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 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;
+}
+