2 * Freescale SSI ALSA SoC Digital Audio Interface (DAI) driver
4 * Author: Timur Tabi <timur@freescale.com>
6 * Copyright 2007-2010 Freescale Semiconductor, Inc.
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.
13 * Some notes why imx-pcm-fiq is used instead of DMA on some boards:
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
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.
33 #include <linux/init.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>
43 #include <linux/of_address.h>
44 #include <linux/of_irq.h>
45 #include <linux/of_platform.h>
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>
58 * FSLSSI_I2S_RATES: sample rates supported by the I2S
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.
65 #define FSLSSI_I2S_RATES SNDRV_PCM_RATE_CONTINUOUS
68 * FSLSSI_I2S_FORMATS: audio formats supported by the SSI
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.
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)
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)
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)
103 struct fsl_ssi_reg_val {
110 struct fsl_ssi_rxtx_reg_val {
111 struct fsl_ssi_reg_val rx;
112 struct fsl_ssi_reg_val tx;
115 static bool fsl_ssi_readable_reg(struct device *dev, unsigned int reg)
118 case CCSR_SSI_SACCEN:
119 case CCSR_SSI_SACCDIS:
126 static bool fsl_ssi_volatile_reg(struct device *dev, unsigned int reg)
136 case CCSR_SSI_SACADD:
137 case CCSR_SSI_SACDAT:
139 case CCSR_SSI_SACCST:
147 static bool fsl_ssi_precious_reg(struct device *dev, unsigned int reg)
153 case CCSR_SSI_SACADD:
154 case CCSR_SSI_SACDAT:
162 static bool fsl_ssi_writeable_reg(struct device *dev, unsigned int reg)
167 case CCSR_SSI_SACCST:
174 static const struct regmap_config fsl_ssi_regconfig = {
175 .max_register = CCSR_SSI_SACCDIS,
179 .val_format_endian = REGMAP_ENDIAN_NATIVE,
180 .readable_reg = fsl_ssi_readable_reg,
181 .volatile_reg = fsl_ssi_volatile_reg,
182 .precious_reg = fsl_ssi_precious_reg,
183 .writeable_reg = fsl_ssi_writeable_reg,
184 .cache_type = REGCACHE_FLAT,
187 struct fsl_ssi_soc_data {
189 bool imx21regs; /* imx21-class SSI - no SACC{ST,EN,DIS} regs */
195 * fsl_ssi_private: per-SSI private data
197 * @reg: Pointer to the regmap registers
198 * @irq: IRQ of this SSI
199 * @cpu_dai_drv: CPU DAI driver for this device
201 * @dai_fmt: DAI configuration this device is currently used with
202 * @i2s_mode: i2s and network mode configuration of the device. Is used to
203 * switch between normal and i2s/network mode
204 * mode depending on the number of channels
205 * @use_dma: DMA is used or FIQ with stream filter
206 * @use_dual_fifo: DMA with support for both FIFOs used
207 * @fifo_deph: Depth of the SSI FIFOs
208 * @rxtx_reg_val: Specific register settings for receive/transmit configuration
211 * @baudclk: SSI baud clock for master mode
212 * @baudclk_streams: Active streams that are using baudclk
213 * @bitclk_freq: bitclock frequency set by .set_dai_sysclk
215 * @dma_params_tx: DMA transmit parameters
216 * @dma_params_rx: DMA receive parameters
217 * @ssi_phys: physical address of the SSI registers
219 * @fiq_params: FIQ stream filtering parameters
221 * @pdev: Pointer to pdev used for deprecated fsl-ssi sound card
223 * @dbg_stats: Debugging statistics
225 * @soc: SoC specific data
227 struct fsl_ssi_private {
230 struct snd_soc_dai_driver cpu_dai_drv;
232 unsigned int dai_fmt;
236 bool has_ipg_clk_name;
237 unsigned int fifo_depth;
238 struct fsl_ssi_rxtx_reg_val rxtx_reg_val;
242 unsigned int baudclk_streams;
243 unsigned int bitclk_freq;
245 /* regcache for volatile regs */
250 struct snd_dmaengine_dai_dma_data dma_params_tx;
251 struct snd_dmaengine_dai_dma_data dma_params_rx;
254 /* params for non-dma FIQ stream filtered mode */
255 struct imx_pcm_fiq_params fiq_params;
257 /* Used when using fsl-ssi as sound-card. This is only used by ppc and
258 * should be replaced with simple-sound-card. */
259 struct platform_device *pdev;
261 struct fsl_ssi_dbg dbg_stats;
263 const struct fsl_ssi_soc_data *soc;
268 * imx51 and later SoCs have a slightly different IP that allows the
269 * SSI configuration while the SSI unit is running.
271 * More important, it is necessary on those SoCs to configure the
272 * sperate TX/RX DMA bits just before starting the stream
273 * (fsl_ssi_trigger). The SDMA unit has to be configured before fsl_ssi
274 * sends any DMA requests to the SDMA unit, otherwise it is not defined
275 * how the SDMA unit handles the DMA request.
277 * SDMA units are present on devices starting at imx35 but the imx35
278 * reference manual states that the DMA bits should not be changed
279 * while the SSI unit is running (SSIEN). So we support the necessary
280 * online configuration of fsl-ssi starting at imx51.
283 static struct fsl_ssi_soc_data fsl_ssi_mpc8610 = {
285 .offline_config = true,
286 .sisr_write_mask = CCSR_SSI_SISR_RFRC | CCSR_SSI_SISR_TFRC |
287 CCSR_SSI_SISR_ROE0 | CCSR_SSI_SISR_ROE1 |
288 CCSR_SSI_SISR_TUE0 | CCSR_SSI_SISR_TUE1,
291 static struct fsl_ssi_soc_data fsl_ssi_imx21 = {
294 .offline_config = true,
295 .sisr_write_mask = 0,
298 static struct fsl_ssi_soc_data fsl_ssi_imx35 = {
300 .offline_config = true,
301 .sisr_write_mask = CCSR_SSI_SISR_RFRC | CCSR_SSI_SISR_TFRC |
302 CCSR_SSI_SISR_ROE0 | CCSR_SSI_SISR_ROE1 |
303 CCSR_SSI_SISR_TUE0 | CCSR_SSI_SISR_TUE1,
306 static struct fsl_ssi_soc_data fsl_ssi_imx51 = {
308 .offline_config = false,
309 .sisr_write_mask = CCSR_SSI_SISR_ROE0 | CCSR_SSI_SISR_ROE1 |
310 CCSR_SSI_SISR_TUE0 | CCSR_SSI_SISR_TUE1,
313 static const struct of_device_id fsl_ssi_ids[] = {
314 { .compatible = "fsl,mpc8610-ssi", .data = &fsl_ssi_mpc8610 },
315 { .compatible = "fsl,imx51-ssi", .data = &fsl_ssi_imx51 },
316 { .compatible = "fsl,imx35-ssi", .data = &fsl_ssi_imx35 },
317 { .compatible = "fsl,imx21-ssi", .data = &fsl_ssi_imx21 },
320 MODULE_DEVICE_TABLE(of, fsl_ssi_ids);
322 static bool fsl_ssi_is_ac97(struct fsl_ssi_private *ssi_private)
324 return (ssi_private->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) ==
328 static bool fsl_ssi_is_i2s_master(struct fsl_ssi_private *ssi_private)
330 return (ssi_private->dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) ==
331 SND_SOC_DAIFMT_CBS_CFS;
334 static bool fsl_ssi_is_i2s_cbm_cfs(struct fsl_ssi_private *ssi_private)
336 return (ssi_private->dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) ==
337 SND_SOC_DAIFMT_CBM_CFS;
340 * fsl_ssi_isr: SSI interrupt handler
342 * Although it's possible to use the interrupt handler to send and receive
343 * data to/from the SSI, we use the DMA instead. Programming is more
344 * complicated, but the performance is much better.
