diff --git a/include/sound/hdaudio.h b/include/sound/hdaudio.h
index 612a17e375d0..4af4af55e854 100644
--- a/include/sound/hdaudio.h
+++ b/include/sound/hdaudio.h
@@ -253,24 +253,6 @@ struct hdac_ext_bus_ops {
 	int (*hdev_detach)(struct hdac_device *hdev);
 };
 
-/*
- * Lowlevel I/O operators
- */
-struct hdac_io_ops {
-	/* mapped register accesses */
-	void (*reg_writel)(u32 value, u32 __iomem *addr);
-	u32 (*reg_readl)(u32 __iomem *addr);
-	void (*reg_writew)(u16 value, u16 __iomem *addr);
-	u16 (*reg_readw)(u16 __iomem *addr);
-	void (*reg_writeb)(u8 value, u8 __iomem *addr);
-	u8 (*reg_readb)(u8 __iomem *addr);
-	/* Allocation ops */
-	int (*dma_alloc_pages)(struct hdac_bus *bus, int type, size_t size,
-			       struct snd_dma_buffer *buf);
-	void (*dma_free_pages)(struct hdac_bus *bus,
-			       struct snd_dma_buffer *buf);
-};
-
 #define HDA_UNSOL_QUEUE_SIZE	64
 #define HDA_MAX_CODECS		8	/* limit by controller side */
 
@@ -304,7 +286,6 @@ struct hdac_rb {
 struct hdac_bus {
 	struct device *dev;
 	const struct hdac_bus_ops *ops;
-	const struct hdac_io_ops *io_ops;
 	const struct hdac_ext_bus_ops *ext_ops;
 
 	/* h/w resources */
@@ -344,6 +325,7 @@ struct hdac_bus {
 	/* CORB/RIRB and position buffers */
 	struct snd_dma_buffer rb;
 	struct snd_dma_buffer posbuf;
+	int dma_type;			/* SNDRV_DMA_TYPE_XXX for CORB/RIRB */
 
 	/* hdac_stream linked list */
 	struct list_head stream_list;
@@ -384,8 +366,7 @@ struct hdac_bus {
 };
 
 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
-		      const struct hdac_bus_ops *ops,
-		      const struct hdac_io_ops *io_ops);
+		      const struct hdac_bus_ops *ops);
 void snd_hdac_bus_exit(struct hdac_bus *bus);
 int snd_hdac_bus_exec_verb(struct hdac_bus *bus, unsigned int addr,
 			   unsigned int cmd, unsigned int *res);
@@ -429,21 +410,38 @@ int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
 int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus);
 void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus);
 
+#ifdef CONFIG_SND_HDA_ALIGNED_MMIO
+unsigned int snd_hdac_aligned_read(void __iomem *addr, unsigned int mask);
+void snd_hdac_aligned_write(unsigned int val, void __iomem *addr,
+			    unsigned int mask);
+#define snd_hdac_reg_writeb(v, addr)	snd_hdac_aligned_write(v, addr, 0xff)
+#define snd_hdac_reg_writew(v, addr)	snd_hdac_aligned_write(v, addr, 0xffff)
+#define snd_hdac_reg_readb(addr)	snd_hdac_aligned_read(addr, 0xff)
+#define snd_hdac_reg_readw(addr)	snd_hdac_aligned_read(addr, 0xffff)
+#else /* CONFIG_SND_HDA_ALIGNED_MMIO */
+#define snd_hdac_reg_writeb(val, addr)	writeb(val, addr)
+#define snd_hdac_reg_writew(val, addr)	writew(val, addr)
+#define snd_hdac_reg_readb(addr)	readb(addr)
+#define snd_hdac_reg_readw(addr)	readw(addr)
+#endif /* CONFIG_SND_HDA_ALIGNED_MMIO */
+#define snd_hdac_reg_writel(val, addr)	writel(val, addr)
+#define snd_hdac_reg_readl(addr)	readl(addr)
+
 /*
  * macros for easy use
  */
 #define _snd_hdac_chip_writeb(chip, reg, value) \
-	((chip)->io_ops->reg_writeb(value, (chip)->remap_addr + (reg)))
+	snd_hdac_reg_writeb(value, (chip)->remap_addr + (reg))
 #define _snd_hdac_chip_readb(chip, reg) \
-	((chip)->io_ops->reg_readb((chip)->remap_addr + (reg)))
+	snd_hdac_reg_readb((chip)->remap_addr + (reg))
 #define _snd_hdac_chip_writew(chip, reg, value) \
-	((chip)->io_ops->reg_writew(value, (chip)->remap_addr + (reg)))
+	snd_hdac_reg_writew(value, (chip)->remap_addr + (reg))
 #define _snd_hdac_chip_readw(chip, reg) \
-	((chip)->io_ops->reg_readw((chip)->remap_addr + (reg)))
+	snd_hdac_reg_readw((chip)->remap_addr + (reg))
 #define _snd_hdac_chip_writel(chip, reg, value) \
-	((chip)->io_ops->reg_writel(value, (chip)->remap_addr + (reg)))
+	snd_hdac_reg_writel(value, (chip)->remap_addr + (reg))
 #define _snd_hdac_chip_readl(chip, reg) \
-	((chip)->io_ops->reg_readl((chip)->remap_addr + (reg)))
+	snd_hdac_reg_readl((chip)->remap_addr + (reg))
 
