/* * at91-i2s.c -- ALSA SoC I2S Audio Layer Platform driver * * Author: Frank Mandarino * Endrelia Technologies Inc. * * Based on pxa2xx Platform drivers by * Liam Girdwood * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * Revision history * 3rd Mar 2006 Initial version. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "at91-pcm.h" #if 0 #define DBG(x...) printk(KERN_DEBUG "at91-i2s:" x) #else #define DBG(x...) #endif #if defined(CONFIG_ARCH_AT91SAM9260) #define NUM_SSC_DEVICES 1 #else #define NUM_SSC_DEVICES 3 #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. */ static struct at91_pdc_regs pdc_tx_reg = { .xpr = AT91_PDC_TPR, .xcr = AT91_PDC_TCR, .xnpr = AT91_PDC_TNPR, .xncr = AT91_PDC_TNCR, }; static struct at91_pdc_regs pdc_rx_reg = { .xpr = AT91_PDC_RPR, .xcr = AT91_PDC_RCR, .xnpr = AT91_PDC_RNPR, .xncr = AT91_PDC_RNCR, }; /* * SSC & PDC status bits for transmit and receive. */ static struct at91_ssc_mask ssc_tx_mask = { .ssc_enable = AT91_SSC_TXEN, .ssc_disable = AT91_SSC_TXDIS, .ssc_endx = AT91_SSC_ENDTX, .ssc_endbuf = AT91_SSC_TXBUFE, .pdc_enable = AT91_PDC_TXTEN, .pdc_disable = AT91_PDC_TXTDIS, }; static struct at91_ssc_mask ssc_rx_mask = { .ssc_enable = AT91_SSC_RXEN, .ssc_disable = AT91_SSC_RXDIS, .ssc_endx = AT91_SSC_ENDRX, .ssc_endbuf = AT91_SSC_RXBUFF, .pdc_enable = AT91_PDC_RXTEN, .pdc_disable = AT91_PDC_RXTDIS, }; /* * DMA parameters. */ static struct at91_pcm_dma_params ssc_dma_params[NUM_SSC_DEVICES][2] = { {{ .name = "SSC0/I2S PCM Stereo out", .pdc = &pdc_tx_reg, .mask = &ssc_tx_mask, }, { .name = "SSC0/I2S PCM Stereo in", .pdc = &pdc_rx_reg, .mask = &ssc_rx_mask, }}, #if NUM_SSC_DEVICES == 3 {{ .name = "SSC1/I2S PCM Stereo out", .pdc = &pdc_tx_reg, .mask = &ssc_tx_mask, }, { .name = "SSC1/I2S PCM Stereo in", .pdc = &pdc_rx_reg, .mask = &ssc_rx_mask, }}, {{ .name = "SSC2/I2S PCM Stereo out", .pdc = &pdc_tx_reg, .mask = &ssc_tx_mask, }, { .name = "SSC1/I2S PCM Stereo in", .pdc = &pdc_rx_reg, .mask = &ssc_rx_mask, }}, #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; u32 ssc_rfmr; u32 ssc_tcmr; u32 ssc_tfmr; u32 ssc_sr; 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; struct at91_pcm_dma_params *dma_params[2]; struct at91_ssc_state ssc_state; } ssc_info[NUM_SSC_DEVICES] = { { .name = "ssc0", .lock = SPIN_LOCK_UNLOCKED, .dir_mask = 0, .mutex = &ssc0_mutex, .initialized = 0, }, #if NUM_SSC_DEVICES == 3 { .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 irqreturn_t at91_i2s_interrupt(int irq, void *dev_id) { struct at91_ssc_info *ssc_p = dev_id; struct at91_pcm_dma_params *dma_params; u32 ssc_sr; int i; ssc_sr = at91_ssc_read(ssc_p->ssc.base + AT91_SSC_SR) & at91_ssc_read(ssc_p->ssc.base + AT91_SSC_IMR); /* * Loop through the substreams attached to this SSC. If * a DMA-related interrupt occurred on that substream, call * the DMA interrupt handler function, if one has been * registered in the dma_params structure by the PCM driver. */ for (i = 0; i < ARRAY_SIZE(ssc_p->dma_params); i++) { dma_params = ssc_p->dma_params[i]; if (dma_params != NULL && dma_params->dma_intr_handler != NULL && (ssc_sr & (dma_params->mask->ssc_endx | dma_params->mask->ssc_endbuf))) dma_params->dma_intr_handler(ssc_sr, dma_params->substream); } return IRQ_HANDLED; } 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]; int dir_mask; DBG("i2s_startup: SSC_SR=0x%08lx\n", at91_ssc_read(ssc_p->ssc.base + AT91_SSC_SR)); dir_mask = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0x1 : 0x2; spin_lock_irq(&ssc_p->lock); if (ssc_p->dir_mask & dir_mask) { spin_unlock_irq(&ssc_p->lock); return -EBUSY; } 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; } 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; int