5 files changed, 551 insertions, 0 deletions

diff --git a/sound/soc/Makefile b/sound/soc/Makefile
index 0237879fd412..8120b52a4686 100644
--- a/sound/soc/Makefile
+++ b/sound/soc/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_SND_SOC)	+= omap/
 obj-$(CONFIG_SND_SOC)   += pxa/
 obj-$(CONFIG_SND_SOC)   += s3c24xx/
 obj-$(CONFIG_SND_SOC)   += sh/
+obj-$(CONFIG_SND_SOC)   += imx/
diff --git a/sound/soc/imx/Kconfig b/sound/soc/imx/Kconfig
new file mode 100644
index 000000000000..a1bf053bf462
--- /dev/null
+++ b/sound/soc/imx/Kconfig
@@ -0,0 +1,11 @@
+config SND_MX1_MX2_SOC
+        tristate "SoC Audio for Freecale i.MX1x i.MX2x CPUs"
+        depends on (ARCH_MX2 || ARCH_MX1) && SND
+        select SND_PCM
+        help
+          Say Y or M if you want to add support for codecs attached to
+          the MX1 or MX2 SSI interface.
+
+
+
+
diff --git a/sound/soc/imx/Makefile b/sound/soc/imx/Makefile
new file mode 100644
index 000000000000..c390f0f6960d
--- /dev/null
+++ b/sound/soc/imx/Makefile
@@ -0,0 +1,4 @@
+# i.MX Platform Support
+snd-soc-mx1_mx2-objs := mx1_mx2-pcm.o
+
+obj-$(CONFIG_SND_MX1_MX2_SOC) += snd-soc-mx1_mx2.o
diff --git a/sound/soc/imx/mx1_mx2-pcm.c b/sound/soc/imx/mx1_mx2-pcm.c
new file mode 100644
index 000000000000..94807f844131
--- /dev/null
+++ b/sound/soc/imx/mx1_mx2-pcm.c
@@ -0,0 +1,487 @@
+/*
+ * mx1_mx2-pcm.c -- ALSA SoC interface for Freescale i.MX1x, i.MX2x CPUs
+ *
+ * Copyright 2009 Vista Silicon S.L.
+ * Author: Javier Martin
+ *         javier.martin@vista-silicon.com
+ *
+ * Based on mxc-pcm.c by Liam Girdwood.
+ *
+ * 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 <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <asm/dma.h>
+#include <mach/hardware.h>
+#include <mach/dma-mx1-mx2.h>
+
+#include "mx1_mx2-pcm.h"
+
+
+static const struct snd_pcm_hardware mx1_mx2_pcm_hardware = {
+        .info                   = (SNDRV_PCM_INFO_INTERLEAVED |
+                                   SNDRV_PCM_INFO_BLOCK_TRANSFER |
+                                   SNDRV_PCM_INFO_MMAP |
+                                   SNDRV_PCM_INFO_MMAP_VALID),
+        .formats                = SNDRV_PCM_FMTBIT_S16_LE,
+        .buffer_bytes_max       = 32 * 1024,
+        .period_bytes_min       = 64,
+        .period_bytes_max       = 8 * 1024,
+        .periods_min            = 2,
+        .periods_max            = 255,
+        .fifo_size              = 0,
+};
+
+struct mx1_mx2_runtime_data {
+        int dma_ch;
+        int active;
+        unsigned int period;
+        unsigned int periods;
+        int tx_spin;
+        spinlock_t dma_lock;
+        struct mx1_mx2_pcm_dma_params *dma_params;
+};
+
+
+/**
+  * This function stops the current dma transfer for playback
+  * and clears the dma pointers.
+  *
+  * @param      substream       pointer to the structure of the current stream.
