diff options
Diffstat (limited to 'sound/soc/fsl/fsl_esai.c')
| -rw-r--r-- | sound/soc/fsl/fsl_esai.c | 815 |
1 files changed, 815 insertions, 0 deletions
diff --git a/sound/soc/fsl/fsl_esai.c b/sound/soc/fsl/fsl_esai.c new file mode 100644 index 000000000000..d0c72ed261e7 --- /dev/null +++ b/sound/soc/fsl/fsl_esai.c @@ -0,0 +1,815 @@ +/* + * Freescale ESAI ALSA SoC Digital Audio Interface (DAI) driver + * + * Copyright (C) 2014 Freescale Semiconductor, Inc. + * + * This file is licensed under the terms of the GNU General Public License + * version 2. This program is licensed "as is" without any warranty of any + * kind, whether express or implied. + */ + +#include <linux/clk.h> +#include <linux/dmaengine.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <sound/dmaengine_pcm.h> +#include <sound/pcm_params.h> + +#include "fsl_esai.h" +#include "imx-pcm.h" + +#define FSL_ESAI_RATES SNDRV_PCM_RATE_8000_192000 +#define FSL_ESAI_FORMATS (SNDRV_PCM_FMTBIT_S8 | \ + SNDRV_PCM_FMTBIT_S16_LE | \ + SNDRV_PCM_FMTBIT_S20_3LE | \ + SNDRV_PCM_FMTBIT_S24_LE) + +/** + * fsl_esai: ESAI private data + * + * @dma_params_rx: DMA parameters for receive channel + * @dma_params_tx: DMA parameters for transmit channel + * @pdev: platform device pointer + * @regmap: regmap handler + * @coreclk: clock source to access register + * @extalclk: esai clock source to derive HCK, SCK and FS + * @fsysclk: system clock source to derive HCK, SCK and FS + * @fifo_depth: depth of tx/rx FIFO + * @slot_width: width of each DAI slot + * @hck_rate: clock rate of desired HCKx clock + * @sck_div: if using PSR/PM dividers for SCKx clock + * @slave_mode: if fully using DAI slave mode + * @synchronous: if using tx/rx synchronous mode + * @name: driver name + */ +struct fsl_esai { + struct snd_dmaengine_dai_dma_data dma_params_rx; + struct snd_dmaengine_dai_dma_data dma_params_tx; + struct platform_device *pdev; + struct regmap *regmap; + struct clk *coreclk; + struct clk *extalclk; + struct clk *fsysclk; + u32 fifo_depth; + u32 slot_width; + u32 hck_rate[2]; + bool sck_div[2]; + bool slave_mode; + bool synchronous; + char name[32]; +}; + +static irqreturn_t esai_isr(int irq, void *devid) +{ + struct fsl_esai *esai_priv = (struct fsl_esai *)devid; + struct platform_device *pdev = esai_priv->pdev; + u32 esr; + + regmap_read(esai_priv->regmap, REG_ESAI_ESR, &esr); + + if (esr & ESAI_ESR_TINIT_MASK) + dev_dbg(&pdev->dev, "isr: Transmition Initialized\n"); + + if (esr & ESAI_ESR_RFF_MASK) + dev_warn(&pdev->dev, "isr: Receiving overrun\n"); + + if (esr & ESAI_ESR_TFE_MASK) + dev_warn(&pdev->dev, "isr: Transmition underrun\n"); + + if (esr & ESAI_ESR_TLS_MASK) + dev_dbg(&pdev->dev, "isr: Just transmitted the last slot\n"); + + if (esr & ESAI_ESR_TDE_MASK) + dev_dbg(&pdev->dev, "isr: Transmition data exception\n"); + + if (esr & ESAI_ESR_TED_MASK) + dev_dbg(&pdev->dev, "isr: Transmitting even slots\n"); + + if (esr & ESAI_ESR_TD_MASK) + dev_dbg(&pdev->dev, "isr: Transmitting data\n"); + + if (esr & ESAI_ESR_RLS_MASK) + dev_dbg(&pdev->dev, "isr: Just received the last slot\n"); + + if (esr & ESAI_ESR_RDE_MASK) + dev_dbg(&pdev->dev, "isr: Receiving data exception\n"); + + if (esr & ESAI_ESR_RED_MASK) + dev_dbg(&pdev->dev, "isr: Receiving even slots\n"); + + if (esr & ESAI_ESR_RD_MASK) + dev_dbg(&pdev->dev, "isr: Receiving data\n"); + + return IRQ_HANDLED; +} + +/** + * This function is used to calculate the divisors of psr, pm, fp and it is + * supposed to be called in set_dai_sysclk() and set_bclk(). + * + * @ratio: desired overall ratio for the paticipating dividers + * @usefp: for HCK setting, there is no need to set fp divider + * @fp: bypass other dividers by setting fp directly if fp != 0 + * @tx: current setting is for playback or capture + */ +static int fsl_esai_divisor_cal(struct snd_soc_dai *dai, bool tx, u32 ratio, + bool usefp, u32 fp) +{ + struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); + u32 psr, pm = 999, maxfp, prod, sub, savesub, i, j; + + maxfp = usefp ? 16 : 1; + + if (usefp && fp) + goto out_fp; + + if (ratio > 2 * 8 * 256 * maxfp || ratio < 2) { + dev_err(dai->dev, "the ratio is out of range (2 ~ %d)\n", + 2 * 8 * 256 * maxfp); + return -EINVAL; + } else if (ratio % 2) { + dev_err(dai->dev, "the raio must be even if using upper divider\n"); + return -EINVAL; + } + + ratio /= 2; + + psr = ratio <= 256 * maxfp ? ESAI_xCCR_xPSR_BYPASS : ESAI_xCCR_xPSR_DIV8; + + /* Set the max fluctuation -- 0.1% of the max devisor */ + savesub = (psr ? 1 : 8) * 256 * maxfp / 1000; + + /* Find the best value for PM */ + for (i = 1; i <= 256; i++) { + for (j = 1; j <= maxfp; j++) { + /* PSR (1 or 8) * PM (1 ~ 256) * FP (1 ~ 16) */ + prod = (psr ? 1 : 8) * i * j; + + if (prod == ratio) + sub = 0; + else if (prod / ratio == 1) + sub = prod - ratio; + else if (ratio / prod == 1) + sub = ratio - prod; + else + continue; + + /* Calculate the fraction */ + sub = sub * 1000 / ratio; + if (sub < savesub) { + savesub = sub; + pm = i; + fp = j; + } + + /* We are lucky */ + if (savesub == 0) + goto out; + } + } + + if (pm == 999) { + dev_err(dai->dev, "failed to calculate proper divisors\n"); + return -EINVAL; + } + +out: + regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx), + ESAI_xCCR_xPSR_MASK | ESAI_xCCR_xPM_MASK, + psr | ESAI_xCCR_xPM(pm)); + +out_fp: + /* Bypass fp if not being required */ + if (maxfp <= 1) + return 0; + + regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx), + ESAI_xCCR_xFP_MASK, ESAI_xCCR_xFP(fp)); + + return 0; +} + +/** + * This function mainly configures the clock frequency of MCLK (HCKT/HCKR) + * + * @Parameters: + * clk_id: The clock source of HCKT/HCKR + * (Input from outside; output from inside, FSYS or EXTAL) + * freq: The required clock rate of HCKT/HCKR + * dir: The clock direction of HCKT/HCKR + * + * Note: If the direction is input, we do not care about clk_id. + */ +static int fsl_esai_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id, + unsigned int freq, int dir) +{ + struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); + struct clk *clksrc = esai_priv->extalclk; + bool tx = clk_id <= ESAI_HCKT_EXTAL; + bool in = dir == SND_SOC_CLOCK_IN; + u32 ret, ratio, ecr = 0; + unsigned long clk_rate; + + /* sck_div can be only bypassed if ETO/ERO=0 and SNC_SOC_CLOCK_OUT */ + esai_priv->sck_div[tx] = true; + + /* Set the direction of HCKT/HCKR pins */ + regmap_update_bits(esai_priv->regmap, REG_ESAI_xCCR(tx), + ESAI_xCCR_xHCKD, in ? 