dir, dir_mask; dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1; if (dma_params != NULL) { at91_ssc_write(dma_params->ssc_base + AT91_SSC_CR, dma_params->mask->ssc_disable); DBG("%s disabled SSC_SR=0x%08lx\n", (dir ? "receive" : "transmit"), at91_ssc_read(ssc_p->ssc.base + AT91_SSC_SR)); dma_params->ssc_base = NULL; dma_params->substream = NULL; ssc_p->dma_params[dir] = NULL; } dir_mask = 1 << dir; spin_lock_irq(&ssc_p->lock); ssc_p->dir_mask &= ~dir_mask; if (!ssc_p->dir_mask) { /* Shutdown the SSC clock. */ DBG("Stopping pid %d clock\n", ssc_p->ssc.pid); at91_sys_write(AT91_PMC_PCDR, 1<ssc.pid); if (ssc_p->initialized) free_irq(ssc_p->ssc.pid, ssc_p); /* 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; } spin_unlock_irq(&ssc_p->lock); } #ifdef CONFIG_PM static int at91_i2s_suspend(struct platform_device *pdev, struct snd_soc_cpu_dai *dai) { 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); return 0; } static int at91_i2s_resume(struct platform_device *pdev, struct snd_soc_cpu_dai *dai) { struct at91_ssc_info *ssc_p; u32 cr_mask; if(!dai->active) return 0; ssc_p = &ssc_info[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)); 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) { /* Currently, there is only support for USB (12Mhz) mode */ if (clk != 12000000) return 0; return 12000000; } 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; 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; int ret; /* * Currently, there is only one set of dma params for * each direction. If more are added, this code will * have to be changed to select the proper set. */ dir = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1; dma_params = &ssc_dma_params[id][dir]; dma_params->ssc_base = ssc_p->ssc.base; 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); 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; } /* Don't allow both SSC substreams to initialize at the same time. */ down(ssc_p->mutex); /* * If this SSC is alreadly initialized, then this substream must use * the same format and rate. */ 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 { /* 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.pid); /* Reset the SSC */ at91_ssc_write(ssc_p->ssc.base + AT91_SSC_CR, AT91_SSC_SWRST); at91_ssc_write(ssc_p->ssc.base + AT91_PDC_RPR, 0); at91_ssc_write(ssc_p->ssc.base + AT91_PDC_RCR, 0); at91_ssc_write(ssc_p->ssc.base + AT91_PDC_RNPR, 0); at91_ssc_write(ssc_p->ssc.base + AT91_PDC_RNCR, 0); at91_ssc_write(ssc_p->ssc.base + AT91_PDC_TPR, 0); at91_ssc_write(ssc_p->ssc.base + AT91_PDC_TCR, 0); 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"); 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); return 0; } 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; 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)); return 0; } 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,}, .capture = { .channels_min = 1, .channels_max = 2,}, .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),}, .private_data = &ssc_info[0].ssc, }, #if NUM_SSC_DEVICES == 3 { .name = "at91_ssc1/i2s", .id = 1, .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,}, .capture = { .channels_min = 1, .channels_max = 2,}, .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),}, .private_data = &ssc_info[1].ssc, }, { .name = "at91_ssc2/i2s", .id = 2, .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,}, .capture = { .channels_min = 1, .channels_max = 2,}, .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),}, .private_data = &ssc_info[2].ssc, }, #endif }; EXPORT_SYMBOL_GPL(at91_i2s_dai); /* Module information */ MODULE_AUTHOR("Frank Mandarino, fmandarino@endrelia.com, www.endrelia.com"); MODULE_DESCRIPTION("AT91 I2S ASoC Interface"); MODULE_LICENSE("GPL");