+  *
+  */
+static int audio_stop_dma(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct mx1_mx2_runtime_data *prtd = runtime->private_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&prtd->dma_lock, flags);
+
+        pr_debug("%s\n", __func__);
+
+        prtd->active = 0;
+        prtd->period = 0;
+        prtd->periods = 0;
+
+        /* this stops the dma channel and clears the buffer ptrs */
+
+        imx_dma_disable(prtd->dma_ch);
+
+        spin_unlock_irqrestore(&prtd->dma_lock, flags);
+
+        return 0;
+}
+
+/**
+  * This function is called whenever a new audio block needs to be
+  * transferred to the codec. The function receives the address and the size
+  * of the new block and start a new DMA transfer.
+  *
+  * @param      substream       pointer to the structure of the current stream.
+  *
+  */
+static int dma_new_period(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime =  substream->runtime;
+        struct mx1_mx2_runtime_data *prtd = runtime->private_data;
+        unsigned int dma_size;
+        unsigned int offset;
+        int ret = 0;
+        dma_addr_t mem_addr;
+        unsigned int dev_addr;
+
+        if (prtd->active) {
+                dma_size = frames_to_bytes(runtime, runtime->period_size);
+                offset = dma_size * prtd->period;
+
+                pr_debug("%s: period (%d) out of (%d)\n", __func__,
+                        prtd->period,
+                        runtime->periods);
+                pr_debug("period_size %d frames\n offset %d bytes\n",
+                        (unsigned int)runtime->period_size,
+                        offset);
+                pr_debug("dma_size %d bytes\n", dma_size);
+
+                snd_BUG_ON(dma_size > mx1_mx2_pcm_hardware.period_bytes_max);
+
+                mem_addr = (dma_addr_t)(runtime->dma_addr + offset);
+                dev_addr = prtd->dma_params->per_address;
+                pr_debug("%s: mem_addr is %x\n dev_addr is %x\n",
+                                 __func__, mem_addr, dev_addr);
+
+                ret = imx_dma_setup_single(prtd->dma_ch, mem_addr,
+                                        dma_size, dev_addr,
+                                        prtd->dma_params->transfer_type);
+                if (ret < 0) {
+                        printk(KERN_ERR "Error configuring DMA\n");
+                        return ret;
+                }
+                imx_dma_enable(prtd->dma_ch);
+
+                pr_debug("%s: transfer enabled\nmem_addr = %x\n",
+                        __func__, (unsigned int) mem_addr);
+                pr_debug("dev_addr = %x\ndma_size = %d\n",
+                        (unsigned int) dev_addr, dma_size);
+
+                prtd->tx_spin = 1; /* FGA little trick to retrieve DMA pos */
+                prtd->period++;
+                prtd->period %= runtime->periods;
+    }
+        return ret;
+}
+
+
+/**
+  * This is a callback which will be called
+  * when a TX transfer finishes. The call occurs
+  * in interrupt context.
+  *
+  * @param      dat     pointer to the structure of the current stream.
+  *
+  */
+static void audio_dma_irq(int channel, void *data)
+{
+        struct snd_pcm_substream *substream;
+        struct snd_pcm_runtime *runtime;
+        struct mx1_mx2_runtime_data *prtd;
+        unsigned int dma_size;
+        unsigned int previous_period;
+        unsigned int offset;
+
+        substream = data;
+        runtime = substream->runtime;
+        prtd = runtime->private_data;
+        previous_period  = prtd->periods;
+        dma_size = frames_to_bytes(runtime, runtime->period_size);
+        offset = dma_size * previous_period;
+
+        prtd->tx_spin = 0;
+        prtd->periods++;
+        prtd->periods %= runtime->periods;
+
+        pr_debug("%s: irq per %d offset %x\n", __func__, prtd->periods, offset);
+
+        /*
+          * If we are getting a callback for an active stream then we inform
+          * the PCM middle layer we've finished a period
+          */
+        if (prtd->active)
+                snd_pcm_period_elapsed(substream);
+
+        /*
+          * Trig next DMA transfer
+          */
+        dma_new_period(substream);
+}
+
+/**
+  * This function configures the hardware to allow audio
+  * playback operations. It is called by ALSA framework.
+  *
+  * @param      substream       pointer to the structure of the current stream.
+  *
+  * @return              0 on success, -1 otherwise.
