| /* |
| * Freescale SSI ALSA SoC Digital Audio Interface (DAI) driver |
| * |
| * Author: Timur Tabi <timur@freescale.com> |
| * |
| * Copyright 2007-2010 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. |
| * |
| * |
| * Some notes why imx-pcm-fiq is used instead of DMA on some boards: |
| * |
| * The i.MX SSI core has some nasty limitations in AC97 mode. While most |
| * sane processor vendors have a FIFO per AC97 slot, the i.MX has only |
| * one FIFO which combines all valid receive slots. We cannot even select |
| * which slots we want to receive. The WM9712 with which this driver |
| * was developed with always sends GPIO status data in slot 12 which |
| * we receive in our (PCM-) data stream. The only chance we have is to |
| * manually skip this data in the FIQ handler. With sampling rates different |
| * from 48000Hz not every frame has valid receive data, so the ratio |
| * between pcm data and GPIO status data changes. Our FIQ handler is not |
| * able to handle this, hence this driver only works with 48000Hz sampling |
| * rate. |
| * Reading and writing AC97 registers is another challenge. The core |
| * provides us status bits when the read register is updated with *another* |
| * value. When we read the same register two times (and the register still |
| * contains the same value) these status bits are not set. We work |
| * around this by not polling these bits but only wait a fixed delay. |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/interrupt.h> |
| #include <linux/clk.h> |
| #include <linux/device.h> |
| #include <linux/delay.h> |
| #include <linux/slab.h> |
| #include <linux/of_address.h> |
| #include <linux/of_irq.h> |
| #include <linux/of_platform.h> |
| |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/initval.h> |
| #include <sound/soc.h> |
| #include <sound/dmaengine_pcm.h> |
| |
| #include "fsl_ssi.h" |
| #include "imx-pcm.h" |
| |
| #ifdef PPC |
| #define read_ssi(addr) in_be32(addr) |
| #define write_ssi(val, addr) out_be32(addr, val) |
| #define write_ssi_mask(addr, clear, set) clrsetbits_be32(addr, clear, set) |
| #else |
| #define read_ssi(addr) readl(addr) |
| #define write_ssi(val, addr) writel(val, addr) |
| /* |
| * FIXME: Proper locking should be added at write_ssi_mask caller level |
| * to ensure this register read/modify/write sequence is race free. |
| */ |
| static inline void write_ssi_mask(u32 __iomem *addr, u32 clear, u32 set) |
| { |
| u32 val = readl(addr); |
| val = (val & ~clear) | set; |
| writel(val, addr); |
| } |
| #endif |
| |
| /** |
| * FSLSSI_I2S_RATES: sample rates supported by the I2S |
| * |
| * This driver currently only supports the SSI running in I2S slave mode, |
| * which means the codec determines the sample rate. Therefore, we tell |
| * ALSA that we support all rates and let the codec driver decide what rates |
| * are really supported. |
| */ |
| #define FSLSSI_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \ |
| SNDRV_PCM_RATE_CONTINUOUS) |
| |
| /** |
| * FSLSSI_I2S_FORMATS: audio formats supported by the SSI |
| * |
| * This driver currently only supports the SSI running in I2S slave mode. |
| * |
| * The SSI has a limitation in that the samples must be in the same byte |
| * order as the host CPU. This is because when multiple bytes are written |
| * to the STX register, the bytes and bits must be written in the same |
| * order. The STX is a shift register, so all the bits need to be aligned |
| * (bit-endianness must match byte-endianness). Processors typically write |
| * the bits within a byte in the same order that the bytes of a word are |
| * written in. So if the host CPU is big-endian, then only big-endian |
| * samples will be written to STX properly. |