346 * This interrupt handler is used only to gather statistics.
348 * @irq: IRQ of the SSI device
349 * @dev_id: pointer to the ssi_private structure for this SSI device
351 static irqreturn_t fsl_ssi_isr(int irq, void *dev_id)
353 struct fsl_ssi_private *ssi_private = dev_id;
354 struct regmap *regs = ssi_private->regs;
358 /* We got an interrupt, so read the status register to see what we
359 were interrupted for. We mask it with the Interrupt Enable register
360 so that we only check for events that we're interested in.
362 regmap_read(regs, CCSR_SSI_SISR, &sisr);
364 sisr2 = sisr & ssi_private->soc->sisr_write_mask;
365 /* Clear the bits that we set */
367 regmap_write(regs, CCSR_SSI_SISR, sisr2);
369 fsl_ssi_dbg_isr(&ssi_private->dbg_stats, sisr);
375 * Enable/Disable all rx/tx config flags at once.
377 static void fsl_ssi_rxtx_config(struct fsl_ssi_private *ssi_private,
380 struct regmap *regs = ssi_private->regs;
381 struct fsl_ssi_rxtx_reg_val *vals = &ssi_private->rxtx_reg_val;
384 regmap_update_bits(regs, CCSR_SSI_SIER,
385 vals->rx.sier | vals->tx.sier,
386 vals->rx.sier | vals->tx.sier);
387 regmap_update_bits(regs, CCSR_SSI_SRCR,
388 vals->rx.srcr | vals->tx.srcr,
389 vals->rx.srcr | vals->tx.srcr);
390 regmap_update_bits(regs, CCSR_SSI_STCR,
391 vals->rx.stcr | vals->tx.stcr,
392 vals->rx.stcr | vals->tx.stcr);
394 regmap_update_bits(regs, CCSR_SSI_SRCR,
395 vals->rx.srcr | vals->tx.srcr, 0);
396 regmap_update_bits(regs, CCSR_SSI_STCR,
397 vals->rx.stcr | vals->tx.stcr, 0);
398 regmap_update_bits(regs, CCSR_SSI_SIER,
399 vals->rx.sier | vals->tx.sier, 0);
404 * Clear RX or TX FIFO to remove samples from the previous
405 * stream session which may be still present in the FIFO and
406 * may introduce bad samples and/or channel slipping.
408 * Note: The SOR is not documented in recent IMX datasheet, but
409 * is described in IMX51 reference manual at section 56.3.3.15.
411 static void fsl_ssi_fifo_clear(struct fsl_ssi_private *ssi_private,
415 regmap_update_bits(ssi_private->regs, CCSR_SSI_SOR,
416 CCSR_SSI_SOR_RX_CLR, CCSR_SSI_SOR_RX_CLR);
418 regmap_update_bits(ssi_private->regs, CCSR_SSI_SOR,
419 CCSR_SSI_SOR_TX_CLR, CCSR_SSI_SOR_TX_CLR);
424 * Calculate the bits that have to be disabled for the current stream that is
425 * getting disabled. This keeps the bits enabled that are necessary for the
426 * second stream to work if 'stream_active' is true.
428 * Detailed calculation:
429 * These are the values that need to be active after disabling. For non-active
430 * second stream, this is 0:
431 * vals_stream * !!stream_active
433 * The following computes the overall differences between the setup for the
434 * to-disable stream and the active stream, a simple XOR:
435 * vals_disable ^ (vals_stream * !!(stream_active))
437 * The full expression adds a mask on all values we care about
439 #define fsl_ssi_disable_val(vals_disable, vals_stream, stream_active) \
441 ((vals_disable) ^ ((vals_stream) * (u32)!!(stream_active))))
444 * Enable/Disable a ssi configuration. You have to pass either
445 * ssi_private->rxtx_reg_val.rx or tx as vals parameter.
447 static void fsl_ssi_config(struct fsl_ssi_private *ssi_private, bool enable,
448 struct fsl_ssi_reg_val *vals)
450 struct regmap *regs = ssi_private->regs;
451 struct fsl_ssi_reg_val *avals;
452 int nr_active_streams;
456 regmap_read(regs, CCSR_SSI_SCR, &scr_val);
458 nr_active_streams = !!(scr_val & CCSR_SSI_SCR_TE) +
459 !!(scr_val & CCSR_SSI_SCR_RE);
461 if (nr_active_streams - 1 > 0)
466 /* Find the other direction values rx or tx which we do not want to
468 if (&ssi_private->rxtx_reg_val.rx == vals)
469 avals = &ssi_private->rxtx_reg_val.tx;
471 avals = &ssi_private->rxtx_reg_val.rx;
473 /* If vals should be disabled, start with disabling the unit */
475 u32 scr = fsl_ssi_disable_val(vals->scr, avals->scr,
477 regmap_update_bits(regs, CCSR_SSI_SCR, scr, 0);
481 * We are running on a SoC which does not support online SSI
482 * reconfiguration, so we have to enable all necessary flags at once
483 * even if we do not use them later (capture and playback configuration)
485 if (ssi_private->soc->offline_config) {
486 if ((enable && !nr_active_streams) ||
487 (!enable && !keep_active))
488 fsl_ssi_rxtx_config(ssi_private, enable);
494 * Configure single direction units while the SSI unit is running
495 * (online configuration)
498 fsl_ssi_fifo_clear(ssi_private, vals->scr & CCSR_SSI_SCR_RE);
500 regmap_update_bits(regs, CCSR_SSI_SRCR, vals->srcr, vals->srcr);
501 regmap_update_bits(regs, CCSR_SSI_STCR, vals->stcr, vals->stcr);
502 regmap_update_bits(regs, CCSR_SSI_SIER, vals->sier, vals->sier);
509 * Disabling the necessary flags for one of rx/tx while the
510 * other stream is active is a little bit more difficult. We
511 * have to disable only those flags that differ between both
512 * streams (rx XOR tx) and that are set in the stream that is
513 * disabled now. Otherwise we could alter flags of the other
517 /* These assignments are simply vals without bits set in avals*/
518 sier = fsl_ssi_disable_val(vals->sier, avals->sier,
520 srcr = fsl_ssi_disable_val(vals->srcr, avals->srcr,
522 stcr = fsl_ssi_disable_val(vals->stcr, avals->stcr,
525 regmap_update_bits(regs, CCSR_SSI_SRCR, srcr, 0);
526 regmap_update_bits(regs, CCSR_SSI_STCR, stcr, 0);
527 regmap_update_bits(regs, CCSR_SSI_SIER, sier, 0);
531 /* Enabling of subunits is done after configuration */
533 if (ssi_private->use_dma && (vals->scr & CCSR_SSI_SCR_TE)) {
535 * Be sure the Tx FIFO is filled when TE is set.
