[alsa-devel] [PATCH 19/19] ASoC: fsi: Add DMAEngine support
Kuninori Morimoto
kuninori.morimoto.gx at renesas.com
Fri Feb 3 09:59:33 CET 2012
This patch supports DMAEngine to FSI driver.
It supports only Tx case at this point.
If platform/cpu doesn't support DMAEngine, FSI driver will
use PIO transfer.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
include/sound/sh_fsi.h | 2 +
sound/soc/sh/fsi.c | 232 ++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 234 insertions(+), 0 deletions(-)
diff --git a/include/sound/sh_fsi.h b/include/sound/sh_fsi.h
index 78cd77a..b457e87 100644
--- a/include/sound/sh_fsi.h
+++ b/include/sound/sh_fsi.h
@@ -74,6 +74,8 @@
struct sh_fsi_port_info {
unsigned long flags;
+ int tx_id;
+ int rx_id;
int (*set_rate)(struct device *dev, int rate, int enable);
};
diff --git a/sound/soc/sh/fsi.c b/sound/soc/sh/fsi.c
index 1374680..378cc5b 100644
--- a/sound/soc/sh/fsi.c
+++ b/sound/soc/sh/fsi.c
@@ -13,8 +13,11 @@
*/
#include <linux/delay.h>
+#include <linux/dma-mapping.h>
#include <linux/pm_runtime.h>
#include <linux/io.h>
+#include <linux/scatterlist.h>
+#include <linux/sh_dma.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <sound/soc.h>
@@ -53,6 +56,7 @@
/* DO_FMT */
/* DI_FMT */
+#define CR_BWS_MASK (0x3 << 20) /* FSI2 */
#define CR_BWS_24 (0x0 << 20) /* FSI2 */
#define CR_BWS_16 (0x1 << 20) /* FSI2 */
#define CR_BWS_20 (0x2 << 20) /* FSI2 */
@@ -68,6 +72,15 @@
#define CR_TDM (0x4 << 4)
#define CR_TDM_D (0x5 << 4)
+/* OUT_DMAC */
+/* IN_DMAC */
+#define VDMD_MASK (0x3 << 4)
+#define VDMD_FRONT (0x0 << 4) /* Package in front */
+#define VDMD_BACK (0x1 << 4) /* Package in back */
+#define VDMD_STREAM (0x2 << 4) /* Stream mode(16bit * 2) */
+
+#define DMA_ON (0x1 << 0)
+
/* DOFF_CTL */
/* DIFF_CTL */
#define IRQ_HALF 0x00100000
@@ -180,6 +193,14 @@ struct fsi_stream {
*/
struct fsi_stream_handler *handler;
struct fsi_priv *priv;
+
+ /*
+ * these are for DMAEngine
+ */
+ struct dma_chan *chan;
+ struct sh_dmae_slave slave; /* see fsi_handler_init() */
+ struct tasklet_struct tasklet;
+ dma_addr_t dma;
};
struct fsi_priv {
@@ -889,6 +910,212 @@ static irqreturn_t fsi_interrupt(int irq, void *data)
}
/*
+ * dma data transfer handler
+ */
+static int fsi_dma_init(struct fsi_priv *fsi, struct fsi_stream *io)
+{
+ struct snd_pcm_runtime *runtime = io->substream->runtime;
+ struct snd_soc_dai *dai = fsi_get_dai(io->substream);
+ enum dma_data_direction dir = fsi_stream_is_play(fsi, io) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+ io->dma = dma_map_single(dai->dev, runtime->dma_area,
+ snd_pcm_lib_buffer_bytes(io->substream), dir);
+ return 0;
+}
+
+static int fsi_dma_quit(struct fsi_priv *fsi, struct fsi_stream *io)
+{
+ struct snd_soc_dai *dai = fsi_get_dai(io->substream);
+ enum dma_data_direction dir = fsi_stream_is_play(fsi, io) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+ dma_unmap_single(dai->dev, io->dma,
+ snd_pcm_lib_buffer_bytes(io->substream), dir);
+ return 0;
+}
+
+static void fsi_dma_complete(void *data)
+{
+ struct fsi_stream *io = (struct fsi_stream *)data;
+ struct fsi_priv *fsi = fsi_stream_to_priv(io);
+ struct snd_pcm_runtime *runtime = io->substream->runtime;
+ struct snd_soc_dai *dai = fsi_get_dai(io->substream);
+ enum dma_data_direction dir = fsi_stream_is_play(fsi, io) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+ dma_sync_single_for_cpu(dai->dev, io->dma,
+ samples_to_bytes(runtime, io->period_samples), dir);
+
+ io->buff_sample_pos += io->period_samples;
+ io->period_pos++;
+
+ if (io->period_pos >= runtime->periods) {
+ io->period_pos = 0;
+ io->buff_sample_pos = 0;
+ }
+
+ fsi_count_fifo_err(fsi);
+ fsi_stream_transfer(io);
+
+ snd_pcm_period_elapsed(io->substream);
+}
+
+static dma_addr_t fsi_dma_get_area(struct fsi_stream *io)
+{
+ struct snd_pcm_runtime *runtime = io->substream->runtime;
+
+ return io->dma + samples_to_bytes(runtime, io->buff_sample_pos);
