 break; 894 case SND_SOC_DAIFMT_CBM_CFM: 895 scr &= ~CCSR_SSI_SCR_SYS_CLK_EN; 896 break; 897 case SND_SOC_DAIFMT_CBM_CFS: 898 strcr &= ~CCSR_SSI_STCR_TXDIR; 899 strcr |= CCSR_SSI_STCR_TFDIR; 900 scr &= ~CCSR_SSI_SCR_SYS_CLK_EN; 901 break; 902 default: 903 return -EINVAL; 904 } 905 906 stcr |= strcr; 907 srcr |= strcr; 908 909 if (ssi_private->cpu_dai_drv.symmetric_rates) { 910 /* Need to clear RXDIR when using SYNC mode */ 911 srcr &= ~CCSR_SSI_SRCR_RXDIR; 912 scr |= CCSR_SSI_SCR_SYN; 913 } 914 915 regmap_write(regs, CCSR_SSI_STCR, stcr); 916 regmap_write(regs, CCSR_SSI_SRCR, srcr); 917 regmap_write(regs, CCSR_SSI_SCR, scr); 918 919 /* 920 * Set the watermark for transmit FIFI 0 and receive FIFO 0. We don't 921 * use FIFO 1. We program the transmit water to signal a DMA transfer 922 * if there are only two (or fewer) elements left in the FIFO. Two 923 * elements equals one frame (left channel, right channel). This value, 924 * however, depends on the depth of the transmit buffer. 925 * 926 * We set the watermark on the same level as the DMA burstsize. For 927 * fiq it is probably better to use the biggest possible watermark 928 * size. 929 */ 930 if (ssi_private->use_dma) 931 wm = ssi_private->fifo_depth - 2; 932 else 933 wm = ssi_private->fifo_depth; 934 935 regmap_write(regs, CCSR_SSI_SFCSR, 936 CCSR_SSI_SFCSR_TFWM0(wm) | CCSR_SSI_SFCSR_RFWM0(wm) | 937 CCSR_SSI_SFCSR_TFWM1(wm) | CCSR_SSI_SFCSR_RFWM1(wm)); 938 939 if (ssi_private->use_dual_fifo) { 940 regmap_update_bits(regs, CCSR_SSI_SRCR, CCSR_SSI_SRCR_RFEN1, 941 CCSR_SSI_SRCR_RFEN1); 942 regmap_update_bits(regs, CCSR_SSI_STCR, CCSR_SSI_STCR_TFEN1, 943 CCSR_SSI_STCR_TFEN1); 944 regmap_update_bits(regs, CCSR_SSI_SCR, CCSR_SSI_SCR_TCH_EN, 945 CCSR_SSI_SCR_TCH_EN); 946 } 947 948 if (fmt & SND_SOC_DAIFMT_AC97) 949 fsl_ssi_setup_ac97(ssi_private); 950 951 return 0; 952 953} 954 955/** 956 * fsl_ssi_set_dai_fmt - configure Digital Audio Interface Format. 957 */ 958static int fsl_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) 959{ 960 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai); 961 962 return _fsl_ssi_set_dai_fmt(cpu_dai->dev, ssi_private, fmt); 963} 964 965/** 966 * fsl_ssi_set_dai_tdm_slot - set TDM slot number 967 * 968 * Note: This function can be only called when using SSI as DAI master 969 */ 970static int fsl_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask, 971 u32 rx_mask, int slots, int slot_width) 972{ 973 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai); 974 struct regmap *regs = ssi_private->regs; 975 u32 val; 976 977 /* The slot number should be >= 2 if using Network mode or I2S mode */ 978 regmap_read(regs, CCSR_SSI_SCR, &val); 979 val &= CCSR_SSI_SCR_I2S_MODE_MASK | CCSR_SSI_SCR_NET; 980 if (val && slots < 2) { 981 dev_err(cpu_dai->dev, "slot number should be >= 2 in I2S or NET\n"); 982 return -EINVAL; 983 } 984 985 regmap_update_bits(regs, CCSR_SSI_STCCR, CCSR_SSI_SxCCR_DC_MASK, 986 CCSR_SSI_SxCCR_DC(slots)); 987 