536 * Otherwise, there are some chances to start the
537 * playback with some void samples inserted first,
538 * generating a channel slip.
540 * First, SSIEN must be set, to let the FIFO be filled.
543 * - Limit this fix to the DMA case until FIQ cases can
545 * - Limit the length of the busy loop to not lock the
546 * system too long, even if 1-2 loops are sufficient
551 regmap_update_bits(regs, CCSR_SSI_SCR,
552 CCSR_SSI_SCR_SSIEN, CCSR_SSI_SCR_SSIEN);
553 for (i = 0; i < max_loop; i++) {
555 regmap_read(regs, CCSR_SSI_SFCSR, &sfcsr);
556 if (CCSR_SSI_SFCSR_TFCNT0(sfcsr))
560 dev_err(ssi_private->dev,
561 "Timeout waiting TX FIFO filling\n");
564 regmap_update_bits(regs, CCSR_SSI_SCR, vals->scr, vals->scr);
569 static void fsl_ssi_rx_config(struct fsl_ssi_private *ssi_private, bool enable)
571 fsl_ssi_config(ssi_private, enable, &ssi_private->rxtx_reg_val.rx);
574 static void fsl_ssi_tx_config(struct fsl_ssi_private *ssi_private, bool enable)
576 fsl_ssi_config(ssi_private, enable, &ssi_private->rxtx_reg_val.tx);
580 * Setup rx/tx register values used to enable/disable the streams. These will
581 * be used later in fsl_ssi_config to setup the streams without the need to
582 * check for all different SSI modes.
584 static void fsl_ssi_setup_reg_vals(struct fsl_ssi_private *ssi_private)
586 struct fsl_ssi_rxtx_reg_val *reg = &ssi_private->rxtx_reg_val;
588 reg->rx.sier = CCSR_SSI_SIER_RFF0_EN;
589 reg->rx.srcr = CCSR_SSI_SRCR_RFEN0;
591 reg->tx.sier = CCSR_SSI_SIER_TFE0_EN;
592 reg->tx.stcr = CCSR_SSI_STCR_TFEN0;
595 if (!fsl_ssi_is_ac97(ssi_private)) {
596 reg->rx.scr = CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_RE;
597 reg->rx.sier |= CCSR_SSI_SIER_RFF0_EN;
598 reg->tx.scr = CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE;
599 reg->tx.sier |= CCSR_SSI_SIER_TFE0_EN;
602 if (ssi_private->use_dma) {
603 reg->rx.sier |= CCSR_SSI_SIER_RDMAE;
604 reg->tx.sier |= CCSR_SSI_SIER_TDMAE;
606 reg->rx.sier |= CCSR_SSI_SIER_RIE;
607 reg->tx.sier |= CCSR_SSI_SIER_TIE;
610 reg->rx.sier |= FSLSSI_SIER_DBG_RX_FLAGS;
611 reg->tx.sier |= FSLSSI_SIER_DBG_TX_FLAGS;
614 static void fsl_ssi_setup_ac97(struct fsl_ssi_private *ssi_private)
616 struct regmap *regs = ssi_private->regs;
619 * Setup the clock control register
621 regmap_write(regs, CCSR_SSI_STCCR,
622 CCSR_SSI_SxCCR_WL(17) | CCSR_SSI_SxCCR_DC(13));
623 regmap_write(regs, CCSR_SSI_SRCCR,
624 CCSR_SSI_SxCCR_WL(17) | CCSR_SSI_SxCCR_DC(13));
627 * Enable AC97 mode and startup the SSI
629 regmap_write(regs, CCSR_SSI_SACNT,
630 CCSR_SSI_SACNT_AC97EN | CCSR_SSI_SACNT_FV);
632 /* no SACC{ST,EN,DIS} regs on imx21-class SSI */
633 if (!ssi_private->soc->imx21regs) {
634 regmap_write(regs, CCSR_SSI_SACCDIS, 0xff);
635 regmap_write(regs, CCSR_SSI_SACCEN, 0x300);
639 * Enable SSI, Transmit and Receive. AC97 has to communicate with the
640 * codec before a stream is started.
642 regmap_update_bits(regs, CCSR_SSI_SCR,
643 CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE | CCSR_SSI_SCR_RE,
644 CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE | CCSR_SSI_SCR_RE);
646 regmap_write(regs, CCSR_SSI_SOR, CCSR_SSI_SOR_WAIT(3));
650 * fsl_ssi_startup: create a new substream
652 * This is the first function called when a stream is opened.
654 * If this is the first stream open, then grab the IRQ and program most of
657 static int fsl_ssi_startup(struct snd_pcm_substream *substream,
658 struct snd_soc_dai *dai)
660 struct snd_soc_pcm_runtime *rtd = substream->private_data;
661 struct fsl_ssi_private *ssi_private =
662 snd_soc_dai_get_drvdata(rtd->cpu_dai);
665 ret = clk_prepare_enable(ssi_private->clk);
669 /* When using dual fifo mode, it is safer to ensure an even period
670 * size. If appearing to an odd number while DMA always starts its
671 * task from fifo0, fifo1 would be neglected at the end of each
672 * period. But SSI would still access fifo1 with an invalid data.
674 if (ssi_private->use_dual_fifo)
675 snd_pcm_hw_constraint_step(substream->runtime, 0,
676 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2);
682 * fsl_ssi_shutdown: shutdown the SSI
685 static void fsl_ssi_shutdown(struct snd_pcm_substream *substream,
686 struct snd_soc_dai *dai)
688 struct snd_soc_pcm_runtime *rtd = substream->private_data;
689 struct fsl_ssi_private *ssi_private =
690 snd_soc_dai_get_drvdata(rtd->cpu_dai);
692 clk_disable_unprepare(ssi_private->clk);
697 * fsl_ssi_set_bclk - configure Digital Audio Interface bit clock
699 * Note: This function can be only called when using SSI as DAI master
701 * Quick instruction for parameters:
702 * freq: Output BCLK frequency = samplerate * 32 (fixed) * channels
703 * dir: SND_SOC_CLOCK_OUT -> TxBCLK, SND_SOC_CLOCK_IN -> RxBCLK.
