Re: [alsa-devel] [PATCH 1/3] ASoC: Add a new imx-ssi sound driver

On Wed, Nov 25, 2009 at 04:41:04PM +0100, Sascha Hauer wrote:

The old driver has the number of SSI units in the system hardcoded, does not make use of the device model and works only on i.MX21/27.

This driver replaces it. It works in DMA mode on i.MX21/27 and using an FIQ handler on other systems. It also supports AC97 mode of the SSI units.

Signed-off-by: Sascha Hauer s.hauer@pengutronix.de

This'll take a little more time to read through, and it'd be good to get input from Javier and Timur too (as well as Liam's review, I've CCed them all in).

If you could get the arch/arm bits in during the merge window that'd be ideal; it'd mean that even if this slips past it we'll have working i.MX3x support on the ASoC branch for .33.

---

arch/arm/plat-mxc/Makefile | 4 + arch/arm/plat-mxc/include/mach/ssi.h | 17 + arch/arm/plat-mxc/ssi-fiq-ksym.c | 20 + arch/arm/plat-mxc/ssi-fiq.S | 134 ++++++ sound/soc/imx/Kconfig | 20 +- sound/soc/imx/Makefile | 12 +- sound/soc/imx/imx-pcm-dma-mx2.c | 313 ++++++++++++++ sound/soc/imx/imx-pcm-fiq.c | 277 ++++++++++++ sound/soc/imx/imx-ssi.c | 762 ++++++++++++++++++++++++++++++++++ sound/soc/imx/imx-ssi.h | 238 +++++++++++ 10 files changed, 1777 insertions(+), 20 deletions(-) create mode 100644 arch/arm/plat-mxc/include/mach/ssi.h create mode 100644 arch/arm/plat-mxc/ssi-fiq-ksym.c create mode 100644 arch/arm/plat-mxc/ssi-fiq.S create mode 100644 sound/soc/imx/imx-pcm-dma-mx2.c create mode 100644 sound/soc/imx/imx-pcm-fiq.c create mode 100644 sound/soc/imx/imx-ssi.c create mode 100644 sound/soc/imx/imx-ssi.h

diff --git a/arch/arm/plat-mxc/Makefile b/arch/arm/plat-mxc/Makefile index e3212c8..8852ca1 100644 --- a/arch/arm/plat-mxc/Makefile +++ b/arch/arm/plat-mxc/Makefile @@ -9,3 +9,7 @@ obj-$(CONFIG_ARCH_MX1) += iomux-mx1-mx2.o dma-mx1-mx2.o obj-$(CONFIG_ARCH_MX2) += iomux-mx1-mx2.o dma-mx1-mx2.o obj-$(CONFIG_ARCH_MXC_IOMUX_V3) += iomux-v3.o obj-$(CONFIG_MXC_PWM) += pwm.o +ifdef CONFIG_SND_IMX_SOC +obj-y += ssi-fiq.o +obj-y += ssi-fiq-ksym.o +endif diff --git a/arch/arm/plat-mxc/include/mach/ssi.h b/arch/arm/plat-mxc/include/mach/ssi.h new file mode 100644 index 0000000..144a2ac --- /dev/null +++ b/arch/arm/plat-mxc/include/mach/ssi.h @@ -0,0 +1,17 @@ +#ifndef __MACH_SSI_H +#define __MACH_SSI_H

+struct snd_ac97;

+extern unsigned char imx_ssi_fiq_start, imx_ssi_fiq_end; +extern unsigned long imx_ssi_fiq_base, imx_ssi_fiq_tx_buffer, imx_ssi_fiq_rx_buffer;

+struct imx_ssi_platform_data {

• unsigned int flags;

+#define IMX_SSI_DMA (1 << 0) +#define IMX_SSI_USE_AC97 (1 << 1)

• void (*ac97_reset) (struct snd_ac97 *ac97);
• void (*ac97_warm_reset)(struct snd_ac97 *ac97);

+};

+#endif /* __MACH_SSI_H */ diff --git a/arch/arm/plat-mxc/ssi-fiq-ksym.c b/arch/arm/plat-mxc/ssi-fiq-ksym.c new file mode 100644 index 0000000..b5fad45 --- /dev/null +++ b/arch/arm/plat-mxc/ssi-fiq-ksym.c @@ -0,0 +1,20 @@ +/*

• • Exported ksyms for the SSI FIQ handler
• • Copyright (C) 2009, Sascha Hauer s.hauer@pengutronix.de
• • 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/module.h>

+#include <mach/ssi.h>

+EXPORT_SYMBOL(imx_ssi_fiq_tx_buffer); +EXPORT_SYMBOL(imx_ssi_fiq_rx_buffer); +EXPORT_SYMBOL(imx_ssi_fiq_start); +EXPORT_SYMBOL(imx_ssi_fiq_end); +EXPORT_SYMBOL(imx_ssi_fiq_base);

diff --git a/arch/arm/plat-mxc/ssi-fiq.S b/arch/arm/plat-mxc/ssi-fiq.S new file mode 100644 index 0000000..4ddce56 --- /dev/null +++ b/arch/arm/plat-mxc/ssi-fiq.S @@ -0,0 +1,134 @@ +/*

• • Copyright (C) 2009 Sascha Hauer s.hauer@pengutronix.de
• • 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/linkage.h> +#include <asm/assembler.h>

+/*

• • r8 = bit 0-15: tx offset, bit 16-31: tx buffer size
• • r9 = bit 0-15: rx offset, bit 16-31: rx buffer size
• */

+#define SSI_STX0 0x00 +#define SSI_SRX0 0x08 +#define SSI_SISR 0x14 +#define SSI_SIER 0x18 +#define SSI_SACNT 0x38

+#define SSI_SACNT_AC97EN (1 << 0)

+#define SSI_SIER_TFE0_EN (1 << 0) +#define SSI_SISR_TFE0 (1 << 0) +#define SSI_SISR_RFF0 (1 << 2) +#define SSI_SIER_RFF0_EN (1 << 2)

• .text
  

• .global	imx_ssi_fiq_start
  

• .global	imx_ssi_fiq_end
  

• .global imx_ssi_fiq_base
  

• .global imx_ssi_fiq_rx_buffer
  

• .global imx_ssi_fiq_tx_buffer
  

+imx_ssi_fiq_start:

• ldr r12, imx_ssi_fiq_base
  

• /* TX */
  

• ldr r11, imx_ssi_fiq_tx_buffer
  

• /* shall we send? */
  

• ldr r13, [r12, #SSI_SIER]
  

• tst r13, #SSI_SIER_TFE0_EN
  

• beq 1f
  

• /* TX FIFO empty? */
  

• ldr r13, [r12, #SSI_SISR]
  

• tst r13, #SSI_SISR_TFE0
  

• beq 1f
  

• mov r10, #0x10000
  

• sub r10, #1
  

• and r10, r10, r8	/* r10: current buffer offset */
  

• add r11, r11, r10
  

• ldrh r13, [r11]
  

• strh r13, [r12, #SSI_STX0]
  

• ldrh r13, [r11, #2]
  

• strh r13, [r12, #SSI_STX0]
  

• ldrh r13, [r11, #4]
  

• strh r13, [r12, #SSI_STX0]
  

• ldrh r13, [r11, #6]
  

• strh r13, [r12, #SSI_STX0]
  

• add r10, #8
  

• lsr r13, r8, #16	/* r13: buffer size */
  

• cmp r10, r13
  

• lslgt r8, r13, #16
  

• addle r8, #8
  

+1:

• /* RX */
  

• /* shall we receive? */
  

• ldr r13, [r12, #SSI_SIER]
  

• tst r13, #SSI_SIER_RFF0_EN
  

• beq 1f
  

• /* RX FIFO full? */
  

• ldr r13, [r12, #SSI_SISR]
  

• tst r13, #SSI_SISR_RFF0
  

• beq 1f
  

• ldr r11, imx_ssi_fiq_rx_buffer
  

• mov r10, #0x10000
  

• sub r10, #1
  

• and r10, r10, r9	/* r10: current buffer offset */
  

• add r11, r11, r10
  

• ldr r13, [r12, #SSI_SACNT]
  

• tst r13, #SSI_SACNT_AC97EN
  

• ldr r13, [r12, #SSI_SRX0]
  

• strh r13, [r11]
  

• ldr r13, [r12, #SSI_SRX0]
  

• strh r13, [r11, #2]
  