| */ |
| #ifdef __BIG_ENDIAN |
| #define FSLSSI_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \ |
| SNDRV_PCM_FMTBIT_S18_3BE | SNDRV_PCM_FMTBIT_S20_3BE | \ |
| SNDRV_PCM_FMTBIT_S24_3BE | SNDRV_PCM_FMTBIT_S24_BE) |
| #else |
| #define FSLSSI_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE | \ |
| SNDRV_PCM_FMTBIT_S18_3LE | SNDRV_PCM_FMTBIT_S20_3LE | \ |
| SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_LE) |
| #endif |
| |
| /* SIER bitflag of interrupts to enable */ |
| #define SIER_FLAGS (CCSR_SSI_SIER_TFRC_EN | CCSR_SSI_SIER_TDMAE | \ |
| CCSR_SSI_SIER_TIE | CCSR_SSI_SIER_TUE0_EN | \ |
| CCSR_SSI_SIER_TUE1_EN | CCSR_SSI_SIER_RFRC_EN | \ |
| CCSR_SSI_SIER_RDMAE | CCSR_SSI_SIER_RIE | \ |
| CCSR_SSI_SIER_ROE0_EN | CCSR_SSI_SIER_ROE1_EN) |
| |
| /** |
| * fsl_ssi_private: per-SSI private data |
| * |
| * @ssi: pointer to the SSI's registers |
| * @ssi_phys: physical address of the SSI registers |
| * @irq: IRQ of this SSI |
| * @first_stream: pointer to the stream that was opened first |
| * @second_stream: pointer to second stream |
| * @playback: the number of playback streams opened |
| * @capture: the number of capture streams opened |
| * @cpu_dai: the CPU DAI for this device |
| * @dev_attr: the sysfs device attribute structure |
| * @stats: SSI statistics |
| * @name: name for this device |
| */ |
| struct fsl_ssi_private { |
| struct ccsr_ssi __iomem *ssi; |
| dma_addr_t ssi_phys; |
| unsigned int irq; |
| struct snd_pcm_substream *first_stream; |
| struct snd_pcm_substream *second_stream; |
| unsigned int fifo_depth; |
| struct snd_soc_dai_driver cpu_dai_drv; |
| struct device_attribute dev_attr; |
| struct platform_device *pdev; |
| |
| bool new_binding; |
| bool ssi_on_imx; |
| bool use_dma; |
| struct clk *clk; |
| struct snd_dmaengine_dai_dma_data dma_params_tx; |
| struct snd_dmaengine_dai_dma_data dma_params_rx; |
| struct imx_dma_data filter_data_tx; |
| struct imx_dma_data filter_data_rx; |
| struct imx_pcm_fiq_params fiq_params; |
| |
| struct { |
| unsigned int rfrc; |
| unsigned int tfrc; |
| unsigned int cmdau; |
| unsigned int cmddu; |
| unsigned int rxt; |
| unsigned int rdr1; |
| unsigned int rdr0; |
| unsigned int tde1; |
| unsigned int tde0; |
| unsigned int roe1; |
| unsigned int roe0; |
| unsigned int tue1; |
| unsigned int tue0; |
| unsigned int tfs; |
| unsigned int rfs; |
| unsigned int tls; |
| unsigned int rls; |
| unsigned int rff1; |
| unsigned int rff0; |
| unsigned int tfe1; |
| unsigned int tfe0; |
| } stats; |
| |
| char name[1]; |
| }; |
| |
| /** |
| * fsl_ssi_isr: SSI interrupt handler |
| * |
| * Although it's possible to use the interrupt handler to send and receive |
| * data to/from the SSI, we use the DMA instead. Programming is more |
| * complicated, but the performance is much better. |
| * |
| * This interrupt handler is used only to gather statistics. |
| * |
| * @irq: IRQ of the SSI device |
| * @dev_id: pointer to the ssi_private structure for this SSI device |
| */ |
| static irqreturn_t fsl_ssi_isr(int irq, void *dev_id) |
| { |
| struct fsl_ssi_private *ssi_private = dev_id; |
| struct ccsr_ssi __iomem *ssi = ssi_private->ssi; |
| irqreturn_t ret = IRQ_NONE; |
| __be32 sisr; |
| __be32 sisr2 = 0; |
| |
| /* We got an interrupt, so read the status register to see what we |
| were interrupted for. We mask it with the Interrupt Enable register |
| so that we only check for events that we're interested in. |
| */ |
| sisr = read_ssi(&ssi->sisr) & SIER_FLAGS; |
| |
| if (sisr & CCSR_SSI_SISR_RFRC) { |
| ssi_private->stats.rfrc++; |
| sisr2 |= CCSR_SSI_SISR_RFRC; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_TFRC) { |
| ssi_private->stats.tfrc++; |
