I think I have my driver compiling and such with the kernel. I had an error in my last Kconfig and Makefile, which I hope I have fixed. It appears to be making correctly. I will attach the three files if anyone would like to view them. I am still working on getting linux2.6.22-rc1 booting correctly. Once I have that, I should be able to evaluate the driver a little better. I also believe I am going to need alsa-libs. I will try to locate those and get them cross-compiled asap. If anyone has pointers on my Kconfig, Makefile, or driver--or on how to get linux booting, please feel free to give them to me. Thanks. Paul
Attachment:
Kconfig
Description: Binary data
Attachment:
Makefile
Description: Binary data
/*
* grh_ek_w6811 -- SoC audio for AT91SAM9260-EK board
*
* ASoC Codec and Machine driver for W6811 PCM interface.
*
* Author: Paul Kavan, Project Engineer <pkavan@xxxxxxxxx>
* GRH Electronics, Inc.
* Created: Jun 15, 2007
*
*
* Borrowed heavily from:
*
* eti_b1_bluecore -- SoC audio for AT91RM9200-based Endrelia ETI_B1 board
* Frank Mandarino <fmandarino@xxxxxxxxxxxx>
* Endrelia Technologies, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <asm/arch/hardware.h>
#include <asm/arch/at91_pio.h>
#include <asm/arch/gpio.h>
#include "at91-pcm.h"
#include "at91-ssc.h"
#if 0
#define DBG(x...) printk(KERN_INFO "grh_ek_w6811: " x)
#else
#define DBG(x...)
#endif
/*
* W6811 PCM interface codec driver.
*/
#define W6811_VERSION "0.1"
#define W6811_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_LE) //TODO: Check on S16_LE
static struct snd_soc_codec_dai w6811_dai = {
.name = "W6811",
.playback = {
.stream_name = "Playback",
.channels_min = 1,
.channels_max = 1,
.rates = SNDRV_PCM_RATE_8000,
.formats = W6811_FORMATS,},
.capture = {
.stream_name = "Capture",
.channels_min = 1,
.channels_max = 1,
.rates = SNDRV_PCM_RATE_8000,
.formats = W6811_FORMATS,},
};
static int w6811_soc_probe(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec;
int ret = 0;
printk(KERN_INFO "w6811: W6811 PCM SoC Audio %s\n", W6811_VERSION);
socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
if (socdev->codec == NULL)
return -ENOMEM;
codec = socdev->codec;
mutex_init(&codec->mutex);
codec->name = "W6811";
codec->owner = THIS_MODULE;
codec->dai = &w6811_dai;
codec->num_dai = 1;
INIT_LIST_HEAD(&codec->dapm_widgets);
INIT_LIST_HEAD(&codec->dapm_paths);
/* register pcms */
ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
if(ret < 0)
goto err;
ret = snd_soc_register_card(socdev);
if (ret < 0)
goto bus_err;
return 0;
bus_err:
snd_soc_free_pcms(socdev);
err:
kfree(socdev->codec);
socdev->codec = NULL;
return ret;
}
static int w6811_soc_remove(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_codec *codec = socdev->codec;
if(codec == NULL)
return 0;
snd_soc_free_pcms(socdev);
kfree(socdev->codec);
return 0;
}
static struct snd_soc_codec_device soc_codec_dev_w6811 = {
.probe = w6811_soc_probe,
.remove = w6811_soc_remove,
};
/*
* GRH EK W6811 Machine driver.
*/
#define AT91_PIO_TK0 (1 << (AT91_PIN_PB16 - PIN_BASE) % 32)
#define AT91_PIO_TF0 (1 << (AT91_PIN_PB17 - PIN_BASE) % 32)
#define AT91_PIO_TD0 (1 << (AT91_PIN_PB18 - PIN_BASE) % 32)
#define AT91_PIO_RD0 (1 << (AT91_PIN_PB19 - PIN_BASE) % 32)
#define AT91_PIO_RK0 (1 << (AT91_PIN_PB20 - PIN_BASE) % 32)
#define AT91_PIO_RF0 (1 << (AT91_PIN_PB21 - PIN_BASE) % 32)
/*
* GRH EK W6811 PCM interface machine driver operations.
*
* Only hw_params() is required, and only the CPU_DAI needs to be
* initiailzed, as there is no real CODEC DAI.
*
* ??The CODEC DAI is controlled by BlueZ BCCMD and SCO operations.
*/
static int grh_ek_w6811_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
struct snd_soc_cpu_dai *cpu_dai = rtd->dai->cpu_dai;
int ret;
int cmr_div, period;
/* set cpu DAI configuration */
ret = cpu_dai->dai_ops.set_fmt(cpu_dai, SND_SOC_DAIFMT_DSP_A |
SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
if (ret < 0)
return ret;
/*
* The W6811 PCM interface sync operates at 8kHz, and
* the PCM_CLK signal must be greater than 256kHz.
