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Diffstat (limited to '')
| -rw-r--r-- | sound/soc/stm/stm32_spdifrx.c | 1016 |
1 files changed, 1016 insertions, 0 deletions
diff --git a/sound/soc/stm/stm32_spdifrx.c b/sound/soc/stm/stm32_spdifrx.c new file mode 100644 index 000000000..07082f7ef --- /dev/null +++ b/sound/soc/stm/stm32_spdifrx.c @@ -0,0 +1,1016 @@ +/* + * STM32 ALSA SoC Digital Audio Interface (SPDIF-rx) driver. + * + * Copyright (C) 2017, STMicroelectronics - All Rights Reserved + * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics. + * + * License terms: GPL V2.0. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more + * details. + */ + +#include <linux/clk.h> +#include <linux/completion.h> +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/regmap.h> +#include <linux/reset.h> + +#include <sound/dmaengine_pcm.h> +#include <sound/pcm_params.h> + +/* SPDIF-rx Register Map */ +#define STM32_SPDIFRX_CR 0x00 +#define STM32_SPDIFRX_IMR 0x04 +#define STM32_SPDIFRX_SR 0x08 +#define STM32_SPDIFRX_IFCR 0x0C +#define STM32_SPDIFRX_DR 0x10 +#define STM32_SPDIFRX_CSR 0x14 +#define STM32_SPDIFRX_DIR 0x18 + +/* Bit definition for SPDIF_CR register */ +#define SPDIFRX_CR_SPDIFEN_SHIFT 0 +#define SPDIFRX_CR_SPDIFEN_MASK GENMASK(1, SPDIFRX_CR_SPDIFEN_SHIFT) +#define SPDIFRX_CR_SPDIFENSET(x) ((x) << SPDIFRX_CR_SPDIFEN_SHIFT) + +#define SPDIFRX_CR_RXDMAEN BIT(2) +#define SPDIFRX_CR_RXSTEO BIT(3) + +#define SPDIFRX_CR_DRFMT_SHIFT 4 +#define SPDIFRX_CR_DRFMT_MASK GENMASK(5, SPDIFRX_CR_DRFMT_SHIFT) +#define SPDIFRX_CR_DRFMTSET(x) ((x) << SPDIFRX_CR_DRFMT_SHIFT) + +#define SPDIFRX_CR_PMSK BIT(6) +#define SPDIFRX_CR_VMSK BIT(7) +#define SPDIFRX_CR_CUMSK BIT(8) +#define SPDIFRX_CR_PTMSK BIT(9) +#define SPDIFRX_CR_CBDMAEN BIT(10) +#define SPDIFRX_CR_CHSEL_SHIFT 11 +#define SPDIFRX_CR_CHSEL BIT(SPDIFRX_CR_CHSEL_SHIFT) + +#define SPDIFRX_CR_NBTR_SHIFT 12 +#define SPDIFRX_CR_NBTR_MASK GENMASK(13, SPDIFRX_CR_NBTR_SHIFT) +#define SPDIFRX_CR_NBTRSET(x) ((x) << SPDIFRX_CR_NBTR_SHIFT) + +#define SPDIFRX_CR_WFA BIT(14) + +#define SPDIFRX_CR_INSEL_SHIFT 16 +#define SPDIFRX_CR_INSEL_MASK GENMASK(18, PDIFRX_CR_INSEL_SHIFT) +#define SPDIFRX_CR_INSELSET(x) ((x) << SPDIFRX_CR_INSEL_SHIFT) + +#define SPDIFRX_CR_CKSEN_SHIFT 20 +#define SPDIFRX_CR_CKSEN BIT(20) +#define SPDIFRX_CR_CKSBKPEN BIT(21) + +/* Bit definition for SPDIFRX_IMR register */ +#define SPDIFRX_IMR_RXNEI BIT(0) +#define SPDIFRX_IMR_CSRNEIE BIT(1) +#define SPDIFRX_IMR_PERRIE BIT(2) +#define SPDIFRX_IMR_OVRIE BIT(3) +#define SPDIFRX_IMR_SBLKIE BIT(4) +#define SPDIFRX_IMR_SYNCDIE BIT(5) +#define SPDIFRX_IMR_IFEIE BIT(6) + +#define SPDIFRX_XIMR_MASK GENMASK(6, 0) + +/* Bit definition for SPDIFRX_SR register */ +#define SPDIFRX_SR_RXNE BIT(0) +#define SPDIFRX_SR_CSRNE BIT(1) +#define SPDIFRX_SR_PERR BIT(2) +#define SPDIFRX_SR_OVR BIT(3) +#define SPDIFRX_SR_SBD BIT(4) +#define SPDIFRX_SR_SYNCD BIT(5) +#define SPDIFRX_SR_FERR BIT(6) +#define SPDIFRX_SR_SERR BIT(7) +#define SPDIFRX_SR_TERR BIT(8) + +#define SPDIFRX_SR_WIDTH5_SHIFT 16 +#define SPDIFRX_SR_WIDTH5_MASK GENMASK(30, PDIFRX_SR_WIDTH5_SHIFT) +#define SPDIFRX_SR_WIDTH5SET(x) ((x) << SPDIFRX_SR_WIDTH5_SHIFT) + +/* Bit definition for SPDIFRX_IFCR register */ +#define SPDIFRX_IFCR_PERRCF BIT(2) +#define SPDIFRX_IFCR_OVRCF BIT(3) +#define SPDIFRX_IFCR_SBDCF BIT(4) +#define SPDIFRX_IFCR_SYNCDCF BIT(5) + +#define SPDIFRX_XIFCR_MASK GENMASK(5, 2) + +/* Bit definition for SPDIFRX_DR register (DRFMT = 0b00) */ +#define SPDIFRX_DR0_DR_SHIFT 0 +#define SPDIFRX_DR0_DR_MASK GENMASK(23, SPDIFRX_DR0_DR_SHIFT) +#define SPDIFRX_DR0_DRSET(x) ((x) << SPDIFRX_DR0_DR_SHIFT) + +#define SPDIFRX_DR0_PE BIT(24) + +#define SPDIFRX_DR0_V BIT(25) +#define SPDIFRX_DR0_U BIT(26) +#define SPDIFRX_DR0_C BIT(27) + +#define SPDIFRX_DR0_PT_SHIFT 28 +#define SPDIFRX_DR0_PT_MASK GENMASK(29, SPDIFRX_DR0_PT_SHIFT) +#define SPDIFRX_DR0_PTSET(x) ((x) << SPDIFRX_DR0_PT_SHIFT) + +/* Bit definition for SPDIFRX_DR register (DRFMT = 0b01) */ +#define SPDIFRX_DR1_PE BIT(0) +#define SPDIFRX_DR1_V BIT(1) +#define SPDIFRX_DR1_U BIT(2) +#define SPDIFRX_DR1_C BIT(3) + +#define SPDIFRX_DR1_PT_SHIFT 4 +#define SPDIFRX_DR1_PT_MASK GENMASK(5, SPDIFRX_DR1_PT_SHIFT) +#define SPDIFRX_DR1_PTSET(x) ((x) << SPDIFRX_DR1_PT_SHIFT) + +#define SPDIFRX_DR1_DR_SHIFT 8 +#define SPDIFRX_DR1_DR_MASK GENMASK(31, SPDIFRX_DR1_DR_SHIFT) +#define SPDIFRX_DR1_DRSET(x) ((x) << SPDIFRX_DR1_DR_SHIFT) + +/* Bit definition for SPDIFRX_DR register (DRFMT = 0b10) */ +#define SPDIFRX_DR1_DRNL1_SHIFT 0 +#define SPDIFRX_DR1_DRNL1_MASK GENMASK(15, SPDIFRX_DR1_DRNL1_SHIFT) +#define SPDIFRX_DR1_DRNL1SET(x) ((x) << SPDIFRX_DR1_DRNL1_SHIFT) + +#define SPDIFRX_DR1_DRNL2_SHIFT 16 +#define SPDIFRX_DR1_DRNL2_MASK GENMASK(31, SPDIFRX_DR1_DRNL2_SHIFT) +#define SPDIFRX_DR1_DRNL2SET(x) ((x) << SPDIFRX_DR1_DRNL2_SHIFT) + +/* Bit definition for SPDIFRX_CSR register */ +#define SPDIFRX_CSR_USR_SHIFT 0 +#define SPDIFRX_CSR_USR_MASK GENMASK(15, SPDIFRX_CSR_USR_SHIFT) +#define SPDIFRX_CSR_USRGET(x) (((x) & SPDIFRX_CSR_USR_MASK)\ + >> SPDIFRX_CSR_USR_SHIFT) + +#define SPDIFRX_CSR_CS_SHIFT 16 +#define SPDIFRX_CSR_CS_MASK GENMASK(23, SPDIFRX_CSR_CS_SHIFT) +#define SPDIFRX_CSR_CSGET(x) (((x) & SPDIFRX_CSR_CS_MASK)\ + >> SPDIFRX_CSR_CS_SHIFT) + +#define SPDIFRX_CSR_SOB BIT(24) + +/* Bit definition for SPDIFRX_DIR register */ +#define SPDIFRX_DIR_THI_SHIFT 0 +#define SPDIFRX_DIR_THI_MASK GENMASK(12, SPDIFRX_DIR_THI_SHIFT) +#define SPDIFRX_DIR_THI_SET(x) ((x) << SPDIFRX_DIR_THI_SHIFT) + +#define SPDIFRX_DIR_TLO_SHIFT 16 +#define SPDIFRX_DIR_TLO_MASK GENMASK(28, SPDIFRX_DIR_TLO_SHIFT) +#define SPDIFRX_DIR_TLO_SET(x) ((x) << SPDIFRX_DIR_TLO_SHIFT) + +#define SPDIFRX_SPDIFEN_DISABLE 0x0 +#define SPDIFRX_SPDIFEN_SYNC 0x1 +#define SPDIFRX_SPDIFEN_ENABLE 0x3 + +#define SPDIFRX_IN1 0x1 +#define SPDIFRX_IN2 0x2 +#define SPDIFRX_IN3 0x3 +#define SPDIFRX_IN4 0x4 +#define SPDIFRX_IN5 0x5 +#define SPDIFRX_IN6 0x6 +#define SPDIFRX_IN7 0x7 +#define SPDIFRX_IN8 0x8 + +#define SPDIFRX_NBTR_NONE 0x0 +#define SPDIFRX_NBTR_3 0x1 +#define SPDIFRX_NBTR_15 0x2 +#define SPDIFRX_NBTR_63 0x3 + +#define SPDIFRX_DRFMT_RIGHT 0x0 +#define SPDIFRX_DRFMT_LEFT 0x1 +#define SPDIFRX_DRFMT_PACKED 0x2 + +/* 192 CS bits in S/PDIF frame. i.e 24 CS bytes */ +#define SPDIFRX_CS_BYTES_NB 24 +#define SPDIFRX_UB_BYTES_NB 48 + +/* + * CSR register is retrieved as a 32 bits word + * It contains 1 channel status byte and 2 user data bytes + * 2 S/PDIF frames are acquired to get all CS/UB bits + */ +#define SPDIFRX_CSR_BUF_LENGTH (SPDIFRX_CS_BYTES_NB * 4 * 2) + +/** + * struct stm32_spdifrx_data - private data of SPDIFRX + * @pdev: device data pointer + * @base: mmio register base virtual address + * @regmap: SPDIFRX register map pointer + * @regmap_conf: SPDIFRX register map configuration pointer + * @cs_completion: channel status retrieving completion + * @kclk: kernel clock feeding the SPDIFRX clock generator + * @dma_params: dma configuration data for rx channel + * @substream: PCM substream data pointer + * @dmab: dma buffer info pointer + * @ctrl_chan: dma channel for S/PDIF control bits + * @desc:dma async transaction descriptor + * @slave_config: dma slave channel runtime config pointer + * @phys_addr: SPDIFRX registers physical base address + * @lock: synchronization enabling lock + * @irq_lock: prevent race condition with IRQ on stream state + * @cs: channel status buffer + * @ub: user data buffer + * @irq: SPDIFRX interrupt line + * @refcount: keep count of opened DMA channels + */ +struct stm32_spdifrx_data { + struct platform_device *pdev; + void __iomem *base; + struct regmap *regmap; + const struct regmap_config *regmap_conf; + struct completion cs_completion; + struct clk *kclk; + struct snd_dmaengine_dai_dma_data dma_params; + struct snd_pcm_substream *substream; + struct snd_dma_buffer *dmab; + struct dma_chan *ctrl_chan; + struct dma_async_tx_descriptor *desc; + struct dma_slave_config slave_config; + dma_addr_t phys_addr; + spinlock_t lock; /* Sync enabling lock */ + spinlock_t irq_lock; /* Prevent race condition on stream state */ + unsigned char cs[SPDIFRX_CS_BYTES_NB]; + unsigned char ub[SPDIFRX_UB_BYTES_NB]; + int irq; + int refcount; +}; + +static void stm32_spdifrx_dma_complete(void *data) +{ + struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)data; + struct platform_device *pdev = spdifrx->pdev; + u32 *p_start = (u32 *)spdifrx->dmab->area; + u32 *p_end = p_start + (2 * SPDIFRX_CS_BYTES_NB) - 1; + u32 *ptr = p_start; + u16 *ub_ptr = (short *)spdifrx->ub; + int i = 0; + + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_CBDMAEN, + (unsigned int)~SPDIFRX_CR_CBDMAEN); + + if (!spdifrx->dmab->area) + return; + + while (ptr <= p_end) { + if (*ptr & SPDIFRX_CSR_SOB) + break; + ptr++; + } + + if (ptr > p_end) { + dev_err(&pdev->dev, "Start of S/PDIF block not found\n"); + return; + } + + while (i < SPDIFRX_CS_BYTES_NB) { + spdifrx->cs[i] = (unsigned char)SPDIFRX_CSR_CSGET(*ptr); + *ub_ptr++ = SPDIFRX_CSR_USRGET(*ptr++); + if (ptr > p_end) { + dev_err(&pdev->dev, "Failed to get channel status\n"); + return; + } + i++; + } + + complete(&spdifrx->cs_completion); +} + +static int stm32_spdifrx_dma_ctrl_start(struct stm32_spdifrx_data *spdifrx) +{ + dma_cookie_t cookie; + int err; + + spdifrx->desc = dmaengine_prep_slave_single(spdifrx->ctrl_chan, + spdifrx->dmab->addr, + SPDIFRX_CSR_BUF_LENGTH, + DMA_DEV_TO_MEM, + DMA_CTRL_ACK); + if (!spdifrx->desc) + return -EINVAL; + + spdifrx->desc->callback = stm32_spdifrx_dma_complete; + spdifrx->desc->callback_param = spdifrx; + cookie = dmaengine_submit(spdifrx->desc); + err = dma_submit_error(cookie); + if (err) + return -EINVAL; + + dma_async_issue_pending(spdifrx->ctrl_chan); + + return 0; +} + +static void stm32_spdifrx_dma_ctrl_stop(struct stm32_spdifrx_data *spdifrx) +{ + dmaengine_terminate_async(spdifrx->ctrl_chan); +} + +static int stm32_spdifrx_start_sync(struct stm32_spdifrx_data *spdifrx) +{ + int cr, cr_mask, imr, ret; + unsigned long flags; + + /* Enable IRQs */ + imr = SPDIFRX_IMR_IFEIE | SPDIFRX_IMR_SYNCDIE | SPDIFRX_IMR_PERRIE; + ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, imr, imr); + if (ret) + return ret; + + spin_lock_irqsave(&spdifrx->lock, flags); + + spdifrx->refcount++; + + regmap_read(spdifrx->regmap, STM32_SPDIFRX_CR, &cr); + + if (!