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WSL2-Linux-Kernel/sound/soc/davinci/davinci-mcasp.c

2065 строки
54 KiB
C
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/*
* ALSA SoC McASP Audio Layer for TI DAVINCI processor
*
* Multi-channel Audio Serial Port Driver
*
* Author: Nirmal Pandey <n-pandey@ti.com>,
* Suresh Rajashekara <suresh.r@ti.com>
* Steve Chen <schen@.mvista.com>
*
* Copyright: (C) 2009 MontaVista Software, Inc., <source@mvista.com>
* Copyright: (C) 2009 Texas Instruments, India
*
* 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.
*/
#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/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_device.h>
#include <linux/platform_data/davinci_asp.h>
#include <linux/math64.h>
#include <sound/asoundef.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/dmaengine_pcm.h>
#include <sound/omap-pcm.h>
#include "edma-pcm.h"
#include "davinci-mcasp.h"
#define MCASP_MAX_AFIFO_DEPTH 64
static u32 context_regs[] = {
DAVINCI_MCASP_TXFMCTL_REG,
DAVINCI_MCASP_RXFMCTL_REG,
DAVINCI_MCASP_TXFMT_REG,
DAVINCI_MCASP_RXFMT_REG,
DAVINCI_MCASP_ACLKXCTL_REG,
DAVINCI_MCASP_ACLKRCTL_REG,
DAVINCI_MCASP_AHCLKXCTL_REG,
DAVINCI_MCASP_AHCLKRCTL_REG,
DAVINCI_MCASP_PDIR_REG,
DAVINCI_MCASP_RXMASK_REG,
DAVINCI_MCASP_TXMASK_REG,
DAVINCI_MCASP_RXTDM_REG,
DAVINCI_MCASP_TXTDM_REG,
};
struct davinci_mcasp_context {
u32 config_regs[ARRAY_SIZE(context_regs)];
u32 afifo_regs[2]; /* for read/write fifo control registers */
u32 *xrsr_regs; /* for serializer configuration */
bool pm_state;
};
struct davinci_mcasp_ruledata {
struct davinci_mcasp *mcasp;
int serializers;
};
struct davinci_mcasp {
struct snd_dmaengine_dai_dma_data dma_data[2];
void __iomem *base;
u32 fifo_base;
struct device *dev;
struct snd_pcm_substream *substreams[2];
unsigned int dai_fmt;
/* McASP specific data */
int tdm_slots;
u32 tdm_mask[2];
int slot_width;
u8 op_mode;
u8 num_serializer;
u8 *serial_dir;
u8 version;
u8 bclk_div;
int streams;
u32 irq_request[2];
int dma_request[2];
int sysclk_freq;
bool bclk_master;
/* McASP FIFO related */
u8 txnumevt;
u8 rxnumevt;
bool dat_port;
/* Used for comstraint setting on the second stream */
u32 channels;
#ifdef CONFIG_PM_SLEEP
struct davinci_mcasp_context context;
#endif
struct davinci_mcasp_ruledata ruledata[2];
struct snd_pcm_hw_constraint_list chconstr[2];
};
static inline void mcasp_set_bits(struct davinci_mcasp *mcasp, u32 offset,
u32 val)
{
void __iomem *reg = mcasp->base + offset;
__raw_writel(__raw_readl(reg) | val, reg);
}
static inline void mcasp_clr_bits(struct davinci_mcasp *mcasp, u32 offset,
u32 val)
{
void __iomem *reg = mcasp->base + offset;
__raw_writel((__raw_readl(reg) & ~(val)), reg);
}
static inline void mcasp_mod_bits(struct davinci_mcasp *mcasp, u32 offset,
u32 val, u32 mask)
{
void __iomem *reg = mcasp->base + offset;
__raw_writel((__raw_readl(reg) & ~mask) | val, reg);
}
static inline void mcasp_set_reg(struct davinci_mcasp *mcasp, u32 offset,
u32 val)
{
__raw_writel(val, mcasp->base + offset);
}
static inline u32 mcasp_get_reg(struct davinci_mcasp *mcasp, u32 offset)
{
return (u32)__raw_readl(mcasp->base + offset);
}
static void mcasp_set_ctl_reg(struct davinci_mcasp *mcasp, u32 ctl_reg, u32 val)
{
int i = 0;
mcasp_set_bits(mcasp, ctl_reg, val);
/* programming GBLCTL needs to read back from GBLCTL and verfiy */
/* loop count is to avoid the lock-up */
for (i = 0; i < 1000; i++) {
if ((mcasp_get_reg(mcasp, ctl_reg) & val) == val)
break;
}
if (i == 1000 && ((mcasp_get_reg(mcasp, ctl_reg) & val) != val))
printk(KERN_ERR "GBLCTL write error\n");
}
static bool mcasp_is_synchronous(struct davinci_mcasp *mcasp)
{
u32 rxfmctl = mcasp_get_reg(mcasp, DAVINCI_MCASP_RXFMCTL_REG);
u32 aclkxctl = mcasp_get_reg(mcasp, DAVINCI_MCASP_ACLKXCTL_REG);
return !(aclkxctl & TX_ASYNC) && rxfmctl & AFSRE;
}
static void mcasp_start_rx(struct davinci_mcasp *mcasp)
{
if (mcasp->rxnumevt) { /* enable FIFO */
u32 reg = mcasp->fifo_base + MCASP_RFIFOCTL_OFFSET;
mcasp_clr_bits(mcasp, reg, FIFO_ENABLE);
mcasp_set_bits(mcasp, reg, FIFO_ENABLE);
}
/* Start clocks */
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLR_REG, RXHCLKRST);
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLR_REG, RXCLKRST);
/*
* When ASYNC == 0 the transmit and receive sections operate
* synchronously from the transmit clock and frame sync. We need to make
* sure that the TX signlas are enabled when starting reception.
*/
if (mcasp_is_synchronous(mcasp)) {
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXHCLKRST);
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXCLKRST);
}
/* Activate serializer(s) */
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLR_REG, RXSERCLR);
/* Release RX state machine */
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLR_REG, RXSMRST);
/* Release Frame Sync generator */
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLR_REG, RXFSRST);
if (mcasp_is_synchronous(mcasp))
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXFSRST);
/* enable receive IRQs */
mcasp_set_bits(mcasp, DAVINCI_MCASP_EVTCTLR_REG,
mcasp->irq_request[SNDRV_PCM_STREAM_CAPTURE]);
}
static void mcasp_start_tx(struct davinci_mcasp *mcasp)
{
u32 cnt;
if (mcasp->txnumevt) { /* enable FIFO */
u32 reg = mcasp->fifo_base + MCASP_WFIFOCTL_OFFSET;
mcasp_clr_bits(mcasp, reg, FIFO_ENABLE);
mcasp_set_bits(mcasp, reg, FIFO_ENABLE);
}
/* Start clocks */
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXHCLKRST);
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXCLKRST);
/* Activate serializer(s) */
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXSERCLR);
/* wait for XDATA to be cleared */
cnt = 0;
while ((mcasp_get_reg(mcasp, DAVINCI_MCASP_TXSTAT_REG) & XRDATA) &&
(cnt < 100000))
cnt++;
/* Release TX state machine */
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXSMRST);
/* Release Frame Sync generator */
mcasp_set_ctl_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, TXFSRST);
/* enable transmit IRQs */
mcasp_set_bits(mcasp, DAVINCI_MCASP_EVTCTLX_REG,
mcasp->irq_request[SNDRV_PCM_STREAM_PLAYBACK]);
}
static void davinci_mcasp_start(struct davinci_mcasp *mcasp, int stream)
{
mcasp->streams++;
if (stream == SNDRV_PCM_STREAM_PLAYBACK)
mcasp_start_tx(mcasp);
else
mcasp_start_rx(mcasp);
}
static void mcasp_stop_rx(struct davinci_mcasp *mcasp)
{
/* disable IRQ sources */
mcasp_clr_bits(mcasp, DAVINCI_MCASP_EVTCTLR_REG,
mcasp->irq_request[SNDRV_PCM_STREAM_CAPTURE]);
/*
* In synchronous mode stop the TX clocks if no other stream is
* running
*/
if (mcasp_is_synchronous(mcasp) && !mcasp->streams)
mcasp_set_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, 0);
mcasp_set_reg(mcasp, DAVINCI_MCASP_GBLCTLR_REG, 0);
mcasp_set_reg(mcasp, DAVINCI_MCASP_RXSTAT_REG, 0xFFFFFFFF);
if (mcasp->rxnumevt) { /* disable FIFO */
u32 reg = mcasp->fifo_base + MCASP_RFIFOCTL_OFFSET;
mcasp_clr_bits(mcasp, reg, FIFO_ENABLE);
}
}
static void mcasp_stop_tx(struct davinci_mcasp *mcasp)
{
u32 val = 0;
/* disable IRQ sources */
mcasp_clr_bits(mcasp, DAVINCI_MCASP_EVTCTLX_REG,
mcasp->irq_request[SNDRV_PCM_STREAM_PLAYBACK]);
/*
* In synchronous mode keep TX clocks running if the capture stream is
* still running.
