diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index ddf79ef0ccee..ef17c4f0d560 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -876,8 +876,6 @@ struct amdgpu_device {
 	spinlock_t audio_endpt_idx_lock;
 	amdgpu_block_rreg_t		audio_endpt_rreg;
 	amdgpu_block_wreg_t		audio_endpt_wreg;
-	void __iomem                    *rio_mem;
-	resource_size_t			rio_mem_size;
 	struct amdgpu_doorbell		doorbell;
 
 	/* clock/pll info */
@@ -1113,9 +1111,6 @@ void amdgpu_mm_wreg_mmio_rlc(struct amdgpu_device *adev,
 void amdgpu_mm_wreg8(struct amdgpu_device *adev, uint32_t offset, uint8_t value);
 uint8_t amdgpu_mm_rreg8(struct amdgpu_device *adev, uint32_t offset);
 
-u32 amdgpu_io_rreg(struct amdgpu_device *adev, u32 reg);
-void amdgpu_io_wreg(struct amdgpu_device *adev, u32 reg, u32 v);
-
 u32 amdgpu_device_indirect_rreg(struct amdgpu_device *adev,
 				u32 pcie_index, u32 pcie_data,
 				u32 reg_addr);
@@ -1206,8 +1201,6 @@ int emu_soc_asic_init(struct amdgpu_device *adev);
 	} while (0)
 
 #define DREG32_SYS(sqf, adev, reg) seq_printf((sqf), #reg " : 0x%08X\n", amdgpu_device_rreg((adev), (reg), false))
-#define RREG32_IO(reg) amdgpu_io_rreg(adev, (reg))
-#define WREG32_IO(reg, v) amdgpu_io_wreg(adev, (reg), (v))
 
 #define REG_FIELD_SHIFT(reg, field) reg##__##field##__SHIFT
 #define REG_FIELD_MASK(reg, field) reg##__##field##_MASK
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
index 86add0f4ea4d..e05648a8a145 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atombios.c
@@ -1905,40 +1905,6 @@ static uint32_t cail_reg_read(struct card_info *info, uint32_t reg)
 	return r;
 }
 
-/**
- * cail_ioreg_write - write IO register
- *
- * @info: atom card_info pointer
- * @reg: IO register offset
- * @val: value to write to the pll register
- *
- * Provides a IO register accessor for the atom interpreter (r4xx+).
- */
-static void cail_ioreg_write(struct card_info *info, uint32_t reg, uint32_t val)
-{
-	struct amdgpu_device *adev = drm_to_adev(info->dev);
-
-	WREG32_IO(reg, val);
-}
-
-/**
- * cail_ioreg_read - read IO register
- *
- * @info: atom card_info pointer
- * @reg: IO register offset
- *
- * Provides an IO register accessor for the atom interpreter (r4xx+).
- * Returns the value of the IO register.
- */
-static uint32_t cail_ioreg_read(struct card_info *info, uint32_t reg)
-{
-	struct amdgpu_device *adev = drm_to_adev(info->dev);
-	uint32_t r;
-
-	r = RREG32_IO(reg);
-	return r;
-}
-
 static ssize_t amdgpu_atombios_get_vbios_version(struct device *dev,
 						 struct device_attribute *attr,
 						 char *buf)
@@ -1998,15 +1964,6 @@ int amdgpu_atombios_init(struct amdgpu_device *adev)
 	atom_card_info->dev = adev_to_drm(adev);
 	atom_card_info->reg_read = cail_reg_read;
 	atom_card_info->reg_write = cail_reg_write;
-	/* needed for iio ops */
-	if (adev->rio_mem) {
-		atom_card_info->ioreg_read = cail_ioreg_read;
-		atom_card_info->ioreg_write = cail_ioreg_write;
-	} else {
-		DRM_DEBUG("PCI I/O BAR is not found. Using MMIO to access ATOM BIOS\n");
-		atom_card_info->ioreg_read = cail_reg_read;
-		atom_card_info->ioreg_write = cail_reg_write;
-	}
 	atom_card_info->mc_read = cail_mc_read;
 	atom_card_info->mc_write = cail_mc_write;
 	atom_card_info->pll_read = cail_pll_read;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index f04680d50856..9b022bac6708 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -465,49 +465,6 @@ void amdgpu_mm_wreg_mmio_rlc(struct amdgpu_device *adev,
 	}
 }
 
