ASoC: meson: add axg frddr driver

Add the playback memory interface of Amlogic's axg SoCs.
This device pulls data from DDR to an internal FIFO.
This FIFO is then used to feed TDM and SPDIF Output devices.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/meson/Kconfig b/sound/soc/meson/Kconfig
index c3eb5e0503086c5cc86edc14452cd72d259be124..cdd78f62e8d73c9854172f7b09117d86e61bf185 100644 (file)
--- a/sound/soc/meson/Kconfig
+++ b/sound/soc/meson/Kconfig
@@ -5,4 +5,11 @@ config SND_MESON_AXG_FIFO
        tristate
        select REGMAP_MMIO
 
+config SND_MESON_AXG_FRDDR
+       tristate "Amlogic AXG Playback FIFO support"
+       select SND_MESON_AXG_FIFO
+       help
+         Select Y or M to add support for the frontend playback interfaces
+         embedded in the Amlogic AXG SoC family
+
 endmenu

diff --git a/sound/soc/meson/Makefile b/sound/soc/meson/Makefile
index 75289b6b3adeb784fdc675f72336826358cfc8de..9c5d7d4a8e3394f2878d9eaa48daab3f6b8af2c3 100644 (file)
--- a/sound/soc/meson/Makefile
+++ b/sound/soc/meson/Makefile
@@ -1,5 +1,7 @@
 # SPDX-License-Identifier: (GPL-2.0 OR MIT)
 
 snd-soc-meson-axg-fifo-objs := axg-fifo.o
+snd-soc-meson-axg-frddr-objs := axg-frddr.o
 
 obj-$(CONFIG_SND_MESON_AXG_FIFO) += snd-soc-meson-axg-fifo.o
+obj-$(CONFIG_SND_MESON_AXG_FRDDR) += snd-soc-meson-axg-frddr.o