• /* dummy read to skip slot 12 */
  

• ldrne r13, [r12, #SSI_SRX0]
  

• ldr r13, [r12, #SSI_SRX0]
  

• strh r13, [r11, #4]
  

• ldr r13, [r12, #SSI_SRX0]
  

• strh r13, [r11, #6]
  

• /* dummy read to skip slot 12 */
  

• ldrne r13, [r12, #SSI_SRX0]
  

• add r10, #8
  

• lsr r13, r9, #16	/* r13: buffer size */
  

• cmp r10, r13
  

• lslgt r9, r13, #16
  

• addle r9, #8
  

+1:

• @ return from FIQ
  

• subs	pc, lr, #4
  

+imx_ssi_fiq_base:

• .word 0x0
  

+imx_ssi_fiq_rx_buffer:

• .word 0x0
  

+imx_ssi_fiq_tx_buffer:

• .word 0x0
  

+imx_ssi_fiq_end:

diff --git a/sound/soc/imx/Kconfig b/sound/soc/imx/Kconfig index a700562..84a25e6 100644 --- a/sound/soc/imx/Kconfig +++ b/sound/soc/imx/Kconfig @@ -1,21 +1,13 @@ -config SND_MX1_MX2_SOC

• tristate "SoC Audio for Freecale i.MX1x i.MX2x CPUs"
• depends on ARCH_MX2 || ARCH_MX1

+config SND_IMX_SOC

• tristate "SoC Audio for Freecale i.MX CPUs"
• depends on ARCH_MXC select SND_PCM
• select FIQ
• select SND_SOC_AC97_BUS help Say Y or M if you want to add support for codecs attached to

•  the MX1 or MX2 SSI interface.
  

•  the i.MX SSI interface.
  
  

config SND_MXC_SOC_SSI tristate

-config SND_SOC_MX27VIS_WM8974

• tristate "SoC Audio support for MX27 - WM8974 Visstrim_sm10 board"
• depends on SND_MX1_MX2_SOC && MACH_MX27 && MACH_IMX27_VISSTRIM_M10
• select SND_MXC_SOC_SSI
• select SND_SOC_WM8974
• help

•  Say Y if you want to add support for SoC audio on Visstrim SM10
  

•  board with WM8974.
  

diff --git a/sound/soc/imx/Makefile b/sound/soc/imx/Makefile index c2ffd2c..4bde34a 100644 --- a/sound/soc/imx/Makefile +++ b/sound/soc/imx/Makefile @@ -1,10 +1,10 @@ # i.MX Platform Support -snd-soc-mx1_mx2-objs := mx1_mx2-pcm.o -snd-soc-mxc-ssi-objs := mxc-ssi.o +snd-soc-imx-objs := imx-ssi.o imx-pcm-fiq.o imx-pcm-dma-mx2.o

-obj-$(CONFIG_SND_MX1_MX2_SOC) += snd-soc-mx1_mx2.o -obj-$(CONFIG_SND_MXC_SOC_SSI) += snd-soc-mxc-ssi.o +ifdef CONFIG_MACH_MX27 +snd-soc-imx-objs += imx-pcm-dma-mx2.o +endif

+obj-$(CONFIG_SND_IMX_SOC) += snd-soc-imx.o

# i.MX Machine Support -snd-soc-mx27vis-wm8974-objs := mx27vis_wm8974.o -obj-$(CONFIG_SND_SOC_MX27VIS_WM8974) += snd-soc-mx27vis-wm8974.o diff --git a/sound/soc/imx/imx-pcm-dma-mx2.c b/sound/soc/imx/imx-pcm-dma-mx2.c new file mode 100644 index 0000000..19452e4 --- /dev/null +++ b/sound/soc/imx/imx-pcm-dma-mx2.c @@ -0,0 +1,313 @@ +/*

• • imx-pcm-dma-mx2.c -- ALSA Soc Audio Layer
• • Copyright 2009 Sascha Hauer s.hauer@pengutronix.de
• • This code is based on code copyrighted by Freescale,
• • Liam Girdwood, Javier Martin and probably others.
• • 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/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h>

+#include <sound/core.h> +#include <sound/initval.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h>

+#include <mach/dma-mx1-mx2.h>

+#include "imx-ssi.h"

+struct imx_pcm_runtime_data {

• int sg_count;
• struct scatterlist *sg_list;
• int period;
• int periods;
• unsigned long dma_addr;
• int dma;
• struct snd_pcm_substream *substream;
• unsigned long offset;
• unsigned long size;
• unsigned long period_cnt;
• void *buf;
• int period_time;

+};

+/* Called by the DMA framework when a period has elapsed */ +static void imx_ssi_dma_progression(int channel, void *data,

• 			struct scatterlist *sg)
  

+{

• struct snd_pcm_substream *substream = data;
• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• if (!sg)

• return;
  

• runtime = iprtd->substream->runtime;
• iprtd->offset = sg->dma_address - runtime->dma_addr;
• snd_pcm_period_elapsed(iprtd->substream);

+}

+static void imx_ssi_dma_callback(int channel, void *data) +{

• pr_err("%s shouldn't be called\n", __func__);

+}

+static void snd_imx_dma_err_callback(int channel, void *data, int err) +{

• pr_err("DMA error callback called\n");
• pr_err("DMA timeout on channel %d -%s%s%s%s\n",

•  channel,
  

•  err & IMX_DMA_ERR_BURST ?    " burst" : "",
  

•  err & IMX_DMA_ERR_REQUEST ?  " request" : "",
  

•  err & IMX_DMA_ERR_TRANSFER ? " transfer" : "",
  

•  err & IMX_DMA_ERR_BUFFER ?   " buffer" : "");
  

+}

+static int imx_ssi_dma_alloc(struct snd_pcm_substream *substream) +{

• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct imx_pcm_dma_params *dma_params = rtd->dai->cpu_dai->dma_data;
• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• int ret;
• iprtd->dma = imx_dma_request_by_prio(DRV_NAME, DMA_PRIO_HIGH);
• if (iprtd->dma < 0) {

• pr_err("Failed to claim the audio DMA\n");
  

• return -ENODEV;
  

• }
• ret = imx_dma_setup_handlers(iprtd->dma,

• 		imx_ssi_dma_callback,
  

• 		snd_imx_dma_err_callback, substream);
  

• if (ret)

• goto out;
  

• ret = imx_dma_setup_progression_handler(iprtd->dma,

• 	imx_ssi_dma_progression);
  

• if (ret) {

• pr_err("Failed to setup the DMA handler\n");
  

• goto out;
  

• }
• ret = imx_dma_config_channel(iprtd->dma,

• 	IMX_DMA_MEMSIZE_16 | IMX_DMA_TYPE_FIFO,
  

• 	IMX_DMA_MEMSIZE_32 | IMX_DMA_TYPE_LINEAR,
  

• 	dma_params->dma, 1);
  

• if (ret < 0) {

• pr_err("Cannot configure DMA channel: %d\n", ret);
  

• goto out;
  

• }
• imx_dma_config_burstlen(iprtd->dma, dma_params->burstsize * 2);
• return 0;

+out:

• imx_dma_free(iprtd->dma);
• return ret;

+}

+static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,

• 		struct snd_pcm_hw_params *params)
  

+{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• int i;
• unsigned long dma_addr;
• imx_ssi_dma_alloc(substream);
• iprtd->size = params_buffer_bytes(params);
• iprtd->periods = params_periods(params);
• iprtd->period = params_period_bytes(params);
• iprtd->offset = 0;
• iprtd->period_time = HZ / (params_rate(params) /

• 	params_period_size(params));
  

• snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
• if (iprtd->sg_count != iprtd->periods) {

• kfree(iprtd->sg_list);
  

• iprtd->sg_list = kcalloc(iprtd->periods + 1,
  

• 		sizeof(struct scatterlist), GFP_KERNEL);
  

• if (!iprtd->sg_list)
  

• 	return -ENOMEM;
  

• iprtd->sg_count = iprtd->periods + 1;
  

• }
• sg_init_table(iprtd->sg_list, iprtd->sg_count);
• dma_addr = runtime->dma_addr;
• for (i = 0; i < iprtd->periods; i++) {

• iprtd->sg_list[i].page_link = 0;
  

• iprtd->sg_list[i].offset = 0;
  

• iprtd->sg_list[i].dma_address = dma_addr;
  

