ASoC: SOF: ops: add readb/writeb helpers

These will be used to add more consistency in the SOF core and
drivers.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20221024165310.246183-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/ops.h

@@ -302,6 +302,15 @@ static inline int snd_sof_debugfs_add_region_item(struct snd_sof_dev *sdev,
 }
 
 /* register IO */
+static inline void snd_sof_dsp_writeb(struct snd_sof_dev *sdev, u32 bar,
+				      u32 offset, u8 value)
+{
+	if (sof_ops(sdev)->writeb)
+		sof_ops(sdev)->writeb(sdev, sdev->bar[bar] + offset, value);
+	else
+		writeb(value,  sdev->bar[bar] + offset);
+}
+
 static inline void snd_sof_dsp_write(struct snd_sof_dev *sdev, u32 bar,
 				     u32 offset, u32 value)
 {
@@ -320,6 +329,15 @@ static inline void snd_sof_dsp_write64(struct snd_sof_dev *sdev, u32 bar,
 		writeq(value, sdev->bar[bar] + offset);
 }
 
+static inline u8 snd_sof_dsp_readb(struct snd_sof_dev *sdev, u32 bar,
+				   u32 offset)
+{
+	if (sof_ops(sdev)->readb)
+		return sof_ops(sdev)->readb(sdev, sdev->bar[bar] + offset);
+	else
+		return readb(sdev->bar[bar] + offset);
+}
+
 static inline u32 snd_sof_dsp_read(struct snd_sof_dev *sdev, u32 bar,
 				   u32 offset)
 {

sound/soc/sof/sof-priv.h

@@ -171,6 +171,10 @@ struct snd_sof_dsp_ops {
 	 * TODO: consider removing these operations and calling respective
 	 * implementations directly
 	 */
+	void (*writeb)(struct snd_sof_dev *sof_dev, void __iomem *addr,
+		       u8 value); /* optional */
+	u8 (*readb)(struct snd_sof_dev *sof_dev,
+		    void __iomem *addr); /* optional */
 	void (*write)(struct snd_sof_dev *sof_dev, void __iomem *addr,
 		      u32 value); /* optional */
 	u32 (*read)(struct snd_sof_dev *sof_dev,