/* * 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) { … } void nvkm_wrport(struct nvkm_device *device, int head, u16 port, u8 data) { … } u8 nvkm_rdvgas(struct nvkm_device *device, int head, u8 index) { … } void nvkm_wrvgas(struct nvkm_device *device, int head, u8 index, u8 value) { … } u8 nvkm_rdvgag(struct nvkm_device *device, int head, u8 index) { … } void nvkm_wrvgag(struct nvkm_device *device, int head, u8 index, u8 value) { … } u8 nvkm_rdvgac(struct nvkm_device *device, int head, u8 index) { … } void nvkm_wrvgac(struct nvkm_device *device, int head, u8 index, u8 value) { … } u8 nvkm_rdvgai(struct nvkm_device *device, int head, u16 port, u8 index) { … } void nvkm_wrvgai(struct nvkm_device *device, int head, u16 port, u8 index, u8 value) { … } bool nvkm_lockvgac(struct nvkm_device *device, bool lock) { … } /* 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) { … } void nvkm_wrvgaowner(struct nvkm_device *device, u8 select) { … }
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