| sisr2 |= CCSR_SSI_SISR_TFRC; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_CMDAU) { |
| ssi_private->stats.cmdau++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_CMDDU) { |
| ssi_private->stats.cmddu++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_RXT) { |
| ssi_private->stats.rxt++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_RDR1) { |
| ssi_private->stats.rdr1++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_RDR0) { |
| ssi_private->stats.rdr0++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_TDE1) { |
| ssi_private->stats.tde1++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_TDE0) { |
| ssi_private->stats.tde0++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_ROE1) { |
| ssi_private->stats.roe1++; |
| sisr2 |= CCSR_SSI_SISR_ROE1; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_ROE0) { |
| ssi_private->stats.roe0++; |
| sisr2 |= CCSR_SSI_SISR_ROE0; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_TUE1) { |
| ssi_private->stats.tue1++; |
| sisr2 |= CCSR_SSI_SISR_TUE1; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_TUE0) { |
| ssi_private->stats.tue0++; |
| sisr2 |= CCSR_SSI_SISR_TUE0; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_TFS) { |
| ssi_private->stats.tfs++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_RFS) { |
| ssi_private->stats.rfs++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_TLS) { |
| ssi_private->stats.tls++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_RLS) { |
| ssi_private->stats.rls++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_RFF1) { |
| ssi_private->stats.rff1++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_RFF0) { |
| ssi_private->stats.rff0++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_TFE1) { |
| ssi_private->stats.tfe1++; |
| ret = IRQ_HANDLED; |
| } |
| |
| if (sisr & CCSR_SSI_SISR_TFE0) { |
| ssi_private->stats.tfe0++; |
| ret = IRQ_HANDLED; |
| } |
| |
| /* Clear the bits that we set */ |
| if (sisr2) |
| write_ssi(sisr2, &ssi->sisr); |
| |
| return ret; |
| } |
| |
| /** |
| * fsl_ssi_startup: create a new substream |
| * |
| * This is the first function called when a stream is opened. |
| * |
| * If this is the first stream open, then grab the IRQ and program most of |
| * the SSI registers. |
| */ |
| static int fsl_ssi_startup(struct snd_pcm_substream *substream, |
| struct snd_soc_dai *dai) |
| { |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| struct fsl_ssi_private *ssi_private = |
| snd_soc_dai_get_drvdata(rtd->cpu_dai); |
| int synchronous = ssi_private->cpu_dai_drv.symmetric_rates; |
| |
| /* |
| * If this is the first stream opened, then request the IRQ |
| * and initialize the SSI registers. |
| */ |
| if (!ssi_private->first_stream) { |
| struct ccsr_ssi __iomem *ssi = ssi_private->ssi; |
| |
| ssi_private->first_stream = substream; |
| |
| /* |
| * Section 16.5 of the MPC8610 reference manual says that the |
| * SSI needs to be disabled before updating the registers we set |
| * here. |
| */ |
| write_ssi_mask(&ssi->scr, CCSR_SSI_SCR_SSIEN, 0); |
| |
| /* |
| * Program the SSI into I2S Slave Non-Network Synchronous mode. |
| * Also enable the transmit and receive FIFO. |
| * |
| * FIXME: Little-endian samples require a different shift dir |
| */ |
| write_ssi_mask(&ssi->scr, |
| CCSR_SSI_SCR_I2S_MODE_MASK | CCSR_SSI_SCR_SYN, |
| CCSR_SSI_SCR_TFR_CLK_DIS | CCSR_SSI_SCR_I2S_MODE_SLAVE |
| | (synchronous ? CCSR_SSI_SCR_SYN : 0)); |
| |
| write_ssi(CCSR_SSI_STCR_TXBIT0 | CCSR_SSI_STCR_TFEN0 | |
| CCSR_SSI_STCR_TFSI | CCSR_SSI_STCR_TEFS | |
| CCSR_SSI_STCR_TSCKP, &ssi->stcr); |
| |
| write_ssi(CCSR_SSI_SRCR_RXBIT0 | CCSR_SSI_SRCR_RFEN0 | |
| CCSR_SSI_SRCR_RFSI | CCSR_SSI_SRCR_REFS | |
| CCSR_SSI_SRCR_RSCKP, &ssi->srcr); |
| |
