/*
* Copyright (c) 2017-2018, NVIDIA CORPORATION. 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 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 AUTHORS OR COPYRIGHT HOLDERS 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.
*/
#ifndef NVGPU_XVE_H
#define NVGPU_XVE_H
#include <nvgpu/types.h>
#include <nvgpu/log2.h>
/*
* For the available speeds bitmap.
*/
#define GPU_XVE_SPEED_2P5 (1 << 0)
#define GPU_XVE_SPEED_5P0 (1 << 1)
#define GPU_XVE_SPEED_8P0 (1 << 2)
#define GPU_XVE_NR_SPEEDS 3
#define GPU_XVE_SPEED_MASK (GPU_XVE_SPEED_2P5 | \
GPU_XVE_SPEED_5P0 | \
GPU_XVE_SPEED_8P0)
/*
* The HW uses a 2 bit field where speed is defined by a number:
*
* NV_XVE_LINK_CONTROL_STATUS_LINK_SPEED_2P5 = 1
* NV_XVE_LINK_CONTROL_STATUS_LINK_SPEED_5P0 = 2
* NV_XVE_LINK_CONTROL_STATUS_LINK_SPEED_8P0 = 3
*
* This isn't ideal for a bitmap with available speeds. So the external
* APIs think about speeds as a bit in a bitmap and this function converts
* from those bits to the actual HW speed setting.
*
* @speed_bit must have only 1 bit set and must be one of the 3 available
* HW speeds. Not all chips support all speeds so use available_speeds() to
* determine what a given chip supports.
*/
static inline const char *xve_speed_to_str(u32 speed)
{
if (!speed || !is_power_of_2(speed) ||
!(speed & GPU_XVE_SPEED_MASK)) {
return "Unknown ???";
}
return speed & GPU_XVE_SPEED_2P5 ? "Gen1" :
speed & GPU_XVE_SPEED_5P0 ? "Gen2" :
speed & GPU_XVE_SPEED_8P0 ? "Gen3" :
"Unknown ???";
}
#endif /* NVGPU_XVE_H */
