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linux/sound/soc/atmel/mchp-i2s-mcc.c
Codrin Ciubotariu 0f6fc97501
ASoC: mchp-i2s-mcc: Wait for RX/TX RDY only if controller is running 
Since hw_free() can be called multiple times and not just after a stop
trigger command, we should check whether the RX or TX ready interrupt was
truly enabled previously. For this, we assure that the condition of the
wait event is always true, except when RX/TX interrupts are enabled.

Fixes: 7e0cdf545a55 ("ASoC: mchp-i2s-mcc: add driver for I2SC Multi-Channel Controller")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Link: https://lore.kernel.org/r/20190820162411.24836-3-codrin.ciubotariu@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2019-08-20 18:36:51 +01:00

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// SPDX-License-Identifier: GPL-2.0
//
// Driver for Microchip I2S Multi-channel controller
//
// Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries
//
// Author: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/mfd/syscon.h>
#include <linux/lcm.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>
/*
* ---- I2S Controller Register map ----
*/
#define MCHP_I2SMCC_CR 0x0000 /* Control Register */
#define MCHP_I2SMCC_MRA 0x0004 /* Mode Register A */
#define MCHP_I2SMCC_MRB 0x0008 /* Mode Register B */
#define MCHP_I2SMCC_SR 0x000C /* Status Register */
#define MCHP_I2SMCC_IERA 0x0010 /* Interrupt Enable Register A */
#define MCHP_I2SMCC_IDRA 0x0014 /* Interrupt Disable Register A */
#define MCHP_I2SMCC_IMRA 0x0018 /* Interrupt Mask Register A */
#define MCHP_I2SMCC_ISRA 0X001C /* Interrupt Status Register A */
#define MCHP_I2SMCC_IERB 0x0020 /* Interrupt Enable Register B */
#define MCHP_I2SMCC_IDRB 0x0024 /* Interrupt Disable Register B */
#define MCHP_I2SMCC_IMRB 0x0028 /* Interrupt Mask Register B */
#define MCHP_I2SMCC_ISRB 0X002C /* Interrupt Status Register B */
#define MCHP_I2SMCC_RHR 0x0030 /* Receiver Holding Register */
#define MCHP_I2SMCC_THR 0x0034 /* Transmitter Holding Register */
#define MCHP_I2SMCC_RHL0R 0x0040 /* Receiver Holding Left 0 Register */
#define MCHP_I2SMCC_RHR0R 0x0044 /* Receiver Holding Right 0 Register */
#define MCHP_I2SMCC_RHL1R 0x0048 /* Receiver Holding Left 1 Register */
#define MCHP_I2SMCC_RHR1R 0x004C /* Receiver Holding Right 1 Register */
#define MCHP_I2SMCC_RHL2R 0x0050 /* Receiver Holding Left 2 Register */
#define MCHP_I2SMCC_RHR2R 0x0054 /* Receiver Holding Right 2 Register */
#define MCHP_I2SMCC_RHL3R 0x0058 /* Receiver Holding Left 3 Register */
#define MCHP_I2SMCC_RHR3R 0x005C /* Receiver Holding Right 3 Register */
#define MCHP_I2SMCC_THL0R 0x0060 /* Transmitter Holding Left 0 Register */
#define MCHP_I2SMCC_THR0R 0x0064 /* Transmitter Holding Right 0 Register */
#define MCHP_I2SMCC_THL1R 0x0068 /* Transmitter Holding Left 1 Register */
#define MCHP_I2SMCC_THR1R 0x006C /* Transmitter Holding Right 1 Register */
#define MCHP_I2SMCC_THL2R 0x0070 /* Transmitter Holding Left 2 Register */
#define MCHP_I2SMCC_THR2R 0x0074 /* Transmitter Holding Right 2 Register */
#define MCHP_I2SMCC_THL3R 0x0078 /* Transmitter Holding Left 3 Register */
#define MCHP_I2SMCC_THR3R 0x007C /* Transmitter Holding Right 3 Register */
#define MCHP_I2SMCC_VERSION 0x00FC /* Version Register */
