ALSA: hdac: Add support to enable SPIB for hdac ext stream

The drivers need to set the spib and maxfifios values, so add
these new APIs snd_hdac_ext_stream_set_spib() and
snd_hdac_ext_stream_set_spbmaxfifo() APIs

For these APIs we also need to have spib and fifos pointer, so
add these to hdac_ext_stream and initialize them at stream init

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

include/sound/hda_register.h

@@ -160,6 +160,10 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
 #define AZX_SPB_BASE			0x08
 /* Interval used to calculate the iterating register offset */
 #define AZX_SPB_INTERVAL		0x08
+/* SPIB base */
+#define AZX_SPB_SPIB			0x00
+/* SPIB MAXFIFO base*/
+#define AZX_SPB_MAXFIFO			0x04
 
 /* registers of Global Time Synchronization Capability Structure */
 #define AZX_GTS_CAP_ID			0x1

include/sound/hdaudio_ext.h

@@ -63,6 +63,8 @@ enum hdac_ext_stream_type {
  * @hstream: hdac_stream
  * @pphc_addr: processing pipe host stream pointer
  * @pplc_addr: processing pipe link stream pointer
+ * @spib_addr: software position in buffers stream pointer
+ * @fifo_addr: software position Max fifos stream pointer
  * @decoupled: stream host and link is decoupled
  * @link_locked: link is locked
  * @link_prepared: link is prepared
@@ -74,6 +76,9 @@ struct hdac_ext_stream {
 	void __iomem *pphc_addr;
 	void __iomem *pplc_addr;
 
+	void __iomem *spib_addr;
+	void __iomem *fifo_addr;
+
 	bool decoupled:1;
 	bool link_locked:1;
 	bool link_prepared;
@@ -100,6 +105,11 @@ void snd_hdac_ext_stream_decouple(struct hdac_ext_bus *bus,
 				struct hdac_ext_stream *azx_dev, bool decouple);
 void snd_hdac_ext_stop_streams(struct hdac_ext_bus *sbus);
 
+int snd_hdac_ext_stream_set_spib(struct hdac_ext_bus *ebus,
+				 struct hdac_ext_stream *stream, u32 value);
+int snd_hdac_ext_stream_set_spbmaxfifo(struct hdac_ext_bus *ebus,
+				 struct hdac_ext_stream *stream);
+
 void snd_hdac_ext_link_stream_start(struct hdac_ext_stream *hstream);
 void snd_hdac_ext_link_stream_clear(struct hdac_ext_stream *hstream);
 void snd_hdac_ext_link_stream_reset(struct hdac_ext_stream *hstream);

sound/hda/ext/hdac_ext_stream.c

@@ -49,6 +49,16 @@ void snd_hdac_ext_stream_init(struct hdac_ext_bus *ebus,
 				AZX_PPLC_INTERVAL * idx;
 	}
 
+	if (ebus->spbcap) {
+		stream->spib_addr = ebus->spbcap + AZX_SPB_BASE +
+					AZX_SPB_INTERVAL * idx +
+					AZX_SPB_SPIB;
+
+		stream->fifo_addr = ebus->spbcap + AZX_SPB_BASE +
+					AZX_SPB_INTERVAL * idx +
+					AZX_SPB_MAXFIFO;
+	}
+
 	stream->decoupled = false;
 	snd_hdac_stream_init(bus, &stream->hstream, idx, direction, tag);
 }
@@ -434,6 +444,50 @@ void snd_hdac_ext_stream_spbcap_enable(struct hdac_ext_bus *ebus,
 }
 EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_spbcap_enable);
 
+/**
+ * snd_hdac_ext_stream_set_spib - sets the spib value of a stream
+ * @ebus: HD-audio ext core bus
+ * @stream: hdac_ext_stream
+ * @value: spib value to set
+ */
+int snd_hdac_ext_stream_set_spib(struct hdac_ext_bus *ebus,
+				 struct hdac_ext_stream *stream, u32 value)
+{
+	struct hdac_bus *bus = &ebus->bus;
+
+	if (!ebus->spbcap) {
+		dev_err(bus->dev, "Address of SPB capability is NULL");
+		return -EINVAL;
+	}
+
+	writel(value, stream->spib_addr);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_set_spib);
+
+/**
+ * snd_hdac_ext_stream_set_spbmaxfifo - sets the spib value of a stream
+ * @ebus: HD-audio ext core bus
+ * @stream: hdac_ext_stream
+ *
+ * Return maxfifo for the stream
+ */
+int snd_hdac_ext_stream_set_spbmaxfifo(struct hdac_ext_bus *ebus,
+				 struct hdac_ext_stream *stream)
+{
+	struct hdac_bus *bus = &ebus->bus;
+
+	if (!ebus->spbcap) {
+		dev_err(bus->dev, "Address of SPB capability is NULL");
+		return -EINVAL;
+	}
+
+	return readl(stream->fifo_addr);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_set_spbmaxfifo);
+
+
 /**
  * snd_hdac_ext_stop_streams - stop all stream if running
  * @ebus: HD-audio ext core bus