2 * pxa-ssp.c -- ALSA Soc Audio Layer
4 * Copyright 2005,2008 Wolfson Microelectronics PLC.
5 * Author: Liam Girdwood
6 * Mark Brown <broonie@opensource.wolfsonmicro.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
14 * o Test network mode for > 16bit sample size
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/clk.h>
25 #include <sound/core.h>
26 #include <sound/pcm.h>
27 #include <sound/initval.h>
28 #include <sound/pcm_params.h>
29 #include <sound/soc.h>
30 #include <sound/pxa2xx-lib.h>
32 #include <mach/hardware.h>
34 #include <mach/regs-ssp.h>
35 #include <mach/audio.h>
38 #include "pxa2xx-pcm.h"
42 * SSP audio private data
49 struct ssp_state state;
53 static void dump_registers(struct ssp_device *ssp)
55 dev_dbg(&ssp->pdev->dev, "SSCR0 0x%08x SSCR1 0x%08x SSTO 0x%08x\n",
56 ssp_read_reg(ssp, SSCR0), ssp_read_reg(ssp, SSCR1),
57 ssp_read_reg(ssp, SSTO));
59 dev_dbg(&ssp->pdev->dev, "SSPSP 0x%08x SSSR 0x%08x SSACD 0x%08x\n",
60 ssp_read_reg(ssp, SSPSP), ssp_read_reg(ssp, SSSR),
61 ssp_read_reg(ssp, SSACD));
64 struct pxa2xx_pcm_dma_data {
65 struct pxa2xx_pcm_dma_params params;
69 static struct pxa2xx_pcm_dma_params *
70 ssp_get_dma_params(struct ssp_device *ssp, int width4, int out)
72 struct pxa2xx_pcm_dma_data *dma;
74 dma = kzalloc(sizeof(struct pxa2xx_pcm_dma_data), GFP_KERNEL);
78 snprintf(dma->name, 20, "SSP%d PCM %s %s", ssp->port_id,
79 width4 ? "32-bit" : "16-bit", out ? "out" : "in");
81 dma->params.name = dma->name;
82 dma->params.drcmr = &DRCMR(out ? ssp->drcmr_tx : ssp->drcmr_rx);
83 dma->params.dcmd = (out ? (DCMD_INCSRCADDR | DCMD_FLOWTRG) :
84 (DCMD_INCTRGADDR | DCMD_FLOWSRC)) |
85 (width4 ? DCMD_WIDTH4 : DCMD_WIDTH2) | DCMD_BURST16;
86 dma->params.dev_addr = ssp->phys_base + SSDR;
91 static int pxa_ssp_startup(struct snd_pcm_substream *substream,
92 struct snd_soc_dai *dai)
94 struct snd_soc_pcm_runtime *rtd = substream->private_data;
95 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
96 struct ssp_priv *priv = cpu_dai->private_data;
99 if (!cpu_dai->active) {
100 priv->dev.port = cpu_dai->id + 1;
101 priv->dev.irq = NO_IRQ;
102 clk_enable(priv->dev.ssp->clk);
103 ssp_disable(&priv->dev);
106 if (cpu_dai->dma_data) {
107 kfree(cpu_dai->dma_data);
108 cpu_dai->dma_data = NULL;
113 static void pxa_ssp_shutdown(struct snd_pcm_substream *substream,
114 struct snd_soc_dai *dai)
116 struct snd_soc_pcm_runtime *rtd = substream->private_data;
117 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
118 struct ssp_priv *priv = cpu_dai->private_data;
120 if (!cpu_dai->active) {
121 ssp_disable(&priv->dev);
122 clk_disable(priv->dev.ssp->clk);
125 if (cpu_dai->dma_data) {
126 kfree(cpu_dai->dma_data);
127 cpu_dai->dma_data = NULL;
133 static int pxa_ssp_suspend(struct snd_soc_dai *cpu_dai)
135 struct ssp_priv *priv = cpu_dai->private_data;
137 if (!cpu_dai->active)
140 ssp_save_state(&priv->dev, &priv->state);
141 clk_disable(priv->dev.ssp->clk);
145 static int pxa_ssp_resume(struct snd_soc_dai *cpu_dai)
147 struct ssp_priv *priv = cpu_dai->private_data;
149 if (!cpu_dai->active)
152 clk_enable(priv->dev.ssp->clk);
153 ssp_restore_state(&priv->dev, &priv->state);
154 ssp_enable(&priv->dev);
160 #define pxa_ssp_suspend NULL
161 #define pxa_ssp_resume NULL
165 * ssp_set_clkdiv - set SSP clock divider
166 * @div: serial clock rate divider
168 static void ssp_set_scr(struct ssp_device *ssp, u32 div)
170 u32 sscr0 = ssp_read_reg(ssp, SSCR0);
172 if (cpu_is_pxa25x() && ssp->type == PXA25x_SSP) {
173 sscr0 &= ~0x0000ff00;
174 sscr0 |= ((div - 2)/2) << 8; /* 2..512 */
176 sscr0 &= ~0x000fff00;
177 sscr0 |= (div - 1) << 8; /* 1..4096 */
179 ssp_write_reg(ssp, SSCR0, sscr0);
183 * ssp_get_clkdiv - get SSP clock divider
185 static u32 ssp_get_scr(struct ssp_device *ssp)
187 u32 sscr0 = ssp_read_reg(ssp, SSCR0);
190 if (cpu_is_pxa25x() && ssp->type == PXA25x_SSP)
191 div = ((sscr0 >> 8) & 0xff) * 2 + 2;
193 div = ((sscr0 >> 8) & 0xfff) + 1;
198 * Set the SSP ports SYSCLK.