/*
* ---- Control Register (Write-only) ----
*/
#define MCHP_I2SMCC_CR_RXEN BIT(0) /* Receiver Enable */
#define MCHP_I2SMCC_CR_RXDIS BIT(1) /* Receiver Disable */
#define MCHP_I2SMCC_CR_CKEN BIT(2) /* Clock Enable */
#define MCHP_I2SMCC_CR_CKDIS BIT(3) /* Clock Disable */
#define MCHP_I2SMCC_CR_TXEN BIT(4) /* Transmitter Enable */
#define MCHP_I2SMCC_CR_TXDIS BIT(5) /* Transmitter Disable */
#define MCHP_I2SMCC_CR_SWRST BIT(7) /* Software Reset */
/*
* ---- Mode Register A (Read/Write) ----
*/
#define MCHP_I2SMCC_MRA_MODE_MASK GENMASK(0, 0)
#define MCHP_I2SMCC_MRA_MODE_SLAVE (0 << 0)
#define MCHP_I2SMCC_MRA_MODE_MASTER (1 << 0)
#define MCHP_I2SMCC_MRA_DATALENGTH_MASK GENMASK(3, 1)
#define MCHP_I2SMCC_MRA_DATALENGTH_32_BITS (0 << 1)
#define MCHP_I2SMCC_MRA_DATALENGTH_24_BITS (1 << 1)
#define MCHP_I2SMCC_MRA_DATALENGTH_20_BITS (2 << 1)
#define MCHP_I2SMCC_MRA_DATALENGTH_18_BITS (3 << 1)
#define MCHP_I2SMCC_MRA_DATALENGTH_16_BITS (4 << 1)
#define MCHP_I2SMCC_MRA_DATALENGTH_16_BITS_COMPACT (5 << 1)
#define MCHP_I2SMCC_MRA_DATALENGTH_8_BITS (6 << 1)
#define MCHP_I2SMCC_MRA_DATALENGTH_8_BITS_COMPACT (7 << 1)
#define MCHP_I2SMCC_MRA_WIRECFG_MASK GENMASK(5, 4)
#define MCHP_I2SMCC_MRA_WIRECFG_I2S_1_TDM_0 (0 << 4)
#define MCHP_I2SMCC_MRA_WIRECFG_I2S_2_TDM_1 (1 << 4)
#define MCHP_I2SMCC_MRA_WIRECFG_I2S_4_TDM_2 (2 << 4)
#define MCHP_I2SMCC_MRA_WIRECFG_TDM_3 (3 << 4)
#define MCHP_I2SMCC_MRA_FORMAT_MASK GENMASK(7, 6)
#define MCHP_I2SMCC_MRA_FORMAT_I2S (0 << 6)
#define MCHP_I2SMCC_MRA_FORMAT_LJ (1 << 6) /* Left Justified */
#define MCHP_I2SMCC_MRA_FORMAT_TDM (2 << 6)
#define MCHP_I2SMCC_MRA_FORMAT_TDMLJ (3 << 6)
/* Transmitter uses one DMA channel ... */
/* Left audio samples duplicated to right audio channel */
#define MCHP_I2SMCC_MRA_RXMONO BIT(8)
/* I2SDO output of I2SC is internally connected to I2SDI input */
#define MCHP_I2SMCC_MRA_RXLOOP BIT(9)
/* Receiver uses one DMA channel ... */
/* Left audio samples duplicated to right audio channel */
#define MCHP_I2SMCC_MRA_TXMONO BIT(10)
/* x sample transmitted when underrun */
#define MCHP_I2SMCC_MRA_TXSAME_ZERO (0 << 11) /* Zero sample */
#define MCHP_I2SMCC_MRA_TXSAME_PREVIOUS (1 << 11) /* Previous sample */
/* select between peripheral clock and generated clock */
#define MCHP_I2SMCC_MRA_SRCCLK_PCLK (0 << 12)
#define MCHP_I2SMCC_MRA_SRCCLK_GCLK (1 << 12)
/* Number of TDM Channels - 1 */
#define MCHP_I2SMCC_MRA_NBCHAN_MASK GENMASK(15, 13)
#define MCHP_I2SMCC_MRA_NBCHAN(ch) \
((((ch) - 1) << 13) & MCHP_I2SMCC_MRA_NBCHAN_MASK)
/* Selected Clock to I2SMCC Master Clock ratio */
#define MCHP_I2SMCC_MRA_IMCKDIV_MASK GENMASK(21, 16)
#define MCHP_I2SMCC_MRA_IMCKDIV(div) \
(((div) << 16) & MCHP_I2SMCC_MRA_IMCKDIV_MASK)
/* TDM Frame Synchronization */
#define MCHP_I2SMCC_MRA_TDMFS_MASK GENMASK(23, 22)
#define MCHP_I2SMCC_MRA_TDMFS_SLOT (0 << 22)
#define MCHP_I2SMCC_MRA_TDMFS_HALF (1 << 22)
#define MCHP_I2SMCC_MRA_TDMFS_BIT (2 << 22)
/* Selected Clock to I2SMC Serial Clock ratio */
#define MCHP_I2SMCC_MRA_ISCKDIV_MASK GENMASK(29, 24)
#define MCHP_I2SMCC_MRA_ISCKDIV(div) \
(((div) << 24) & MCHP_I2SMCC_MRA_ISCKDIV_MASK)
/* Master Clock mode */
#define MCHP_I2SMCC_MRA_IMCKMODE_MASK GENMASK(30, 30)
/* 0: No master clock generated*/
#define MCHP_I2SMCC_MRA_IMCKMODE_NONE (0 << 30)
