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1/*2 * Copyright 2015 Karol Herbst <nouveau@karolherbst.de>3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: Karol Herbst <nouveau@karolherbst.de>23 */24#include "priv.h"25 26static int27gk104_pcie_version_supported(struct nvkm_pci *pci)28{29	return (nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x4) == 0x4 ? 2 : 1;30}31 32static void33gk104_pcie_set_cap_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)34{35	struct nvkm_device *device = pci->subdev.device;36 37	switch (speed) {38	case NVKM_PCIE_SPEED_2_5:39		gf100_pcie_set_cap_speed(pci, false);40		nvkm_mask(device, 0x8c1c0, 0x30000, 0x10000);41		break;42	case NVKM_PCIE_SPEED_5_0:43		gf100_pcie_set_cap_speed(pci, true);44		nvkm_mask(device, 0x8c1c0, 0x30000, 0x20000);45		break;46	case NVKM_PCIE_SPEED_8_0:47		gf100_pcie_set_cap_speed(pci, true);48		nvkm_mask(device, 0x8c1c0, 0x30000, 0x30000);49		break;50	}51}52 53static enum nvkm_pcie_speed54gk104_pcie_cap_speed(struct nvkm_pci *pci)55{56	int speed = gf100_pcie_cap_speed(pci);57 58	if (speed == 0)59		return NVKM_PCIE_SPEED_2_5;60 61	if (speed >= 1) {62		int speed2 = nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x30000;63		switch (speed2) {64		case 0x00000:65		case 0x10000:66			return NVKM_PCIE_SPEED_2_5;67		case 0x20000:68			return NVKM_PCIE_SPEED_5_0;69		case 0x30000:70			return NVKM_PCIE_SPEED_8_0;71		}72	}73 74	return -EINVAL;75}76 77static void78gk104_pcie_set_lnkctl_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)79{80	u8 reg_v = 0;81	switch (speed) {82	case NVKM_PCIE_SPEED_2_5:83		reg_v = 1;84		break;85	case NVKM_PCIE_SPEED_5_0:86		reg_v = 2;87		break;88	case NVKM_PCIE_SPEED_8_0:89		reg_v = 3;90		break;91	}92	nvkm_pci_mask(pci, 0xa8, 0x3, reg_v);93}94 95static enum nvkm_pcie_speed96gk104_pcie_lnkctl_speed(struct nvkm_pci *pci)97{98	u8 reg_v = nvkm_pci_rd32(pci, 0xa8) & 0x3;99	switch (reg_v) {100	case 0:101	case 1:102		return NVKM_PCIE_SPEED_2_5;103	case 2:104		return NVKM_PCIE_SPEED_5_0;105	case 3:106		return NVKM_PCIE_SPEED_8_0;107	}108	return -1;109}110 111static enum nvkm_pcie_speed112gk104_pcie_max_speed(struct nvkm_pci *pci)113{114	u32 max_speed = nvkm_rd32(pci->subdev.device, 0x8c1c0) & 0x300000;115	switch (max_speed) {116	case 0x000000:117		return NVKM_PCIE_SPEED_8_0;118	case 0x100000:119		return NVKM_PCIE_SPEED_5_0;120	case 0x200000:121		return NVKM_PCIE_SPEED_2_5;122	}123	return NVKM_PCIE_SPEED_2_5;124}125 126static void127gk104_pcie_set_link_speed(struct nvkm_pci *pci, enum nvkm_pcie_speed speed)128{129	struct nvkm_device *device = pci->subdev.device;130	u32 mask_value;131 132	switch (speed) {133	case NVKM_PCIE_SPEED_8_0:134		mask_value = 0x00000;135		break;136	case NVKM_PCIE_SPEED_5_0:137		mask_value = 0x40000;138		break;139	case NVKM_PCIE_SPEED_2_5:140	default:141		mask_value = 0x80000;142		break;143	}144 145	nvkm_mask(device, 0x8c040, 0xc0000, mask_value);146	nvkm_mask(device, 0x8c040, 0x1, 0x1);147}148 149static int150gk104_pcie_init(struct nvkm_pci * pci)151{152	enum nvkm_pcie_speed lnkctl_speed, max_speed, cap_speed;153	struct nvkm_subdev *subdev = &pci->subdev;154 155	if (gf100_pcie_version(pci) < 2)156		return 0;157 158	lnkctl_speed = gk104_pcie_lnkctl_speed(pci);159	max_speed = gk104_pcie_max_speed(pci);160	cap_speed = gk104_pcie_cap_speed(pci);161 162	if (cap_speed != max_speed) {163		nvkm_trace(subdev, "adjusting cap to max speed\n");164		gk104_pcie_set_cap_speed(pci, max_speed);165		cap_speed = gk104_pcie_cap_speed(pci);166		if (cap_speed != max_speed)167			nvkm_warn(subdev, "failed to adjust cap speed\n");168	}169 170	if (lnkctl_speed != max_speed) {171		nvkm_debug(subdev, "adjusting lnkctl to max speed\n");172		gk104_pcie_set_lnkctl_speed(pci, max_speed);173		lnkctl_speed = gk104_pcie_lnkctl_speed(pci);174		if (lnkctl_speed != max_speed)175			nvkm_error(subdev, "failed to adjust lnkctl speed\n");176	}177 178	return 0;179}180 181static int182gk104_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width)183{184	struct nvkm_subdev *subdev = &pci->subdev;185	enum nvkm_pcie_speed lnk_ctl_speed = gk104_pcie_lnkctl_speed(pci);186	enum nvkm_pcie_speed lnk_cap_speed = gk104_pcie_cap_speed(pci);187 188	if (speed > lnk_cap_speed) {189		speed = lnk_cap_speed;190		nvkm_warn(subdev, "dropping requested speed due too low cap"191			  " speed\n");192	}193 194	if (speed > lnk_ctl_speed) {195		speed = lnk_ctl_speed;196		nvkm_warn(subdev, "dropping requested speed due too low"197			  " lnkctl speed\n");198	}199 200	gk104_pcie_set_link_speed(pci, speed);201	return 0;202}203 204 205static const struct nvkm_pci_func206gk104_pci_func = {207	.init = g84_pci_init,208	.rd32 = nv40_pci_rd32,209	.wr08 = nv40_pci_wr08,210	.wr32 = nv40_pci_wr32,211	.msi_rearm = nv40_pci_msi_rearm,212 213	.pcie.init = gk104_pcie_init,214	.pcie.set_link = gk104_pcie_set_link,215 216	.pcie.max_speed = gk104_pcie_max_speed,217	.pcie.cur_speed = g84_pcie_cur_speed,218 219	.pcie.set_version = gf100_pcie_set_version,220	.pcie.version = gf100_pcie_version,221	.pcie.version_supported = gk104_pcie_version_supported,222};223 224int225gk104_pci_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,226	      struct nvkm_pci **ppci)227{228	return nvkm_pci_new_(&gk104_pci_func, device, type, inst, ppci);229}230