drivers/gpu/drm/nouveau/nvkm/falcon/v1.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/falcon/v1.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/falcon/v1.c
Extension
.c
Size
2986 bytes
Lines
102
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

#include "priv.h"

#include <core/gpuobj.h>
#include <core/memory.h>
#include <subdev/timer.h>

void
nvkm_falcon_v1_load_imem(struct nvkm_falcon *falcon, void *data, u32 start,
			 u32 size, u16 tag, u8 port, bool secure)
{
	u8 rem = size % 4;
	u32 reg;
	int i;

	size -= rem;

	reg = start | BIT(24) | (secure ? BIT(28) : 0);
	nvkm_falcon_wr32(falcon, 0x180 + (port * 16), reg);
	for (i = 0; i < size / 4; i++) {
		/* write new tag every 256B */
		if ((i & 0x3f) == 0)
			nvkm_falcon_wr32(falcon, 0x188 + (port * 16), tag++);
		nvkm_falcon_wr32(falcon, 0x184 + (port * 16), ((u32 *)data)[i]);
	}

	/*
	 * If size is not a multiple of 4, mask the last work to ensure garbage
	 * does not get written
	 */
	if (rem) {
		u32 extra = ((u32 *)data)[i];

		/* write new tag every 256B */
		if ((i & 0x3f) == 0)
			nvkm_falcon_wr32(falcon, 0x188 + (port * 16), tag++);
		nvkm_falcon_wr32(falcon, 0x184 + (port * 16),
				 extra & (BIT(rem * 8) - 1));
		++i;
	}

	/* code must be padded to 0x40 words */
	for (; i & 0x3f; i++)
		nvkm_falcon_wr32(falcon, 0x184 + (port * 16), 0);
}

void
nvkm_falcon_v1_load_dmem(struct nvkm_falcon *falcon, void *data, u32 start,
			 u32 size, u8 port)
{
	u8 rem = size % 4;
	int i;

	size -= rem;

	nvkm_falcon_wr32(falcon, 0x1c0 + (port * 8), start | (0x1 << 24));
	for (i = 0; i < size / 4; i++)
		nvkm_falcon_wr32(falcon, 0x1c4 + (port * 8), ((u32 *)data)[i]);

	/*
	 * If size is not a multiple of 4, mask the last word to ensure garbage
	 * does not get written
	 */
	if (rem) {
		u32 extra = ((u32 *)data)[i];

		nvkm_falcon_wr32(falcon, 0x1c4 + (port * 8),
				 extra & (BIT(rem * 8) - 1));
	}
}

void
nvkm_falcon_v1_start(struct nvkm_falcon *falcon)
{
	u32 reg = nvkm_falcon_rd32(falcon, 0x100);

	if (reg & BIT(6))
		nvkm_falcon_wr32(falcon, 0x130, 0x2);
	else
		nvkm_falcon_wr32(falcon, 0x100, 0x2);
}

Annotation

Implementation Notes