diff --git a/sound/soc/meson/axg-frddr.c b/sound/soc/meson/axg-frddr.c
new file mode 100644 (file)
index 0000000..a6f6f6a
--- /dev/null
+++ b/sound/soc/meson/axg-frddr.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+//
+// Copyright (c) 2018 BayLibre, SAS.
+// Author: Jerome Brunet <jbrunet@baylibre.com>
+
+/* This driver implements the frontend playback DAI of AXG based SoCs */
+
+#include <linux/clk.h>
+#include <linux/regmap.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include "axg-fifo.h"
+
+#define CTRL0_FRDDR_PP_MODE    BIT(30)
+
+static int axg_frddr_dai_startup(struct snd_pcm_substream *substream,
+                                struct snd_soc_dai *dai)
+{
+       struct axg_fifo *fifo = snd_soc_dai_get_drvdata(dai);
+       unsigned int fifo_depth, fifo_threshold;
+       int ret;
+
+       /* Enable pclk to access registers and clock the fifo ip */
+       ret = clk_prepare_enable(fifo->pclk);
+       if (ret)
+               return ret;
+
+       /* Apply single buffer mode to the interface */
+       regmap_update_bits(fifo->map, FIFO_CTRL0, CTRL0_FRDDR_PP_MODE, 0);
+
+       /*
+        * TODO: We could adapt the fifo depth and the fifo threshold
+        * depending on the expected memory throughput and lantencies
+        * For now, we'll just use the same values as the vendor kernel
+        * Depth and threshold are zero based.
+        */
+       fifo_depth = AXG_FIFO_MIN_CNT - 1;
+       fifo_threshold = (AXG_FIFO_MIN_CNT / 2) - 1;
+       regmap_update_bits(fifo->map, FIFO_CTRL1,
+                          CTRL1_FRDDR_DEPTH_MASK | CTRL1_THRESHOLD_MASK,
+                          CTRL1_FRDDR_DEPTH(fifo_depth) |
+                          CTRL1_THRESHOLD(fifo_threshold));
+
+       return 0;
+}
+
+static void axg_frddr_dai_shutdown(struct snd_pcm_substream *substream,
+                                  struct snd_soc_dai *dai)
+{
+       struct axg_fifo *fifo = snd_soc_dai_get_drvdata(dai);
+
+       clk_disable_unprepare(fifo->pclk);
+}
+
+static int axg_frddr_pcm_new(struct snd_soc_pcm_runtime *rtd,
+                            struct snd_soc_dai *dai)
+{
+       return axg_fifo_pcm_new(rtd, SNDRV_PCM_STREAM_PLAYBACK);
+}
+
+static const struct snd_soc_dai_ops axg_frddr_ops = {
+       .startup        = axg_frddr_dai_startup,
+       .shutdown       = axg_frddr_dai_shutdown,
+};
+
+static struct snd_soc_dai_driver axg_frddr_dai_drv = {
+       .name = "FRDDR",
+       .playback = {
+               .stream_name    = "Playback",
+               .channels_min   = 1,
+               .channels_max   = AXG_FIFO_CH_MAX,
+               .rates          = AXG_FIFO_RATES,
+               .formats        = AXG_FIFO_FORMATS,
+       },
+       .ops            = &axg_frddr_ops,
+       .pcm_new        = axg_frddr_pcm_new,
+};
+
+static const char * const axg_frddr_sel_texts[] = {
+       "OUT 0", "OUT 1", "OUT 2", "OUT 3"
+};
+
+static SOC_ENUM_SINGLE_DECL(axg_frddr_sel_enum, FIFO_CTRL0, CTRL0_SEL_SHIFT,
+                           axg_frddr_sel_texts);
+
+static const struct snd_kcontrol_new axg_frddr_out_demux =
+       SOC_DAPM_ENUM("Output Sink", axg_frddr_sel_enum);
+
+static const struct snd_soc_dapm_widget axg_frddr_dapm_widgets[] = {
+       SND_SOC_DAPM_DEMUX("SINK SEL", SND_SOC_NOPM, 0, 0,
+                          &axg_frddr_out_demux),
+       SND_SOC_DAPM_AIF_OUT("OUT 0", NULL, 0, SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_AIF_OUT("OUT 1", NULL, 0, SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_AIF_OUT("OUT 2", NULL, 0, SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_AIF_OUT("OUT 3", NULL, 0, SND_SOC_NOPM, 0, 0),
+};
+
+static const struct snd_soc_dapm_route axg_frddr_dapm_routes[] = {
+       { "SINK SEL", NULL, "Playback" },
+       { "OUT 0", "OUT 0",  "SINK SEL" },
+       { "OUT 1", "OUT 1",  "SINK SEL" },
+       { "OUT 2", "OUT 2",  "SINK SEL" },
+       { "OUT 3", "OUT 3",  "SINK SEL" },
+};
+
+static const struct snd_soc_component_driver axg_frddr_component_drv = {
+       .dapm_widgets           = axg_frddr_dapm_widgets,
+       .num_dapm_widgets       = ARRAY_SIZE(axg_frddr_dapm_widgets),
+       .dapm_routes            = axg_frddr_dapm_routes,
+       .num_dapm_routes        = ARRAY_SIZE(axg_frddr_dapm_routes),
+       .ops                    = &axg_fifo_pcm_ops
+};
+
+static const struct axg_fifo_match_data axg_frddr_match_data = {
+       .component_drv  = &axg_frddr_component_drv,
+       .dai_drv        = &axg_frddr_dai_drv
+};
+
+static const struct of_device_id axg_frddr_of_match[] = {
+       {
+               .compatible = "amlogic,axg-frddr",
+               .data = &axg_frddr_match_data,
+       }, {}
+};
+MODULE_DEVICE_TABLE(of, axg_frddr_of_match);
+
+static struct platform_driver axg_frddr_pdrv = {
+       .probe = axg_fifo_probe,
+       .driver = {
+               .name = "axg-frddr",
+               .of_match_table = axg_frddr_of_match,
+       },
+};
+module_platform_driver(axg_frddr_pdrv);
+
+MODULE_DESCRIPTION("Amlogic AXG playback fifo driver");
+MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
+MODULE_LICENSE("GPL v2");