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![YueHaibing](/assets/img/avatar_default.png)
Use devm_platform_ioremap_resource() to simplify the code a bit. This is detected by coccinelle. Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: YueHaibing <yuehaibing@huawei.com> Link: https://lore.kernel.org/r/20190727150738.54764-10-yuehaibing@huawei.com Signed-off-by: Mark Brown <broonie@kernel.org>
932 lines
24 KiB
C
932 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ALSA SoC I2S Audio Layer for Broadcom BCM2835 SoC
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*
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* Author: Florian Meier <florian.meier@koalo.de>
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* Copyright 2013
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*
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* Based on
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* Raspberry Pi PCM I2S ALSA Driver
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* Copyright (c) by Phil Poole 2013
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*
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* ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
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* Vladimir Barinov, <vbarinov@embeddedalley.com>
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* Copyright (C) 2007 MontaVista Software, Inc., <source@mvista.com>
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*
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* OMAP ALSA SoC DAI driver using McBSP port
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* Copyright (C) 2008 Nokia Corporation
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* Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
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* Peter Ujfalusi <peter.ujfalusi@ti.com>
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*
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* Freescale SSI ALSA SoC Digital Audio Interface (DAI) driver
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* Author: Timur Tabi <timur@freescale.com>
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* Copyright 2007-2010 Freescale Semiconductor, Inc.
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*/
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of_address.h>
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/dmaengine_pcm.h>
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#include <sound/initval.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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/* I2S registers */
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#define BCM2835_I2S_CS_A_REG 0x00
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#define BCM2835_I2S_FIFO_A_REG 0x04
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#define BCM2835_I2S_MODE_A_REG 0x08
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#define BCM2835_I2S_RXC_A_REG 0x0c
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#define BCM2835_I2S_TXC_A_REG 0x10
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#define BCM2835_I2S_DREQ_A_REG 0x14
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#define BCM2835_I2S_INTEN_A_REG 0x18
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#define BCM2835_I2S_INTSTC_A_REG 0x1c
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#define BCM2835_I2S_GRAY_REG 0x20
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/* I2S register settings */
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#define BCM2835_I2S_STBY BIT(25)
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#define BCM2835_I2S_SYNC BIT(24)
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#define BCM2835_I2S_RXSEX BIT(23)
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#define BCM2835_I2S_RXF BIT(22)
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#define BCM2835_I2S_TXE BIT(21)
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#define BCM2835_I2S_RXD BIT(20)
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#define BCM2835_I2S_TXD BIT(19)
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#define BCM2835_I2S_RXR BIT(18)
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#define BCM2835_I2S_TXW BIT(17)
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#define BCM2835_I2S_CS_RXERR BIT(16)
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#define BCM2835_I2S_CS_TXERR BIT(15)
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#define BCM2835_I2S_RXSYNC BIT(14)
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#define BCM2835_I2S_TXSYNC BIT(13)
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#define BCM2835_I2S_DMAEN BIT(9)
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#define BCM2835_I2S_RXTHR(v) ((v) << 7)
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#define BCM2835_I2S_TXTHR(v) ((v) << 5)
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#define BCM2835_I2S_RXCLR BIT(4)
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#define BCM2835_I2S_TXCLR BIT(3)
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#define BCM2835_I2S_TXON BIT(2)
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#define BCM2835_I2S_RXON BIT(1)
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#define BCM2835_I2S_EN (1)
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#define BCM2835_I2S_CLKDIS BIT(28)
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#define BCM2835_I2S_PDMN BIT(27)
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#define BCM2835_I2S_PDME BIT(26)
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#define BCM2835_I2S_FRXP BIT(25)
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#define BCM2835_I2S_FTXP BIT(24)
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#define BCM2835_I2S_CLKM BIT(23)
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#define BCM2835_I2S_CLKI BIT(22)
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#define BCM2835_I2S_FSM BIT(21)
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#define BCM2835_I2S_FSI BIT(20)
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#define BCM2835_I2S_FLEN(v) ((v) << 10)
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#define BCM2835_I2S_FSLEN(v) (v)
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#define BCM2835_I2S_CHWEX BIT(15)
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#define BCM2835_I2S_CHEN BIT(14)
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#define BCM2835_I2S_CHPOS(v) ((v) << 4)
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#define BCM2835_I2S_CHWID(v) (v)
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#define BCM2835_I2S_CH1(v) ((v) << 16)