705 static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream,
706 struct snd_soc_dai *cpu_dai,
707 struct snd_pcm_hw_params *hw_params)
709 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai);
710 struct regmap *regs = ssi_private->regs;
711 int synchronous = ssi_private->cpu_dai_drv.symmetric_rates, ret;
712 u32 pm = 999, div2, psr, stccr, mask, afreq, factor, i;
713 unsigned long clkrate, baudrate, tmprate;
714 u64 sub, savesub = 100000;
716 bool baudclk_is_used;
718 /* Prefer the explicitly set bitclock frequency */
719 if (ssi_private->bitclk_freq)
720 freq = ssi_private->bitclk_freq;
722 freq = params_channels(hw_params) * 32 * params_rate(hw_params);
724 /* Don't apply it to any non-baudclk circumstance */
725 if (IS_ERR(ssi_private->baudclk))
729 * Hardware limitation: The bclk rate must be
730 * never greater than 1/5 IPG clock rate
732 if (freq * 5 > clk_get_rate(ssi_private->clk)) {
733 dev_err(cpu_dai->dev, "bitclk > ipgclk/5\n");
737 baudclk_is_used = ssi_private->baudclk_streams & ~(BIT(substream->stream));
739 /* It should be already enough to divide clock by setting pm alone */
743 factor = (div2 + 1) * (7 * psr + 1) * 2;
745 for (i = 0; i < 255; i++) {
746 tmprate = freq * factor * (i + 1);
749 clkrate = clk_get_rate(ssi_private->baudclk);
751 clkrate = clk_round_rate(ssi_private->baudclk, tmprate);
754 afreq = clkrate / (i + 1);
758 else if (freq / afreq == 1)
760 else if (afreq / freq == 1)
765 /* Calculate the fraction */
769 if (sub < savesub && !(i == 0 && psr == 0 && div2 == 0)) {
780 /* No proper pm found if it is still remaining the initial value */
782 dev_err(cpu_dai->dev, "failed to handle the required sysclk\n");
786 stccr = CCSR_SSI_SxCCR_PM(pm + 1) | (div2 ? CCSR_SSI_SxCCR_DIV2 : 0) |
787 (psr ? CCSR_SSI_SxCCR_PSR : 0);
788 mask = CCSR_SSI_SxCCR_PM_MASK | CCSR_SSI_SxCCR_DIV2 |
791 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK || synchronous)
792 regmap_update_bits(regs, CCSR_SSI_STCCR, mask, stccr);
794 regmap_update_bits(regs, CCSR_SSI_SRCCR, mask, stccr);
796 if (!baudclk_is_used) {
797 ret = clk_set_rate(ssi_private->baudclk, baudrate);
799 dev_err(cpu_dai->dev, "failed to set baudclk rate\n");
807 static int fsl_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
808 int clk_id, unsigned int freq, int dir)
810 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai);
812 ssi_private->bitclk_freq = freq;
818 * fsl_ssi_hw_params - program the sample size
820 * Most of the SSI registers have been programmed in the startup function,
821 * but the word length must be programmed here. Unfortunately, programming
822 * the SxCCR.WL bits requires the SSI to be temporarily disabled. This can
823 * cause a problem with supporting simultaneous playback and capture. If
824 * the SSI is already playing a stream, then that stream may be temporarily
825 * stopped when you start capture.
827 * Note: The SxCCR.DC and SxCCR.PM bits are only used if the SSI is the
830 static int fsl_ssi_hw_params(struct snd_pcm_substream *substream,
831 struct snd_pcm_hw_params *hw_params, struct snd_soc_dai *cpu_dai)
833 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai);
834 struct regmap *regs = ssi_private->regs;
835 unsigned int channels = params_channels(hw_params);
836 unsigned int sample_size = params_width(hw_params);
837 u32 wl = CCSR_SSI_SxCCR_WL(sample_size);
842 regmap_read(regs, CCSR_SSI_SCR, &scr_val);
843 enabled = scr_val & CCSR_SSI_SCR_SSIEN;
846 * If we're in synchronous mode, and the SSI is already enabled,
847 * then STCCR is already set properly.
849 if (enabled && ssi_private->cpu_dai_drv.symmetric_rates)
852 if (fsl_ssi_is_i2s_master(ssi_private)) {
853 ret = fsl_ssi_set_bclk(substream, cpu_dai, hw_params);
857 /* Do not enable the clock if it is already enabled */
858 if (!(ssi_private->baudclk_streams & BIT(substream->stream))) {
859 ret = clk_prepare_enable(ssi_private->baudclk);
863 ssi_private->baudclk_streams |= BIT(substream->stream);
867 if (!fsl_ssi_is_ac97(ssi_private)) {
870 * Switch to normal net mode in order to have a frame sync
871 * signal every 32 bits instead of 16 bits
873 if (fsl_ssi_is_i2s_cbm_cfs(ssi_private) && sample_size == 16)
874 i2smode = CCSR_SSI_SCR_I2S_MODE_NORMAL |
877 i2smode = ssi_private->i2s_mode;
879 regmap_update_bits(regs, CCSR_SSI_SCR,
880 CCSR_SSI_SCR_NET | CCSR_SSI_SCR_I2S_MODE_MASK,
881 channels == 1 ? 0 : i2smode);
885 * FIXME: The documentation says that SxCCR[WL] should not be
886 * modified while the SSI is enabled. The only time this can
887 * happen is if we're trying to do simultaneous playback and
888 * capture in asynchronous mode. Unfortunately, I have been enable
889 * to get that to work at all on the P1022DS. Therefore, we don't
890 * bother to disable/enable the SSI when setting SxCCR[WL], because
891 * the SSI will stop anyway. Maybe one day, this will get fixed.