 /* read/write a register, pass without AZX_REG_ prefix */
 #define snd_hdac_chip_writel(chip, reg, value) \
@@ -548,24 +546,19 @@ int snd_hdac_get_stream_stripe_ctl(struct hdac_bus *bus,
 /*
  * macros for easy use
  */
-#define _snd_hdac_stream_write(type, dev, reg, value)			\
-	((dev)->bus->io_ops->reg_write ## type(value, (dev)->sd_addr + (reg)))
-#define _snd_hdac_stream_read(type, dev, reg)				\
-	((dev)->bus->io_ops->reg_read ## type((dev)->sd_addr + (reg)))
-
 /* read/write a register, pass without AZX_REG_ prefix */
 #define snd_hdac_stream_writel(dev, reg, value) \
-	_snd_hdac_stream_write(l, dev, AZX_REG_ ## reg, value)
+	snd_hdac_reg_writel(value, (dev)->sd_addr + AZX_REG_ ## reg)
 #define snd_hdac_stream_writew(dev, reg, value) \
-	_snd_hdac_stream_write(w, dev, AZX_REG_ ## reg, value)
+	snd_hdac_reg_writew(value, (dev)->sd_addr + AZX_REG_ ## reg)
 #define snd_hdac_stream_writeb(dev, reg, value) \
-	_snd_hdac_stream_write(b, dev, AZX_REG_ ## reg, value)
+	snd_hdac_reg_writeb(value, (dev)->sd_addr + AZX_REG_ ## reg)
 #define snd_hdac_stream_readl(dev, reg) \
-	_snd_hdac_stream_read(l, dev, AZX_REG_ ## reg)
+	snd_hdac_reg_readl((dev)->sd_addr + AZX_REG_ ## reg)
 #define snd_hdac_stream_readw(dev, reg) \
-	_snd_hdac_stream_read(w, dev, AZX_REG_ ## reg)
+	snd_hdac_reg_readw((dev)->sd_addr + AZX_REG_ ## reg)
 #define snd_hdac_stream_readb(dev, reg) \
-	_snd_hdac_stream_read(b, dev, AZX_REG_ ## reg)
+	snd_hdac_reg_readb((dev)->sd_addr + AZX_REG_ ## reg)
 
 /* update a register, pass without AZX_REG_ prefix */
 #define snd_hdac_stream_updatel(dev, reg, mask, val) \
diff --git a/include/sound/hdaudio_ext.h b/include/sound/hdaudio_ext.h
index f34aced69ca8..ef88b20c7b0a 100644
--- a/include/sound/hdaudio_ext.h
+++ b/include/sound/hdaudio_ext.h
@@ -6,7 +6,6 @@
 
 int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
 		      const struct hdac_bus_ops *ops,
-		      const struct hdac_io_ops *io_ops,
 		      const struct hdac_ext_bus_ops *ext_ops);
 
 void snd_hdac_ext_bus_exit(struct hdac_bus *bus);
diff --git a/sound/hda/Kconfig b/sound/hda/Kconfig
index 9ccbcb5a06bd..3d33fc1757ba 100644
--- a/sound/hda/Kconfig
+++ b/sound/hda/Kconfig
@@ -6,6 +6,9 @@ config SND_HDA_CORE
 config SND_HDA_DSP_LOADER
 	bool
 
+config SND_HDA_ALIGNED_MMIO
+	bool
+
 config SND_HDA_COMPONENT
 	bool
 
diff --git a/sound/hda/ext/hdac_ext_bus.c b/sound/hda/ext/hdac_ext_bus.c
index 4f9f1d2a2ec5..242306d820ec 100644
--- a/sound/hda/ext/hdac_ext_bus.c
+++ b/sound/hda/ext/hdac_ext_bus.c
@@ -17,80 +17,22 @@
 MODULE_DESCRIPTION("HDA extended core");
 MODULE_LICENSE("GPL v2");
 