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#define BCM2835_I2S_CH2(v) (v)
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#define BCM2835_I2S_CH1_POS(v) BCM2835_I2S_CH1(BCM2835_I2S_CHPOS(v))
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#define BCM2835_I2S_CH2_POS(v) BCM2835_I2S_CH2(BCM2835_I2S_CHPOS(v))
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#define BCM2835_I2S_TX_PANIC(v) ((v) << 24)
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#define BCM2835_I2S_RX_PANIC(v) ((v) << 16)
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#define BCM2835_I2S_TX(v) ((v) << 8)
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#define BCM2835_I2S_RX(v) (v)
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#define BCM2835_I2S_INT_RXERR BIT(3)
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#define BCM2835_I2S_INT_TXERR BIT(2)
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#define BCM2835_I2S_INT_RXR BIT(1)
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#define BCM2835_I2S_INT_TXW BIT(0)
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/* Frame length register is 10 bit, maximum length 1024 */
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#define BCM2835_I2S_MAX_FRAME_LENGTH 1024
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/* General device struct */
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struct bcm2835_i2s_dev {
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struct device *dev;
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struct snd_dmaengine_dai_dma_data dma_data[2];
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unsigned int fmt;
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unsigned int tdm_slots;
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unsigned int rx_mask;
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unsigned int tx_mask;
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unsigned int slot_width;
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unsigned int frame_length;
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struct regmap *i2s_regmap;
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struct clk *clk;
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bool clk_prepared;
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int clk_rate;
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};
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static void bcm2835_i2s_start_clock(struct bcm2835_i2s_dev *dev)
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{
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unsigned int master = dev->fmt & SND_SOC_DAIFMT_MASTER_MASK;
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if (dev->clk_prepared)
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return;
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switch (master) {
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case SND_SOC_DAIFMT_CBS_CFS:
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case SND_SOC_DAIFMT_CBS_CFM:
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clk_prepare_enable(dev->clk);
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dev->clk_prepared = true;
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break;
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default:
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break;
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}
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}
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static void bcm2835_i2s_stop_clock(struct bcm2835_i2s_dev *dev)
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{
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if (dev->clk_prepared)
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clk_disable_unprepare(dev->clk);
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dev->clk_prepared = false;
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}
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static void bcm2835_i2s_clear_fifos(struct bcm2835_i2s_dev *dev,
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bool tx, bool rx)
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{
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int timeout = 1000;
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uint32_t syncval;
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uint32_t csreg;
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uint32_t i2s_active_state;
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bool clk_was_prepared;
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uint32_t off;
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uint32_t clr;
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off = tx ? BCM2835_I2S_TXON : 0;
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off |= rx ? BCM2835_I2S_RXON : 0;
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clr = tx ? BCM2835_I2S_TXCLR : 0;
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clr |= rx ? BCM2835_I2S_RXCLR : 0;
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/* Backup the current state */
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regmap_read(dev->i2s_regmap, BCM2835_I2S_CS_A_REG, &csreg);
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i2s_active_state = csreg & (BCM2835_I2S_RXON | BCM2835_I2S_TXON);
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/* Start clock if not running */
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clk_was_prepared = dev->clk_prepared;
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if (!clk_was_prepared)
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bcm2835_i2s_start_clock(dev);
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/* Stop I2S module */
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regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_CS_A_REG, off, 0);
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/*
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* Clear the FIFOs
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* Requires at least 2 PCM clock cycles to take effect
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*/
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regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_CS_A_REG, clr, clr);
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/* Wait for 2 PCM clock cycles */
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/*
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* Toggle the SYNC flag. After 2 PCM clock cycles it can be read back
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* FIXME: This does not seem to work for slave mode!
