drm/amdgpu: drop legacy IO bar support

It was leftover from radeon where it was required for some
specific old hardware.  It hasn't been required for ages
and the driver already falls back to MMIO when legacy IO
is not available.  Legacy IO also seems to be problematic on
on some thunderbolt devices.  Drop it.
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Nicholas Johnson <nicholas.johnson-opensource@outlook.com.au>

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

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;

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);

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:

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 */