*/
if (mcasp_is_synchronous(mcasp) && mcasp->streams)
val = TXHCLKRST | TXCLKRST | TXFSRST;
mcasp_set_reg(mcasp, DAVINCI_MCASP_GBLCTLX_REG, val);
mcasp_set_reg(mcasp, DAVINCI_MCASP_TXSTAT_REG, 0xFFFFFFFF);
if (mcasp->txnumevt) { /* disable FIFO */
u32 reg = mcasp->fifo_base + MCASP_WFIFOCTL_OFFSET;
mcasp_clr_bits(mcasp, reg, FIFO_ENABLE);
}
}
static void davinci_mcasp_stop(struct davinci_mcasp *mcasp, int stream)
{
mcasp->streams--;
if (stream == SNDRV_PCM_STREAM_PLAYBACK)
mcasp_stop_tx(mcasp);
else
mcasp_stop_rx(mcasp);
}
static irqreturn_t davinci_mcasp_tx_irq_handler(int irq, void *data)
{
struct davinci_mcasp *mcasp = (struct davinci_mcasp *)data;
struct snd_pcm_substream *substream;
u32 irq_mask = mcasp->irq_request[SNDRV_PCM_STREAM_PLAYBACK];
u32 handled_mask = 0;
u32 stat;
stat = mcasp_get_reg(mcasp, DAVINCI_MCASP_TXSTAT_REG);
if (stat & XUNDRN & irq_mask) {
dev_warn(mcasp->dev, "Transmit buffer underflow\n");
handled_mask |= XUNDRN;
substream = mcasp->substreams[SNDRV_PCM_STREAM_PLAYBACK];
if (substream) {
snd_pcm_stream_lock_irq(substream);
if (snd_pcm_running(substream))
snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
snd_pcm_stream_unlock_irq(substream);
}
}
if (!handled_mask)
dev_warn(mcasp->dev, "unhandled tx event. txstat: 0x%08x\n",
stat);
if (stat & XRERR)
handled_mask |= XRERR;
/* Ack the handled event only */
mcasp_set_reg(mcasp, DAVINCI_MCASP_TXSTAT_REG, handled_mask);
return IRQ_RETVAL(handled_mask);
}
static irqreturn_t davinci_mcasp_rx_irq_handler(int irq, void *data)
{
struct davinci_mcasp *mcasp = (struct davinci_mcasp *)data;
struct snd_pcm_substream *substream;
u32 irq_mask = mcasp->irq_request[SNDRV_PCM_STREAM_CAPTURE];
u32 handled_mask = 0;
u32 stat;
stat = mcasp_get_reg(mcasp, DAVINCI_MCASP_RXSTAT_REG);
if (stat & ROVRN & irq_mask) {
dev_warn(mcasp->dev, "Receive buffer overflow\n");
handled_mask |= ROVRN;
substream = mcasp->substreams[SNDRV_PCM_STREAM_CAPTURE];
if (substream) {
snd_pcm_stream_lock_irq(substream);
if (snd_pcm_running(substream))
snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
snd_pcm_stream_unlock_irq(substream);
}
}
if (!handled_mask)
dev_warn(mcasp->dev, "unhandled rx event. rxstat: 0x%08x\n",
stat);
if (stat & XRERR)
handled_mask |= XRERR;
/* Ack the handled event only */
mcasp_set_reg(mcasp, DAVINCI_MCASP_RXSTAT_REG, handled_mask);
return IRQ_RETVAL(handled_mask);
}
static irqreturn_t davinci_mcasp_common_irq_handler(int irq, void *data)
{
struct davinci_mcasp *mcasp = (struct davinci_mcasp *)data;
irqreturn_t ret = IRQ_NONE;
if (mcasp->substreams[SNDRV_PCM_STREAM_PLAYBACK])
ret = davinci_mcasp_tx_irq_handler(irq, data);
if (mcasp->substreams[SNDRV_PCM_STREAM_CAPTURE])
ret |= davinci_mcasp_rx_irq_handler(irq, data);
return ret;
}
static int davinci_mcasp_set_dai_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(cpu_dai);
int ret = 0;
u32 data_delay;
bool fs_pol_rising;
bool inv_fs = false;
if (!fmt)
return 0;
pm_runtime_get_sync(mcasp->dev);
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_DSP_A:
mcasp_clr_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, FSXDUR);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, FSRDUR);
/* 1st data bit occur one ACLK cycle after the frame sync */
data_delay = 1;
break;
case SND_SOC_DAIFMT_DSP_B:
case SND_SOC_DAIFMT_AC97:
mcasp_clr_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, FSXDUR);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, FSRDUR);
/* No delay after FS */
data_delay = 0;
break;
case SND_SOC_DAIFMT_I2S:
/* configure a full-word SYNC pulse (LRCLK) */
mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, FSXDUR);
mcasp_set_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, FSRDUR);
/* 1st data bit occur one ACLK cycle after the frame sync */
data_delay = 1;
/* FS need to be inverted */
inv_fs = true;
break;
case SND_SOC_DAIFMT_LEFT_J:
/* configure a full-word SYNC pulse (LRCLK) */
mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, FSXDUR);
mcasp_set_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, FSRDUR);
/* No delay after FS */
data_delay = 0;
break;
default:
ret = -EINVAL;
goto out;
}
mcasp_mod_bits(mcasp, DAVINCI_MCASP_TXFMT_REG, FSXDLY(data_delay),
FSXDLY(3));
mcasp_mod_bits(mcasp, DAVINCI_MCASP_RXFMT_REG, FSRDLY(data_delay),
FSRDLY(3));
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
/* codec is clock and frame slave */
mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXE);
mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, AFSXE);
mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG, ACLKRE);
mcasp_set_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, AFSRE);
mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, ACLKX | ACLKR);
mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AFSX | AFSR);
mcasp->bclk_master = 1;
break;
case SND_SOC_DAIFMT_CBS_CFM:
/* codec is clock slave and frame master */
mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXE);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, AFSXE);
mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG, ACLKRE);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, AFSRE);
mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, ACLKX | ACLKR);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AFSX | AFSR);
mcasp->bclk_master = 1;
break;
case SND_SOC_DAIFMT_CBM_CFS:
/* codec is clock master and frame slave */
mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXE);
mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, AFSXE);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG, ACLKRE);
mcasp_set_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, AFSRE);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, ACLKX | ACLKR);
mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AFSX | AFSR);
mcasp->bclk_master = 0;
break;
case SND_SOC_DAIFMT_CBM_CFM:
/* codec is clock and frame master */
mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXE);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, AFSXE);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG, ACLKRE);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, AFSRE);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG,
ACLKX | AFSX | ACLKR | AHCLKR | AFSR);
mcasp->bclk_master = 0;
break;
default:
ret = -EINVAL;
goto out;
}
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_IB_NF:
mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXPOL);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG, ACLKRPOL);
fs_pol_rising = true;
break;
case SND_SOC_DAIFMT_NB_IF:
mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXPOL);
mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG, ACLKRPOL);
fs_pol_rising = false;
break;
case SND_SOC_DAIFMT_IB_IF:
mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXPOL);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG, ACLKRPOL);
fs_pol_rising = false;
break;
case SND_SOC_DAIFMT_NB_NF:
mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXPOL);
mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG, ACLKRPOL);
fs_pol_rising = true;
break;
default:
ret = -EINVAL;
goto out;
}
if (inv_fs)
fs_pol_rising = !fs_pol_rising;
if (fs_pol_rising) {
mcasp_clr_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, FSXPOL);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, FSRPOL);
} else {
mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG, FSXPOL);
mcasp_set_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG, FSRPOL);
}
mcasp->dai_fmt = fmt;
out:
pm_runtime_put(mcasp->dev);
return ret;
}
static int __davinci_mcasp_set_clkdiv(struct davinci_mcasp *mcasp, int div_id,
int div, bool explicit)
{
pm_runtime_get_sync(mcasp->dev);
switch (div_id) {
case MCASP_CLKDIV_AUXCLK: /* MCLK divider */
mcasp_mod_bits(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG,
AHCLKXDIV(div - 1), AHCLKXDIV_MASK);
mcasp_mod_bits(mcasp, DAVINCI_MCASP_AHCLKRCTL_REG,
AHCLKRDIV(div - 1), AHCLKRDIV_MASK);
break;
case MCASP_CLKDIV_BCLK: /* BCLK divider */
mcasp_mod_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG,
ACLKXDIV(div - 1), ACLKXDIV_MASK);
mcasp_mod_bits(mcasp, DAVINCI_MCASP_ACLKRCTL_REG,
ACLKRDIV(div - 1), ACLKRDIV_MASK);
if (explicit)
mcasp->bclk_div = div;
break;
case MCASP_CLKDIV_BCLK_FS_RATIO:
/*
* BCLK/LRCLK ratio descries how many bit-clock cycles
* fit into one frame. The clock ratio is given for a
* full period of data (for I2S format both left and
* right channels), so it has to be divided by number
* of tdm-slots (for I2S - divided by 2).
