drivers/gpu/drm/nouveau/nvkm/subdev/bios/M0205.c

File Facts

System

Linux kernel

Corpus path

drivers/gpu/drm/nouveau/nvkm/subdev/bios/M0205.c

Extension

.c

Size

3626 bytes

Lines

136

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.

• 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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• subdev/bios.h
• subdev/bios/bit.h
• subdev/bios/M0205.h

Detected Declarations

• function files
• function nvbios_M0205Tp
• function nvbios_M0205Ee
• function nvbios_M0205Ep
• function nvbios_M0205Se
• function nvbios_M0205Sp

Annotated Snippet

if (data) {
			*ver = nvbios_rd08(bios, data + 0x00);
			switch (*ver) {
			case 0x10:
				*hdr = nvbios_rd08(bios, data + 0x01);
				*len = nvbios_rd08(bios, data + 0x02);
				*ssz = nvbios_rd08(bios, data + 0x03);
				*snr = nvbios_rd08(bios, data + 0x04);
				*cnt = nvbios_rd08(bios, data + 0x05);
				return data;
			default:
				break;
			}
		}
	}

	return 0x00000000;
}

u32
nvbios_M0205Tp(struct nvkm_bios *bios,
	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len, u8 *snr, u8 *ssz,
	       struct nvbios_M0205T *info)
{
	u32 data = nvbios_M0205Te(bios, ver, hdr, cnt, len, snr, ssz);
	memset(info, 0x00, sizeof(*info));
	switch (!!data * *ver) {
	case 0x10:
		info->freq = nvbios_rd16(bios, data + 0x06);
		break;
	default:
		break;
	}
	return data;
}

u32
nvbios_M0205Ee(struct nvkm_bios *bios, int idx,
	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
{
	u8  snr, ssz;
	u32 data = nvbios_M0205Te(bios, ver, hdr, cnt, len, &snr, &ssz);
	if (data && idx < *cnt) {
		data = data + *hdr + idx * (*len + (snr * ssz));
		*hdr = *len;
		*cnt = snr;
		*len = ssz;
		return data;
	}
	return 0x00000000;
}

u32
nvbios_M0205Ep(struct nvkm_bios *bios, int idx,
	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len,
	       struct nvbios_M0205E *info)
{
	u32 data = nvbios_M0205Ee(bios, idx, ver, hdr, cnt, len);
	memset(info, 0x00, sizeof(*info));
	switch (!!data * *ver) {
	case 0x10:
		info->type = nvbios_rd08(bios, data + 0x00) & 0x0f;
		return data;
	default:
		break;
	}
	return 0x00000000;
}

u32
nvbios_M0205Se(struct nvkm_bios *bios, int ent, int idx, u8 *ver, u8 *hdr)
{

	u8  cnt, len;
	u32 data = nvbios_M0205Ee(bios, ent, ver, hdr, &cnt, &len);
	if (data && idx < cnt) {
		data = data + *hdr + idx * len;
		*hdr = len;
		return data;
	}
	return 0x00000000;
}

u32
nvbios_M0205Sp(struct nvkm_bios *bios, int ent, int idx, u8 *ver, u8 *hdr,
	       struct nvbios_M0205S *info)
{
	u32 data = nvbios_M0205Se(bios, ent, idx, ver, hdr);
	memset(info, 0x00, sizeof(*info));
	switch (!!data * *ver) {

Annotation

• Immediate include surface: `subdev/bios.h`, `subdev/bios/bit.h`, `subdev/bios/M0205.h`.
• Detected declarations: `function files`, `function nvbios_M0205Tp`, `function nvbios_M0205Ee`, `function nvbios_M0205Ep`, `function nvbios_M0205Se`, `function nvbios_M0205Sp`.
• Atlas domain: Driver Families / drivers/gpu.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.