drivers/gpu/drm/nouveau/nvkm/subdev/gpio/gf119.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/gpio/gf119.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/gpio/gf119.c
Extension
.c
Size
2832 bytes
Lines
88
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"

void
gf119_gpio_reset(struct nvkm_gpio *gpio, u8 match)
{
	struct nvkm_device *device = gpio->subdev.device;
	struct nvkm_bios *bios = device->bios;
	u8 ver, len;
	u16 entry;
	int ent = -1;

	while ((entry = dcb_gpio_entry(bios, 0, ++ent, &ver, &len))) {
		u32 data = nvbios_rd32(bios, entry);
		u8  line =   (data & 0x0000003f);
		u8  defs = !!(data & 0x00000080);
		u8  func =   (data & 0x0000ff00) >> 8;
		u8  unk0 =   (data & 0x00ff0000) >> 16;
		u8  unk1 =   (data & 0x1f000000) >> 24;

		if ( func  == DCB_GPIO_UNUSED ||
		    (match != DCB_GPIO_UNUSED && match != func))
			continue;

		nvkm_gpio_set(gpio, 0, func, line, defs);

		nvkm_mask(device, 0x00d610 + (line * 4), 0xff, unk0);
		if (unk1--)
			nvkm_mask(device, 0x00d740 + (unk1 * 4), 0xff, line);
	}
}

int
gf119_gpio_drive(struct nvkm_gpio *gpio, int line, int dir, int out)
{
	struct nvkm_device *device = gpio->subdev.device;
	u32 data = ((dir ^ 1) << 13) | (out << 12);
	nvkm_mask(device, 0x00d610 + (line * 4), 0x00003000, data);
	nvkm_mask(device, 0x00d604, 0x00000001, 0x00000001); /* update? */
	return 0;
}

int
gf119_gpio_sense(struct nvkm_gpio *gpio, int line)
{
	struct nvkm_device *device = gpio->subdev.device;
	return !!(nvkm_rd32(device, 0x00d610 + (line * 4)) & 0x00004000);
}

static const struct nvkm_gpio_func
gf119_gpio = {
	.lines = 32,
	.intr_stat = g94_gpio_intr_stat,
	.intr_mask = g94_gpio_intr_mask,
	.drive = gf119_gpio_drive,
	.sense = gf119_gpio_sense,
	.reset = gf119_gpio_reset,
};

int
gf119_gpio_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
	       struct nvkm_gpio **pgpio)
{
	return nvkm_gpio_new_(&gf119_gpio, device, type, inst, pgpio);
}

Annotation

Implementation Notes