+  */
+static int
+snd_mx1_mx2_prepare(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime =  substream->runtime;
+        struct mx1_mx2_runtime_data *prtd = runtime->private_data;
+
+        prtd->period = 0;
+        prtd->periods = 0;
+
+        return 0;
+}
+
+static int mx1_mx2_pcm_hw_params(struct snd_pcm_substream *substream,
+        struct snd_pcm_hw_params *hw_params)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        int ret;
+
+        ret = snd_pcm_lib_malloc_pages(substream,
+                                        params_buffer_bytes(hw_params));
+        if (ret < 0) {
+                printk(KERN_ERR "%s: failed to malloc pcm pages\n", __func__);
+                return ret;
+        }
+
+        pr_debug("%s: snd_imx1_mx2_audio_hw_params runtime->dma_addr 0x(%x)\n",
+                __func__, (unsigned int)runtime->dma_addr);
+        pr_debug("%s: snd_imx1_mx2_audio_hw_params runtime->dma_area 0x(%x)\n",
+                __func__, (unsigned int)runtime->dma_area);
+        pr_debug("%s: snd_imx1_mx2_audio_hw_params runtime->dma_bytes 0x(%x)\n",
+                __func__, (unsigned int)runtime->dma_bytes);
+
+        return ret;
+}
+
+static int mx1_mx2_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct mx1_mx2_runtime_data *prtd = runtime->private_data;
+
+        imx_dma_free(prtd->dma_ch);
+
+        snd_pcm_lib_free_pages(substream);
+
+        return 0;
+}
+
+static int mx1_mx2_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        struct mx1_mx2_runtime_data *prtd = substream->runtime->private_data;
+        int ret = 0;
+
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+                prtd->tx_spin = 0;
+                /* requested stream startup */
+                prtd->active = 1;
+                pr_debug("%s: starting dma_new_period\n", __func__);
+                ret = dma_new_period(substream);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+                /* requested stream shutdown */
+                pr_debug("%s: stopping dma transfer\n", __func__);
+                ret = audio_stop_dma(substream);
+                break;
+        default:
+                ret = -EINVAL;
+                break;
+        }
+
+        return ret;
+}
+
+static snd_pcm_uframes_t
+mx1_mx2_pcm_pointer(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct mx1_mx2_runtime_data *prtd = runtime->private_data;
+        unsigned int offset = 0;
+
+        /* tx_spin value is used here to check if a transfer is active */
+        if (prtd->tx_spin) {
+                offset = (runtime->period_size * (prtd->periods)) +
+                                                (runtime->period_size >> 1);
+                if (offset >= runtime->buffer_size)
+                        offset = runtime->period_size >> 1;
+        } else {
+                offset = (runtime->period_size * (prtd->periods));
+                if (offset >= runtime->buffer_size)
+                        offset = 0;
+        }
+        pr_debug("%s: pointer offset %x\n", __func__, offset);
+
+        return offset;
+}
+
+static int mx1_mx2_pcm_open(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct mx1_mx2_runtime_data *prtd;
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct mx1_mx2_pcm_dma_params *dma_data = rtd->dai->cpu_dai->dma_data;
+        int ret;
+
+        snd_soc_set_runtime_hwparams(substream, &mx1_mx2_pcm_hardware);
+
+        ret = snd_pcm_hw_constraint_integer(runtime,
+                                        SNDRV_PCM_HW_PARAM_PERIODS);
+        if (ret < 0)
+                return ret;
+
