drivers/gpu/drm/nouveau/nvkm/subdev/bios/M0209.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/bios/M0209.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/bios/M0209.c
Extension
.c
Size
3926 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.

Dependency Surface

Detected Declarations

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 = 1;
				*cnt = nvbios_rd08(bios, data + 0x04);
				return data;
			default:
				break;
			}
		}
	}

	return 0x00000000;
}

u32
nvbios_M0209Ee(struct nvkm_bios *bios, int idx,
	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
{
	u8  snr, ssz;
	u32 data = nvbios_M0209Te(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_M0209Ep(struct nvkm_bios *bios, int idx,
	       u8 *ver, u8 *hdr, u8 *cnt, u8 *len, struct nvbios_M0209E *info)
{
	u32 data = nvbios_M0209Ee(bios, idx, ver, hdr, cnt, len);
	memset(info, 0x00, sizeof(*info));
	switch (!!data * *ver) {
	case 0x10:
		info->v00_40 = (nvbios_rd08(bios, data + 0x00) & 0x40) >> 6;
		info->bits   =  nvbios_rd08(bios, data + 0x00) & 0x3f;
		info->modulo =  nvbios_rd08(bios, data + 0x01);
		info->v02_40 = (nvbios_rd08(bios, data + 0x02) & 0x40) >> 6;
		info->v02_07 =  nvbios_rd08(bios, data + 0x02) & 0x07;
		info->v03    =  nvbios_rd08(bios, data + 0x03);
		return data;
	default:
		break;
	}
	return 0x00000000;
}

u32
nvbios_M0209Se(struct nvkm_bios *bios, int ent, int idx, u8 *ver, u8 *hdr)
{

	u8  cnt, len;
	u32 data = nvbios_M0209Ee(bios, ent, ver, hdr, &cnt, &len);
	if (data && idx < cnt) {
		data = data + *hdr + idx * len;
		*hdr = len;
		return data;
	}
	return 0x00000000;
}

u32
nvbios_M0209Sp(struct nvkm_bios *bios, int ent, int idx, u8 *ver, u8 *hdr,
	       struct nvbios_M0209S *info)
{
	struct nvbios_M0209E M0209E;
	u8  cnt, len;
	u32 data = nvbios_M0209Ep(bios, ent, ver, hdr, &cnt, &len, &M0209E);
	if (data) {
		u32 i, data = nvbios_M0209Se(bios, ent, idx, ver, hdr);
		memset(info, 0x00, sizeof(*info));
		switch (!!data * *ver) {
		case 0x10:
			for (i = 0; i < ARRAY_SIZE(info->data); i++) {
				u32 bits = (i % M0209E.modulo) * M0209E.bits;
				u32 mask = (1ULL << M0209E.bits) - 1;
				u16  off = bits / 8;
				u8   mod = bits % 8;
				info->data[i] = nvbios_rd32(bios, data + off);
				info->data[i] = info->data[i] >> mod;
				info->data[i] = info->data[i] & mask;

Annotation

Implementation Notes