200 static int pxa_ssp_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
201 int clk_id, unsigned int freq, int dir)
203 struct ssp_priv *priv = cpu_dai->private_data;
204 struct ssp_device *ssp = priv->dev.ssp;
207 u32 sscr0 = ssp_read_reg(ssp, SSCR0) &
208 ~(SSCR0_ECS | SSCR0_NCS | SSCR0_MOD | SSCR0_ACS);
210 dev_dbg(&ssp->pdev->dev,
211 "pxa_ssp_set_dai_sysclk id: %d, clk_id %d, freq %u\n",
212 cpu_dai->id, clk_id, freq);
215 case PXA_SSP_CLK_NET_PLL:
218 case PXA_SSP_CLK_PLL:
219 /* Internal PLL is fixed */
221 priv->sysclk = 1843200;
223 priv->sysclk = 13000000;
225 case PXA_SSP_CLK_EXT:
229 case PXA_SSP_CLK_NET:
231 sscr0 |= SSCR0_NCS | SSCR0_MOD;
233 case PXA_SSP_CLK_AUDIO:
242 /* The SSP clock must be disabled when changing SSP clock mode
243 * on PXA2xx. On PXA3xx it must be enabled when doing so. */
244 if (!cpu_is_pxa3xx())
245 clk_disable(priv->dev.ssp->clk);
246 val = ssp_read_reg(ssp, SSCR0) | sscr0;
247 ssp_write_reg(ssp, SSCR0, val);
248 if (!cpu_is_pxa3xx())
249 clk_enable(priv->dev.ssp->clk);
255 * Set the SSP clock dividers.
257 static int pxa_ssp_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,
260 struct ssp_priv *priv = cpu_dai->private_data;
261 struct ssp_device *ssp = priv->dev.ssp;
265 case PXA_SSP_AUDIO_DIV_ACDS:
266 val = (ssp_read_reg(ssp, SSACD) & ~0x7) | SSACD_ACDS(div);
267 ssp_write_reg(ssp, SSACD, val);
269 case PXA_SSP_AUDIO_DIV_SCDB:
270 val = ssp_read_reg(ssp, SSACD);
272 #if defined(CONFIG_PXA3xx)
277 case PXA_SSP_CLK_SCDB_1:
280 case PXA_SSP_CLK_SCDB_4:
282 #if defined(CONFIG_PXA3xx)
283 case PXA_SSP_CLK_SCDB_8:
293 ssp_write_reg(ssp, SSACD, val);
295 case PXA_SSP_DIV_SCR:
296 ssp_set_scr(ssp, div);
306 * Configure the PLL frequency pxa27x and (afaik - pxa320 only)
308 static int pxa_ssp_set_dai_pll(struct snd_soc_dai *cpu_dai,
309 int pll_id, unsigned int freq_in, unsigned int freq_out)
311 struct ssp_priv *priv = cpu_dai->private_data;
312 struct ssp_device *ssp = priv->dev.ssp;
313 u32 ssacd = ssp_read_reg(ssp, SSACD) & ~0x70;
315 #if defined(CONFIG_PXA3xx)
317 ssp_write_reg(ssp, SSACDD, 0);
344 /* PXA3xx has a clock ditherer which can be used to generate
345 * a wider range of frequencies - calculate a value for it.
