ASoC: meson: add tdm input driver

Add Amlogic's axg TDM input driver which take the TDM signal of 4 input
lanes and push the decoded audio samples to TODDR fifo

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 08a522b..00d05df 100644 (file)
--- a/sound/soc/meson/Kconfig
+++ b/sound/soc/meson/Kconfig
@@ -27,6 +27,14 @@ config SND_MESON_AXG_TDM_INTERFACE
        tristate
        select SND_MESON_AXG_TDM_FORMATTER
 
+config SND_MESON_AXG_TDMIN
+       tristate "Amlogic AXG TDM Input Support"
+       select SND_MESON_AXG_TDM_FORMATTER
+       select SND_MESON_AXG_TDM_INTERFACE
+       help
+         Select Y or M to add support for TDM input formatter embedded
+         in the Amlogic AXG SoC family
+
 config SND_MESON_AXG_TDMOUT
        tristate "Amlogic AXG TDM Output Support"
        select SND_MESON_AXG_TDM_FORMATTER

diff --git a/sound/soc/meson/Makefile b/sound/soc/meson/Makefile
index a665c6b..f62833f 100644 (file)
--- a/sound/soc/meson/Makefile
+++ b/sound/soc/meson/Makefile
@@ -5,6 +5,7 @@ snd-soc-meson-axg-frddr-objs := axg-frddr.o
 snd-soc-meson-axg-toddr-objs := axg-toddr.o
 snd-soc-meson-axg-tdm-formatter-objs := axg-tdm-formatter.o
 snd-soc-meson-axg-tdm-interface-objs := axg-tdm-interface.o
+snd-soc-meson-axg-tdmin-objs := axg-tdmin.o
 snd-soc-meson-axg-tdmout-objs := axg-tdmout.o
 snd-soc-meson-axg-spdifout-objs := axg-spdifout.o
 
@@ -13,5 +14,6 @@ obj-$(CONFIG_SND_MESON_AXG_FRDDR) += snd-soc-meson-axg-frddr.o
 obj-$(CONFIG_SND_MESON_AXG_TODDR) += snd-soc-meson-axg-toddr.o
 obj-$(CONFIG_SND_MESON_AXG_TDM_FORMATTER) += snd-soc-meson-axg-tdm-formatter.o
 obj-$(CONFIG_SND_MESON_AXG_TDM_INTERFACE) += snd-soc-meson-axg-tdm-interface.o
+obj-$(CONFIG_SND_MESON_AXG_TDMIN) += snd-soc-meson-axg-tdmin.o
 obj-$(CONFIG_SND_MESON_AXG_TDMOUT) += snd-soc-meson-axg-tdmout.o
 obj-$(CONFIG_SND_MESON_AXG_SPDIFOUT) += snd-soc-meson-axg-spdifout.o