| /* |
| * The DC and PM bits are only used if the SSI is the clock |
| * master. |
| */ |
| |
| /* Enable the interrupts and DMA requests */ |
| if (ssi_private->use_dma) |
| write_ssi(SIER_FLAGS, &ssi->sier); |
| else |
| write_ssi(CCSR_SSI_SIER_TIE | CCSR_SSI_SIER_TFE0_EN | |
| CCSR_SSI_SIER_RIE | |
| CCSR_SSI_SIER_RFF0_EN, &ssi->sier); |
| |
| /* |
| * Set the watermark for transmit FIFI 0 and receive FIFO 0. We |
| * don't use FIFO 1. We program the transmit water to signal a |
| * DMA transfer if there are only two (or fewer) elements left |
| * in the FIFO. Two elements equals one frame (left channel, |
| * right channel). This value, however, depends on the depth of |
| * the transmit buffer. |
| * |
| * We program the receive FIFO to notify us if at least two |
| * elements (one frame) have been written to the FIFO. We could |
| * make this value larger (and maybe we should), but this way |
| * data will be written to memory as soon as it's available. |
| */ |
| write_ssi(CCSR_SSI_SFCSR_TFWM0(ssi_private->fifo_depth - 2) | |
| CCSR_SSI_SFCSR_RFWM0(ssi_private->fifo_depth - 2), |
| &ssi->sfcsr); |
| |
| /* |
| * We keep the SSI disabled because if we enable it, then the |
| * DMA controller will start. It's not supposed to start until |
| * the SCR.TE (or SCR.RE) bit is set, but it does anyway. The |
| * DMA controller will transfer one "BWC" of data (i.e. the |
| * amount of data that the MR.BWC bits are set to). The reason |
| * this is bad is because at this point, the PCM driver has not |
| * finished initializing the DMA controller. |
| */ |
| } else { |
| if (synchronous) { |
| struct snd_pcm_runtime *first_runtime = |
| ssi_private->first_stream->runtime; |
| /* |
| * This is the second stream open, and we're in |
| * synchronous mode, so we need to impose sample |
| * sample size constraints. This is because STCCR is |
| * used for playback and capture in synchronous mode, |
| * so there's no way to specify different word |
| * lengths. |
| * |
| * Note that this can cause a race condition if the |
| * second stream is opened before the first stream is |
| * fully initialized. We provide some protection by |
| * checking to make sure the first stream is |
| * initialized, but it's not perfect. ALSA sometimes |
| * re-initializes the driver with a different sample |
| * rate or size. If the second stream is opened |
| * before the first stream has received its final |
| * parameters, then the second stream may be |
| * constrained to the wrong sample rate or size. |
| */ |
| if (!first_runtime->sample_bits) { |
| dev_err(substream->pcm->card->dev, |
| "set sample size in %s stream first\n", |
| substream->stream == |
| SNDRV_PCM_STREAM_PLAYBACK |
| ? "capture" : "playback"); |
| return -EAGAIN; |
| } |
| |
| snd_pcm_hw_constraint_minmax(substream->runtime, |
| SNDRV_PCM_HW_PARAM_SAMPLE_BITS, |
| first_runtime->sample_bits, |
| first_runtime->sample_bits); |
| } |
| |
| ssi_private->second_stream = substream; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * fsl_ssi_hw_params - program the sample size |
| * |
| * Most of the SSI registers have been programmed in the startup function, |
| * but the word length must be programmed here. Unfortunately, programming |
| * the SxCCR.WL bits requires the SSI to be temporarily disabled. This can |
| * cause a problem with supporting simultaneous playback and capture. If |
| * the SSI is already playing a stream, then that stream may be temporarily |
| * stopped when you start capture. |
| * |
| * Note: The SxCCR.DC and SxCCR.PM bits are only used if the SSI is the |
| * clock master. |
| */ |
| static int fsl_ssi_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *hw_params, struct snd_soc_dai *cpu_dai) |