/* 1: master clock generated (internally generated clock drives I2SMCK pin) */
#define MCHP_I2SMCC_MRA_IMCKMODE_GEN (1 << 30)
/* Slot Width */
/* 0: slot is 32 bits wide for DATALENGTH = 18/20/24 bits. */
/* 1: slot is 24 bits wide for DATALENGTH = 18/20/24 bits. */
#define MCHP_I2SMCC_MRA_IWS BIT(31)
/*
* ---- Mode Register B (Read/Write) ----
*/
/* all enabled I2S left channels are filled first, then I2S right channels */
#define MCHP_I2SMCC_MRB_CRAMODE_LEFT_FIRST (0 << 0)
/*
* an enabled I2S left channel is filled, then the corresponding right
* channel, until all channels are filled
*/
#define MCHP_I2SMCC_MRB_CRAMODE_REGULAR (1 << 0)
#define MCHP_I2SMCC_MRB_FIFOEN BIT(1)
#define MCHP_I2SMCC_MRB_DMACHUNK_MASK GENMASK(9, 8)
#define MCHP_I2SMCC_MRB_DMACHUNK(no_words) \
(((fls(no_words) - 1) << 8) & MCHP_I2SMCC_MRB_DMACHUNK_MASK)
#define MCHP_I2SMCC_MRB_CLKSEL_MASK GENMASK(16, 16)
#define MCHP_I2SMCC_MRB_CLKSEL_EXT (0 << 16)
#define MCHP_I2SMCC_MRB_CLKSEL_INT (1 << 16)
/*
* ---- Status Registers (Read-only) ----
*/
#define MCHP_I2SMCC_SR_RXEN BIT(0) /* Receiver Enabled */
#define MCHP_I2SMCC_SR_TXEN BIT(4) /* Transmitter Enabled */
/*
* ---- Interrupt Enable/Disable/Mask/Status Registers A ----
*/
#define MCHP_I2SMCC_INT_TXRDY_MASK(ch) GENMASK((ch) - 1, 0)
#define MCHP_I2SMCC_INT_TXRDYCH(ch) BIT(ch)
#define MCHP_I2SMCC_INT_TXUNF_MASK(ch) GENMASK((ch) + 7, 8)
#define MCHP_I2SMCC_INT_TXUNFCH(ch) BIT((ch) + 8)
#define MCHP_I2SMCC_INT_RXRDY_MASK(ch) GENMASK((ch) + 15, 16)
#define MCHP_I2SMCC_INT_RXRDYCH(ch) BIT((ch) + 16)
#define MCHP_I2SMCC_INT_RXOVF_MASK(ch) GENMASK((ch) + 23, 24)
#define MCHP_I2SMCC_INT_RXOVFCH(ch) BIT((ch) + 24)
/*
* ---- Interrupt Enable/Disable/Mask/Status Registers B ----
*/
#define MCHP_I2SMCC_INT_WERR BIT(0)
#define MCHP_I2SMCC_INT_TXFFRDY BIT(8)
#define MCHP_I2SMCC_INT_TXFFEMP BIT(9)
#define MCHP_I2SMCC_INT_RXFFRDY BIT(12)
#define MCHP_I2SMCC_INT_RXFFFUL BIT(13)
/*
* ---- Version Register (Read-only) ----
*/
#define MCHP_I2SMCC_VERSION_MASK GENMASK(11, 0)
#define MCHP_I2SMCC_MAX_CHANNELS 8
#define MCHP_I2MCC_TDM_SLOT_WIDTH 32
static const struct regmap_config mchp_i2s_mcc_regmap_config = {
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = MCHP_I2SMCC_VERSION,
};
struct mchp_i2s_mcc_dev {
struct wait_queue_head wq_txrdy;
struct wait_queue_head wq_rxrdy;
struct device *dev;
struct regmap *regmap;
struct clk *pclk;
struct clk *gclk;
struct snd_dmaengine_dai_dma_data playback;
struct snd_dmaengine_dai_dma_data capture;
unsigned int fmt;
unsigned int sysclk;
unsigned int frame_length;
int tdm_slots;
int channels;
int gclk_use:1;
int gclk_running:1;
int tx_rdy:1;
int rx_rdy:1;
};
static irqreturn_t mchp_i2s_mcc_interrupt(int irq, void *dev_id)
{
struct mchp_i2s_mcc_dev *dev = dev_id;
u32 sra, imra, srb, imrb, pendinga, pendingb, idra = 0;
irqreturn_t ret = IRQ_NONE;
regmap_read(dev->regmap, MCHP_I2SMCC_IMRA, &imra);
regmap_read(dev->regmap, MCHP_I2SMCC_ISRA, &sra);
pendinga = imra & sra;
regmap_read(dev->regmap, MCHP_I2SMCC_IMRB, &imrb);
regmap_read(dev->regmap, MCHP_I2SMCC_ISRB, &srb);
pendingb = imrb & srb;
if (!pendinga && !pendingb)
return IRQ_NONE;
/*
* Tx/Rx ready interrupts are enabled when stopping only, to assure
* availability and to disable clocks if necessary
