diff options
Diffstat (limited to 'sound/soc/fsl/fsl_ssi.c')
| -rw-r--r-- | sound/soc/fsl/fsl_ssi.c | 1745 |
1 files changed, 1745 insertions, 0 deletions
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c new file mode 100644 index 0000000000..079ac04272 --- /dev/null +++ b/sound/soc/fsl/fsl_ssi.c @@ -0,0 +1,1745 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Freescale SSI ALSA SoC Digital Audio Interface (DAI) driver +// +// Author: Timur Tabi <timur@freescale.com> +// +// Copyright 2007-2010 Freescale Semiconductor, Inc. +// +// 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/ctype.h> +#include <linux/device.h> +#include <linux/delay.h> +#include <linux/mutex.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/dma/imx-dma.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" + +/* Define RX and TX to index ssi->regvals array; Can be 0 or 1 only */ +#define RX 0 +#define TX 1 + +/** + * FSLSSI_I2S_FORMATS: audio formats supported by the SSI + * + * 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 + +/* + * In AC97 mode, TXDIR bit is forced to 0 and TFDIR bit is forced to 1: + * - SSI inputs external bit clock and outputs frame sync clock -- CBM_CFS + * - Also have NB_NF to mark these two clocks will not be inverted + */ +#define FSLSSI_AC97_DAIFMT \ + (SND_SOC_DAIFMT_AC97 | \ + SND_SOC_DAIFMT_BC_FP | \ + SND_SOC_DAIFMT_NB_NF) + +#define FSLSSI_SIER_DBG_RX_FLAGS \ + (SSI_SIER_RFF0_EN | \ + SSI_SIER_RLS_EN | \ + SSI_SIER_RFS_EN | \ + SSI_SIER_ROE0_EN | \ + SSI_SIER_RFRC_EN) +#define FSLSSI_SIER_DBG_TX_FLAGS \ + (SSI_SIER_TFE0_EN | \ + SSI_SIER_TLS_EN | \ + SSI_SIER_TFS_EN | \ + SSI_SIER_TUE0_EN | \ + SSI_SIER_TFRC_EN) + +enum fsl_ssi_type { + FSL_SSI_MCP8610, + FSL_SSI_MX21, + FSL_SSI_MX35, + FSL_SSI_MX51, +}; + +struct fsl_ssi_regvals { + u32 sier; + u32 srcr; + u32 stcr; + u32 scr; +}; + +static bool fsl_ssi_readable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case REG_SSI_SACCEN: + case REG_SSI_SACCDIS: + return false; + default: + return true; + } +} + +static bool fsl_ssi_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case REG_SSI_STX0: + case REG_SSI_STX1: + case REG_SSI_SRX0: + case REG_SSI_SRX1: + case REG_SSI_SISR: + case REG_SSI_SFCSR: + case REG_SSI_SACNT: + case REG_SSI_SACADD: + case REG_SSI_SACDAT: + case REG_SSI_SATAG: + case REG_SSI_SACCST: + case REG_SSI_SOR: + return true; + default: + return false; + } +} + +static bool fsl_ssi_precious_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case REG_SSI_SRX0: + case REG_SSI_SRX1: + case REG_SSI_SISR: + case REG_SSI_SACADD: + case REG_SSI_SACDAT: + case REG_SSI_SATAG: + return true; + default: + return false; + } +} + +static bool fsl_ssi_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case REG_SSI_SRX0: + case REG_SSI_SRX1: + case REG_SSI_SACCST: + return false; + default: + return true; + } +} + +static const struct regmap_config fsl_ssi_regconfig = { + .max_register = REG_SSI_SACCDIS, + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .val_format_endian = REGMAP_ENDIAN_NATIVE, + .num_reg_defaults_raw = REG_SSI_SACCDIS / sizeof(uint32_t) + 1, + .readable_reg = fsl_ssi_readable_reg, + .volatile_reg = fsl_ssi_volatile_reg, + .precious_reg = fsl_ssi_precious_reg, + .writeable_reg = fsl_ssi_writeable_reg, + .cache_type = REGCACHE_FLAT, +}; + +struct fsl_ssi_soc_data { + bool imx; + bool imx21regs; /* imx21-class SSI - no SACC{ST,EN,DIS} regs */ + bool offline_config; + u32 sisr_write_mask; +}; + +/** + * struct fsl_ssi - per-SSI private data + * @regs: Pointer to the regmap registers + * @irq: IRQ of this SSI + * @cpu_dai_drv: CPU DAI driver for this device + * @dai_fmt: DAI configuration this device is currently used with + * @streams: Mask of current active streams: BIT(TX) and BIT(RX) + * @i2s_net: I2S and Network mode configurations of SCR register + * (this is the initial settings based on the DAI format) + * @synchronous: Use synchronous mode - both of TX and RX use STCK and SFCK + * @use_dma: DMA is used or FIQ with stream filter + * @use_dual_fifo: DMA with support for dual FIFO mode + * @use_dyna_fifo: DMA with support for multi FIFO script + * @has_ipg_clk_name: If "ipg" is in the clock name list of device tree + * @fifo_depth: Depth of the SSI FIFOs + * @slot_width: Width of each DAI slot + * @slots: Number of slots + * @regvals: Specific RX/TX register settings + * @clk: Clock source to access register + * @baudclk: Clock source to generate bit and frame-sync clocks + * @baudclk_streams: Active streams that are using baudclk + * @regcache_sfcsr: Cache sfcsr register value during suspend and resume + * @regcache_sacnt: Cache sacnt register value during suspend and resume + * @dma_params_tx: DMA transmit parameters + * @dma_params_rx: DMA receive parameters + * @ssi_phys: physical address of the SSI registers + * @fiq_params: FIQ stream filtering parameters + * @card_pdev: Platform_device pointer to register a sound card for PowerPC or + * to register a CODEC platform device for AC97 + * @card_name: Platform_device name to register a sound card for PowerPC or + * to register a CODEC platform device for AC97 + * @card_idx: The index of SSI to register a sound card for PowerPC or + * to register a CODEC platform device for AC97 + * @dbg_stats: Debugging statistics + * @soc: SoC specific data + * @dev: Pointer to &pdev->dev + * @fifo_watermark: The FIFO watermark setting. Notifies DMA when there are + * @fifo_watermark or fewer words in TX fifo or + * @fifo_watermark or more empty words in RX fifo. + * @dma_maxburst: Max number of words to transfer in one go. So far, + * this is always the same as fifo_watermark. + * @ac97_reg_lock: Mutex lock to serialize AC97 register access operations + * @audio_config: configure for dma multi fifo script + */ +struct fsl_ssi { + struct regmap *regs; + int irq; + struct