* Instead of storing this ratio, we calculate a new
* tdm_slot width by dividing the the ratio by the
* number of configured tdm slots.
*/
mcasp->slot_width = div / mcasp->tdm_slots;
if (div % mcasp->tdm_slots)
dev_warn(mcasp->dev,
"%s(): BCLK/LRCLK %d is not divisible by %d tdm slots",
__func__, div, mcasp->tdm_slots);
break;
default:
return -EINVAL;
}
pm_runtime_put(mcasp->dev);
return 0;
}
static int davinci_mcasp_set_clkdiv(struct snd_soc_dai *dai, int div_id,
int div)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
return __davinci_mcasp_set_clkdiv(mcasp, div_id, div, 1);
}
static int davinci_mcasp_set_sysclk(struct snd_soc_dai *dai, int clk_id,
unsigned int freq, int dir)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
pm_runtime_get_sync(mcasp->dev);
if (dir == SND_SOC_CLOCK_OUT) {
mcasp_set_bits(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG, AHCLKXE);
mcasp_set_bits(mcasp, DAVINCI_MCASP_AHCLKRCTL_REG, AHCLKRE);
mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AHCLKX);
} else {
mcasp_clr_bits(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG, AHCLKXE);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_AHCLKRCTL_REG, AHCLKRE);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AHCLKX);
}
mcasp->sysclk_freq = freq;
pm_runtime_put(mcasp->dev);
return 0;
}
/* All serializers must have equal number of channels */
static int davinci_mcasp_ch_constraint(struct davinci_mcasp *mcasp, int stream,
int serializers)
{
struct snd_pcm_hw_constraint_list *cl = &mcasp->chconstr[stream];
unsigned int *list = (unsigned int *) cl->list;
int slots = mcasp->tdm_slots;
int i, count = 0;
if (mcasp->tdm_mask[stream])
slots = hweight32(mcasp->tdm_mask[stream]);
for (i = 2; i <= slots; i++)
list[count++] = i;
for (i = 2; i <= serializers; i++)
list[count++] = i*slots;
cl->count = count;
return 0;
}
static int davinci_mcasp_set_ch_constraints(struct davinci_mcasp *mcasp)
{
int rx_serializers = 0, tx_serializers = 0, ret, i;
for (i = 0; i < mcasp->num_serializer; i++)
if (mcasp->serial_dir[i] == TX_MODE)
tx_serializers++;
else if (mcasp->serial_dir[i] == RX_MODE)
rx_serializers++;
ret = davinci_mcasp_ch_constraint(mcasp, SNDRV_PCM_STREAM_PLAYBACK,
tx_serializers);
if (ret)
return ret;
ret = davinci_mcasp_ch_constraint(mcasp, SNDRV_PCM_STREAM_CAPTURE,
rx_serializers);
return ret;
}
static int davinci_mcasp_set_tdm_slot(struct snd_soc_dai *dai,
unsigned int tx_mask,
unsigned int rx_mask,
int slots, int slot_width)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
dev_dbg(mcasp->dev,
"%s() tx_mask 0x%08x rx_mask 0x%08x slots %d width %d\n",
__func__, tx_mask, rx_mask, slots, slot_width);
if (tx_mask >= (1<<slots) || rx_mask >= (1<<slots)) {
dev_err(mcasp->dev,
"Bad tdm mask tx: 0x%08x rx: 0x%08x slots %d\n",
tx_mask, rx_mask, slots);
return -EINVAL;
}
if (slot_width &&
(slot_width < 8 || slot_width > 32 || slot_width % 4 != 0)) {
dev_err(mcasp->dev, "%s: Unsupported slot_width %d\n",
__func__, slot_width);
return -EINVAL;
}
mcasp->tdm_slots = slots;
mcasp->tdm_mask[SNDRV_PCM_STREAM_PLAYBACK] = tx_mask;
mcasp->tdm_mask[SNDRV_PCM_STREAM_CAPTURE] = rx_mask;
mcasp->slot_width = slot_width;
return davinci_mcasp_set_ch_constraints(mcasp);
}
static int davinci_config_channel_size(struct davinci_mcasp *mcasp,
int sample_width)
{
u32 fmt;
u32 tx_rotate = (sample_width / 4) & 0x7;
u32 mask = (1ULL << sample_width) - 1;
u32 slot_width = sample_width;
/*
* For captured data we should not rotate, inversion and masking is
* enoguh to get the data to the right position:
* Format data from bus after reverse (XRBUF)
* S16_LE: |LSB|MSB|xxx|xxx| |xxx|xxx|MSB|LSB|
* S24_3LE: |LSB|DAT|MSB|xxx| |xxx|MSB|DAT|LSB|
* S24_LE: |LSB|DAT|MSB|xxx| |xxx|MSB|DAT|LSB|
* S32_LE: |LSB|DAT|DAT|MSB| |MSB|DAT|DAT|LSB|
*/
u32 rx_rotate = 0;
/*
* Setting the tdm slot width either with set_clkdiv() or
* set_tdm_slot() allows us to for example send 32 bits per
* channel to the codec, while only 16 of them carry audio
* payload.
*/
if (mcasp->slot_width) {
/*
* When we have more bclk then it is needed for the
* data, we need to use the rotation to move the
* received samples to have correct alignment.
