// SPDX-License-Identifier: GPL-2.0
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/* Marvell OcteonTX CPT driver
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*
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* Copyright (C) 2019 Marvell International Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/delay.h>
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#include "otx_cptvf.h"
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#define CPT_MBOX_MSG_TIMEOUT 2000
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static char *get_mbox_opcode_str(int msg_opcode)
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{
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char *str = "Unknown";
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switch (msg_opcode) {
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case OTX_CPT_MSG_VF_UP:
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str = "UP";
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break;
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case OTX_CPT_MSG_VF_DOWN:
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str = "DOWN";
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break;
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case OTX_CPT_MSG_READY:
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str = "READY";
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break;
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case OTX_CPT_MSG_QLEN:
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str = "QLEN";
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break;
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case OTX_CPT_MSG_QBIND_GRP:
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str = "QBIND_GRP";
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break;
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case OTX_CPT_MSG_VQ_PRIORITY:
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str = "VQ_PRIORITY";
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break;
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case OTX_CPT_MSG_PF_TYPE:
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str = "PF_TYPE";
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break;
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case OTX_CPT_MSG_ACK:
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str = "ACK";
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break;
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case OTX_CPT_MSG_NACK:
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str = "NACK";
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break;
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}
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return str;
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}
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static void dump_mbox_msg(struct otx_cpt_mbox *mbox_msg, int vf_id)
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{
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char raw_data_str[OTX_CPT_MAX_MBOX_DATA_STR_SIZE];
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hex_dump_to_buffer(mbox_msg, sizeof(struct otx_cpt_mbox), 16, 8,
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raw_data_str, OTX_CPT_MAX_MBOX_DATA_STR_SIZE, false);
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if (vf_id >= 0)
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pr_debug("MBOX msg %s received from VF%d raw_data %s",
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get_mbox_opcode_str(mbox_msg->msg), vf_id,
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raw_data_str);
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else
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pr_debug("MBOX msg %s received from PF raw_data %s",
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get_mbox_opcode_str(mbox_msg->msg), raw_data_str);
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}
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static void cptvf_send_msg_to_pf(struct otx_cptvf *cptvf,
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struct otx_cpt_mbox *mbx)
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{
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/* Writing mbox(1) causes interrupt */
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writeq(mbx->msg, cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 0));
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writeq(mbx->data, cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 1));
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}
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/* Interrupt handler to handle mailbox messages from VFs */
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void otx_cptvf_handle_mbox_intr(struct otx_cptvf *cptvf)
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{
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struct otx_cpt_mbox mbx = {};
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/*
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* MBOX[0] contains msg
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* MBOX[1] contains data
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*/
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mbx.msg = readq(cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 0));
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mbx.data = readq(cptvf->reg_base + OTX_CPT_VFX_PF_MBOXX(0, 1));
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dump_mbox_msg(&mbx, -1);
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switch (mbx.msg) {
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case OTX_CPT_MSG_VF_UP:
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cptvf->pf_acked = true;
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cptvf->num_vfs = mbx.data;
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break;
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case OTX_CPT_MSG_READY:
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cptvf->pf_acked = true;
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cptvf->vfid = mbx.data;
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dev_dbg(&cptvf->pdev->dev, "Received VFID %d\n", cptvf->vfid);
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break;
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case OTX_CPT_MSG_QBIND_GRP:
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cptvf->pf_acked = true;
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cptvf->vftype = mbx.data;
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dev_dbg(&cptvf->pdev->dev, "VF %d type %s group %d\n",
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cptvf->vfid,
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((mbx.data == OTX_CPT_SE_TYPES) ? "SE" : "AE"),
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cptvf->vfgrp);
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break;
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case OTX_CPT_MSG_ACK:
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cptvf->pf_acked = true;
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break;
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case OTX_CPT_MSG_NACK:
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cptvf->pf_nacked = true;
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break;
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default:
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dev_err(&cptvf->pdev->dev, "Invalid msg from PF, msg 0x%llx\n",
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mbx.msg);
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break;
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}
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}
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static int cptvf_send_msg_to_pf_timeout(struct otx_cptvf *cptvf,
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struct otx_cpt_mbox *mbx)
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{
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int timeout = CPT_MBOX_MSG_TIMEOUT;
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int sleep = 10;
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cptvf->pf_acked = false;
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cptvf->pf_nacked = false;
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cptvf_send_msg_to_pf(cptvf, mbx);
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/* Wait for previous message to be acked, timeout 2sec */
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while (!cptvf->pf_acked) {
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if (cptvf->pf_nacked)
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return -EINVAL;
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msleep(sleep);
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if (cptvf->pf_acked)
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break;
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timeout -= sleep;
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if (!timeout) {
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dev_err(&cptvf->pdev->dev,
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"PF didn't ack to mbox msg %llx from VF%u\n",
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mbx->msg, cptvf->vfid);
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return -EBUSY;
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}
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}
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return 0;
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}
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/*
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* Checks if VF is able to comminicate with PF
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* and also gets the CPT number this VF is associated to.
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*/
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int otx_cptvf_check_pf_ready(struct otx_cptvf *cptvf)
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{
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struct otx_cpt_mbox mbx = {};
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int ret;
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mbx.msg = OTX_CPT_MSG_READY;
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ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
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return ret;
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}
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/*
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* Communicate VQs size to PF to program CPT(0)_PF_Q(0-15)_CTL of the VF.
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* Must be ACKed.
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*/
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int otx_cptvf_send_vq_size_msg(struct otx_cptvf *cptvf)
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{
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struct otx_cpt_mbox mbx = {};
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int ret;
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mbx.msg = OTX_CPT_MSG_QLEN;
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mbx.data = cptvf->qsize;
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ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
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return ret;
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}
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/*
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* Communicate VF group required to PF and get the VQ binded to that group
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*/
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int otx_cptvf_send_vf_to_grp_msg(struct otx_cptvf *cptvf, int group)
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{
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struct otx_cpt_mbox mbx = {};
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int ret;
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mbx.msg = OTX_CPT_MSG_QBIND_GRP;
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/* Convey group of the VF */
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mbx.data = group;
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ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
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if (ret)
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return ret;
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cptvf->vfgrp = group;
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return 0;
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}
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/*
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* Communicate VF group required to PF and get the VQ binded to that group
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*/
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int otx_cptvf_send_vf_priority_msg(struct otx_cptvf *cptvf)
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{
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struct otx_cpt_mbox mbx = {};
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int ret;
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mbx.msg = OTX_CPT_MSG_VQ_PRIORITY;
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/* Convey group of the VF */
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mbx.data = cptvf->priority;
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ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
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return ret;
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}
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/*
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* Communicate to PF that VF is UP and running
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*/
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int otx_cptvf_send_vf_up(struct otx_cptvf *cptvf)
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{
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struct otx_cpt_mbox mbx = {};
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int ret;
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mbx.msg = OTX_CPT_MSG_VF_UP;
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ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
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return ret;
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}
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/*
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* Communicate to PF that VF is DOWN and running
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*/
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int otx_cptvf_send_vf_down(struct otx_cptvf *cptvf)
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{
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struct otx_cpt_mbox mbx = {};
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int ret;
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mbx.msg = OTX_CPT_MSG_VF_DOWN;
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ret = cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
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return ret;
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}
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