snd_soc_dai_driver cpu_dai_drv; + + unsigned int dai_fmt; + u8 streams; + u8 i2s_net; + bool synchronous; + bool use_dma; + bool use_dual_fifo; + bool use_dyna_fifo; + bool has_ipg_clk_name; + unsigned int fifo_depth; + unsigned int slot_width; + unsigned int slots; + struct fsl_ssi_regvals regvals[2]; + + struct clk *clk; + struct clk *baudclk; + unsigned int baudclk_streams; + + u32 regcache_sfcsr; + u32 regcache_sacnt; + + struct snd_dmaengine_dai_dma_data dma_params_tx; + struct snd_dmaengine_dai_dma_data dma_params_rx; + dma_addr_t ssi_phys; + + struct imx_pcm_fiq_params fiq_params; + + struct platform_device *card_pdev; + char card_name[32]; + u32 card_idx; + + struct fsl_ssi_dbg dbg_stats; + + const struct fsl_ssi_soc_data *soc; + struct device *dev; + + u32 fifo_watermark; + u32 dma_maxburst; + + struct mutex ac97_reg_lock; + struct sdma_peripheral_config audio_config[2]; +}; + +/* + * SoC specific data + * + * Notes: + * 1) SSI in earlier SoCS has critical bits in control registers that + * cannot be changed after SSI starts running -- a software reset + * (set SSIEN to 0) is required to change their values. So adding + * an offline_config flag for these SoCs. + * 2) SDMA is available since imx35. However, imx35 does not support + * DMA bits changing when SSI is running, so set offline_config. + * 3) imx51 and later versions support register configurations when + * SSI is running (SSIEN); For these versions, DMA needs to be + * configured before SSI sends DMA request to avoid an undefined + * DMA request on the SDMA side. + */ + +static struct fsl_ssi_soc_data fsl_ssi_mpc8610 = { + .imx = false, + .offline_config = true, + .sisr_write_mask = SSI_SISR_RFRC | SSI_SISR_TFRC | + SSI_SISR_ROE0 | SSI_SISR_ROE1 | + SSI_SISR_TUE0 | SSI_SISR_TUE1, +}; + +static struct fsl_ssi_soc_data fsl_ssi_imx21 = { + .imx = true, + .imx21regs = true, + .offline_config = true, + .sisr_write_mask = 0, +}; + +static struct fsl_ssi_soc_data fsl_ssi_imx35 = { + .imx = true, + .offline_config = true, + .sisr_write_mask = SSI_SISR_RFRC | SSI_SISR_TFRC | + SSI_SISR_ROE0 | SSI_SISR_ROE1 | + SSI_SISR_TUE0 | SSI_SISR_TUE1, +}; + +static struct fsl_ssi_soc_data fsl_ssi_imx51 = { + .imx = true, + .offline_config = false, + .sisr_write_mask = SSI_SISR_ROE0 | SSI_SISR_ROE1 | + SSI_SISR_TUE0 | SSI_SISR_TUE1, +}; + +static const struct of_device_id fsl_ssi_ids[] = { + { .compatible = "fsl,mpc8610-ssi", .data = &fsl_ssi_mpc8610 }, + { .compatible = "fsl,imx51-ssi", .data = &fsl_ssi_imx51 }, + { .compatible = "fsl,imx35-ssi", .data = &fsl_ssi_imx35 }, + { .compatible = "fsl,imx21-ssi", .data = &fsl_ssi_imx21 }, + {} +}; +MODULE_DEVICE_TABLE(of, fsl_ssi_ids); + +static bool fsl_ssi_is_ac97(struct fsl_ssi *ssi) +{ + return (ssi->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) == + SND_SOC_DAIFMT_AC97; +} + +static bool fsl_ssi_is_i2s_clock_provider(struct fsl_ssi *ssi) +{ + return (ssi->dai_fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) == + SND_SOC_DAIFMT_BP_FP; +} + +static bool fsl_ssi_is_i2s_bc_fp(struct fsl_ssi *ssi) +{ + return (ssi->dai_fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) == + SND_SOC_DAIFMT_BC_FP; +} + +/** + * fsl_ssi_isr - Interrupt handler to gather states + * @irq: irq number + * @dev_id: context + */ +static irqreturn_t fsl_ssi_isr(int irq, void *dev_id) +{ + struct fsl_ssi *ssi = dev_id; + struct regmap *regs = ssi->regs; + u32 sisr, sisr2; + + regmap_read(regs, REG_SSI_SISR, &sisr); + + sisr2 = sisr & ssi->soc->sisr_write_mask; + /* Clear the bits that we set */ + if (sisr2) + regmap_write(regs, REG_SSI_SISR, sisr2); + + fsl_ssi_dbg_isr(&ssi->dbg_stats, sisr); + + return IRQ_HANDLED; +} + +/** + * fsl_ssi_config_enable - Set SCR, SIER, STCR and SRCR registers with + * cached values in regvals + * @ssi: SSI context + * @tx: direction + * + * Notes: + * 1) For offline_config SoCs, enable all necessary bits of both streams + * when 1st stream starts, even if the opposite stream will not start + * 2) It also clears FIFO before setting regvals; SOR is safe to set online + */ +static void fsl_ssi_config_enable(struct fsl_ssi *ssi, bool tx) +{ + struct fsl_ssi_regvals *vals = ssi->regvals; + int dir = tx ? TX : RX; + u32 sier, srcr, stcr; + + /* Clear dirty data in the FIFO; It also prevents channel slipping */ + regmap_update_bits(ssi->regs, REG_SSI_SOR, + SSI_SOR_xX_CLR(tx), SSI_SOR_xX_CLR(tx)); + + /* + * On offline_config SoCs, SxCR and SIER are already configured when + * the previous stream started. So skip all SxCR and SIER settings + * to prevent online reconfigurations, then jump to set SCR directly + */ + if (ssi->soc->offline_config && ssi->streams) + goto enable_scr; + + if (ssi->soc->offline_config) { + /* + * Online reconfiguration not supported, so enable all bits for + * both streams at once to avoid necessity of reconfigurations + */ + srcr = vals[RX].srcr | vals[TX].srcr; + stcr = vals[RX].stcr | vals[TX].stcr; + sier = vals[RX].sier | vals[TX].sier; + } else { + /* Otherwise, only set bits for the current stream */ + srcr = vals[dir].srcr; + stcr = vals[dir].stcr; + sier = vals[dir].sier; + } + + /* Configure SRCR, STCR and SIER at once */ + regmap_update_bits(ssi->regs, REG_SSI_SRCR, srcr, srcr); + regmap_update_bits(ssi->regs, REG_SSI_STCR, stcr, stcr); + regmap_update_bits(ssi->regs, REG_SSI_SIER, sier, sier); + +enable_scr: + /* + * Start DMA before setting TE to avoid FIFO underrun + * which may cause a channel slip or a channel swap + * + * TODO: FIQ cases might also need this upon testing + */ + if (ssi->use_dma && tx) { + int try = 100; + u32 sfcsr; + + /* Enable SSI first to send TX DMA request */ + regmap_update_bits(ssi->regs, REG_SSI_SCR, + SSI_SCR_SSIEN, SSI_SCR_SSIEN); + + /* Busy wait until TX FIFO not empty -- DMA working */ + do { + regmap_read(ssi->regs, REG_SSI_SFCSR, &sfcsr); + if (SSI_SFCSR_TFCNT0(sfcsr)) + break; + } while (--try); + + /* FIFO still empty -- something might be wrong */ + if (!SSI_SFCSR_TFCNT0(sfcsr)) + dev_warn(ssi->dev, "Timeout waiting TX FIFO filling\n"); + } + /* Enable all remaining bits in SCR */ + regmap_update_bits(ssi->regs, REG_SSI_SCR, + vals[dir].scr, vals[dir].scr); + + /* Log the enabled stream to the mask */ + ssi->streams |= BIT(dir); +} + +/* + * Exclude bits that are used by the opposite stream + * + * When both streams are active, disabling some bits for the current stream + * might break the other stream if these bits are used by it. + * + * @vals : regvals of the current stream + * @avals: regvals of the opposite stream + * @aactive: active state of the opposite stream + * + * 1) XOR vals and avals to get the differences if the other stream is active; + * Otherwise, return current vals if the other stream is not active + * 2) AND the result of 1) with the current vals + */ +#define _ssi_xor_shared_bits(vals, avals, aactive) \ + ((vals) ^ ((avals) * (aactive))) + +#define ssi_excl_shared_bits(vals, avals, aactive) \ + ((vals) & _ssi_xor_shared_bits(vals, avals, aactive)) + +/** + * fsl_ssi_config_disable - Unset SCR, SIER, STCR and SRCR registers + * with cached values in regvals + * @ssi: SSI context + * @tx: direction + * + * Notes: + * 1) For offline_config SoCs, to avoid online reconfigurations, disable all + * bits of both streams at once when the last stream is abort to end + * 2) It also clears FIFO after unsetting regvals; SOR is safe to set online + */ +static void fsl_ssi_config_disable(struct fsl_ssi *ssi, bool tx) +{ + struct fsl_ssi_regvals *vals, *avals; + u32 sier, srcr, stcr, scr; + int adir = tx ? RX : TX; + int dir = tx ? TX : RX; + bool aactive; + + /* Check if the opposite stream is active */ + aactive = ssi->streams & BIT(adir); + + vals = &ssi->regvals[dir]; + + /* Get regvals of the opposite stream to keep opposite stream safe */ + avals = &ssi->regvals[adir]; + + /* + * To keep the other stream safe, exclude shared bits between + * both streams, and get safe bits to disable current stream + */ + scr = ssi_excl_shared_bits(vals->scr, avals->scr, aactive); + + /* Disable safe bits of SCR register for the current stream */ + regmap_update_bits(ssi->regs, REG_SSI_SCR, scr, 0); + + /* Log the disabled stream to the mask */ + ssi->streams &= ~BIT(dir); + + /* + * On offline_config SoCs, if the other stream is active, skip + * SxCR and SIER settings to prevent online reconfigurations + */ + if (ssi->soc->offline_config && aactive) + goto fifo_clear; + + if (ssi->soc->offline_config) { + /* Now there is only current stream active, disable all bits */ + srcr = vals->srcr | avals->srcr; + stcr = vals->stcr | avals->stcr; + sier = vals->sier | avals->sier; + } else { + /* + * To keep the other stream safe, exclude shared bits between + * both streams, and get safe bits to disable current stream + */ + sier = ssi_excl_shared_bits(vals->sier, avals->sier, aactive); + srcr = ssi_excl_shared_bits(vals->srcr, avals->srcr, aactive); + stcr = ssi_excl_shared_bits(vals->stcr, avals->stcr, aactive); + } + + /* Clear configurations of SRCR, STCR and SIER at once */ + regmap_update_bits(ssi->regs, REG_SSI_SRCR, srcr, 0); + regmap_update_bits(ssi->regs, REG_SSI_STCR, stcr, 0); + regmap_update_bits(ssi->regs, REG_SSI_SIER, sier, 0); + +fifo_clear: + /* Clear remaining data in the FIFO */ + regmap_update_bits(ssi->regs, REG_SSI_SOR, + SSI_SOR_xX_CLR(tx), SSI_SOR_xX_CLR(tx)); +} + +static void fsl_ssi_tx_ac97_saccst_setup(struct fsl_ssi *ssi) +{ + struct regmap *regs = ssi->regs; + + /* no SACC{ST,EN,DIS} regs on imx21-class SSI */ + if (!ssi->soc->imx21regs) { + /* Disable all channel slots */ + regmap_write(regs, REG_SSI_SACCDIS, 0xff); + /* Enable slots 3 & 4 -- PCM Playback Left & Right channels */ + regmap_write(regs, REG_SSI_SACCEN, 0x300); + } +} + +/** + * fsl_ssi_setup_regvals - Cache critical bits of SIER, SRCR, STCR and + * SCR to later set them safely + * @ssi: SSI context + */ +static void fsl_ssi_setup_regvals(struct fsl_ssi *ssi) +{ + struct fsl_ssi_regvals *vals = ssi->regvals; + + vals[RX].sier = SSI_SIER_RFF0_EN | FSLSSI_SIER_DBG_RX_FLAGS; + vals[RX].srcr = SSI_SRCR_RFEN0; + vals[RX].scr = SSI_SCR_SSIEN | SSI_SCR_RE; + vals[TX].sier = SSI_SIER_TFE0_EN | FSLSSI_SIER_DBG_TX_FLAGS; + vals[TX].stcr = SSI_STCR_TFEN0; + vals[TX].scr = SSI_SCR_SSIEN | SSI_SCR_TE; + + /* AC97 has already enabled SSIEN, RE and TE, so ignore them */ + if (fsl_ssi_is_ac97(ssi)) + vals[RX].scr = vals[TX].scr = 0; + + if (ssi->use_dual_fifo) { + vals[RX].srcr |= SSI_SRCR_RFEN1; + vals[TX].stcr |= SSI_STCR_TFEN1; + } + + if (ssi->use_dma) { + vals[RX].sier |= SSI_SIER_RDMAE; + vals[TX].sier |= SSI_SIER_TDMAE; + } else { + vals[RX].sier |= SSI_SIER_RIE; + vals[TX].sier |= SSI_SIER_TIE; + } +} + +static void fsl_ssi_setup_ac97(struct fsl_ssi *ssi) +{ + struct regmap *regs = ssi->regs; + + /* Setup the clock control register */ + regmap_write(regs, REG_SSI_STCCR, SSI_SxCCR_WL(17) | SSI_SxCCR_DC(13)); + regmap_write(regs, REG_SSI_SRCCR, SSI_SxCCR_WL(17) | SSI_SxCCR_DC(13)); + + /* Enable AC97 mode and startup the SSI */ + regmap_write(regs, REG_SSI_SACNT, SSI_SACNT_AC97EN | SSI_SACNT_FV); + + /* AC97 has to communicate with codec before starting a stream */ + regmap_update_bits(regs, REG_SSI_SCR, + SSI_SCR_SSIEN | SSI_SCR_TE | SSI_SCR_RE, + SSI_SCR_SSIEN | SSI_SCR_TE | SSI_SCR_RE); + + regmap_write(regs, REG_SSI_SOR, SSI_SOR_WAIT(3)); +} + +static int fsl_ssi_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct fsl_ssi *ssi = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); + int ret; + + ret = clk_prepare_enable(ssi->clk); + if (ret) + return ret; + + /* + * When using dual fifo mode, it is safer to ensure an even period + * size. If appearing to an odd number while DMA always