(cr & SPDIFRX_CR_SPDIFEN_MASK)) { + /* + * Start sync if SPDIFRX is still in idle state. + * SPDIFRX reception enabled when sync done + */ + dev_dbg(&spdifrx->pdev->dev, "start synchronization\n"); + + /* + * SPDIFRX configuration: + * Wait for activity before starting sync process. This avoid + * to issue sync errors when spdif signal is missing on input. + * Preamble, CS, user, validity and parity error bits not copied + * to DR register. + */ + cr = SPDIFRX_CR_WFA | SPDIFRX_CR_PMSK | SPDIFRX_CR_VMSK | + SPDIFRX_CR_CUMSK | SPDIFRX_CR_PTMSK | SPDIFRX_CR_RXSTEO; + cr_mask = cr; + + cr |= SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_SYNC); + cr_mask |= SPDIFRX_CR_SPDIFEN_MASK; + ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + cr_mask, cr); + if (ret < 0) + dev_err(&spdifrx->pdev->dev, + "Failed to start synchronization\n"); + } + + spin_unlock_irqrestore(&spdifrx->lock, flags); + + return ret; +} + +static void stm32_spdifrx_stop(struct stm32_spdifrx_data *spdifrx) +{ + int cr, cr_mask, reg; + unsigned long flags; + + spin_lock_irqsave(&spdifrx->lock, flags); + + if (--spdifrx->refcount) { + spin_unlock_irqrestore(&spdifrx->lock, flags); + return; + } + + cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE); + cr_mask = SPDIFRX_CR_SPDIFEN_MASK | SPDIFRX_CR_RXDMAEN; + + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, cr_mask, cr); + + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, + SPDIFRX_XIMR_MASK, 0); + + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR, + SPDIFRX_XIFCR_MASK, SPDIFRX_XIFCR_MASK); + + /* dummy read to clear CSRNE and RXNE in status register */ + regmap_read(spdifrx->regmap, STM32_SPDIFRX_DR, ®); + regmap_read(spdifrx->regmap, STM32_SPDIFRX_CSR, ®); + + spin_unlock_irqrestore(&spdifrx->lock, flags); +} + +static int stm32_spdifrx_dma_ctrl_register(struct device *dev, + struct stm32_spdifrx_data *spdifrx) +{ + int ret; + + spdifrx->ctrl_chan = dma_request_chan(dev, "rx-ctrl"); + if (IS_ERR(spdifrx->ctrl_chan)) { + dev_err(dev, "dma_request_slave_channel failed\n"); + return PTR_ERR(spdifrx->ctrl_chan); + } + + spdifrx->dmab = devm_kzalloc(dev, sizeof(struct snd_dma_buffer), + GFP_KERNEL); + if (!spdifrx->dmab) + return -ENOMEM; + + spdifrx->dmab->dev.type = SNDRV_DMA_TYPE_DEV_IRAM; + spdifrx->dmab->dev.dev = dev; + ret = snd_dma_alloc_pages(spdifrx->dmab->dev.type, dev, + SPDIFRX_CSR_BUF_LENGTH, spdifrx->dmab); + if (ret < 0) { + dev_err(dev, "snd_dma_alloc_pages returned error %d\n", ret); + return ret; + } + + spdifrx->slave_config.direction = DMA_DEV_TO_MEM; + spdifrx->slave_config.src_addr = (dma_addr_t)(spdifrx->phys_addr + + STM32_SPDIFRX_CSR); + spdifrx->slave_config.dst_addr = spdifrx->dmab->addr; + spdifrx->slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + spdifrx->slave_config.src_maxburst = 1; + + ret = dmaengine_slave_config(spdifrx->ctrl_chan, + &spdifrx->slave_config); + if (ret < 0) { + dev_err(dev, "dmaengine_slave_config returned error %d\n", ret); + spdifrx->ctrl_chan = NULL; + } + + return ret; +}; + +static const char * const spdifrx_enum_input[] = { + "in0", "in1", "in2", "in3" +}; + +/* By default CS bits are retrieved from channel A */ +static const char * const spdifrx_enum_cs_channel[] = { + "A", "B" +}; + +static SOC_ENUM_SINGLE_DECL(ctrl_enum_input, + STM32_SPDIFRX_CR, SPDIFRX_CR_INSEL_SHIFT, + spdifrx_enum_input); + +static SOC_ENUM_SINGLE_DECL(ctrl_enum_cs_channel, + STM32_SPDIFRX_CR, SPDIFRX_CR_CHSEL_SHIFT, + spdifrx_enum_cs_channel); + +static int