regmap_update_bits(regs, CCSR_SSI_SRCCR, CCSR_SSI_SxCCR_DC_MASK, 988 CCSR_SSI_SxCCR_DC(slots)); 989 990 /* The register SxMSKs needs SSI to provide essential clock due to 991 * hardware design. So we here temporarily enable SSI to set them. 992 */ 993 regmap_read(regs, CCSR_SSI_SCR, &val); 994 val &= CCSR_SSI_SCR_SSIEN; 995 regmap_update_bits(regs, CCSR_SSI_SCR, CCSR_SSI_SCR_SSIEN, 996 CCSR_SSI_SCR_SSIEN); 997 998 regmap_write(regs, CCSR_SSI_STMSK, ~tx_mask); 999 regmap_write(regs, CCSR_SSI_SRMSK, ~rx_mask); 1000 1001 regmap_update_bits(regs, CCSR_SSI_SCR, CCSR_SSI_SCR_SSIEN, val); 1002 1003 return 0; 1004} 1005 1006/** 1007 * fsl_ssi_trigger: start and stop the DMA transfer. 1008 * 1009 * This function is called by ALSA to start, stop, pause, and resume the DMA 1010 * transfer of data. 1011 * 1012 * The DMA channel is in external master start and pause mode, which 1013 * means the SSI completely controls the flow of data. 1014 */ 1015static int fsl_ssi_trigger(struct snd_pcm_substream *substream, int cmd, 1016 struct snd_soc_dai *dai) 1017{ 1018 struct snd_soc_pcm_runtime *rtd = substream->private_data; 1019 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(rtd->cpu_dai); 1020 struct regmap *regs = ssi_private->regs; 1021 1022 switch (cmd) { 1023 case SNDRV_PCM_TRIGGER_START: 1024 case SNDRV_PCM_TRIGGER_RESUME: 1025 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 1026 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1027 fsl_ssi_tx_config(ssi_private, true); 1028 else 1029 fsl_ssi_rx_config(ssi_private, true); 1030 break; 1031 1032 case SNDRV_PCM_TRIGGER_STOP: 1033 case SNDRV_PCM_TRIGGER_SUSPEND: 1034 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 1035 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1036 fsl_ssi_tx_config(ssi_private, false); 1037 else 1038 fsl_ssi_rx_config(ssi_private, false); 1039 break; 1040 1041 default: 1042 return -EINVAL; 1043 } 1044 1045 if (fsl_ssi_is_ac97(ssi_private)) { 1046 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 1047 regmap_write(regs, CCSR_SSI_SOR, CCSR_SSI_SOR_TX_CLR); 1048 else 1049 regmap_write(regs, CCSR_SSI_SOR, CCSR_SSI_SOR_RX_CLR); 1050 } 1051 1052 return 0; 1053} 1054 1055static int fsl_ssi_dai_probe(struct snd_soc_dai *dai) 1056{ 1057 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(dai); 1058 1059 if (ssi_private->soc->imx && ssi_private->use_dma) { 1060 dai->playback_dma_data = &ssi_private->dma_params_tx; 1061 dai->capture_dma_data = &ssi_private->dma_params_rx; 1062 } 1063 1064 return 0; 1065} 1066 1067static const struct snd_soc_dai_ops fsl_ssi_dai_ops = { 1068 .startup = fsl_ssi_startup, 1069 .shutdown = fsl_ssi_shutdown, 1070 .hw_params = fsl_ssi_hw_params, 1071 .hw_free = fsl_ssi_hw_free, 1072 .set_fmt = fsl_ssi_set_dai_fmt, 1073 .set_sysclk = fsl_ssi_set_dai_sysclk, 1074 .set_tdm_slot = fsl_ssi_set_dai_tdm_slot, 1075 .trigger = fsl_ssi_trigger, 1076}; 1077 1078/* Template for the CPU dai driver structure */ 1079static struct snd_soc_dai_driver fsl_ssi_dai_template = { 