diff options
Diffstat (limited to 'sound/soc/at91')
| -rw-r--r-- | sound/soc/at91/at91-i2s.c | 618 | ||||
| -rw-r--r-- | sound/soc/at91/at91-i2s.h | 27 |
2 files changed, 356 insertions, 289 deletions
diff --git a/sound/soc/at91/at91-i2s.c b/sound/soc/at91/at91-i2s.c index 876d391..fcc544a 100644 --- a/sound/soc/at91/at91-i2s.c +++ b/sound/soc/at91/at91-i2s.c @@ -12,8 +12,6 @@ * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * - * Revision history - * 3rd Mar 2006 Initial version. */ #include <linux/init.h> @@ -34,6 +32,7 @@ #include <asm/arch/at91_pdc.h> #include "at91-pcm.h" +#include "at91-i2s.h" #if 0 #define DBG(x...) printk(KERN_DEBUG "at91-i2s:" x) @@ -48,65 +47,6 @@ #endif -#define AT91_I2S_DAIFMT \ - (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS | SND_SOC_DAIFMT_NB_NF) - -#define AT91_I2S_DIR \ - (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE) - -/* priv is (SSC_CMR.DIV << 16 | SSC_TCMR.PERIOD ) */ -static struct snd_soc_dai_mode at91_i2s[] = { - - /* 8k: BCLK = (MCLK/10) = (60MHz/50) = 1.2MHz */ - { - .fmt = AT91_I2S_DAIFMT, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_8000, - .pcmdir = AT91_I2S_DIR, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 1500, - .bfs = SND_SOC_FSBD(10), - .priv = (25 << 16 | 74), - }, - - /* 16k: BCLK = (MCLK/3) ~= (60MHz/14) = 4.285714MHz */ - { - .fmt = AT91_I2S_DAIFMT, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_16000, - .pcmdir = AT91_I2S_DIR, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 750, - .bfs = SND_SOC_FSBD(3), - .priv = (7 << 16 | 133), - }, - - /* 32k: BCLK = (MCLK/3) ~= (60MHz/14) = 4.285714MHz */ - { - .fmt = AT91_I2S_DAIFMT, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_32000, - .pcmdir = AT91_I2S_DIR, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 375, - .bfs = SND_SOC_FSBD(3), - .priv = (7 << 16 | 66), - }, - - /* 48k: BCLK = (MCLK/5) ~= (60MHz/26) = 2.3076923MHz */ - { - .fmt = AT91_I2S_DAIFMT, - .pcmfmt = SNDRV_PCM_FMTBIT_S16_LE, - .pcmrate = SNDRV_PCM_RATE_48000, - .pcmdir = AT91_I2S_DIR, - .flags = SND_SOC_DAI_BFS_DIV, - .fs = 250, - .bfs = SND_SOC_FSBD(5), - .priv = (13 << 16 | 23), - }, -}; - - /* * SSC PDC registers required by the PCM DMA engine. */ @@ -184,21 +124,6 @@ static struct at91_pcm_dma_params ssc_dma_params[NUM_SSC_DEVICES][2] = { #endif }; - -/* - * A MUTEX is used to protect an SSC initialzed flag which allows - * the substream hw_params() call to initialize the SSC only if - * there are no other substreams open. If there are other - * substreams open, the hw_param() call can only check that - * it is using the same format and rate. - */ -static DECLARE_MUTEX(ssc0_mutex); -#if NUM_SSC_DEVICES == 3 -static DECLARE_MUTEX(ssc1_mutex); -static DECLARE_MUTEX(ssc2_mutex); -#endif - - struct at91_ssc_state { u32 ssc_cmr; u32 ssc_rcmr; @@ -209,16 +134,16 @@ struct at91_ssc_state { u32 ssc_imr; }; - static struct at91_ssc_info { char *name; struct at91_ssc_periph ssc; spinlock_t lock; /* lock for dir_mask */ - int dir_mask; /* 0=unused, 1=playback, 2=capture */ - struct semaphore *mutex; - int initialized; - int pcmfmt; - int rate; + unsigned short dir_mask; /* 0=unused, 1=playback, 2=capture */ + unsigned short initialized; /* 1=SSC has been initialized */ + unsigned short