cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/engine/disp/vga.c

/*
 * Copyright 2012 Red Hat Inc.
 *
 * 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 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 HOLDER(S) OR AUTHOR(S) 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.
 *
 * Authors: Ben Skeggs
 */
#include <subdev/vga.h>


u8 nvkm_rdport(struct nvkm_device *device, int head, u16 port) { if (device->card_type >= NV_50) return nvkm_rd08(device, 0x601000 + port); if (port == 0x03c0 || port == 0x03c1 || /* AR */ port == 0x03c2 || port == 0x03da || /* INP0 */ port == 0x03d4 || port == 0x03d5) /* CR */ return nvkm_rd08(device, 0x601000 + (head * 0x2000) + port); if (port == 0x03c2 || port == 0x03cc || /* MISC */ port == 0x03c4 || port == 0x03c5 || /* SR */ port == 0x03ce || port == 0x03cf) { /* GR */ if (device->card_type < NV_40) head = 0; /* CR44 selects head */ return nvkm_rd08(device, 0x0c0000 + (head * 0x2000) + port); } return 0x00; }

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void nvkm_wrport(struct nvkm_device *device, int head, u16 port, u8 data) { if (device->card_type >= NV_50) nvkm_wr08(device, 0x601000 + port, data); else if (port == 0x03c0 || port == 0x03c1 || /* AR */ port == 0x03c2 || port == 0x03da || /* INP0 */ port == 0x03d4 || port == 0x03d5) /* CR */ nvkm_wr08(device, 0x601000 + (head * 0x2000) + port, data); else if (port == 0x03c2 || port == 0x03cc || /* MISC */ port == 0x03c4 || port == 0x03c5 || /* SR */ port == 0x03ce || port == 0x03cf) { /* GR */ if (device->card_type < NV_40) head = 0; /* CR44 selects head */ nvkm_wr08(device, 0x0c0000 + (head * 0x2000) + port, data); } }

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Ben Skeggs147100.00%3100.00%
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u8 nvkm_rdvgas(struct nvkm_device *device, int head, u8 index) { nvkm_wrport(device, head, 0x03c4, index); return nvkm_rdport(device, head, 0x03c5); }

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void nvkm_wrvgas(struct nvkm_device *device, int head, u8 index, u8 value) { nvkm_wrport(device, head, 0x03c4, index); nvkm_wrport(device, head, 0x03c5, value); }

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Ben Skeggs41100.00%2100.00%
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u8 nvkm_rdvgag(struct nvkm_device *device, int head, u8 index) { nvkm_wrport(device, head, 0x03ce, index); return nvkm_rdport(device, head, 0x03cf); }

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void nvkm_wrvgag(struct nvkm_device *device, int head, u8 index, u8 value) { nvkm_wrport(device, head, 0x03ce, index); nvkm_wrport(device, head, 0x03cf, value); }

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u8 nvkm_rdvgac(struct nvkm_device *device, int head, u8 index) { nvkm_wrport(device, head, 0x03d4, index); return nvkm_rdport(device, head, 0x03d5); }

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void nvkm_wrvgac(struct nvkm_device *device, int head, u8 index, u8 value) { nvkm_wrport(device, head, 0x03d4, index); nvkm_wrport(device, head, 0x03d5, value); }

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Ben Skeggs41100.00%2100.00%
Total41100.00%2100.00%


u8 nvkm_rdvgai(struct nvkm_device *device, int head, u16 port, u8 index) { if (port == 0x03c4) return nvkm_rdvgas(device, head, index); if (port == 0x03ce) return nvkm_rdvgag(device, head, index); if (port == 0x03d4) return nvkm_rdvgac(device, head, index); return 0x00; }

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Ben Skeggs70100.00%2100.00%
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void nvkm_wrvgai(struct nvkm_device *device, int head, u16 port, u8 index, u8 value) { if (port == 0x03c4) nvkm_wrvgas(device, head, index, value); else if (port == 0x03ce) nvkm_wrvgag(device, head, index, value); else if (port == 0x03d4) nvkm_wrvgac(device, head, index, value); }

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Ben Skeggs75100.00%2100.00%
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bool nvkm_lockvgac(struct nvkm_device *device, bool lock) { bool locked = !nvkm_rdvgac(device, 0, 0x1f); u8 data = lock ? 0x99 : 0x57; if (device->card_type < NV_50) nvkm_wrvgac(device, 0, 0x1f, data); else nvkm_wrvgac(device, 0, 0x3f, data); if (device->chipset == 0x11) { if (!(nvkm_rd32(device, 0x001084) & 0x10000000)) nvkm_wrvgac(device, 1, 0x1f, data); } return locked; }

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Ben Skeggs8783.65%375.00%
Ilia Mirkin1716.35%125.00%
Total104100.00%4100.00%

/* CR44 takes values 0 (head A), 3 (head B) and 4 (heads tied) * it affects only the 8 bit vga io regs, which we access using mmio at * 0xc{0,2}3c*, 0x60{1,3}3*, and 0x68{1,3}3d* * in general, the set value of cr44 does not matter: reg access works as * expected and values can be set for the appropriate head by using a 0x2000 * offset as required * however: * a) pre nv40, the head B range of PRMVIO regs at 0xc23c* was not exposed and * cr44 must be set to 0 or 3 for accessing values on the correct head * through the common 0xc03c* addresses * b) in tied mode (4) head B is programmed to the values set on head A, and * access using the head B addresses can have strange results, ergo we leave * tied mode in init once we know to what cr44 should be restored on exit * * the owner parameter is slightly abused: * 0 and 1 are treated as head values and so the set value is (owner * 3) * other values are treated as literal values to set */
u8 nvkm_rdvgaowner(struct nvkm_device *device) { if (device->card_type < NV_50) { if (device->chipset == 0x11) { u32 tied = nvkm_rd32(device, 0x001084) & 0x10000000; if (tied == 0) { u8 slA = nvkm_rdvgac(device, 0, 0x28) & 0x80; u8 tvA = nvkm_rdvgac(device, 0, 0x33) & 0x01; u8 slB = nvkm_rdvgac(device, 1, 0x28) & 0x80; u8 tvB = nvkm_rdvgac(device, 1, 0x33) & 0x01; if (slA && !tvA) return 0x00; if (slB && !tvB) return 0x03; if (slA) return 0x00; if (slB) return 0x03; return 0x00; } return 0x04; } return nvkm_rdvgac(device, 0, 0x44); } return 0x00; }

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void nvkm_wrvgaowner(struct nvkm_device *device, u8 select) { if (device->card_type < NV_50) { u8 owner = (select == 1) ? 3 : select; if (device->chipset == 0x11) { /* workaround hw lockup bug */ nvkm_rdvgac(device, 0, 0x1f); nvkm_rdvgac(device, 1, 0x1f); } nvkm_wrvgac(device, 0, 0x44, owner); if (device->chipset == 0x11) { nvkm_wrvgac(device, 0, 0x2e, owner); nvkm_wrvgac(device, 0, 0x2e, owner); } } }

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Ben Skeggs108100.00%2100.00%
Total108100.00%2100.00%


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Ben Skeggs102798.37%480.00%
Ilia Mirkin171.63%120.00%
Total1044100.00%5100.00%
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