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linux/sound/soc/omap/omap-mcbsp.c
Misael Lopez Cruz ef390c0b6e ASoC: OMAP: Initialize XCCR and RCCR registers in McBSP DAI driver 
This patch explicitly initializes McBSP Transmit Configuration
Control Register (XCCR) and Receive Configuration Control
Register (RCCR) to their reset values. Reset values are 26 ns
of DX delay and Transmit DMA disabled for XCCR register;
receive full cycle mode enabled and Receive DMA disabled for
RCCR register.

This patch requires a counterpart in OMAP McBSP driver before
to apply it. The required changes in McBSP were sent and approved
in linux-omap mailing list and patch is going upstream
(commit 3127f8f859 from linux-omap-2.6
tree).

Signed-off-by: Misael Lopez Cruz <x0052729@ti.com>
[ jarkko.nikula@nokia.com: Commit id for counterpart patch corrected ]
Signed-off-by: Jarkko Nikula <jarkko.nikula@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2009-01-29 13:17:45 +00:00

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/*
* omap-mcbsp.c -- OMAP ALSA SoC DAI driver using McBSP port
*
* Copyright (C) 2008 Nokia Corporation
*
* Contact: Jarkko Nikula <jarkko.nikula@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <mach/control.h>
#include <mach/dma.h>
#include <mach/mcbsp.h>
#include "omap-mcbsp.h"
#include "omap-pcm.h"
#define OMAP_MCBSP_RATES (SNDRV_PCM_RATE_8000_96000)
struct omap_mcbsp_data {
unsigned int bus_id;
struct omap_mcbsp_reg_cfg regs;
unsigned int fmt;
/*
* Flags indicating is the bus already activated and configured by
* another substream
*/
int active;
int configured;
};
#define to_mcbsp(priv) container_of((priv), struct omap_mcbsp_data, bus_id)
static struct omap_mcbsp_data mcbsp_data[NUM_LINKS];
/*
* Stream DMA parameters. DMA request line and port address are set runtime
* since they are different between OMAP1 and later OMAPs
*/
static struct omap_pcm_dma_data omap_mcbsp_dai_dma_params[NUM_LINKS][2];
#if defined(CONFIG_ARCH_OMAP15XX) || defined(CONFIG_ARCH_OMAP16XX)
static const int omap1_dma_reqs[][2] = {
{ OMAP_DMA_MCBSP1_TX, OMAP_DMA_MCBSP1_RX },
{ OMAP_DMA_MCBSP2_TX, OMAP_DMA_MCBSP2_RX },
{ OMAP_DMA_MCBSP3_TX, OMAP_DMA_MCBSP3_RX },
};
static const unsigned long omap1_mcbsp_port[][2] = {
{ OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
OMAP1510_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
{ OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
OMAP1510_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
{ OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DXR1,
OMAP1510_MCBSP3_BASE + OMAP_MCBSP_REG_DRR1 },
};
#else
static const int omap1_dma_reqs[][2] = {};
static const unsigned long omap1_mcbsp_port[][2] = {};
#endif
#if defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX)
static const int omap24xx_dma_reqs[][2] = {
{ OMAP24XX_DMA_MCBSP1_TX, OMAP24XX_DMA_MCBSP1_RX },
{ OMAP24XX_DMA_MCBSP2_TX, OMAP24XX_DMA_MCBSP2_RX },
#if defined(CONFIG_ARCH_OMAP2430) || defined(CONFIG_ARCH_OMAP34XX)
{ OMAP24XX_DMA_MCBSP3_TX, OMAP24XX_DMA_MCBSP3_RX },
{ OMAP24XX_DMA_MCBSP4_TX, OMAP24XX_DMA_MCBSP4_RX },
{ OMAP24XX_DMA_MCBSP5_TX, OMAP24XX_DMA_MCBSP5_RX },
#endif
};
#else
static const int omap24xx_dma_reqs[][2] = {};
#endif
#if defined(CONFIG_ARCH_OMAP2420)
static const unsigned long omap2420_mcbsp_port[][2] = {
{ OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR1,
OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR1 },
{ OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR1,
OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR1 },
};
#else
static const unsigned long omap2420_mcbsp_port[][2] = {};
#endif
#if defined(CONFIG_ARCH_OMAP2430)
static const unsigned long omap2430_mcbsp_port[][2] = {
{ OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
OMAP24XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
{ OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
OMAP24XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
{ OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
OMAP2430_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
{ OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
OMAP2430_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
{ OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
OMAP2430_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
};
#else
static const unsigned long omap2430_mcbsp_port[][2] = {};
#endif
#if defined(CONFIG_ARCH_OMAP34XX)
static const unsigned long omap34xx_mcbsp_port[][2] = {
{ OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DXR,
OMAP34XX_MCBSP1_BASE + OMAP_MCBSP_REG_DRR },
{ OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DXR,
OMAP34XX_MCBSP2_BASE + OMAP_MCBSP_REG_DRR },
{ OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DXR,
OMAP34XX_MCBSP3_BASE + OMAP_MCBSP_REG_DRR },
{ OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DXR,
OMAP34XX_MCBSP4_BASE + OMAP_MCBSP_REG_DRR },
{ OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DXR,
OMAP34XX_MCBSP5_BASE + OMAP_MCBSP_REG_DRR },
};
#else
static const unsigned long omap34xx_mcbsp_port[][2] = {};
#endif
static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
int err = 0;
if (!cpu_dai->active)
err = omap_mcbsp_request(mcbsp_data->bus_id);
return err;
}
static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
if (!cpu_dai->active) {
omap_mcbsp_free(mcbsp_data->bus_id);
mcbsp_data->configured = 0;
}
}
static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
int err = 0;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_RESUME:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
if (!mcbsp_data->active++)
omap_mcbsp_start(mcbsp_data->bus_id);
break;
case SNDRV_PCM_TRIGGER_STOP:
case SNDRV_PCM_TRIGGER_SUSPEND:
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
if (!--mcbsp_data->active)
omap_mcbsp_stop(mcbsp_data->bus_id);
break;
default:
err = -EINVAL;
}
return err;
}
static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params,
struct snd_soc_dai *dai)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
int dma, bus_id = mcbsp_data->bus_id, id = cpu_dai->id;
int wlen, channels;
unsigned long port;
if (cpu_class_is_omap1()) {
dma = omap1_dma_reqs[bus_id][substream->stream];
port = omap1_mcbsp_port[bus_id][substream->stream];
} else if (cpu_is_omap2420()) {
dma = omap24xx_dma_reqs[bus_id][substream->stream];
port = omap2420_mcbsp_port[bus_id][substream->stream];
} else if (cpu_is_omap2430()) {
dma = omap24xx_dma_reqs[bus_id][substream->stream];
port = omap2430_mcbsp_port[bus_id][substream->stream];
} else if (cpu_is_omap343x()) {
dma = omap24xx_dma_reqs[bus_id][substream->stream];
port = omap34xx_mcbsp_port[bus_id][substream->stream];
} else {