-static void hdac_ext_writel(u32 value, u32 __iomem *addr)
-{
-	writel(value, addr);
-}
-
-static u32 hdac_ext_readl(u32 __iomem *addr)
-{
-	return readl(addr);
-}
-
-static void hdac_ext_writew(u16 value, u16 __iomem *addr)
-{
-	writew(value, addr);
-}
-
-static u16 hdac_ext_readw(u16 __iomem *addr)
-{
-	return readw(addr);
-}
-
-static void hdac_ext_writeb(u8 value, u8 __iomem *addr)
-{
-	writeb(value, addr);
-}
-
-static u8 hdac_ext_readb(u8 __iomem *addr)
-{
-	return readb(addr);
-}
-
-static int hdac_ext_dma_alloc_pages(struct hdac_bus *bus, int type,
-			   size_t size, struct snd_dma_buffer *buf)
-{
-	return snd_dma_alloc_pages(type, bus->dev, size, buf);
-}
-
-static void hdac_ext_dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
-{
-	snd_dma_free_pages(buf);
-}
-
-static const struct hdac_io_ops hdac_ext_default_io = {
-	.reg_writel = hdac_ext_writel,
-	.reg_readl = hdac_ext_readl,
-	.reg_writew = hdac_ext_writew,
-	.reg_readw = hdac_ext_readw,
-	.reg_writeb = hdac_ext_writeb,
-	.reg_readb = hdac_ext_readb,
-	.dma_alloc_pages = hdac_ext_dma_alloc_pages,
-	.dma_free_pages = hdac_ext_dma_free_pages,
-};
-
 /**
  * snd_hdac_ext_bus_init - initialize a HD-audio extended bus
  * @ebus: the pointer to extended bus object
  * @dev: device pointer
  * @ops: bus verb operators
- * @io_ops: lowlevel I/O operators, can be NULL. If NULL core will use
  * default ops
  *
  * Returns 0 if successful, or a negative error code.
  */
 int snd_hdac_ext_bus_init(struct hdac_bus *bus, struct device *dev,
 			const struct hdac_bus_ops *ops,
-			const struct hdac_io_ops *io_ops,
 			const struct hdac_ext_bus_ops *ext_ops)
 {
 	int ret;
 
-	/* check if io ops are provided, if not load the defaults */
-	if (io_ops == NULL)
-		io_ops = &hdac_ext_default_io;
-
-	ret = snd_hdac_bus_init(bus, dev, ops, io_ops);
+	ret = snd_hdac_bus_init(bus, dev, ops);
 	if (ret < 0)
 		return ret;
 
diff --git a/sound/hda/hdac_bus.c b/sound/hda/hdac_bus.c
index 14e57ffd5bc1..dc2523ef7d98 100644
--- a/sound/hda/hdac_bus.c
+++ b/sound/hda/hdac_bus.c
@@ -19,13 +19,11 @@ static const struct hdac_bus_ops default_ops = {
  * snd_hdac_bus_init - initialize a HD-audio bas bus
  * @bus: the pointer to bus object
  * @ops: bus verb operators
- * @io_ops: lowlevel I/O operators
  *
  * Returns 0 if successful, or a negative error code.
  */
 int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
-		      const struct hdac_bus_ops *ops,
-		      const struct hdac_io_ops *io_ops)
+		      const struct hdac_bus_ops *ops)
 {
 	memset(bus, 0, sizeof(*bus));
 	bus->dev = dev;
@@ -33,7 +31,7 @@ int snd_hdac_bus_init(struct hdac_bus *bus, struct device *dev,
 		bus->ops = ops;
 	else
 		bus->ops = &default_ops;
-	bus->io_ops = io_ops;
+	bus->dma_type = SNDRV_DMA_TYPE_DEV;
 	INIT_LIST_HEAD(&bus->stream_list);
 	INIT_LIST_HEAD(&bus->codec_list);
 	INIT_WORK(&bus->unsol_work, snd_hdac_bus_process_unsol_events);
@@ -217,3 +215,33 @@ void snd_hdac_bus_remove_device(struct hdac_bus *bus,
 	flush_work(&bus->unsol_work);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_bus_remove_device);
+
+#ifdef CONFIG_SND_HDA_ALIGNED_MMIO
+/* Helpers for aligned read/write of mmio space, for Tegra */
+unsigned int snd_hdac_aligned_read(void __iomem *addr, unsigned int mask)
+{
+	void __iomem *aligned_addr =
+		(void __iomem *)((unsigned long)(addr) & ~0x3);
+	unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
+	unsigned int v;
+
+	v = readl(aligned_addr);
+	return (v >> shift) & mask;
+}
+EXPORT_SYMBOL_GPL(snd_hdac_aligned_read);
+
+void snd_hdac_aligned_write(unsigned int val, void __iomem *addr,
+			    unsigned int mask)
+{
+	void __iomem *aligned_addr =
+		(void __iomem *)((unsigned long)(addr) & ~0x3);
+	unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
+	unsigned int v;
+
+	v = readl(aligned_addr);
+	v &= ~(mask << shift);
+	v |= val << shift;
+	writel(v, aligned_addr);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_aligned_write);
+#endif /* CONFIG_SND_HDA_ALIGNED_MMIO */
diff --git a/sound/hda/hdac_controller.c b/sound/hda/hdac_controller.c
index 196bbc85699e..d3999e7b0705 100644
--- a/sound/hda/hdac_controller.c
+++ b/sound/hda/hdac_controller.c
@@ -577,12 +577,13 @@ int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus)
 {
 	struct hdac_stream *s;
 	int num_streams = 0;
+	int dma_type = bus->dma_type ? bus->dma_type : SNDRV_DMA_TYPE_DEV;
 	int err;
 