daifmt; + unsigned short cmr_div; + unsigned short tcmr_period; + unsigned short rcmr_period; struct at91_pcm_dma_params *dma_params[2]; struct at91_ssc_state ssc_state; @@ -227,7 +152,6 @@ static struct at91_ssc_info { .name = "ssc0", .lock = SPIN_LOCK_UNLOCKED, .dir_mask = 0, - .mutex = &ssc0_mutex, .initialized = 0, }, #if NUM_SSC_DEVICES == 3 @@ -235,20 +159,23 @@ static struct at91_ssc_info { .name = "ssc1", .lock = SPIN_LOCK_UNLOCKED, .dir_mask = 0, - .mutex = &ssc1_mutex, .initialized = 0, }, { .name = "ssc2", .lock = SPIN_LOCK_UNLOCKED, .dir_mask = 0, - .mutex = &ssc2_mutex, .initialized = 0, }, #endif }; +static unsigned int at91_i2s_sysclk; +/* + * SSC interrupt handler. Passes PDC interrupts to the DMA + * interrupt handler in the PCM driver. + */ static irqreturn_t at91_i2s_interrupt(int irq, void *dev_id) { struct at91_ssc_info *ssc_p = dev_id; @@ -278,10 +205,13 @@ static irqreturn_t at91_i2s_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } +/* + * Startup. Only that one substream allowed in each direction. + */ static int at91_i2s_startup(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct at91_ssc_info *ssc_p = &ssc_info[rtd->cpu_dai->id]; + struct at91_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id]; int dir_mask; DBG("i2s_startup: SSC_SR=0x%08lx\n", @@ -296,24 +226,22 @@ static int at91_i2s_startup(struct snd_pcm_substream *substream) ssc_p->dir_mask |= dir_mask; spin_unlock_irq(&ssc_p->lock); - /* - * dma_data is not set until hw_params() is called and - * shutdown() depends on this value being NULL if hw_params() - * was not called. - */ - rtd->cpu_dai->dma_data = NULL; - return 0; } +/* + * Shutdown. Clear DMA parameters and shutdown the SSC if there + * are no other substreams open. + */ static void at91_i2s_shutdown(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct at91_ssc_info *ssc_p = &ssc_info[rtd->cpu_dai->id]; - struct at91_pcm_dma_params *dma_params = rtd->cpu_dai->dma_data; + struct at91_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id]; + struct at91_pcm_dma_params *dma_params; int dir, dir_mask; dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1; + dma_params = ssc_p->dma_params[dir]; if (dma_params != NULL) { at91_ssc_write(dma_params->ssc_base + AT91_SSC_CR, @@ -335,99 +263,107 @@ static void at91_i2s_shutdown(struct snd_pcm_substream *substream) DBG("Stopping pid %d clock\n", ssc_p->ssc.pid); at91_sys_write(AT91_PMC_PCDR, 1<<ssc_p->ssc.pid); - if (ssc_p->initialized) + if (ssc_p->initialized) { free_irq(ssc_p->ssc.pid, ssc_p); + ssc_p->initialized = 0; + } /* Reset the SSC */ at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR, AT91_SSC_SWRST); - /* Force a re-init on the next hw_params() call. */ - ssc_p->initialized = 0; + /* Clear the SSC dividers */ + ssc_p->cmr_div = ssc_p->tcmr_period = ssc_p->rcmr_period = 0; } spin_unlock_irq(&ssc_p->lock); } -#ifdef CONFIG_PM -static int at91_i2s_suspend(struct platform_device *pdev, - struct snd_soc_cpu_dai *dai) +/* + * Record the SSC system clock rate. + */ +static int at91_i2s_set_dai_sysclk(struct snd_soc_cpu_dai *cpu_dai, + int clk_id, unsigned int freq, int dir) { - struct at91_ssc_info *ssc_p; - - if(!dai->active) - return 0; - - ssc_p = &ssc_info[dai->id]; - - /* Save the