• iprtd->sg_list[i].length = iprtd->period;
  

• dma_addr += iprtd->period;
  

• }
• /* close the loop */
• iprtd->sg_list[iprtd->sg_count - 1].offset = 0;
• iprtd->sg_list[iprtd->sg_count - 1].length = 0;
• iprtd->sg_list[iprtd->sg_count - 1].page_link =

• 	((unsigned long) iprtd->sg_list | 0x01) & ~0x02;
  

• return 0;

+}

+static int snd_imx_pcm_hw_free(struct snd_pcm_substream *substream) +{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• if (iprtd->dma >= 0) {

• imx_dma_free(iprtd->dma);
  

• iprtd->dma = -EINVAL;
  

• }
• kfree(iprtd->sg_list);
• iprtd->sg_list = NULL;
• return 0;

+}

+static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) +{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct snd_soc_pcm_runtime *rtd = substream->private_data;
• struct imx_pcm_dma_params *dma_params = rtd->dai->cpu_dai->dma_data;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• int err;
• iprtd->substream = substream;
• iprtd->buf = (unsigned int *)substream->dma_buffer.area;
• iprtd->period_cnt = 0;
• pr_debug("%s: buf: %p period: %d periods: %d\n",

• 	__func__, iprtd->buf, iprtd->period, iprtd->periods);
  

• err = imx_dma_setup_sg(iprtd->dma, iprtd->sg_list, iprtd->sg_count,

• 	IMX_DMA_LENGTH_LOOP, dma_params->dma_addr,
  

• 	substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
  

• 	DMA_MODE_WRITE : DMA_MODE_READ);
  

• if (err)

• return err;
  

• return 0;

+}

+static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) +{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• switch (cmd) {
• case SNDRV_PCM_TRIGGER_START:
• case SNDRV_PCM_TRIGGER_RESUME:
• case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

• imx_dma_enable(iprtd->dma);
  

• break;
  

• case SNDRV_PCM_TRIGGER_STOP:
• case SNDRV_PCM_TRIGGER_SUSPEND:
• case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

• imx_dma_disable(iprtd->dma);
  

• break;
  

• default:

• return -EINVAL;
  

• }
• return 0;

+}

+static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) +{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• return bytes_to_frames(substream->runtime, iprtd->offset);

+}

+static struct snd_pcm_hardware snd_imx_hardware = {

• .info = SNDRV_PCM_INFO_INTERLEAVED |

• SNDRV_PCM_INFO_BLOCK_TRANSFER |
  

• SNDRV_PCM_INFO_MMAP |
  

• SNDRV_PCM_INFO_MMAP_VALID |
  

• SNDRV_PCM_INFO_PAUSE |
  

• SNDRV_PCM_INFO_RESUME,
  

• .formats = SNDRV_PCM_FMTBIT_S16_LE,
• .rate_min = 8000,
• .channels_min = 2,
• .channels_max = 2,
• .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
• .period_bytes_min = 128,
• .period_bytes_max = 16 * 1024,
• .periods_min = 2,
• .periods_max = 255,
• .fifo_size = 0,

+};

+static int snd_imx_open(struct snd_pcm_substream *substream) +{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd;
• int ret;
• iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
• runtime->private_data = iprtd;
• ret = snd_pcm_hw_constraint_integer(substream->runtime,

• 	SNDRV_PCM_HW_PARAM_PERIODS);
  

• if (ret < 0)

• return ret;
  

• snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
• return 0;

+}

+static struct snd_pcm_ops imx_pcm_ops = {

• .open = snd_imx_open,
• .ioctl = snd_pcm_lib_ioctl,
• .hw_params = snd_imx_pcm_hw_params,
• .hw_free = snd_imx_pcm_hw_free,
• .prepare = snd_imx_pcm_prepare,
• .trigger = snd_imx_pcm_trigger,
• .pointer = snd_imx_pcm_pointer,
• .mmap = snd_imx_pcm_mmap,

+};

+static struct snd_soc_platform imx_soc_platform_dma = {

• .name = "imx-audio",
• .pcm_ops = &imx_pcm_ops,
• .pcm_new = imx_pcm_new,
• .pcm_free = imx_pcm_free,

+};

+struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,

• struct imx_ssi *ssi)
  

+{

• ssi->dma_params_tx.burstsize = DMA_TXFIFO_BURST;
• ssi->dma_params_rx.burstsize = DMA_RXFIFO_BURST;
• return &imx_soc_platform_dma;

+}

diff --git a/sound/soc/imx/imx-pcm-fiq.c b/sound/soc/imx/imx-pcm-fiq.c new file mode 100644 index 0000000..5532579 --- /dev/null +++ b/sound/soc/imx/imx-pcm-fiq.c @@ -0,0 +1,277 @@ +/*

• • imx-pcm-fiq.c -- ALSA Soc Audio Layer
• • Copyright 2009 Sascha Hauer s.hauer@pengutronix.de
• • This code is based on code copyrighted by Freescale,
• • Liam Girdwood, Javier Martin and probably others.
• • 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/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h>

+#include <sound/core.h> +#include <sound/initval.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h>

+#include <asm/fiq.h>

+#include <mach/ssi.h>

+#include "imx-ssi.h"

+struct imx_pcm_runtime_data {

• int period;
• int periods;
• unsigned long dma_addr;
• int dma;
• unsigned long offset;
• unsigned long size;
• unsigned long period_cnt;
• void *buf;
• struct timer_list timer;
• int period_time;

+};

+static void imx_ssi_timer_callback(unsigned long data) +{

• struct snd_pcm_substream *substream = (void *)data;
• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• struct pt_regs regs;
• get_fiq_regs(&regs);
• if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)

• iprtd->offset = regs.ARM_r8 & 0xffff;
  

• else

• iprtd->offset = regs.ARM_r9 & 0xffff;
  

• iprtd->timer.expires = jiffies + iprtd->period_time;
• add_timer(&iprtd->timer);
• snd_pcm_period_elapsed(substream);

+}

+static struct fiq_handler fh = {

• .name = DRV_NAME,

+};

+static int snd_imx_pcm_hw_params(struct snd_pcm_substream *substream,

• 		struct snd_pcm_hw_params *params)
  

+{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• iprtd->size = params_buffer_bytes(params);
• iprtd->periods = params_periods(params);
• iprtd->period = params_period_bytes(params);
• iprtd->offset = 0;
• iprtd->period_time = HZ / (params_rate(params) / params_period_size(params));
• snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
• return 0;

+}

+static int snd_imx_pcm_prepare(struct snd_pcm_substream *substream) +{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• struct pt_regs regs;
• get_fiq_regs(&regs);
• if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)

• regs.ARM_r8 = (iprtd->period * iprtd->periods - 1) << 16;
  

• else

• regs.ARM_r9 = (iprtd->period * iprtd->periods - 1) << 16;
  

• set_fiq_regs(&regs);
• return 0;

+}

+static int fiq_enable; +static int imx_pcm_fiq;

+static int snd_imx_pcm_trigger(struct snd_pcm_substream *substream, int cmd) +{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• switch (cmd) {
• case SNDRV_PCM_TRIGGER_START:
• case SNDRV_PCM_TRIGGER_RESUME:
• case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

• iprtd->timer.expires = jiffies + iprtd->period_time;
  

• add_timer(&iprtd->timer);
  

• if (++fiq_enable == 1)
  

• 	enable_fiq(imx_pcm_fiq);
  

• break;
  

• case SNDRV_PCM_TRIGGER_STOP:
• case SNDRV_PCM_TRIGGER_SUSPEND:
• case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

• del_timer(&iprtd->timer);
  

• if (--fiq_enable == 0)
  

• 	disable_fiq(imx_pcm_fiq);
  

• break;
  

• default:

• return -EINVAL;
  

• }
• return 0;

+}

+static snd_pcm_uframes_t snd_imx_pcm_pointer(struct snd_pcm_substream *substream) +{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• return bytes_to_frames(substream->runtime, iprtd->offset);