+        prtd = kzalloc(sizeof(struct mx1_mx2_runtime_data), GFP_KERNEL);
+        if (prtd == NULL) {
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        runtime->private_data = prtd;
+
+        if (!dma_data)
+                return -ENODEV;
+
+        prtd->dma_params = dma_data;
+
+        pr_debug("%s: Requesting dma channel (%s)\n", __func__,
+                                                prtd->dma_params->name);
+        prtd->dma_ch = imx_dma_request_by_prio(prtd->dma_params->name,
+                                                DMA_PRIO_HIGH);
+        if (prtd->dma_ch < 0) {
+                printk(KERN_ERR "Error requesting dma channel\n");
+                return ret;
+        }
+        imx_dma_config_burstlen(prtd->dma_ch,
+                                prtd->dma_params->watermark_level);
+
+        ret = imx_dma_config_channel(prtd->dma_ch,
+                        prtd->dma_params->per_config,
+                        prtd->dma_params->mem_config,
+                        prtd->dma_params->event_id, 0);
+
+        if (ret) {
+                pr_debug(KERN_ERR "Error configuring dma channel %d\n",
+                        prtd->dma_ch);
+                return ret;
+        }
+
+        pr_debug("%s: Setting tx dma callback function\n", __func__);
+        ret = imx_dma_setup_handlers(prtd->dma_ch,
+                                audio_dma_irq, NULL,
+                                (void *)substream);
+        if (ret < 0) {
+                printk(KERN_ERR "Error setting dma callback function\n");
+                return ret;
+        }
+        return 0;
+
+ out:
+        return ret;
+}
+
+static int mx1_mx2_pcm_close(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct mx1_mx2_runtime_data *prtd = runtime->private_data;
+
+        kfree(prtd);
+
+        return 0;
+}
+
+static int mx1_mx2_pcm_mmap(struct snd_pcm_substream *substream,
+                                struct vm_area_struct *vma)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        return dma_mmap_writecombine(substream->pcm->card->dev, vma,
+                                     runtime->dma_area,
+                                     runtime->dma_addr,
+                                     runtime->dma_bytes);
+}
+
+struct snd_pcm_ops mx1_mx2_pcm_ops = {
+        .open           = mx1_mx2_pcm_open,
+        .close          = mx1_mx2_pcm_close,
+        .ioctl          = snd_pcm_lib_ioctl,
+        .hw_params      = mx1_mx2_pcm_hw_params,
+        .hw_free        = mx1_mx2_pcm_hw_free,
+        .prepare        = snd_mx1_mx2_prepare,
+        .trigger        = mx1_mx2_pcm_trigger,
+        .pointer        = mx1_mx2_pcm_pointer,
+        .mmap           = mx1_mx2_pcm_mmap,
+};
+
+static u64 mx1_mx2_pcm_dmamask = 0xffffffff;
+
+static int mx1_mx2_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 = mx1_mx2_pcm_hardware.buffer_bytes_max;
+        buf->dev.type = SNDRV_DMA_TYPE_DEV;
+        buf->dev.dev = pcm->card->dev;
+        buf->private_data = NULL;
+
+        /* Reserve uncached-buffered memory area for DMA */
+        buf->area = dma_alloc_writecombine(pcm->card->dev, size,
+                                           &buf->addr, GFP_KERNEL);
+
+        pr_debug("%s: preallocate_dma_buffer: area=%p, addr=%p, size=%d\n",
+                __func__, (void *) buf->area, (void *) buf->addr, size);
+
+        if (!buf->area)
+                return -ENOMEM;
+
+        buf->bytes = size;
+        return 0;
+}
+
+static void mx1_mx2_pcm_free_dma_buffers(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;
+        }
+}
+