| { |
| struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(cpu_dai); |
| struct ccsr_ssi __iomem *ssi = ssi_private->ssi; |
| unsigned int sample_size = |
| snd_pcm_format_width(params_format(hw_params)); |
| u32 wl = CCSR_SSI_SxCCR_WL(sample_size); |
| int enabled = read_ssi(&ssi->scr) & CCSR_SSI_SCR_SSIEN; |
| |
| /* |
| * If we're in synchronous mode, and the SSI is already enabled, |
| * then STCCR is already set properly. |
| */ |
| if (enabled && ssi_private->cpu_dai_drv.symmetric_rates) |
| return 0; |
| |
| /* |
| * FIXME: The documentation says that SxCCR[WL] should not be |
| * modified while the SSI is enabled. The only time this can |
| * happen is if we're trying to do simultaneous playback and |
| * capture in asynchronous mode. Unfortunately, I have been enable |
| * to get that to work at all on the P1022DS. Therefore, we don't |
| * bother to disable/enable the SSI when setting SxCCR[WL], because |
| * the SSI will stop anyway. Maybe one day, this will get fixed. |
| */ |
| |
| /* In synchronous mode, the SSI uses STCCR for capture */ |
| if ((substream->stream == SNDRV_PCM_STREAM_PLAYBACK) || |
| ssi_private->cpu_dai_drv.symmetric_rates) |
| write_ssi_mask(&ssi->stccr, CCSR_SSI_SxCCR_WL_MASK, wl); |
| else |
| write_ssi_mask(&ssi->srccr, CCSR_SSI_SxCCR_WL_MASK, wl); |
| |
| return 0; |
| } |
| |
| /** |
| * fsl_ssi_trigger: start and stop the DMA transfer. |
| * |
| * This function is called by ALSA to start, stop, pause, and resume the DMA |
| * transfer of data. |
| * |
| * The DMA channel is in external master start and pause mode, which |
| * means the SSI completely controls the flow of data. |
| */ |
| static int fsl_ssi_trigger(struct snd_pcm_substream *substream, int cmd, |
| struct snd_soc_dai *dai) |
| { |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(rtd->cpu_dai); |
| struct ccsr_ssi __iomem *ssi = ssi_private->ssi; |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_START: |
| case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| write_ssi_mask(&ssi->scr, 0, |
| CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_TE); |
| else |
| write_ssi_mask(&ssi->scr, 0, |
| CCSR_SSI_SCR_SSIEN | CCSR_SSI_SCR_RE); |
| break; |
| |
| case SNDRV_PCM_TRIGGER_STOP: |
| case SNDRV_PCM_TRIGGER_PAUSE_PUSH: |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| write_ssi_mask(&ssi->scr, CCSR_SSI_SCR_TE, 0); |
| else |
| write_ssi_mask(&ssi->scr, CCSR_SSI_SCR_RE, 0); |
| |
| if ((read_ssi(&ssi->scr) & (CCSR_SSI_SCR_TE | CCSR_SSI_SCR_RE)) == 0) |
| write_ssi_mask(&ssi->scr, CCSR_SSI_SCR_SSIEN, 0); |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * fsl_ssi_shutdown: shutdown the SSI |
| * |
| * Shutdown the SSI if there are no other substreams open. |
| */ |
| static void fsl_ssi_shutdown(struct snd_pcm_substream *substream, |
| struct snd_soc_dai *dai) |
| { |
| struct snd_soc_pcm_runtime *rtd = substream->private_data; |
| struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(rtd->cpu_dai); |
| |
| if (ssi_private->first_stream == substream) |
| ssi_private->first_stream = ssi_private->second_stream; |
| |
| ssi_private->second_stream = NULL; |
| } |
| |
| static int fsl_ssi_dai_probe(struct snd_soc_dai *dai) |
| { |
| struct fsl_ssi_private *ssi_private = snd_soc_dai_get_drvdata(dai); |
| |
| if (ssi_private->ssi_on_imx && ssi_private->use_dma) { |
| dai->playback_dma_data = &ssi_private->dma_params_tx; |
| dai->capture_dma_data = &ssi_private->dma_params_rx; |
| } |
| |
| return 0; |
| } |
| |
| static const struct snd_soc_dai_ops fsl_ssi_dai_ops = { |
| .startup = fsl_ssi_startup, |
| .hw_params = fsl_ssi_hw_params, |
| .shutdown = fsl_ssi_shutdown, |
| .trigger = fsl_ssi_trigger, |
| }; |
| |