894 /* In synchronous mode, the SSI uses STCCR for capture */
895 if ((substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ||
896 ssi_private->cpu_dai_drv.symmetric_rates)
897 regmap_update_bits(regs, CCSR_SSI_STCCR, CCSR_SSI_SxCCR_WL_MASK,
900 regmap_update_bits(regs, CCSR_SSI_SRCCR, CCSR_SSI_SxCCR_WL_MASK,
906 static int fsl_ssi_hw_free(struct snd_pcm_substream *substream,
907 struct snd_soc_dai *cpu_dai)
909 struct snd_soc_pcm_runtime *rtd = substream->private_data;
910 struct fsl_ssi_private *ssi_private =
911 snd_soc_dai_get_drvdata(rtd->cpu_dai);
913 if (fsl_ssi_is_i2s_master(ssi_private) &&
914 ssi_private->baudclk_streams & BIT(substream->stream)) {
915 clk_disable_unprepare(ssi_private->baudclk);
916 ssi_private->baudclk_streams &= ~BIT(substream->stream);
922 static int _fsl_ssi_set_dai_fmt(struct device *dev,
923 struct fsl_ssi_private *ssi_private,
926 struct regmap *regs = ssi_private->regs;
927 u32 strcr = 0, stcr, srcr, scr, mask;
930 ssi_private->dai_fmt = fmt;
932 if (fsl_ssi_is_i2s_master(ssi_private) && IS_ERR(ssi_private->baudclk)) {
933 dev_err(dev, "baudclk is missing which is necessary for master mode\n");
937 fsl_ssi_setup_reg_vals(ssi_private);
939 regmap_read(regs, CCSR_SSI_SCR, &scr);
940 scr &= ~(CCSR_SSI_SCR_SYN | CCSR_SSI_SCR_I2S_MODE_MASK);
941 scr |= CCSR_SSI_SCR_SYNC_TX_FS;
943 mask = CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TFDIR | CCSR_SSI_STCR_TXDIR |
944 CCSR_SSI_STCR_TSCKP | CCSR_SSI_STCR_TFSI | CCSR_SSI_STCR_TFSL |
946 regmap_read(regs, CCSR_SSI_STCR, &stcr);
947 regmap_read(regs, CCSR_SSI_SRCR, &srcr);
951 ssi_private->i2s_mode = CCSR_SSI_SCR_NET;
952 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
953 case SND_SOC_DAIFMT_I2S:
954 regmap_update_bits(regs, CCSR_SSI_STCCR,
955 CCSR_SSI_SxCCR_DC_MASK,
956 CCSR_SSI_SxCCR_DC(2));
957 regmap_update_bits(regs, CCSR_SSI_SRCCR,
958 CCSR_SSI_SxCCR_DC_MASK,
959 CCSR_SSI_SxCCR_DC(2));
960 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
961 case SND_SOC_DAIFMT_CBM_CFS:
962 case SND_SOC_DAIFMT_CBS_CFS:
963 ssi_private->i2s_mode |= CCSR_SSI_SCR_I2S_MODE_MASTER;
965 case SND_SOC_DAIFMT_CBM_CFM:
966 ssi_private->i2s_mode |= CCSR_SSI_SCR_I2S_MODE_SLAVE;
972 /* Data on rising edge of bclk, frame low, 1clk before data */
973 strcr |= CCSR_SSI_STCR_TFSI | CCSR_SSI_STCR_TSCKP |
974 CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TEFS;
976 case SND_SOC_DAIFMT_LEFT_J:
977 /* Data on rising edge of bclk, frame high */
978 strcr |= CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TSCKP;
980 case SND_SOC_DAIFMT_DSP_A:
981 /* Data on rising edge of bclk, frame high, 1clk before data */
982 strcr |= CCSR_SSI_STCR_TFSL | CCSR_SSI_STCR_TSCKP |
983 CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TEFS;
985 case SND_SOC_DAIFMT_DSP_B:
986 /* Data on rising edge of bclk, frame high */
987 strcr |= CCSR_SSI_STCR_TFSL | CCSR_SSI_STCR_TSCKP |
988 CCSR_SSI_STCR_TXBIT0;
990 case SND_SOC_DAIFMT_AC97:
991 ssi_private->i2s_mode |= CCSR_SSI_SCR_I2S_MODE_NORMAL;
996 scr |= ssi_private->i2s_mode;
998 /* DAI clock inversion */
999 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
1000 case SND_SOC_DAIFMT_NB_NF:
1001 /* Nothing to do for both normal cases */
1003 case SND_SOC_DAIFMT_IB_NF:
1004 /* Invert bit clock */
1005 strcr ^= CCSR_SSI_STCR_TSCKP;
1007 case SND_SOC_DAIFMT_NB_IF:
1008 /* Invert frame clock */
1009 strcr ^= CCSR_SSI_STCR_TFSI;
1011 case SND_SOC_DAIFMT_IB_IF:
1012 /* Invert both clocks */
1013 strcr ^= CCSR_SSI_STCR_TSCKP;
1014 strcr ^= CCSR_SSI_STCR_TFSI;
1020 /* DAI clock master masks */
1021 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
1022 case SND_SOC_DAIFMT_CBS_CFS:
1023 strcr |= CCSR_SSI_STCR_TFDIR | CCSR_SSI_STCR_TXDIR;
1024 scr |= CCSR_SSI_SCR_SYS_CLK_EN;
1026 case SND_SOC_DAIFMT_CBM_CFM:
1027 scr &= ~CCSR_SSI_SCR_SYS_CLK_EN;
1029 case SND_SOC_DAIFMT_CBM_CFS:
1030 strcr &= ~CCSR_SSI_STCR_TXDIR;
1031 strcr |= CCSR_SSI_STCR_TFDIR;
1032 scr &= ~CCSR_SSI_SCR_SYS_CLK_EN;
1035 if (!fsl_ssi_is_ac97(ssi_private))
1042 if (ssi_private->cpu_dai_drv.symmetric_rates
1043 || fsl_ssi_is_ac97(ssi_private)) {
1044 /* Need to clear RXDIR when using SYNC or AC97 mode */
1045 srcr &= ~CCSR_SSI_SRCR_RXDIR;
1046 scr |= CCSR_SSI_SCR_SYN;
1049 regmap_write(regs, CCSR_SSI_STCR, stcr);
1050 regmap_write(regs, CCSR_SSI_SRCR, srcr);
1051 regmap_write(regs, CCSR_SSI_SCR, scr);
1054 * Set the watermark for transmit FIFI 0 and receive FIFO 0. We don't
1055 * use FIFO 1. We program the transmit water to signal a DMA transfer
1056 * if there are only two (or fewer) elements left in the FIFO. Two
1057 * elements equals one frame (left channel, right channel). This value,
1058 * however, depends on the depth of the transmit buffer.
1060 * We set the watermark on the same level as the DMA burstsize. For
1061 * fiq it is probably better to use the biggest possible watermark
1064 if (ssi_private->use_dma)
1065 wm = ssi_private->fifo_depth - 2;
1067 wm = ssi_private->fifo_depth;
1069 regmap_write(regs, CCSR_SSI_SFCSR,
1070 CCSR_SSI_SFCSR_TFWM0(wm) | CCSR_SSI_SFCSR_RFWM0(wm) |
1071 CCSR_SSI_SFCSR_TFWM1(wm) | CCSR_SSI_SFCSR_RFWM1(wm));
1073 if (ssi_private->use_dual_fifo) {
1074 regmap_update_bits(regs, CCSR_SSI_SRCR, CCSR_SSI_SRCR_RFEN1,
1075 CCSR_SSI_SRCR_RFEN1);
1076 regmap_update_bits(regs, CCSR_SSI_STCR, CCSR_SSI_STCR_TFEN1,
1077 CCSR_SSI_STCR_TFEN1);
1078 regmap_update_bits(regs, CCSR_SSI_SCR, CCSR_SSI_SCR_TCH_EN,
1079 CCSR_SSI_SCR_TCH_EN);
1082 if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) == SND_SOC_DAIFMT_AC97)
1083 fsl_ssi_setup_ac97(ssi_private);
1090 * fsl_ssi_set_dai_fmt - configure Digital Audio Interface Format.
