ASoC: Add a new imx-ssi sound driver

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>
Acked-by: Javier Martin <javier.martin@vista-silicon.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 277 insertions, 0 deletions

diff --git a/sound/soc/imx/imx-pcm-fiq.c b/sound/soc/imx/imx-pcm-fiq.c
new file mode 100644
index 000000000000..5532579ece4d
--- /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);
+}
+