 	list_for_each_entry(s, &bus->stream_list, list) {
 		/* allocate memory for the BDL for each stream */
-		err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
-						   BDL_SIZE, &s->bdl);
+		err = snd_dma_alloc_pages(dma_type, bus->dev,
+					  BDL_SIZE, &s->bdl);
 		num_streams++;
 		if (err < 0)
 			return -ENOMEM;
@@ -591,16 +592,15 @@ int snd_hdac_bus_alloc_stream_pages(struct hdac_bus *bus)
 	if (WARN_ON(!num_streams))
 		return -EINVAL;
 	/* allocate memory for the position buffer */
-	err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
-					   num_streams * 8, &bus->posbuf);
+	err = snd_dma_alloc_pages(dma_type, bus->dev,
+				  num_streams * 8, &bus->posbuf);
 	if (err < 0)
 		return -ENOMEM;
 	list_for_each_entry(s, &bus->stream_list, list)
 		s->posbuf = (__le32 *)(bus->posbuf.area + s->index * 8);
 
 	/* single page (at least 4096 bytes) must suffice for both ringbuffes */
-	return bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV,
-					    PAGE_SIZE, &bus->rb);
+	return snd_dma_alloc_pages(dma_type, bus->dev, PAGE_SIZE, &bus->rb);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_bus_alloc_stream_pages);
 
@@ -614,12 +614,12 @@ void snd_hdac_bus_free_stream_pages(struct hdac_bus *bus)
 
 	list_for_each_entry(s, &bus->stream_list, list) {
 		if (s->bdl.area)
-			bus->io_ops->dma_free_pages(bus, &s->bdl);
+			snd_dma_free_pages(&s->bdl);
 	}
 
 	if (bus->rb.area)
-		bus->io_ops->dma_free_pages(bus, &bus->rb);
+		snd_dma_free_pages(&bus->rb);
 	if (bus->posbuf.area)
-		bus->io_ops->dma_free_pages(bus, &bus->posbuf);
+		snd_dma_free_pages(&bus->posbuf);
 }
 EXPORT_SYMBOL_GPL(snd_hdac_bus_free_stream_pages);
diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c
index 55d53b89ac21..fc68d4ce0a37 100644
--- a/sound/hda/hdac_stream.c
+++ b/sound/hda/hdac_stream.c
@@ -680,8 +680,8 @@ int snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
 	azx_dev->locked = true;
 	spin_unlock_irq(&bus->reg_lock);
 
-	err = bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV_SG,
-					   byte_size, bufp);
+	err = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV_SG, bus->dev,
+				  byte_size, bufp);
 	if (err < 0)
 		goto err_alloc;
 
@@ -707,7 +707,7 @@ int snd_hdac_dsp_prepare(struct hdac_stream *azx_dev, unsigned int format,
 	return azx_dev->stream_tag;
 
  error:
-	bus->io_ops->dma_free_pages(bus, bufp);
+	snd_dma_free_pages(bufp);
  err_alloc:
 	spin_lock_irq(&bus->reg_lock);
 	azx_dev->locked = false;
@@ -754,7 +754,7 @@ void snd_hdac_dsp_cleanup(struct hdac_stream *azx_dev,
 	azx_dev->period_bytes = 0;
 	azx_dev->format_val = 0;
 
-	bus->io_ops->dma_free_pages(bus, dmab);
+	snd_dma_free_pages(dmab);
 	dmab->area = NULL;
 
 	spin_lock_irq(&bus->reg_lock);
diff --git a/sound/pci/hda/Kconfig b/sound/pci/hda/Kconfig
index b5966014b5f7..dae47a45b2b8 100644
--- a/sound/pci/hda/Kconfig
+++ b/sound/pci/hda/Kconfig
@@ -36,6 +36,7 @@ config SND_HDA_TEGRA
 	tristate "NVIDIA Tegra HD Audio"
 	depends on ARCH_TEGRA
 	select SND_HDA
+	select SND_HDA_ALIGNED_MMIO
 	help
 	  Say Y here to support the HDA controller present in NVIDIA
 	  Tegra SoCs
diff --git a/sound/pci/hda/hda_controller.c b/sound/pci/hda/hda_controller.c
index 4b4cb0fd5102..156930d0c9d3 100644
--- a/sound/pci/hda/hda_controller.c
+++ b/sound/pci/hda/hda_controller.c
@@ -1205,14 +1205,12 @@ void snd_hda_bus_reset(struct hda_bus *bus)
 }
 
