From: Kuninori Morimoto <kuninori.morimoto...@renesas.com>

graph base DT binding are used on V4L2, and ALSA SoC is using different
style of DT. In case of simple case, ALSA SoC supports simple-card
driver.
In the future, V4L2 / ALSA will support HDMI, and then, DT bindings
between V4L2 / ALSA should be merged somehow.
Sometimes, we would like to use DPCM base simple-card on graph base DT.
This patch adds graph base DT binding of simple-scu-card

Signed-off-by: Kuninori Morimoto <kuninori.morimoto...@renesas.com>
---
 sound/soc/generic/Kconfig                 |   8 +
 sound/soc/generic/Makefile                |   2 +
 sound/soc/generic/simple-graph-scu-card.c | 437 ++++++++++++++++++++++++++++++
 3 files changed, 447 insertions(+)
 create mode 100644 sound/soc/generic/simple-graph-scu-card.c

diff --git a/sound/soc/generic/Kconfig b/sound/soc/generic/Kconfig
index 764bc83..c2671c3 100644
--- a/sound/soc/generic/Kconfig
+++ b/sound/soc/generic/Kconfig
@@ -21,3 +21,11 @@ config SND_SIMPLE_GRAPH_CARD
        select SND_SIMPLE_CARD_UTILS
        help
          This option enables generic simple Graph sound card support
+
+config SND_SIMPLE_GRAPH_SCU_CARD
+       tristate "ASoC Simple Graph SCU sound card support"
+       depends on OF
+       select SND_SIMPLE_CARD_UTILS
+       help
+         This option enables generic simple Graph SCU sound card support.
+         It supports DPCM of multi CPU single Codec ststem.
diff --git a/sound/soc/generic/Makefile b/sound/soc/generic/Makefile
index 94eb6f1..fd75b55 100644
--- a/sound/soc/generic/Makefile
+++ b/sound/soc/generic/Makefile
@@ -2,8 +2,10 @@ snd-soc-simple-card-utils-objs := simple-card-utils.o
 snd-soc-simple-card-objs       := simple-card.o
 snd-soc-simple-scu-card-objs   := simple-scu-card.o
 snd-soc-simple-graph-card-objs := simple-graph-card.o
+snd-soc-simple-graph-scu-card-objs     := simple-graph-scu-card.o
 
 obj-$(CONFIG_SND_SIMPLE_CARD_UTILS)    += snd-soc-simple-card-utils.o
 obj-$(CONFIG_SND_SIMPLE_CARD)          += snd-soc-simple-card.o
 obj-$(CONFIG_SND_SIMPLE_SCU_CARD)      += snd-soc-simple-scu-card.o
 obj-$(CONFIG_SND_SIMPLE_GRAPH_CARD)    += snd-soc-simple-graph-card.o
+obj-$(CONFIG_SND_SIMPLE_GRAPH_SCU_CARD)        += 
snd-soc-simple-graph-scu-card.o
diff --git a/sound/soc/generic/simple-graph-scu-card.c 
b/sound/soc/generic/simple-graph-scu-card.c
new file mode 100644
index 0000000..cb23b66
--- /dev/null
+++ b/sound/soc/generic/simple-graph-scu-card.c
@@ -0,0 +1,437 @@
+/*
+ * ASoC simple graph SCU sound card support
+ *
+ * Copyright (C) 2016 Renesas Solutions Corp.
+ * Kuninori Morimoto <kuninori.morimoto...@renesas.com>
+ *
+ * based on
+ *     ${LINUX}/sound/soc/generic/simple-graph-card.c
+ *     ${LINUX}/sound/soc/generic/simple-scu-card.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/string.h>
+#include <sound/jack.h>
+#include <sound/simple_card_utils.h>
+
+struct simple_card_data {
+       struct snd_soc_card snd_card;
+       struct snd_soc_codec_conf codec_conf;
+       struct asoc_simple_dai *dai_props;
+       struct snd_soc_dai_link *dai_link;
+       u32 convert_rate;
+       u32 convert_channels;
+};
+
+#define simple_priv_to_dev(priv) ((priv)->snd_card.dev)
+#define simple_priv_to_link(priv, i) ((priv)->snd_card.dai_link + (i))
+#define simple_priv_to_props(priv, i) ((priv)->dai_props + (i))
+
+#define PREFIX "simple-audio-card,"
+
+static int asoc_simple_card_startup(struct snd_pcm_substream *substream)
+{
+       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
+       struct asoc_simple_dai *dai_props =
+               simple_priv_to_props(priv, rtd->num);
+
+       return clk_prepare_enable(dai_props->clk);
+}
+
+static void asoc_simple_card_shutdown(struct snd_pcm_substream *substream)
+{
+       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
+       struct asoc_simple_dai *dai_props =
+               simple_priv_to_props(priv, rtd->num);
+
+       clk_disable_unprepare(dai_props->clk);
+}
+
+static struct snd_soc_ops asoc_simple_card_ops = {
+       .startup = asoc_simple_card_startup,
+       .shutdown = asoc_simple_card_shutdown,
+};
+
+static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
+{
+       struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
+       struct snd_soc_dai *dai;
+       struct snd_soc_dai_link *dai_link;
+       struct asoc_simple_dai *dai_props;
+       int num = rtd->num;
+
+       dai_link        = simple_priv_to_link(priv, num);
+       dai_props       = simple_priv_to_props(priv, num);
+       dai             = dai_link->dynamic ?