-/**
- * amdgpu_io_rreg - read an IO register
- *
- * @adev: amdgpu_device pointer
- * @reg: dword aligned register offset
- *
- * Returns the 32 bit value from the offset specified.
- */
-u32 amdgpu_io_rreg(struct amdgpu_device *adev, u32 reg)
-{
-	if (adev->in_pci_err_recovery)
-		return 0;
-
-	if ((reg * 4) < adev->rio_mem_size)
-		return ioread32(adev->rio_mem + (reg * 4));
-	else {
-		iowrite32((reg * 4), adev->rio_mem + (mmMM_INDEX * 4));
-		return ioread32(adev->rio_mem + (mmMM_DATA * 4));
-	}
-}
-
-/**
- * amdgpu_io_wreg - write to an IO register
- *
- * @adev: amdgpu_device pointer
- * @reg: dword aligned register offset
- * @v: 32 bit value to write to the register
- *
- * Writes the value specified to the offset specified.
- */
-void amdgpu_io_wreg(struct amdgpu_device *adev, u32 reg, u32 v)
-{
-	if (adev->in_pci_err_recovery)
-		return;
-
-	if ((reg * 4) < adev->rio_mem_size)
-		iowrite32(v, adev->rio_mem + (reg * 4));
-	else {
-		iowrite32((reg * 4), adev->rio_mem + (mmMM_INDEX * 4));
-		iowrite32(v, adev->rio_mem + (mmMM_DATA * 4));
-	}
-}
-
 /**
  * amdgpu_mm_rdoorbell - read a doorbell dword
  *
@@ -3356,17 +3313,6 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 	DRM_INFO("register mmio base: 0x%08X\n", (uint32_t)adev->rmmio_base);
 	DRM_INFO("register mmio size: %u\n", (unsigned)adev->rmmio_size);
 
-	/* io port mapping */
-	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
-		if (pci_resource_flags(adev->pdev, i) & IORESOURCE_IO) {
-			adev->rio_mem_size = pci_resource_len(adev->pdev, i);
-			adev->rio_mem = pci_iomap(adev->pdev, i, adev->rio_mem_size);
-			break;
-		}
-	}
-	if (adev->rio_mem == NULL)
-		DRM_INFO("PCI I/O BAR is not found.\n");
-
 	/* enable PCIE atomic ops */
 	r = pci_enable_atomic_ops_to_root(adev->pdev,
 					  PCI_EXP_DEVCAP2_ATOMIC_COMP32 |
@@ -3698,9 +3644,6 @@ void amdgpu_device_fini(struct amdgpu_device *adev)
 		vga_switcheroo_fini_domain_pm_ops(adev->dev);
 	if ((adev->pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
 		vga_client_register(adev->pdev, NULL, NULL, NULL);
-	if (adev->rio_mem)
-		pci_iounmap(adev->pdev, adev->rio_mem);
-	adev->rio_mem = NULL;
 	iounmap(adev->rmmio);
 	adev->rmmio = NULL;
 	amdgpu_device_doorbell_fini(adev);
diff --git a/drivers/gpu/drm/amd/amdgpu/atom.c b/drivers/gpu/drm/amd/amdgpu/atom.c
index 515890f4f5a0..3dcb8b32f48b 100644
--- a/drivers/gpu/drm/amd/amdgpu/atom.c
+++ b/drivers/gpu/drm/amd/amdgpu/atom.c
@@ -114,11 +114,11 @@ static uint32_t atom_iio_execute(struct atom_context *ctx, int base,
 			base++;
 			break;
 		case ATOM_IIO_READ:
-			temp = ctx->card->ioreg_read(ctx->card, CU16(base + 1));
+			temp = ctx->card->reg_read(ctx->card, CU16(base + 1));
 			base += 3;
 			break;
 		case ATOM_IIO_WRITE:
-			ctx->card->ioreg_write(ctx->card, CU16(base + 1), temp);
+			ctx->card->reg_write(ctx->card, CU16(base + 1), temp);
 			base += 3;
 			break;
 		case ATOM_IIO_CLEAR:
diff --git a/drivers/gpu/drm/amd/amdgpu/atom.h b/drivers/gpu/drm/amd/amdgpu/atom.h
index 4205bbe5d8d7..d279759cab47 100644
--- a/drivers/gpu/drm/amd/amdgpu/atom.h
+++ b/drivers/gpu/drm/amd/amdgpu/atom.h
@@ -116,8 +116,6 @@ struct card_info {
 	struct drm_device *dev;
 	void (* reg_write)(struct card_info *, uint32_t, uint32_t);   /*  filled by driver */
 	uint32_t (* reg_read)(struct card_info *, uint32_t);          /*  filled by driver */
-	void (* ioreg_write)(struct card_info *, uint32_t, uint32_t);   /*  filled by driver */
-	uint32_t (* ioreg_read)(struct card_info *, uint32_t);          /*  filled by driver */
 	void (* mc_write)(struct card_info *, uint32_t, uint32_t);   /*  filled by driver */
 	uint32_t (* mc_read)(struct card_info *, uint32_t);          /*  filled by driver */
 	void (* pll_write)(struct card_info *, uint32_t, uint32_t);   /*  filled by driver */