+}

+static struct snd_pcm_hardware snd_imx_hardware = {

• .info = SNDRV_PCM_INFO_INTERLEAVED |

• SNDRV_PCM_INFO_BLOCK_TRANSFER |
  

• SNDRV_PCM_INFO_MMAP |
  

• SNDRV_PCM_INFO_MMAP_VALID |
  

• SNDRV_PCM_INFO_PAUSE |
  

• SNDRV_PCM_INFO_RESUME,
  

• .formats = SNDRV_PCM_FMTBIT_S16_LE,
• .rate_min = 8000,
• .channels_min = 2,
• .channels_max = 2,
• .buffer_bytes_max = IMX_SSI_DMABUF_SIZE,
• .period_bytes_min = 128,
• .period_bytes_max = 16 * 1024,
• .periods_min = 2,
• .periods_max = 255,
• .fifo_size = 0,

+};

+static int snd_imx_open(struct snd_pcm_substream *substream) +{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd;
• int ret;
• iprtd = kzalloc(sizeof(*iprtd), GFP_KERNEL);
• runtime->private_data = iprtd;
• init_timer(&iprtd->timer);
• iprtd->timer.data = (unsigned long)substream;
• iprtd->timer.function = imx_ssi_timer_callback;
• ret = snd_pcm_hw_constraint_integer(substream->runtime,

• 	SNDRV_PCM_HW_PARAM_PERIODS);
  

• if (ret < 0)

• return ret;
  

• snd_soc_set_runtime_hwparams(substream, &snd_imx_hardware);
• return 0;

+}

+static int snd_imx_close(struct snd_pcm_substream *substream) +{

• struct snd_pcm_runtime *runtime = substream->runtime;
• struct imx_pcm_runtime_data *iprtd = runtime->private_data;
• del_timer_sync(&iprtd->timer);
• kfree(iprtd);
• return 0;

+}

+static struct snd_pcm_ops imx_pcm_ops = {

• .open = snd_imx_open,
• .close = snd_imx_close,
• .ioctl = snd_pcm_lib_ioctl,
• .hw_params = snd_imx_pcm_hw_params,
• .prepare = snd_imx_pcm_prepare,
• .trigger = snd_imx_pcm_trigger,
• .pointer = snd_imx_pcm_pointer,
• .mmap = snd_imx_pcm_mmap,

+};

+static int imx_pcm_fiq_new(struct snd_card *card, struct snd_soc_dai *dai,

• struct snd_pcm *pcm)

+{

• int ret;
• ret = imx_pcm_new(card, dai, pcm);
• if (ret)

• return ret;
  

• if (dai->playback.channels_min) {

• struct snd_pcm_substream *substream =
  

• 	pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
  

• struct snd_dma_buffer *buf = &substream->dma_buffer;
  

• imx_ssi_fiq_tx_buffer = (unsigned long)buf->area;
  

• }
• if (dai->capture.channels_min) {

• struct snd_pcm_substream *substream =
  

• 	pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
  

• struct snd_dma_buffer *buf = &substream->dma_buffer;
  

• imx_ssi_fiq_rx_buffer = (unsigned long)buf->area;
  

• }
• set_fiq_handler(&imx_ssi_fiq_start,

• &imx_ssi_fiq_end - &imx_ssi_fiq_start);
  

• return 0;

+}

+static struct snd_soc_platform imx_soc_platform_fiq = {

• .pcm_ops = &imx_pcm_ops,
• .pcm_new = imx_pcm_fiq_new,
• .pcm_free = imx_pcm_free,

+};

+struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev,

• struct imx_ssi *ssi)
  

+{

• int ret = 0;
• ret = claim_fiq(&fh);
• if (ret) {

• dev_err(&pdev->dev, "failed to claim fiq: %d", ret);
  

• return ERR_PTR(ret);
  

• }
• mxc_set_irq_fiq(ssi->irq, 1);
• imx_pcm_fiq = ssi->irq;
• imx_ssi_fiq_base = (unsigned long)ssi->base;
• ssi->dma_params_tx.burstsize = 4;
• ssi->dma_params_rx.burstsize = 6;
• return &imx_soc_platform_fiq;

+}

+void imx_ssi_fiq_exit(struct platform_device *pdev,

• struct imx_ssi *ssi)
  

+{

• mxc_set_irq_fiq(ssi->irq, 0);
• release_fiq(&fh);

+}

diff --git a/sound/soc/imx/imx-ssi.c b/sound/soc/imx/imx-ssi.c new file mode 100644 index 0000000..c57a11f --- /dev/null +++ b/sound/soc/imx/imx-ssi.c @@ -0,0 +1,762 @@ +/*

• • imx-ssi.c -- ALSA Soc Audio Layer
• • Copyright 2009 Sascha Hauer s.hauer@pengutronix.de
• • This code is based on code copyrighted by Freescale,
• • Liam Girdwood, Javier Martin and probably others.
• • 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.
• • The i.MX SSI core has some nasty limitations in AC97 mode. While most
• • sane processor vendors have a FIFO per AC97 slot, the i.MX has only
• • one FIFO which combines all valid receive slots. We cannot even select
• • which slots we want to receive. The WM9712 with which this driver
• • was developped with always sends GPIO status data in slot 12 which
• • we receive in our (PCM-) data stream. The only chance we have is to
• • manually skip this data in the FIQ handler. With sampling rates different
• • from 48000Hz not every frame has valid receive data, so the ratio
• • between pcm data and GPIO status data changes. Our FIQ handler is not
• • able to handle this, hence this driver only works with 48000Hz sampling
• • rate.
• • Reading and writing AC97 registers is another challange. The core
• • provides us status bits when the read register is updated with *another*
• • value. When we read the same register two times (and the register still
• • contains the same value) these status bits are not set. We work
• • around this by not polling these bits but only wait a fixed delay.
• */

+#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h>

+#include <sound/core.h> +#include <sound/initval.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/soc.h>

+#include <mach/ssi.h> +#include <mach/hardware.h>

+#include "imx-ssi.h"

+#define SSI_SACNT_DEFAULT (SSI_SACNT_AC97EN | SSI_SACNT_FV)

+/*

• • SSI Network Mode or TDM slots configuration.
• • Should only be called when port is inactive (i.e. SSIEN = 0).
• */

+static int imx_ssi_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai,

• unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)

+{

• struct imx_ssi *ssi = container_of(cpu_dai, struct imx_ssi, dai);
• u32 sccr;
• sccr = readl(ssi->base + SSI_STCCR);
• sccr &= ~SSI_STCCR_DC_MASK;
• sccr |= SSI_STCCR_DC(slots - 1);
• writel(sccr, ssi->base + SSI_STCCR);
• sccr = readl(ssi->base + SSI_SRCCR);
• sccr &= ~SSI_STCCR_DC_MASK;
• sccr |= SSI_STCCR_DC(slots - 1);
• writel(sccr, ssi->base + SSI_SRCCR);
• writel(tx_mask, ssi->base + SSI_STMSK);
• writel(rx_mask, ssi->base + SSI_SRMSK);
• return 0;

+}

+/*

• • SSI DAI format configuration.
• • Should only be called when port is inactive (i.e. SSIEN = 0).
• • Note: We don't use the I2S modes but instead manually configure the
• • SSI for I2S because the I2S mode is only a register preset.
• */

+static int imx_ssi_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt) +{

• struct imx_ssi *ssi = container_of(cpu_dai, struct imx_ssi, dai);
• u32 strcr = 0, scr;
• scr = readl(ssi->base + SSI_SCR) & ~(SSI_SCR_SYN | SSI_SCR_NET);
• /* DAI mode */
• switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
• case SND_SOC_DAIFMT_I2S:

• /* data on rising edge of bclk, frame low 1clk before data */
  

• strcr |= SSI_STCR_TFSI | SSI_STCR_TEFS | SSI_STCR_TXBIT0;
  

• scr |= SSI_SCR_NET;
  

• break;
  

• case SND_SOC_DAIFMT_LEFT_J:

• /* data on rising edge of bclk, frame high with data */
  

• strcr |= SSI_STCR_TXBIT0;
  

• break;
  

• case SND_SOC_DAIFMT_DSP_B:

• /* data on rising edge of bclk, frame high with data */
  

• strcr |= SSI_STCR_TFSL;
  

• break;
  

• case SND_SOC_DAIFMT_DSP_A:

• /* data on rising edge of bclk, frame high 1clk before data */
  

• strcr |= SSI_STCR_TFSL | SSI_STCR_TEFS;
  

• break;
  

• }
• /* DAI clock inversion */
• switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
• case SND_SOC_DAIFMT_IB_IF:

• strcr |= SSI_STCR_TFSI;
  

• strcr &= ~SSI_STCR_TSCKP;
  

• break;
  

• case SND_SOC_DAIFMT_IB_NF:

• strcr &= ~(SSI_STCR_TSCKP | SSI_STCR_TFSI);
  

• break;
  

• case SND_SOC_DAIFMT_NB_IF:

• strcr |= SSI_STCR_TFSI | SSI_STCR_TSCKP;
  

• break;
  

• case SND_SOC_DAIFMT_NB_NF:

• strcr &= ~SSI_STCR_TFSI;
  

• strcr |= SSI_STCR_TSCKP;
  

• break;
  

• }
• /* DAI clock master masks */
• switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
• case SND_SOC_DAIFMT_CBS_CFS:

• strcr |= SSI_STCR_TFDIR | SSI_STCR_TXDIR;
  

• break;
  

• case SND_SOC_DAIFMT_CBM_CFS:

• strcr |= SSI_STCR_TFDIR;
  

• break;
  

• case SND_SOC_DAIFMT_CBS_CFM:

• strcr |= SSI_STCR_TXDIR;
  

• break;
  

• }
• strcr |= SSI_STCR_TFEN0;
• writel(strcr, ssi->base + SSI_STCR);
• writel(strcr, ssi->base + SSI_SRCR);
• writel(scr, ssi->base + SSI_SCR);
• return 0;

+}

+/*

• • SSI system clock configuration.
• • Should only be called when port is inactive (i.e. SSIEN = 0).
• */

+static int imx_ssi_set_dai_sysclk(struct snd_soc_dai *cpu_dai,

• 		  int clk_id, unsigned int freq, int dir)
  

+{

• struct imx_ssi *ssi = container_of(cpu_dai, struct imx_ssi, dai);
• u32 scr;
• scr = readl(ssi->base + SSI_SCR);
• switch (clk_id) {
• case IMX_SSP_SYS_CLK:

• if (dir == SND_SOC_CLOCK_OUT)
  

• 	scr |= SSI_SCR_SYS_CLK_EN;
  

• else
  

• 	scr &= ~SSI_SCR_SYS_CLK_EN;
  

• break;
  

• default:

• return -EINVAL;
  

• }
• writel(scr, ssi->base + SSI_SCR);
• return 0;

+}

+/*

• • SSI Clock dividers
• • Should only be called when port is inactive (i.e. SSIEN = 0).
• */

+static int imx_ssi_set_dai_clkdiv(struct snd_soc_dai *cpu_dai,

• 		  int div_id, int div)
  

+{

• struct imx_ssi *ssi = container_of(cpu_dai, struct imx_ssi, dai);
• u32 stccr, srccr;
• stccr = readl(ssi->base + SSI_STCCR);
• srccr = readl(ssi->base + SSI_SRCCR);
• switch (div_id) {
• case IMX_SSI_TX_DIV_2:

• stccr &= ~SSI_STCCR_DIV2;
  

• stccr |= div;
  

• break;
  

• case IMX_SSI_TX_DIV_PSR:

• stccr &= ~SSI_STCCR_PSR;
  

• stccr |= div;
  

• break;
  

• case IMX_SSI_TX_DIV_PM:

• stccr &= ~0xff;
  

• stccr |= SSI_STCCR_PM(div);
  

• break;
  

• case IMX_SSI_RX_DIV_2:

• stccr &= ~SSI_STCCR_DIV2;
  

• stccr |= div;
  

• break;
  

• case IMX_SSI_RX_DIV_PSR:

• stccr &= ~SSI_STCCR_PSR;
  

• stccr |= div;
  

• break;
  

• case IMX_SSI_RX_DIV_PM:

• stccr &= ~0xff;
  

• stccr |= SSI_STCCR_PM(div);
  

• break;
  

• default:

• return -EINVAL;
  

• }
• writel(stccr, ssi->base + SSI_STCCR);
• writel(srccr, ssi->base + SSI_SRCCR);
• return 0;

+}

+/*

• • Should only be called when port is inactive (i.e. SSIEN = 0),
• • although can be called multiple times by upper layers.
• */

+static int imx_ssi_hw_params(struct snd_pcm_substream *substream,

• 	     struct snd_pcm_hw_params *params,
  

• 	     struct snd_soc_dai *cpu_dai)
  

+{

• struct imx_ssi *ssi = container_of(cpu_dai, struct imx_ssi, dai);
• u32 reg, sccr;
• /* Tx/Rx config */
• if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {

• reg = SSI_STCCR;
  

• cpu_dai->dma_data = &ssi->dma_params_tx;
  

• } else {

• reg = SSI_SRCCR;
  

• cpu_dai->dma_data = &ssi->dma_params_rx;
  

• }
• sccr = readl(ssi->base + reg) & ~SSI_STCCR_WL_MASK;
• /* DAI data (word) size */
• switch (params_format(params)) {
• case SNDRV_PCM_FORMAT_S16_LE:

• sccr |= SSI_SRCCR_WL(16);
  

• break;
  

• case SNDRV_PCM_FORMAT_S20_3LE:

• sccr |= SSI_SRCCR_WL(20);
  

• break;
  

• case SNDRV_PCM_FORMAT_S24_LE:

• sccr |= SSI_SRCCR_WL(24);
  

• break;
  

• }
• writel(sccr, ssi->base + reg);
• return 0;

+}

+static int imx_ssi_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 imx_ssi *ssi = container_of(cpu_dai, struct imx_ssi, dai);
• unsigned int sier_bits, sier;
• unsigned int scr;
• scr = readl(ssi->base + SSI_SCR);
• sier = readl(ssi->base + SSI_SIER);
• if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {

• if (ssi->flags & IMX_SSI_DMA)
  

• 	sier_bits = SSI_SIER_TDMAE;
  

• else
  

• 	sier_bits = SSI_SIER_TIE | SSI_SIER_TFE0_EN;
  

• } else {

• if (ssi->flags & IMX_SSI_DMA)
  

• 	sier_bits = SSI_SIER_RDMAE;
  

• else
  

• 	sier_bits = SSI_SIER_RIE | SSI_SIER_RFF0_EN;
  

• }
• switch (cmd) {
• case SNDRV_PCM_TRIGGER_START:
• case SNDRV_PCM_TRIGGER_RESUME:
• case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:

• if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  

• 	scr |= SSI_SCR_TE;
  

• else
  

• 	scr |= SSI_SCR_RE;
  

• sier |= sier_bits;
  

• if (++ssi->enabled == 1)
  

• 	scr |= SSI_SCR_SSIEN;
  

• break;
  

• case SNDRV_PCM_TRIGGER_STOP:
• case SNDRV_PCM_TRIGGER_SUSPEND:
• case SNDRV_PCM_TRIGGER_PAUSE_PUSH:

• if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
  

• 	scr &= ~SSI_SCR_TE;
  

• else
  

• 	scr &= ~SSI_SCR_RE;
  

• sier &= ~sier_bits;
  

• if (--ssi->enabled == 0)
  

• 	scr &= ~SSI_SCR_SSIEN;
  

• break;
  

• default:

• return -EINVAL;
  

• }
• if (!(ssi->flags & IMX_SSI_USE_AC97))

• /* rx/tx are always enabled to access ac97 registers */
  

• writel(scr, ssi->base + SSI_SCR);
  

• writel(sier, ssi->base + SSI_SIER);
• return 0;

+}

+static struct snd_soc_dai_ops imx_ssi_pcm_dai_ops = {

• .hw_params = imx_ssi_hw_params,
• .set_fmt = imx_ssi_set_dai_fmt,
• .set_clkdiv = imx_ssi_set_dai_clkdiv,
• .set_sysclk = imx_ssi_set_dai_sysclk,
• .set_tdm_slot = imx_ssi_set_dai_tdm_slot,
• .trigger = imx_ssi_trigger,

+};

+static struct snd_soc_dai imx_ssi_dai = {

• .playback = {

• .channels_min = 2,
  

• .channels_max = 2,
  

• .rates = SNDRV_PCM_RATE_8000_96000,
  

• .formats = SNDRV_PCM_FMTBIT_S16_LE,
  

• },
• .capture = {

• .channels_min = 2,
  

• .channels_max = 2,
  

• .rates = SNDRV_PCM_RATE_8000_96000,
  

• .formats = SNDRV_PCM_FMTBIT_S16_LE,
  

• },
• .ops = &imx_ssi_pcm_dai_ops,

+};

+int snd_imx_pcm_mmap(struct snd_pcm_substream *substream,

• struct vm_area_struct *vma)
  