*/
idra |= pendinga & (MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels) |
MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels));
if (idra)
ret = IRQ_HANDLED;
if ((imra & MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels)) &&
(imra & MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels)) ==
(idra & MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels))) {
dev->tx_rdy = 1;
wake_up_interruptible(&dev->wq_txrdy);
}
if ((imra & MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels)) &&
(imra & MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels)) ==
(idra & MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels))) {
dev->rx_rdy = 1;
wake_up_interruptible(&dev->wq_rxrdy);
}
regmap_write(dev->regmap, MCHP_I2SMCC_IDRA, idra);
return ret;
}
static int mchp_i2s_mcc_set_sysclk(struct snd_soc_dai *dai,
int clk_id, unsigned int freq, int dir)
{
struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
dev_dbg(dev->dev, "%s() clk_id=%d freq=%u dir=%d\n",
__func__, clk_id, freq, dir);
/* We do not need SYSCLK */
if (dir == SND_SOC_CLOCK_IN)
return 0;
dev->sysclk = freq;
return 0;
}
static int mchp_i2s_mcc_set_bclk_ratio(struct snd_soc_dai *dai,
unsigned int ratio)
{
struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
dev_dbg(dev->dev, "%s() ratio=%u\n", __func__, ratio);
dev->frame_length = ratio;
return 0;
}
static int mchp_i2s_mcc_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
{
struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
dev_dbg(dev->dev, "%s() fmt=%#x\n", __func__, fmt);
/* We don't support any kind of clock inversion */
if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF)
return -EINVAL;
/* We can't generate only FSYNC */
if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) == SND_SOC_DAIFMT_CBM_CFS)
return -EINVAL;
/* We can only reconfigure the IP when it's stopped */
if (fmt & SND_SOC_DAIFMT_CONT)
return -EINVAL;
dev->fmt = fmt;
return 0;
}
static int mchp_i2s_mcc_set_dai_tdm_slot(struct snd_soc_dai *dai,
unsigned int tx_mask,
unsigned int rx_mask,
int slots, int slot_width)
{
struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
dev_dbg(dev->dev,
"%s() tx_mask=0x%08x rx_mask=0x%08x slots=%d width=%d\n",
__func__, tx_mask, rx_mask, slots, slot_width);
if (slots < 0 || slots > MCHP_I2SMCC_MAX_CHANNELS ||
slot_width != MCHP_I2MCC_TDM_SLOT_WIDTH)
return -EINVAL;
if (slots) {
/* We do not support daisy chain */
if (rx_mask != GENMASK(slots - 1, 0) ||
rx_mask != tx_mask)
return -EINVAL;
}
dev->tdm_slots = slots;
dev->frame_length = slots * MCHP_I2MCC_TDM_SLOT_WIDTH;
return 0;
}
static int mchp_i2s_mcc_clk_get_rate_diff(struct clk *clk,
unsigned long rate,
struct clk **best_clk,
unsigned long *best_rate,
unsigned long *best_diff_rate)
{
long round_rate;
unsigned int diff_rate;
round_rate = clk_round_rate(clk, rate);
if (round_rate < 0)
return (int)round_rate;
diff_rate = abs(rate - round_rate);
if (diff_rate < *best_diff_rate) {
*best_clk = clk;
*best_diff_rate = diff_rate;
*best_rate = rate;
}
return 0;
}
static int mchp_i2s_mcc_config_divs(struct mchp_i2s_mcc_dev *dev,
unsigned int bclk, unsigned int *mra)
{
unsigned long clk_rate;
unsigned long lcm_rate;
unsigned long best_rate = 0;
unsigned long best_diff_rate = ~0;