stm32_spdifrx_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; + uinfo->count = 1; + + return 0; +} + +static int stm32_spdifrx_ub_info(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_info *uinfo) +{ + uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958; + uinfo->count = 1; + + return 0; +} + +static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx) +{ + int ret = 0; + + memset(spdifrx->cs, 0, SPDIFRX_CS_BYTES_NB); + memset(spdifrx->ub, 0, SPDIFRX_UB_BYTES_NB); + + ret = stm32_spdifrx_dma_ctrl_start(spdifrx); + if (ret < 0) + return ret; + + ret = clk_prepare_enable(spdifrx->kclk); + if (ret) { + dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret); + return ret; + } + + ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_CBDMAEN, SPDIFRX_CR_CBDMAEN); + if (ret < 0) + goto end; + + ret = stm32_spdifrx_start_sync(spdifrx); + if (ret < 0) + goto end; + + if (wait_for_completion_interruptible_timeout(&spdifrx->cs_completion, + msecs_to_jiffies(100)) + <= 0) { + dev_err(&spdifrx->pdev->dev, "Failed to get control data\n"); + ret = -EAGAIN; + } + + stm32_spdifrx_stop(spdifrx); + stm32_spdifrx_dma_ctrl_stop(spdifrx); + +end: + clk_disable_unprepare(spdifrx->kclk); + + return ret; +} + +static int stm32_spdifrx_capture_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + + stm32_spdifrx_get_ctrl_data(spdifrx); + + ucontrol->value.iec958.status[0] = spdifrx->cs[0]; + ucontrol->value.iec958.status[1] = spdifrx->cs[1]; + ucontrol->value.iec958.status[2] = spdifrx->cs[2]; + ucontrol->value.iec958.status[3] = spdifrx->cs[3]; + ucontrol->value.iec958.status[4] = spdifrx->cs[4]; + + return 0; +} + +static int stm32_spdif_user_bits_get(struct snd_kcontrol *kcontrol, + struct snd_ctl_elem_value *ucontrol) +{ + struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol); + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + + stm32_spdifrx_get_ctrl_data(spdifrx); + + ucontrol->value.iec958.status[0] = spdifrx->ub[0]; + ucontrol->value.iec958.status[1] = spdifrx->ub[1]; + ucontrol->value.iec958.status[2] = spdifrx->ub[2]; + ucontrol->value.iec958.status[3] = spdifrx->ub[3]; + ucontrol->value.iec958.status[4] = spdifrx->ub[4]; + + return 0; +} + +static struct snd_kcontrol_new stm32_spdifrx_iec_ctrls[] = { + /* Channel status control */ + { + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT), + .access = SNDRV_CTL_ELEM_ACCESS_READ | + SNDRV_CTL_ELEM_ACCESS_VOLATILE, + .info = stm32_spdifrx_info, + .get = stm32_spdifrx_capture_get, + }, + /* User bits control */ + { + .iface = SNDRV_CTL_ELEM_IFACE_PCM, + .name = "IEC958 User Bit Capture Default", + .access = SNDRV_CTL_ELEM_ACCESS_READ | + SNDRV_CTL_ELEM_ACCESS_VOLATILE, + .info = stm32_spdifrx_ub_info, + .get = stm32_spdif_user_bits_get, + }, +}; + +static struct snd_kcontrol_new stm32_spdifrx_ctrls[] = { + SOC_ENUM("SPDIFRX input", ctrl_enum_input), + SOC_ENUM("SPDIFRX CS channel", ctrl_enum_cs_channel), +}; + +static int stm32_spdifrx_dai_register_ctrls(struct snd_soc_dai *cpu_dai) +{ + int ret; + + ret = snd_soc_add_dai_controls(cpu_dai, stm32_spdifrx_iec_ctrls, + ARRAY_SIZE(stm32_spdifrx_iec_ctrls)); + if (ret < 0) + return ret; + + return snd_soc_add_component_controls(cpu_dai->component, + stm32_spdifrx_ctrls, + ARRAY_SIZE(stm32_spdifrx_ctrls)); +} + +static int stm32_spdifrx_dai_probe(struct snd_soc_dai *cpu_dai) +{ + struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(cpu_dai->dev); + + spdifrx->dma_params.addr = (dma_addr_t)(spdifrx->phys_addr + + STM32_SPDIFRX_DR); + spdifrx->dma_params.maxburst = 1; + + snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params); + + return stm32_spdifrx_dai_register_ctrls(cpu_dai); +} + +static bool stm32_spdifrx_readable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM32_SPDIFRX_CR: + case STM32_SPDIFRX_IMR: + case STM32_SPDIFRX_SR: + case STM32_SPDIFRX_IFCR: + case STM32_SPDIFRX_DR: + case STM32_SPDIFRX_CSR: + case STM32_SPDIFRX_DIR: + return true; + default: + return false; + } +} + +static bool stm32_spdifrx_volatile_reg(struct device *dev, unsigned int reg) +{ + if (reg == STM32_SPDIFRX_DR) + return true; + + return false; +} + +static bool stm32_spdifrx_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case STM32_SPDIFRX_CR: + case STM32_SPDIFRX_IMR: + case STM32_SPDIFRX_IFCR: + return true; + default: + return false; + } +} + +static const struct regmap_config stm32_h7_spdifrx_regmap_conf = { + .reg_bits = 32, + .reg_stride = 4, + .val_bits = 32, + .max_register = STM32_SPDIFRX_DIR, + .readable_reg = stm32_spdifrx_readable_reg, + .volatile_reg = stm32_spdifrx_volatile_reg, + .writeable_reg = stm32_spdifrx_writeable_reg, + .fast_io = true, +}; + +static irqreturn_t stm32_spdifrx_isr(int irq, void *devid) +{ + struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)devid; + struct platform_device *pdev = spdifrx->pdev; + unsigned int cr, mask, sr, imr; + unsigned int flags; + int err = 0, err_xrun = 0; + + regmap_read(spdifrx->regmap, STM32_SPDIFRX_SR, &sr); + regmap_read(spdifrx->regmap, STM32_SPDIFRX_IMR, &imr); + + mask = imr & SPDIFRX_XIMR_MASK; + /* SERR, TERR, FERR IRQs are generated if IFEIE is set */ + if (mask & SPDIFRX_IMR_IFEIE) + mask |= (SPDIFRX_IMR_IFEIE << 1) | (SPDIFRX_IMR_IFEIE << 2); + + flags = sr & mask; + if (!flags) { + dev_err(&pdev->dev, "Unexpected IRQ. rflags=%#x, imr=%#x\n", + sr, imr); + return IRQ_NONE; + } + + /* Clear IRQs */ + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR, + SPDIFRX_XIFCR_MASK, flags); + + if (flags & SPDIFRX_SR_PERR) { + dev_dbg(&pdev->dev, "Parity error\n"); + err_xrun = 1; + } + + if (flags & SPDIFRX_SR_OVR) { + dev_dbg(&pdev->dev, "Overrun error\n"); + err_xrun = 1; + } + + if (flags & SPDIFRX_SR_SBD) + dev_dbg(&pdev->dev, "Synchronization block detected\n"); + + if (flags & SPDIFRX_SR_SYNCD) { + dev_dbg(&pdev->dev, "Synchronization done\n"); + + /* Enable spdifrx */ + cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_ENABLE); + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_SPDIFEN_MASK, cr); + } + + if (flags & SPDIFRX_SR_FERR) { + dev_dbg(&pdev->dev, "Frame error\n"); + err = 1; + } + + if (flags & SPDIFRX_SR_SERR) { + dev_dbg(&pdev->dev, "Synchronization error\n"); + err = 1; + } + + if (flags & SPDIFRX_SR_TERR) { + dev_dbg(&pdev->dev, "Timeout error\n"); + err = 1; + } + + if (err) { + /* SPDIFRX in STATE_STOP. Disable SPDIFRX to clear errors */ + cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE); + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_SPDIFEN_MASK, cr); + + spin_lock(&spdifrx->irq_lock); + if (spdifrx->substream) + snd_pcm_stop(spdifrx->substream, + SNDRV_PCM_STATE_DISCONNECTED); + spin_unlock(&spdifrx->irq_lock); + + return IRQ_HANDLED; + } + + spin_lock(&spdifrx->irq_lock); + if (err_xrun && spdifrx->substream) + snd_pcm_stop_xrun(spdifrx->substream); + spin_unlock(&spdifrx->irq_lock); + + return IRQ_HANDLED; +} + +static int