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*/
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regmap_read(dev->i2s_regmap, BCM2835_I2S_CS_A_REG, &syncval);
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syncval &= BCM2835_I2S_SYNC;
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regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_CS_A_REG,
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BCM2835_I2S_SYNC, ~syncval);
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/* Wait for the SYNC flag changing it's state */
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while (--timeout) {
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regmap_read(dev->i2s_regmap, BCM2835_I2S_CS_A_REG, &csreg);
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if ((csreg & BCM2835_I2S_SYNC) != syncval)
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break;
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}
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if (!timeout)
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dev_err(dev->dev, "I2S SYNC error!\n");
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/* Stop clock if it was not running before */
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if (!clk_was_prepared)
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bcm2835_i2s_stop_clock(dev);
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/* Restore I2S state */
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regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_CS_A_REG,
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BCM2835_I2S_RXON | BCM2835_I2S_TXON, i2s_active_state);
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}
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static int bcm2835_i2s_set_dai_fmt(struct snd_soc_dai *dai,
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unsigned int fmt)
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{
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struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
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dev->fmt = fmt;
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return 0;
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}
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static int bcm2835_i2s_set_dai_bclk_ratio(struct snd_soc_dai *dai,
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unsigned int ratio)
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{
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struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
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if (!ratio) {
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dev->tdm_slots = 0;
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return 0;
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}
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if (ratio > BCM2835_I2S_MAX_FRAME_LENGTH)
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return -EINVAL;
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dev->tdm_slots = 2;
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dev->rx_mask = 0x03;
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dev->tx_mask = 0x03;
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dev->slot_width = ratio / 2;
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dev->frame_length = ratio;
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return 0;
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}
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static int bcm2835_i2s_set_dai_tdm_slot(struct snd_soc_dai *dai,
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unsigned int tx_mask, unsigned int rx_mask,
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int slots, int width)
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{
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struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
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if (slots) {
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if (slots < 0 || width < 0)
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return -EINVAL;
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/* Limit masks to available slots */
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rx_mask &= GENMASK(slots - 1, 0);
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tx_mask &= GENMASK(slots - 1, 0);
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/*
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* The driver is limited to 2-channel setups.
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* Check that exactly 2 bits are set in the masks.
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*/
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if (hweight_long((unsigned long) rx_mask) != 2
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|| hweight_long((unsigned long) tx_mask) != 2)
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return -EINVAL;
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if (slots * width > BCM2835_I2S_MAX_FRAME_LENGTH)
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return -EINVAL;
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}
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dev->tdm_slots = slots;
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dev->rx_mask = rx_mask;
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dev->tx_mask = tx_mask;
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dev->slot_width = width;
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dev->frame_length = slots * width;
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return 0;
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}
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/*
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* Convert logical slot number into physical slot number.
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*
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* If odd_offset is 0 sequential number is identical to logical number.
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* This is used for DSP modes with slot numbering 0 1 2 3 ...
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*
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* Otherwise odd_offset defines the physical offset for odd numbered
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* slots. This is used for I2S and left/right justified modes to
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* translate from logical slot numbers 0 1 2 3 ... into physical slot
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* numbers 0 2 ... 3 4 ...
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*/
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static int bcm2835_i2s_convert_slot(unsigned int slot, unsigned int odd_offset)
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{
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if (!odd_offset)
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return slot;
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if (slot & 1)
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return (slot >> 1) + odd_offset;
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return slot >> 1;
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}
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/*
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* Calculate channel position from mask and slot width.
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*
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* Mask must contain exactly 2 set bits.
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* Lowest set bit is channel 1 position, highest set bit channel 2.
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* The constant offset is added to both channel positions.
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*
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* If odd_offset is > 0 slot positions are translated to
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* I2S-style TDM slot numbering ( 0 2 ... 3 4 ...) with odd
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* logical slot numbers starting at physical slot odd_offset.
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*/
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static void bcm2835_i2s_calc_channel_pos(
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unsigned int *ch1_pos, unsigned int *ch2_pos,
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unsigned int mask, unsigned int width,
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unsigned int bit_offset, unsigned int odd_offset)
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{
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*ch1_pos = bcm2835_i2s_convert_slot((ffs(mask) - 1), odd_offset)
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* width + bit_offset;
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*ch2_pos = bcm2835_i2s_convert_slot((fls(mask) - 1), odd_offset)
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* width + bit_offset;
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}
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static int bcm2835_i2s_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params,
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struct snd_soc_dai *dai)
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{
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struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
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unsigned int data_length, data_delay, framesync_length;
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unsigned int slots, slot_width, odd_slot_offset;
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int frame_length, bclk_rate;
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unsigned int rx_mask, tx_mask;
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unsigned int rx_ch1_pos, rx_ch2_pos, tx_ch1_pos, tx_ch2_pos;
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unsigned int mode, format;
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bool bit_clock_master = false;
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bool frame_sync_master = false;
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bool frame_start_falling_edge = false;
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uint32_t csreg;
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int ret = 0;
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/*
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* If a stream is already enabled,
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* the registers are already set properly.