+}
+
+static void fsi_dma_do_tasklet(unsigned long data)
+{
+ struct fsi_stream *io = (struct fsi_stream *)data;
+ struct fsi_priv *fsi = fsi_stream_to_priv(io);
+ struct dma_chan *chan;
+ struct snd_soc_dai *dai;
+ struct dma_async_tx_descriptor *desc;
+ struct scatterlist sg;
+ struct snd_pcm_runtime *runtime;
+ enum dma_data_direction dir;
+ dma_cookie_t cookie;
+ int is_play = fsi_stream_is_play(fsi, io);
+ int len;
+ dma_addr_t buf;
+
+ if (!fsi_stream_is_working(fsi, io))
+ return;
+
+ dai = fsi_get_dai(io->substream);
+ chan = io->chan;
+ runtime = io->substream->runtime;
+ dir = is_play ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+ len = samples_to_bytes(runtime, io->period_samples);
+ buf = fsi_dma_get_area(io);
+
+ dma_sync_single_for_device(dai->dev, io->dma, len, dir);
+
+ sg_init_table(&sg, 1);
+ sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf)),
+ len , offset_in_page(buf));
+ sg_dma_address(&sg) = buf;
+ sg_dma_len(&sg) = len;
+
+ desc = chan->device->device_prep_slave_sg(chan, &sg, 1, dir,
+ DMA_PREP_INTERRUPT |
+ DMA_CTRL_ACK);
+ if (!desc) {
+ dev_err(dai->dev, "device_prep_slave_sg() fail\n");
+ return;
+ }
+
+ desc->callback = fsi_dma_complete;
+ desc->callback_param = io;
+
+ cookie = desc->tx_submit(desc);
+ if (cookie < 0) {
+ dev_err(dai->dev, "tx_submit() fail\n");
+ return;
+ }
+
+ dma_async_issue_pending(chan);
+
+ /*
+ * FIXME
+ *
+ * In DMAEngine case, codec and FSI cannot be started simultaneously
+ * since FSI is using tasklet.
+ * Therefore, in capture case, probably FSI FIFO will have got
+ * overflow error in this point.
+ * in that case, DMA cannot start transfer until error was cleared.
+ */
+ if (!is_play) {
+ if (ERR_OVER & fsi_reg_read(fsi, DIFF_ST)) {
+ fsi_reg_mask_set(fsi, DIFF_CTL, FIFO_CLR, FIFO_CLR);
+ fsi_reg_write(fsi, DIFF_ST, 0);
+ }
+ }
+}
+
+static bool fsi_dma_filter(struct dma_chan *chan, void *param)
+{
+ struct sh_dmae_slave *slave = param;
+
+ chan->private = slave;
+
+ return true;
+}
+
+static int fsi_dma_transfer(struct fsi_priv *fsi, struct fsi_stream *io)
+{
+ tasklet_schedule(&io->tasklet);
+
+ return 0;
+}
+
+static void fsi_dma_push_start_stop(struct fsi_priv *fsi, struct fsi_stream *io,
+ int start)
+{
+ u32 bws;
+ u32 dma;
+
+ switch (io->sample_width * start) {
+ case 2:
+ bws = CR_BWS_16;
+ dma = VDMD_STREAM | DMA_ON;
+ break;
+ case 4:
+ bws = CR_BWS_24;
+ dma = VDMD_BACK | DMA_ON;
+ break;
+ default:
+ bws = 0;
+ dma = 0;
+ }
+
+ fsi_reg_mask_set(fsi, DO_FMT, CR_BWS_MASK, bws);
+ fsi_reg_write(fsi, OUT_DMAC, dma);
+}
+
+static int fsi_dma_probe(struct fsi_priv *fsi, struct fsi_stream *io)
+{
+ dma_cap_mask_t mask;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ io->chan = dma_request_channel(mask, fsi_dma_filter, &io->slave);
+ if (!io->chan)
+ return -EIO;
+
+ tasklet_init(&io->tasklet, fsi_dma_do_tasklet, (unsigned long)io);
+
+ return 0;
+}
+
+static int fsi_dma_remove(struct fsi_priv *fsi, struct fsi_stream *io)
+{
+ tasklet_kill(&io->tasklet);
+
+ fsi_stream_stop(fsi, io);
+
+ if (io->chan)
+ dma_release_channel(io->chan);
+
+ io->chan = NULL;
+ return 0;
+}
+
+static struct fsi_stream_handler fsi_dma_push_handler = {
+ .init = fsi_dma_init,
+ .quit = fsi_dma_quit,
+ .probe = fsi_dma_probe,
+ .transfer = fsi_dma_transfer,
+ .remove = fsi_dma_remove,
+ .start_stop = fsi_dma_push_start_stop,
+};
+
+/*
* dai ops
*/
static void fsi_fifo_init(struct fsi_priv *fsi,
@@ -1304,6 +1531,11 @@ static void fsi_handler_init(struct fsi_priv *fsi)
fsi->playback.priv = fsi;
fsi->capture.handler = &fsi_pio_pop_handler; /* default PIO */
fsi->capture.priv = fsi;
+
+ if (fsi->info->tx_id) {
+ fsi->playback.slave.slave_id = fsi->info->tx_id;
+ fsi->playback.handler = &fsi_dma_push_handler;
+ }
}
static int fsi_probe(struct platform_device *pdev)
--
1.7.5.4
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