+int mx1_mx2_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 = &mx1_mx2_pcm_dmamask;
+        if (!card->dev->coherent_dma_mask)
+                card->dev->coherent_dma_mask = 0xffffffff;
+
+        if (dai->playback.channels_min) {
+                ret = mx1_mx2_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_PLAYBACK);
+                pr_debug("%s: preallocate playback buffer\n", __func__);
+                if (ret)
+                        goto out;
+        }
+
+        if (dai->capture.channels_min) {
+                ret = mx1_mx2_pcm_preallocate_dma_buffer(pcm,
+                        SNDRV_PCM_STREAM_CAPTURE);
+                pr_debug("%s: preallocate capture buffer\n", __func__);
+                if (ret)
+                        goto out;
+        }
+ out:
+        return ret;
+}
+
+struct snd_soc_platform mx1_mx2_soc_platform = {
+        .name           = "mx1_mx2-audio",
+        .pcm_ops        = &mx1_mx2_pcm_ops,
+        .pcm_new        = mx1_mx2_pcm_new,
+        .pcm_free       = mx1_mx2_pcm_free_dma_buffers,
+};
+EXPORT_SYMBOL_GPL(mx1_mx2_soc_platform);
+
+static int __init mx1_mx2_soc_platform_init(void)
+{
+        return snd_soc_register_platform(&mx1_mx2_soc_platform);
+}
+module_init(mx1_mx2_soc_platform_init);
+
+static void __exit mx1_mx2_soc_platform_exit(void)
+{
+        snd_soc_unregister_platform(&mx1_mx2_soc_platform);
+}
+module_exit(mx1_mx2_soc_platform_exit);
+
+MODULE_AUTHOR("Javier Martin, javier.martin@vista-silicon.com");
+MODULE_DESCRIPTION("Freescale i.MX2x, i.MX1x PCM DMA module");
+MODULE_LICENSE("GPL");
diff --git a/sound/soc/imx/mx1_mx2-pcm.h b/sound/soc/imx/mx1_mx2-pcm.h
new file mode 100644
index 000000000000..e1e3a3fd7bfe
--- /dev/null
+++ b/sound/soc/imx/mx1_mx2-pcm.h
@@ -0,0 +1,48 @@
+/*
+ * mx1_mx2-pcm.h :- ASoC platform header for Freescale i.MX1x, i.MX2x
+ *
+ * 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 _MXC_PCM_H
+#define _MXC_PCM_H
+
+/* AUDMUX register definitions */
+#define AUDMUX_IO_BASE_ADDR     IO_ADDRESS(AUDMUX_BASE_ADDR)
+
+#define DAM_HPCR1       (*((volatile u32 *)(AUDMUX_IO_BASE_ADDR + 0x00)))
+#define DAM_HPCR2       (*((volatile u32 *)(AUDMUX_IO_BASE_ADDR + 0x04)))
+#define DAM_HPCR3       (*((volatile u32 *)(AUDMUX_IO_BASE_ADDR + 0x08)))
+#define DAM_PPCR1       (*((volatile u32 *)(AUDMUX_IO_BASE_ADDR + 0x10)))
+#define DAM_PPCR2       (*((volatile u32 *)(AUDMUX_IO_BASE_ADDR + 0x14)))
+#define DAM_PPCR3       (*((volatile u32 *)(AUDMUX_IO_BASE_ADDR + 0x1C)))
+
+#define AUDMUX_HPCR_TFSDIR      (1 << 31)
+#define AUDMUX_HPCR_TCLKDIR     (1 << 30)
+#define AUDMUX_HPCR_TFCSEL(x)   (((x) & 0xff) << 26)
+#define AUDMUX_HPCR_RXDSEL(x)   (((x) & 0x7) << 13)
+#define AUDMUX_HPCR_SYN         (1 << 12)
+
+#define AUDMUX_PPCR_TFSDIR      (1 << 31)
+#define AUDMUX_PPCR_TCLKDIR     (1 << 30)
+#define AUDMUX_PPCR_TFCSEL(x)   (((x) & 0xff) << 26)
+#define AUDMUX_PPCR_RXDSEL(x)   (((x) & 0x7) << 13)
+#define AUDMUX_PPCR_SYN         (1 << 12)
+
+/* DMA information for mx1_mx2 platforms */
+struct mx1_mx2_pcm_dma_params {
+        char *name;                     /* stream identifier */
+        unsigned int transfer_type;     /* READ or WRITE DMA transfer */
+        dma_addr_t per_address;         /* physical address of SSI fifo */
+        int event_id;                   /* fixed DMA number for SSI fifo */
+        int watermark_level;            /* SSI fifo watermark level */
+        int per_config;                 /* DMA Config flags for peripheral */
+        int mem_config;                 /* DMA Config flags for RAM */
+ };
+
+/* platform data */
+extern struct snd_soc_platform mx1_mx2_soc_platform;
+
+#endif