*/
slot_width = mcasp->slot_width;
rx_rotate = (slot_width - sample_width) / 4;
}
/* mapping of the XSSZ bit-field as described in the datasheet */
fmt = (slot_width >> 1) - 1;
if (mcasp->op_mode != DAVINCI_MCASP_DIT_MODE) {
mcasp_mod_bits(mcasp, DAVINCI_MCASP_RXFMT_REG, RXSSZ(fmt),
RXSSZ(0x0F));
mcasp_mod_bits(mcasp, DAVINCI_MCASP_TXFMT_REG, TXSSZ(fmt),
TXSSZ(0x0F));
mcasp_mod_bits(mcasp, DAVINCI_MCASP_TXFMT_REG, TXROT(tx_rotate),
TXROT(7));
mcasp_mod_bits(mcasp, DAVINCI_MCASP_RXFMT_REG, RXROT(rx_rotate),
RXROT(7));
mcasp_set_reg(mcasp, DAVINCI_MCASP_RXMASK_REG, mask);
}
mcasp_set_reg(mcasp, DAVINCI_MCASP_TXMASK_REG, mask);
return 0;
}
static int mcasp_common_hw_param(struct davinci_mcasp *mcasp, int stream,
int period_words, int channels)
{
struct snd_dmaengine_dai_dma_data *dma_data = &mcasp->dma_data[stream];
int i;
u8 tx_ser = 0;
u8 rx_ser = 0;
u8 slots = mcasp->tdm_slots;
u8 max_active_serializers = (channels + slots - 1) / slots;
int active_serializers, numevt;
u32 reg;
/* Default configuration */
if (mcasp->version < MCASP_VERSION_3)
mcasp_set_bits(mcasp, DAVINCI_MCASP_PWREMUMGT_REG, MCASP_SOFT);
/* All PINS as McASP */
mcasp_set_reg(mcasp, DAVINCI_MCASP_PFUNC_REG, 0x00000000);
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
mcasp_set_reg(mcasp, DAVINCI_MCASP_TXSTAT_REG, 0xFFFFFFFF);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_XEVTCTL_REG, TXDATADMADIS);
} else {
mcasp_set_reg(mcasp, DAVINCI_MCASP_RXSTAT_REG, 0xFFFFFFFF);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_REVTCTL_REG, RXDATADMADIS);
}
for (i = 0; i < mcasp->num_serializer; i++) {
mcasp_set_bits(mcasp, DAVINCI_MCASP_XRSRCTL_REG(i),
mcasp->serial_dir[i]);
if (mcasp->serial_dir[i] == TX_MODE &&
tx_ser < max_active_serializers) {
mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AXR(i));
mcasp_mod_bits(mcasp, DAVINCI_MCASP_XRSRCTL_REG(i),
DISMOD_LOW, DISMOD_MASK);
tx_ser++;
} else if (mcasp->serial_dir[i] == RX_MODE &&
rx_ser < max_active_serializers) {
mcasp_clr_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AXR(i));
rx_ser++;
} else {
mcasp_mod_bits(mcasp, DAVINCI_MCASP_XRSRCTL_REG(i),
SRMOD_INACTIVE, SRMOD_MASK);
}
}
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
active_serializers = tx_ser;
numevt = mcasp->txnumevt;
reg = mcasp->fifo_base + MCASP_WFIFOCTL_OFFSET;
} else {
active_serializers = rx_ser;
numevt = mcasp->rxnumevt;
reg = mcasp->fifo_base + MCASP_RFIFOCTL_OFFSET;
}
if (active_serializers < max_active_serializers) {
dev_warn(mcasp->dev, "stream has more channels (%d) than are "
"enabled in mcasp (%d)\n", channels,
active_serializers * slots);
return -EINVAL;
}
/* AFIFO is not in use */
if (!numevt) {
/* Configure the burst size for platform drivers */
if (active_serializers > 1) {
/*
* If more than one serializers are in use we have one
* DMA request to provide data for all serializers.
* For example if three serializers are enabled the DMA
* need to transfer three words per DMA request.
*/
dma_data->maxburst = active_serializers;
} else {
dma_data->maxburst = 0;
}
return 0;
}
if (period_words % active_serializers) {
dev_err(mcasp->dev, "Invalid combination of period words and "
"active serializers: %d, %d\n", period_words,
active_serializers);
return -EINVAL;
}
/*
* Calculate the optimal AFIFO depth for platform side:
* The number of words for numevt need to be in steps of active
* serializers.
*/
numevt = (numevt / active_serializers) * active_serializers;
while (period_words % numevt && numevt > 0)
numevt -= active_serializers;
if (numevt <= 0)
numevt = active_serializers;
mcasp_mod_bits(mcasp, reg, active_serializers, NUMDMA_MASK);
mcasp_mod_bits(mcasp, reg, NUMEVT(numevt), NUMEVT_MASK);
/* Configure the burst size for platform drivers */
if (numevt == 1)
numevt = 0;
dma_data->maxburst = numevt;
return 0;
}
static int mcasp_i2s_hw_param(struct davinci_mcasp *mcasp, int stream,
int channels)
{
int i, active_slots;
int total_slots;
int active_serializers;
u32 mask = 0;
u32 busel = 0;
total_slots = mcasp->tdm_slots;
/*
* If more than one serializer is needed, then use them with
* all the specified tdm_slots. Otherwise, one serializer can
* cope with the transaction using just as many slots as there
* are channels in the stream.
*/
if (mcasp->tdm_mask[stream]) {
active_slots = hweight32(mcasp->tdm_mask[stream]);
active_serializers = (channels + active_slots - 1) /
active_slots;
if (active_serializers == 1) {
active_slots = channels;
for (i = 0; i < total_slots; i++) {
if ((1 << i) & mcasp->tdm_mask[stream]) {
mask |= (1 << i);
if (--active_slots <= 0)
break;
}
}
}
} else {
active_serializers = (channels + total_slots - 1) / total_slots;
if (active_serializers == 1)
active_slots = channels;
else
active_slots = total_slots;
for (i = 0; i < active_slots; i++)
mask |= (1 << i);
}
mcasp_clr_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, TX_ASYNC);
if (!mcasp->dat_port)
busel = TXSEL;
if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
mcasp_set_reg(mcasp, DAVINCI_MCASP_TXTDM_REG, mask);
mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMT_REG, busel | TXORD);
mcasp_mod_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG,
FSXMOD(total_slots), FSXMOD(0x1FF));
} else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
mcasp_set_reg(mcasp, DAVINCI_MCASP_RXTDM_REG, mask);
mcasp_set_bits(mcasp, DAVINCI_MCASP_RXFMT_REG, busel | RXORD);
mcasp_mod_bits(mcasp, DAVINCI_MCASP_RXFMCTL_REG,
FSRMOD(total_slots), FSRMOD(0x1FF));
/*
* If McASP is set to be TX/RX synchronous and the playback is
* not running already we need to configure the TX slots in
* order to have correct FSX on the bus
*/
if (mcasp_is_synchronous(mcasp) && !mcasp->channels)
mcasp_mod_bits(mcasp, DAVINCI_MCASP_TXFMCTL_REG,
FSXMOD(total_slots), FSXMOD(0x1FF));
}
return 0;
}
/* S/PDIF */
static int mcasp_dit_hw_param(struct davinci_mcasp *mcasp,
unsigned int rate)
{
u32 cs_value = 0;
u8 *cs_bytes = (u8*) &cs_value;
/* Set the TX format : 24 bit right rotation, 32 bit slot, Pad 0
and LSB first */
mcasp_set_bits(mcasp, DAVINCI_MCASP_TXFMT_REG, TXROT(6) | TXSSZ(15));
/* Set TX frame synch : DIT Mode, 1 bit width, internal, rising edge */
mcasp_set_reg(mcasp, DAVINCI_MCASP_TXFMCTL_REG, AFSXE | FSXMOD(0x180));
/* Set the TX tdm : for all the slots */
mcasp_set_reg(mcasp, DAVINCI_MCASP_TXTDM_REG, 0xFFFFFFFF);
/* Set the TX clock controls : div = 1 and internal */
mcasp_set_bits(mcasp, DAVINCI_MCASP_ACLKXCTL_REG, ACLKXE | TX_ASYNC);
mcasp_clr_bits(mcasp, DAVINCI_MCASP_XEVTCTL_REG, TXDATADMADIS);
/* Only 44100 and 48000 are valid, both have the same setting */
mcasp_set_bits(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG, AHCLKXDIV(3));
/* Enable the DIT */
mcasp_set_bits(mcasp, DAVINCI_MCASP_TXDITCTL_REG, DITEN);
/* Set S/PDIF channel status bits */
cs_bytes[0] = IEC958_AES0_CON_NOT_COPYRIGHT;
cs_bytes[1] = IEC958_AES1_CON_PCM_CODER;
switch (rate) {
case 22050:
cs_bytes[3] |= IEC958_AES3_CON_FS_22050;
break;
case 24000:
cs_bytes[3] |= IEC958_AES3_CON_FS_24000;
break;
case 32000:
cs_bytes[3] |= IEC958_AES3_CON_FS_32000;