return -ENODEV;
}
omap_mcbsp_dai_dma_params[id][substream->stream].name =
substream->stream ? "Audio Capture" : "Audio Playback";
omap_mcbsp_dai_dma_params[id][substream->stream].dma_req = dma;
omap_mcbsp_dai_dma_params[id][substream->stream].port_addr = port;
cpu_dai->dma_data = &omap_mcbsp_dai_dma_params[id][substream->stream];
if (mcbsp_data->configured) {
/* McBSP already configured by another stream */
return 0;
}
channels = params_channels(params);
switch (channels) {
case 2:
/* Use dual-phase frames */
regs->rcr2 |= RPHASE;
regs->xcr2 |= XPHASE;
case 1:
/* Set 1 word per (McBSP) frame */
regs->rcr2 |= RFRLEN2(1 - 1);
regs->rcr1 |= RFRLEN1(1 - 1);
regs->xcr2 |= XFRLEN2(1 - 1);
regs->xcr1 |= XFRLEN1(1 - 1);
break;
default:
/* Unsupported number of channels */
return -EINVAL;
}
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
/* Set word lengths */
wlen = 16;
regs->rcr2 |= RWDLEN2(OMAP_MCBSP_WORD_16);
regs->rcr1 |= RWDLEN1(OMAP_MCBSP_WORD_16);
regs->xcr2 |= XWDLEN2(OMAP_MCBSP_WORD_16);
regs->xcr1 |= XWDLEN1(OMAP_MCBSP_WORD_16);
break;
default:
/* Unsupported PCM format */
return -EINVAL;
}
/* Set FS period and length in terms of bit clock periods */
switch (mcbsp_data->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
regs->srgr2 |= FPER(wlen * 2 - 1);
regs->srgr1 |= FWID(wlen - 1);
break;
case SND_SOC_DAIFMT_DSP_B:
regs->srgr2 |= FPER(wlen * channels - 1);
regs->srgr1 |= FWID(wlen * channels - 2);
break;
}
omap_mcbsp_config(bus_id, &mcbsp_data->regs);
mcbsp_data->configured = 1;
return 0;
}
/*
* This must be called before _set_clkdiv and _set_sysclk since McBSP register
* cache is initialized here
*/
static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai,
unsigned int fmt)
{
struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
if (mcbsp_data->configured)
return 0;
mcbsp_data->fmt = fmt;
memset(regs, 0, sizeof(*regs));
/* Generic McBSP register settings */
regs->spcr2 |= XINTM(3) | FREE;
regs->spcr1 |= RINTM(3);
regs->rcr2 |= RFIG;
regs->xcr2 |= XFIG;
if (cpu_is_omap2430() || cpu_is_omap34xx()) {
regs->xccr = DXENDLY(1) | XDMAEN;
regs->rccr = RFULL_CYCLE | RDMAEN;
}
switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
case SND_SOC_DAIFMT_I2S:
/* 1-bit data delay */
regs->rcr2 |= RDATDLY(1);
regs->xcr2 |= XDATDLY(1);
break;
case SND_SOC_DAIFMT_DSP_B:
/* 0-bit data delay */
regs->rcr2 |= RDATDLY(0);
regs->xcr2 |= XDATDLY(0);
break;
default:
/* Unsupported data format */
return -EINVAL;
}
switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
case SND_SOC_DAIFMT_CBS_CFS:
/* McBSP master. Set FS and bit clocks as outputs */
regs->pcr0 |= FSXM | FSRM |
CLKXM | CLKRM;
/* Sample rate generator drives the FS */
regs->srgr2 |= FSGM;
break;
case SND_SOC_DAIFMT_CBM_CFM:
/* McBSP slave */
break;
default:
/* Unsupported master/slave configuration */
return -EINVAL;
}
/* Set bit clock (CLKX/CLKR) and FS polarities */
switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
case SND_SOC_DAIFMT_NB_NF:
/*
* Normal BCLK + FS.
* FS active low. TX data driven on falling edge of bit clock
* and RX data sampled on rising edge of bit clock.
*/
regs->pcr0 |= FSXP | FSRP |
CLKXP | CLKRP;
break;
case SND_SOC_DAIFMT_NB_IF:
regs->pcr0 |= CLKXP | CLKRP;
break;
case SND_SOC_DAIFMT_IB_NF:
regs->pcr0 |= FSXP | FSRP;
break;
case SND_SOC_DAIFMT_IB_IF:
break;
