drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk104.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk104.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/volt/gk104.c
Extension
.c
Size
4116 bytes
Lines
142
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 gk104_volt {
	struct nvkm_volt base;
	struct nvbios_volt bios;
};

static int
gk104_volt_get(struct nvkm_volt *base)
{
	struct nvbios_volt *bios = &gk104_volt(base)->bios;
	struct nvkm_device *device = base->subdev.device;
	u32 div, duty;

	div  = nvkm_rd32(device, 0x20340);
	duty = nvkm_rd32(device, 0x20344);

	return bios->base + bios->pwm_range * duty / div;
}

static int
gk104_volt_set(struct nvkm_volt *base, u32 uv)
{
	struct nvbios_volt *bios = &gk104_volt(base)->bios;
	struct nvkm_device *device = base->subdev.device;
	u32 div, duty;

	/* the blob uses this crystal frequency, let's use it too. */
	div = 27648000 / bios->pwm_freq;
	duty = DIV_ROUND_UP((uv - bios->base) * div, bios->pwm_range);

	nvkm_wr32(device, 0x20340, div);
	nvkm_wr32(device, 0x20344, 0x80000000 | duty);

	return 0;
}

static int
gk104_volt_speedo_read(struct nvkm_volt *volt)
{
	struct nvkm_device *device = volt->subdev.device;
	struct nvkm_fuse *fuse = device->fuse;
	int ret;

	if (!fuse)
		return -EINVAL;

	nvkm_wr32(device, 0x122634, 0x0);
	ret = nvkm_fuse_read(fuse, 0x3a8);
	nvkm_wr32(device, 0x122634, 0x41);
	return ret;
}

static const struct nvkm_volt_func
gk104_volt_pwm = {
	.oneinit = gf100_volt_oneinit,
	.volt_get = gk104_volt_get,
	.volt_set = gk104_volt_set,
	.speedo_read = gk104_volt_speedo_read,
}, gk104_volt_gpio = {
	.oneinit = gf100_volt_oneinit,
	.vid_get = nvkm_voltgpio_get,
	.vid_set = nvkm_voltgpio_set,
	.speedo_read = gk104_volt_speedo_read,
};

int
gk104_volt_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
	       struct nvkm_volt **pvolt)
{
	const struct nvkm_volt_func *volt_func = &gk104_volt_gpio;
	struct dcb_gpio_func gpio;
	struct nvbios_volt bios;
	struct gk104_volt *volt;
	u8 ver, hdr, cnt, len;
	const char *mode;

	if (!nvbios_volt_parse(device->bios, &ver, &hdr, &cnt, &len, &bios))
		return 0;

	if (!nvkm_gpio_find(device->gpio, 0, DCB_GPIO_VID_PWM, 0xff, &gpio) &&
	    bios.type == NVBIOS_VOLT_PWM) {
		volt_func = &gk104_volt_pwm;
	}

	if (!(volt = kzalloc_obj(*volt)))
		return -ENOMEM;
	nvkm_volt_ctor(volt_func, device, type, inst, &volt->base);
	*pvolt = &volt->base;
	volt->bios = bios;

	/* now that we have a subdev, we can show an error if we found through

Annotation

Implementation Notes