1092 static int fsl_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
1094 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai);
1096 return _fsl_ssi_set_dai_fmt(cpu_dai->dev, ssi_private, fmt);
1100 * fsl_ssi_set_dai_tdm_slot - set TDM slot number
1102 * Note: This function can be only called when using SSI as DAI master
1104 static int fsl_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask,
1105 u32 rx_mask, int slots, int slot_width)
1107 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai);
1108 struct regmap *regs = ssi_private->regs;
1111 /* The slot number should be >= 2 if using Network mode or I2S mode */
1112 regmap_read(regs, CCSR_SSI_SCR, &val);
1113 val &= CCSR_SSI_SCR_I2S_MODE_MASK | CCSR_SSI_SCR_NET;
1114 if (val && slots < 2) {
1115 dev_err(cpu_dai->dev, "slot number should be >= 2 in I2S or NET\n");
1119 regmap_update_bits(regs, CCSR_SSI_STCCR, CCSR_SSI_SxCCR_DC_MASK,
1120 CCSR_SSI_SxCCR_DC(slots));
1121 regmap_update_bits(regs, CCSR_SSI_SRCCR, CCSR_SSI_SxCCR_DC_MASK,
1122 CCSR_SSI_SxCCR_DC(slots));
1124 /* The register SxMSKs needs SSI to provide essential clock due to
1125 * hardware design. So we here temporarily enable SSI to set them.
1127 regmap_read(regs, CCSR_SSI_SCR, &val);
1128 val &= CCSR_SSI_SCR_SSIEN;
1129 regmap_update_bits(regs, CCSR_SSI_SCR, CCSR_SSI_SCR_SSIEN,
1130 CCSR_SSI_SCR_SSIEN);
1132 regmap_write(regs, CCSR_SSI_STMSK, ~tx_mask);
1133 regmap_write(regs, CCSR_SSI_SRMSK, ~rx_mask);
1135 regmap_update_bits(regs, CCSR_SSI_SCR, CCSR_SSI_SCR_SSIEN, val);
1141 * fsl_ssi_trigger: start and stop the DMA transfer.
1143 * This function is called by ALSA to start, stop, pause, and resume the DMA
1146 * The DMA channel is in external master start and pause mode, which
1147 * means the SSI completely controls the flow of data.
1149 static int fsl_ssi_trigger(struct snd_pcm_substream *substream, int cmd,
1150 struct snd_soc_dai *dai)
1152 struct snd_soc_pcm_runtime *rtd = substream->private_data;
1153 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(rtd->cpu_dai);
1154 struct regmap *regs = ssi_private->regs;
1157 case SNDRV_PCM_TRIGGER_START:
1158 case SNDRV_PCM_TRIGGER_RESUME:
1159 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
1160 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1161 fsl_ssi_tx_config(ssi_private, true);
1163 fsl_ssi_rx_config(ssi_private, true);
1166 case SNDRV_PCM_TRIGGER_STOP:
1167 case SNDRV_PCM_TRIGGER_SUSPEND:
1168 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
1169 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1170 fsl_ssi_tx_config(ssi_private, false);
1172 fsl_ssi_rx_config(ssi_private, false);
1179 if (fsl_ssi_is_ac97(ssi_private)) {
1180 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
1181 regmap_write(regs, CCSR_SSI_SOR, CCSR_SSI_SOR_TX_CLR);
1183 regmap_write(regs, CCSR_SSI_SOR, CCSR_SSI_SOR_RX_CLR);
1189 static int fsl_ssi_dai_probe(struct snd_soc_dai *dai)
1191 struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(dai);
1193 if (ssi_private->soc->imx && ssi_private->use_dma) {
1194 dai->playback_dma_data = &ssi_private->dma_params_tx;
1195 dai->capture_dma_data = &ssi_private->dma_params_rx;
1201 static const struct snd_soc_dai_ops fsl_ssi_dai_ops = {
1202 .startup = fsl_ssi_startup,
1203 .shutdown = fsl_ssi_shutdown,
1204 .hw_params = fsl_ssi_hw_params,
1205 .hw_free = fsl_ssi_hw_free,
1206 .set_fmt = fsl_ssi_set_dai_fmt,
1207 .set_sysclk = fsl_ssi_set_dai_sysclk,
1208 .set_tdm_slot = fsl_ssi_set_dai_tdm_slot,
1209 .trigger = fsl_ssi_trigger,
1212 /* Template for the CPU dai driver structure */
1213 static struct snd_soc_dai_driver fsl_ssi_dai_template = {
1214 .probe = fsl_ssi_dai_probe,
1216 .stream_name = "CPU-Playback",
1219 .rates = FSLSSI_I2S_RATES,
1220 .formats = FSLSSI_I2S_FORMATS,
1223 .stream_name = "CPU-Capture",
1226 .rates = FSLSSI_I2S_RATES,
1227 .formats = FSLSSI_I2S_FORMATS,
1229 .ops = &fsl_ssi_dai_ops,
1232 static const struct snd_soc_component_driver fsl_ssi_component = {
1236 static struct snd_soc_dai_driver fsl_ssi_ac97_dai = {
1237 .bus_control = true,
1238 .probe = fsl_ssi_dai_probe,
1240 .stream_name = "AC97 Playback",
1243 .rates = SNDRV_PCM_RATE_8000_48000,
1244 .formats = SNDRV_PCM_FMTBIT_S16_LE,
1247 .stream_name = "AC97 Capture",
1250 .rates = SNDRV_PCM_RATE_48000,
1251 .formats = SNDRV_PCM_FMTBIT_S16_LE,
1253 .ops = &fsl_ssi_dai_ops,
1257 static struct fsl_ssi_private *fsl_ac97_data;
1259 static void fsl_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
1262 struct regmap *regs = fsl_ac97_data->regs;
1270 ret = clk_prepare_enable(fsl_ac97_data->clk);
1272 pr_err("ac97 write clk_prepare_enable failed: %d\n",
1278 regmap_write(regs, CCSR_SSI_SACADD, lreg);
1281 regmap_write(regs, CCSR_SSI_SACDAT, lval);
1283 regmap_update_bits(regs, CCSR_SSI_SACNT, CCSR_SSI_SACNT_RDWR_MASK,
1287 clk_disable_unprepare(fsl_ac97_data->clk);
1290 static unsigned short fsl_ssi_ac97_read(struct snd_ac97 *ac97,
1293 struct regmap *regs = fsl_ac97_data->regs;
1295 unsigned short val = -1;
1300 ret = clk_prepare_enable(fsl_ac97_data->clk);
1302 pr_err("ac97 read clk_prepare_enable failed: %d\n",
1307 lreg = (reg & 0x7f) << 12;
1308 regmap_write(regs, CCSR_SSI_SACADD, lreg);
1309 regmap_update_bits(regs, CCSR_SSI_SACNT, CCSR_SSI_SACNT_RDWR_MASK,
1314 regmap_read(regs, CCSR_SSI_SACDAT, ®_val);
1315 val = (reg_val >> 4) & 0xffff;
1317 clk_disable_unprepare(fsl_ac97_data->clk);
1322 static struct snd_ac97_bus_ops fsl_ssi_ac97_ops = {
1323 .read = fsl_ssi_ac97_read,
1324 .write = fsl_ssi_ac97_write,
1328 * Make every character in a string lower-case
1330 static void make_lowercase(char *s)
1336 if ((c >= 'A') && (c <= 'Z'))
1337 *p = c + ('a' - 'A');
1342 static int fsl_ssi_imx_probe(struct platform_device *pdev,
1343 struct fsl_ssi_private *ssi_private, void __iomem *iomem)
1345 struct device_node *np = pdev->dev.of_node;
1349 if (ssi_private->has_ipg_clk_name)
1350 ssi_private->clk = devm_clk_get(&pdev->dev, "ipg");
1352 ssi_private->clk = devm_clk_get(&pdev->dev, NULL);
1353 if (IS_ERR(ssi_private->clk)) {
1354 ret = PTR_ERR(ssi_private->clk);
1355 dev_err(&pdev->dev, "could not get clock: %d\n", ret);
1359 if (!ssi_private->has_ipg_clk_name) {
1360 ret = clk_prepare_enable(ssi_private->clk);
1362 dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", ret);
1367 /* For those SLAVE implementations, we ignore non-baudclk cases
1368 * and, instead, abandon MASTER mode that needs baud clock.