starts its + * task from fifo0, fifo1 would be neglected at the end of each + * period. But SSI would still access fifo1 with an invalid data. + */ + if (ssi->use_dual_fifo || ssi->use_dyna_fifo) + snd_pcm_hw_constraint_step(substream->runtime, 0, + SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2); + + return 0; +} + +static void fsl_ssi_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct fsl_ssi *ssi = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); + + clk_disable_unprepare(ssi->clk); +} + +/** + * fsl_ssi_set_bclk - Configure Digital Audio Interface bit clock + * @substream: ASoC substream + * @dai: pointer to DAI + * @hw_params: pointers to hw_params + * + * Notes: This function can be only called when using SSI as DAI master + * + * Quick instruction for parameters: + * freq: Output BCLK frequency = samplerate * slots * slot_width + * (In 2-channel I2S Master mode, slot_width is fixed 32) + */ +static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai, + struct snd_pcm_hw_params *hw_params) +{ + bool tx2, tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; + struct fsl_ssi *ssi = snd_soc_dai_get_drvdata(dai); + struct regmap *regs = ssi->regs; + u32 pm = 999, div2, psr, stccr, mask, afreq, factor, i; + unsigned long clkrate, baudrate, tmprate; + unsigned int channels = params_channels(hw_params); + unsigned int slot_width = params_width(hw_params); + unsigned int slots = 2; + u64 sub, savesub = 100000; + unsigned int freq; + bool baudclk_is_used; + int ret; + + /* Override slots and slot_width if being specifically set... */ + if (ssi->slots) + slots = ssi->slots; + if (ssi->slot_width) + slot_width = ssi->slot_width; + + /* ...but force 32 bits for stereo audio using I2S Master Mode */ + if (channels == 2 && + (ssi->i2s_net & SSI_SCR_I2S_MODE_MASK) == SSI_SCR_I2S_MODE_MASTER) + slot_width = 32; + + /* Generate bit clock based on the slot number and slot width */ + freq = slots * slot_width * params_rate(hw_params); + + /* Don't apply it to any non-baudclk circumstance */ + if (IS_ERR(ssi->baudclk)) + return -EINVAL; + + /* + * Hardware limitation: The bclk rate must be + * never greater than 1/5 IPG clock rate + */ + if (freq * 5 > clk_get_rate(ssi->clk)) { + dev_err(dai->dev, "bitclk > ipgclk / 5\n"); + return -EINVAL; + } + + baudclk_is_used = ssi->baudclk_streams & ~(BIT(substream->stream)); + + /* It should be already enough to divide clock by setting pm alone */ + psr = 0; + div2 = 0; + + factor = (div2 + 1) * (7 * psr + 1) * 2; + + for (i = 0; i < 255; i++) { + tmprate = freq * factor * (i + 1); + + if (baudclk_is_used) + clkrate = clk_get_rate(ssi->baudclk); + else + clkrate = clk_round_rate(ssi->baudclk, tmprate); + + clkrate /= factor; + afreq = clkrate / (i + 1); + + if (freq == afreq) + sub = 0; + else if (freq / afreq == 1) + sub = freq - afreq; + else if (afreq / freq == 1) + sub = afreq - freq; + else + continue; + + /* Calculate the fraction */ + sub *= 100000; + do_div(sub, freq); + + if (sub < savesub && !(i == 0)) { + baudrate = tmprate; + savesub = sub; + pm = i; + } + + /* We are lucky */ + if (savesub == 0) + break; + } + + /* No proper pm found if it is still remaining the initial value */ + if (pm == 999) { + dev_err(dai->dev, "failed to handle the required sysclk\n"); + return -EINVAL; + } + + stccr = SSI_SxCCR_PM(pm + 1); + mask = SSI_SxCCR_PM_MASK | SSI_SxCCR_DIV2 | SSI_SxCCR_PSR; + + /* STCCR is used for RX in synchronous mode */ + tx2 = tx || ssi->synchronous; + regmap_update_bits(regs, REG_SSI_SxCCR(tx2), mask, stccr); + + if (!baudclk_is_used) { + ret = clk_set_rate(ssi->baudclk, baudrate); + if (ret) { + dev_err(dai->dev, "failed to set baudclk rate\n"); + return -EINVAL; + } + } + + return 0; +} + +/** + * fsl_ssi_hw_params - Configure SSI based on PCM hardware parameters + * @substream: ASoC substream + * @hw_params: pointers to hw_params + * @dai: pointer to DAI + * + * Notes: + * 1) SxCCR.WL bits are critical bits that require SSI to be temporarily + * disabled on offline_config SoCs. Even for online configurable SoCs + * running in synchronous mode (both TX and RX use STCCR), it is not + * safe to re-configure them when both two streams start running. + * 2) SxCCR.PM, SxCCR.DIV2 and SxCCR.PSR bits will be configured in the + * fsl_ssi_set_bclk() if SSI is the DAI clock master. + */ +static int fsl_ssi_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *hw_params, + struct snd_soc_dai *dai) +{ + bool tx2, tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; + struct fsl_ssi *ssi = snd_soc_dai_get_drvdata(dai); + struct fsl_ssi_regvals *vals = ssi->regvals; + struct regmap *regs = ssi->regs; + unsigned int channels = params_channels(hw_params); + unsigned int sample_size = params_width(hw_params); + u32 wl = SSI_SxCCR_WL(sample_size); + int ret; + + if (fsl_ssi_is_i2s_clock_provider(ssi)) { + ret = fsl_ssi_set_bclk(substream, dai, hw_params); + if (ret) + return ret; + + /* Do not enable the clock if it is already enabled */ + if (!