| /* Template for the CPU dai driver structure */ |
| static struct snd_soc_dai_driver fsl_ssi_dai_template = { |
| .probe = fsl_ssi_dai_probe, |
| .playback = { |
| /* The SSI does not support monaural audio. */ |
| .channels_min = 2, |
| .channels_max = 2, |
| .rates = FSLSSI_I2S_RATES, |
| .formats = FSLSSI_I2S_FORMATS, |
| }, |
| .capture = { |
| .channels_min = 2, |
| .channels_max = 2, |
| .rates = FSLSSI_I2S_RATES, |
| .formats = FSLSSI_I2S_FORMATS, |
| }, |
| .ops = &fsl_ssi_dai_ops, |
| }; |
| |
| static const struct snd_soc_component_driver fsl_ssi_component = { |
| .name = "fsl-ssi", |
| }; |
| |
| /* Show the statistics of a flag only if its interrupt is enabled. The |
| * compiler will optimze this code to a no-op if the interrupt is not |
| * enabled. |
| */ |
| #define SIER_SHOW(flag, name) \ |
| do { \ |
| if (SIER_FLAGS & CCSR_SSI_SIER_##flag) \ |
| length += sprintf(buf + length, #name "=%u\n", \ |
| ssi_private->stats.name); \ |
| } while (0) |
| |
| |
| /** |
| * fsl_sysfs_ssi_show: display SSI statistics |
| * |
| * Display the statistics for the current SSI device. To avoid confusion, |
| * we only show those counts that are enabled. |
| */ |
| static ssize_t fsl_sysfs_ssi_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct fsl_ssi_private *ssi_private = |
| container_of(attr, struct fsl_ssi_private, dev_attr); |
| ssize_t length = 0; |
| |
| SIER_SHOW(RFRC_EN, rfrc); |
| SIER_SHOW(TFRC_EN, tfrc); |
| SIER_SHOW(CMDAU_EN, cmdau); |
| SIER_SHOW(CMDDU_EN, cmddu); |
| SIER_SHOW(RXT_EN, rxt); |
| SIER_SHOW(RDR1_EN, rdr1); |
| SIER_SHOW(RDR0_EN, rdr0); |
| SIER_SHOW(TDE1_EN, tde1); |
| SIER_SHOW(TDE0_EN, tde0); |
| SIER_SHOW(ROE1_EN, roe1); |
| SIER_SHOW(ROE0_EN, roe0); |
| SIER_SHOW(TUE1_EN, tue1); |
| SIER_SHOW(TUE0_EN, tue0); |
| SIER_SHOW(TFS_EN, tfs); |
| SIER_SHOW(RFS_EN, rfs); |
| SIER_SHOW(TLS_EN, tls); |
| SIER_SHOW(RLS_EN, rls); |
| SIER_SHOW(RFF1_EN, rff1); |
| SIER_SHOW(RFF0_EN, rff0); |
| SIER_SHOW(TFE1_EN, tfe1); |
| SIER_SHOW(TFE0_EN, tfe0); |
| |
| return length; |
| } |
| |
| /** |
| * Make every character in a string lower-case |
| */ |
| static void make_lowercase(char *s) |
| { |
| char *p = s; |
| char c; |
| |
| while ((c = *p)) { |
| if ((c >= 'A') && (c <= 'Z')) |
| *p = c + ('a' - 'A'); |
| p++; |
| } |
| } |
| |
| static int fsl_ssi_probe(struct platform_device *pdev) |
| { |
| struct fsl_ssi_private *ssi_private; |
| int ret = 0; |
| struct device_attribute *dev_attr = NULL; |
| struct device_node *np = pdev->dev.of_node; |
| const char *p, *sprop; |
| const uint32_t *iprop; |
| struct resource res; |
| char name[64]; |
| bool shared; |
| |
| /* SSIs that are not connected on the board should have a |
| * status = "disabled" |
| * property in their device tree nodes. |
| */ |
| if (!of_device_is_available(np)) |
| return -ENODEV; |
| |
| /* We only support the SSI in "I2S Slave" mode */ |
| sprop = of_get_property(np, "fsl,mode", NULL); |
| if (!sprop || strcmp(sprop, "i2s-slave")) { |
| dev_notice(&pdev->dev, "mode %s is unsupported\n", sprop); |
| return -ENODEV; |
| } |
| |
| /* The DAI name is the last part of the full name of the node. */ |
| p = strrchr(np->full_name, '/') + 1; |
| ssi_private = devm_kzalloc(&pdev->dev, sizeof(*ssi_private) + strlen(p), |
| GFP_KERNEL); |
| if (!ssi_private) { |
| dev_err(&pdev->dev, "could not allocate DAI object\n"); |
| return -ENOMEM; |
| } |
| |
| strcpy(ssi_private->name, p); |
| |
| ssi_private->use_dma = !of_property_read_bool(np, |
| "fsl,fiq-stream-filter"); |
| |
| /* Initialize this copy of the CPU DAI driver structure */ |
| memcpy(&ssi_private->cpu_dai_drv, &fsl_ssi_dai_template, |
| sizeof(fsl_ssi_dai_template)); |
| ssi_private->cpu_dai_drv.name = ssi_private->name; |
| |