1080 .probe = fsl_ssi_dai_probe, 1081 .playback = { 1082 .stream_name = "CPU-Playback", 1083 .channels_min = 1, 1084 .channels_max = 2, 1085 .rates = FSLSSI_I2S_RATES, 1086 .formats = FSLSSI_I2S_FORMATS, 1087 }, 1088 .capture = { 1089 .stream_name = "CPU-Capture", 1090 .channels_min = 1, 1091 .channels_max = 2, 1092 .rates = FSLSSI_I2S_RATES, 1093 .formats = FSLSSI_I2S_FORMATS, 1094 }, 1095 .ops = &fsl_ssi_dai_ops, 1096}; 1097 1098static const struct snd_soc_component_driver fsl_ssi_component = { 1099 .name = "fsl-ssi", 1100}; 1101 1102static struct snd_soc_dai_driver fsl_ssi_ac97_dai = { 1103 .bus_control = true, 1104 .playback = { 1105 .stream_name = "AC97 Playback", 1106 .channels_min = 2, 1107 .channels_max = 2, 1108 .rates = SNDRV_PCM_RATE_8000_48000, 1109 .formats = SNDRV_PCM_FMTBIT_S16_LE, 1110 }, 1111 .capture = { 1112 .stream_name = "AC97 Capture", 1113 .channels_min = 2, 1114 .channels_max = 2, 1115 .rates = SNDRV_PCM_RATE_48000, 1116 .formats = SNDRV_PCM_FMTBIT_S16_LE, 1117 }, 1118 .ops = &fsl_ssi_dai_ops, 1119}; 1120 1121 1122static struct fsl_ssi_private *fsl_ac97_data; 1123 1124static void fsl_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg, 1125 unsigned short val) 1126{ 1127 struct regmap *regs = fsl_ac97_data->regs; 1128 unsigned int lreg; 1129 unsigned int lval; 1130 1131 if (reg > 0x7f) 1132 return; 1133 1134 1135 lreg = reg << 12; 1136 regmap_write(regs, CCSR_SSI_SACADD, lreg); 1137 1138 lval = val << 4; 1139 regmap_write(regs, CCSR_SSI_SACDAT, lval); 1140 1141 regmap_update_bits(regs, CCSR_SSI_SACNT, CCSR_SSI_SACNT_RDWR_MASK, 1142 CCSR_SSI_SACNT_WR); 1143 udelay(100); 1144} 1145 1146static unsigned short fsl_ssi_ac97_read(struct snd_ac97 *ac97, 1147 unsigned short reg) 1148{ 1149 struct regmap *regs = fsl_ac97_data->regs; 1150 1151 unsigned short val = -1; 1152 u32 reg_val; 1153 unsigned int lreg; 1154 1155 lreg = (reg & 0x7f) << 12; 1156 regmap_write(regs, CCSR_SSI_SACADD, lreg); 1157 regmap_update_bits(regs, CCSR_SSI_SACNT, CCSR_SSI_SACNT_RDWR_MASK, 1158 CCSR_SSI_SACNT_RD); 1159 1160 udelay(100); 1161 1162 regmap_read(regs, CCSR_SSI_SACDAT, ®_val); 1163 val = (reg_val >> 4) & 0xffff; 1164 1165 return val; 1166} 1167 1168static struct snd_ac97_bus_ops fsl_ssi_ac97_ops = { 1169 .read = fsl_ssi_ac97_read, 1170 .write = fsl_ssi_ac97_write, 1171}; 1172 1173/** 1174 * Make every character in a string lower-case 1175 */ 1176static void make_lowercase(char *s) 1177{ 1178 char *p = s; 1179 char c; 1180 1181 while ((c = *p)) { 1182 if ((c >= 'A') && (c <= 'Z')) 1183 *p = c + ('a' - 'A'); 1184 p++; 1185 } 1186} 1187 1188static int fsl_ssi_imx_probe(struct platform_device *pdev, 1189 struct fsl_ssi_private *ssi_private, void __iomem *iomem) 1190{ 1191 struct device_node *np = pdev->dev.of_node; 1192 u32 dmas[4]; 1193 int ret; 1194 1195 if (ssi_private->has_ipg_clk_name) 1196 ssi_private->clk = devm_clk_get(&pdev->dev, "ipg"); 1197 else 1198 ssi_private->clk = devm_clk_get(&pdev->dev, NULL); 1199 if (IS_ERR(ssi_private->clk)) { 