default:
return -EINVAL;
}
return 0;
}
static int omap_mcbsp_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
int div_id, int div)
{
struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
if (div_id != OMAP_MCBSP_CLKGDV)
return -ENODEV;
regs->srgr1 |= CLKGDV(div - 1);
return 0;
}
static int omap_mcbsp_dai_set_clks_src(struct omap_mcbsp_data *mcbsp_data,
int clk_id)
{
int sel_bit;
u16 reg, reg_devconf1 = OMAP243X_CONTROL_DEVCONF1;
if (cpu_class_is_omap1()) {
/* OMAP1's can use only external source clock */
if (unlikely(clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK))
return -EINVAL;
else
return 0;
}
if (cpu_is_omap2420() && mcbsp_data->bus_id > 1)
return -EINVAL;
if (cpu_is_omap343x())
reg_devconf1 = OMAP343X_CONTROL_DEVCONF1;
switch (mcbsp_data->bus_id) {
case 0:
reg = OMAP2_CONTROL_DEVCONF0;
sel_bit = 2;
break;
case 1:
reg = OMAP2_CONTROL_DEVCONF0;
sel_bit = 6;
break;
case 2:
reg = reg_devconf1;
sel_bit = 0;
break;
case 3:
reg = reg_devconf1;
sel_bit = 2;
break;
case 4:
reg = reg_devconf1;
sel_bit = 4;
break;
default:
return -EINVAL;
}
if (clk_id == OMAP_MCBSP_SYSCLK_CLKS_FCLK)
omap_ctrl_writel(omap_ctrl_readl(reg) & ~(1 << sel_bit), reg);
else
omap_ctrl_writel(omap_ctrl_readl(reg) | (1 << sel_bit), reg);
return 0;
}
static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
int clk_id, unsigned int freq,
int dir)
{
struct omap_mcbsp_data *mcbsp_data = to_mcbsp(cpu_dai->private_data);
struct omap_mcbsp_reg_cfg *regs = &mcbsp_data->regs;
int err = 0;
switch (clk_id) {
case OMAP_MCBSP_SYSCLK_CLK:
regs->srgr2 |= CLKSM;
break;
case OMAP_MCBSP_SYSCLK_CLKS_FCLK:
case OMAP_MCBSP_SYSCLK_CLKS_EXT:
err = omap_mcbsp_dai_set_clks_src(mcbsp_data, clk_id);
break;
case OMAP_MCBSP_SYSCLK_CLKX_EXT:
regs->srgr2 |= CLKSM;
case OMAP_MCBSP_SYSCLK_CLKR_EXT:
regs->pcr0 |= SCLKME;
break;
default:
err = -ENODEV;
}
return err;
}
#define OMAP_MCBSP_DAI_BUILDER(link_id) \
{ \
.name = "omap-mcbsp-dai-"#link_id, \
.id = (link_id), \
.playback = { \
.channels_min = 1, \
.channels_max = 2, \
.rates = OMAP_MCBSP_RATES, \
.formats = SNDRV_PCM_FMTBIT_S16_LE, \
}, \
.capture = { \
.channels_min = 1, \
.channels_max = 2, \
.rates = OMAP_MCBSP_RATES, \
.formats = SNDRV_PCM_FMTBIT_S16_LE, \
}, \
.ops = { \
.startup = omap_mcbsp_dai_startup, \
.shutdown = omap_mcbsp_dai_shutdown, \
.trigger = omap_mcbsp_dai_trigger, \
.hw_params = omap_mcbsp_dai_hw_params, \
.set_fmt = omap_mcbsp_dai_set_dai_fmt, \
.set_clkdiv = omap_mcbsp_dai_set_clkdiv, \
.set_sysclk = omap_mcbsp_dai_set_dai_sysclk, \
}, \
.private_data = &mcbsp_data[(link_id)].bus_id, \
}
struct snd_soc_dai omap_mcbsp_dai[] = {
OMAP_MCBSP_DAI_BUILDER(0),
OMAP_MCBSP_DAI_BUILDER(1),
#if NUM_LINKS >= 3
OMAP_MCBSP_DAI_BUILDER(2),
#endif
#if NUM_LINKS == 5
OMAP_MCBSP_DAI_BUILDER(3),
OMAP_MCBSP_DAI_BUILDER(4),
#endif
};
EXPORT_SYMBOL_GPL(omap_mcbsp_dai);
static int __init snd_omap_mcbsp_init(void)
{
return snd_soc_register_dais(omap_mcbsp_dai,
ARRAY_SIZE(omap_mcbsp_dai));
}
module_init(snd_omap_mcbsp_init);
static void __exit snd_omap_mcbsp_exit(void)
{
snd_soc_unregister_dais(omap_mcbsp_dai, ARRAY_SIZE(omap_mcbsp_dai));
}
module_exit(snd_omap_mcbsp_exit);
MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@nokia.com>");
MODULE_DESCRIPTION("OMAP I2S SoC Interface");
MODULE_LICENSE("GPL");
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