unsigned int sysclk;
struct clk *best_clk = NULL;
int ret;
/* For code simplification */
if (!dev->sysclk)
sysclk = bclk;
else
sysclk = dev->sysclk;
/*
* MCLK is Selected CLK / (2 * IMCKDIV),
* BCLK is Selected CLK / (2 * ISCKDIV);
* if IMCKDIV or ISCKDIV are 0, MCLK or BCLK = Selected CLK
*/
lcm_rate = lcm(sysclk, bclk);
if ((lcm_rate / sysclk % 2 == 1 && lcm_rate / sysclk > 2) ||
(lcm_rate / bclk % 2 == 1 && lcm_rate / bclk > 2))
lcm_rate *= 2;
for (clk_rate = lcm_rate;
(clk_rate == sysclk || clk_rate / (sysclk * 2) <= GENMASK(5, 0)) &&
(clk_rate == bclk || clk_rate / (bclk * 2) <= GENMASK(5, 0));
clk_rate += lcm_rate) {
ret = mchp_i2s_mcc_clk_get_rate_diff(dev->gclk, clk_rate,
&best_clk, &best_rate,
&best_diff_rate);
if (ret) {
dev_err(dev->dev, "gclk error for rate %lu: %d",
clk_rate, ret);
} else {
if (!best_diff_rate) {
dev_dbg(dev->dev, "found perfect rate on gclk: %lu\n",
clk_rate);
break;
}
}
ret = mchp_i2s_mcc_clk_get_rate_diff(dev->pclk, clk_rate,
&best_clk, &best_rate,
&best_diff_rate);
if (ret) {
dev_err(dev->dev, "pclk error for rate %lu: %d",
clk_rate, ret);
} else {
if (!best_diff_rate) {
dev_dbg(dev->dev, "found perfect rate on pclk: %lu\n",
clk_rate);
break;
}
}
}
/* check if clocks returned only errors */
if (!best_clk) {
dev_err(dev->dev, "unable to change rate to clocks\n");
return -EINVAL;
}
dev_dbg(dev->dev, "source CLK is %s with rate %lu, diff %lu\n",
best_clk == dev->pclk ? "pclk" : "gclk",
best_rate, best_diff_rate);
/* set the rate */
ret = clk_set_rate(best_clk, best_rate);
if (ret) {
dev_err(dev->dev, "unable to set rate %lu to %s: %d\n",
best_rate, best_clk == dev->pclk ? "PCLK" : "GCLK",
ret);
return ret;
}
/* Configure divisors */
if (dev->sysclk)
*mra |= MCHP_I2SMCC_MRA_IMCKDIV(best_rate / (2 * sysclk));
*mra |= MCHP_I2SMCC_MRA_ISCKDIV(best_rate / (2 * bclk));
if (best_clk == dev->gclk) {
*mra |= MCHP_I2SMCC_MRA_SRCCLK_GCLK;
ret = clk_prepare(dev->gclk);
if (ret < 0)
dev_err(dev->dev, "unable to prepare GCLK: %d\n", ret);
else
dev->gclk_use = 1;
} else {
*mra |= MCHP_I2SMCC_MRA_SRCCLK_PCLK;
dev->gclk_use = 0;
}
return 0;
}
static int mchp_i2s_mcc_is_running(struct mchp_i2s_mcc_dev *dev)
{
u32 sr;
regmap_read(dev->regmap, MCHP_I2SMCC_SR, &sr);
return !!(sr & (MCHP_I2SMCC_SR_TXEN | MCHP_I2SMCC_SR_RXEN));
}
static int mchp_i2s_mcc_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
u32 mra = 0;
u32 mrb = 0;
unsigned int channels = params_channels(params);
unsigned int frame_length = dev->frame_length;
unsigned int bclk_rate;
int set_divs = 0;
int ret;
bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
dev_dbg(dev->dev, "%s() rate=%u format=%#x width=%u channels=%u\n",
__func__, params_rate(params), params_format(params),
params_width(params), params_channels(params));
switch (dev->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
if (dev->tdm_slots) {
dev_err(dev->dev, "I2S with TDM is not supported\n");
return -EINVAL;
}
mra |= MCHP_I2SMCC_MRA_FORMAT_I2S;
break;
case SND_SOC_DAIFMT_LEFT_J:
if (dev->tdm_slots) {
dev_err(dev->dev, "Left-Justified with TDM is not supported\n");
return -EINVAL;
}
mra |= MCHP_I2SMCC_MRA_FORMAT_LJ;
break;
case SND_SOC_DAIFMT_DSP_A:
mra |= MCHP_I2SMCC_MRA_FORMAT_TDM;
break;
default:
dev_err(dev->dev, "unsupported bus format\n");
return -EINVAL;
}