(ssi->baudclk_streams & BIT(substream->stream))) { + ret = clk_prepare_enable(ssi->baudclk); + if (ret) + return ret; + + ssi->baudclk_streams |= BIT(substream->stream); + } + } + + /* + * SSI is properly configured if it is enabled and running in + * the synchronous mode; Note that AC97 mode is an exception + * that should set separate configurations for STCCR and SRCCR + * despite running in the synchronous mode. + */ + if (ssi->streams && ssi->synchronous) + return 0; + + if (!fsl_ssi_is_ac97(ssi)) { + /* + * Keep the ssi->i2s_net intact while having a local variable + * to override settings for special use cases. Otherwise, the + * ssi->i2s_net will lose the settings for regular use cases. + */ + u8 i2s_net = ssi->i2s_net; + + /* Normal + Network mode to send 16-bit data in 32-bit frames */ + if (fsl_ssi_is_i2s_bc_fp(ssi) && sample_size == 16) + i2s_net = SSI_SCR_I2S_MODE_NORMAL | SSI_SCR_NET; + + /* Use Normal mode to send mono data at 1st slot of 2 slots */ + if (channels == 1) + i2s_net = SSI_SCR_I2S_MODE_NORMAL; + + regmap_update_bits(regs, REG_SSI_SCR, + SSI_SCR_I2S_NET_MASK, i2s_net); + } + + /* In synchronous mode, the SSI uses STCCR for capture */ + tx2 = tx || ssi->synchronous; + regmap_update_bits(regs, REG_SSI_SxCCR(tx2), SSI_SxCCR_WL_MASK, wl); + + if (ssi->use_dyna_fifo) { + if (channels == 1) { + ssi->audio_config[0].n_fifos_dst = 1; + ssi->audio_config[1].n_fifos_src = 1; + vals[RX].srcr &= ~SSI_SRCR_RFEN1; + vals[TX].stcr &= ~SSI_STCR_TFEN1; + vals[RX].scr &= ~SSI_SCR_TCH_EN; + vals[TX].scr &= ~SSI_SCR_TCH_EN; + } else { + ssi->audio_config[0].n_fifos_dst = 2; + ssi->audio_config[1].n_fifos_src = 2; + vals[RX].srcr |= SSI_SRCR_RFEN1; + vals[TX].stcr |= SSI_STCR_TFEN1; + vals[RX].scr |= SSI_SCR_TCH_EN; + vals[TX].scr |= SSI_SCR_TCH_EN; + } + ssi->dma_params_tx.peripheral_config = &ssi->audio_config[0]; + ssi->dma_params_tx.peripheral_size = sizeof(ssi->audio_config[0]); + ssi->dma_params_rx.peripheral_config = &ssi->audio_config[1]; + ssi->dma_params_rx.peripheral_size = sizeof(ssi->audio_config[1]); + } + + return 0; +} + +static int fsl_ssi_hw_free(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); + struct fsl_ssi *ssi = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); + + if (fsl_ssi_is_i2s_clock_provider(ssi) && + ssi->baudclk_streams & BIT(substream->stream)) { + clk_disable_unprepare(ssi->baudclk); + ssi->baudclk_streams &= ~BIT(substream->stream); + } + + return 0; +} + +static int _fsl_ssi_set_dai_fmt(struct fsl_ssi *ssi, unsigned int fmt) +{ + u32 strcr = 0, scr = 0, stcr, srcr, mask; + unsigned int slots; + + ssi->dai_fmt = fmt; + + /* Synchronize frame sync clock for TE to avoid data slipping */ + scr |= SSI_SCR_SYNC_TX_FS; + + /* Set to default shifting settings: LSB_ALIGNED */ + strcr |= SSI_STCR_TXBIT0; + + /* Use Network mode as default */ + ssi->i2s_net = SSI_SCR_NET; + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_I2S: + switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) { + case SND_SOC_DAIFMT_BP_FP: + if (IS_ERR(ssi->baudclk)) { + dev_err(ssi->dev, + "missing baudclk for master mode\n"); + return -EINVAL; + } + fallthrough; + case SND_SOC_DAIFMT_BC_FP: + ssi->i2s_net |= SSI_SCR_I2S_MODE_MASTER; + break; + case SND_SOC_DAIFMT_BC_FC: + ssi->i2s_net |= SSI_SCR_I2S_MODE_SLAVE; + break; + default: + return -EINVAL; + } + + slots = ssi->slots ? : 2; + regmap_update_bits(ssi->regs, REG_SSI_STCCR, + SSI_SxCCR_DC_MASK, SSI_SxCCR_DC(slots)); + regmap_update_bits(ssi->regs, REG_SSI_SRCCR, + SSI_SxCCR_DC_MASK, SSI_SxCCR_DC(slots)); + + /* Data on rising edge of bclk, frame low, 1clk before data */ + strcr |= SSI_STCR_TFSI | SSI_STCR_TSCKP | SSI_STCR_TEFS; + break; + case SND_SOC_DAIFMT_LEFT_J: + /* Data on rising edge of bclk, frame high */ + strcr |= SSI_STCR_TSCKP; + break; + case SND_SOC_DAIFMT_DSP_A: + /* Data on rising edge of bclk, frame high, 1clk before data */ + strcr |= SSI_STCR_TFSL | SSI_STCR_TSCKP | SSI_STCR_TEFS; + break; + case SND_SOC_DAIFMT_DSP_B: + /* Data on rising edge of bclk, frame high */ + strcr |= SSI_STCR_TFSL | SSI_STCR_TSCKP; + break; + case SND_SOC_DAIFMT_AC97: + /* Data on falling edge of bclk, frame high, 1clk before data */ + strcr |= SSI_STCR_TEFS; + break; + default: + return -EINVAL; + } + + scr |= ssi->i2s_net; + + /* 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 */ + strcr ^= SSI_STCR_TSCKP; + break; + case SND_SOC_DAIFMT_NB_IF: + /* Invert frame clock */ + strcr ^= SSI_STCR_TFSI; + break; + case SND_SOC_DAIFMT_IB_IF: + /* Invert both clocks */ + strcr ^= SSI_STCR_TSCKP; + strcr ^= SSI_STCR_TFSI; + break; + default: + return -EINVAL; + } + + /* DAI clock provider masks */ + switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) { + case SND_SOC_DAIFMT_BP_FP: + /* Output bit and frame sync clocks */ + strcr |= SSI_STCR_TFDIR | SSI_STCR_TXDIR; + scr |= SSI_SCR_SYS_CLK_EN; + break; + case SND_SOC_DAIFMT_BC_FC: + /* Input bit or frame sync clocks */ + break; + case SND_SOC_DAIFMT_BC_FP: + /* Input bit clock but output frame sync clock */ + strcr |= SSI_STCR_TFDIR; + break; + default: + return -EINVAL; + } + + stcr = strcr; + srcr = strcr; + + /* Set SYN mode and clear RXDIR bit when using SYN or AC97 mode */ + if (ssi->synchronous || fsl_ssi_is_ac97(ssi)) { + srcr &= ~SSI_SRCR_RXDIR; + scr |= SSI_SCR_SYN; + } + + mask = SSI_STCR_TFDIR | SSI_STCR_TXDIR | SSI_STCR_TSCKP | + SSI_STCR_TFSL | SSI_STCR_TFSI | SSI_STCR_TEFS | SSI_STCR_TXBIT0; + + regmap_update_bits(ssi->regs, REG_SSI_STCR, mask, stcr); + regmap_update_bits(ssi->regs, REG_SSI_SRCR, mask, srcr); + + mask = SSI_SCR_SYNC_TX_FS | SSI_SCR_I2S_MODE_MASK | + SSI_SCR_SYS_CLK_EN | SSI_SCR_SYN; + regmap_update_bits(ssi->regs, REG_SSI_SCR, mask, scr); + + return 0; +} + +/** + * fsl_ssi_set_dai_fmt - Configure Digital Audio Interface (DAI) Format + * @dai: pointer to DAI + * @fmt: format mask + */ +static int fsl_ssi_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt) +{ + struct fsl_ssi *ssi = snd_soc_dai_get_drvdata(dai); + + /* AC97 configured DAIFMT earlier in the probe() */ + if (fsl_ssi_is_ac97(ssi)) + return 0; + + return _fsl_ssi_set_dai_fmt(ssi, fmt); +} + +/** + * fsl_ssi_set_dai_tdm_slot - Set TDM slot number and slot width + * @dai: pointer to DAI + * @tx_mask: mask for TX + * @rx_mask: mask for RX + * @slots: number of slots + * @slot_width: number of bits per slot + */ +static int fsl_ssi_set_dai_tdm_slot(struct snd_soc_dai *dai, u32 tx_mask, + u32 rx_mask, int slots, int slot_width) +{ + struct fsl_ssi *ssi = snd_soc_dai_get_drvdata(dai); + struct regmap *regs = ssi->regs; + u32 val; + + /* The word length should be 8, 10, 12, 16, 18, 20, 22 or 24 */ + if (slot_width & 1 || slot_width < 8 || slot_width > 24) { + dev_err(dai->dev, "invalid slot width: %d\n", slot_width); + return -EINVAL; + } + + /* The slot number should be >= 2 if using Network mode or I2S mode */ + if (ssi->i2s_net && slots < 2) { + dev_err(dai->dev, "slot number should be >= 2 in I2S or NET\n"); + return -EINVAL; + } + + regmap_update_bits(regs, REG_SSI_STCCR, + SSI_SxCCR_DC_MASK, SSI_SxCCR_DC(slots)); + regmap_update_bits(regs, REG_SSI_SRCCR, + SSI_SxCCR_DC_MASK, SSI_SxCCR_DC(slots)); + + /* Save the SCR register value */ + regmap_read(regs, REG_SSI_SCR, &val); + /* Temporarily enable SSI to allow SxMSKs to be configurable */ + regmap_update_bits(regs, REG_SSI_SCR, SSI_SCR_SSIEN, SSI_SCR_SSIEN); + + regmap_write(regs, REG_SSI_STMSK, ~tx_mask); + regmap_write(regs, REG_SSI_SRMSK, ~rx_mask); + + /* Restore the value of SSIEN bit */ + regmap_update_bits(regs, REG_SSI_SCR, SSI_SCR_SSIEN, val); + + ssi->slot_width = slot_width; + ssi->slots = slots; + + return 0; +} + +/** + * fsl_ssi_trigger - Start or stop SSI and corresponding DMA transaction. + * @substream: ASoC substream + * @cmd: trigger command + * @dai: pointer to DAI + * + * 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 = asoc_substream_to_rtd(substream); + struct fsl_ssi *ssi = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0)); + bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + /* + * SACCST might be modified via AC Link by a CODEC if it sends + * extra bits in their SLOTREQ requests, which'll accidentally + * send valid data to slots other than normal playback slots. + * + * To be safe, configure SACCST right before TX starts. + */ + if (tx && fsl_ssi_is_ac97(ssi)) + fsl_ssi_tx_ac97_saccst_setup(ssi); + fsl_ssi_config_enable(ssi, tx); + break; + + case SNDRV_PCM_TRIGGER_STOP: + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + fsl_ssi_config_disable(ssi, tx); + break; + + default: + return -EINVAL; + } + + return 0; +} + +static int fsl_ssi_dai_probe(struct snd_soc_dai *dai) +{ + struct fsl_ssi *ssi = snd_soc_dai_get_drvdata(dai); + + if (ssi->soc->imx && ssi->use_dma) + snd_soc_dai_init_dma_data(dai, &ssi->dma_params_tx, + &ssi->dma_params_rx); + + return 0; +} + +static const struct snd_soc_dai_ops fsl_ssi_dai_ops = { + .probe = fsl_ssi_dai_probe, + .startup = fsl_ssi_startup, + .shutdown = fsl_ssi_shutdown, + .hw_params = fsl_ssi_hw_params, + .hw_free = fsl_ssi_hw_free, + .set_fmt = fsl_ssi_set_dai_fmt, + .set_tdm_slot = fsl_ssi_set_dai_tdm_slot, + .trigger = fsl_ssi_trigger, +}; + +static struct snd_soc_dai_driver fsl_ssi_dai_template = { + .playback = { + .stream_name = "CPU-Playback", + .channels_min = 1, + .channels_max = 32, + .rates = SNDRV_PCM_RATE_CONTINUOUS, + .formats = FSLSSI_I2S_FORMATS, + }, + .capture = { + .stream_name = "CPU-Capture", + .channels_min = 1, + .channels_max = 32, + .rates = SNDRV_PCM_RATE_CONTINUOUS, + .formats = FSLSSI_I2S_FORMATS, + }, + .ops = &fsl_ssi_dai_ops, +}; + +static const struct snd_soc_component_driver fsl_ssi_component = { + .name = "fsl-ssi", + .legacy_dai_naming = 1, +}; + +static struct snd_soc_dai_driver fsl_ssi_ac97_dai = { + .symmetric_channels = 1, + .playback = { + .stream_name = "CPU AC97 Playback", + .channels_min = 2, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_8000_48000, + .formats = SNDRV_PCM_FMTBIT_S16 | SNDRV_PCM_FMTBIT_S20, + }, + .capture = { + .stream_name = "CPU AC97 Capture", + .channels_min = 2, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_48000, + /* 16-bit capture is broken (errata ERR003778) */ + .formats = SNDRV_PCM_FMTBIT_S20, + }, + .ops = &fsl_ssi_dai_ops, +}; + +static struct fsl_ssi *fsl_ac97_data; + +static void fsl_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg, + unsigned short val) +{ + struct regmap *regs = fsl_ac97_data->regs; + unsigned int lreg; + unsigned int lval; + int ret; + + if (reg > 0x7f) + return; + + mutex_lock(&fsl_ac97_data->ac97_reg_lock); + + ret = clk_prepare_enable(fsl_ac97_data->clk); + if (ret) { + pr_err("ac97 write clk_prepare_enable failed: %d\n", + ret); + goto ret_unlock; + } + + lreg = reg << 12; + regmap_write(regs, REG_SSI_SACADD, lreg); + + lval = val << 4; + regmap_write(regs, REG_SSI_SACDAT, lval); + + regmap_update_bits(regs, REG_SSI_SACNT, + SSI_SACNT_RDWR_MASK, SSI_SACNT_WR); + udelay(100); + + clk_disable_unprepare(fsl_ac97_data->clk); + +ret_unlock: + mutex_unlock(&fsl_ac97_data->ac97_reg_lock); +} + +static unsigned short fsl_ssi_ac97_read(struct snd_ac97 *ac97, + unsigned short reg) +{ + struct regmap *regs = fsl_ac97_data->regs; + unsigned short val = 0; + u32 reg_val; + unsigned int lreg; + int ret; + + mutex_lock(&fsl_ac97_data->ac97_reg_lock); + + ret = clk_prepare_enable(fsl_ac97_data->clk); + if (ret) { + pr_err("ac97 read clk_prepare_enable failed: %d\n", ret); + goto ret_unlock; + } + + lreg = (reg & 0x7f) << 12; + regmap_write(regs, REG_SSI_SACADD, lreg); + regmap_update_bits(regs, REG_SSI_SACNT, + SSI_SACNT_RDWR_MASK, SSI_SACNT_RD); + + udelay(100); + + regmap_read(regs, REG_SSI_SACDAT, ®_val); + val = (reg_val >> 4) & 0xffff; + + clk_disable_unprepare(fsl_ac97_data->clk); + +ret_unlock: + mutex_unlock(&fsl_ac97_data->ac97_reg_lock); + return val; +} + +static struct snd_ac97_bus_ops fsl_ssi_ac97_ops = { + .read = fsl_ssi_ac97_read, + .write = fsl_ssi_ac97_write, +}; + +/** + * fsl_ssi_hw_init - Initialize SSI registers + * @ssi: SSI context + */ +static int fsl_ssi_hw_init(struct fsl_ssi *ssi) +{ + u32 wm = ssi->fifo_watermark; + + /* Initialize regvals */ + fsl_ssi_setup_regvals(ssi); + + /* Set watermarks */ + regmap_write(ssi->regs, REG_SSI_SFCSR, + SSI_SFCSR_TFWM0(wm) | SSI_SFCSR_RFWM0(wm) | + SSI_SFCSR_TFWM1(wm) | SSI_SFCSR_RFWM1(wm)); + + /* Enable Dual FIFO mode */ + if (ssi->use_dual_fifo) + regmap_update_bits(ssi->regs, REG_SSI_SCR, + SSI_SCR_TCH_EN, SSI_SCR_TCH_EN); + + /* AC97 should start earlier