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*/
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regmap_read(dev->i2s_regmap, BCM2835_I2S_CS_A_REG, &csreg);
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if (csreg & (BCM2835_I2S_TXON | BCM2835_I2S_RXON))
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return 0;
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data_length = params_width(params);
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data_delay = 0;
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odd_slot_offset = 0;
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mode = 0;
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if (dev->tdm_slots) {
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slots = dev->tdm_slots;
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slot_width = dev->slot_width;
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frame_length = dev->frame_length;
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rx_mask = dev->rx_mask;
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tx_mask = dev->tx_mask;
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bclk_rate = dev->frame_length * params_rate(params);
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} else {
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slots = 2;
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slot_width = params_width(params);
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rx_mask = 0x03;
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tx_mask = 0x03;
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frame_length = snd_soc_params_to_frame_size(params);
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if (frame_length < 0)
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return frame_length;
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bclk_rate = snd_soc_params_to_bclk(params);
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if (bclk_rate < 0)
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return bclk_rate;
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}
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/* Check if data fits into slots */
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if (data_length > slot_width)
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return -EINVAL;
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/* Check if CPU is bit clock master */
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switch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBS_CFS:
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case SND_SOC_DAIFMT_CBS_CFM:
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bit_clock_master = true;
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break;
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case SND_SOC_DAIFMT_CBM_CFS:
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case SND_SOC_DAIFMT_CBM_CFM:
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bit_clock_master = false;
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break;
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default:
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return -EINVAL;
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}
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/* Check if CPU is frame sync master */
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switch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) {
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case SND_SOC_DAIFMT_CBS_CFS:
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case SND_SOC_DAIFMT_CBM_CFS:
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frame_sync_master = true;
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break;
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case SND_SOC_DAIFMT_CBS_CFM:
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case SND_SOC_DAIFMT_CBM_CFM:
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frame_sync_master = false;
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break;
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default:
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return -EINVAL;
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}
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/* Clock should only be set up here if CPU is clock master */
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if (bit_clock_master &&
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(!dev->clk_prepared || dev->clk_rate != bclk_rate)) {
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if (dev->clk_prepared)
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bcm2835_i2s_stop_clock(dev);
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if (dev->clk_rate != bclk_rate) {
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ret = clk_set_rate(dev->clk, bclk_rate);
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if (ret)
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return ret;
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dev->clk_rate = bclk_rate;
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}
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bcm2835_i2s_start_clock(dev);
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}
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/* Setup the frame format */
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format = BCM2835_I2S_CHEN;
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if (data_length >= 24)
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format |= BCM2835_I2S_CHWEX;
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format |= BCM2835_I2S_CHWID((data_length-8)&0xf);
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/* CH2 format is the same as for CH1 */
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format = BCM2835_I2S_CH1(format) | BCM2835_I2S_CH2(format);
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switch (dev->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
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case SND_SOC_DAIFMT_I2S:
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/* I2S mode needs an even number of slots */
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if (slots & 1)
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return -EINVAL;
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/*
|
|
* Use I2S-style logical slot numbering: even slots
|
|
* are in first half of frame, odd slots in second half.
