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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021, MediaTek Inc.
* Copyright (c) 2021-2022, Intel Corporation.
*
* Authors:
* Amir Hanania <amir.hanania@intel.com>
* Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
* Haijun Liu <haijun.liu@mediatek.com>
* Moises Veleta <moises.veleta@intel.com>
* Ricardo Martinez <ricardo.martinez@linux.intel.com>
*
* Contributors:
* Andy Shevchenko <andriy.shevchenko@linux.intel.com>
* Chiranjeevi Rapolu <chiranjeevi.rapolu@intel.com>
* Eliot Lee <eliot.lee@intel.com>
* Sreehari Kancharla <sreehari.kancharla@intel.com>
*/
#include <linux/atomic.h>
#include <linux/bitfield.h>
#include <linux/dev_printk.h>
#include <linux/err.h>
#include <linux/gfp.h>
#include <linux/minmax.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/wwan.h>
#include "t7xx_port.h"
#include "t7xx_port_proxy.h"
#include "t7xx_state_monitor.h"
static int t7xx_port_ctrl_start(struct wwan_port *port)
{
struct t7xx_port *port_mtk = wwan_port_get_drvdata(port);
if (atomic_read(&port_mtk->usage_cnt))
return -EBUSY;
atomic_inc(&port_mtk->usage_cnt);
return 0;
}
static void t7xx_port_ctrl_stop(struct wwan_port *port)
{
struct t7xx_port *port_mtk = wwan_port_get_drvdata(port);
atomic_dec(&port_mtk->usage_cnt);
}
static int t7xx_port_ctrl_tx(struct wwan_port *port, struct sk_buff *skb)
{
struct t7xx_port *port_private = wwan_port_get_drvdata(port);
size_t len, offset, chunk_len = 0, txq_mtu = CLDMA_MTU;
const struct t7xx_port_conf *port_conf;
struct t7xx_fsm_ctl *ctl;
enum md_state md_state;
len = skb->len;
if (!len || !port_private->chan_enable)
return -EINVAL;
port_conf = port_private->port_conf;
ctl = port_private->t7xx_dev->md->fsm_ctl;
md_state = t7xx_fsm_get_md_state(ctl);
if (md_state == MD_STATE_WAITING_FOR_HS1 || md_state == MD_STATE_WAITING_FOR_HS2) {
dev_warn(port_private->dev, "Cannot write to %s port when md_state=%d\n",
port_conf->name, md_state);
return -ENODEV;
}
for (offset = 0; offset < len; offset += chunk_len) {
struct sk_buff *skb_ccci;
int ret;
chunk_len = min(len - offset, txq_mtu - sizeof(struct ccci_header));
skb_ccci = t7xx_port_alloc_skb(chunk_len);
if (!skb_ccci)
return -ENOMEM;
skb_put_data(skb_ccci, skb->data + offset, chunk_len);
ret = t7xx_port_send_skb(port_private, skb_ccci, 0, 0);
if (ret) {
dev_kfree_skb_any(skb_ccci);
dev_err(port_private->dev, "Write error on %s port, %d\n",
port_conf->name, ret);
return ret;
}
}
dev_kfree_skb(skb);
return 0;
}
static const struct wwan_port_ops wwan_ops = {
.start = t7xx_port_ctrl_start,
.stop = t7xx_port_ctrl_stop,
.tx = t7xx_port_ctrl_tx,
};
static int t7xx_port_wwan_init(struct t7xx_port *port)
{
port->rx_length_th = RX_QUEUE_MAXLEN;
return 0;
}
static void t7xx_port_wwan_uninit(struct t7xx_port *port)
{
if (!port->wwan_port)
return;
port->rx_length_th = 0;
wwan_remove_port(port->wwan_port);
port->wwan_port = NULL;
}
static int t7xx_port_wwan_recv_skb(struct t7xx_port *port, struct sk_buff *skb)
{
if (!atomic_read(&port->usage_cnt) || !port->chan_enable) {
const struct t7xx_port_conf *port_conf = port->port_conf;
dev_kfree_skb_any(skb);
dev_err_ratelimited(port->dev, "Port %s is not opened, drop packets\n",
port_conf->name);
/* Dropping skb, caller should not access skb.*/
return 0;
}
wwan_port_rx(port->wwan_port, skb);
return 0;
}
static int t7xx_port_wwan_enable_chl(struct t7xx_port *port)
{
spin_lock(&port->port_update_lock);
port->chan_enable = true;
spin_unlock(&port->port_update_lock);
return 0;
}
static int t7xx_port_wwan_disable_chl(struct t7xx_port *port)
{
spin_lock(&port->port_update_lock);
port->chan_enable = false;
spin_unlock(&port->port_update_lock);
return 0;
}
static void t7xx_port_wwan_md_state_notify(struct t7xx_port *port, unsigned int state)
{
const struct t7xx_port_conf *port_conf = port->port_conf;
if (state != MD_STATE_READY)
return;
if (!port->wwan_port) {
port->wwan_port = wwan_create_port(port->dev, port_conf->port_type,
&wwan_ops, port);
if (IS_ERR(port->wwan_port))
dev_err(port->dev, "Unable to create WWWAN port %s", port_conf->name);
}
}
struct port_ops wwan_sub_port_ops = {
.init = t7xx_port_wwan_init,
.recv_skb = t7xx_port_wwan_recv_skb,
.uninit = t7xx_port_wwan_uninit,
.enable_chl = t7xx_port_wwan_enable_chl,
.disable_chl = t7xx_port_wwan_disable_chl,
.md_state_notify = t7xx_port_wwan_md_state_notify,
};
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