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// 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 = {};
mbx.msg = OTX_CPT_MSG_READY;
return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
}
/*
* 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 = {};
mbx.msg = OTX_CPT_MSG_QLEN;
mbx.data = cptvf->qsize;
return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
}
/*
* 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 = {};
mbx.msg = OTX_CPT_MSG_VQ_PRIORITY;
/* Convey group of the VF */
mbx.data = cptvf->priority;
return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
}
/*
* Communicate to PF that VF is UP and running
*/
int otx_cptvf_send_vf_up(struct otx_cptvf *cptvf)
{
struct otx_cpt_mbox mbx = {};
mbx.msg = OTX_CPT_MSG_VF_UP;
return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
}
/*
* Communicate to PF that VF is DOWN and running
*/
int otx_cptvf_send_vf_down(struct otx_cptvf *cptvf)
{
struct otx_cpt_mbox mbx = {};
mbx.msg = OTX_CPT_MSG_VF_DOWN;
return cptvf_send_msg_to_pf_timeout(cptvf, &mbx);
}
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