0 : ESAI_xCCR_xHCKD); + + if (in) + goto out; + + switch (clk_id) { + case ESAI_HCKT_FSYS: + case ESAI_HCKR_FSYS: + clksrc = esai_priv->fsysclk; + break; + case ESAI_HCKT_EXTAL: + ecr |= ESAI_ECR_ETI; + case ESAI_HCKR_EXTAL: + ecr |= ESAI_ECR_ERI; + break; + default: + return -EINVAL; + } + + if (IS_ERR(clksrc)) { + dev_err(dai->dev, "no assigned %s clock\n", + clk_id % 2 ? "extal" : "fsys"); + return PTR_ERR(clksrc); + } + clk_rate = clk_get_rate(clksrc); + + ratio = clk_rate / freq; + if (ratio * freq > clk_rate) + ret = ratio * freq - clk_rate; + else if (ratio * freq < clk_rate) + ret = clk_rate - ratio * freq; + else + ret = 0; + + /* Block if clock source can not be divided into the required rate */ + if (ret != 0 && clk_rate / ret < 1000) { + dev_err(dai->dev, "failed to derive required HCK%c rate\n", + tx ? 'T' : 'R'); + return -EINVAL; + } + + if (ratio == 1) { + /* Bypass all the dividers if not being needed */ + ecr |= tx ? ESAI_ECR_ETO : ESAI_ECR_ERO; + goto out; + } + + ret = fsl_esai_divisor_cal(dai, tx, ratio, false, 0); + if (ret) + return ret; + + esai_priv->sck_div[tx] = false; + +out: + esai_priv->hck_rate[tx] = freq; + + regmap_update_bits(esai_priv->regmap, REG_ESAI_ECR, + tx ? ESAI_ECR_ETI | ESAI_ECR_ETO : + ESAI_ECR_ERI | ESAI_ECR_ERO, ecr); + + return 0; +} + +/** + * This function configures the related dividers according to the bclk rate + */ +static int fsl_esai_set_bclk(struct snd_soc_dai *dai, bool tx, u32 freq) +{ + struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); + u32 hck_rate = esai_priv->hck_rate[tx]; + u32 sub, ratio = hck_rate / freq; + + /* Don't apply for fully slave mode*/ + if (esai_priv->slave_mode) + return 0; + + if (ratio * freq > hck_rate) + sub = ratio * freq - hck_rate; + else if (ratio * freq < hck_rate) + sub = hck_rate - ratio * freq; + else + sub = 0; + + /* Block if clock source can not be divided into the required rate */ + if (sub != 0 && hck_rate / sub < 1000) { + dev_err(dai->dev, "failed to derive required SCK%c rate\n", + tx ? 'T' : 'R'); + return -EINVAL; + } + + if (esai_priv->sck_div[tx] && (ratio > 16 || ratio == 0)) { + dev_err(dai->dev, "the ratio is out of range (1 ~ 16)\n"); + return -EINVAL; + } + + return fsl_esai_divisor_cal(dai, tx, ratio, true, + esai_priv->sck_div[tx] ? 0 : ratio); +} + +static int fsl_esai_set_dai_tdm_slot(struct snd_soc_dai *dai, u32 tx_mask, + u32 rx_mask, int slots, int slot_width) +{ + struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); + + regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR, + ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(slots)); + + regmap_update_bits(esai_priv->regmap, REG_ESAI_TSMA, + ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(tx_mask)); + regmap_update_bits(esai_priv->regmap, REG_ESAI_TSMB, + ESAI_xSMA_xS_MASK, ESAI_xSMB_xS(tx_mask)); + + regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR, + ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(slots)); + + regmap_update_bits(esai_priv->regmap, REG_ESAI_RSMA, + ESAI_xSMA_xS_MASK, ESAI_xSMA_xS(rx_mask)); + regmap_update_bits(esai_priv->regmap, REG_ESAI_RSMB, + ESAI_xSMA_xS_MASK, ESAI_xSMB_xS(rx_mask)); + + esai_priv->slot_width = slot_width; + + return 0; +} + +static int fsl_esai_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt) +{ + struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); + u32 xcr = 0, xccr = 0, mask; + + /* DAI mode */ + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + /* Data on rising edge of bclk, frame low, 1clk before data */ + xcr |= ESAI_xCR_xFSR; + xccr |= ESAI_xCCR_xFSP | ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP; + break; + case SND_SOC_DAIFMT_LEFT_J: + /* Data on rising edge of bclk, frame high */ + xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP; + break; + case SND_SOC_DAIFMT_RIGHT_J: + /* Data on rising edge of bclk, frame high, right aligned */ + xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCR_xWA; + break; + case SND_SOC_DAIFMT_DSP_A: + /* Data on rising edge of bclk, frame high, 1clk before data */ + xcr |= ESAI_xCR_xFSL | ESAI_xCR_xFSR; + xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP; + break; + case SND_SOC_DAIFMT_DSP_B: + /* Data on rising edge of bclk, frame high */ + xcr |= ESAI_xCR_xFSL; + xccr |= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP; + break; + default: + return -EINVAL; + } + + /* DAI clock inversion */ + switch (fmt & SND_SOC_DAIFMT_INV_MASK) { + case SND_SOC_DAIFMT_NB_NF: + /* Nothing to do for both normal cases */ + break; + case SND_SOC_DAIFMT_IB_NF: + /* Invert bit clock */ + xccr ^= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP; + break; + case SND_SOC_DAIFMT_NB_IF: + /* Invert frame clock */ + xccr ^= ESAI_xCCR_xFSP; + break; + case SND_SOC_DAIFMT_IB_IF: + /* Invert both clocks */ + xccr ^= ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCCR_xFSP; + break; + default: + return -EINVAL; + } + + esai_priv->slave_mode = false; + + /* DAI clock master masks */ + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBM_CFM: + esai_priv->slave_mode = true; + break; + case SND_SOC_DAIFMT_CBS_CFM: + xccr |= ESAI_xCCR_xCKD; + break; + case SND_SOC_DAIFMT_CBM_CFS: + xccr |= ESAI_xCCR_xFSD; + break; + case SND_SOC_DAIFMT_CBS_CFS: + xccr |= ESAI_xCCR_xFSD | ESAI_xCCR_xCKD; + break; + default: + return -EINVAL; + } + + mask = ESAI_xCR_xFSL | ESAI_xCR_xFSR; + regmap_update_bits(esai_priv->regmap, REG_ESAI_TCR, mask, xcr); + regmap_update_bits(esai_priv->regmap, REG_ESAI_RCR, mask, xcr); + + mask = ESAI_xCCR_xCKP | ESAI_xCCR_xHCKP | ESAI_xCCR_xFSP | + ESAI_xCCR_xFSD | ESAI_xCCR_xCKD | ESAI_xCR_xWA; + regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR, mask, xccr); + regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR, mask, xccr); + + return 0; +} + +static int fsl_esai_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); + + /* + * Some platforms might use the same bit to gate all three or two of + * clocks, so keep all clocks open/close at the same time for safety + */ + clk_prepare_enable(esai_priv->coreclk); + if (!IS_ERR(esai_priv->extalclk)) + clk_prepare_enable(esai_priv->extalclk); + if (!IS_ERR(esai_priv->fsysclk)) + clk_prepare_enable(esai_priv->fsysclk); + + if (!dai->active) { + /* Reset Port C */ + regmap_update_bits(esai_priv->regmap, REG_ESAI_PRRC, + ESAI_PRRC_PDC_MASK, ESAI_PRRC_PDC(ESAI_GPIO)); + regmap_update_bits(esai_priv->regmap, REG_ESAI_PCRC, + ESAI_PCRC_PC_MASK, ESAI_PCRC_PC(ESAI_GPIO)); + + /* Set synchronous mode */ + regmap_update_bits(esai_priv->regmap, REG_ESAI_SAICR, + ESAI_SAICR_SYNC, esai_priv->synchronous ? + ESAI_SAICR_SYNC : 0); + + /* Set a default slot number -- 2 */ + regmap_update_bits(esai_priv->regmap, REG_ESAI_TCCR, + ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(2)); + regmap_update_bits(esai_priv->regmap, REG_ESAI_RCCR, + ESAI_xCCR_xDC_MASK, ESAI_xCCR_xDC(2)); + } + + return 0; +} + +static int fsl_esai_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); + bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; + u32 width = snd_pcm_format_width(params_format(params)); + u32 channels = params_channels(params); + u32 bclk, mask, val, ret; + + bclk = params_rate(params) * esai_priv->slot_width * 2; + + ret = fsl_esai_set_bclk(dai, tx, bclk); + if (ret) + return ret; + + /* Use Normal mode to support monaural audio */ + regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx), + ESAI_xCR_xMOD_MASK, params_channels(params) > 1 ? + ESAI_xCR_xMOD_NETWORK : 0); + + regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx), + ESAI_xFCR_xFR_MASK, ESAI_xFCR_xFR); + + mask = ESAI_xFCR_xFR_MASK | ESAI_xFCR_xWA_MASK | ESAI_xFCR_xFWM_MASK | + (tx ? ESAI_xFCR_TE_MASK | ESAI_xFCR_TIEN : ESAI_xFCR_RE_MASK); + val = ESAI_xFCR_xWA(width) | ESAI_xFCR_xFWM(esai_priv->fifo_depth) | + (tx ? ESAI_xFCR_TE(channels) | ESAI_xFCR_TIEN : ESAI_xFCR_RE(channels)); + + regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx), mask, val); + + mask = ESAI_xCR_xSWS_MASK | (tx ? ESAI_xCR_PADC : 0); + val = ESAI_xCR_xSWS(esai_priv->slot_width, width) | (tx ? ESAI_xCR_PADC : 0); + + regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx), mask, val); + + return 0; +} + +static void fsl_esai_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); + + if (!IS_ERR(esai_priv->fsysclk)) + clk_disable_unprepare(esai_priv->fsysclk); + if (!IS_ERR(esai_priv->extalclk)) + clk_disable_unprepare(esai_priv->extalclk); + clk_disable_unprepare(esai_priv->coreclk); +} + +static int fsl_esai_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *dai) +{ + struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); + bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; + u8 i, channels = substream->runtime->channels; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx), + ESAI_xFCR_xFEN_MASK, ESAI_xFCR_xFEN); + + /* Write initial words reqiured by ESAI as normal procedure */ + for (i = 0; tx && i < channels; i++) + regmap_write(esai_priv->regmap, REG_ESAI_ETDR, 0x0); + + regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx), + tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK, + tx ? ESAI_xCR_TE(channels) : ESAI_xCR_RE(channels)); + break; + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + regmap_update_bits(esai_priv->regmap, REG_ESAI_xCR(tx), + tx ? ESAI_xCR_TE_MASK : ESAI_xCR_RE_MASK, 0); + + /* Disable and reset FIFO */ + regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx), + ESAI_xFCR_xFR | ESAI_xFCR_xFEN, ESAI_xFCR_xFR); + regmap_update_bits(esai_priv->regmap, REG_ESAI_xFCR(tx), + ESAI_xFCR_xFR, 0); + break; + default: + return -EINVAL; + } + + return 0; +} + +static struct snd_soc_dai_ops fsl_esai_dai_ops = { + .startup = fsl_esai_startup, + .shutdown = fsl_esai_shutdown, + .trigger = fsl_esai_trigger, + .hw_params = fsl_esai_hw_params, + .set_sysclk = fsl_esai_set_dai_sysclk, + .set_fmt = fsl_esai_set_dai_fmt, + .set_tdm_slot = fsl_esai_set_dai_tdm_slot, +}; + +static int fsl_esai_dai_probe(struct snd_soc_dai *dai) +{ + struct fsl_esai *esai_priv = snd_soc_dai_get_drvdata(dai); + + snd_soc_dai_init_dma_data(dai, &esai_priv->dma_params_tx, + &esai_priv->dma_params_rx); + + return 0; +} + +static struct snd_soc_dai_driver fsl_esai_dai = { + .probe = fsl_esai_dai_probe, + .playback = { + .channels_min = 1, + .channels_max = 12, + .rates = FSL_ESAI_RATES, + .formats = FSL_ESAI_FORMATS, + }, + .capture = { + .channels_min = 1, + .channels_max = 8, + .rates = FSL_ESAI_RATES, + .formats = FSL_ESAI_FORMATS, + }, + .ops = &fsl_esai_dai_ops, +}; + +static const struct snd_soc_component_driver fsl_esai_component = { + .name = "fsl-esai", +}; + +static bool fsl_esai_readable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case REG_ESAI_ERDR: + case REG_ESAI_ECR: + case REG_ESAI_ESR: + case REG_ESAI_TFCR: + case REG_ESAI_TFSR: + case REG_ESAI_RFCR: + case REG_ESAI_RFSR: + case REG_ESAI_RX0: + case REG_ESAI_RX1: + case REG_ESAI_RX2: + case REG_ESAI_RX3: + case REG_ESAI_SAISR: + case REG_ESAI_SAICR: + case REG_ESAI_TCR: + case REG_ESAI_TCCR: + case REG_ESAI_RCR: + case REG_ESAI_RCCR: + case REG_ESAI_TSMA: + case REG_ESAI_TSMB: + case REG_ESAI_RSMA: + case REG_ESAI_RSMB: + case REG_ESAI_PRRC: + case REG_ESAI_PCRC: + return true; + default: + return false; + } +} + +static bool fsl_esai_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case REG_ESAI_ETDR: + case REG_ESAI_ECR: + case REG_ESAI_TFCR: + case REG_ESAI_RFCR: + case REG_ESAI_TX0: + case REG_ESAI_TX1: + case REG_ESAI_TX2: + case REG_ESAI_TX3: + case REG_ESAI_TX4: + case REG_ESAI_TX5: + case REG_ESAI_TSR: + case REG_ESAI_SAICR: + case REG_ESAI_TCR: + case REG_ESAI_TCCR: + case REG_ESAI_RCR: + case REG_ESAI_RCCR: + case REG_ESAI_TSMA: + case REG_ESAI_TSMB: + case REG_ESAI_RSMA: + case REG_ESAI_RSMB: + case REG_ESAI_PRRC: + case REG_ESAI_PCRC: + return true; + default: + return false; + } +} + +static const struct regmap_config fsl_esai_regmap_config = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + + .max_register = REG_ESAI_PCRC, + .readable_reg = fsl_esai_readable_reg, + .writeable_reg = fsl_esai_writeable_reg, +}; + +static int fsl_esai_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct fsl_esai *esai_priv; + struct resource *res; + const uint32_t *iprop; + void __iomem *regs; + int irq, ret; + + esai_priv = devm_kzalloc(&pdev->dev, sizeof(*esai_priv), GFP_KERNEL); + if (!esai_priv) + return -ENOMEM; + + esai_priv->pdev = pdev; + strcpy(esai_priv->name, np->name); + + /* Get the addresses and IRQ */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + regs = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(regs)) + return PTR_ERR(regs); + + esai_priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev, + "core", regs, &fsl_esai_regmap_config); + if (IS_ERR(esai_priv->regmap)) { + dev_err(&pdev->dev, "failed