break;
case 44100:
cs_bytes[3] |= IEC958_AES3_CON_FS_44100;
break;
case 48000:
cs_bytes[3] |= IEC958_AES3_CON_FS_48000;
break;
case 88200:
cs_bytes[3] |= IEC958_AES3_CON_FS_88200;
break;
case 96000:
cs_bytes[3] |= IEC958_AES3_CON_FS_96000;
break;
case 176400:
cs_bytes[3] |= IEC958_AES3_CON_FS_176400;
break;
case 192000:
cs_bytes[3] |= IEC958_AES3_CON_FS_192000;
break;
default:
printk(KERN_WARNING "unsupported sampling rate: %d\n", rate);
return -EINVAL;
}
mcasp_set_reg(mcasp, DAVINCI_MCASP_DITCSRA_REG, cs_value);
mcasp_set_reg(mcasp, DAVINCI_MCASP_DITCSRB_REG, cs_value);
return 0;
}
static int davinci_mcasp_calc_clk_div(struct davinci_mcasp *mcasp,
unsigned int bclk_freq, bool set)
{
int error_ppm;
unsigned int sysclk_freq = mcasp->sysclk_freq;
u32 reg = mcasp_get_reg(mcasp, DAVINCI_MCASP_AHCLKXCTL_REG);
int div = sysclk_freq / bclk_freq;
int rem = sysclk_freq % bclk_freq;
int aux_div = 1;
if (div > (ACLKXDIV_MASK + 1)) {
if (reg & AHCLKXE) {
aux_div = div / (ACLKXDIV_MASK + 1);
if (div % (ACLKXDIV_MASK + 1))
aux_div++;
sysclk_freq /= aux_div;
div = sysclk_freq / bclk_freq;
rem = sysclk_freq % bclk_freq;
} else if (set) {
dev_warn(mcasp->dev, "Too fast reference clock (%u)\n",
sysclk_freq);
}
}
if (rem != 0) {
if (div == 0 ||
((sysclk_freq / div) - bclk_freq) >
(bclk_freq - (sysclk_freq / (div+1)))) {
div++;
rem = rem - bclk_freq;
}
}
error_ppm = (div*1000000 + (int)div64_long(1000000LL*rem,
(int)bclk_freq)) / div - 1000000;
if (set) {
if (error_ppm)
dev_info(mcasp->dev, "Sample-rate is off by %d PPM\n",
error_ppm);
__davinci_mcasp_set_clkdiv(mcasp, MCASP_CLKDIV_BCLK, div, 0);
if (reg & AHCLKXE)
__davinci_mcasp_set_clkdiv(mcasp, MCASP_CLKDIV_AUXCLK,
aux_div, 0);
}
return error_ppm;
}
static int davinci_mcasp_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *cpu_dai)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(cpu_dai);
int word_length;
int channels = params_channels(params);
int period_size = params_period_size(params);
int ret;
ret = davinci_mcasp_set_dai_fmt(cpu_dai, mcasp->dai_fmt);
if (ret)
return ret;
/*
* If mcasp is BCLK master, and a BCLK divider was not provided by
* the machine driver, we need to calculate the ratio.
*/
if (mcasp->bclk_master && mcasp->bclk_div == 0 && mcasp->sysclk_freq) {
int slots = mcasp->tdm_slots;
int rate = params_rate(params);
int sbits = params_width(params);
if (mcasp->slot_width)
sbits = mcasp->slot_width;
davinci_mcasp_calc_clk_div(mcasp, rate * sbits * slots, true);
}
ret = mcasp_common_hw_param(mcasp, substream->stream,
period_size * channels, channels);
if (ret)
return ret;
if (mcasp->op_mode == DAVINCI_MCASP_DIT_MODE)
ret = mcasp_dit_hw_param(mcasp, params_rate(params));
else
ret = mcasp_i2s_hw_param(mcasp, substream->stream,
channels);
if (ret)
return ret;
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_U8:
case SNDRV_PCM_FORMAT_S8:
word_length = 8;
break;
case SNDRV_PCM_FORMAT_U16_LE:
case SNDRV_PCM_FORMAT_S16_LE:
word_length = 16;
break;
case SNDRV_PCM_FORMAT_U24_3LE:
case SNDRV_PCM_FORMAT_S24_3LE:
word_length = 24;
break;
case SNDRV_PCM_FORMAT_U24_LE:
case SNDRV_PCM_FORMAT_S24_LE:
word_length = 24;
break;
case SNDRV_PCM_FORMAT_U32_LE:
case SNDRV_PCM_FORMAT_S32_LE:
word_length = 32;
break;
default:
printk(KERN_WARNING "davinci-mcasp: unsupported PCM format");
return -EINVAL;
}
davinci_config_channel_size(mcasp, word_length);
if (mcasp->op_mode == DAVINCI_MCASP_IIS_MODE)
mcasp->channels = channels;
return 0;
}
static int davinci_mcasp_trigger(struct snd_pcm_substream *substream,
int cmd, struct snd_soc_dai *cpu_dai)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(cpu_dai);
int ret = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
davinci_mcasp_start(mcasp, substream->stream);
break;
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
davinci_mcasp_stop(mcasp, substream->stream);
break;
default:
ret = -EINVAL;
}
return ret;
}
static const unsigned int davinci_mcasp_dai_rates[] = {
8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000,
88200, 96000, 176400, 192000,
};
#define DAVINCI_MAX_RATE_ERROR_PPM 1000
static int davinci_mcasp_hw_rule_rate(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct davinci_mcasp_ruledata *rd = rule->private;
struct snd_interval *ri =
hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
int sbits = params_width(params);
int slots = rd->mcasp->tdm_slots;
struct snd_interval range;
int i;
if (rd->mcasp->slot_width)
sbits = rd->mcasp->slot_width;
snd_interval_any(&range);
range.empty = 1;
for (i = 0; i < ARRAY_SIZE(davinci_mcasp_dai_rates); i++) {
if (snd_interval_test(ri, davinci_mcasp_dai_rates[i])) {
uint bclk_freq = sbits*slots*
davinci_mcasp_dai_rates[i];
int ppm;
ppm = davinci_mcasp_calc_clk_div(rd->mcasp, bclk_freq,
false);
if (abs(ppm) < DAVINCI_MAX_RATE_ERROR_PPM) {
if (range.empty) {
range.min = davinci_mcasp_dai_rates[i];
range.empty = 0;
}
range.max = davinci_mcasp_dai_rates[i];
}
}
}
dev_dbg(rd->mcasp->dev,
"Frequencies %d-%d -> %d-%d for %d sbits and %d tdm slots\n",
ri->min, ri->max, range.min, range.max, sbits, slots);
return snd_interval_refine(hw_param_interval(params, rule->var),
&range);
}
static int davinci_mcasp_hw_rule_format(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct davinci_mcasp_ruledata *rd = rule->private;
struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
struct snd_mask nfmt;
int rate = params_rate(params);
int slots = rd->mcasp->tdm_slots;
int i, count = 0;
snd_mask_none(&nfmt);
for (i = 0; i <= SNDRV_PCM_FORMAT_LAST; i++) {
if (snd_mask_test(fmt, i)) {
uint sbits = snd_pcm_format_width(i);
int ppm;
if (rd->mcasp->slot_width)
sbits = rd->mcasp->slot_width;
ppm = davinci_mcasp_calc_clk_div(rd->mcasp,
sbits * slots * rate,
false);
if (abs(ppm) < DAVINCI_MAX_RATE_ERROR_PPM) {
snd_mask_set(&nfmt, i);
count++;
}
}
}
dev_dbg(rd->mcasp->dev,
"%d possible sample format for %d Hz and %d tdm slots\n",
count, rate, slots);
return snd_mask_refine(fmt, &nfmt);
}
static int davinci_mcasp_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(cpu_dai);
struct davinci_mcasp_ruledata *ruledata =
&mcasp->ruledata[substream->stream];
u32 max_channels = 0;
int i, dir;
int tdm_slots = mcasp->tdm_slots;
/* Do not allow more then one stream per direction */
if (mcasp->substreams[substream->stream])
return -EBUSY;
mcasp->substreams[substream->stream] = substream;
if (mcasp->tdm_mask[substream->stream])
tdm_slots = hweight32(mcasp->tdm_mask[substream->stream]);
if (mcasp->op_mode == DAVINCI_MCASP_DIT_MODE)
return 0;
/*
* Limit the maximum allowed channels for the first stream:
* number of serializers for the direction * tdm slots per serializer
*/
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
dir = TX_MODE;
else
dir = RX_MODE;
for (i = 0; i < mcasp->num_serializer; i++) {
if (mcasp->serial_dir[i] == dir)
max_channels++;
}
ruledata->serializers = max_channels;
max_channels *= tdm_slots;
/*
* If the already active stream has less channels than the calculated
* limnit based on the seirializers * tdm_slots, we need to use that as
* a constraint for the second stream.