| /* Get the addresses and IRQ */ |
| ret = of_address_to_resource(np, 0, &res); |
| if (ret) { |
| dev_err(&pdev->dev, "could not determine device resources\n"); |
| return ret; |
| } |
| ssi_private->ssi = of_iomap(np, 0); |
| if (!ssi_private->ssi) { |
| dev_err(&pdev->dev, "could not map device resources\n"); |
| return -ENOMEM; |
| } |
| ssi_private->ssi_phys = res.start; |
| |
| ssi_private->irq = irq_of_parse_and_map(np, 0); |
| if (ssi_private->irq == NO_IRQ) { |
| dev_err(&pdev->dev, "no irq for node %s\n", np->full_name); |
| return -ENXIO; |
| } |
| |
| if (ssi_private->use_dma) { |
| /* The 'name' should not have any slashes in it. */ |
| ret = devm_request_irq(&pdev->dev, ssi_private->irq, |
| fsl_ssi_isr, 0, ssi_private->name, |
| ssi_private); |
| if (ret < 0) { |
| dev_err(&pdev->dev, "could not claim irq %u\n", |
| ssi_private->irq); |
| goto error_irqmap; |
| } |
| } |
| |
| /* Are the RX and the TX clocks locked? */ |
| if (!of_find_property(np, "fsl,ssi-asynchronous", NULL)) |
| ssi_private->cpu_dai_drv.symmetric_rates = 1; |
| |
| /* Determine the FIFO depth. */ |
| iprop = of_get_property(np, "fsl,fifo-depth", NULL); |
| if (iprop) |
| ssi_private->fifo_depth = be32_to_cpup(iprop); |
| else |
| /* Older 8610 DTs didn't have the fifo-depth property */ |
| ssi_private->fifo_depth = 8; |
| |
| if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx21-ssi")) { |
| u32 dma_events[2]; |
| ssi_private->ssi_on_imx = true; |
| |
| ssi_private->clk = devm_clk_get(&pdev->dev, NULL); |
| if (IS_ERR(ssi_private->clk)) { |
| ret = PTR_ERR(ssi_private->clk); |
| dev_err(&pdev->dev, "could not get clock: %d\n", ret); |
| goto error_irqmap; |
| } |
| ret = clk_prepare_enable(ssi_private->clk); |
| if (ret) { |
| dev_err(&pdev->dev, "clk_prepare_enable failed: %d\n", |
| ret); |
| goto error_irqmap; |
| } |
| |
| /* |
| * We have burstsize be "fifo_depth - 2" to match the SSI |
| * watermark setting in fsl_ssi_startup(). |
| */ |
| ssi_private->dma_params_tx.maxburst = |
| ssi_private->fifo_depth - 2; |
| ssi_private->dma_params_rx.maxburst = |
| ssi_private->fifo_depth - 2; |
| ssi_private->dma_params_tx.addr = |
| ssi_private->ssi_phys + offsetof(struct ccsr_ssi, stx0); |
| ssi_private->dma_params_rx.addr = |
| ssi_private->ssi_phys + offsetof(struct ccsr_ssi, srx0); |
| ssi_private->dma_params_tx.filter_data = |
| &ssi_private->filter_data_tx; |
| ssi_private->dma_params_rx.filter_data = |
| &ssi_private->filter_data_rx; |
| /* |
| * TODO: This is a temporary solution and should be changed |
| * to use generic DMA binding later when the helplers get in. |
| */ |
| ret = of_property_read_u32_array(pdev->dev.of_node, |
| "fsl,ssi-dma-events", dma_events, 2); |
| if (ret && !ssi_private->use_dma) { |
| dev_err(&pdev->dev, "could not get dma events\n"); |
| goto error_clk; |
| } |
| |
| shared = of_device_is_compatible(of_get_parent(np), |
| "fsl,spba-bus"); |
| |
| imx_pcm_dma_params_init_data(&ssi_private->filter_data_tx, |
| dma_events[0], shared ? IMX_DMATYPE_SSI_SP : IMX_DMATYPE_SSI); |
| imx_pcm_dma_params_init_data(&ssi_private->filter_data_rx, |
| dma_events[1], shared ? IMX_DMATYPE_SSI_SP : IMX_DMATYPE_SSI); |
| } |
| |
| /* Initialize the the device_attribute structure */ |
| dev_attr = &ssi_private->dev_attr; |
| sysfs_attr_init(&dev_attr->attr); |
| dev_attr->attr.name = "statistics"; |
| dev_attr->attr.mode = S_IRUGO; |
| dev_attr->show = fsl_sysfs_ssi_show; |
| |
| ret = device_create_file(&pdev->dev, dev_attr); |
| if (ret) { |
| dev_err(&pdev->dev, "could not create sysfs %s file\n", |
| ssi_private->dev_attr.attr.name); |
| goto error_clk; |
| } |
| |
| /* Register with ASoC */ |
| dev_set_drvdata(&pdev->dev, ssi_private); |
| |