to communicate with CODECs */ + if (fsl_ssi_is_ac97(ssi)) { + _fsl_ssi_set_dai_fmt(ssi, ssi->dai_fmt); + fsl_ssi_setup_ac97(ssi); + } + + return 0; +} + +/** + * fsl_ssi_hw_clean - Clear SSI registers + * @ssi: SSI context + */ +static void fsl_ssi_hw_clean(struct fsl_ssi *ssi) +{ + /* Disable registers for AC97 */ + if (fsl_ssi_is_ac97(ssi)) { + /* Disable TE and RE bits first */ + regmap_update_bits(ssi->regs, REG_SSI_SCR, + SSI_SCR_TE | SSI_SCR_RE, 0); + /* Disable AC97 mode */ + regmap_write(ssi->regs, REG_SSI_SACNT, 0); + /* Unset WAIT bits */ + regmap_write(ssi->regs, REG_SSI_SOR, 0); + /* Disable SSI -- software reset */ + regmap_update_bits(ssi->regs, REG_SSI_SCR, SSI_SCR_SSIEN, 0); + } +} + +/* + * Make every character in a string lower-case + */ +static void make_lowercase(char *s) +{ + if (!s) + return; + for (; *s; s++) + *s = tolower(*s); +} + +static int fsl_ssi_imx_probe(struct platform_device *pdev, + struct fsl_ssi *ssi, void __iomem *iomem) +{ + struct device *dev = &pdev->dev; + int ret; + + /* Backward compatible for a DT without ipg clock name assigned */ + if (ssi->has_ipg_clk_name) + ssi->clk = devm_clk_get(dev, "ipg"); + else + ssi->clk = devm_clk_get(dev, NULL); + if (IS_ERR(ssi->clk)) { + ret = PTR_ERR(ssi->clk); + dev_err(dev, "failed to get clock: %d\n", ret); + return ret; + } + + /* Enable the clock since regmap will not handle it in this case */ + if (!ssi->has_ipg_clk_name) { + ret = clk_prepare_enable(ssi->clk); + if (ret) { + dev_err(dev, "clk_prepare_enable failed: %d\n", ret); + return ret; + } + } + + /* Do not error out for consumer cases that live without a baud clock */ + ssi->baudclk = devm_clk_get(dev, "baud"); + if (IS_ERR(ssi->baudclk)) + dev_dbg(dev, "failed to get baud clock: %ld\n", + PTR_ERR(ssi->baudclk)); + + ssi->dma_params_tx.maxburst = ssi->dma_maxburst; + ssi->dma_params_rx.maxburst = ssi->dma_maxburst; + ssi->dma_params_tx.addr = ssi->ssi_phys + REG_SSI_STX0; + ssi->dma_params_rx.addr = ssi->ssi_phys + REG_SSI_SRX0; + + /* Use even numbers to avoid channel swap due to SDMA script design */ + if (ssi->use_dual_fifo || ssi->use_dyna_fifo) { + ssi->dma_params_tx.maxburst &= ~0x1; + ssi->dma_params_rx.maxburst &= ~0x1; + } + + if (!ssi->use_dma) { + /* + * Some boards use an incompatible codec. Use imx-fiq-pcm-audio + * to get it working, as DMA is not possible in this situation. + */ + ssi->fiq_params.irq = ssi->irq; + ssi->fiq_params.base = iomem; + ssi->fiq_params.dma_params_rx = &ssi->dma_params_rx; + ssi->fiq_params.dma_params_tx = &ssi->dma_params_tx; + + ret = imx_pcm_fiq_init(pdev, &ssi->fiq_params); + if (ret) + goto error_pcm; + } else { + ret = imx_pcm_dma_init(pdev); + if (ret) + goto error_pcm; + } + + return 0; + +error_pcm: + if (!ssi->has_ipg_clk_name) + clk_disable_unprepare(ssi->clk); + + return ret; +} + +static void fsl_ssi_imx_clean(struct platform_device *pdev, struct fsl_ssi *ssi) +{ + if (!ssi->use_dma) + imx_pcm_fiq_exit(pdev); + if (!ssi->has_ipg_clk_name) + clk_disable_unprepare(ssi->clk); +} + +static int fsl_ssi_probe_from_dt(struct fsl_ssi *ssi) +{ + struct device *dev = ssi->dev; + struct device_node *np = dev->of_node; + const char *p, *sprop; + const __be32 *iprop; + u32 dmas[4]; + int ret; + + ret = of_property_match_string(np, "clock-names", "ipg"); + /* Get error code if not found */ + ssi->has_ipg_clk_name = ret >= 0; + + /* Check if being used in AC97 mode */ + sprop = of_get_property(np, "fsl,mode", NULL); + if (sprop && !strcmp(sprop, "ac97-slave")) { + ssi->dai_fmt = FSLSSI_AC97_DAIFMT; + + ret = of_property_read_u32(np, "cell-index", &ssi->card_idx); + if (ret) { + dev_err(dev, "failed to get SSI index property\n"); + return -EINVAL; + } + strcpy(ssi->card_name, "ac97-codec"); + } else if (!of_property_read_bool(np, "fsl,ssi-asynchronous")) { + /* + * In synchronous mode, STCK and STFS ports are used by RX + * as well. So the software should limit the sample rates, + * sample bits and channels to be symmetric. + * + * This is exclusive with FSLSSI_AC97_FORMATS as AC97 runs + * in the SSI synchronous mode however it does not have to + * limit symmetric sample rates and sample bits. + */ + ssi->synchronous = true; + } + + /* Select DMA or FIQ */ + ssi->use_dma = !of_property_read_bool(np, "fsl,fiq-stream-filter"); + + /* Fetch FIFO depth; Set to 8 for older DT without this property */ + iprop = of_get_property(np, "fsl,fifo-depth", NULL); + if (iprop) + ssi->fifo_depth = be32_to_cpup(iprop); + else + ssi->fifo_depth = 8; + + /* Use dual FIFO mode depending on the support from SDMA script */ + ret = of_property_read_u32_array(np, "dmas", dmas, 4); + if (ssi->use_dma && !ret && dmas[2] == IMX_DMATYPE_SSI_DUAL) + ssi->use_dual_fifo = true; + + if (ssi->use_dma && !ret && dmas[2] == IMX_DMATYPE_MULTI_SAI) + ssi->use_dyna_fifo = true; + /* + * Backward compatible for older bindings by manually triggering the + * machine driver's probe(). Use /compatible property, including the + * address of CPU DAI driver structure, as the name of machine driver + * + * If card_name is set by AC97 earlier, bypass here since it uses a + * different name to register the device. + */ + if (!ssi->card_name[0] && of_get_property(np, "codec-handle", NULL)) { + struct device_node *root = of_find_node_by_path("/"); + + sprop = of_get_property(root, "compatible", NULL); + of_node_put(root); + /* Strip "fsl," in the compatible name if applicable */ + p = strrchr(sprop, ','); + if (p) + sprop = p + 1; + snprintf(ssi->card_name, sizeof(ssi->card_name), + "snd-soc-%s", sprop); + make_lowercase(ssi->card_name); + ssi->card_idx = 0; + } + + return 0; +} + +static int fsl_ssi_probe(struct platform_device *pdev) +{ + struct regmap_config regconfig = fsl_ssi_regconfig; + struct device *dev = &pdev->dev; + struct fsl_ssi *ssi; + struct resource *res; + void __iomem *iomem; + int