+                               rtd->cpu_dai :
+                               rtd->codec_dai;
+
+       return asoc_simple_card_init_dai(dai, dai_props);
+}
+
+static int asoc_simple_card_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
+                                              struct snd_pcm_hw_params *params)
+{
+       struct simple_card_data *priv = snd_soc_card_get_drvdata(rtd->card);
+       struct snd_interval *rate = hw_param_interval(params,
+                                                     SNDRV_PCM_HW_PARAM_RATE);
+       struct snd_interval *channels = hw_param_interval(params,
+                                                         
SNDRV_PCM_HW_PARAM_CHANNELS);
+
+       if (priv->convert_rate)
+               rate->min =
+               rate->max = priv->convert_rate;
+
+       if (priv->convert_channels)
+               channels->min =
+               channels->max = priv->convert_channels;
+
+       return 0;
+}
+
+static int asoc_simple_card_dai_link_of(struct device_node *port,
+                                       struct device_node *ep,
+                                       struct simple_card_data *priv,
+                                       unsigned int daifmt,
+                                       int idx, int is_fe)
+{
+       struct device *dev = simple_priv_to_dev(priv);
+       struct snd_soc_dai_link *dai_link = simple_priv_to_link(priv, idx);
+       struct asoc_simple_dai *dai_props = simple_priv_to_props(priv, idx);
+       int is_single_links = 0;
+       int ret;
+
+       if (is_fe) {
+               /* BE is dummy */
+               dai_link->codec_of_node         = NULL;
+               dai_link->codec_dai_name        = "snd-soc-dummy-dai";
+               dai_link->codec_name            = "snd-soc-dummy";
+
+               /* FE settings */
+               dai_link->dynamic               = 1;
+               dai_link->dpcm_merged_format    = 1;
+
+               ret = asoc_simple_card_parse_graph_cpu(ep, dai_link,
+                                                      &is_single_links);
+               if (ret)
+                       return ret;
+
+               ret = asoc_simple_card_parse_clk_cpu(ep, dai_link, dai_props);
+               if (ret < 0)
+                       return ret;
+
+               ret = asoc_simple_card_set_dailink_name(dev, dai_link,
+                                                       "fe.%s",
+                                                       dai_link->cpu_dai_name);
+               if (ret < 0)
+                       return ret;
+
+               asoc_simple_card_canonicalize_cpu(dai_link, is_single_links);
+       } else {
+               /* FE is dummy */
+               dai_link->cpu_of_node           = NULL;
+               dai_link->cpu_dai_name          = "snd-soc-dummy-dai";
+               dai_link->cpu_name              = "snd-soc-dummy";
+
+               /* BE settings */
+               dai_link->no_pcm                = 1;
+               dai_link->be_hw_params_fixup    = 
asoc_simple_card_be_hw_params_fixup;
+
+               ret = asoc_simple_card_parse_graph_codec(ep, dai_link);
+               if (ret < 0)
+                       return ret;
+
+               ret = asoc_simple_card_parse_clk_codec(ep, dai_link, dai_props);
+               if (ret < 0)
+                       return ret;
+
+               ret = asoc_simple_card_set_dailink_name(dev, dai_link,
+                                                       "be.%s",
+                                                       
dai_link->codec_dai_name);
+               if (ret < 0)
+                       return ret;
+
+               snd_soc_of_parse_audio_prefix_from_node(&priv->snd_card,
+                                                       port->parent,
+                                                       &priv->codec_conf,
+                                                       dai_link->codec_of_node,
+                                                       PREFIX "prefix");
+       }
+
+       ret = snd_soc_of_parse_tdm_slot(ep,
+                                       &dai_props->tx_slot_mask,
+                                       &dai_props->rx_slot_mask,
+                                       &dai_props->slots,
+                                       &dai_props->slot_width);
+       if (ret)
+               return ret;
+
+       ret = asoc_simple_card_canonicalize_dailink(dai_link);
+       if (ret < 0)
+               return ret;
+
+       dai_link->dai_fmt               = daifmt;
+       dai_link->dpcm_playback         = 1;
+       dai_link->dpcm_capture          = 1;
+       dai_link->ops                   = &asoc_simple_card_ops;
+       dai_link->init                  = asoc_simple_card_dai_init;
+
+       dev_dbg(dev, "\t%s / %04x / %d\n",