* Otherwise (first stream or less allowed channels) we use the
* calculated constraint.
*/
if (mcasp->channels && mcasp->channels < max_channels)
max_channels = mcasp->channels;
/*
* But we can always allow channels upto the amount of
* the available tdm_slots.
*/
if (max_channels < tdm_slots)
max_channels = tdm_slots;
snd_pcm_hw_constraint_minmax(substream->runtime,
SNDRV_PCM_HW_PARAM_CHANNELS,
2, max_channels);
snd_pcm_hw_constraint_list(substream->runtime,
0, SNDRV_PCM_HW_PARAM_CHANNELS,
&mcasp->chconstr[substream->stream]);
if (mcasp->slot_width)
snd_pcm_hw_constraint_minmax(substream->runtime,
SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
8, mcasp->slot_width);
/*
* If we rely on implicit BCLK divider setting we should
* set constraints based on what we can provide.
*/
if (mcasp->bclk_master && mcasp->bclk_div == 0 && mcasp->sysclk_freq) {
int ret;
ruledata->mcasp = mcasp;
ret = snd_pcm_hw_rule_add(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_RATE,
davinci_mcasp_hw_rule_rate,
ruledata,
SNDRV_PCM_HW_PARAM_FORMAT, -1);
if (ret)
return ret;
ret = snd_pcm_hw_rule_add(substream->runtime, 0,
SNDRV_PCM_HW_PARAM_FORMAT,
davinci_mcasp_hw_rule_format,
ruledata,
SNDRV_PCM_HW_PARAM_RATE, -1);
if (ret)
return ret;
}
return 0;
}
static void davinci_mcasp_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *cpu_dai)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(cpu_dai);
mcasp->substreams[substream->stream] = NULL;
if (mcasp->op_mode == DAVINCI_MCASP_DIT_MODE)
return;
if (!cpu_dai->active)
mcasp->channels = 0;
}
static const struct snd_soc_dai_ops davinci_mcasp_dai_ops = {
.startup = davinci_mcasp_startup,
.shutdown = davinci_mcasp_shutdown,
.trigger = davinci_mcasp_trigger,
.hw_params = davinci_mcasp_hw_params,
.set_fmt = davinci_mcasp_set_dai_fmt,
.set_clkdiv = davinci_mcasp_set_clkdiv,
.set_sysclk = davinci_mcasp_set_sysclk,
.set_tdm_slot = davinci_mcasp_set_tdm_slot,
};
static int davinci_mcasp_dai_probe(struct snd_soc_dai *dai)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
dai->playback_dma_data = &mcasp->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
dai->capture_dma_data = &mcasp->dma_data[SNDRV_PCM_STREAM_CAPTURE];
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int davinci_mcasp_suspend(struct snd_soc_dai *dai)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
struct davinci_mcasp_context *context = &mcasp->context;
u32 reg;
int i;
context->pm_state = pm_runtime_active(mcasp->dev);
if (!context->pm_state)
pm_runtime_get_sync(mcasp->dev);
for (i = 0; i < ARRAY_SIZE(context_regs); i++)
context->config_regs[i] = mcasp_get_reg(mcasp, context_regs[i]);
if (mcasp->txnumevt) {
reg = mcasp->fifo_base + MCASP_WFIFOCTL_OFFSET;
context->afifo_regs[0] = mcasp_get_reg(mcasp, reg);
}
if (mcasp->rxnumevt) {
reg = mcasp->fifo_base + MCASP_RFIFOCTL_OFFSET;
context->afifo_regs[1] = mcasp_get_reg(mcasp, reg);
}
for (i = 0; i < mcasp->num_serializer; i++)
context->xrsr_regs[i] = mcasp_get_reg(mcasp,
DAVINCI_MCASP_XRSRCTL_REG(i));
pm_runtime_put_sync(mcasp->dev);
return 0;
}
static int davinci_mcasp_resume(struct snd_soc_dai *dai)
{
struct davinci_mcasp *mcasp = snd_soc_dai_get_drvdata(dai);
struct davinci_mcasp_context *context = &mcasp->context;
u32 reg;
int i;
pm_runtime_get_sync(mcasp->dev);
for (i = 0; i < ARRAY_SIZE(context_regs); i++)
mcasp_set_reg(mcasp, context_regs[i], context->config_regs[i]);
if (mcasp->txnumevt) {
reg = mcasp->fifo_base + MCASP_WFIFOCTL_OFFSET;
mcasp_set_reg(mcasp, reg, context->afifo_regs[0]);
}
if (mcasp->rxnumevt) {
reg = mcasp->fifo_base + MCASP_RFIFOCTL_OFFSET;
mcasp_set_reg(mcasp, reg, context->afifo_regs[1]);
}
for (i = 0; i < mcasp->num_serializer; i++)
mcasp_set_reg(mcasp, DAVINCI_MCASP_XRSRCTL_REG(i),
context->xrsr_regs[i]);
if (!context->pm_state)
pm_runtime_put_sync(mcasp->dev);
return 0;
}
#else
#define davinci_mcasp_suspend NULL
#define davinci_mcasp_resume NULL
#endif
#define DAVINCI_MCASP_RATES SNDRV_PCM_RATE_8000_192000
#define DAVINCI_MCASP_PCM_FMTS (SNDRV_PCM_FMTBIT_S8 | \
SNDRV_PCM_FMTBIT_U8 | \
SNDRV_PCM_FMTBIT_S16_LE | \
SNDRV_PCM_FMTBIT_U16_LE | \
SNDRV_PCM_FMTBIT_S24_LE | \
SNDRV_PCM_FMTBIT_U24_LE | \
SNDRV_PCM_FMTBIT_S24_3LE | \
SNDRV_PCM_FMTBIT_U24_3LE | \
SNDRV_PCM_FMTBIT_S32_LE | \
SNDRV_PCM_FMTBIT_U32_LE)
static struct snd_soc_dai_driver davinci_mcasp_dai[] = {
{
.name = "davinci-mcasp.0",
.probe = davinci_mcasp_dai_probe,
.suspend = davinci_mcasp_suspend,
.resume = davinci_mcasp_resume,
.playback = {
.channels_min = 2,
.channels_max = 32 * 16,
.rates = DAVINCI_MCASP_RATES,
.formats = DAVINCI_MCASP_PCM_FMTS,
},
.capture = {
.channels_min = 2,
.channels_max = 32 * 16,
.rates = DAVINCI_MCASP_RATES,
.formats = DAVINCI_MCASP_PCM_FMTS,
},
.ops = &davinci_mcasp_dai_ops,
.symmetric_samplebits = 1,
.symmetric_rates = 1,
},
{
.name = "davinci-mcasp.1",
.probe = davinci_mcasp_dai_probe,
.playback = {
.channels_min = 1,
.channels_max = 384,
.rates = DAVINCI_MCASP_RATES,
.formats = DAVINCI_MCASP_PCM_FMTS,
},
.ops = &davinci_mcasp_dai_ops,
},
};
static const struct snd_soc_component_driver davinci_mcasp_component = {
.name = "davinci-mcasp",
};
/* Some HW specific values and defaults. The rest is filled in from DT. */
static struct davinci_mcasp_pdata dm646x_mcasp_pdata = {
.tx_dma_offset = 0x400,
.rx_dma_offset = 0x400,
.version = MCASP_VERSION_1,
};
static struct davinci_mcasp_pdata da830_mcasp_pdata = {
.tx_dma_offset = 0x2000,
.rx_dma_offset = 0x2000,
.version = MCASP_VERSION_2,
};
static struct davinci_mcasp_pdata am33xx_mcasp_pdata = {
.tx_dma_offset = 0,
.rx_dma_offset = 0,
.version = MCASP_VERSION_3,
};
static struct davinci_mcasp_pdata dra7_mcasp_pdata = {
/* The CFG port offset will be calculated if it is needed */
.tx_dma_offset = 0,
.rx_dma_offset = 0,
.version = MCASP_VERSION_4,
};
static const struct of_device_id mcasp_dt_ids[] = {
{
.compatible = "ti,dm646x-mcasp-audio",
.data = &dm646x_mcasp_pdata,
},
{
.compatible = "ti,da830-mcasp-audio",
.data = &da830_mcasp_pdata,
