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, 313 insertions, 0 deletions

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 000000000000..19452e44afdc
--- /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;
+}
+