 /* HD-audio bus initialization */
-int azx_bus_init(struct azx *chip, const char *model,
-		 const struct hdac_io_ops *io_ops)
+int azx_bus_init(struct azx *chip, const char *model)
 {
 	struct hda_bus *bus = &chip->bus;
 	int err;
 
-	err = snd_hdac_bus_init(&bus->core, chip->card->dev, &bus_core_ops,
-				io_ops);
+	err = snd_hdac_bus_init(&bus->core, chip->card->dev, &bus_core_ops);
 	if (err < 0)
 		return err;
 
diff --git a/sound/pci/hda/hda_controller.h b/sound/pci/hda/hda_controller.h
index baa15374fbcb..146a71e0d594 100644
--- a/sound/pci/hda/hda_controller.h
+++ b/sound/pci/hda/hda_controller.h
@@ -206,8 +206,7 @@ void azx_stop_chip(struct azx *chip);
 irqreturn_t azx_interrupt(int irq, void *dev_id);
 
 /* Codec interface */
-int azx_bus_init(struct azx *chip, const char *model,
-		 const struct hdac_io_ops *io_ops);
+int azx_bus_init(struct azx *chip, const char *model);
 int azx_probe_codecs(struct azx *chip, unsigned int max_slots);
 int azx_codec_configure(struct azx *chip);
 int azx_init_streams(struct azx *chip);
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 2af1e0868e55..3a209e07d5d8 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1632,7 +1632,6 @@ static int default_bdl_pos_adj(struct azx *chip)
 /*
  * constructor
  */
-static const struct hdac_io_ops pci_hda_io_ops;
 static const struct hda_controller_ops pci_hda_ops;
 
 static int azx_create(struct snd_card *card, struct pci_dev *pci,
@@ -1692,13 +1691,17 @@ static int azx_create(struct snd_card *card, struct pci_dev *pci,
 	else
 		chip->bdl_pos_adj = bdl_pos_adj[dev];
 
-	err = azx_bus_init(chip, model[dev], &pci_hda_io_ops);
+	err = azx_bus_init(chip, model[dev]);
 	if (err < 0) {
 		kfree(hda);
 		pci_disable_device(pci);
 		return err;
 	}
 
+	/* use the non-cached pages in non-snoop mode */
+	if (!azx_snoop(chip))
+		azx_bus(chip)->dma_type = SNDRV_DMA_TYPE_DEV_UC;
+
 	/* Workaround for a communication error on CFL (bko#199007) and CNL */
 	if (IS_CFL(pci) || IS_CNL(pci))
 		azx_bus(chip)->polling_mode = 1;
@@ -1933,41 +1936,6 @@ static void azx_firmware_cb(const struct firmware *fw, void *context)
 }
 #endif
 
-/*
- * HDA controller ops.
- */
-
-/* PCI register access. */
-static void pci_azx_writel(u32 value, u32 __iomem *addr)
-{
-	writel(value, addr);
-}
-
-static u32 pci_azx_readl(u32 __iomem *addr)
-{
-	return readl(addr);
-}
-
-static void pci_azx_writew(u16 value, u16 __iomem *addr)
-{
-	writew(value, addr);
-}
-
-static u16 pci_azx_readw(u16 __iomem *addr)
-{
-	return readw(addr);
-}
-
-static void pci_azx_writeb(u8 value, u8 __iomem *addr)
-{
-	writeb(value, addr);
-}
-
-static u8 pci_azx_readb(u8 __iomem *addr)
-{
-	return readb(addr);
-}
-
 static int disable_msi_reset_irq(struct azx *chip)
 {
 	struct hdac_bus *bus = azx_bus(chip);
@@ -1984,24 +1952,6 @@ static int disable_msi_reset_irq(struct azx *chip)
 	return 0;
 }
 
-/* DMA page allocation helpers.  */
-static int dma_alloc_pages(struct hdac_bus *bus,
-			   int type,
-			   size_t size,
-			   struct snd_dma_buffer *buf)
-{
-	struct azx *chip = bus_to_azx(bus);
-
-	if (!azx_snoop(chip) && type == SNDRV_DMA_TYPE_DEV)
-		type = SNDRV_DMA_TYPE_DEV_UC;
-	return snd_dma_alloc_pages(type, bus->dev, size, buf);
-}
-
-static void dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
-{
-	snd_dma_free_pages(buf);
-}
-
 static void pcm_mmap_prepare(struct snd_pcm_substream *substream,
 			     struct vm_area_struct *area)
 {
@@ -2013,17 +1963,6 @@ static void pcm_mmap_prepare(struct snd_pcm_substream *substream,
 #endif
 }
 