+               dai_link->name,
+               dai_link->dai_fmt,
+               dai_props->sysclk);
+
+       return 0;
+}
+
+static int asoc_simple_card_parse_of(struct device_node *node,
+                                    struct simple_card_data *priv)
+{
+       struct device *dev = simple_priv_to_dev(priv);
+       struct device *cpu_dev = dev->parent;
+       struct device_node *ports = of_graph_get_top_port(cpu_dev);
+       struct snd_soc_card *card = &priv->snd_card;
+       struct device_node *port, *cpu_ep, *r_cpu_ep, *codec_ep;
+       unsigned int daifmt = 0;
+       int i, ret, done;
+
+       if (!node)
+               return -EINVAL;
+
+       ret = snd_soc_of_parse_audio_routing_from_node(&priv->snd_card,
+                                                      ports, PREFIX "routing");
+       if (ret)
+               return ret;
+
+       /* sampling rate convert */
+       of_property_read_u32(ports, PREFIX "convert-rate",
+                            &priv->convert_rate);
+
+       /* channels transfer */
+       of_property_read_u32(ports, PREFIX "convert-channels",
+                            &priv->convert_channels);
+
+       /*
+        * it supports multi CPU, single CODEC only here.
+        */
+
+       /* find 1st codec */
+       done = 0;
+       for_each_of_port(node, port) {
+               if (!of_graph_port_type_is_sound(port))
+                       continue;
+
+               for_each_of_endpoint_in_port(port, cpu_ep) {
+                       /* keep for_each for of_node_get/of_node_put */
+                       if (done)
+                               continue;
+
+                       codec_ep = of_graph_get_remote_endpoint(cpu_ep);
+                       r_cpu_ep = of_graph_get_remote_endpoint(codec_ep);
+                       of_node_put(codec_ep);
+                       of_node_put(r_cpu_ep);
+                       if (cpu_ep != r_cpu_ep) {
+                               ret = -EINVAL;
+                               goto parse_of_err;
+                       }
+
+                       ret = asoc_simple_card_parse_daifmt(dev,
+                                                           ports, codec_ep,
+                                                           PREFIX, &daifmt);
+                       if (ret < 0)
+                               goto parse_of_err;
+
+                       done = 1;
+               }
+       }
+
+       /* Front-End (= CPU) */
+       i = 0;
+       for_each_of_port(node, port) {
+               if (!of_graph_port_type_is_sound(port))
+                       continue;
+
+               for_each_of_endpoint_in_port(port, cpu_ep) {
+                       ret = asoc_simple_card_dai_link_of(
+                               port, cpu_ep, priv, daifmt, i, 1);
+                       if (ret < 0)
+                               goto parse_of_err;
+                       i++;
+               }
+       }
+
+       /* Back-End (= Codec) */
+       done = 0;
+       for_each_of_port(node, port) {
+               if (!of_graph_port_type_is_sound(port))
+                       continue;
+
+               /* keep for_each for of_node_get/of_node_put */
+               if (done)
+                       continue;
+
+               for_each_of_endpoint_in_port(port, cpu_ep) {
+                       /* keep for_each for of_node_get/of_node_put */
+                       if (done)
+                               continue;
+
+                       codec_ep = of_graph_get_remote_endpoint(cpu_ep);
+                       r_cpu_ep = of_graph_get_remote_endpoint(codec_ep);
+                       of_node_put(codec_ep);
+                       of_node_put(r_cpu_ep);
+                       if (cpu_ep != r_cpu_ep) {
+                               ret = -EINVAL;
+                               goto parse_of_err;
+                       }
+
+                       ret = asoc_simple_card_dai_link_of(
+                               port, codec_ep, priv, daifmt, i, 0);
+                       if (ret < 0)
+                               goto parse_of_err;
+                       i++;
+
+                       done = 1;
+               }
+       }
+
+       ret = asoc_simple_card_parse_card_name(card, ports, PREFIX);
+       if (ret)
+               return ret;
+
+       dev_dbg(dev, "New card: %s\n",
+               priv->snd_card.name ? priv->snd_card.name : "");
+       dev_dbg(dev, "convert_rate     %d\n", priv->convert_rate);
+       dev_dbg(dev, "convert_channels %d\n", priv->convert_channels);
+
+       return 0;
+parse_of_err:
+       of_node_put(port);
+       of_node_put(cpu_ep);
+
+       return ret;
+}
+
+static int asoc_get_sound_port_count(struct device_node *cpu_node)
+{
+       int num;
+
+       /*
+        * it supports multi CPU, single CODEC only here.