1200 ret = PTR_ERR(ssi_private->clk); 1201 dev_err(&pdev->dev, "could not get clock: %d\n", ret); 1202 return ret; 1203 } 1204 1205 if (!ssi_private->has_ipg_clk_name) { 1206 ret = clk_prepare_enable(ssi_private->clk); 1207 if (ret) { 1208 dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret); 1209 return ret; 1210 } 1211 } 1212 1213 /* For those SLAVE implementations, we ingore non-baudclk cases 1214 * and, instead, abandon MASTER mode that needs baud clock. 1215 */ 1216 ssi_private->baudclk = devm_clk_get(&pdev->dev, "baud"); 1217 if (IS_ERR(ssi_private->baudclk)) 1218 dev_dbg(&pdev->dev, "could not get baud clock: %ld\n", 1219 PTR_ERR(ssi_private->baudclk)); 1220 1221 /* 1222 * We have burstsize be "fifo_depth - 2" to match the SSI 1223 * watermark setting in fsl_ssi_startup(). 1224 */ 1225 ssi_private->dma_params_tx.maxburst = ssi_private->fifo_depth - 2; 1226 ssi_private->dma_params_rx.maxburst = ssi_private->fifo_depth - 2; 1227 ssi_private->dma_params_tx.addr = ssi_private->ssi_phys + CCSR_SSI_STX0; 1228 ssi_private->dma_params_rx.addr = ssi_private->ssi_phys + CCSR_SSI_SRX0; 1229 1230 ret = of_property_read_u32_array(np, "dmas", dmas, 4); 1231 if (ssi_private->use_dma && !ret && dmas[2] == IMX_DMATYPE_SSI_DUAL) { 1232 ssi_private->use_dual_fifo = true; 1233 /* When using dual fifo mode, we need to keep watermark 1234 * as even numbers due to dma script limitation. 1235 */ 1236 ssi_private->dma_params_tx.maxburst &= ~0x1; 1237 ssi_private->dma_params_rx.maxburst &= ~0x1; 1238 } 1239 1240 if (!ssi_private->use_dma) { 1241 1242 /* 1243 * Some boards use an incompatible codec. To get it 1244 * working, we are using imx-fiq-pcm-audio, that 1245 * can handle those codecs. DMA is not possible in this 1246 * situation. 1247 */ 1248 1249 ssi_private->fiq_params.irq = ssi_private->irq; 1250 ssi_private->fiq_params.base = iomem; 1251 ssi_private->fiq_params.dma_params_rx = 1252 &ssi_private->dma_params_rx; 1253 ssi_private->fiq_params.dma_params_tx = 1254 &ssi_private->dma_params_tx; 1255 1256 ret = imx_pcm_fiq_init(pdev, &ssi_private->fiq_params); 1257 if (ret) 1258 goto error_pcm; 1259 } else { 1260 ret = imx_pcm_dma_init(pdev); 1261 if (ret) 1262 goto error_pcm; 1263 } 1264 1265 return 0; 1266 1267error_pcm: 1268 1269 if (!ssi_private->has_ipg_clk_name) 1270 clk_disable_unprepare(ssi_private->clk); 1271 return ret; 1272} 1273 1274static void fsl_ssi_imx_clean(struct platform_device *pdev, 1275 struct fsl_ssi_private *ssi_private) 1276{ 1277 if (!ssi_private->use_dma) 1278 imx_pcm_fiq_exit(pdev); 1279 if (!ssi_private->has_ipg_clk_name) 1280 clk_disable_unprepare(ssi_private->clk); 1281} 1282 1283static int fsl_ssi_probe(struct platform_device *pdev) 1284{ 1285 struct fsl_ssi_private *ssi_private; 1286 int ret = 0; 1287 struct device_node *np = pdev->dev.of_node; 1288 const struct of_device_id *of_id; 1289 const char *p, *sprop; 1290 const uint32_t *iprop; 1291 struct resource *res; 1292 void __iomem *iomem; 1293 char name[64]; 1294 1295 /* SSIs that are not connected on the board should have a 1296 * status = "disabled" 1297 * property in their device tree nodes. 