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1// SPDX-License-Identifier: GPL-2.02/* Marvell OcteonTX CPT driver3 *4 * Copyright (C) 2019 Marvell International Ltd.5 *6 * This program is free software; you can redistribute it and/or modify7 * it under the terms of the GNU General Public License version 2 as8 * published by the Free Software Foundation.9 */10 11#include <linux/delay.h>12#include "otx_cptvf.h"13 14#define CPT_MBOX_MSG_TIMEOUT 200015 16static char *get_mbox_opcode_str(int msg_opcode)17{18 char *str = "Unknown";19 20 switch (msg_opcode) {21 case OTX_CPT_MSG_VF_UP:22 str = "UP";23 break;24 25 case OTX_CPT_MSG_VF_DOWN:26 str = "DOWN";27 break;28 29 case OTX_CPT_MSG_READY:30 str = "READY";31 break;32 33 case OTX_CPT_MSG_QLEN:34 str = "QLEN";35 break;36 37 case OTX_CPT_MSG_QBIND_GRP:38 str = "QBIND_GRP";39 break;40 41 case OTX_CPT_MSG_VQ_PRIORITY:42 str = "VQ_PRIORITY";43 break;44 45 case OTX_CPT_MSG_PF_TYPE:46 str = "PF_TYPE";47 break;48 49 case OTX_CPT_MSG_ACK:50 str = "ACK";51 break;52 53 case OTX_CPT_MSG_NACK:54 str = "NACK";55 break;56 }57 return str;58}59 60static void dump_mbox_msg(struct otx_cpt_mbox *mbox_msg, int vf_id)61{62 char raw_data_str[OTX_CPT_MAX_MBOX_DATA_STR_SIZE];63 64 hex_dump_to_buffer(mbox_msg, sizeof(struct otx_cpt_mbox), 16, 8,65 raw_data_str, OTX_CPT_MAX_MBOX_DATA_STR_SIZE, false);66 if (vf_id >= 0)67 pr_debug("MBOX msg %s received from VF%d raw_data %s",68 get_mbox_opcode_str(mbox_msg->msg), vf_id,69 raw_data_str);70 else71 pr_debug("MBOX msg %s received from PF raw_data %s",72 get_mbox_opcode_str(mbox_msg->msg), raw_data_str);73}74 75static void cptvf_send_msg_to_pf(struct otx_cptvf *cptvf,76 struct otx_cpt_mbox *mbx)77{78 /* Writing mbox(1) causes interrupt */79 writeq(mbx->msg, cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 0));80 writeq(mbx->data, cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 1));81}82 83/* Interrupt handler to handle mailbox messages from VFs */84void otx_cptvf_handle_mbox_intr(struct otx_cptvf *cptvf)85{86 struct otx_cpt_mbox mbx = {};87 88 /*89 * MBOX[0] contains msg90 * MBOX[1] contains data91 */92 mbx.msg = readq(cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 0));93 mbx.data = readq(cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 1));94 95 dump_mbox_msg(&mbx, -1);96 97 switch (mbx.msg) {98 case OTX_CPT_MSG_VF_UP:99 cptvf->pf_acked = true;100 cptvf->num_vfs = mbx.data;101 break;102 case OTX_CPT_MSG_READY:103 cptvf->pf_acked = true;104 cptvf->vfid = mbx.data;105 dev_dbg(&cptvf->pdev->dev, "Received VFID %d\n", cptvf->vfid);106 break;107 case OTX_CPT_MSG_QBIND_GRP:108 cptvf->pf_acked = true;109 cptvf->vftype = mbx.data;110 dev_dbg(&cptvf->pdev->dev, "VF %d type %s group %d\n",111 cptvf->vfid,112 ((mbx.data == OTX_CPT_SE_TYPES) ? "SE" : "AE"),113 cptvf->vfgrp);114 break;115 case OTX_CPT_MSG_ACK:116 cptvf->pf_acked = true;117 break;118 case OTX_CPT_MSG_NACK:119 cptvf->pf_nacked = true;120 break;121 default:122 dev_err(&cptvf->pdev->dev, "Invalid msg from PF, msg 0x%llx\n",123 mbx.msg);124 break;125 }126}127 128static int cptvf_send_msg_to_pf_timeout(struct otx_cptvf *cptvf,129 struct otx_cpt_mbox *mbx)130{131 int timeout = CPT_MBOX_MSG_TIMEOUT;132 int sleep = 10;133 134 cptvf->pf_acked = false;135 cptvf->pf_nacked = false;136 cptvf_send_msg_to_pf(cptvf, mbx);137 /* Wait for previous message to be acked, timeout 2sec */138 while (!cptvf->pf_acked) {139 if (cptvf->pf_nacked)140 return -EINVAL;141 msleep(sleep);142 if (cptvf->pf_acked)143 break;144 timeout -= sleep;145 if (!timeout) {146 dev_err(&cptvf->pdev->dev,147 "PF didn't ack to mbox msg %llx from VF%u\n",148 mbx->msg, cptvf->vfid);149 return -EBUSY;150 }151 }152 return 0;153}154 155/*156 * Checks if VF is able to comminicate with PF157 * and also gets the CPT number this VF is associated to.158 */159int otx_cptvf_check_pf_ready(struct otx_cptvf *cptvf)160{161 struct otx_cpt_mbox mbx = {};162 163 mbx.msg = OTX_CPT_MSG_READY;164 165 return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);166}167 168/*169 * Communicate VQs size to PF to program CPT(0)_PF_Q(0-15)_CTL of the VF.170 * Must be ACKed.171 */172int otx_cptvf_send_vq_size_msg(struct otx_cptvf *cptvf)173{174 struct otx_cpt_mbox mbx = {};175 176 mbx.msg = OTX_CPT_MSG_QLEN;177 mbx.data = cptvf->qsize;178 179 return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);180}181 182/*183 * Communicate VF group required to PF and get the VQ binded to that group184 */185int otx_cptvf_send_vf_to_grp_msg(struct otx_cptvf *cptvf, int group)186{187 struct otx_cpt_mbox mbx = {};188 int ret;189 190 mbx.msg = OTX_CPT_MSG_QBIND_GRP;191 /* Convey group of the VF */192 mbx.data = group;193 ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);194 if (ret)195 return ret;196 cptvf->vfgrp = group;197 198 return 0;199}200 201/*202 * Communicate VF group required to PF and get the VQ binded to that group203 */204int otx_cptvf_send_vf_priority_msg(struct otx_cptvf *cptvf)205{206 struct otx_cpt_mbox mbx = {};207 208 mbx.msg = OTX_CPT_MSG_VQ_PRIORITY;209 /* Convey group of the VF */210 mbx.data = cptvf->priority;211 212 return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);213}214 215/*216 * Communicate to PF that VF is UP and running217 */218int otx_cptvf_send_vf_up(struct otx_cptvf *cptvf)219{220 struct otx_cpt_mbox mbx = {};221 222 mbx.msg = OTX_CPT_MSG_VF_UP;223 224 return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);225}226 227/*228 * Communicate to PF that VF is DOWN and running229 */230int otx_cptvf_send_vf_down(struct otx_cptvf *cptvf)231{232 struct otx_cpt_mbox mbx = {};233 234 mbx.msg = OTX_CPT_MSG_VF_DOWN;235 236 return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);237}238