status register before disabling transmit and receive. */ - ssc_p->ssc_state.ssc_sr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_SR); - at91_ssc_write(ssc_p->ssc.base + - AT91_SSC_CR, AT91_SSC_TXDIS | AT91_SSC_RXDIS); - - /* Save the current interrupt mask, then disable unmasked interrupts. */ - ssc_p->ssc_state.ssc_imr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_IMR); - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_IDR, ssc_p->ssc_state.ssc_imr); - - ssc_p->ssc_state.ssc_cmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_CMR); - ssc_p->ssc_state.ssc_rcmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RCMR); - ssc_p->ssc_state.ssc_rfmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RCMR); - ssc_p->ssc_state.ssc_tcmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RCMR); - ssc_p->ssc_state.ssc_tfmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RCMR); + /* + * The only clock supplied to the SSC is the AT91 master clock, + * which is only used if the SSC is generating BCLK and/or + * LRC clocks. + */ + switch (clk_id) { + case AT91_SYSCLK_MCK: + at91_i2s_sysclk = freq; + break; + default: + return -EINVAL; + } return 0; } -static int at91_i2s_resume(struct platform_device *pdev, - struct snd_soc_cpu_dai *dai) +/* + * Record the DAI format for use in hw_params(). + */ +static int at91_i2s_set_dai_fmt(struct snd_soc_cpu_dai *cpu_dai, + unsigned int fmt) { - struct at91_ssc_info *ssc_p; - u32 cr_mask; - - if(!dai->active) - return 0; - - ssc_p = &ssc_info[dai->id]; + struct at91_ssc_info *ssc_p = &ssc_info[cpu_dai->id]; - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, ssc_p->ssc_state.ssc_tfmr); - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, ssc_p->ssc_state.ssc_tcmr); - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, ssc_p->ssc_state.ssc_rfmr); - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, ssc_p->ssc_state.ssc_rcmr); - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CMR, ssc_p->ssc_state.ssc_cmr); - - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_IER, ssc_p->ssc_state.ssc_imr); - - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR, - ((ssc_p->ssc_state.ssc_sr & AT91_SSC_RXENA) ? AT91_SSC_RXEN : 0) | - ((ssc_p->ssc_state.ssc_sr & AT91_SSC_TXENA) ? AT91_SSC_TXEN : 0)); + if ((fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_I2S) + return -EINVAL; + ssc_p->daifmt = fmt; return 0; } -#else -#define at91_i2s_suspend NULL -#define at91_i2s_resume NULL -#endif - -static unsigned int at91_i2s_config_sysclk( - struct snd_soc_cpu_dai *iface, struct snd_soc_clock_info *info, - unsigned int clk) +/* + * Record SSC clock dividers for use in hw_params(). + */ +static int at91_i2s_set_dai_clkdiv(struct snd_soc_cpu_dai *cpu_dai, + int div_id, int div) { - /* Currently, there is only support for USB (12Mhz) mode */ - if (clk != 12000000) - return 0; - return 12000000; + struct at91_ssc_info *ssc_p = &ssc_info[cpu_dai->id]; + + switch (div_id) { + case AT91SSC_CMR_DIV: + /* + * The same master clock divider is used for both + * transmit and receive, so if a value has already + * been set, it must match this value. + */ + if (ssc_p->cmr_div == 0) + ssc_p->cmr_div = div; + else + if (div != ssc_p->cmr_div) + return -EBUSY; + break; + + case