| ret = snd_soc_register_component(&pdev->dev, &fsl_ssi_component, |
| &ssi_private->cpu_dai_drv, 1); |
| if (ret) { |
| dev_err(&pdev->dev, "failed to register DAI: %d\n", ret); |
| goto error_dev; |
| } |
| |
| if (ssi_private->ssi_on_imx) { |
| if (!ssi_private->use_dma) { |
| |
| /* |
| * Some boards use an incompatible codec. To get it |
| * working, we are using imx-fiq-pcm-audio, that |
| * can handle those codecs. DMA is not possible in this |
| * situation. |
| */ |
| |
| ssi_private->fiq_params.irq = ssi_private->irq; |
| ssi_private->fiq_params.base = ssi_private->ssi; |
| ssi_private->fiq_params.dma_params_rx = |
| &ssi_private->dma_params_rx; |
| ssi_private->fiq_params.dma_params_tx = |
| &ssi_private->dma_params_tx; |
| |
| ret = imx_pcm_fiq_init(pdev, &ssi_private->fiq_params); |
| if (ret) |
| goto error_dev; |
| } else { |
| ret = imx_pcm_dma_init(pdev); |
| if (ret) |
| goto error_dev; |
| } |
| } |
| |
| /* |
| * If codec-handle property is missing from SSI node, we assume |
| * that the machine driver uses new binding which does not require |
| * SSI driver to trigger machine driver's probe. |
| */ |
| if (!of_get_property(np, "codec-handle", NULL)) { |
| ssi_private->new_binding = true; |
| goto done; |
| } |
| |
| /* Trigger the machine driver's probe function. The platform driver |
| * name of the machine driver is taken from /compatible property of the |
| * device tree. We also pass the address of the CPU DAI driver |
| * structure. |
| */ |
| sprop = of_get_property(of_find_node_by_path("/"), "compatible", NULL); |
| /* Sometimes the compatible name has a "fsl," prefix, so we strip it. */ |
| p = strrchr(sprop, ','); |
| if (p) |
| sprop = p + 1; |
| snprintf(name, sizeof(name), "snd-soc-%s", sprop); |
| make_lowercase(name); |
| |
| ssi_private->pdev = |
| platform_device_register_data(&pdev->dev, name, 0, NULL, 0); |
| if (IS_ERR(ssi_private->pdev)) { |
| ret = PTR_ERR(ssi_private->pdev); |
| dev_err(&pdev->dev, "failed to register platform: %d\n", ret); |
| goto error_dai; |
| } |
| |
| done: |
| return 0; |
| |
| error_dai: |
| if (ssi_private->ssi_on_imx) |
| imx_pcm_dma_exit(pdev); |
| snd_soc_unregister_component(&pdev->dev); |
| |
| error_dev: |
| dev_set_drvdata(&pdev->dev, NULL); |
| device_remove_file(&pdev->dev, dev_attr); |
| |
| error_clk: |
| if (ssi_private->ssi_on_imx) |
| clk_disable_unprepare(ssi_private->clk); |
| |
| error_irqmap: |
| irq_dispose_mapping(ssi_private->irq); |
| |
| return ret; |
| } |
| |
| static int fsl_ssi_remove(struct platform_device *pdev) |
| { |
| struct fsl_ssi_private *ssi_private = dev_get_drvdata(&pdev->dev); |
| |
| if (!ssi_private->new_binding) |
| platform_device_unregister(ssi_private->pdev); |
| if (ssi_private->ssi_on_imx) { |
| imx_pcm_dma_exit(pdev); |
| clk_disable_unprepare(ssi_private->clk); |
| } |
| snd_soc_unregister_component(&pdev->dev); |
| device_remove_file(&pdev->dev, &ssi_private->dev_attr); |
| irq_dispose_mapping(ssi_private->irq); |
| dev_set_drvdata(&pdev->dev, NULL); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id fsl_ssi_ids[] = { |
| { .compatible = "fsl,mpc8610-ssi", }, |
| { .compatible = "fsl,imx21-ssi", }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, fsl_ssi_ids); |
| |
| static struct platform_driver fsl_ssi_driver = { |
| .driver = { |
| .name = "fsl-ssi-dai", |
| .owner = THIS_MODULE, |
| .of_match_table = fsl_ssi_ids, |
| }, |
| .probe = fsl_ssi_probe, |
| .remove = fsl_ssi_remove, |
| }; |
| |
| module_platform_driver(fsl_ssi_driver); |
| |
| MODULE_ALIAS("platform:fsl-ssi-dai"); |
| MODULE_AUTHOR("Timur Tabi <timur@freescale.com>"); |
| MODULE_DESCRIPTION("Freescale Synchronous Serial Interface (SSI) ASoC Driver"); |
| MODULE_LICENSE("GPL v2"); |