1298 */ 1299 if (!of_device_is_available(np)) 1300 return -ENODEV; 1301 1302 of_id = of_match_device(fsl_ssi_ids, &pdev->dev); 1303 if (!of_id || !of_id->data) 1304 return -EINVAL; 1305 1306 ssi_private = devm_kzalloc(&pdev->dev, sizeof(*ssi_private), 1307 GFP_KERNEL); 1308 if (!ssi_private) { 1309 dev_err(&pdev->dev, "could not allocate DAI object\n"); 1310 return -ENOMEM; 1311 } 1312 1313 ssi_private->soc = of_id->data; 1314 1315 sprop = of_get_property(np, "fsl,mode", NULL); 1316 if (sprop) { 1317 if (!strcmp(sprop, "ac97-slave")) 1318 ssi_private->dai_fmt = SND_SOC_DAIFMT_AC97; 1319 } 1320 1321 ssi_private->use_dma = !of_property_read_bool(np, 1322 "fsl,fiq-stream-filter"); 1323 1324 if (fsl_ssi_is_ac97(ssi_private)) { 1325 memcpy(&ssi_private->cpu_dai_drv, &fsl_ssi_ac97_dai, 1326 sizeof(fsl_ssi_ac97_dai)); 1327 1328 fsl_ac97_data = ssi_private; 1329 1330 snd_soc_set_ac97_ops_of_reset(&fsl_ssi_ac97_ops, pdev); 1331 } else { 1332 /* Initialize this copy of the CPU DAI driver structure */ 1333 memcpy(&ssi_private->cpu_dai_drv, &fsl_ssi_dai_template, 1334 sizeof(fsl_ssi_dai_template)); 1335 } 1336 ssi_private->cpu_dai_drv.name = dev_name(&pdev->dev); 1337 1338 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1339 iomem = devm_ioremap_resource(&pdev->dev, res); 1340 if (IS_ERR(iomem)) 1341 return PTR_ERR(iomem); 1342 ssi_private->ssi_phys = res->start; 1343 1344 ret = of_property_match_string(np, "clock-names", "ipg"); 1345 if (ret < 0) { 1346 ssi_private->has_ipg_clk_name = false; 1347 ssi_private->regs = devm_regmap_init_mmio(&pdev->dev, iomem, 1348 &fsl_ssi_regconfig); 1349 } else { 1350 ssi_private->has_ipg_clk_name = true; 1351 ssi_private->regs = devm_regmap_init_mmio_clk(&pdev->dev, 1352 "ipg", iomem, &fsl_ssi_regconfig); 1353 } 1354 if (IS_ERR(ssi_private->regs)) { 1355 dev_err(&pdev->dev, "Failed to init register map\n"); 1356 return PTR_ERR(ssi_private->regs); 1357 } 1358 1359 ssi_private->irq = platform_get_irq(pdev, 0); 1360 if (ssi_private->irq < 0) { 1361 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name); 1362 return ssi_private->irq; 1363 } 1364 1365 /* Are the RX and the TX clocks locked? */ 1366 if (!of_find_property(np, "fsl,ssi-asynchronous", NULL)) { 1367 ssi_private->cpu_dai_drv.symmetric_rates = 1; 1368 ssi_private->cpu_dai_drv.symmetric_channels = 1; 1369 ssi_private->cpu_dai_drv.symmetric_samplebits = 1; 1370 } 1371 1372 /* Determine the FIFO depth. */ 1373 iprop = of_get_property(np, "fsl,fifo-depth", NULL); 1374 if (iprop) 1375 ssi_private->fifo_depth = be32_to_cpup(iprop); 1376 else 1377 /* Older 8610 DTs didn't have the fifo-depth property */ 1378 ssi_private->fifo_depth = 8; 1379 1380 dev_set_drvdata(&pdev->dev, ssi_private); 1381 1382 if (ssi_private->soc->imx) { 1383 ret = fsl_ssi_imx_probe(pdev, ssi_private, iomem); 1384 if (ret) 1385 return ret; 1386 } 1387 