switch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
/* cpu is BCLK and LRC master */
mra |= MCHP_I2SMCC_MRA_MODE_MASTER;
if (dev->sysclk)
mra |= MCHP_I2SMCC_MRA_IMCKMODE_GEN;
set_divs = 1;
break;
case SND_SOC_DAIFMT_CBS_CFM:
/* cpu is BCLK master */
mrb |= MCHP_I2SMCC_MRB_CLKSEL_INT;
set_divs = 1;
/* fall through */
case SND_SOC_DAIFMT_CBM_CFM:
/* cpu is slave */
mra |= MCHP_I2SMCC_MRA_MODE_SLAVE;
if (dev->sysclk)
dev_warn(dev->dev, "Unable to generate MCLK in Slave mode\n");
break;
default:
dev_err(dev->dev, "unsupported master/slave mode\n");
return -EINVAL;
}
if (dev->fmt & (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J)) {
switch (channels) {
case 1:
if (is_playback)
mra |= MCHP_I2SMCC_MRA_TXMONO;
else
mra |= MCHP_I2SMCC_MRA_RXMONO;
break;
case 2:
break;
default:
dev_err(dev->dev, "unsupported number of audio channels\n");
return -EINVAL;
}
if (!frame_length)
frame_length = 2 * params_physical_width(params);
} else if (dev->fmt & SND_SOC_DAIFMT_DSP_A) {
if (dev->tdm_slots) {
if (channels % 2 && channels * 2 <= dev->tdm_slots) {
/*
* Duplicate data for even-numbered channels
* to odd-numbered channels
*/
if (is_playback)
mra |= MCHP_I2SMCC_MRA_TXMONO;
else
mra |= MCHP_I2SMCC_MRA_RXMONO;
}
channels = dev->tdm_slots;
}
mra |= MCHP_I2SMCC_MRA_NBCHAN(channels);
if (!frame_length)
frame_length = channels * MCHP_I2MCC_TDM_SLOT_WIDTH;
}
/*
* We must have the same burst size configured
* in the DMA transfer and in out IP
*/
mrb |= MCHP_I2SMCC_MRB_DMACHUNK(channels);
if (is_playback)
dev->playback.maxburst = 1 << (fls(channels) - 1);
else
dev->capture.maxburst = 1 << (fls(channels) - 1);
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S8:
mra |= MCHP_I2SMCC_MRA_DATALENGTH_8_BITS;
break;
case SNDRV_PCM_FORMAT_S16_LE:
mra |= MCHP_I2SMCC_MRA_DATALENGTH_16_BITS;
break;
case SNDRV_PCM_FORMAT_S18_3LE:
mra |= MCHP_I2SMCC_MRA_DATALENGTH_18_BITS |
MCHP_I2SMCC_MRA_IWS;
break;
case SNDRV_PCM_FORMAT_S20_3LE:
mra |= MCHP_I2SMCC_MRA_DATALENGTH_20_BITS |
MCHP_I2SMCC_MRA_IWS;
break;
case SNDRV_PCM_FORMAT_S24_3LE:
mra |= MCHP_I2SMCC_MRA_DATALENGTH_24_BITS |
MCHP_I2SMCC_MRA_IWS;
break;
case SNDRV_PCM_FORMAT_S24_LE:
mra |= MCHP_I2SMCC_MRA_DATALENGTH_24_BITS;
break;
case SNDRV_PCM_FORMAT_S32_LE:
mra |= MCHP_I2SMCC_MRA_DATALENGTH_32_BITS;
break;
default:
dev_err(dev->dev, "unsupported size/endianness for audio samples\n");
return -EINVAL;
}
/*
* If we are already running, the wanted setup must be
* the same with the one that's currently ongoing
*/
if (mchp_i2s_mcc_is_running(dev)) {
u32 mra_cur;
u32 mrb_cur;
regmap_read(dev->regmap, MCHP_I2SMCC_MRA, &mra_cur);
regmap_read(dev->regmap, MCHP_I2SMCC_MRB, &mrb_cur);
if (mra != mra_cur || mrb != mrb_cur)
return -EINVAL;
return 0;
}
/* Save the number of channels to know what interrupts to enable */
dev->channels = channels;
if (set_divs) {
bclk_rate = frame_length * params_rate(params);
ret = mchp_i2s_mcc_config_divs(dev, bclk_rate, &mra);
if (ret) {
dev_err(dev->dev, "unable to configure the divisors: %d\n",
ret);
return ret;
}
}
ret = regmap_write(dev->regmap, MCHP_I2SMCC_MRA, mra);
if (ret < 0) {
if (dev->gclk_use) {
clk_unprepare(dev->gclk);
dev->gclk_use = 0;
}
return ret;
}
return regmap_write(dev->regmap, MCHP_I2SMCC_MRB, mrb);
}
