cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/gpio/nv10.c

/*
 * Copyright (C) 2009 Francisco Jerez.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
#include "priv.h"


static int nv10_gpio_sense(struct nvkm_gpio *gpio, int line) { struct nvkm_device *device = gpio->subdev.device; if (line < 2) { line = line * 16; line = nvkm_rd32(device, 0x600818) >> line; return !!(line & 0x0100); } else if (line < 10) { line = (line - 2) * 4; line = nvkm_rd32(device, 0x60081c) >> line; return !!(line & 0x04); } else if (line < 14) { line = (line - 10) * 4; line = nvkm_rd32(device, 0x600850) >> line; return !!(line & 0x04); } return -EINVAL; }

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static int nv10_gpio_drive(struct nvkm_gpio *gpio, int line, int dir, int out) { struct nvkm_device *device = gpio->subdev.device; u32 reg, mask, data; if (line < 2) { line = line * 16; reg = 0x600818; mask = 0x00000011; data = (dir << 4) | out; } else if (line < 10) { line = (line - 2) * 4; reg = 0x60081c; mask = 0x00000003; data = (dir << 1) | out; } else if (line < 14) { line = (line - 10) * 4; reg = 0x600850; mask = 0x00000003; data = (dir << 1) | out; } else { return -EINVAL; } nvkm_mask(device, reg, mask << line, data << line); return 0; }

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static void nv10_gpio_intr_stat(struct nvkm_gpio *gpio, u32 *hi, u32 *lo) { struct nvkm_device *device = gpio->subdev.device; u32 intr = nvkm_rd32(device, 0x001104); u32 stat = nvkm_rd32(device, 0x001144) & intr; *lo = (stat & 0xffff0000) >> 16; *hi = (stat & 0x0000ffff); nvkm_wr32(device, 0x001104, intr); }

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static void nv10_gpio_intr_mask(struct nvkm_gpio *gpio, u32 type, u32 mask, u32 data) { struct nvkm_device *device = gpio->subdev.device; u32 inte = nvkm_rd32(device, 0x001144); if (type & NVKM_GPIO_LO) inte = (inte & ~(mask << 16)) | (data << 16); if (type & NVKM_GPIO_HI) inte = (inte & ~mask) | data; nvkm_wr32(device, 0x001144, inte); }

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static const struct nvkm_gpio_func nv10_gpio = { .lines = 16, .intr_stat = nv10_gpio_intr_stat, .intr_mask = nv10_gpio_intr_mask, .drive = nv10_gpio_drive, .sense = nv10_gpio_sense, };
int nv10_gpio_new(struct nvkm_device *device, int index, struct nvkm_gpio **pgpio) { return nvkm_gpio_new_(&nv10_gpio, device, index, pgpio); }

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