+        */
+
+       /* CPU */
+       num = of_graph_get_sound_endpoint_count(cpu_node);
+
+       /* Codec */
+       num++;
+
+       return num;
+}
+
+static int asoc_simple_card_probe(struct platform_device *pdev)
+{
+       struct simple_card_data *priv;
+       struct snd_soc_dai_link *dai_link;
+       struct asoc_simple_dai *dai_props;
+       struct device *dev = &pdev->dev;
+       struct device *cpu_dev = pdev->dev.parent;
+       struct device_node *cpu_node = cpu_dev->of_node;
+       int num, ret;
+
+       /* Allocate the private data and the DAI link array */
+       priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       num = asoc_get_sound_port_count(cpu_node);
+
+       dai_props = devm_kzalloc(dev, sizeof(*dai_props) * num, GFP_KERNEL);
+       dai_link  = devm_kzalloc(dev, sizeof(*dai_link)  * num, GFP_KERNEL);
+       if (!dai_props || !dai_link)
+               return -ENOMEM;
+
+       priv->dai_props                 = dai_props;
+       priv->dai_link                  = dai_link;
+
+       /* Init snd_soc_card */
+       priv->snd_card.owner            = THIS_MODULE;
+       priv->snd_card.dev              = dev;
+       priv->snd_card.dai_link         = priv->dai_link;
+       priv->snd_card.num_links        = num;
+       priv->snd_card.codec_conf       = &priv->codec_conf;
+       priv->snd_card.num_configs      = 1;
+
+       ret = asoc_simple_card_parse_of(cpu_node, priv);
+       if (ret < 0) {
+               if (ret != -EPROBE_DEFER)
+                       dev_err(dev, "parse error %d\n", ret);
+               goto err;
+       }
+
+       /*
+        * FIXME
+        *
+        * This driver is assuming that it will be called from
+        * asoc_simple_card_try_to_probe_graph_card() which
+        * is using platform_device_register_full().
+        * This means it is not came from DT. But this driver itself
+        * will be used as part of ALSA SoC (= sound card).
+        * Because of these background, it might fail in
+        * snd_pcm_lib_malloc_pages() on .hw_params.
+        * Because, noone cares its dma_ops, and result of get_dma_ops()
+        * is based on its architecture.
+        * So, it should call arch_setup_dma_ops() from somewhere,
+        * otherwise, for example, ARM is no problem, but ARM64 will be fail.
+        * But, of_platform_device_xxx() are not good solution today.
+        * This driver calls it by itself here. Please fixme
+        * see also
+        * linux/sound/soc/generic/simple-card-utils.c ::
+        *      asoc_simple_card_try_to_probe_graph_card()
+        */
+       of_dma_configure(dev, dev->of_node);
+
+       snd_soc_card_set_drvdata(&priv->snd_card, priv);
+
+       ret = devm_snd_soc_register_card(dev, &priv->snd_card);
+       if (ret >= 0)
+               return ret;
+err:
+       asoc_simple_card_clean_reference(&priv->snd_card);
+
+       return ret;
+}
+
+static int asoc_simple_card_remove(struct platform_device *pdev)
+{
+       struct snd_soc_card *card = platform_get_drvdata(pdev);
+       struct simple_card_data *priv = snd_soc_card_get_drvdata(card);
+
+       return asoc_simple_card_clean_reference(&priv->snd_card);
+}
+
+static struct platform_driver asoc_simple_card = {
+       .driver = {
+               .name = "asoc-simple-graph-scu-card",
+       },
+       .probe = asoc_simple_card_probe,
+       .remove = asoc_simple_card_remove,
+};
+module_platform_driver(asoc_simple_card);
+
+MODULE_ALIAS("platform:asoc-simple-graph-scu-card");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("ASoC Simple Graph SCU Sound Card");
+MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto...@renesas.com>");
-- 
1.9.1

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