-static const struct hdac_io_ops pci_hda_io_ops = {
-	.reg_writel = pci_azx_writel,
-	.reg_readl = pci_azx_readl,
-	.reg_writew = pci_azx_writew,
-	.reg_readw = pci_azx_readw,
-	.reg_writeb = pci_azx_writeb,
-	.reg_readb = pci_azx_readb,
-	.dma_alloc_pages = dma_alloc_pages,
-	.dma_free_pages = dma_free_pages,
-};
-
 static const struct hda_controller_ops pci_hda_ops = {
 	.disable_msi_reset_irq = disable_msi_reset_irq,
 	.pcm_mmap_prepare = pcm_mmap_prepare,
diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
index 7dbe9f39fc79..8350954b7986 100644
--- a/sound/pci/hda/hda_tegra.c
+++ b/sound/pci/hda/hda_tegra.c
@@ -75,88 +75,6 @@ MODULE_PARM_DESC(power_save,
 #define power_save	0
 #endif
 
-/*
- * DMA page allocation ops.
- */
-static int dma_alloc_pages(struct hdac_bus *bus, int type, size_t size,
-			   struct snd_dma_buffer *buf)
-{
-	return snd_dma_alloc_pages(type, bus->dev, size, buf);
-}
-
-static void dma_free_pages(struct hdac_bus *bus, struct snd_dma_buffer *buf)
-{
-	snd_dma_free_pages(buf);
-}
-
-/*
- * Register access ops. Tegra HDA register access is DWORD only.
- */
-static void hda_tegra_writel(u32 value, u32 __iomem *addr)
-{
-	writel(value, addr);
-}
-
-static u32 hda_tegra_readl(u32 __iomem *addr)
-{
-	return readl(addr);
-}
-
-static void hda_tegra_writew(u16 value, u16 __iomem  *addr)
-{
-	unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
-	void __iomem *dword_addr = (void __iomem *)((unsigned long)(addr) & ~0x3);
-	u32 v;
-
-	v = readl(dword_addr);
-	v &= ~(0xffff << shift);
-	v |= value << shift;
-	writel(v, dword_addr);
-}
-
-static u16 hda_tegra_readw(u16 __iomem *addr)
-{
-	unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
-	void __iomem *dword_addr = (void __iomem *)((unsigned long)(addr) & ~0x3);
-	u32 v;
-
-	v = readl(dword_addr);
-	return (v >> shift) & 0xffff;
-}
-
-static void hda_tegra_writeb(u8 value, u8 __iomem *addr)
-{
-	unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
-	void __iomem *dword_addr = (void __iomem *)((unsigned long)(addr) & ~0x3);
-	u32 v;
-
-	v = readl(dword_addr);
-	v &= ~(0xff << shift);
-	v |= value << shift;
-	writel(v, dword_addr);
-}
-
-static u8 hda_tegra_readb(u8 __iomem *addr)
-{
-	unsigned int shift = ((unsigned long)(addr) & 0x3) << 3;
-	void __iomem *dword_addr = (void __iomem *)((unsigned long)(addr) & ~0x3);
-	u32 v;
-
-	v = readl(dword_addr);
-	return (v >> shift) & 0xff;
-}
-
-static const struct hdac_io_ops hda_tegra_io_ops = {
-	.reg_writel = hda_tegra_writel,
-	.reg_readl = hda_tegra_readl,
-	.reg_writew = hda_tegra_writew,
-	.reg_readw = hda_tegra_readw,
-	.reg_writeb = hda_tegra_writeb,
-	.reg_readb = hda_tegra_readb,
-	.dma_alloc_pages = dma_alloc_pages,
-	.dma_free_pages = dma_free_pages,
-};
-
 static const struct hda_controller_ops hda_tegra_ops; /* nothing special */
 
 static void hda_tegra_init(struct hda_tegra *hda)
@@ -475,7 +393,7 @@ static int hda_tegra_create(struct snd_card *card,
 
 	INIT_WORK(&hda->probe_work, hda_tegra_probe_work);
 