|
|
*/
|
|
odd_slot_offset = slots >> 1;
|
|
|
|
/* MSB starts one cycle after frame start */
|
|
data_delay = 1;
|
|
|
|
/* Setup frame sync signal for 50% duty cycle */
|
|
framesync_length = frame_length / 2;
|
|
frame_start_falling_edge = true;
|
|
break;
|
|
case SND_SOC_DAIFMT_LEFT_J:
|
|
if (slots & 1)
|
|
return -EINVAL;
|
|
|
|
odd_slot_offset = slots >> 1;
|
|
data_delay = 0;
|
|
framesync_length = frame_length / 2;
|
|
frame_start_falling_edge = false;
|
|
break;
|
|
case SND_SOC_DAIFMT_RIGHT_J:
|
|
if (slots & 1)
|
|
return -EINVAL;
|
|
|
|
/* Odd frame lengths aren't supported */
|
|
if (frame_length & 1)
|
|
return -EINVAL;
|
|
|
|
odd_slot_offset = slots >> 1;
|
|
data_delay = slot_width - data_length;
|
|
framesync_length = frame_length / 2;
|
|
frame_start_falling_edge = false;
|
|
break;
|
|
case SND_SOC_DAIFMT_DSP_A:
|
|
data_delay = 1;
|
|
framesync_length = 1;
|
|
frame_start_falling_edge = false;
|
|
break;
|
|
case SND_SOC_DAIFMT_DSP_B:
|
|
data_delay = 0;
|
|
framesync_length = 1;
|
|
frame_start_falling_edge = false;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
bcm2835_i2s_calc_channel_pos(&rx_ch1_pos, &rx_ch2_pos,
|
|
rx_mask, slot_width, data_delay, odd_slot_offset);
|
|
bcm2835_i2s_calc_channel_pos(&tx_ch1_pos, &tx_ch2_pos,
|
|
tx_mask, slot_width, data_delay, odd_slot_offset);
|
|
|
|
/*
|
|
* Transmitting data immediately after frame start, eg
|
|
* in left-justified or DSP mode A, only works stable
|
|
* if bcm2835 is the frame clock master.
|
|
*/
|
|
if ((!rx_ch1_pos || !tx_ch1_pos) && !frame_sync_master)
|
|
dev_warn(dev->dev,
|
|
"Unstable slave config detected, L/R may be swapped");
|
|
|
|
/*
|
|
* Set format for both streams.
|
|
* We cannot set another frame length
|
|
* (and therefore word length) anyway,
|
|
* so the format will be the same.
|
|
*/
|
|
regmap_write(dev->i2s_regmap, BCM2835_I2S_RXC_A_REG,
|
|
format
|
|
| BCM2835_I2S_CH1_POS(rx_ch1_pos)
|
|
| BCM2835_I2S_CH2_POS(rx_ch2_pos));
|
|
regmap_write(dev->i2s_regmap, BCM2835_I2S_TXC_A_REG,
|
|
format
|
|
| BCM2835_I2S_CH1_POS(tx_ch1_pos)
|
|
| BCM2835_I2S_CH2_POS(tx_ch2_pos));
|
|
|
|
/* Setup the I2S mode */
|
|
|
|
if (data_length <= 16) {
|
|
/*
|
|
* Use frame packed mode (2 channels per 32 bit word)
|
|
* We cannot set another frame length in the second stream
|
|
* (and therefore word length) anyway,
|
|
* so the format will be the same.
|
|
*/
|
|
mode |= BCM2835_I2S_FTXP | BCM2835_I2S_FRXP;
|
|
}
|
|
|
|
mode |= BCM2835_I2S_FLEN(frame_length - 1);
|
|
mode |= BCM2835_I2S_FSLEN(framesync_length);
|
|
|
|
/* CLKM selects bcm2835 clock slave mode */
|
|
if (!bit_clock_master)
|
|
mode |= BCM2835_I2S_CLKM;
|
|
|
|
/* FSM selects bcm2835 frame sync slave mode */
|
|
if (!frame_sync_master)
|
|
mode |= BCM2835_I2S_FSM;
|
|
|
|
/* CLKI selects normal clocking mode, sampling on rising edge */
|
|
switch (dev->fmt & SND_SOC_DAIFMT_INV_MASK) {
|
|
case SND_SOC_DAIFMT_NB_NF:
|
|
case SND_SOC_DAIFMT_NB_IF:
|
|
mode |= BCM2835_I2S_CLKI;
|
|
break;
|
|
case SND_SOC_DAIFMT_IB_NF:
|
|
case SND_SOC_DAIFMT_IB_IF:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* FSI selects frame start on falling edge */
|
|
switch (dev->fmt & SND_SOC_DAIFMT_INV_MASK) {
|
|
case SND_SOC_DAIFMT_NB_NF:
|
|
case SND_SOC_DAIFMT_IB_NF:
|
|
if (frame_start_falling_edge)
|
|
mode |= BCM2835_I2S_FSI;
|
|
break;
|
|
case SND_SOC_DAIFMT_NB_IF:
|
|
case SND_SOC_DAIFMT_IB_IF:
|
|
if (!frame_start_falling_edge)
|
|
mode |= BCM2835_I2S_FSI;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
regmap_write(dev->i2s_regmap, BCM2835_I2S_MODE_A_REG, mode);
|
|
|
|
/* Setup the DMA parameters */