},
{
.compatible = "ti,am33xx-mcasp-audio",
.data = &am33xx_mcasp_pdata,
},
{
.compatible = "ti,dra7-mcasp-audio",
.data = &dra7_mcasp_pdata,
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, mcasp_dt_ids);
static int mcasp_reparent_fck(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
struct clk *gfclk, *parent_clk;
const char *parent_name;
int ret;
if (!node)
return 0;
parent_name = of_get_property(node, "fck_parent", NULL);
if (!parent_name)
return 0;
dev_warn(&pdev->dev, "Update the bindings to use assigned-clocks!\n");
gfclk = clk_get(&pdev->dev, "fck");
if (IS_ERR(gfclk)) {
dev_err(&pdev->dev, "failed to get fck\n");
return PTR_ERR(gfclk);
}
parent_clk = clk_get(NULL, parent_name);
if (IS_ERR(parent_clk)) {
dev_err(&pdev->dev, "failed to get parent clock\n");
ret = PTR_ERR(parent_clk);
goto err1;
}
ret = clk_set_parent(gfclk, parent_clk);
if (ret) {
dev_err(&pdev->dev, "failed to reparent fck\n");
goto err2;
}
err2:
clk_put(parent_clk);
err1:
clk_put(gfclk);
return ret;
}
static struct davinci_mcasp_pdata *davinci_mcasp_set_pdata_from_of(
struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct davinci_mcasp_pdata *pdata = NULL;
const struct of_device_id *match =
of_match_device(mcasp_dt_ids, &pdev->dev);
struct of_phandle_args dma_spec;
const u32 *of_serial_dir32;
u32 val;
int i, ret = 0;
if (pdev->dev.platform_data) {
pdata = pdev->dev.platform_data;
return pdata;
} else if (match) {
pdata = devm_kmemdup(&pdev->dev, match->data, sizeof(*pdata),
GFP_KERNEL);
if (!pdata) {
dev_err(&pdev->dev,
"Failed to allocate memory for pdata\n");
ret = -ENOMEM;
return pdata;
}
} else {
/* control shouldn't reach here. something is wrong */
ret = -EINVAL;
goto nodata;
}
ret = of_property_read_u32(np, "op-mode", &val);
if (ret >= 0)
pdata->op_mode = val;
ret = of_property_read_u32(np, "tdm-slots", &val);
if (ret >= 0) {
if (val < 2 || val > 32) {
dev_err(&pdev->dev,
"tdm-slots must be in rage [2-32]\n");
ret = -EINVAL;
goto nodata;
}
pdata->tdm_slots = val;
}
of_serial_dir32 = of_get_property(np, "serial-dir", &val);
val /= sizeof(u32);
if (of_serial_dir32) {
u8 *of_serial_dir = devm_kzalloc(&pdev->dev,
(sizeof(*of_serial_dir) * val),
GFP_KERNEL);
if (!of_serial_dir) {
ret = -ENOMEM;
goto nodata;
}
for (i = 0; i < val; i++)
of_serial_dir[i] = be32_to_cpup(&of_serial_dir32[i]);
pdata->num_serializer = val;
pdata->serial_dir = of_serial_dir;
}
ret = of_property_match_string(np, "dma-names", "tx");
if (ret < 0)
goto nodata;
ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", ret,
&dma_spec);
if (ret < 0)
goto nodata;
pdata->tx_dma_channel = dma_spec.args[0];
/* RX is not valid in DIT mode */
if (pdata->op_mode != DAVINCI_MCASP_DIT_MODE) {
ret = of_property_match_string(np, "dma-names", "rx");
if (ret < 0)
goto nodata;
ret = of_parse_phandle_with_args(np, "dmas", "#dma-cells", ret,
&dma_spec);
if (ret < 0)
goto nodata;
pdata->rx_dma_channel = dma_spec.args[0];
}
ret = of_property_read_u32(np, "tx-num-evt", &val);
if (ret >= 0)
pdata->txnumevt = val;
ret = of_property_read_u32(np, "rx-num-evt", &val);
if (ret >= 0)
pdata->rxnumevt = val;
ret = of_property_read_u32(np, "sram-size-playback", &val);
if (ret >= 0)
pdata->sram_size_playback = val;
ret = of_property_read_u32(np, "sram-size-capture", &val);
if (ret >= 0)
pdata->sram_size_capture = val;
return pdata;
nodata:
if (ret < 0) {
dev_err(&pdev->dev, "Error populating platform data, err %d\n",
ret);
pdata = NULL;
}
return pdata;
}
enum {
PCM_EDMA,
PCM_SDMA,
};
static const char *sdma_prefix = "ti,omap";
static int davinci_mcasp_get_dma_type(struct davinci_mcasp *mcasp)
{
struct dma_chan *chan;
const char *tmp;
int ret = PCM_EDMA;
if (!mcasp->dev->of_node)
return PCM_EDMA;
tmp = mcasp->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data;
chan = dma_request_slave_channel_reason(mcasp->dev, tmp);
if (IS_ERR(chan)) {
if (PTR_ERR(chan) != -EPROBE_DEFER)
dev_err(mcasp->dev,
"Can't verify DMA configuration (%ld)\n",
PTR_ERR(chan));
return PTR_ERR(chan);
}
BUG_ON(!chan->device || !chan->device->dev);
if (chan->device->dev->of_node)
ret = of_property_read_string(chan->device->dev->of_node,
"compatible", &tmp);
else
dev_dbg(mcasp->dev, "DMA controller has no of-node\n");
dma_release_channel(chan);
if (ret)
return ret;
dev_dbg(mcasp->dev, "DMA controller compatible = \"%s\"\n", tmp);
if (!strncmp(tmp, sdma_prefix, strlen(sdma_prefix)))
return PCM_SDMA;
return PCM_EDMA;
}
static u32 davinci_mcasp_txdma_offset(struct davinci_mcasp_pdata *pdata)
{
int i;
u32 offset = 0;
if (pdata->version != MCASP_VERSION_4)
return pdata->tx_dma_offset;
for (i = 0; i < pdata->num_serializer; i++) {
if (pdata->serial_dir[i] == TX_MODE) {
if (!offset) {
offset = DAVINCI_MCASP_TXBUF_REG(i);
} else {
pr_err("%s: Only one serializer allowed!\n",
__func__);
break;
}
}
}
return offset;
}
static u32 davinci_mcasp_rxdma_offset(struct davinci_mcasp_pdata *pdata)
{
int i;
u32 offset = 0;
if (pdata->version != MCASP_VERSION_4)
return pdata->rx_dma_offset;
for (i = 0; i < pdata->num_serializer; i++) {
if (pdata->serial_dir[i] == RX_MODE) {
if (!offset) {
offset = DAVINCI_MCASP_RXBUF_REG(i);
} else {
pr_err("%s: Only one serializer allowed!\n",
__func__);
break;
}
}
}
return offset;
}
static int davinci_mcasp_probe(struct platform_device *pdev)
{
struct snd_dmaengine_dai_dma_data *dma_data;
struct resource *mem, *res, *dat;
struct davinci_mcasp_pdata *pdata;
struct davinci_mcasp *mcasp;
char *irq_name;
int *dma;
int irq;
int ret;
if (!pdev->dev.platform_data && !pdev->dev.of_node) {
dev_err(&pdev->dev, "No platform data supplied\n");
return -EINVAL;
}
mcasp = devm_kzalloc(&pdev->dev, sizeof(struct davinci_mcasp),
GFP_KERNEL);
if (!mcasp)
return -ENOMEM;
pdata = davinci_mcasp_set_pdata_from_of(pdev);
if (!pdata) {
dev_err(&pdev->dev, "no platform data\n");
return -EINVAL;
}
mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
if (!mem) {
dev_warn(mcasp->dev,
"\"mpu\" mem resource not found, using index 0\n");
