Orange Pi5 kernel

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