ret = 0; + + ssi = devm_kzalloc(dev, sizeof(*ssi), GFP_KERNEL); + if (!ssi) + return -ENOMEM; + + ssi->dev = dev; + ssi->soc = of_device_get_match_data(&pdev->dev); + + /* Probe from DT */ + ret = fsl_ssi_probe_from_dt(ssi); + if (ret) + return ret; + + if (fsl_ssi_is_ac97(ssi)) { + memcpy(&ssi->cpu_dai_drv, &fsl_ssi_ac97_dai, + sizeof(fsl_ssi_ac97_dai)); + fsl_ac97_data = ssi; + } else { + memcpy(&ssi->cpu_dai_drv, &fsl_ssi_dai_template, + sizeof(fsl_ssi_dai_template)); + } + ssi->cpu_dai_drv.name = dev_name(dev); + + iomem = devm_platform_get_and_ioremap_resource(pdev, 0, &res); + if (IS_ERR(iomem)) + return PTR_ERR(iomem); + ssi->ssi_phys = res->start; + + if (ssi->soc->imx21regs) { + /* No SACC{ST,EN,DIS} regs in imx21-class SSI */ + regconfig.max_register = REG_SSI_SRMSK; + regconfig.num_reg_defaults_raw = + REG_SSI_SRMSK / sizeof(uint32_t) + 1; + } + + if (ssi->has_ipg_clk_name) + ssi->regs = devm_regmap_init_mmio_clk(dev, "ipg", iomem, + ®config); + else + ssi->regs = devm_regmap_init_mmio(dev, iomem, ®config); + if (IS_ERR(ssi->regs)) { + dev_err(dev, "failed to init register map\n"); + return PTR_ERR(ssi->regs); + } + + ssi->irq = platform_get_irq(pdev, 0); + if (ssi->irq < 0) + return ssi->irq; + + /* Set software limitations for synchronous mode except AC97 */ + if (ssi->synchronous && !fsl_ssi_is_ac97(ssi)) { + ssi->cpu_dai_drv.symmetric_rate = 1; + ssi->cpu_dai_drv.symmetric_channels = 1; + ssi->cpu_dai_drv.symmetric_sample_bits = 1; + } + + /* + * Configure TX and RX DMA watermarks -- when to send a DMA request + * + * Values should be tested to avoid FIFO under/over run. Set maxburst + * to fifo_watermark to maxiumize DMA transaction to reduce overhead. + */ + switch (ssi->fifo_depth) { + case 15: + /* + * Set to 8 as a balanced configuration -- When TX FIFO has 8 + * empty slots, send a DMA request to fill these 8 slots. The + * remaining 7 slots should be able to allow DMA to finish the + * transaction before TX FIFO underruns; Same applies to RX. + * + * Tested with cases running at 48kHz @ 16 bits x 16 channels + */ + ssi->fifo_watermark = 8; + ssi->dma_maxburst = 8; + break; + case 8: + default: + /* Safely use old watermark configurations for older chips */ + ssi->fifo_watermark = ssi->fifo_depth - 2; + ssi->dma_maxburst = ssi->fifo_depth - 2; + break; + } + + dev_set_drvdata(dev, ssi); + + if (ssi->soc->imx) { + ret = fsl_ssi_imx_probe(pdev, ssi, iomem); + if (ret) + return ret; + } + + if (fsl_ssi_is_ac97(ssi)) { + mutex_init(&ssi->ac97_reg_lock); + ret = snd_soc_set_ac97_ops_of_reset(&fsl_ssi_ac97_ops, pdev); + if (ret) { + dev_err(dev, "failed to set AC'97 ops\n"); + goto error_ac97_ops; + } + } + + ret = devm_snd_soc_register_component(dev, &fsl_ssi_component, + &ssi->cpu_dai_drv, 1); + if (ret) { + dev_err(dev, "failed to register DAI: %d\n", ret); + goto error_asoc_register; + } + + if (ssi->use_dma) { + ret = devm_request_irq(dev, ssi->irq, fsl_ssi_isr, 0, + dev_name(dev), ssi); + if (ret < 0) { + dev_err(dev, "failed to claim irq %u\n", ssi->irq); + goto error_asoc_register; + } + } + + fsl_ssi_debugfs_create(&ssi->dbg_stats, dev); + + /* Initially configures SSI registers */ + fsl_ssi_hw_init(ssi); + + /* Register a platform device for older bindings or AC97 */ + if (ssi->card_name[0]) { + struct device *parent = dev; + /* + * Do not set SSI dev as the parent of AC97 CODEC device since + * it does not have a DT node. Otherwise ASoC core will assume + * CODEC has the same DT node as the SSI, so it may bypass the + * dai_probe() of SSI and then cause NULL DMA data pointers. + */ + if (fsl_ssi_is_ac97(ssi)) + parent = NULL; + + ssi->card_pdev = platform_device_register_data(parent, + ssi->card_name, ssi->card_idx, NULL, 0); + if (IS_ERR(ssi->card_pdev)) { + ret = PTR_ERR(ssi->card_pdev); + dev_err(dev, "failed to register %s: %d\n", + ssi->card_name, ret); + goto error_sound_card; + } + } + + return 0; + +error_sound_card: + fsl_ssi_debugfs_remove(&ssi->dbg_stats); +error_asoc_register: + if (fsl_ssi_is_ac97(ssi)) + snd_soc_set_ac97_ops(NULL); +error_ac97_ops: + if (fsl_ssi_is_ac97(ssi)) + mutex_destroy(&ssi->ac97_reg_lock); + + if (ssi->soc->imx) + fsl_ssi_imx_clean(pdev, ssi); + + return ret; +} + +static void fsl_ssi_remove(struct platform_device *pdev) +{ + struct fsl_ssi *ssi = dev_get_drvdata(&pdev->dev); + + fsl_ssi_debugfs_remove(&ssi->dbg_stats); + + if (ssi->card_pdev) + platform_device_unregister(ssi->card_pdev); + + /* Clean up SSI registers */ + fsl_ssi_hw_clean(ssi); + + if (ssi->soc->imx) + fsl_ssi_imx_clean(pdev, ssi); + + if (fsl_ssi_is_ac97(ssi)) { + snd_soc_set_ac97_ops(NULL); + mutex_destroy(&ssi->ac97_reg_lock); + } +} + +#ifdef CONFIG_PM_SLEEP +static int fsl_ssi_suspend(struct device *dev) +{ + struct fsl_ssi *ssi = dev_get_drvdata(dev); + struct regmap *regs = ssi->regs; + + regmap_read(regs, REG_SSI_SFCSR, &ssi->regcache_sfcsr); + regmap_read(regs, REG_SSI_SACNT, &ssi->regcache_sacnt); + + regcache_cache_only(regs, true); + regcache_mark_dirty(regs); + + return 0; +} + +static int fsl_ssi_resume(struct device *dev) +{ + struct fsl_ssi *ssi = dev_get_drvdata(dev); + struct regmap *regs = ssi->regs; + + regcache_cache_only(regs, false); + + regmap_update_bits(regs, REG_SSI_SFCSR, + SSI_SFCSR_RFWM1_MASK | SSI_SFCSR_TFWM1_MASK | + SSI_SFCSR_RFWM0_MASK | SSI_SFCSR_TFWM0_MASK, + ssi->regcache_sfcsr); + regmap_write(regs, REG_SSI_SACNT, ssi->regcache_sacnt); + + return regcache_sync(regs); +} +#endif /* CONFIG_PM_SLEEP */ + +static const struct dev_pm_ops fsl_ssi_pm = { + SET_SYSTEM_SLEEP_PM_OPS(fsl_ssi_suspend, fsl_ssi_resume) +}; + +static struct platform_driver fsl_ssi_driver = { + .driver = { + .name = "fsl-ssi-dai", + .of_match_table = fsl_ssi_ids, + .pm = &fsl_ssi_pm, + }, + .probe = fsl_ssi_probe, + .remove_new = 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"); |