// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021, MediaTek Inc.
* Copyright (c) 2021-2022, Intel Corporation.
* Copyright (c) 2024, Fibocom Wireless Inc.
*
* Authors:
* Amir Hanania <[email protected]>
* Chandrashekar Devegowda <[email protected]>
* Haijun Liu <[email protected]>
* Moises Veleta <[email protected]>
* Ricardo Martinez <[email protected]>
*
* Contributors:
* Andy Shevchenko <[email protected]>
* Chiranjeevi Rapolu <[email protected]>
* Eliot Lee <[email protected]>
* Sreehari Kancharla <[email protected]>
* Jinjian Song <[email protected]>
*/
#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_wwan_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_wwan_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_fastboot_tx(struct t7xx_port *port, struct sk_buff *skb)
{
struct sk_buff *cur = skb, *tx_skb;
size_t actual, len, offset = 0;
int txq_mtu;
int ret;
txq_mtu = t7xx_get_port_mtu(port);
if (txq_mtu < 0)
return -EINVAL;
actual = cur->len;
while (actual) {
len = min_t(size_t, actual, txq_mtu);
tx_skb = __dev_alloc_skb(len, GFP_KERNEL);
if (!tx_skb)
return -ENOMEM;
skb_put_data(tx_skb, cur->data + offset, len);
ret = t7xx_port_send_raw_skb(port, tx_skb);
if (ret) {
dev_kfree_skb(tx_skb);
dev_err(port->dev, "Write error on fastboot port, %d\n", ret);
break;
}
offset += len;
actual -= len;
}
dev_kfree_skb(skb);
return 0;
}
static int t7xx_port_ctrl_tx(struct t7xx_port *port, struct sk_buff *skb)
{
const struct t7xx_port_conf *port_conf;
struct sk_buff *cur = skb, *cloned;
struct t7xx_fsm_ctl *ctl;
enum md_state md_state;
int cnt = 0, ret;
port_conf = port->port_conf;
ctl = port->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->dev, "Cannot write to %s port when md_state=%d\n",
port_conf->name, md_state);
return -ENODEV;
}
while (cur) {
cloned = skb_clone(cur, GFP_KERNEL);
cloned->len = skb_headlen(cur);
ret = t7xx_port_send_skb(port, cloned, 0, 0);
if (ret) {
dev_kfree_skb(cloned);
dev_err(port->dev, "Write error on %s port, %d\n",
port_conf->name, ret);
return cnt ? cnt + ret : ret;
}
cnt += cur->len;
if (cur == skb)
cur = skb_shinfo(skb)->frag_list;
else
cur = cur->next;
}
dev_kfree_skb(skb);
return 0;
}
static int t7xx_port_wwan_tx(struct wwan_port *port, struct sk_buff *skb)
{
struct t7xx_port *port_private = wwan_port_get_drvdata(port);
const struct t7xx_port_conf *port_conf = port_private->port_conf;
int ret;
if (!port_private->chan_enable)
return -EINVAL;
if (port_conf->port_type != WWAN_PORT_FASTBOOT)
ret = t7xx_port_ctrl_tx(port_private, skb);
else
ret = t7xx_port_fastboot_tx(port_private, skb);
return ret;
}
static const struct wwan_port_ops wwan_ops = {
.start = t7xx_port_wwan_start,
.stop = t7xx_port_wwan_stop,
.tx = t7xx_port_wwan_tx,
};
static void t7xx_port_wwan_create(struct t7xx_port *port)
{
const struct t7xx_port_conf *port_conf = port->port_conf;
unsigned int header_len = sizeof(struct ccci_header), mtu;
struct wwan_port_caps caps;
if (!port->wwan.wwan_port) {
mtu = t7xx_get_port_mtu(port);
caps.frag_len = mtu - header_len;
caps.headroom_len = header_len;
port->wwan.wwan_port = wwan_create_port(port->dev, port_conf->port_type,
&wwan_ops, &caps, port);
if (IS_ERR(port->wwan.wwan_port))
dev_err(port->dev, "Unable to create WWAN port %s", port_conf->name);
}
}
static int t7xx_port_wwan_init(struct t7xx_port *port)
{
const struct t7xx_port_conf *port_conf = port->port_conf;
if (port_conf->port_type == WWAN_PORT_FASTBOOT)
t7xx_port_wwan_create(port);
port->rx_length_th = RX_QUEUE_MAXLEN;
return 0;
}
static void t7xx_port_wwan_uninit(struct t7xx_port *port)
{
if (!port->wwan.wwan_port)
return;
port->rx_length_th = 0;
wwan_remove_port(port->wwan.wwan_port);
port->wwan.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.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 (port_conf->port_type == WWAN_PORT_FASTBOOT)
return;
if (state != MD_STATE_READY)
return;
t7xx_port_wwan_create(port);
}
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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