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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 <nouveau@karolherbst.de>
*/
#include "priv.h"
static int
gk104_pcie_version_supported(struct nvkm_pci *pci)
{
return (nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x4) == 0x4 ? 2 : 1;
}
static void
gk104_pcie_set_cap_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)
{
struct nvkm_device *device = pci->subdev.device;
switch (speed) {
case NVKM_PCIE_SPEED_2_5:
gf100_pcie_set_cap_speed(pci, false);
nvkm_mask(device, 0x8c1c0, 0x30000, 0x10000);
break;
case NVKM_PCIE_SPEED_5_0:
gf100_pcie_set_cap_speed(pci, true);
nvkm_mask(device, 0x8c1c0, 0x30000, 0x20000);
break;
case NVKM_PCIE_SPEED_8_0:
gf100_pcie_set_cap_speed(pci, true);
nvkm_mask(device, 0x8c1c0, 0x30000, 0x30000);
break;
}
}
static enum nvkm_pcie_speed
gk104_pcie_cap_speed(struct nvkm_pci *pci)
{
int speed = gf100_pcie_cap_speed(pci);
if (speed == 0)
return NVKM_PCIE_SPEED_2_5;
if (speed >= 1) {
int speed2 = nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x30000;
switch (speed2) {
case 0x00000:
case 0x10000:
return NVKM_PCIE_SPEED_2_5;
case 0x20000:
return NVKM_PCIE_SPEED_5_0;
case 0x30000:
return NVKM_PCIE_SPEED_8_0;
}
}
return -EINVAL;
}
static void
gk104_pcie_set_lnkctl_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)
{
u8 reg_v = 0;
switch (speed) {
case NVKM_PCIE_SPEED_2_5:
reg_v = 1;
break;
case NVKM_PCIE_SPEED_5_0:
reg_v = 2;
break;
case NVKM_PCIE_SPEED_8_0:
reg_v = 3;
break;
}
nvkm_pci_mask(pci, 0xa8, 0x3, reg_v);
}
static enum nvkm_pcie_speed
gk104_pcie_lnkctl_speed(struct nvkm_pci *pci)
{
u8 reg_v = nvkm_pci_rd32(pci, 0xa8) & 0x3;
switch (reg_v) {
case 0:
case 1:
return NVKM_PCIE_SPEED_2_5;
case 2:
return NVKM_PCIE_SPEED_5_0;
case 3:
return NVKM_PCIE_SPEED_8_0;
}
return -1;
}
static enum nvkm_pcie_speed
gk104_pcie_max_speed(struct nvkm_pci *pci)
{
u32 max_speed = nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x300000;
switch (max_speed) {
case 0x000000:
return NVKM_PCIE_SPEED_8_0;
case 0x100000:
return NVKM_PCIE_SPEED_5_0;
case 0x200000:
return NVKM_PCIE_SPEED_2_5;
}
return NVKM_PCIE_SPEED_2_5;
}
static void
gk104_pcie_set_link_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)
{
struct nvkm_device *device = pci->subdev.device;
u32 mask_value;
switch (speed) {
case NVKM_PCIE_SPEED_8_0:
mask_value = 0x00000;
break;
case NVKM_PCIE_SPEED_5_0:
mask_value = 0x40000;
break;
case NVKM_PCIE_SPEED_2_5:
default:
mask_value = 0x80000;
break;
}
nvkm_mask(device, 0x8c040, 0xc0000, mask_value);
nvkm_mask(device, 0x8c040, 0x1, 0x1);
}
static int
gk104_pcie_init(struct nvkm_pci * pci)
{
enum nvkm_pcie_speed lnkctl_speed, max_speed, cap_speed;
struct nvkm_subdev *subdev = &pci->subdev;
if (gf100_pcie_version(pci) < 2)
return 0;
lnkctl_speed = gk104_pcie_lnkctl_speed(pci);
max_speed = gk104_pcie_max_speed(pci);
cap_speed = gk104_pcie_cap_speed(pci);
if (cap_speed != max_speed) {
nvkm_trace(subdev, "adjusting cap to max speed\n");
gk104_pcie_set_cap_speed(pci, max_speed);
cap_speed = gk104_pcie_cap_speed(pci);
if (cap_speed != max_speed)
nvkm_warn(subdev, "failed to adjust cap speed\n");
}
if (lnkctl_speed != max_speed) {
nvkm_debug(subdev, "adjusting lnkctl to max speed\n");
gk104_pcie_set_lnkctl_speed(pci, max_speed);
lnkctl_speed = gk104_pcie_lnkctl_speed(pci);
if (lnkctl_speed != max_speed)
nvkm_error(subdev, "failed to adjust lnkctl speed\n");
}
return 0;
}
static int
gk104_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width)
{
struct nvkm_subdev *subdev = &pci->subdev;
enum nvkm_pcie_speed lnk_ctl_speed = gk104_pcie_lnkctl_speed(pci);
enum nvkm_pcie_speed lnk_cap_speed = gk104_pcie_cap_speed(pci);
if (speed > lnk_cap_speed) {
speed = lnk_cap_speed;
nvkm_warn(subdev, "dropping requested speed due too low cap"
" speed\n");
}
if (speed > lnk_ctl_speed) {
speed = lnk_ctl_speed;
nvkm_warn(subdev, "dropping requested speed due too low"
" lnkctl speed\n");
}
gk104_pcie_set_link_speed(pci, speed);
return 0;
}
static const struct nvkm_pci_func
gk104_pci_func = {
.init = g84_pci_init,
.rd32 = nv40_pci_rd32,
.wr08 = nv40_pci_wr08,
.wr32 = nv40_pci_wr32,
.msi_rearm = nv40_pci_msi_rearm,
.pcie.init = gk104_pcie_init,
.pcie.set_link = gk104_pcie_set_link,
.pcie.max_speed = gk104_pcie_max_speed,
.pcie.cur_speed = g84_pcie_cur_speed,
.pcie.set_version = gf100_pcie_set_version,
.pcie.version = gf100_pcie_version,
.pcie.version_supported = gk104_pcie_version_supported,
};
int
gk104_pci_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
struct nvkm_pci **ppci)
{
return nvkm_pci_new_(&gk104_pci_func, device, type, inst, ppci);
}
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