1370 ssi_private->baudclk = devm_clk_get(&pdev->dev, "baud");
1371 if (IS_ERR(ssi_private->baudclk))
1372 dev_dbg(&pdev->dev, "could not get baud clock: %ld\n",
1373 PTR_ERR(ssi_private->baudclk));
1376 * We have burstsize be "fifo_depth - 2" to match the SSI
1377 * watermark setting in fsl_ssi_startup().
1379 ssi_private->dma_params_tx.maxburst = ssi_private->fifo_depth - 2;
1380 ssi_private->dma_params_rx.maxburst = ssi_private->fifo_depth - 2;
1381 ssi_private->dma_params_tx.addr = ssi_private->ssi_phys + CCSR_SSI_STX0;
1382 ssi_private->dma_params_rx.addr = ssi_private->ssi_phys + CCSR_SSI_SRX0;
1384 ret = of_property_read_u32_array(np, "dmas", dmas, 4);
1385 if (ssi_private->use_dma && !ret && dmas[2] == IMX_DMATYPE_SSI_DUAL) {
1386 ssi_private->use_dual_fifo = true;
1387 /* When using dual fifo mode, we need to keep watermark
1388 * as even numbers due to dma script limitation.
1390 ssi_private->dma_params_tx.maxburst &= ~0x1;
1391 ssi_private->dma_params_rx.maxburst &= ~0x1;
1394 if (!ssi_private->use_dma) {
1397 * Some boards use an incompatible codec. To get it
1398 * working, we are using imx-fiq-pcm-audio, that
1399 * can handle those codecs. DMA is not possible in this
1403 ssi_private->fiq_params.irq = ssi_private->irq;
1404 ssi_private->fiq_params.base = iomem;
1405 ssi_private->fiq_params.dma_params_rx =
1406 &ssi_private->dma_params_rx;
1407 ssi_private->fiq_params.dma_params_tx =
1408 &ssi_private->dma_params_tx;
1410 ret = imx_pcm_fiq_init(pdev, &ssi_private->fiq_params);
1414 ret = imx_pcm_dma_init(pdev, IMX_SSI_DMABUF_SIZE);
1423 if (!ssi_private->has_ipg_clk_name)
1424 clk_disable_unprepare(ssi_private->clk);
1428 static void fsl_ssi_imx_clean(struct platform_device *pdev,
1429 struct fsl_ssi_private *ssi_private)
1431 if (!ssi_private->use_dma)
1432 imx_pcm_fiq_exit(pdev);
1433 if (!ssi_private->has_ipg_clk_name)
1434 clk_disable_unprepare(ssi_private->clk);
1437 static int fsl_ssi_probe(struct platform_device *pdev)
1439 struct fsl_ssi_private *ssi_private;
1441 struct device_node *np = pdev->dev.of_node;
1442 const struct of_device_id *of_id;
1443 const char *p, *sprop;
1444 const uint32_t *iprop;
1445 struct resource *res;
1446 void __iomem *iomem;
1448 struct regmap_config regconfig = fsl_ssi_regconfig;
1450 of_id = of_match_device(fsl_ssi_ids, &pdev->dev);
1451 if (!of_id || !of_id->data)
1454 ssi_private = devm_kzalloc(&pdev->dev, sizeof(*ssi_private),
1457 dev_err(&pdev->dev, "could not allocate DAI object\n");
1461 ssi_private->soc = of_id->data;
1462 ssi_private->dev = &pdev->dev;
1464 sprop = of_get_property(np, "fsl,mode", NULL);
1466 if (!strcmp(sprop, "ac97-slave"))
1467 ssi_private->dai_fmt = SND_SOC_DAIFMT_AC97;
1470 ssi_private->use_dma = !of_property_read_bool(np,
1471 "fsl,fiq-stream-filter");
1473 if (fsl_ssi_is_ac97(ssi_private)) {
1474 memcpy(&ssi_private->cpu_dai_drv, &fsl_ssi_ac97_dai,
1475 sizeof(fsl_ssi_ac97_dai));
1477 fsl_ac97_data = ssi_private;
1479 ret = snd_soc_set_ac97_ops_of_reset(&fsl_ssi_ac97_ops, pdev);
1481 dev_err(&pdev->dev, "could not set AC'97 ops\n");
1485 /* Initialize this copy of the CPU DAI driver structure */
1486 memcpy(&ssi_private->cpu_dai_drv, &fsl_ssi_dai_template,
1487 sizeof(fsl_ssi_dai_template));
1489 ssi_private->cpu_dai_drv.name = dev_name(&pdev->dev);
1491 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1492 iomem = devm_ioremap_resource(&pdev->dev, res);
1494 return PTR_ERR(iomem);
1495 ssi_private->ssi_phys = res->start;
1497 if (ssi_private->soc->imx21regs) {
1499 * According to datasheet imx21-class SSI
1500 * don't have SACC{ST,EN,DIS} regs.