to init regmap: %ld\n", + PTR_ERR(esai_priv->regmap)); + return PTR_ERR(esai_priv->regmap); + } + + esai_priv->coreclk = devm_clk_get(&pdev->dev, "core"); + if (IS_ERR(esai_priv->coreclk)) { + dev_err(&pdev->dev, "failed to get core clock: %ld\n", + PTR_ERR(esai_priv->coreclk)); + return PTR_ERR(esai_priv->coreclk); + } + + esai_priv->extalclk = devm_clk_get(&pdev->dev, "extal"); + if (IS_ERR(esai_priv->extalclk)) + dev_warn(&pdev->dev, "failed to get extal clock: %ld\n", + PTR_ERR(esai_priv->extalclk)); + + esai_priv->fsysclk = devm_clk_get(&pdev->dev, "fsys"); + if (IS_ERR(esai_priv->fsysclk)) + dev_warn(&pdev->dev, "failed to get fsys clock: %ld\n", + PTR_ERR(esai_priv->fsysclk)); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "no irq for node %s\n", np->full_name); + return irq; + } + + ret = devm_request_irq(&pdev->dev, irq, esai_isr, 0, + esai_priv->name, esai_priv); + if (ret) { + dev_err(&pdev->dev, "failed to claim irq %u\n", irq); + return ret; + } + + /* Set a default slot size */ + esai_priv->slot_width = 32; + + /* Set a default master/slave state */ + esai_priv->slave_mode = true; + + /* Determine the FIFO depth */ + iprop = of_get_property(np, "fsl,fifo-depth", NULL); + if (iprop) + esai_priv->fifo_depth = be32_to_cpup(iprop); + else + esai_priv->fifo_depth = 64; + + esai_priv->dma_params_tx.maxburst = 16; + esai_priv->dma_params_rx.maxburst = 16; + esai_priv->dma_params_tx.addr = res->start + REG_ESAI_ETDR; + esai_priv->dma_params_rx.addr = res->start + REG_ESAI_ERDR; + + esai_priv->synchronous = + of_property_read_bool(np, "fsl,esai-synchronous"); + + /* Implement full symmetry for synchronous mode */ + if (esai_priv->synchronous) { + fsl_esai_dai.symmetric_rates = 1; + fsl_esai_dai.symmetric_channels = 1; + fsl_esai_dai.symmetric_samplebits = 1; + } + + dev_set_drvdata(&pdev->dev, esai_priv); + + /* Reset ESAI unit */ + ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ERST); + if (ret) { + dev_err(&pdev->dev, "failed to reset ESAI: %d\n", ret); + return ret; + } + + /* + * We need to enable ESAI so as to access some of its registers. + * Otherwise, we would fail to dump regmap from user space. + */ + ret = regmap_write(esai_priv->regmap, REG_ESAI_ECR, ESAI_ECR_ESAIEN); + if (ret) { + dev_err(&pdev->dev, "failed to enable ESAI: %d\n", ret); + return ret; + } + + ret = devm_snd_soc_register_component(&pdev->dev, &fsl_esai_component, + &fsl_esai_dai, 1); + if (ret) { + dev_err(&pdev->dev, "failed to register DAI: %d\n", ret); + return ret; + } + + ret = imx_pcm_dma_init(pdev); + if (ret) + dev_err(&pdev->dev, "failed to init imx pcm dma: %d\n", ret); + + return ret; +} + +static const struct of_device_id fsl_esai_dt_ids[] = { + { .compatible = "fsl,imx35-esai", }, + {} +}; +MODULE_DEVICE_TABLE(of, fsl_esai_dt_ids); + +static struct platform_driver fsl_esai_driver = { + .probe = fsl_esai_probe, + .driver = { + .name = "fsl-esai-dai", + .owner = THIS_MODULE, + .of_match_table = fsl_esai_dt_ids, + }, +}; + +module_platform_driver(fsl_esai_driver); + +MODULE_AUTHOR("Freescale Semiconductor, Inc."); +MODULE_DESCRIPTION("Freescale ESAI CPU DAI driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:fsl-esai-dai"); |