|
|
regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_CS_A_REG,
|
|
BCM2835_I2S_RXTHR(1)
|
|
| BCM2835_I2S_TXTHR(1)
|
|
| BCM2835_I2S_DMAEN, 0xffffffff);
|
|
|
|
regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_DREQ_A_REG,
|
|
BCM2835_I2S_TX_PANIC(0x10)
|
|
| BCM2835_I2S_RX_PANIC(0x30)
|
|
| BCM2835_I2S_TX(0x30)
|
|
| BCM2835_I2S_RX(0x20), 0xffffffff);
|
|
|
|
/* Clear FIFOs */
|
|
bcm2835_i2s_clear_fifos(dev, true, true);
|
|
|
|
dev_dbg(dev->dev,
|
|
"slots: %d width: %d rx mask: 0x%02x tx_mask: 0x%02x\n",
|
|
slots, slot_width, rx_mask, tx_mask);
|
|
|
|
dev_dbg(dev->dev, "frame len: %d sync len: %d data len: %d\n",
|
|
frame_length, framesync_length, data_length);
|
|
|
|
dev_dbg(dev->dev, "rx pos: %d,%d tx pos: %d,%d\n",
|
|
rx_ch1_pos, rx_ch2_pos, tx_ch1_pos, tx_ch2_pos);
|
|
|
|
dev_dbg(dev->dev, "sampling rate: %d bclk rate: %d\n",
|
|
params_rate(params), bclk_rate);
|
|
|
|
dev_dbg(dev->dev, "CLKM: %d CLKI: %d FSM: %d FSI: %d frame start: %s edge\n",
|
|
!!(mode & BCM2835_I2S_CLKM),
|
|
!!(mode & BCM2835_I2S_CLKI),
|
|
!!(mode & BCM2835_I2S_FSM),
|
|
!!(mode & BCM2835_I2S_FSI),
|
|
(mode & BCM2835_I2S_FSI) ? "falling" : "rising");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bcm2835_i2s_prepare(struct snd_pcm_substream *substream,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
|
|
uint32_t cs_reg;
|
|
|
|
/*
|
|
* Clear both FIFOs if the one that should be started
|
|
* is not empty at the moment. This should only happen
|
|
* after overrun. Otherwise, hw_params would have cleared
|
|
* the FIFO.
|
|
*/
|
|
regmap_read(dev->i2s_regmap, BCM2835_I2S_CS_A_REG, &cs_reg);
|
|
|
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK
|
|
&& !(cs_reg & BCM2835_I2S_TXE))
|
|
bcm2835_i2s_clear_fifos(dev, true, false);
|
|
else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE
|
|
&& (cs_reg & BCM2835_I2S_RXD))
|
|
bcm2835_i2s_clear_fifos(dev, false, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bcm2835_i2s_stop(struct bcm2835_i2s_dev *dev,
|
|
struct snd_pcm_substream *substream,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
uint32_t mask;
|
|
|
|
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
|
|
mask = BCM2835_I2S_RXON;
|
|
else
|
|
mask = BCM2835_I2S_TXON;
|
|
|
|
regmap_update_bits(dev->i2s_regmap,
|
|
BCM2835_I2S_CS_A_REG, mask, 0);
|
|
|
|
/* Stop also the clock when not SND_SOC_DAIFMT_CONT */
|
|
if (!dai->active && !(dev->fmt & SND_SOC_DAIFMT_CONT))
|
|
bcm2835_i2s_stop_clock(dev);
|
|
}
|
|
|
|
static int bcm2835_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
|
|
uint32_t mask;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
case SNDRV_PCM_TRIGGER_RESUME:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
bcm2835_i2s_start_clock(dev);
|
|
|
|
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
|
|
mask = BCM2835_I2S_RXON;
|
|
else
|
|
mask = BCM2835_I2S_TXON;
|
|
|
|
regmap_update_bits(dev->i2s_regmap,
|
|
BCM2835_I2S_CS_A_REG, mask, mask);
|
|
break;
|
|
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
case SNDRV_PCM_TRIGGER_SUSPEND:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
bcm2835_i2s_stop(dev, substream, dai);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm2835_i2s_startup(struct snd_pcm_substream *substream,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
|
|
|
|
if (dai->active)
|
|
return 0;
|
|
|
|
/* Should this still be running stop it */
|
|
bcm2835_i2s_stop_clock(dev);
|
|
|
|
/* Enable PCM block */
|
|
regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_CS_A_REG,
|
|
BCM2835_I2S_EN, BCM2835_I2S_EN);
|
|
|
|
/*
|
|
* Disable STBY.