1388 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_ssi_component, 1389 &ssi_private->cpu_dai_drv, 1); 1390 if (ret) { 1391 dev_err(&pdev->dev, "failed to register DAI: %d\n", ret); 1392 goto error_asoc_register; 1393 } 1394 1395 if (ssi_private->use_dma) { 1396 ret = devm_request_irq(&pdev->dev, ssi_private->irq, 1397 fsl_ssi_isr, 0, dev_name(&pdev->dev), 1398 ssi_private); 1399 if (ret < 0) { 1400 dev_err(&pdev->dev, "could not claim irq %u\n", 1401 ssi_private->irq); 1402 goto error_asoc_register; 1403 } 1404 } 1405 1406 ret = fsl_ssi_debugfs_create(&ssi_private->dbg_stats, &pdev->dev); 1407 if (ret) 1408 goto error_asoc_register; 1409 1410 /* 1411 * If codec-handle property is missing from SSI node, we assume 1412 * that the machine driver uses new binding which does not require 1413 * SSI driver to trigger machine driver's probe. 1414 */ 1415 if (!of_get_property(np, "codec-handle", NULL)) 1416 goto done; 1417 1418 /* Trigger the machine driver's probe function. The platform driver 1419 * name of the machine driver is taken from /compatible property of the 1420 * device tree. We also pass the address of the CPU DAI driver 1421 * structure. 1422 */ 1423 sprop = of_get_property(of_find_node_by_path("/"), "compatible", NULL); 1424 /* Sometimes the compatible name has a "fsl," prefix, so we strip it. */ 1425 p = strrchr(sprop, ','); 1426 if (p) 1427 sprop = p + 1; 1428 snprintf(name, sizeof(name), "snd-soc-%s", sprop); 1429 make_lowercase(name); 1430 1431 ssi_private->pdev = 1432 platform_device_register_data(&pdev->dev, name, 0, NULL, 0); 1433 if (IS_ERR(ssi_private->pdev)) { 1434 ret = PTR_ERR(ssi_private->pdev); 1435 dev_err(&pdev->dev, "failed to register platform: %d\n", ret); 1436 goto error_sound_card; 1437 } 1438 1439done: 1440 if (ssi_private->dai_fmt) 1441 _fsl_ssi_set_dai_fmt(&pdev->dev, ssi_private, 1442 ssi_private->dai_fmt); 1443 1444 return 0; 1445 1446error_sound_card: 1447 fsl_ssi_debugfs_remove(&ssi_private->dbg_stats); 1448 1449error_asoc_register: 1450 if (ssi_private->soc->imx) 1451 fsl_ssi_imx_clean(pdev, ssi_private); 1452 1453 return ret; 1454} 1455 1456static int fsl_ssi_remove(struct platform_device *pdev) 1457{ 1458 struct fsl_ssi_private *ssi_private = dev_get_drvdata(&pdev->dev); 1459 1460 fsl_ssi_debugfs_remove(&ssi_private->dbg_stats); 1461 1462 if (ssi_private->pdev) 1463 platform_device_unregister(ssi_private->pdev); 1464 1465 if (ssi_private->soc->imx) 1466 fsl_ssi_imx_clean(pdev, ssi_private); 1467 1468 return 0; 1469} 1470 1471static struct platform_driver fsl_ssi_driver = { 1472 .driver = { 1473 .name = "fsl-ssi-dai", 1474 .of_match_table = fsl_ssi_ids, 1475 }, 1476 .probe = fsl_ssi_probe, 1477 .remove = fsl_ssi_remove, 1478}; 1479 1480module_platform_driver(fsl_ssi_driver); 1481 1482MODULE_ALIAS("platform:fsl-ssi-dai"); 1483MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); 1484MODULE_DESCRIPTION("Freescale Synchronous Serial Interface (SSI) ASoC Driver"); 1485MODULE_LICENSE("GPL v2"); 1486