AT91SSC_TCMR_PERIOD: + ssc_p->tcmr_period = div; + break; + + case AT91SSC_RCMR_PERIOD: + ssc_p->rcmr_period = div; + break; + + default: + return -EINVAL; + } + + return 0; } +/* + * Configure the SSC. + */ static int at91_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_soc_pcm_runtime *rtd = substream->private_data; - int id = rtd->cpu_dai->id; + int id = rtd->dai->cpu_dai->id; struct at91_ssc_info *ssc_p = &ssc_info[id]; struct at91_pcm_dma_params *dma_params; - unsigned int pcmfmt, rate; int dir, channels, bits; - struct clk *mck_clk; - u32 div, period, tfmr, rfmr, tcmr, rcmr; + u32 tfmr, rfmr, tcmr, rcmr; + int start_event; int ret; /* @@ -442,44 +378,134 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream, dma_params->substream = substream; ssc_p->dma_params[dir] = dma_params; - rtd->cpu_dai->dma_data = dma_params; - rate = params_rate(params); - channels = params_channels(params); + /* + * The cpu_dai->dma_data field is only used to communicate the + * appropriate DMA parameters to the pcm driver hw_params() + * function. It should not be used for other purposes + * as it is common to all substreams. + */ + rtd->dai->cpu_dai->dma_data = dma_params; - pcmfmt = rtd->cpu_dai->dai_runtime.pcmfmt; - switch (pcmfmt) { - case SNDRV_PCM_FMTBIT_S16_LE: - /* likely this is all we'll ever support, but ... */ - bits = 16; - dma_params->pdc_xfer_size = 2; - break; - default: - printk(KERN_WARNING "at91-i2s: unsupported format %x\n", - pcmfmt); - return -EINVAL; - } + channels = params_channels(params); - /* Don't allow both SSC substreams to initialize at the same time. */ - down(ssc_p->mutex); + /* + * The SSC only supports up to 16-bit samples in I2S format, due + * to the size of the Frame Mode Register FSLEN field. Also, I2S + * implies signed data. + */ + bits = 16; + dma_params->pdc_xfer_size = 2; /* - * If this SSC is alreadly initialized, then this substream must use - * the same format and rate. + * Compute SSC register settings. */ - if (ssc_p->initialized) { - if (pcmfmt != ssc_p->pcmfmt || rate != ssc_p->rate) { - printk(KERN_WARNING "at91-i2s: " - "incompatible substream in other direction\n"); - up(ssc_p->mutex); - return -EINVAL; - } - } else { + switch (ssc_p->daifmt) { + case SND_SOC_DAIFMT_CBS_CFS: + /* + * SSC provides BCLK and LRC clocks. + * + * The SSC transmit and receive clocks are generated from the + * MCK divider, and the BCLK signal is output on the SSC TK line. + */ + rcmr = (( ssc_p->rcmr_period << 24) & AT91_SSC_PERIOD) + | (( 1 << 16) & AT91_SSC_STTDLY) + | (( AT91_SSC_START_FALLING_RF ) & AT91_SSC_START) + | (( AT91_SSC_CK_RISING ) & AT91_SSC_CKI) + | (( AT91_SSC_CKO_NONE ) & AT91_SSC_CKO) + | (( AT91_SSC_CKS_DIV ) & AT91_SSC_CKS); + + rfmr = (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE) + | (( AT91_SSC_FSOS_NEGATIVE ) & AT91_SSC_FSOS) + | (((bits - 1) << 16) & AT91_SSC_FSLEN) + | (((channels - 1) << 8) & AT91_SSC_DATNB) + | (( 1 << 7) & AT91_SSC_MSBF) + | (( 0 << 5) & AT91_SSC_LOOP) + | (((bits - 1) << 0) & AT91_SSC_DATALEN); + + tcmr = (( ssc_p->tcmr_period << 24) & AT91_SSC_PERIOD) + | (( 1 << 16) & AT91_SSC_STTDLY) + | (( AT91_SSC_START_FALLING_RF ) & AT91_SSC_START) + | (( AT91_SSC_CKI_FALLING ) & AT91_SSC_CKI) + | (( AT91_SSC_CKO_CONTINUOUS ) & AT91_SSC_CKO) + | (( AT91_SSC_CKS_DIV ) & AT91_SSC_CKS); + + tfmr = (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE) + | (( 0 << 23) & AT91_SSC_FSDEN) + | (( AT91_SSC_FSOS_NEGATIVE ) & AT91_SSC_FSOS) + | (((bits - 1) << 16) & AT91_SSC_FSLEN) + | (((channels - 1) << 8) & AT91_SSC_DATNB) + | (( 1 << 7) & AT91_SSC_MSBF) + | (( 0 << 5) & AT91_SSC_DATDEF) + | (((bits - 1) << 0) & AT91_SSC_DATALEN); + break; + + case SND_SOC_DAIFMT_CBM_CFM: + + /* + * CODEC supplies BCLK and LRC clocks. + * + * The SSC transmit clock is obtained from the BCLK signal on + * on the TK line, and the SSC receive clock is generated from the + * transmit clock. + * + * For single channel data, one sample is transferred on the falling + * edge of the LRC clock. For two channel data, one sample is + * transferred on both edges of the LRC clock. + */ + start_event = channels == 1 + ? AT91_SSC_START_FALLING_RF + : AT91_SSC_START_EDGE_RF; + + rcmr = (( 0 << 24) & AT91_SSC_PERIOD) + | (( 1 << 16) & AT91_SSC_STTDLY) + | (( start_event ) & AT91_SSC_START) + | (( AT91_SSC_CK_RISING ) & AT91_SSC_CKI) + | (( AT91_SSC_CKO_NONE ) & AT91_SSC_CKO) + | (( AT91_SSC_CKS_CLOCK ) & AT91_SSC_CKS); + + rfmr = (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE) + | (( AT91_SSC_FSOS_NONE ) & AT91_SSC_FSOS) + | (( 0 << 16) & AT91_SSC_FSLEN) + | (( 0 << 8) & AT91_SSC_DATNB) + | (( 1 << 7) & AT91_SSC_MSBF) + | (( 0 << 5) & AT91_SSC_LOOP) + | (((bits - 1) << 0) & AT91_SSC_DATALEN); + + tcmr = (( 0 << 24) & AT91_SSC_PERIOD) + | (( 1 << 16) & AT91_SSC_STTDLY) + | (( start_event ) & AT91_SSC_START) + | (( AT91_SSC_CKI_FALLING ) & AT91_SSC_CKI) + | (( AT91_SSC_CKO_NONE ) & AT91_SSC_CKO) + | (( AT91_SSC_CKS_PIN ) & AT91_SSC_CKS); + + tfmr = (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE) + | (( 0 << 23) & AT91_SSC_FSDEN) + | (( AT91_SSC_FSOS_NONE ) & AT91_SSC_FSOS) + | (( 0 << 16) & AT91_SSC_FSLEN) + | (( 0 << 8) & AT91_SSC_DATNB) + | (( 1 << 7) & AT91_SSC_MSBF) + | (( 0 << 5) & AT91_SSC_DATDEF) + | (((bits - 1) << 0) & AT91_SSC_DATALEN); + break; + + case SND_SOC_DAIFMT_CBS_CFM: + case SND_SOC_DAIFMT_CBM_CFS: + default: + printk(KERN_WARNING "at91-i2s: unsupported DAI format 0x%x.\n", + ssc_p->daifmt); + return -EINVAL; + break; + } + DBG("RCMR=%08x RFMR=%08x TCMR=%08x TFMR=%08x\n", rcmr, rfmr, tcmr, tfmr); + + if (!ssc_p->initialized) { + /* Enable PMC peripheral clock for this SSC */ DBG("Starting pid %d clock\n", ssc_p->ssc.pid); at91_sys_write(AT91_PMC_PCER, 1<<ssc_p->ssc.pid); - /* Reset the SSC */ + /* Reset the SSC and its PDC registers */ at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR, AT91_SSC_SWRST); at91_ssc_write(ssc_p->ssc.base + AT91_PDC_RPR, 0); @@ -491,97 +517,30 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream, at91_ssc_write(ssc_p->ssc.base + AT91_PDC_TNPR, 0); at91_ssc_write(ssc_p->ssc.base + AT91_PDC_TNCR, 0); - div = rtd->cpu_dai->dai_runtime.priv >> 16; - period = rtd->cpu_dai->dai_runtime.priv & 0xffff; - - mck_clk = clk_get(NULL, "mck"); - - DBG("mck %lu fsbd %u bfs %llu bfs_real %u bclk %lu div %u period %u\n", - clk_get_rate(mck_clk), - SND_SOC_FSBD(6), - rtd->cpu_dai->dai_runtime.bfs, - SND_SOC_FSBD_REAL(rtd->cpu_dai->dai_runtime.bfs), - clk_get_rate(mck_clk) / (2 * div), - div, - period); - - clk_put(mck_clk); - - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CMR, div); - - /* - * Setup the TFMR and RFMR for the proper data format. - */ - tfmr = - (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE) - | (( 0 << 23) & AT91_SSC_FSDEN) - | (( AT91_SSC_FSOS_NEGATIVE ) & AT91_SSC_FSOS) - | (((bits - 1) << 16) & AT91_SSC_FSLEN) - | (((channels - 1) << 8) & AT91_SSC_DATNB) - | (( 1 << 7) & AT91_SSC_MSBF) - | (( 0 << 5) & AT91_SSC_DATDEF) - | (((bits - 1) << 0) & AT91_SSC_DATALEN); - DBG("SSC_TFMR=0x%08x\n", tfmr); - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TFMR, tfmr); - - rfmr = - (( AT91_SSC_FSEDGE_POSITIVE ) & AT91_SSC_FSEDGE) - | (( AT91_SSC_FSOS_NONE ) & AT91_SSC_FSOS) - | (( 0 << 16) & AT91_SSC_FSLEN) - | (((channels - 1) << 8) & AT91_SSC_DATNB) - | (( 1 << 7) & AT91_SSC_MSBF) - | (( 0 << 5) & AT91_SSC_LOOP) - | (((bits - 1) << 0) & AT91_SSC_DATALEN); - - DBG("SSC_RFMR=0x%08x\n", rfmr); - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RFMR, rfmr); - - /* - * Setup the TCMR and RCMR to generate the proper BCLK - * and LRC signals. - */ - tcmr = - (( period << 24) & AT91_SSC_PERIOD) - | (( 1 << 16) & AT91_SSC_STTDLY) - | (( AT91_SSC_START_FALLING_RF ) & AT91_SSC_START) - | (( AT91_SSC_CKI_FALLING ) & AT91_SSC_CKI) - | (( AT91_SSC_CKO_CONTINUOUS ) & AT91_SSC_CKO) - | (( AT91_SSC_CKS_DIV ) & AT91_SSC_CKS); - - DBG("SSC_TCMR=0x%08x\n", tcmr); - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TCMR, tcmr); - - rcmr = - (( 0 << 24) & AT91_SSC_PERIOD) - | (( 1 << 16) & AT91_SSC_STTDLY) - | (( AT91_SSC_START_TX_RX ) & AT91_SSC_START) - | (( AT91_SSC_CK_RISING ) & AT91_SSC_CKI) - | (( AT91_SSC_CKO_NONE ) & AT91_SSC_CKO) - | (( AT91_SSC_CKS_CLOCK ) & AT91_SSC_CKS); - - DBG("SSC_RCMR=0x%08x\n", rcmr); - at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, rcmr); - if ((ret = request_irq(ssc_p->ssc.pid, at91_i2s_interrupt, 0, ssc_p->name, ssc_p)) < 0) { printk(KERN_WARNING "at91-i2s: request_irq failure\n"); + + DBG("Stopping pid %d clock\n", ssc_p->ssc.pid); + at91_sys_write(AT91_PMC_PCER, 1<<ssc_p->ssc.pid); return ret; } - /* - * Save the current substream parameters in order to check - * that the substream in the opposite direction uses the - * same parameters. - */ - ssc_p->pcmfmt = pcmfmt; - ssc_p->rate = rate; ssc_p->initialized = 1; - - DBG("hw_params: SSC initialized\n"); } - up(ssc_p->mutex); + /* set SSC clock mode register */ + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CMR, ssc_p->cmr_div); + + /* set receive clock mode and format */ + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, rcmr); + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RFMR, rfmr); + + /* set transmit clock mode and format */ + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TCMR, tcmr); + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TFMR, tfmr); + DBG("hw_params: SSC initialized\n"); return 0; } @@ -589,39 +548,112 @@ static int at91_i2s_hw_params(struct snd_pcm_substream *substream, static int at91_i2s_prepare(struct snd_pcm_substream *substream) { struct snd_soc_pcm_runtime *rtd = substream->private_data; - struct at91_pcm_dma_params *dma_params = rtd->cpu_dai->dma_data; + struct at91_ssc_info *ssc_p = &ssc_info[rtd->dai->cpu_dai->id]; + struct