drivers/gpu/drm/nouveau/nvkm/subdev/bus/nv31.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/bus/nv31.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/bus/nv31.c
Extension
.c
Size
2775 bytes
Lines
90
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 <subdev/gpio.h>
#include <subdev/therm.h>

static void
nv31_bus_intr(struct nvkm_bus *bus)
{
	struct nvkm_subdev *subdev = &bus->subdev;
	struct nvkm_device *device = subdev->device;
	u32 stat = nvkm_rd32(device, 0x001100) & nvkm_rd32(device, 0x001140);
	u32 gpio = nvkm_rd32(device, 0x001104) & nvkm_rd32(device, 0x001144);

	if (gpio) {
		struct nvkm_gpio *gpio = device->gpio;
		if (gpio)
			nvkm_subdev_intr(&gpio->subdev);
	}

	if (stat & 0x00000008) {  /* NV41- */
		u32 addr = nvkm_rd32(device, 0x009084);
		u32 data = nvkm_rd32(device, 0x009088);

		nvkm_error_ratelimited(subdev, "MMIO %s of %08x FAULT at %06x\n",
				       (addr & 0x00000002) ? "write" : "read", data,
				       (addr & 0x00fffffc));

		stat &= ~0x00000008;
		nvkm_wr32(device, 0x001100, 0x00000008);
	}

	if (stat & 0x00070000) {
		struct nvkm_therm *therm = device->therm;
		if (therm)
			nvkm_subdev_intr(&therm->subdev);
		stat &= ~0x00070000;
		nvkm_wr32(device, 0x001100, 0x00070000);
	}

	if (stat) {
		nvkm_error(subdev, "intr %08x\n", stat);
		nvkm_mask(device, 0x001140, stat, 0x00000000);
	}
}

static void
nv31_bus_init(struct nvkm_bus *bus)
{
	struct nvkm_device *device = bus->subdev.device;
	nvkm_wr32(device, 0x001100, 0xffffffff);
	nvkm_wr32(device, 0x001140, 0x00070008);
}

static const struct nvkm_bus_func
nv31_bus = {
	.init = nv31_bus_init,
	.intr = nv31_bus_intr,
};

int
nv31_bus_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
	     struct nvkm_bus **pbus)
{
	return nvkm_bus_new_(&nv31_bus, device, type, inst, pbus);
}

Annotation

Implementation Notes