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem) {
dev_err(&pdev->dev, "no mem resource?\n");
return -ENODEV;
}
}
mcasp->base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(mcasp->base))
return PTR_ERR(mcasp->base);
pm_runtime_enable(&pdev->dev);
mcasp->op_mode = pdata->op_mode;
/* sanity check for tdm slots parameter */
if (mcasp->op_mode == DAVINCI_MCASP_IIS_MODE) {
if (pdata->tdm_slots < 2) {
dev_err(&pdev->dev, "invalid tdm slots: %d\n",
pdata->tdm_slots);
mcasp->tdm_slots = 2;
} else if (pdata->tdm_slots > 32) {
dev_err(&pdev->dev, "invalid tdm slots: %d\n",
pdata->tdm_slots);
mcasp->tdm_slots = 32;
} else {
mcasp->tdm_slots = pdata->tdm_slots;
}
}
mcasp->num_serializer = pdata->num_serializer;
#ifdef CONFIG_PM_SLEEP
mcasp->context.xrsr_regs = devm_kzalloc(&pdev->dev,
sizeof(u32) * mcasp->num_serializer,
GFP_KERNEL);
#endif
mcasp->serial_dir = pdata->serial_dir;
mcasp->version = pdata->version;
mcasp->txnumevt = pdata->txnumevt;
mcasp->rxnumevt = pdata->rxnumevt;
mcasp->dev = &pdev->dev;
irq = platform_get_irq_byname(pdev, "common");
if (irq >= 0) {
irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_common",
dev_name(&pdev->dev));
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
davinci_mcasp_common_irq_handler,
IRQF_ONESHOT | IRQF_SHARED,
irq_name, mcasp);
if (ret) {
dev_err(&pdev->dev, "common IRQ request failed\n");
goto err;
}
mcasp->irq_request[SNDRV_PCM_STREAM_PLAYBACK] = XUNDRN;
mcasp->irq_request[SNDRV_PCM_STREAM_CAPTURE] = ROVRN;
}
irq = platform_get_irq_byname(pdev, "rx");
if (irq >= 0) {
irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_rx",
dev_name(&pdev->dev));
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
davinci_mcasp_rx_irq_handler,
IRQF_ONESHOT, irq_name, mcasp);
if (ret) {
dev_err(&pdev->dev, "RX IRQ request failed\n");
goto err;
}
mcasp->irq_request[SNDRV_PCM_STREAM_CAPTURE] = ROVRN;
}
irq = platform_get_irq_byname(pdev, "tx");
if (irq >= 0) {
irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s_tx",
dev_name(&pdev->dev));
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
davinci_mcasp_tx_irq_handler,
IRQF_ONESHOT, irq_name, mcasp);
if (ret) {
dev_err(&pdev->dev, "TX IRQ request failed\n");
goto err;
}
mcasp->irq_request[SNDRV_PCM_STREAM_PLAYBACK] = XUNDRN;
}
dat = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dat");
if (dat)
mcasp->dat_port = true;
dma_data = &mcasp->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
if (dat)
dma_data->addr = dat->start;
else
dma_data->addr = mem->start + davinci_mcasp_txdma_offset(pdata);
dma = &mcasp->dma_request[SNDRV_PCM_STREAM_PLAYBACK];
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (res)
*dma = res->start;
else
*dma = pdata->tx_dma_channel;
/* dmaengine filter data for DT and non-DT boot */
if (pdev->dev.of_node)
dma_data->filter_data = "tx";
else
dma_data->filter_data = dma;
/* RX is not valid in DIT mode */
if (mcasp->op_mode != DAVINCI_MCASP_DIT_MODE) {
dma_data = &mcasp->dma_data[SNDRV_PCM_STREAM_CAPTURE];
if (dat)
dma_data->addr = dat->start;
else
dma_data->addr =
mem->start + davinci_mcasp_rxdma_offset(pdata);
dma = &mcasp->dma_request[SNDRV_PCM_STREAM_CAPTURE];
res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
if (res)
*dma = res->start;
else
*dma = pdata->rx_dma_channel;
/* dmaengine filter data for DT and non-DT boot */
if (pdev->dev.of_node)
dma_data->filter_data = "rx";
else
dma_data->filter_data = dma;
}
if (mcasp->version < MCASP_VERSION_3) {
mcasp->fifo_base = DAVINCI_MCASP_V2_AFIFO_BASE;
/* dma_params->dma_addr is pointing to the data port address */
mcasp->dat_port = true;
} else {
mcasp->fifo_base = DAVINCI_MCASP_V3_AFIFO_BASE;
}
/* Allocate memory for long enough list for all possible
* scenarios. Maximum number tdm slots is 32 and there cannot
* be more serializers than given in the configuration. The
* serializer directions could be taken into account, but it
* would make code much more complex and save only couple of
* bytes.
*/
mcasp->chconstr[SNDRV_PCM_STREAM_PLAYBACK].list =
devm_kzalloc(mcasp->dev, sizeof(unsigned int) *
(32 + mcasp->num_serializer - 2),
GFP_KERNEL);
mcasp->chconstr[SNDRV_PCM_STREAM_CAPTURE].list =
devm_kzalloc(mcasp->dev, sizeof(unsigned int) *
(32 + mcasp->num_serializer - 2),
GFP_KERNEL);
if (!mcasp->chconstr[SNDRV_PCM_STREAM_PLAYBACK].list ||
!mcasp->chconstr[SNDRV_PCM_STREAM_CAPTURE].list)
return -ENOMEM;
ret = davinci_mcasp_set_ch_constraints(mcasp);
if (ret)
goto err;
dev_set_drvdata(&pdev->dev, mcasp);
mcasp_reparent_fck(pdev);
ret = devm_snd_soc_register_component(&pdev->dev,
&davinci_mcasp_component,
&davinci_mcasp_dai[pdata->op_mode], 1);
if (ret != 0)
goto err;
ret = davinci_mcasp_get_dma_type(mcasp);
switch (ret) {
case PCM_EDMA:
#if IS_BUILTIN(CONFIG_SND_EDMA_SOC) || \
(IS_MODULE(CONFIG_SND_DAVINCI_SOC_MCASP) && \
IS_MODULE(CONFIG_SND_EDMA_SOC))
ret = edma_pcm_platform_register(&pdev->dev);
#else
dev_err(&pdev->dev, "Missing SND_EDMA_SOC\n");
ret = -EINVAL;
goto err;
#endif
break;
case PCM_SDMA:
#if IS_BUILTIN(CONFIG_SND_OMAP_SOC) || \
(IS_MODULE(CONFIG_SND_DAVINCI_SOC_MCASP) && \
IS_MODULE(CONFIG_SND_OMAP_SOC))
ret = omap_pcm_platform_register(&pdev->dev);
#else
dev_err(&pdev->dev, "Missing SND_SDMA_SOC\n");
ret = -EINVAL;
goto err;
#endif
break;
default:
dev_err(&pdev->dev, "No DMA controller found (%d)\n", ret);
case -EPROBE_DEFER:
goto err;
break;
}
if (ret) {
dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
goto err;
}
return 0;
err:
pm_runtime_disable(&pdev->dev);
return ret;
}
static int davinci_mcasp_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
return 0;
}
static struct platform_driver davinci_mcasp_driver = {
.probe = davinci_mcasp_probe,
.remove = davinci_mcasp_remove,
.driver = {
.name = "davinci-mcasp",
.of_match_table = mcasp_dt_ids,
},
};
module_platform_driver(davinci_mcasp_driver);
MODULE_AUTHOR("Steve Chen");
MODULE_DESCRIPTION("TI DAVINCI McASP SoC Interface");
MODULE_LICENSE("GPL");
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