stm32_spdifrx_startup(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long flags; + int ret; + + spin_lock_irqsave(&spdifrx->irq_lock, flags); + spdifrx->substream = substream; + spin_unlock_irqrestore(&spdifrx->irq_lock, flags); + + ret = clk_prepare_enable(spdifrx->kclk); + if (ret) + dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret); + + return ret; +} + +static int stm32_spdifrx_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + int data_size = params_width(params); + int fmt; + + switch (data_size) { + case 16: + fmt = SPDIFRX_DRFMT_PACKED; + break; + case 32: + fmt = SPDIFRX_DRFMT_LEFT; + break; + default: + dev_err(&spdifrx->pdev->dev, "Unexpected data format\n"); + return -EINVAL; + } + + /* + * Set buswidth to 4 bytes for all data formats. + * Packed format: transfer 2 x 2 bytes samples + * Left format: transfer 1 x 3 bytes samples + 1 dummy byte + */ + spdifrx->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params); + + return regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_DRFMT_MASK, + SPDIFRX_CR_DRFMTSET(fmt)); +} + +static int stm32_spdifrx_trigger(struct snd_pcm_substream *substream, int cmd, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + int ret = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + case SNDRV_PCM_TRIGGER_RESUME: + case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, + SPDIFRX_IMR_OVRIE, SPDIFRX_IMR_OVRIE); + + regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, + SPDIFRX_CR_RXDMAEN, SPDIFRX_CR_RXDMAEN); + + ret = stm32_spdifrx_start_sync(spdifrx); + break; + case SNDRV_PCM_TRIGGER_SUSPEND: + case SNDRV_PCM_TRIGGER_PAUSE_PUSH: + case SNDRV_PCM_TRIGGER_STOP: + stm32_spdifrx_stop(spdifrx); + break; + default: + return -EINVAL; + } + + return ret; +} + +static void stm32_spdifrx_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *cpu_dai) +{ + struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai); + unsigned long flags; + + spin_lock_irqsave(&spdifrx->irq_lock, flags); + spdifrx->substream = NULL; + spin_unlock_irqrestore(&spdifrx->irq_lock, flags); + + clk_disable_unprepare(spdifrx->kclk); +} + +static const struct snd_soc_dai_ops stm32_spdifrx_pcm_dai_ops = { + .startup = stm32_spdifrx_startup, + .hw_params = stm32_spdifrx_hw_params, + .trigger = stm32_spdifrx_trigger, + .shutdown = stm32_spdifrx_shutdown, +}; + +static struct snd_soc_dai_driver stm32_spdifrx_dai[] = { + { + .probe = stm32_spdifrx_dai_probe, + .capture = { + .stream_name = "CPU-Capture", + .channels_min = 1, + .channels_max = 2, + .rates = SNDRV_PCM_RATE_8000_192000, + .formats = SNDRV_PCM_FMTBIT_S32_LE | + SNDRV_PCM_FMTBIT_S16_LE, + }, + .ops = &stm32_spdifrx_pcm_dai_ops, + } +}; + +static const struct snd_pcm_hardware stm32_spdifrx_pcm_hw = { + .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP, + .buffer_bytes_max = 8 * PAGE_SIZE, + .period_bytes_max = 2048, /* MDMA constraint */ + .periods_min = 2, + .periods_max = 8, +}; + +static const struct snd_soc_component_driver stm32_spdifrx_component = { + .name = "stm32-spdifrx", +}; + +static const struct snd_dmaengine_pcm_config stm32_spdifrx_pcm_config = { + .pcm_hardware = &stm32_spdifrx_pcm_hw, + .