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>
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;
+}
+