-	err = azx_bus_init(chip, NULL, &hda_tegra_io_ops);
+	err = azx_bus_init(chip, NULL);
 	if (err < 0)
 		return err;
 
diff --git a/sound/soc/intel/skylake/skl-messages.c b/sound/soc/intel/skylake/skl-messages.c
index febc070839e0..c6f9e05c929e 100644
--- a/sound/soc/intel/skylake/skl-messages.c
+++ b/sound/soc/intel/skylake/skl-messages.c
@@ -25,23 +25,12 @@
 static int skl_alloc_dma_buf(struct device *dev,
 		struct snd_dma_buffer *dmab, size_t size)
 {
-	struct hdac_bus *bus = dev_get_drvdata(dev);
-
-	if (!bus)
-		return -ENODEV;
-
-	return  bus->io_ops->dma_alloc_pages(bus, SNDRV_DMA_TYPE_DEV, size, dmab);
+	return snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, dev, size, dmab);
 }
 
 static int skl_free_dma_buf(struct device *dev, struct snd_dma_buffer *dmab)
 {
-	struct hdac_bus *bus = dev_get_drvdata(dev);
-
-	if (!bus)
-		return -ENODEV;
-
-	bus->io_ops->dma_free_pages(bus, dmab);
-
+	snd_dma_free_pages(dmab);
 	return 0;
 }
 
diff --git a/sound/soc/intel/skylake/skl.c b/sound/soc/intel/skylake/skl.c
index 2b5159890a57..239348b0596b 100644
--- a/sound/soc/intel/skylake/skl.c
+++ b/sound/soc/intel/skylake/skl.c
@@ -134,7 +134,7 @@ static int skl_init_chip(struct hdac_bus *bus, bool full_reset)
 
 	/* Reset stream-to-link mapping */
 	list_for_each_entry(hlink, &bus->hlink_list, list)
-		bus->io_ops->reg_writel(0, hlink->ml_addr + AZX_REG_ML_LOSIDV);
+		writel(0, hlink->ml_addr + AZX_REG_ML_LOSIDV);
 
 	skl_enable_miscbdcge(bus->dev, true);
 
@@ -858,7 +858,6 @@ static void skl_probe_work(struct work_struct *work)
  * constructor
  */
 static int skl_create(struct pci_dev *pci,
-		      const struct hdac_io_ops *io_ops,
 		      struct skl **rskl)
 {
 	struct hdac_ext_bus_ops *ext_ops = NULL;
@@ -888,7 +887,7 @@ static int skl_create(struct pci_dev *pci,
 #if IS_ENABLED(CONFIG_SND_SOC_INTEL_SKYLAKE_HDAUDIO_CODEC)
 	ext_ops = snd_soc_hdac_hda_get_ops();
 #endif
-	snd_hdac_ext_bus_init(bus, &pci->dev, &bus_core_ops, io_ops, ext_ops);
+	snd_hdac_ext_bus_init(bus, &pci->dev, &bus_core_ops, ext_ops);
 	bus->use_posbuf = 1;
 	skl->pci = pci;
 	INIT_WORK(&skl->probe_work, skl_probe_work);
@@ -1017,7 +1016,7 @@ static int skl_probe(struct pci_dev *pci,
 	}
 
 	/* we use ext core ops, so provide NULL for ops here */
-	err = skl_create(pci, NULL, &skl);
+	err = skl_create(pci, &skl);
 	if (err < 0)
 		return err;
 
diff --git a/sound/soc/sof/intel/hda-bus.c b/sound/soc/sof/intel/hda-bus.c
index a7e6d8227df6..0caec3a070d3 100644
--- a/sound/soc/sof/intel/hda-bus.c
+++ b/sound/soc/sof/intel/hda-bus.c
@@ -12,82 +12,26 @@
 #include "../sof-priv.h"
 #include "hda.h"
 
-#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
-
-static const struct hdac_bus_ops bus_ops = {
-	.command = snd_hdac_bus_send_cmd,
-	.get_response = snd_hdac_bus_get_response,
-};
-
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
+#define sof_hda_ext_ops	snd_soc_hdac_hda_get_ops()
+#else
+#define sof_hda_ext_ops	NULL
 #endif
 
