drivers/gpu/drm/nouveau/nvkm/subdev/pci/gk104.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/pci/gk104.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/pci/gk104.c
Extension
.c
Size
5863 bytes
Lines
229
Domain
Driver Families
Bucket
drivers/gpu
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

switch (speed2) {
		case 0x00000:
		case 0x10000:
			return NVKM_PCIE_SPEED_2_5;
		case 0x20000:
			return NVKM_PCIE_SPEED_5_0;
		case 0x30000:
			return NVKM_PCIE_SPEED_8_0;
		}
	}

	return -EINVAL;
}

static void
gk104_pcie_set_lnkctl_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)
{
	u8 reg_v = 0;
	switch (speed) {
	case NVKM_PCIE_SPEED_2_5:
		reg_v = 1;
		break;
	case NVKM_PCIE_SPEED_5_0:
		reg_v = 2;
		break;
	case NVKM_PCIE_SPEED_8_0:
		reg_v = 3;
		break;
	}
	nvkm_pci_mask(pci, 0xa8, 0x3, reg_v);
}

static enum nvkm_pcie_speed
gk104_pcie_lnkctl_speed(struct nvkm_pci *pci)
{
	u8 reg_v = nvkm_pci_rd32(pci, 0xa8) & 0x3;
	switch (reg_v) {
	case 0:
	case 1:
		return NVKM_PCIE_SPEED_2_5;
	case 2:
		return NVKM_PCIE_SPEED_5_0;
	case 3:
		return NVKM_PCIE_SPEED_8_0;
	}
	return -1;
}

static enum nvkm_pcie_speed
gk104_pcie_max_speed(struct nvkm_pci *pci)
{
	u32 max_speed = nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x300000;
	switch (max_speed) {
	case 0x000000:
		return NVKM_PCIE_SPEED_8_0;
	case 0x100000:
		return NVKM_PCIE_SPEED_5_0;
	case 0x200000:
		return NVKM_PCIE_SPEED_2_5;
	}
	return NVKM_PCIE_SPEED_2_5;
}

static void
gk104_pcie_set_link_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)
{
	struct nvkm_device *device = pci->subdev.device;
	u32 mask_value;

	switch (speed) {
	case NVKM_PCIE_SPEED_8_0:
		mask_value = 0x00000;
		break;
	case NVKM_PCIE_SPEED_5_0:
		mask_value = 0x40000;
		break;
	case NVKM_PCIE_SPEED_2_5:
	default:
		mask_value = 0x80000;
		break;
	}

	nvkm_mask(device, 0x8c040, 0xc0000, mask_value);
	nvkm_mask(device, 0x8c040, 0x1, 0x1);
}

static int
gk104_pcie_init(struct nvkm_pci * pci)
{
	enum nvkm_pcie_speed lnkctl_speed, max_speed, cap_speed;

Annotation

Implementation Notes