ASoC: SOF: Intel: add SoundWire configuration interface

Now that the SoundWire core supports the multi-step initialization,
call the relevant APIs.

The actual hardware enablement can be done in two places, ideally we'd
want to startup the SoundWire IP as soon as possible (while still
taking power rail dependencies into account)

However when suspend/resume is implemented, the DSP device will be
resumed first, and only when the DSP firmware is downloaded/booted
would the SoundWire child devices be resumed, so there are only
marginal benefits in starting the IP earlier for the first probe.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20200325215027.28716-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/intel/hda-loader.c

@@ -399,6 +399,19 @@ int hda_dsp_pre_fw_run(struct snd_sof_dev *sdev)
 /* post fw run operations */
 int hda_dsp_post_fw_run(struct snd_sof_dev *sdev)
 {
+	int ret;
+
+	if (sdev->first_boot) {
+		ret = hda_sdw_startup(sdev);
+		if (ret < 0) {
+			dev_err(sdev->dev,
+				"error: could not startup SoundWire links\n");
+			return ret;
+		}
+	}
+
+	hda_sdw_int_enable(sdev, true);
+
 	/* re-enable clock gating and power gating */
 	return hda_dsp_ctrl_clock_power_gating(sdev, true);
 }

sound/soc/sof/intel/hda.c

@@ -18,7 +18,9 @@
 #include <sound/hdaudio_ext.h>
 #include <sound/hda_register.h>
 
+#include <linux/acpi.h>
 #include <linux/module.h>
+#include <linux/soundwire/sdw_intel.h>
 #include <sound/intel-nhlt.h>
 #include <sound/sof.h>
 #include <sound/sof/xtensa.h>
@@ -34,6 +36,98 @@
 
 #define EXCEPT_MAX_HDR_SIZE	0x400
 
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_INTEL_SOUNDWIRE)
+
+void hda_sdw_int_enable(struct snd_sof_dev *sdev, bool enable)
+{
+	sdw_intel_enable_irq(sdev->bar[HDA_DSP_BAR], enable);
+}
+
+static int hda_sdw_acpi_scan(struct snd_sof_dev *sdev)
+{
+	struct sof_intel_hda_dev *hdev;
+	acpi_handle handle;
+	int ret;
+
+	handle = ACPI_HANDLE(sdev->dev);
+
+	/* save ACPI info for the probe step */
+	hdev = sdev->pdata->hw_pdata;
+
+	ret = sdw_intel_acpi_scan(handle, &hdev->info);
+	if (ret < 0) {
+		dev_err(sdev->dev, "%s failed\n", __func__);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int hda_sdw_probe(struct snd_sof_dev *sdev)
+{
+	struct sof_intel_hda_dev *hdev;
+	struct sdw_intel_res res;
+	acpi_handle handle;
+	void *sdw;
+
+	handle = ACPI_HANDLE(sdev->dev);
+
+	hdev = sdev->pdata->hw_pdata;
+
+	memset(&res, 0, sizeof(res));
+
+	res.mmio_base = sdev->bar[HDA_DSP_BAR];
+	res.irq = sdev->ipc_irq;
+	res.handle = hdev->info.handle;
+	res.parent = sdev->dev;
+
+	/*
+	 * ops and arg fields are not populated for now,
+	 * they will be needed when the DAI callbacks are
+	 * provided
+	 */
+
+	/* we could filter links here if needed, e.g for quirks */
+	res.count = hdev->info.count;
+	res.link_mask = hdev->info.link_mask;
+
+	sdw = sdw_intel_probe(&res);
+	if (!sdw) {
+		dev_err(sdev->dev, "error: SoundWire probe failed\n");
+		return -EINVAL;
+	}
+
+	/* save context */
+	hdev->sdw = sdw;
+
+	return 0;
+}
+
+int hda_sdw_startup(struct snd_sof_dev *sdev)
+{
+	struct sof_intel_hda_dev *hdev;
+
+	hdev = sdev->pdata->hw_pdata;
+
+	return sdw_intel_startup(hdev->sdw);
+}
+
+static int hda_sdw_exit(struct snd_sof_dev *sdev)
+{
+	struct sof_intel_hda_dev *hdev;
+
+	hdev = sdev->pdata->hw_pdata;
+
+	hda_sdw_int_enable(sdev, false);
+
+	if (hdev->sdw)
+		sdw_intel_exit(hdev->sdw);
+	hdev->sdw = NULL;
+
+	return 0;
+}
+#endif
+
 /*
  * Debug
  */
@@ -346,9 +440,12 @@ static const char *fixup_tplg_name(struct snd_sof_dev *sdev,
 static int hda_init_caps(struct snd_sof_dev *sdev)
 {
 	struct hdac_bus *bus = sof_to_bus(sdev);
+	struct snd_sof_pdata *pdata = sdev->pdata;
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
 	struct hdac_ext_link *hlink;
 #endif
+	struct sof_intel_hda_dev *hdev = pdata->hw_pdata;
+	u32 link_mask;
 	int ret = 0;
 
