drivers/gpu/drm/nouveau/nvkm/subdev/gpio/g94.c

Source file repositories/reference/linux-study-clean/drivers/gpu/drm/nouveau/nvkm/subdev/gpio/g94.c

File Facts

System
Linux kernel
Corpus path
drivers/gpu/drm/nouveau/nvkm/subdev/gpio/g94.c
Extension
.c
Size
2643 bytes
Lines
76
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
g94_gpio_intr_stat(struct nvkm_gpio *gpio, u32 *hi, u32 *lo)
{
	struct nvkm_device *device = gpio->subdev.device;
	u32 intr0 = nvkm_rd32(device, 0x00e054);
	u32 intr1 = nvkm_rd32(device, 0x00e074);
	u32 stat0 = nvkm_rd32(device, 0x00e050) & intr0;
	u32 stat1 = nvkm_rd32(device, 0x00e070) & intr1;
	*lo = (stat1 & 0xffff0000) | (stat0 >> 16);
	*hi = (stat1 << 16) | (stat0 & 0x0000ffff);
	nvkm_wr32(device, 0x00e054, intr0);
	nvkm_wr32(device, 0x00e074, intr1);
}

void
g94_gpio_intr_mask(struct nvkm_gpio *gpio, u32 type, u32 mask, u32 data)
{
	struct nvkm_device *device = gpio->subdev.device;
	u32 inte0 = nvkm_rd32(device, 0x00e050);
	u32 inte1 = nvkm_rd32(device, 0x00e070);
	if (type & NVKM_GPIO_LO)
		inte0 = (inte0 & ~(mask << 16)) | (data << 16);
	if (type & NVKM_GPIO_HI)
		inte0 = (inte0 & ~(mask & 0xffff)) | (data & 0xffff);
	mask >>= 16;
	data >>= 16;
	if (type & NVKM_GPIO_LO)
		inte1 = (inte1 & ~(mask << 16)) | (data << 16);
	if (type & NVKM_GPIO_HI)
		inte1 = (inte1 & ~mask) | data;
	nvkm_wr32(device, 0x00e050, inte0);
	nvkm_wr32(device, 0x00e070, inte1);
}

static const struct nvkm_gpio_func
g94_gpio = {
	.lines = 32,
	.intr_stat = g94_gpio_intr_stat,
	.intr_mask = g94_gpio_intr_mask,
	.drive = nv50_gpio_drive,
	.sense = nv50_gpio_sense,
	.reset = nv50_gpio_reset,
};

int
g94_gpio_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
	     struct nvkm_gpio **pgpio)
{
	return nvkm_gpio_new_(&g94_gpio, device, type, inst, pgpio);
}

Annotation

Implementation Notes