+{

• struct snd_pcm_runtime *runtime = substream->runtime;
• int ret;
• ret = dma_mmap_coherent(NULL, vma, runtime->dma_area,

• 	runtime->dma_addr, runtime->dma_bytes);
  

• pr_debug("%s: ret: %d %p 0x%08x 0x%08x\n", __func__, ret,

• 	runtime->dma_area,
  

• 	runtime->dma_addr,
  

• 	runtime->dma_bytes);
  

• return ret;

+}

+static int imx_pcm_preallocate_dma_buffer(struct snd_pcm *pcm, int stream) +{

• struct snd_pcm_substream *substream = pcm->streams[stream].substream;
• struct snd_dma_buffer *buf = &substream->dma_buffer;
• size_t size = IMX_SSI_DMABUF_SIZE;
• buf->dev.type = SNDRV_DMA_TYPE_DEV;
• buf->dev.dev = pcm->card->dev;
• buf->private_data = NULL;
• buf->area = dma_alloc_writecombine(pcm->card->dev, size,

• 			   &buf->addr, GFP_KERNEL);
  

• if (!buf->area)

• return -ENOMEM;
  

• buf->bytes = size;
• return 0;

+}

+static u64 imx_pcm_dmamask = DMA_BIT_MASK(32);

+int imx_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,

• struct snd_pcm *pcm)

+{

• int ret = 0;
• if (!card->dev->dma_mask)

• card->dev->dma_mask = &imx_pcm_dmamask;
  

• if (!card->dev->coherent_dma_mask)

• card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
  

• if (dai->playback.channels_min) {

• ret = imx_pcm_preallocate_dma_buffer(pcm,
  

• 	SNDRV_PCM_STREAM_PLAYBACK);
  

• if (ret)
  

• 	goto out;
  

• }
• if (dai->capture.channels_min) {

• ret = imx_pcm_preallocate_dma_buffer(pcm,
  

• 	SNDRV_PCM_STREAM_CAPTURE);
  

• if (ret)
  

• 	goto out;
  

• }

+out:

• return ret;

+}

+void imx_pcm_free(struct snd_pcm *pcm) +{

• struct snd_pcm_substream *substream;
• struct snd_dma_buffer *buf;
• int stream;
• for (stream = 0; stream < 2; stream++) {

• substream = pcm->streams[stream].substream;
  

• if (!substream)
  

• 	continue;
  

• buf = &substream->dma_buffer;
  

• if (!buf->area)
  

• 	continue;
  

• dma_free_writecombine(pcm->card->dev, buf->bytes,
  

• 		      buf->area, buf->addr);
  

• buf->area = NULL;
  

• }

+}

+struct snd_soc_platform imx_soc_platform = {

• .name = "imx-audio",

+}; +EXPORT_SYMBOL_GPL(imx_soc_platform);

+static struct snd_soc_dai imx_ac97_dai = {

• .name = "AC97",
• .ac97_control = 1,
• .playback = {

• .stream_name = "AC97 Playback",
  

• .channels_min = 2,
  

• .channels_max = 2,
  

• .rates = SNDRV_PCM_RATE_48000,
  

• .formats = SNDRV_PCM_FMTBIT_S16_LE,
  

• },
• .capture = {

• .stream_name = "AC97 Capture",
  

• .channels_min = 2,
  

• .channels_max = 2,
  

• .rates = SNDRV_PCM_RATE_48000,
  

• .formats = SNDRV_PCM_FMTBIT_S16_LE,
  

• },
• .ops = &imx_ssi_pcm_dai_ops,

+};

+static void setup_channel_to_ac97(struct imx_ssi *imx_ssi) +{

• void __iomem *base = imx_ssi->base;
• writel(0x0, base + SSI_SCR);
• writel(0x0, base + SSI_STCR);
• writel(0x0, base + SSI_SRCR);
• writel(SSI_SCR_SYN | SSI_SCR_NET, base + SSI_SCR);
• writel(SSI_SFCSR_RFWM0(8) |

• SSI_SFCSR_TFWM0(8) |
  

• SSI_SFCSR_RFWM1(8) |
  

• SSI_SFCSR_TFWM1(8), base + SSI_SFCSR);
  

• writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_STCCR);
• writel(SSI_STCCR_WL(16) | SSI_STCCR_DC(12), base + SSI_SRCCR);
• writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN, base + SSI_SCR);
• writel(SSI_SOR_WAIT(3), base + SSI_SOR);
• writel(SSI_SCR_SYN | SSI_SCR_NET | SSI_SCR_SSIEN |

• 	SSI_SCR_TE | SSI_SCR_RE,
  

• 	base + SSI_SCR);
  

• writel(SSI_SACNT_DEFAULT, base + SSI_SACNT);
• writel(0xff, base + SSI_SACCDIS);
• writel(0x300, base + SSI_SACCEN);

+}

+static struct imx_ssi *ac97_ssi;

+static void imx_ssi_ac97_write(struct snd_ac97 *ac97, unsigned short reg,

• unsigned short val)
  

+{

• struct imx_ssi *imx_ssi = ac97_ssi;
• void __iomem *base = imx_ssi->base;
• unsigned int lreg;
• unsigned int lval;
• if (reg > 0x7f)

• return;
  

• pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
• lreg = reg << 12;
• writel(lreg, base + SSI_SACADD);
• lval = val << 4;
• writel(lval , base + SSI_SACDAT);
• writel(SSI_SACNT_DEFAULT | SSI_SACNT_WR, base + SSI_SACNT);
• udelay(100);

+}

+static unsigned short imx_ssi_ac97_read(struct snd_ac97 *ac97,

• unsigned short reg)
  

+{

• struct imx_ssi *imx_ssi = ac97_ssi;
• void __iomem *base = imx_ssi->base;
• unsigned short val = -1;
• unsigned int lreg;
• lreg = (reg & 0x7f) << 12 ;
• writel(lreg, base + SSI_SACADD);
• writel(SSI_SACNT_DEFAULT | SSI_SACNT_RD, base + SSI_SACNT);
• udelay(100);
• val = (readl(base + SSI_SACDAT) >> 4) & 0xffff;
• pr_debug("%s: 0x%02x 0x%04x\n", __func__, reg, val);
• return val;

+}

+static void imx_ssi_ac97_reset(struct snd_ac97 *ac97) +{

• struct imx_ssi *imx_ssi = ac97_ssi;
• if (imx_ssi->ac97_reset)

• imx_ssi->ac97_reset(ac97);
  

+}

+static void imx_ssi_ac97_warm_reset(struct snd_ac97 *ac97) +{

• struct imx_ssi *imx_ssi = ac97_ssi;
• if (imx_ssi->ac97_warm_reset)

• imx_ssi->ac97_warm_reset(ac97);
  

+}

+struct snd_ac97_bus_ops soc_ac97_ops = {

• .read = imx_ssi_ac97_read,
• .write = imx_ssi_ac97_write,
• .reset = imx_ssi_ac97_reset,
• .warm_reset = imx_ssi_ac97_warm_reset

+}; +EXPORT_SYMBOL_GPL(soc_ac97_ops);

+struct snd_soc_dai *imx_ssi_pcm_dai[2]; +EXPORT_SYMBOL_GPL(imx_ssi_pcm_dai);

+static int imx_ssi_probe(struct platform_device *pdev) +{

• struct resource *res;
• struct imx_ssi *ssi;
• struct imx_ssi_platform_data *pdata = pdev->dev.platform_data;
• struct snd_soc_platform *platform;
• int ret = 0;
• unsigned int val;
• ssi = kzalloc(sizeof(*ssi), GFP_KERNEL);
• if (!ssi)

• return -ENOMEM;
  

• if (pdata) {

• ssi->ac97_reset = pdata->ac97_reset;
  

• ssi->ac97_warm_reset = pdata->ac97_warm_reset;
  

• ssi->flags = pdata->flags;
  

• }
• imx_ssi_pcm_dai[pdev->id] = &ssi->dai;
• ssi->irq = platform_get_irq(pdev, 0);
• ssi->clk = clk_get(&pdev->dev, NULL);
• if (IS_ERR(ssi->clk)) {

• ret = PTR_ERR(ssi->clk);
  

• dev_err(&pdev->dev, "Cannot get the clock: %d\n",
  

• 	ret);
  

• goto failed_clk;
  

• }
• clk_enable(ssi->clk);
• res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
• if (!res) {

