drivers/gpu/drm/nouveau/nvkm/subdev/bus/hwsq.c

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

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/bus/hwsq.c
Extension
.c
Size
4562 bytes
Lines
178
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

struct nvkm_hwsq {
	struct nvkm_subdev *subdev;
	u32 addr;
	u32 data;
	struct {
		u8 data[512];
		u16 size;
	} c;
};

static void
hwsq_cmd(struct nvkm_hwsq *hwsq, int size, u8 data[])
{
	memcpy(&hwsq->c.data[hwsq->c.size], data, size * sizeof(data[0]));
	hwsq->c.size += size;
}

int
nvkm_hwsq_init(struct nvkm_subdev *subdev, struct nvkm_hwsq **phwsq)
{
	struct nvkm_hwsq *hwsq;

	hwsq = *phwsq = kmalloc_obj(*hwsq);
	if (hwsq) {
		hwsq->subdev = subdev;
		hwsq->addr = ~0;
		hwsq->data = ~0;
		memset(hwsq->c.data, 0x7f, sizeof(hwsq->c.data));
		hwsq->c.size = 0;
	}

	return hwsq ? 0 : -ENOMEM;
}

int
nvkm_hwsq_fini(struct nvkm_hwsq **phwsq, bool exec)
{
	struct nvkm_hwsq *hwsq = *phwsq;
	int ret = 0, i;
	if (hwsq) {
		struct nvkm_subdev *subdev = hwsq->subdev;
		struct nvkm_bus *bus = subdev->device->bus;
		hwsq->c.size = (hwsq->c.size + 4) / 4;
		if (hwsq->c.size <= bus->func->hwsq_size) {
			if (exec)
				ret = bus->func->hwsq_exec(bus,
							   (u32 *)hwsq->c.data,
								  hwsq->c.size);
			if (ret)
				nvkm_error(subdev, "hwsq exec failed: %d\n", ret);
		} else {
			nvkm_error(subdev, "hwsq ucode too large\n");
			ret = -ENOSPC;
		}

		for (i = 0; ret && i < hwsq->c.size; i++)
			nvkm_error(subdev, "\t%08x\n", ((u32 *)hwsq->c.data)[i]);

		*phwsq = NULL;
		kfree(hwsq);
	}
	return ret;
}

void
nvkm_hwsq_wr32(struct nvkm_hwsq *hwsq, u32 addr, u32 data)
{
	nvkm_debug(hwsq->subdev, "R[%06x] = %08x\n", addr, data);

	if (hwsq->data != data) {
		if ((data & 0xffff0000) != (hwsq->data & 0xffff0000)) {
			hwsq_cmd(hwsq, 5, (u8[]){ 0xe2, data, data >> 8,
						  data >> 16, data >> 24 });
		} else {
			hwsq_cmd(hwsq, 3, (u8[]){ 0x42, data, data >> 8 });
		}
	}

	if ((addr & 0xffff0000) != (hwsq->addr & 0xffff0000)) {
		hwsq_cmd(hwsq, 5, (u8[]){ 0xe0, addr, addr >> 8,
					  addr >> 16, addr >> 24 });
	} else {
		hwsq_cmd(hwsq, 3, (u8[]){ 0x40, addr, addr >> 8 });
	}

	hwsq->addr = addr;
	hwsq->data = data;
}

void

Annotation

Implementation Notes