347 if (cpu_is_pxa3xx()) {
351 do_div(tmp, freq_out);
354 val = (val << 16) | 64;;
355 ssp_write_reg(ssp, SSACDD, val);
359 dev_dbg(&ssp->pdev->dev,
360 "Using SSACDD %x to supply %uHz\n",
369 ssp_write_reg(ssp, SSACD, ssacd);
375 * Set the active slots in TDM/Network mode
377 static int pxa_ssp_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,
378 unsigned int mask, int slots)
380 struct ssp_priv *priv = cpu_dai->private_data;
381 struct ssp_device *ssp = priv->dev.ssp;
384 sscr0 = ssp_read_reg(ssp, SSCR0) & ~SSCR0_SlotsPerFrm(7);
386 /* set number of active slots */
387 sscr0 |= SSCR0_SlotsPerFrm(slots);
388 ssp_write_reg(ssp, SSCR0, sscr0);
390 /* set active slot mask */
391 ssp_write_reg(ssp, SSTSA, mask);
392 ssp_write_reg(ssp, SSRSA, mask);
397 * Tristate the SSP DAI lines
399 static int pxa_ssp_set_dai_tristate(struct snd_soc_dai *cpu_dai,
402 struct ssp_priv *priv = cpu_dai->private_data;
403 struct ssp_device *ssp = priv->dev.ssp;
406 sscr1 = ssp_read_reg(ssp, SSCR1);
411 ssp_write_reg(ssp, SSCR1, sscr1);
417 * Set up the SSP DAI format.
418 * The SSP Port must be inactive before calling this function as the
419 * physical interface format is changed.
421 static int pxa_ssp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
424 struct ssp_priv *priv = cpu_dai->private_data;
425 struct ssp_device *ssp = priv->dev.ssp;
430 /* check if we need to change anything at all */
431 if (priv->dai_fmt == fmt)
434 /* we can only change the settings if the port is not in use */
435 if (ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) {
436 dev_err(&ssp->pdev->dev,
437 "can't change hardware dai format: stream is in use");
441 /* reset port settings */
442 sscr0 = ssp_read_reg(ssp, SSCR0) &
443 (SSCR0_ECS | SSCR0_NCS | SSCR0_MOD | SSCR0_ACS);
444 sscr1 = SSCR1_RxTresh(8) | SSCR1_TxTresh(7);
447 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
448 case SND_SOC_DAIFMT_CBM_CFM:
449 sscr1 |= SSCR1_SCLKDIR | SSCR1_SFRMDIR;
451 case SND_SOC_DAIFMT_CBM_CFS:
452 sscr1 |= SSCR1_SCLKDIR;
454 case SND_SOC_DAIFMT_CBS_CFS:
460 ssp_write_reg(ssp, SSCR0, sscr0);
461 ssp_write_reg(ssp, SSCR1, sscr1);
462 ssp_write_reg(ssp, SSPSP, sspsp);
464 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
465 case SND_SOC_DAIFMT_I2S:
467 sscr1 |= SSCR1_RWOT | SSCR1_TRAIL;
469 /* See hw_params() */
470 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
471 case SND_SOC_DAIFMT_NB_NF:
472 sspsp |= SSPSP_SFRMP;
474 case SND_SOC_DAIFMT_NB_IF:
476 case SND_SOC_DAIFMT_IB_IF:
477 sspsp |= SSPSP_SCMODE(2);
479 case SND_SOC_DAIFMT_IB_NF:
480 sspsp |= SSPSP_SCMODE(2) | SSPSP_SFRMP;
487 case SND_SOC_DAIFMT_DSP_A:
489 case SND_SOC_DAIFMT_DSP_B:
490 sscr0 |= SSCR0_MOD | SSCR0_PSP;
491 sscr1 |= SSCR1_TRAIL | SSCR1_RWOT;
493 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
494 case SND_SOC_DAIFMT_NB_NF:
495 sspsp |= SSPSP_SFRMP;
497 case SND_SOC_DAIFMT_NB_IF:
499 case SND_SOC_DAIFMT_IB_IF:
500 sspsp |= SSPSP_SCMODE(2);
502 case SND_SOC_DAIFMT_IB_NF:
503 sspsp |= SSPSP_SCMODE(2) | SSPSP_SFRMP;
514 ssp_write_reg(ssp, SSCR0, sscr0);
515 ssp_write_reg(ssp, SSCR1, sscr1);
516 ssp_write_reg(ssp, SSPSP, sspsp);
520 /* Since we are configuring the timings for the format by hand
521 * we have to defer some things until hw_params() where we
522 * know parameters like the sample size.
530 * Set the SSP audio DMA parameters and sample size.
531 * Can be called multiple times by oss emulation.
