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-fiq.c b/sound/soc/imx/imx-pcm-fiq.c
new file mode 100644
index 0000000..5532579
--- /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(®s);
+
+ 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(®s);
+ 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(®s);
+
+ 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);
+}
+