static int mchp_i2s_mcc_hw_free(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
long err;
if (is_playback) {
err = wait_event_interruptible_timeout(dev->wq_txrdy,
dev->tx_rdy,
msecs_to_jiffies(500));
if (err == 0) {
dev_warn_once(dev->dev,
"Timeout waiting for Tx ready\n");
regmap_write(dev->regmap, MCHP_I2SMCC_IDRA,
MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels));
dev->tx_rdy = 1;
}
} else {
err = wait_event_interruptible_timeout(dev->wq_rxrdy,
dev->rx_rdy,
msecs_to_jiffies(500));
if (err == 0) {
dev_warn_once(dev->dev,
"Timeout waiting for Rx ready\n");
regmap_write(dev->regmap, MCHP_I2SMCC_IDRA,
MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels));
dev->rx_rdy = 1;
}
}
if (!mchp_i2s_mcc_is_running(dev)) {
regmap_write(dev->regmap, MCHP_I2SMCC_CR, MCHP_I2SMCC_CR_CKDIS);
if (dev->gclk_running) {
clk_disable(dev->gclk);
dev->gclk_running = 0;
}
if (dev->gclk_use) {
clk_unprepare(dev->gclk);
dev->gclk_use = 0;
}
}
return 0;
}
static int mchp_i2s_mcc_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
u32 cr = 0;
u32 iera = 0;
u32 sr;
int err;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (is_playback)
cr = MCHP_I2SMCC_CR_TXEN | MCHP_I2SMCC_CR_CKEN;
else
cr = MCHP_I2SMCC_CR_RXEN | MCHP_I2SMCC_CR_CKEN;
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
regmap_read(dev->regmap, MCHP_I2SMCC_SR, &sr);
if (is_playback && (sr & MCHP_I2SMCC_SR_TXEN)) {
cr = MCHP_I2SMCC_CR_TXDIS;
dev->tx_rdy = 0;
/*
* Enable Tx Ready interrupts on all channels
* to assure all data is sent
*/
iera = MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels);
} else if (!is_playback && (sr & MCHP_I2SMCC_SR_RXEN)) {
cr = MCHP_I2SMCC_CR_RXDIS;
dev->rx_rdy = 0;
/*
* Enable Rx Ready interrupts on all channels
* to assure all data is received
*/
iera = MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels);
}
break;
default:
return -EINVAL;
}
if ((cr & MCHP_I2SMCC_CR_CKEN) && dev->gclk_use &&
!dev->gclk_running) {
err = clk_enable(dev->gclk);
if (err) {
dev_err_once(dev->dev, "failed to enable GCLK: %d\n",
err);
} else {
dev->gclk_running = 1;
}
}
regmap_write(dev->regmap, MCHP_I2SMCC_IERA, iera);
regmap_write(dev->regmap, MCHP_I2SMCC_CR, cr);
return 0;
}
static int mchp_i2s_mcc_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
/* Software reset the IP if it's not running */
if (!mchp_i2s_mcc_is_running(dev)) {
return regmap_write(dev->regmap, MCHP_I2SMCC_CR,
MCHP_I2SMCC_CR_SWRST);
}
return 0;
}
static const struct snd_soc_dai_ops mchp_i2s_mcc_dai_ops = {
.set_sysclk = mchp_i2s_mcc_set_sysclk,
.set_bclk_ratio = mchp_i2s_mcc_set_bclk_ratio,
.startup = mchp_i2s_mcc_startup,
.trigger = mchp_i2s_mcc_trigger,
.hw_params = mchp_i2s_mcc_hw_params,
.hw_free = mchp_i2s_mcc_hw_free,
.set_fmt = mchp_i2s_mcc_set_dai_fmt,
.set_tdm_slot = mchp_i2s_mcc_set_dai_tdm_slot,
};
static int mchp_i2s_mcc_dai_probe(struct snd_soc_dai *dai)
{
struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
init_waitqueue_head(&dev->wq_txrdy);
init_waitqueue_head(&dev->wq_rxrdy);
dev->tx_rdy = 1;
dev->rx_rdy = 1;
snd_soc_dai_init_dma_data(dai, &dev->playback, &dev->capture);
return 0;
}
#define MCHP_I2SMCC_RATES SNDRV_PCM_RATE_8000_192000
#define MCHP_I2SMCC_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 | \
SNDRV_PCM_FMTBIT_S32_LE)
