summaryrefslogtreecommitdiffstats
path: root/drivers/net/wwan/t7xx/t7xx_port_wwan.c
blob: 33931bfd78fdd7fe0c042c5ebfbe812a634f4a74 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
// 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,
};