at91_pcm_dma_params *dma_params; + int dir; + + dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1; + dma_params = ssc_p->dma_params[dir]; at91_ssc_write(dma_params->ssc_base + AT91_SSC_CR, dma_params->mask->ssc_enable); - DBG("%s enabled SSC_SR=0x%08lx\n", - substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? "transmit" : "receive", - at91_ssc_read(ssc_info[rtd->cpu_dai->id].ssc.base + AT91_SSC_SR)); + DBG("%s enabled SSC_SR=0x%08lx\n", dir ? "receive" : "transmit", + at91_ssc_read(dma_params->ssc_base + AT91_SSC_SR)); return 0; } +#ifdef CONFIG_PM +static int at91_i2s_suspend(struct platform_device *pdev, + struct snd_soc_cpu_dai *cpu_dai) +{ + struct at91_ssc_info *ssc_p; + + if(!cpu_dai->active) + return 0; + + ssc_p = &ssc_info[cpu_dai->id]; + + /* Save the status register before disabling transmit and receive. */ + ssc_p->ssc_state.ssc_sr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_SR); + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR, + AT91_SSC_TXDIS | AT91_SSC_RXDIS); + + /* Save the current interrupt mask, then disable unmasked interrupts. */ + ssc_p->ssc_state.ssc_imr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_IMR); + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_IDR, ssc_p->ssc_state.ssc_imr); + + ssc_p->ssc_state.ssc_cmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_CMR); + ssc_p->ssc_state.ssc_rcmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RCMR); + ssc_p->ssc_state.ssc_rfmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_RFMR); + ssc_p->ssc_state.ssc_tcmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_TCMR); + ssc_p->ssc_state.ssc_tfmr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_TFMR); + + return 0; +} + +static int at91_i2s_resume(struct platform_device *pdev, + struct snd_soc_cpu_dai *cpu_dai) +{ + struct at91_ssc_info *ssc_p; + + if(!cpu_dai->active) + return 0; + + ssc_p = &ssc_info[cpu_dai->id]; + + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TFMR, ssc_p->ssc_state.ssc_tfmr); + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_TCMR, ssc_p->ssc_state.ssc_tcmr); + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RFMR, ssc_p->ssc_state.ssc_rfmr); + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_RCMR, ssc_p->ssc_state.ssc_rcmr); + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CMR, ssc_p->ssc_state.ssc_cmr); + + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_IER, ssc_p->ssc_state.ssc_imr); + + at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR, + ((ssc_p->ssc_state.ssc_sr & AT91_SSC_RXENA) ? AT91_SSC_RXEN : 0) | + ((ssc_p->ssc_state.ssc_sr & AT91_SSC_TXENA) ? AT91_SSC_TXEN : 0)); + + return 0; +} + +#else +#define at91_i2s_suspend NULL +#define at91_i2s_resume NULL +#endif + +#define AT91_I2S_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ + SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |\ + SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\ + SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\ + SNDRV_PCM_RATE_96000) + struct snd_soc_cpu_dai at91_i2s_dai[NUM_SSC_DEVICES] = { { .name = "at91_ssc0/i2s", .id = 0, .type = SND_SOC_DAI_I2S, .suspend = at91_i2s_suspend, .resume = at91_i2s_resume, - .config_sysclk = at91_i2s_config_sysclk, .playback = { .channels_min = 1, - .channels_max = 2,}, + .channels_max = 2, + .rates = AT91_I2S_RATES, + .formats = SNDRV_PCM_FMTBIT_S16_LE,}, .capture = { .channels_min = 1, - .channels_max = 2,}, + .channels_max = 2, + .rates = AT91_I2S_RATES, + .formats = SNDRV_PCM_FMTBIT_S16_LE,}, .ops = { .startup = at91_i2s_startup, .shutdown = at91_i2s_shutdown, .prepare = at91_i2s_prepare, .hw_params = at91_i2s_hw_params,}, - .caps = { - .mode = &at91_i2s[0], - .num_modes = ARRAY_SIZE(at91_i2s),}, + .dai_ops = { + .set_sysclk = at91_i2s_set_dai_sysclk, + .set_fmt = at91_i2s_set_dai_fmt, + .set_clkdiv = at91_i2s_set_dai_clkdiv,}, .private_data = &ssc_info[0].ssc, }, #if NUM_SSC_DEVICES == 3 @@ -630,21 +662,25 @@ struct snd_soc_cpu_dai at91_i2s_dai[NUM_SSC_DEVICES] = { .type = SND_SOC_DAI_I2S, .suspend = at91_i2s_suspend, .resume = at91_i2s_resume, - .config_sysclk = at91_i2s_config_sysclk, .playback = { .channels_min = 1, - .channels_max = 2,}, + .channels_max = 2, + .rates = AT91_I2S_RATES, + .formats = SNDRV_PCM_FMTBIT_S16_LE,}, .capture = { .channels_min = 1, - .channels_max = 2,}, + .channels_max = 2, + .rates = AT91_I2S_RATES, + .formats = SNDRV_PCM_FMTBIT_S16_LE,}, .ops = { .startup = at91_i2s_startup, .shutdown = at91_i2s_shutdown, .prepare = at91_i2s_prepare, .hw_params = at91_i2s_hw_params,}, - .caps = { - .mode = &at91_i2s[0], - .num_modes = ARRAY_SIZE(at91_i2s),}, + .dai_ops = { + .set_sysclk = at91_i2s_set_dai_sysclk, + .set_fmt = at91_i2s_set_dai_fmt, + .set_clkdiv = at91_i2s_set_dai_clkdiv,}, .private_data = &ssc_info[1].ssc, }, { .name = "at91_ssc2/i2s", @@ -652,21 +688,25 @@ struct snd_soc_cpu_dai at91_i2s_dai[NUM_SSC_DEVICES] = { .type = SND_SOC_DAI_I2S, .suspend = at91_i2s_suspend, .resume = at91_i2s_resume, - .config_sysclk = at91_i2s_config_sysclk, .playback = { .channels_min = 1, - .channels_max = 2,}, + .channels_max = 2, + .rates = AT91_I2S_RATES, + .formats = SNDRV_PCM_FMTBIT_S16_LE,}, .capture = { .channels_min = 1, - .channels_max = 2,}, + .channels_max = 2, + .rates = AT91_I2S_RATES, + .formats = SNDRV_PCM_FMTBIT_S16_LE,}, .ops = { .startup = at91_i2s_startup, .shutdown = at91_i2s_shutdown, .prepare = at91_i2s_prepare, .hw_params = at91_i2s_hw_params,}, - .caps = { - .mode = &at91_i2s[0], - .num_modes = ARRAY_SIZE(at91_i2s),}, + .dai_ops = { + .set_sysclk = at91_i2s_set_dai_sysclk, + .set_fmt = at91_i2s_set_dai_fmt, + .set_clkdiv = at91_i2s_set_dai_clkdiv,}, .private_data = &ssc_info[2].ssc, }, #endif diff --git a/sound/soc/at91/at91-i2s.h b/sound/soc/at91/at91-i2s.h new file mode 100644 index 0000000..f8a875b --- /dev/null +++ b/sound/soc/at91/at91-i2s.h @@ -0,0 +1,27 @@ +/* + * at91-i2s.h - ALSA I2S interface for the Atmel AT91 SoC + * + * Author: Frank Mandarino <fmandarino@endrelia.com> + * Endrelia Technologies Inc. + * Created: Jan 9, 2007 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef _AT91_I2S_H +#define _AT91_I2S_H + +/* I2S system clock ids */ +#define AT91_SYSCLK_MCK 0 /* SSC uses AT91 MCK as system clock */ + +/* I2S divider ids */ +#define AT91SSC_CMR_DIV 0 /* MCK divider for BCLK */ +#define AT91SSC_TCMR_PERIOD 1 /* BCLK divider for transmit FS */ +#define AT91SSC_RCMR_PERIOD 2 /* BCLK divider for receive FS */ + +extern struct snd_soc_cpu_dai at91_i2s_dai[]; + +#endif /* _AT91_I2S_H */ + |