static struct snd_soc_dai_driver mchp_i2s_mcc_dai = {
.probe = mchp_i2s_mcc_dai_probe,
.playback = {
.stream_name = "I2SMCC-Playback",
.channels_min = 1,
.channels_max = 8,
.rates = MCHP_I2SMCC_RATES,
.formats = MCHP_I2SMCC_FORMATS,
},
.capture = {
.stream_name = "I2SMCC-Capture",
.channels_min = 1,
.channels_max = 8,
.rates = MCHP_I2SMCC_RATES,
.formats = MCHP_I2SMCC_FORMATS,
},
.ops = &mchp_i2s_mcc_dai_ops,
.symmetric_rates = 1,
.symmetric_samplebits = 1,
.symmetric_channels = 1,
};
static const struct snd_soc_component_driver mchp_i2s_mcc_component = {
.name = "mchp-i2s-mcc",
};
#ifdef CONFIG_OF
static const struct of_device_id mchp_i2s_mcc_dt_ids[] = {
{
.compatible = "microchip,sam9x60-i2smcc",
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mchp_i2s_mcc_dt_ids);
#endif
static int mchp_i2s_mcc_probe(struct platform_device *pdev)
{
struct mchp_i2s_mcc_dev *dev;
struct resource *mem;
struct regmap *regmap;
void __iomem *base;
u32 version;
int irq;
int err;
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(base))
return PTR_ERR(base);
regmap = devm_regmap_init_mmio(&pdev->dev, base,
&mchp_i2s_mcc_regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
err = devm_request_irq(&pdev->dev, irq, mchp_i2s_mcc_interrupt, 0,
dev_name(&pdev->dev), dev);
if (err)
return err;
dev->pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(dev->pclk)) {
err = PTR_ERR(dev->pclk);
dev_err(&pdev->dev,
"failed to get the peripheral clock: %d\n", err);
return err;
}
/* Get the optional generated clock */
dev->gclk = devm_clk_get(&pdev->dev, "gclk");
if (IS_ERR(dev->gclk)) {
if (PTR_ERR(dev->gclk) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_warn(&pdev->dev,
"generated clock not found: %d\n", err);
dev->gclk = NULL;
}
dev->dev = &pdev->dev;
dev->regmap = regmap;
platform_set_drvdata(pdev, dev);
err = clk_prepare_enable(dev->pclk);
if (err) {
dev_err(&pdev->dev,
"failed to enable the peripheral clock: %d\n", err);
return err;
}
err = devm_snd_soc_register_component(&pdev->dev,
&mchp_i2s_mcc_component,
&mchp_i2s_mcc_dai, 1);
if (err) {
dev_err(&pdev->dev, "failed to register DAI: %d\n", err);
clk_disable_unprepare(dev->pclk);
return err;
}
dev->playback.addr = (dma_addr_t)mem->start + MCHP_I2SMCC_THR;
dev->capture.addr = (dma_addr_t)mem->start + MCHP_I2SMCC_RHR;
err = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
if (err) {
dev_err(&pdev->dev, "failed to register PCM: %d\n", err);
clk_disable_unprepare(dev->pclk);
return err;
}
/* Get IP version. */
regmap_read(dev->regmap, MCHP_I2SMCC_VERSION, &version);
dev_info(&pdev->dev, "hw version: %#lx\n",
version & MCHP_I2SMCC_VERSION_MASK);
return 0;
}
static int mchp_i2s_mcc_remove(struct platform_device *pdev)
{
struct mchp_i2s_mcc_dev *dev = platform_get_drvdata(pdev);
clk_disable_unprepare(dev->pclk);
return 0;
}
static struct platform_driver mchp_i2s_mcc_driver = {
.driver = {
.name = "mchp_i2s_mcc",
.of_match_table = of_match_ptr(mchp_i2s_mcc_dt_ids),
},
.probe = mchp_i2s_mcc_probe,
.remove = mchp_i2s_mcc_remove,
};
module_platform_driver(mchp_i2s_mcc_driver);
MODULE_DESCRIPTION("Microchip I2S Multi-Channel Controller driver");
MODULE_AUTHOR("Codrin Ciubotariu <codrin.ciubotariu@microchip.com>");
MODULE_LICENSE("GPL v2");
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