|
|
* Requires at least 4 PCM clock cycles to take effect.
|
|
*/
|
|
regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_CS_A_REG,
|
|
BCM2835_I2S_STBY, BCM2835_I2S_STBY);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bcm2835_i2s_shutdown(struct snd_pcm_substream *substream,
|
|
struct snd_soc_dai *dai)
|
|
{
|
|
struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
|
|
|
|
bcm2835_i2s_stop(dev, substream, dai);
|
|
|
|
/* If both streams are stopped, disable module and clock */
|
|
if (dai->active)
|
|
return;
|
|
|
|
/* Disable the module */
|
|
regmap_update_bits(dev->i2s_regmap, BCM2835_I2S_CS_A_REG,
|
|
BCM2835_I2S_EN, 0);
|
|
|
|
/*
|
|
* Stopping clock is necessary, because stop does
|
|
* not stop the clock when SND_SOC_DAIFMT_CONT
|
|
*/
|
|
bcm2835_i2s_stop_clock(dev);
|
|
}
|
|
|
|
static const struct snd_soc_dai_ops bcm2835_i2s_dai_ops = {
|
|
.startup = bcm2835_i2s_startup,
|
|
.shutdown = bcm2835_i2s_shutdown,
|
|
.prepare = bcm2835_i2s_prepare,
|
|
.trigger = bcm2835_i2s_trigger,
|
|
.hw_params = bcm2835_i2s_hw_params,
|
|
.set_fmt = bcm2835_i2s_set_dai_fmt,
|
|
.set_bclk_ratio = bcm2835_i2s_set_dai_bclk_ratio,
|
|
.set_tdm_slot = bcm2835_i2s_set_dai_tdm_slot,
|
|
};
|
|
|
|
static int bcm2835_i2s_dai_probe(struct snd_soc_dai *dai)
|
|
{
|
|
struct bcm2835_i2s_dev *dev = snd_soc_dai_get_drvdata(dai);
|
|
|
|
snd_soc_dai_init_dma_data(dai,
|
|
&dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK],
|
|
&dev->dma_data[SNDRV_PCM_STREAM_CAPTURE]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct snd_soc_dai_driver bcm2835_i2s_dai = {
|
|
.name = "bcm2835-i2s",
|
|
.probe = bcm2835_i2s_dai_probe,
|
|
.playback = {
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.rates = SNDRV_PCM_RATE_CONTINUOUS,
|
|
.rate_min = 8000,
|
|
.rate_max = 384000,
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE
|
|
| SNDRV_PCM_FMTBIT_S24_LE
|
|
| SNDRV_PCM_FMTBIT_S32_LE
|
|
},
|
|
.capture = {
|
|
.channels_min = 2,
|
|
.channels_max = 2,
|
|
.rates = SNDRV_PCM_RATE_CONTINUOUS,
|
|
.rate_min = 8000,
|
|
.rate_max = 384000,
|
|
.formats = SNDRV_PCM_FMTBIT_S16_LE
|
|
| SNDRV_PCM_FMTBIT_S24_LE
|
|
| SNDRV_PCM_FMTBIT_S32_LE
|
|
},
|
|
.ops = &bcm2835_i2s_dai_ops,
|
|
.symmetric_rates = 1,
|
|
.symmetric_samplebits = 1,
|
|
};
|
|
|
|
static bool bcm2835_i2s_volatile_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
switch (reg) {
|
|
case BCM2835_I2S_CS_A_REG:
|
|
case BCM2835_I2S_FIFO_A_REG:
|
|
case BCM2835_I2S_INTSTC_A_REG:
|
|
case BCM2835_I2S_GRAY_REG:
|
|
return true;
|
|
default:
|
|
return false;
|
|
};
|
|
}
|
|
|
|
static bool bcm2835_i2s_precious_reg(struct device *dev, unsigned int reg)
|
|
{
|
|
switch (reg) {
|
|
case BCM2835_I2S_FIFO_A_REG:
|
|
return true;
|
|
default:
|
|
return false;
|
|
};
|
|
}
|
|
|
|
static const struct regmap_config bcm2835_regmap_config = {
|
|
.reg_bits = 32,
|
|
.reg_stride = 4,
|
|
.val_bits = 32,
|
|
.max_register = BCM2835_I2S_GRAY_REG,
|
|
.precious_reg = bcm2835_i2s_precious_reg,
|
|
.volatile_reg = bcm2835_i2s_volatile_reg,
|
|
.cache_type = REGCACHE_RBTREE,
|
|
};
|
|
|
|
static const struct snd_soc_component_driver bcm2835_i2s_component = {
|
|
.name = "bcm2835-i2s-comp",
|
|
};
|
|
|
|
static int bcm2835_i2s_probe(struct platform_device *pdev)
|
|
{
|
|
struct bcm2835_i2s_dev *dev;
|
|
int ret;
|
|
void __iomem *base;
|
|
const __be32 *addr;
|
|
dma_addr_t dma_base;
|
|
|
|
dev = devm_kzalloc(&pdev->dev, sizeof(*dev),
|
|
GFP_KERNEL);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
|
|
/* get the clock */
|
|
dev->clk_prepared = false;
