Audio: Start add simulated DAI and host component

src/audio/Kconfig

@@ -334,4 +334,30 @@ config DAI_VERBOSE_GLITCH_WARNINGS
 	  always emit a warning. This option useful to debug issues with
 	  DAI DMA operation and issues with low-latency scheduling.
 
+config ZEPHYR_SIMULATED_HOST_DRIVER
+	bool "Simulate host component"
+	default n
+	help
+	  Select this to replace host-zephyr.c with simulated version of it,
+	  simulated-host-zephyr.c. It replaces all playback content with
+	  internally generated triangle wave. The PCM code is stepped for
+	  every sample by +1 or -1 depending on channel. Each channel will
+	  have unique waveform start base on step and offset. In capture
+	  direction the waveform is passed to user but the PCM samples
+	  are checked for expected triangle wave from the simulated DAI.
+	  If there are missing PCM samples values they are reported as
+	  glitch. The capture pipelines latency is reported when start
+	  of test waveform is detected.
+
+config ZEPHYR_SIMULATED_DAI_DRIVER
+	bool "Simulate DAI component"
+	default n
+	help
+	  Select this to replace dai-zephyr.c with simulated version it,
+	  simulated-dai-zephyr.c. The simulated version skips are DAI device
+	  driver programming and DMA transfer setup and usage. The playback
+	  stream is checked for glitches and playback pipelines delay. The
+	  capture stream is similar triangle wave as generated by simulated
+	  host playback.
+
 endmenu

src/audio/copier/host_copier.h

@@ -37,6 +37,23 @@ struct hc_buf {
 	uint32_t current_end;
 };
 
+struct host_triangle_generator_state {
+	int32_t prev_pcm_value[SOF_IPC_MAX_CHANNELS];
+	int32_t pcm_increment[SOF_IPC_MAX_CHANNELS];
+	int32_t countdown;
+	bool first_copy;
+};
+
+struct host_glitch_detect_state {
+	int32_t prev_pcm_value[SOF_IPC_MAX_CHANNELS];
+	int32_t glitch_count[SOF_IPC_MAX_CHANNELS];
+	int32_t zeros_count[SOF_IPC_MAX_CHANNELS];
+	int32_t ignore_count;
+	bool no_signal[SOF_IPC_MAX_CHANNELS];
+	bool first_value;
+	bool zeros_count_reported;
+};
+
 /**
  * \brief Host component data.
  *
@@ -47,6 +64,10 @@ struct hc_buf {
  * host_size is the host buffer size (in bytes) specified in the IPC parameters.
  */
 struct host_data {
+#if CONFIG_ZEPHYR_SIMULATED_HOST_DRIVER
+	struct host_triangle_generator_state triangle;
+	struct host_glitch_detect_state glitch;
+#endif
 	/* local DMA config */
 	struct dma *dma;
 	struct dma_chan_data *chan;