-static void sof_hda_writel(u32 value, u32 __iomem *addr)
-{
-	writel(value, addr);
-}
-
-static u32 sof_hda_readl(u32 __iomem *addr)
-{
-	return readl(addr);
-}
-
-static void sof_hda_writew(u16 value, u16 __iomem *addr)
-{
-	writew(value, addr);
-}
-
-static u16 sof_hda_readw(u16 __iomem *addr)
-{
-	return readw(addr);
-}
-
-static void sof_hda_writeb(u8 value, u8 __iomem *addr)
-{
-	writeb(value, addr);
-}
-
-static u8 sof_hda_readb(u8 __iomem *addr)
-{
-	return readb(addr);
-}
-
-static int sof_hda_dma_alloc_pages(struct hdac_bus *bus, int type,
-				   size_t size, struct snd_dma_buffer *buf)
-{
-	return snd_dma_alloc_pages(type, bus->dev, size, buf);
-}
-
-static void sof_hda_dma_free_pages(struct hdac_bus *bus,
-				   struct snd_dma_buffer *buf)
-{
-	snd_dma_free_pages(buf);
-}
-
-static const struct hdac_io_ops io_ops = {
-	.reg_writel = sof_hda_writel,
-	.reg_readl = sof_hda_readl,
-	.reg_writew = sof_hda_writew,
-	.reg_readw = sof_hda_readw,
-	.reg_writeb = sof_hda_writeb,
-	.reg_readb = sof_hda_readb,
-	.dma_alloc_pages = sof_hda_dma_alloc_pages,
-	.dma_free_pages = sof_hda_dma_free_pages,
-};
-
 /*
  * This can be used for both with/without hda link support.
  */
-void sof_hda_bus_init(struct hdac_bus *bus, struct device *dev,
-		      const struct hdac_ext_bus_ops *ext_ops)
+void sof_hda_bus_init(struct hdac_bus *bus, struct device *dev)
 {
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
+	snd_hdac_ext_bus_init(bus, dev, NULL, sof_hda_ext_ops);
+#else /* CONFIG_SND_SOC_SOF_HDA */
 	memset(bus, 0, sizeof(*bus));
 	bus->dev = dev;
 
-	bus->io_ops = &io_ops;
 	INIT_LIST_HEAD(&bus->stream_list);
 
 	bus->irq = -1;
-	bus->ext_ops = ext_ops;
 
 	/*
 	 * There is only one HDA bus atm. keep the index as 0.
@@ -96,16 +40,5 @@ void sof_hda_bus_init(struct hdac_bus *bus, struct device *dev,
 	bus->idx = 0;
 
 	spin_lock_init(&bus->reg_lock);
-
-#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
-	INIT_LIST_HEAD(&bus->codec_list);
-	INIT_LIST_HEAD(&bus->hlink_list);
-
-	mutex_init(&bus->cmd_mutex);
-	mutex_init(&bus->lock);
-	bus->ops = &bus_ops;
-	INIT_WORK(&bus->unsol_work, snd_hdac_bus_process_unsol_events);
-	bus->cmd_dma_state = true;
-#endif
-
+#endif /* CONFIG_SND_SOC_SOF_HDA */
 }
diff --git a/sound/soc/sof/intel/hda-dsp.c b/sound/soc/sof/intel/hda-dsp.c
index 91de4785b6a3..8d4ce5b4febd 100644
--- a/sound/soc/sof/intel/hda-dsp.c
+++ b/sound/soc/sof/intel/hda-dsp.c
@@ -356,7 +356,7 @@ static int hda_resume(struct snd_sof_dev *sdev)
 
 	/* Reset stream-to-link mapping */
 	list_for_each_entry(hlink, &bus->hlink_list, list)
-		bus->io_ops->reg_writel(0, hlink->ml_addr + AZX_REG_ML_LOSIDV);
+		writel(0, hlink->ml_addr + AZX_REG_ML_LOSIDV);
 
 	hda_dsp_ctrl_misc_clock_gating(sdev, true);
 #else
diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c
index 7f665392618f..7ca27000c34d 100644
--- a/sound/soc/sof/intel/hda.c
+++ b/sound/soc/sof/intel/hda.c
@@ -236,7 +236,6 @@ static int hda_init(struct snd_sof_dev *sdev)
 {
 	struct hda_bus *hbus;
 	struct hdac_bus *bus;
-	struct hdac_ext_bus_ops *ext_ops = NULL;
 	struct pci_dev *pci = to_pci_dev(sdev->dev);
 	int ret;
 
@@ -244,10 +243,7 @@ static int hda_init(struct snd_sof_dev *sdev)
 	bus = sof_to_bus(sdev);
 
 	/* HDA bus init */
-#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
-	ext_ops = snd_soc_hdac_hda_get_ops();
-#endif
-	sof_hda_bus_init(bus, &pci->dev, ext_ops);
+	sof_hda_bus_init(bus, &pci->dev);
 
 	/* Workaround for a communication error on CFL (bko#199007) and CNL */
 	if (IS_CFL(pci) || IS_CNL(pci))
diff --git a/sound/soc/sof/intel/hda.h b/sound/soc/sof/intel/hda.h
index d9c17146200b..75b096050fa2 100644
--- a/sound/soc/sof/intel/hda.h
+++ b/sound/soc/sof/intel/hda.h
@@ -549,8 +549,7 @@ void hda_dsp_ctrl_stop_chip(struct snd_sof_dev *sdev);
 /*
  * HDA bus operations.
  */
-void sof_hda_bus_init(struct hdac_bus *bus, struct device *dev,
-		      const struct hdac_ext_bus_ops *ext_ops);
+void sof_hda_bus_init(struct hdac_bus *bus, struct device *dev);
 
 #if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA)
 /*