533 static int pxa_ssp_hw_params(struct snd_pcm_substream *substream,
534 struct snd_pcm_hw_params *params,
535 struct snd_soc_dai *dai)
537 struct snd_soc_pcm_runtime *rtd = substream->private_data;
538 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
539 struct ssp_priv *priv = cpu_dai->private_data;
540 struct ssp_device *ssp = priv->dev.ssp;
541 int chn = params_channels(params);
544 int width = snd_pcm_format_physical_width(params_format(params));
545 int ttsa = ssp_read_reg(ssp, SSTSA) & 0xf;
547 /* generate correct DMA params */
548 if (cpu_dai->dma_data)
549 kfree(cpu_dai->dma_data);
551 /* Network mode with one active slot (ttsa == 1) can be used
552 * to force 16-bit frame width on the wire (for S16_LE), even
553 * with two channels. Use 16-bit DMA transfers for this case.
555 cpu_dai->dma_data = ssp_get_dma_params(ssp,
556 ((chn == 2) && (ttsa != 1)) || (width == 32),
557 substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
559 /* we can only change the settings if the port is not in use */
560 if (ssp_read_reg(ssp, SSCR0) & SSCR0_SSE)
563 /* clear selected SSP bits */
564 sscr0 = ssp_read_reg(ssp, SSCR0) & ~(SSCR0_DSS | SSCR0_EDSS);
565 ssp_write_reg(ssp, SSCR0, sscr0);
568 sscr0 = ssp_read_reg(ssp, SSCR0);
569 switch (params_format(params)) {
570 case SNDRV_PCM_FORMAT_S16_LE:
573 sscr0 |= SSCR0_FPCKE;
575 sscr0 |= SSCR0_DataSize(16);
577 case SNDRV_PCM_FORMAT_S24_LE:
578 sscr0 |= (SSCR0_EDSS | SSCR0_DataSize(8));
580 case SNDRV_PCM_FORMAT_S32_LE:
581 sscr0 |= (SSCR0_EDSS | SSCR0_DataSize(16));
584 ssp_write_reg(ssp, SSCR0, sscr0);
586 switch (priv->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
587 case SND_SOC_DAIFMT_I2S:
588 sspsp = ssp_read_reg(ssp, SSPSP);
590 if ((ssp_get_scr(ssp) == 4) && (width == 16)) {
591 /* This is a special case where the bitclk is 64fs
592 * and we're not dealing with 2*32 bits of audio
595 * The SSP values used for that are all found out by
596 * trying and failing a lot; some of the registers
597 * needed for that mode are only available on PXA3xx.
601 if (!cpu_is_pxa3xx())
604 sspsp |= SSPSP_SFRMWDTH(width * 2);
605 sspsp |= SSPSP_SFRMDLY(width * 4);
606 sspsp |= SSPSP_EDMYSTOP(3);
607 sspsp |= SSPSP_DMYSTOP(3);
608 sspsp |= SSPSP_DMYSTRT(1);
613 /* The frame width is the width the LRCLK is
614 * asserted for; the delay is expressed in
615 * half cycle units. We need the extra cycle
616 * because the data starts clocking out one BCLK
617 * after LRCLK changes polarity.
619 sspsp |= SSPSP_SFRMWDTH(width + 1);
620 sspsp |= SSPSP_SFRMDLY((width + 1) * 2);
621 sspsp |= SSPSP_DMYSTRT(1);
624 ssp_write_reg(ssp, SSPSP, sspsp);
630 /* When we use a network mode, we always require TDM slots
631 * - complain loudly and fail if they've not been set up yet.