diff --git a/sound/soc/meson/axg-tdmin.c b/sound/soc/meson/axg-tdmin.c
new file mode 100644 (file)
index 0000000..bbac44c
--- /dev/null
+++ b/sound/soc/meson/axg-tdmin.c
@@ -0,0 +1,229 @@
+// SPDX-License-Identifier: (GPL-2.0 OR MIT)
+//
+// Copyright (c) 2018 BayLibre, SAS.
+// Author: Jerome Brunet <jbrunet@baylibre.com>
+
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+#include <sound/soc.h>
+#include <sound/soc-dai.h>
+
+#include "axg-tdm-formatter.h"
+
+#define TDMIN_CTRL                     0x00
+#define  TDMIN_CTRL_ENABLE             BIT(31)
+#define  TDMIN_CTRL_I2S_MODE           BIT(30)
+#define  TDMIN_CTRL_RST_OUT            BIT(29)
+#define  TDMIN_CTRL_RST_IN             BIT(28)
+#define  TDMIN_CTRL_WS_INV             BIT(25)
+#define  TDMIN_CTRL_SEL_SHIFT          20
+#define  TDMIN_CTRL_IN_BIT_SKEW_MASK   GENMASK(18, 16)
+#define  TDMIN_CTRL_IN_BIT_SKEW(x)     ((x) << 16)
+#define  TDMIN_CTRL_LSB_FIRST          BIT(5)
+#define  TDMIN_CTRL_BITNUM_MASK        GENMASK(4, 0)
+#define  TDMIN_CTRL_BITNUM(x)          ((x) << 0)
+#define TDMIN_SWAP                     0x04
+#define TDMIN_MASK0                    0x08
+#define TDMIN_MASK1                    0x0c
+#define TDMIN_MASK2                    0x10
+#define TDMIN_MASK3                    0x14
+#define TDMIN_STAT                     0x18
+#define TDMIN_MUTE_VAL                 0x1c
+#define TDMIN_MUTE0                    0x20
+#define TDMIN_MUTE1                    0x24
+#define TDMIN_MUTE2                    0x28
+#define TDMIN_MUTE3                    0x2c
+
+static const struct regmap_config axg_tdmin_regmap_cfg = {
+       .reg_bits       = 32,
+       .val_bits       = 32,
+       .reg_stride     = 4,
+       .max_register   = TDMIN_MUTE3,
+};
+
+static const char * const axg_tdmin_sel_texts[] = {
+       "IN 0", "IN 1", "IN 2", "IN 3", "IN 4", "IN 5",
+};
+
+/* Change to special mux control to reset dapm */
+static SOC_ENUM_SINGLE_DECL(axg_tdmin_sel_enum, TDMIN_CTRL,
+                           TDMIN_CTRL_SEL_SHIFT, axg_tdmin_sel_texts);
+
+static const struct snd_kcontrol_new axg_tdmin_in_mux =
+       SOC_DAPM_ENUM("Input Source", axg_tdmin_sel_enum);
+
+static struct snd_soc_dai *
+axg_tdmin_get_be(struct snd_soc_dapm_widget *w)
+{
+       struct snd_soc_dapm_path *p = NULL;
+       struct snd_soc_dai *be;
+
+       snd_soc_dapm_widget_for_each_source_path(w, p) {
+               if (!p->connect)
+                       continue;
+
+               if (p->source->id == snd_soc_dapm_dai_out)
+                       return (struct snd_soc_dai *)p->source->priv;
+
+               be = axg_tdmin_get_be(p->source);
+               if (be)
+                       return be;
+       }
+
+       return NULL;
+}
+
+static struct axg_tdm_stream *
+axg_tdmin_get_tdm_stream(struct snd_soc_dapm_widget *w)
+{
+       struct snd_soc_dai *be = axg_tdmin_get_be(w);
+
+       if (!be)
+               return NULL;
+
+       return be->capture_dma_data;
+}
+
+static void axg_tdmin_enable(struct regmap *map)
+{
+       /* Apply both reset */
+       regmap_update_bits(map, TDMIN_CTRL,
+                          TDMIN_CTRL_RST_OUT | TDMIN_CTRL_RST_IN, 0);
+
+       /* Clear out reset before in reset */
+       regmap_update_bits(map, TDMIN_CTRL,
+                          TDMIN_CTRL_RST_OUT, TDMIN_CTRL_RST_OUT);
+       regmap_update_bits(map, TDMIN_CTRL,
+                          TDMIN_CTRL_RST_IN,  TDMIN_CTRL_RST_IN);
+
+       /* Actually enable tdmin */
+       regmap_update_bits(map, TDMIN_CTRL,
+                          TDMIN_CTRL_ENABLE, TDMIN_CTRL_ENABLE);
+}
+
+static void axg_tdmin_disable(struct regmap *map)
+{
+       regmap_update_bits(map, TDMIN_CTRL, TDMIN_CTRL_ENABLE, 0);
+}
+
+static int axg_tdmin_prepare(struct regmap *map, struct axg_tdm_stream *ts)
+{
+       unsigned int val = 0;
+
+       /* Set stream skew */
+       switch (ts->iface->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+       case SND_SOC_DAIFMT_I2S:
+       case SND_SOC_DAIFMT_DSP_A:
+               val |= TDMIN_CTRL_IN_BIT_SKEW(3);
+               break;
+
+       case SND_SOC_DAIFMT_LEFT_J:
+       case SND_SOC_DAIFMT_RIGHT_J:
+       case SND_SOC_DAIFMT_DSP_B:
+               val = TDMIN_CTRL_IN_BIT_SKEW(2);
+               break;
+
+       default:
+               pr_err("Unsupported format: %u\n",
+                      ts->iface->fmt & SND_SOC_DAIFMT_FORMAT_MASK);
+               return -EINVAL;
+       }
+
+       /* Set stream format mode */
+       switch (ts->iface->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+       case SND_SOC_DAIFMT_I2S:
+       case SND_SOC_DAIFMT_LEFT_J:
+       case SND_SOC_DAIFMT_RIGHT_J:
+               val |= TDMIN_CTRL_I2S_MODE;
+               break;
+       }
+
+       /* If the sample clock is inverted, invert it back for the formatter */
+       if (axg_tdm_lrclk_invert(ts->iface->fmt))
+               val |= TDMIN_CTRL_WS_INV;
+
+       /* Set the slot width */
+       val |= TDMIN_CTRL_BITNUM(ts->iface->slot_width - 1);
+
+       /*
+        * The following also reset LSB_FIRST which result in the formatter
+        * placing the first bit received at bit 31
+        */
+       regmap_update_bits(map, TDMIN_CTRL,
+                          (TDMIN_CTRL_IN_BIT_SKEW_MASK | TDMIN_CTRL_WS_INV |
+                           TDMIN_CTRL_I2S_MODE | TDMIN_CTRL_LSB_FIRST |
+                           TDMIN_CTRL_BITNUM_MASK), val);
+
+       /* Set static swap mask configuration */
+       regmap_write(map, TDMIN_SWAP, 0x76543210);
+
+       return axg_tdm_formatter_set_channel_masks(map, ts, TDMIN_MASK0);
+}
+
+static const struct snd_soc_dapm_widget axg_tdmin_dapm_widgets[] = {
+       SND_SOC_DAPM_AIF_IN("IN 0", NULL, 0, SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_AIF_IN("IN 1", NULL, 0, SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_AIF_IN("IN 2", NULL, 0, SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_AIF_IN("IN 3", NULL, 0, SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_AIF_IN("IN 4", NULL, 0, SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_AIF_IN("IN 5", NULL, 0, SND_SOC_NOPM, 0, 0),
+       SND_SOC_DAPM_MUX("SRC SEL", SND_SOC_NOPM, 0, 0, &axg_tdmin_in_mux),
+       SND_SOC_DAPM_PGA_E("DEC", SND_SOC_NOPM, 0, 0, NULL, 0,
+                          axg_tdm_formatter_event,
+                          (SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_PRE_PMD)),
+       SND_SOC_DAPM_AIF_OUT("OUT", NULL, 0, SND_SOC_NOPM, 0, 0),
+};
+
+static const struct snd_soc_dapm_route axg_tdmin_dapm_routes[] = {
+       { "SRC SEL", "IN 0", "IN 0" },
+       { "SRC SEL", "IN 1", "IN 1" },
+       { "SRC SEL", "IN 2", "IN 2" },
+       { "SRC SEL", "IN 3", "IN 3" },
+       { "SRC SEL", "IN 4", "IN 4" },
+       { "SRC SEL", "IN 5", "IN 5" },
+       { "DEC", NULL, "SRC SEL" },
+       { "OUT", NULL, "DEC" },
+};
+
+static const struct snd_soc_component_driver axg_tdmin_component_drv = {
+       .dapm_widgets           = axg_tdmin_dapm_widgets,
+       .num_dapm_widgets       = ARRAY_SIZE(axg_tdmin_dapm_widgets),
+       .dapm_routes            = axg_tdmin_dapm_routes,
+       .num_dapm_routes        = ARRAY_SIZE(axg_tdmin_dapm_routes),
+};
+
+static const struct axg_tdm_formatter_ops axg_tdmin_ops = {
+       .get_stream     = axg_tdmin_get_tdm_stream,
+       .prepare        = axg_tdmin_prepare,
+       .enable         = axg_tdmin_enable,
+       .disable        = axg_tdmin_disable,
+};
+
+static const struct axg_tdm_formatter_driver axg_tdmin_drv = {
+       .component_drv  = &axg_tdmin_component_drv,
+       .regmap_cfg     = &axg_tdmin_regmap_cfg,
+       .ops            = &axg_tdmin_ops,
+       .invert_sclk    = false,
+};
+
+static const struct of_device_id axg_tdmin_of_match[] = {
+       {
+               .compatible = "amlogic,axg-tdmin",
+               .data = &axg_tdmin_drv,
+       }, {}
+};
+MODULE_DEVICE_TABLE(of, axg_tdmin_of_match);
+
+static struct platform_driver axg_tdmin_pdrv = {
+       .probe = axg_tdm_formatter_probe,
+       .driver = {
+               .name = "axg-tdmin",
+               .of_match_table = axg_tdmin_of_match,
+       },
+};
+module_platform_driver(axg_tdmin_pdrv);
+
+MODULE_DESCRIPTION("Amlogic AXG TDM input formatter driver");
+MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
+MODULE_LICENSE("GPL v2");