|
|
dev->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(dev->clk)) {
|
|
dev_err(&pdev->dev, "could not get clk: %ld\n",
|
|
PTR_ERR(dev->clk));
|
|
return PTR_ERR(dev->clk);
|
|
}
|
|
|
|
/* Request ioarea */
|
|
base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
dev->i2s_regmap = devm_regmap_init_mmio(&pdev->dev, base,
|
|
&bcm2835_regmap_config);
|
|
if (IS_ERR(dev->i2s_regmap))
|
|
return PTR_ERR(dev->i2s_regmap);
|
|
|
|
/* Set the DMA address - we have to parse DT ourselves */
|
|
addr = of_get_address(pdev->dev.of_node, 0, NULL, NULL);
|
|
if (!addr) {
|
|
dev_err(&pdev->dev, "could not get DMA-register address\n");
|
|
return -EINVAL;
|
|
}
|
|
dma_base = be32_to_cpup(addr);
|
|
|
|
dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
|
|
dma_base + BCM2835_I2S_FIFO_A_REG;
|
|
|
|
dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
|
|
dma_base + BCM2835_I2S_FIFO_A_REG;
|
|
|
|
/* Set the bus width */
|
|
dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr_width =
|
|
DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr_width =
|
|
DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
|
|
/* Set burst */
|
|
dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].maxburst = 2;
|
|
dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].maxburst = 2;
|
|
|
|
/*
|
|
* Set the PACK flag to enable S16_LE support (2 S16_LE values
|
|
* packed into 32-bit transfers).
|
|
*/
|
|
dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].flags =
|
|
SND_DMAENGINE_PCM_DAI_FLAG_PACK;
|
|
dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].flags =
|
|
SND_DMAENGINE_PCM_DAI_FLAG_PACK;
|
|
|
|
/* Store the pdev */
|
|
dev->dev = &pdev->dev;
|
|
dev_set_drvdata(&pdev->dev, dev);
|
|
|
|
ret = devm_snd_soc_register_component(&pdev->dev,
|
|
&bcm2835_i2s_component, &bcm2835_i2s_dai, 1);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Could not register DAI: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Could not register PCM: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id bcm2835_i2s_of_match[] = {
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{ .compatible = "brcm,bcm2835-i2s", },
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{},
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};
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|
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MODULE_DEVICE_TABLE(of, bcm2835_i2s_of_match);
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|
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static struct platform_driver bcm2835_i2s_driver = {
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.probe = bcm2835_i2s_probe,
|
|
.driver = {
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.name = "bcm2835-i2s",
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|
.of_match_table = bcm2835_i2s_of_match,
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|
},
|
|
};
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|
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module_platform_driver(bcm2835_i2s_driver);
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|
|
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MODULE_ALIAS("platform:bcm2835-i2s");
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|
MODULE_DESCRIPTION("BCM2835 I2S interface");
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|
MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
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|
MODULE_LICENSE("GPL v2");
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