633 if ((sscr0 & SSCR0_MOD) && !ttsa) {
634 dev_err(&ssp->pdev->dev, "No TDM timeslot configured\n");
643 static int pxa_ssp_trigger(struct snd_pcm_substream *substream, int cmd,
644 struct snd_soc_dai *dai)
646 struct snd_soc_pcm_runtime *rtd = substream->private_data;
647 struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
649 struct ssp_priv *priv = cpu_dai->private_data;
650 struct ssp_device *ssp = priv->dev.ssp;
654 case SNDRV_PCM_TRIGGER_RESUME:
655 ssp_enable(&priv->dev);
657 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
658 val = ssp_read_reg(ssp, SSCR1);
659 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
663 ssp_write_reg(ssp, SSCR1, val);
664 val = ssp_read_reg(ssp, SSSR);
665 ssp_write_reg(ssp, SSSR, val);
667 case SNDRV_PCM_TRIGGER_START:
668 val = ssp_read_reg(ssp, SSCR1);
669 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
673 ssp_write_reg(ssp, SSCR1, val);
674 ssp_enable(&priv->dev);
676 case SNDRV_PCM_TRIGGER_STOP:
677 val = ssp_read_reg(ssp, SSCR1);
678 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
682 ssp_write_reg(ssp, SSCR1, val);
684 case SNDRV_PCM_TRIGGER_SUSPEND:
685 ssp_disable(&priv->dev);
687 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
688 val = ssp_read_reg(ssp, SSCR1);
689 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
693 ssp_write_reg(ssp, SSCR1, val);
705 static int pxa_ssp_probe(struct platform_device *pdev,
706 struct snd_soc_dai *dai)
708 struct ssp_priv *priv;
711 priv = kzalloc(sizeof(struct ssp_priv), GFP_KERNEL);
715 priv->dev.ssp = ssp_request(dai->id + 1, "SoC audio");
716 if (priv->dev.ssp == NULL) {
721 priv->dai_fmt = (unsigned int) -1;
722 dai->private_data = priv;
731 static void pxa_ssp_remove(struct platform_device *pdev,
732 struct snd_soc_dai *dai)
734 struct ssp_priv *priv = dai->private_data;
735 ssp_free(priv->dev.ssp);
738 #define PXA_SSP_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
739 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
740 SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | \
741 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
743 #define PXA_SSP_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
744 SNDRV_PCM_FMTBIT_S24_LE | \
745 SNDRV_PCM_FMTBIT_S32_LE)
747 static struct snd_soc_dai_ops pxa_ssp_dai_ops = {
748 .startup = pxa_ssp_startup,
749 .shutdown = pxa_ssp_shutdown,
750 .trigger = pxa_ssp_trigger,
751 .hw_params = pxa_ssp_hw_params,
752 .set_sysclk = pxa_ssp_set_dai_sysclk,
753 .set_clkdiv = pxa_ssp_set_dai_clkdiv,
754 .set_pll = pxa_ssp_set_dai_pll,
755 .set_fmt = pxa_ssp_set_dai_fmt,
756 .set_tdm_slot = pxa_ssp_set_dai_tdm_slot,
757 .set_tristate = pxa_ssp_set_dai_tristate,
760 struct snd_soc_dai pxa_ssp_dai[] = {
762 .name = "pxa2xx-ssp1",
764 .probe = pxa_ssp_probe,
765 .remove = pxa_ssp_remove,
766 .suspend = pxa_ssp_suspend,
767 .resume = pxa_ssp_resume,
771 .rates = PXA_SSP_RATES,
772 .formats = PXA_SSP_FORMATS,
777 .rates = PXA_SSP_RATES,
778 .formats = PXA_SSP_FORMATS,
780 .ops = &pxa_ssp_dai_ops,
782 { .name = "pxa2xx-ssp2",
784 .probe = pxa_ssp_probe,
785 .remove = pxa_ssp_remove,
786 .suspend = pxa_ssp_suspend,
787 .resume = pxa_ssp_resume,
791 .rates = PXA_SSP_RATES,
792 .formats = PXA_SSP_FORMATS,
797 .rates = PXA_SSP_RATES,
798 .formats = PXA_SSP_FORMATS,
800 .ops = &pxa_ssp_dai_ops,
803 .name = "pxa2xx-ssp3",
805 .probe = pxa_ssp_probe,
806 .remove = pxa_ssp_remove,
807 .suspend = pxa_ssp_suspend,
808 .resume = pxa_ssp_resume,
812 .rates = PXA_SSP_RATES,
813 .formats = PXA_SSP_FORMATS,
818 .rates = PXA_SSP_RATES,
819 .formats = PXA_SSP_FORMATS,
821 .ops = &pxa_ssp_dai_ops,
824 .name = "pxa2xx-ssp4",
826 .probe = pxa_ssp_probe,
827 .remove = pxa_ssp_remove,
828 .suspend = pxa_ssp_suspend,
829 .resume = pxa_ssp_resume,
833 .rates = PXA_SSP_RATES,
834 .formats = PXA_SSP_FORMATS,
839 .rates = PXA_SSP_RATES,
840 .formats = PXA_SSP_FORMATS,
842 .ops = &pxa_ssp_dai_ops,
845 EXPORT_SYMBOL_GPL(pxa_ssp_dai);
847 static int __init pxa_ssp_init(void)
849 return snd_soc_register_dais(pxa_ssp_dai, ARRAY_SIZE(pxa_ssp_dai));
851 module_init(pxa_ssp_init);
853 static void __exit pxa_ssp_exit(void)
855 snd_soc_unregister_dais(pxa_ssp_dai, ARRAY_SIZE(pxa_ssp_dai));
857 module_exit(pxa_ssp_exit);
859 /* Module information */
860 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
861 MODULE_DESCRIPTION("PXA SSP/PCM SoC Interface");
862 MODULE_LICENSE("GPL");