1502 regconfig.max_register = CCSR_SSI_SRMSK;
1505 ret = of_property_match_string(np, "clock-names", "ipg");
1507 ssi_private->has_ipg_clk_name = false;
1508 ssi_private->regs = devm_regmap_init_mmio(&pdev->dev, iomem,
1511 ssi_private->has_ipg_clk_name = true;
1512 ssi_private->regs = devm_regmap_init_mmio_clk(&pdev->dev,
1513 "ipg", iomem, ®config);
1515 if (IS_ERR(ssi_private->regs)) {
1516 dev_err(&pdev->dev, "Failed to init register map\n");
1517 return PTR_ERR(ssi_private->regs);
1520 ssi_private->irq = platform_get_irq(pdev, 0);
1521 if (ssi_private->irq < 0) {
1522 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
1523 return ssi_private->irq;
1526 /* Are the RX and the TX clocks locked? */
1527 if (!of_find_property(np, "fsl,ssi-asynchronous", NULL)) {
1528 if (!fsl_ssi_is_ac97(ssi_private))
1529 ssi_private->cpu_dai_drv.symmetric_rates = 1;
1531 ssi_private->cpu_dai_drv.symmetric_channels = 1;
1532 ssi_private->cpu_dai_drv.symmetric_samplebits = 1;
1535 /* Determine the FIFO depth. */
1536 iprop = of_get_property(np, "fsl,fifo-depth", NULL);
1538 ssi_private->fifo_depth = be32_to_cpup(iprop);
1540 /* Older 8610 DTs didn't have the fifo-depth property */
1541 ssi_private->fifo_depth = 8;
1543 dev_set_drvdata(&pdev->dev, ssi_private);
1545 if (ssi_private->soc->imx) {
1546 ret = fsl_ssi_imx_probe(pdev, ssi_private, iomem);
1551 ret = devm_snd_soc_register_component(&pdev->dev, &fsl_ssi_component,
1552 &ssi_private->cpu_dai_drv, 1);
1554 dev_err(&pdev->dev, "failed to register DAI: %d\n", ret);
1555 goto error_asoc_register;
1558 if (ssi_private->use_dma) {
1559 ret = devm_request_irq(&pdev->dev, ssi_private->irq,
1560 fsl_ssi_isr, 0, dev_name(&pdev->dev),
1563 dev_err(&pdev->dev, "could not claim irq %u\n",
1565 goto error_asoc_register;
1569 ret = fsl_ssi_debugfs_create(&ssi_private->dbg_stats, &pdev->dev);
1571 goto error_asoc_register;
1574 * If codec-handle property is missing from SSI node, we assume
1575 * that the machine driver uses new binding which does not require
1576 * SSI driver to trigger machine driver's probe.
1578 if (!of_get_property(np, "codec-handle", NULL))
1581 /* Trigger the machine driver's probe function. The platform driver
1582 * name of the machine driver is taken from /compatible property of the
1583 * device tree. We also pass the address of the CPU DAI driver
1586 sprop = of_get_property(of_find_node_by_path("/"), "compatible", NULL);
1587 /* Sometimes the compatible name has a "fsl," prefix, so we strip it. */
1588 p = strrchr(sprop, ',');
1591 snprintf(name, sizeof(name), "snd-soc-%s", sprop);
1592 make_lowercase(name);
1595 platform_device_register_data(&pdev->dev, name, 0, NULL, 0);
1596 if (IS_ERR(ssi_private->pdev)) {
1597 ret = PTR_ERR(ssi_private->pdev);
1598 dev_err(&pdev->dev, "failed to register platform: %d\n", ret);
1599 goto error_sound_card;
1603 if (ssi_private->dai_fmt)
1604 _fsl_ssi_set_dai_fmt(&pdev->dev, ssi_private,
1605 ssi_private->dai_fmt);
1607 if (fsl_ssi_is_ac97(ssi_private)) {
1610 ret = of_property_read_u32(np, "cell-index", &ssi_idx);
1612 dev_err(&pdev->dev, "cannot get SSI index property\n");
1613 goto error_sound_card;
1617 platform_device_register_data(NULL,
1618 "ac97-codec", ssi_idx, NULL, 0);
1619 if (IS_ERR(ssi_private->pdev)) {
1620 ret = PTR_ERR(ssi_private->pdev);
1622 "failed to register AC97 codec platform: %d\n",
1624 goto error_sound_card;
1631 fsl_ssi_debugfs_remove(&ssi_private->dbg_stats);
1633 error_asoc_register:
1634 if (ssi_private->soc->imx)
1635 fsl_ssi_imx_clean(pdev, ssi_private);
1640 static int fsl_ssi_remove(struct platform_device *pdev)
1642 struct fsl_ssi_private *ssi_private = dev_get_drvdata(&pdev->dev);
1644 fsl_ssi_debugfs_remove(&ssi_private->dbg_stats);
1646 if (ssi_private->pdev)
1647 platform_device_unregister(ssi_private->pdev);
1649 if (ssi_private->soc->imx)
1650 fsl_ssi_imx_clean(pdev, ssi_private);
1652 if (fsl_ssi_is_ac97(ssi_private))
1653 snd_soc_set_ac97_ops(NULL);
1658 #ifdef CONFIG_PM_SLEEP
1659 static int fsl_ssi_suspend(struct device *dev)
1661 struct fsl_ssi_private *ssi_private = dev_get_drvdata(dev);
1662 struct regmap *regs = ssi_private->regs;
1664 regmap_read(regs, CCSR_SSI_SFCSR,
1665 &ssi_private->regcache_sfcsr);
1666 regmap_read(regs, CCSR_SSI_SACNT,
1667 &ssi_private->regcache_sacnt);
1669 regcache_cache_only(regs, true);
1670 regcache_mark_dirty(regs);
1675 static int fsl_ssi_resume(struct device *dev)
1677 struct fsl_ssi_private *ssi_private = dev_get_drvdata(dev);
1678 struct regmap *regs = ssi_private->regs;
1680 regcache_cache_only(regs, false);
1682 regmap_update_bits(regs, CCSR_SSI_SFCSR,
1683 CCSR_SSI_SFCSR_RFWM1_MASK | CCSR_SSI_SFCSR_TFWM1_MASK |
1684 CCSR_SSI_SFCSR_RFWM0_MASK | CCSR_SSI_SFCSR_TFWM0_MASK,
1685 ssi_private->regcache_sfcsr);
1686 regmap_write(regs, CCSR_SSI_SACNT,
1687 ssi_private->regcache_sacnt);
1689 return regcache_sync(regs);
1691 #endif /* CONFIG_PM_SLEEP */
1693 static const struct dev_pm_ops fsl_ssi_pm = {
1694 SET_SYSTEM_SLEEP_PM_OPS(fsl_ssi_suspend, fsl_ssi_resume)
1697 static struct platform_driver fsl_ssi_driver = {
1699 .name = "fsl-ssi-dai",
1700 .of_match_table = fsl_ssi_ids,
1703 .probe = fsl_ssi_probe,
1704 .remove = fsl_ssi_remove,
1707 module_platform_driver(fsl_ssi_driver);
1709 MODULE_ALIAS("platform:fsl-ssi-dai");
1710 MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
1711 MODULE_DESCRIPTION("Freescale Synchronous Serial Interface (SSI) ASoC Driver");
1712 MODULE_LICENSE("GPL v2");