*/
cmr_div = 187; /* PCM_CLK = ~96MHz/(2*187) = 256kHz */
period = 15; /* PCM_SYNC = PCM_CLK/(2*(15+1)) = 8000Hz */
/* set the MCK divider for PCM_CLK */
ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, AT91SSC_CMR_DIV, cmr_div);
if (ret < 0)
return ret;
/* set the BCLK divider for DACLRC */
ret = cpu_dai->dai_ops.set_clkdiv(cpu_dai, AT91SSC_TCMR_PERIOD, period);
if (ret < 0)
return ret;
return 0;
}
static struct snd_soc_ops grh_ek_w6811_ops = {
.hw_params = grh_ek_w6811_hw_params,
};
static struct snd_soc_dai_link grh_ek_w6811_dai = {
.name = "W6811 PCM",
.stream_name = "W6811",
.cpu_dai = &at91_ssc_dai[2], //TODO: Determine what the 2 is indexing
.codec_dai = &w6811_dai,
.ops = &grh_ek_w6811_ops,
};
static struct snd_soc_machine snd_soc_machine_grh_ek_w6811 = {
.name = "GRH_EK_W6811",
.dai_link = &grh_ek_w6811_dai,
.num_links = 1,
};
static struct snd_soc_device grh_ek_w6811_snd_devdata = {
.machine = &snd_soc_machine_grh_ek_w6811,
.platform = &at91_soc_platform,
.codec_dev = &soc_codec_dev_w6811,
};
static struct platform_device *grh_ek_w6811_snd_device;
static int __init grh_ek_w6811_init(void)
{
int ret;
u32 ssc_pio_lines;
struct at91_ssc_periph *ssc = grh_ek_w6811_dai.cpu_dai->private_data;
if (!request_mem_region(AT91SAM9260_BASE_SSC, SZ_16K, "soc-audio")) {
DBG("SSC memory region is busy\n");
return -EBUSY;
}
ssc->base = ioremap(AT91SAM9260_BASE_SSC, SZ_16K);
if (!ssc->base) {
DBG("SSC memory ioremap failed\n");
ret = -ENOMEM;
goto fail_release_mem;
}
ssc->pid = AT91SAM9260_ID_SSC;
grh_ek_w6811_snd_device = platform_device_alloc("soc-audio", 2); //TODO: Determine why the 2
if (!grh_ek_w6811_snd_device) {
DBG("platform device allocation failed\n");
ret = -ENOMEM;
goto fail_io_unmap;
}
platform_set_drvdata(grh_ek_w6811_snd_device, &grh_ek_w6811_snd_devdata);
grh_ek_w6811_snd_devdata.dev = &grh_ek_w6811_snd_device->dev;
ret = platform_device_add(grh_ek_w6811_snd_device);
if (ret) {
DBG("platform device add failed\n");
platform_device_put(grh_ek_w6811_snd_device);
goto fail_io_unmap;
}
//TODO: Ask Frank to make sure what is happening is what I think is happening
ssc_pio_lines = AT91_PIO_TF0 | AT91_PIO_TK0 | AT91_PIO_TD0
| AT91_PIO_RD0 /* | AT91_PIO_RK0 | AT91_PIO_RF0 */;
//TODO: Check on this.
/* Reset all PIO registers and assign lines to peripheral A */
at91_sys_write(AT91_PIOB + PIO_PDR, ssc_pio_lines);
at91_sys_write(AT91_PIOB + PIO_ODR, ssc_pio_lines);
at91_sys_write(AT91_PIOB + PIO_IFDR, ssc_pio_lines);
at91_sys_write(AT91_PIOB + PIO_CODR, ssc_pio_lines);
at91_sys_write(AT91_PIOB + PIO_IDR, ssc_pio_lines);
at91_sys_write(AT91_PIOB + PIO_MDDR, ssc_pio_lines);
at91_sys_write(AT91_PIOB + PIO_PUDR, ssc_pio_lines);
at91_sys_write(AT91_PIOB + PIO_ASR, ssc_pio_lines);
at91_sys_write(AT91_PIOB + PIO_OWDR, ssc_pio_lines);
printk(KERN_INFO "grh_ek_w6811: W6811 PCM in Slave Mode\n");
return ret;
fail_io_unmap:
iounmap(ssc->base);
fail_release_mem:
release_mem_region(AT91SAM9260_BASE_SSC, SZ_16K);
return ret;
}
static void __exit grh_ek_w6811_exit(void)
{
struct at91_ssc_periph *ssc = grh_ek_w6811_dai.cpu_dai->private_data;
platform_device_unregister(grh_ek_w6811_snd_device);
iounmap(ssc->base);
release_mem_region(AT91SAM9260_BASE_SSC, SZ_16K);
}
module_init(grh_ek_w6811_init);
module_exit(grh_ek_w6811_exit);
/* Module information */
MODULE_AUTHOR("Paul Kavan <pkavan@xxxxxxxxx>");
MODULE_DESCRIPTION("ALSA SoC GRH-EK-W6811");
MODULE_LICENSE("GPL");
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