• ret = -ENODEV;
  

• goto failed_get_resource;
  

• }
• if (!request_mem_region(res->start, resource_size(res), DRV_NAME)) {

• dev_err(&pdev->dev, "request_mem_region failed\n");
  

• ret = -EBUSY;
  

• goto failed_get_resource;
  

• }
• ssi->base = ioremap(res->start, resource_size(res));
• if (!ssi->base) {

• dev_err(&pdev->dev, "ioremap failed\n");
  

• ret = -ENODEV;
  

• goto failed_ioremap;
  

• }
• if (ssi->flags & IMX_SSI_USE_AC97) {

• if (ac97_ssi) {
  

• 	ret = -EBUSY;
  

• 	goto failed_ac97;
  

• }
  

• ac97_ssi = ssi;
  

• setup_channel_to_ac97(ssi);
  

• memcpy(&ssi->dai, &imx_ac97_dai, sizeof(imx_ac97_dai));
  

• } else

• memcpy(&ssi->dai, &imx_ssi_dai, sizeof(imx_ssi_dai));
  

• ssi->dai.id = pdev->id;
• ssi->dai.dev = &pdev->dev;
• ssi->dai.name = kasprintf(GFP_KERNEL, "imx-ssi.%d", pdev->id);
• writel(0x0, ssi->base + SSI_SIER);
• ssi->dma_params_rx.dma_addr = res->start + SSI_SRX0;
• ssi->dma_params_tx.dma_addr = res->start + SSI_STX0;
• res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx0");
• if (res)

• ssi->dma_params_tx.dma = res->start;
  

• res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx0");
• if (res)

• ssi->dma_params_rx.dma = res->start;
  

• ssi->dai.id = pdev->id;
• ssi->dai.dev = &pdev->dev;
• ssi->dai.name = kasprintf(GFP_KERNEL, "imx-ssi.%d", pdev->id);
• if ((cpu_is_mx27() || cpu_is_mx21()) &&

• 	!(ssi->flags & IMX_SSI_USE_AC97)) {
  

• ssi->flags |= IMX_SSI_DMA;
  

• platform = imx_ssi_dma_mx2_init(pdev, ssi);
  

• } else

• platform = imx_ssi_fiq_init(pdev, ssi);
  

• imx_soc_platform.pcm_ops = platform->pcm_ops;
• imx_soc_platform.pcm_new = platform->pcm_new;
• imx_soc_platform.pcm_free = platform->pcm_free;
• val = SSI_SFCSR_TFWM0(ssi->dma_params_tx.burstsize) |

• SSI_SFCSR_RFWM0(ssi->dma_params_rx.burstsize);
  

• writel(val, ssi->base + SSI_SFCSR);
• ret = snd_soc_register_dai(&ssi->dai);
• if (ret) {

• dev_err(&pdev->dev, "register DAI failed\n");
  

• goto failed_register;
  

• }
• platform_set_drvdata(pdev, ssi);
• return 0;

+failed_register: +failed_ac97:

• iounmap(ssi->base);

+failed_ioremap:

• release_mem_region(res->start, resource_size(res));

+failed_get_resource:

• clk_disable(ssi->clk);
• clk_put(ssi->clk);

+failed_clk:

• kfree(ssi);
• return ret;

+}

+static int __devexit imx_ssi_remove(struct platform_device *pdev) +{

• struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
• struct imx_ssi *ssi = platform_get_drvdata(pdev);
• snd_soc_unregister_dai(&ssi->dai);
• if (ssi->flags & IMX_SSI_USE_AC97)

• ac97_ssi = NULL;
  

• if (!(ssi->flags & IMX_SSI_DMA))

• imx_ssi_fiq_exit(pdev, ssi);
  

• iounmap(ssi->base);
• release_mem_region(res->start, resource_size(res));
• clk_disable(ssi->clk);
• clk_put(ssi->clk);
• kfree(ssi);
• return 0;

+}

+static struct platform_driver imx_ssi_driver = {

• .probe = imx_ssi_probe,
• .remove = __devexit_p(imx_ssi_remove),
• .driver = {

• .name = DRV_NAME,
  

• .owner = THIS_MODULE,
  

• },

+};

+static int __init imx_ssi_init(void) +{

• int ret;
• ret = snd_soc_register_platform(&imx_soc_platform);
• if (ret) {

• pr_err("failed to register soc platform: %d\n", ret);
  

• return ret;
  

• }
• ret = platform_driver_register(&imx_ssi_driver);
• if (ret) {

• snd_soc_unregister_platform(&imx_soc_platform);
  

• return ret;
  

• }
• return 0;

+}

+static void __exit imx_ssi_exit(void) +{

• platform_driver_unregister(&imx_ssi_driver);
• snd_soc_unregister_platform(&imx_soc_platform);

+}

+module_init(imx_ssi_init); +module_exit(imx_ssi_exit);

+/* Module information */ +MODULE_AUTHOR("Sascha Hauer, s.hauer@pengutronix.de"); +MODULE_DESCRIPTION("i.MX I2S/ac97 SoC Interface"); +MODULE_LICENSE("GPL");

diff --git a/sound/soc/imx/imx-ssi.h b/sound/soc/imx/imx-ssi.h new file mode 100644 index 0000000..cb2c81f --- /dev/null +++ b/sound/soc/imx/imx-ssi.h @@ -0,0 +1,238 @@ +/*

• • 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.
• */

+#ifndef _IMX_SSI_H +#define _IMX_SSI_H

+#define SSI_STX0 0x00 +#define SSI_STX1 0x04 +#define SSI_SRX0 0x08 +#define SSI_SRX1 0x0c

+#define SSI_SCR 0x10 +#define SSI_SCR_CLK_IST (1 << 9) +#define SSI_SCR_CLK_IST_SHIFT 9 +#define SSI_SCR_TCH_EN (1 << 8) +#define SSI_SCR_SYS_CLK_EN (1 << 7) +#define SSI_SCR_I2S_MODE_NORM (0 << 5) +#define SSI_SCR_I2S_MODE_MSTR (1 << 5) +#define SSI_SCR_I2S_MODE_SLAVE (2 << 5) +#define SSI_I2S_MODE_MASK (3 << 5) +#define SSI_SCR_SYN (1 << 4) +#define SSI_SCR_NET (1 << 3) +#define SSI_SCR_RE (1 << 2) +#define SSI_SCR_TE (1 << 1) +#define SSI_SCR_SSIEN (1 << 0)

+#define SSI_SISR 0x14 +#define SSI_SISR_MASK ((1 << 19) - 1) +#define SSI_SISR_CMDAU (1 << 18) +#define SSI_SISR_CMDDU (1 << 17) +#define SSI_SISR_RXT (1 << 16) +#define SSI_SISR_RDR1 (1 << 15) +#define SSI_SISR_RDR0 (1 << 14) +#define SSI_SISR_TDE1 (1 << 13) +#define SSI_SISR_TDE0 (1 << 12) +#define SSI_SISR_ROE1 (1 << 11) +#define SSI_SISR_ROE0 (1 << 10) +#define SSI_SISR_TUE1 (1 << 9) +#define SSI_SISR_TUE0 (1 << 8) +#define SSI_SISR_TFS (1 << 7) +#define SSI_SISR_RFS (1 << 6) +#define SSI_SISR_TLS (1 << 5) +#define SSI_SISR_RLS (1 << 4) +#define SSI_SISR_RFF1 (1 << 3) +#define SSI_SISR_RFF0 (1 << 2) +#define SSI_SISR_TFE1 (1 << 1) +#define SSI_SISR_TFE0 (1 << 0)

+#define SSI_SIER 0x18 +#define SSI_SIER_RDMAE (1 << 22) +#define SSI_SIER_RIE (1 << 21) +#define SSI_SIER_TDMAE (1 << 20) +#define SSI_SIER_TIE (1 << 19) +#define SSI_SIER_CMDAU_EN (1 << 18) +#define SSI_SIER_CMDDU_EN (1 << 17) +#define SSI_SIER_RXT_EN (1 << 16) +#define SSI_SIER_RDR1_EN (1 << 15) +#define SSI_SIER_RDR0_EN (1 << 14) +#define SSI_SIER_TDE1_EN (1 << 13) +#define SSI_SIER_TDE0_EN (1 << 12) +#define SSI_SIER_ROE1_EN (1 << 11) +#define SSI_SIER_ROE0_EN (1 << 10) +#define SSI_SIER_TUE1_EN (1 << 9) +#define SSI_SIER_TUE0_EN (1 << 8) +#define SSI_SIER_TFS_EN (1 << 7) +#define SSI_SIER_RFS_EN (1 << 6) +#define SSI_SIER_TLS_EN (1 << 5) +#define SSI_SIER_RLS_EN (1 << 4) +#define SSI_SIER_RFF1_EN (1 << 3) +#define SSI_SIER_RFF0_EN (1 << 2) +#define SSI_SIER_TFE1_EN (1 << 1) +#define SSI_SIER_TFE0_EN (1 << 0)

