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/*
* Copyright 2015 Karol Herbst <nouveau@karolherbst.de>
*
* 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: Karol Herbst <git@karolherbst.de>
*/
#include "priv.h"
static char *nvkm_pcie_speeds[] = {
"2.5GT/s",
"5.0GT/s",
"8.0GT/s",
};
static enum nvkm_pcie_speed
nvkm_pcie_speed(enum pci_bus_speed speed)
{
switch (speed) {
case PCIE_SPEED_2_5GT:
return NVKM_PCIE_SPEED_2_5;
case PCIE_SPEED_5_0GT:
return NVKM_PCIE_SPEED_5_0;
case PCIE_SPEED_8_0GT:
return NVKM_PCIE_SPEED_8_0;
default:
/* XXX 0x16 is 8_0, assume 0x17 will be 16_0 for now */
if (speed == 0x17)
return NVKM_PCIE_SPEED_8_0;
return -1;
}
}
static int
nvkm_pcie_get_version(struct nvkm_pci *pci)
{
if (!pci->func->pcie.version)
return -ENOSYS;
return pci->func->pcie.version(pci);
}
static int
nvkm_pcie_get_max_version(struct nvkm_pci *pci)
{
if (!pci->func->pcie.version_supported)
return -ENOSYS;
return pci->func->pcie.version_supported(pci);
}
static int
nvkm_pcie_set_version(struct nvkm_pci *pci, int version)
{
if (!pci->func->pcie.set_version)
return -ENOSYS;
nvkm_trace(&pci->subdev, "set to version %i\n", version);
pci->func->pcie.set_version(pci, version);
return nvkm_pcie_get_version(pci);
}
int
nvkm_pcie_oneinit(struct nvkm_pci *pci)
{
if (pci->func->pcie.max_speed)
nvkm_debug(&pci->subdev, "pcie max speed: %s\n",
nvkm_pcie_speeds[pci->func->pcie.max_speed(pci)]);
return 0;
}
int
nvkm_pcie_init(struct nvkm_pci *pci)
{
struct nvkm_subdev *subdev = &pci->subdev;
int ret;
/* raise pcie version first */
ret = nvkm_pcie_get_version(pci);
if (ret > 0) {
int max_version = nvkm_pcie_get_max_version(pci);
if (max_version > 0 && max_version > ret)
ret = nvkm_pcie_set_version(pci, max_version);
if (ret < max_version)
nvkm_error(subdev, "couldn't raise version: %i\n", ret);
}
if (pci->func->pcie.init)
pci->func->pcie.init(pci);
if (pci->pcie.speed != -1)
nvkm_pcie_set_link(pci, pci->pcie.speed, pci->pcie.width);
return 0;
}
int
nvkm_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width)
{
struct nvkm_subdev *subdev = &pci->subdev;
enum nvkm_pcie_speed cur_speed, max_speed;
struct pci_bus *pbus;
int ret;
if (!pci || !pci_is_pcie(pci->pdev))
return 0;
pbus = pci->pdev->bus;
if (!pci->func->pcie.set_link)
return -ENOSYS;
nvkm_trace(subdev, "requested %s\n", nvkm_pcie_speeds[speed]);
if (pci->func->pcie.version(pci) < 2) {
nvkm_error(subdev, "setting link failed due to low version\n");
return -ENODEV;
}
cur_speed = pci->func->pcie.cur_speed(pci);
max_speed = min(nvkm_pcie_speed(pbus->max_bus_speed),
pci->func->pcie.max_speed(pci));
nvkm_trace(subdev, "current speed: %s\n", nvkm_pcie_speeds[cur_speed]);
if (speed > max_speed) {
nvkm_debug(subdev, "%s not supported by bus or card, dropping"
"requested speed to %s", nvkm_pcie_speeds[speed],
nvkm_pcie_speeds[max_speed]);
speed = max_speed;
}
pci->pcie.speed = speed;
pci->pcie.width = width;
if (speed == cur_speed) {
nvkm_debug(subdev, "requested matches current speed\n");
return speed;
}
nvkm_debug(subdev, "set link to %s x%i\n",
nvkm_pcie_speeds[speed], width);
ret = pci->func->pcie.set_link(pci, speed, width);
if (ret < 0)
nvkm_error(subdev, "setting link failed: %i\n", ret);
return ret;
}
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