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config, +}; + +static const struct of_device_id stm32_spdifrx_ids[] = { + { + .compatible = "st,stm32h7-spdifrx", + .data = &stm32_h7_spdifrx_regmap_conf + }, + {} +}; + +static int stm32_spdifrx_parse_of(struct platform_device *pdev, + struct stm32_spdifrx_data *spdifrx) +{ + struct device_node *np = pdev->dev.of_node; + const struct of_device_id *of_id; + struct resource *res; + + if (!np) + return -ENODEV; + + of_id = of_match_device(stm32_spdifrx_ids, &pdev->dev); + if (of_id) + spdifrx->regmap_conf = + (const struct regmap_config *)of_id->data; + else + return -EINVAL; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + spdifrx->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(spdifrx->base)) + return PTR_ERR(spdifrx->base); + + spdifrx->phys_addr = res->start; + + spdifrx->kclk = devm_clk_get(&pdev->dev, "kclk"); + if (IS_ERR(spdifrx->kclk)) { + dev_err(&pdev->dev, "Could not get kclk\n"); + return PTR_ERR(spdifrx->kclk); + } + + spdifrx->irq = platform_get_irq(pdev, 0); + if (spdifrx->irq < 0) { + dev_err(&pdev->dev, "No irq for node %s\n", pdev->name); + return spdifrx->irq; + } + + return 0; +} + +static int stm32_spdifrx_probe(struct platform_device *pdev) +{ + struct stm32_spdifrx_data *spdifrx; + struct reset_control *rst; + const struct snd_dmaengine_pcm_config *pcm_config = NULL; + int ret; + + spdifrx = devm_kzalloc(&pdev->dev, sizeof(*spdifrx), GFP_KERNEL); + if (!spdifrx) + return -ENOMEM; + + spdifrx->pdev = pdev; + init_completion(&spdifrx->cs_completion); + spin_lock_init(&spdifrx->lock); + spin_lock_init(&spdifrx->irq_lock); + + platform_set_drvdata(pdev, spdifrx); + + ret = stm32_spdifrx_parse_of(pdev, spdifrx); + if (ret) + return ret; + + spdifrx->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "kclk", + spdifrx->base, + spdifrx->regmap_conf); + if (IS_ERR(spdifrx->regmap)) { + dev_err(&pdev->dev, "Regmap init failed\n"); + return PTR_ERR(spdifrx->regmap); + } + + ret = devm_request_irq(&pdev->dev, spdifrx->irq, stm32_spdifrx_isr, 0, + dev_name(&pdev->dev), spdifrx); + if (ret) { + dev_err(&pdev->dev, "IRQ request returned %d\n", ret); + return ret; + } + + rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (!IS_ERR(rst)) { + reset_control_assert(rst); + udelay(2); + reset_control_deassert(rst); + } + + ret = devm_snd_soc_register_component(&pdev->dev, + &stm32_spdifrx_component, + stm32_spdifrx_dai, + ARRAY_SIZE(stm32_spdifrx_dai)); + if (ret) + return ret; + + ret = stm32_spdifrx_dma_ctrl_register(&pdev->dev, spdifrx); + if (ret) + goto error; + + pcm_config = &stm32_spdifrx_pcm_config; + ret = devm_snd_dmaengine_pcm_register(&pdev->dev, pcm_config, 0); + if (ret) { + dev_err(&pdev->dev, "PCM DMA register returned %d\n", ret); + goto error; + } + + return 0; + +error: + if (!IS_ERR(spdifrx->ctrl_chan)) + dma_release_channel(spdifrx->ctrl_chan); + if (spdifrx->dmab) + snd_dma_free_pages(spdifrx->dmab); + + return ret; +} + +static int stm32_spdifrx_remove(struct platform_device *pdev) +{ + struct stm32_spdifrx_data *spdifrx = platform_get_drvdata(pdev); + + if (spdifrx->ctrl_chan) + dma_release_channel(spdifrx->ctrl_chan); + + if (spdifrx->dmab) + snd_dma_free_pages(spdifrx->dmab); + + return 0; +} + +MODULE_DEVICE_TABLE(of, stm32_spdifrx_ids); + +static struct platform_driver stm32_spdifrx_driver = { + .driver = { + .name = "st,stm32-spdifrx", + .of_match_table = stm32_spdifrx_ids, + }, + .probe = stm32_spdifrx_probe, + .remove = stm32_spdifrx_remove, +}; + +module_platform_driver(stm32_spdifrx_driver); + +MODULE_DESCRIPTION("STM32 Soc spdifrx Interface"); +MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>"); +MODULE_ALIAS("platform:stm32-spdifrx"); +MODULE_LICENSE("GPL v2"); |