+#define SSI_STCR 0x1c +#define SSI_STCR_TXBIT0 (1 << 9) +#define SSI_STCR_TFEN1 (1 << 8) +#define SSI_STCR_TFEN0 (1 << 7) +#define SSI_FIFO_ENABLE_0_SHIFT 7 +#define SSI_STCR_TFDIR (1 << 6) +#define SSI_STCR_TXDIR (1 << 5) +#define SSI_STCR_TSHFD (1 << 4) +#define SSI_STCR_TSCKP (1 << 3) +#define SSI_STCR_TFSI (1 << 2) +#define SSI_STCR_TFSL (1 << 1) +#define SSI_STCR_TEFS (1 << 0)

+#define SSI_SRCR 0x20 +#define SSI_SRCR_RXBIT0 (1 << 9) +#define SSI_SRCR_RFEN1 (1 << 8) +#define SSI_SRCR_RFEN0 (1 << 7) +#define SSI_FIFO_ENABLE_0_SHIFT 7 +#define SSI_SRCR_RFDIR (1 << 6) +#define SSI_SRCR_RXDIR (1 << 5) +#define SSI_SRCR_RSHFD (1 << 4) +#define SSI_SRCR_RSCKP (1 << 3) +#define SSI_SRCR_RFSI (1 << 2) +#define SSI_SRCR_RFSL (1 << 1) +#define SSI_SRCR_REFS (1 << 0)

+#define SSI_SRCCR 0x28 +#define SSI_SRCCR_DIV2 (1 << 18) +#define SSI_SRCCR_PSR (1 << 17) +#define SSI_SRCCR_WL(x) ((((x) - 2) >> 1) << 13) +#define SSI_SRCCR_DC(x) (((x) & 0x1f) << 8) +#define SSI_SRCCR_PM(x) (((x) & 0xff) << 0) +#define SSI_SRCCR_WL_MASK (0xf << 13) +#define SSI_SRCCR_DC_MASK (0x1f << 8) +#define SSI_SRCCR_PM_MASK (0xff << 0)

+#define SSI_STCCR 0x24 +#define SSI_STCCR_DIV2 (1 << 18) +#define SSI_STCCR_PSR (1 << 17) +#define SSI_STCCR_WL(x) ((((x) - 2) >> 1) << 13) +#define SSI_STCCR_DC(x) (((x) & 0x1f) << 8) +#define SSI_STCCR_PM(x) (((x) & 0xff) << 0) +#define SSI_STCCR_WL_MASK (0xf << 13) +#define SSI_STCCR_DC_MASK (0x1f << 8) +#define SSI_STCCR_PM_MASK (0xff << 0)

+#define SSI_SFCSR 0x2c +#define SSI_SFCSR_RFCNT1(x) (((x) & 0xf) << 28) +#define SSI_RX_FIFO_1_COUNT_SHIFT 28 +#define SSI_SFCSR_TFCNT1(x) (((x) & 0xf) << 24) +#define SSI_TX_FIFO_1_COUNT_SHIFT 24 +#define SSI_SFCSR_RFWM1(x) (((x) & 0xf) << 20) +#define SSI_SFCSR_TFWM1(x) (((x) & 0xf) << 16) +#define SSI_SFCSR_RFCNT0(x) (((x) & 0xf) << 12) +#define SSI_RX_FIFO_0_COUNT_SHIFT 12 +#define SSI_SFCSR_TFCNT0(x) (((x) & 0xf) << 8) +#define SSI_TX_FIFO_0_COUNT_SHIFT 8 +#define SSI_SFCSR_RFWM0(x) (((x) & 0xf) << 4) +#define SSI_SFCSR_TFWM0(x) (((x) & 0xf) << 0) +#define SSI_SFCSR_RFWM0_MASK (0xf << 4) +#define SSI_SFCSR_TFWM0_MASK (0xf << 0)

+#define SSI_STR 0x30 +#define SSI_STR_TEST (1 << 15) +#define SSI_STR_RCK2TCK (1 << 14) +#define SSI_STR_RFS2TFS (1 << 13) +#define SSI_STR_RXSTATE(x) (((x) & 0xf) << 8) +#define SSI_STR_TXD2RXD (1 << 7) +#define SSI_STR_TCK2RCK (1 << 6) +#define SSI_STR_TFS2RFS (1 << 5) +#define SSI_STR_TXSTATE(x) (((x) & 0xf) << 0)

+#define SSI_SOR 0x34 +#define SSI_SOR_CLKOFF (1 << 6) +#define SSI_SOR_RX_CLR (1 << 5) +#define SSI_SOR_TX_CLR (1 << 4) +#define SSI_SOR_INIT (1 << 3) +#define SSI_SOR_WAIT(x) (((x) & 0x3) << 1) +#define SSI_SOR_WAIT_MASK (0x3 << 1) +#define SSI_SOR_SYNRST (1 << 0)

+#define SSI_SACNT 0x38 +#define SSI_SACNT_FRDIV(x) (((x) & 0x3f) << 5) +#define SSI_SACNT_WR (1 << 4) +#define SSI_SACNT_RD (1 << 3) +#define SSI_SACNT_TIF (1 << 2) +#define SSI_SACNT_FV (1 << 1) +#define SSI_SACNT_AC97EN (1 << 0)

+#define SSI_SACADD 0x3c +#define SSI_SACDAT 0x40 +#define SSI_SATAG 0x44 +#define SSI_STMSK 0x48 +#define SSI_SRMSK 0x4c +#define SSI_SACCST 0x50 +#define SSI_SACCEN 0x54 +#define SSI_SACCDIS 0x58

+/* SSI clock sources */ +#define IMX_SSP_SYS_CLK 0

+/* SSI audio dividers */ +#define IMX_SSI_TX_DIV_2 0 +#define IMX_SSI_TX_DIV_PSR 1 +#define IMX_SSI_TX_DIV_PM 2 +#define IMX_SSI_RX_DIV_2 3 +#define IMX_SSI_RX_DIV_PSR 4 +#define IMX_SSI_RX_DIV_PM 5

+extern struct snd_soc_dai *imx_ssi_pcm_dai[2]; +extern struct snd_soc_platform imx_soc_platform;

+#define DRV_NAME "imx-ssi"

+struct imx_pcm_dma_params {

• int dma;
• unsigned long dma_addr;
• int burstsize;

+};

+struct imx_ssi {

• struct snd_soc_dai dai;
• struct platform_device *ac97_dev;
• struct snd_soc_device imx_ac97;
• struct clk *clk;
• void __iomem *base;
• int irq;
• int fiq_enable;
• unsigned int offset;
• unsigned int flags;
• void (*ac97_reset) (struct snd_ac97 *ac97);
• void (*ac97_warm_reset)(struct snd_ac97 *ac97);
• struct imx_pcm_dma_params dma_params_rx;
• struct imx_pcm_dma_params dma_params_tx;
• int enabled;

+};

+struct snd_soc_platform *imx_ssi_fiq_init(struct platform_device *pdev,

• struct imx_ssi *ssi);
  

+void imx_ssi_fiq_exit(struct platform_device *pdev, struct imx_ssi *ssi); +struct snd_soc_platform *imx_ssi_dma_mx2_init(struct platform_device *pdev,

• struct imx_ssi *ssi);
  

+int snd_imx_pcm_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *vma); +int imx_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,

• struct snd_pcm *pcm);

+void imx_pcm_free(struct snd_pcm *pcm);

+/*

• • Do not change this as the FIQ handler depends on this size
• */

+#define IMX_SSI_DMABUF_SIZE (64 * 1024)

+#define DMA_RXFIFO_BURST 0x4 +#define DMA_TXFIFO_BURST 0x6

+#endif /* _IMX_SSI_H */

1.6.5.2