 	device_disable_async_suspend(bus->dev);
@@ -365,6 +462,27 @@ static int hda_init_caps(struct snd_sof_dev *sdev)
 		return ret;
 	}
 
+	/* scan SoundWire capabilities exposed by DSDT */
+	ret = hda_sdw_acpi_scan(sdev);
+	if (ret < 0) {
+		dev_err(sdev->dev, "error: SoundWire ACPI scan error\n");
+		return ret;
+	}
+
+	link_mask = hdev->info.link_mask;
+	if (!link_mask) {
+		/*
+		 * probe/allocated SoundWire resources.
+		 * The hardware configuration takes place in hda_sdw_startup
+		 * after power rails are enabled.
+		 */
+		ret = hda_sdw_probe(sdev);
+		if (ret < 0) {
+			dev_err(sdev->dev, "error: SoundWire probe error\n");
+			return ret;
+		}
+	}
+
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
 	if (bus->mlcap)
 		snd_hdac_ext_bus_get_ml_capabilities(bus);
@@ -622,6 +740,8 @@ int hda_dsp_remove(struct snd_sof_dev *sdev)
 	snd_hdac_ext_bus_device_remove(bus);
 #endif
 
+	hda_sdw_exit(sdev);
+
 	if (!IS_ERR_OR_NULL(hda->dmic_dev))
 		platform_device_unregister(hda->dmic_dev);
 

sound/soc/sof/intel/hda.h

@@ -11,6 +11,8 @@
 #ifndef __SOF_INTEL_HDA_H
 #define __SOF_INTEL_HDA_H
 
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_intel.h>
 #include <sound/compress_driver.h>
 #include <sound/hda_codec.h>
 #include <sound/hdaudio_ext.h>
@@ -436,6 +438,12 @@ struct sof_intel_hda_dev {
 
 	/* delayed work to enter D0I3 opportunistically */
 	struct delayed_work d0i3_work;
+
+	/* ACPI information stored between scan and probe steps */
+	struct sdw_intel_acpi_info info;
+
+	/* sdw context allocated by SoundWire driver */
+	struct sdw_intel_ctx *sdw;
 };
 
 static inline struct hdac_bus *sof_to_bus(struct snd_sof_dev *s)
@@ -654,6 +662,42 @@ int hda_dsp_trace_init(struct snd_sof_dev *sdev, u32 *stream_tag);
 int hda_dsp_trace_release(struct snd_sof_dev *sdev);
 int hda_dsp_trace_trigger(struct snd_sof_dev *sdev, int cmd);
 
+/*
+ * SoundWire support
+ */
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_INTEL_SOUNDWIRE)
+
+int hda_sdw_startup(struct snd_sof_dev *sdev);
+void hda_sdw_int_enable(struct snd_sof_dev *sdev, bool enable);
+
+#else
+
+static inline int hda_sdw_acpi_scan(struct snd_sof_dev *sdev)
+{
+	return 0;
+}
+
+static inline int hda_sdw_probe(struct snd_sof_dev *sdev)
+{
+	return 0;
+}
+
+static inline int hda_sdw_startup(struct snd_sof_dev *sdev)
+{
+	return 0;
+}
+
+static inline int hda_sdw_exit(struct snd_sof_dev *sdev)
+{
+	return 0;
+}
+
+static inline void hda_sdw_int_enable(struct snd_sof_dev *sdev, bool enable)
+{
+}
+
+#endif
+
 /* common dai driver */
 extern struct snd_soc_dai_driver skl_dai[];