xref: /openbmc/linux/drivers/net/wwan/t7xx/t7xx_port.h (revision ba2274dc)
1 /* SPDX-License-Identifier: GPL-2.0-only
2  *
3  * Copyright (c) 2021, MediaTek Inc.
4  * Copyright (c) 2021-2022, Intel Corporation.
5  *
6  * Authors:
7  *  Haijun Liu <haijun.liu@mediatek.com>
8  *  Moises Veleta <moises.veleta@intel.com>
9  *  Ricardo Martinez <ricardo.martinez@linux.intel.com>
10  *
11  * Contributors:
12  *  Amir Hanania <amir.hanania@intel.com>
13  *  Andy Shevchenko <andriy.shevchenko@linux.intel.com>
14  *  Chandrashekar Devegowda <chandrashekar.devegowda@intel.com>
15  *  Eliot Lee <eliot.lee@intel.com>
16  */
17 
18 #ifndef __T7XX_PORT_H__
19 #define __T7XX_PORT_H__
20 
21 #include <linux/bits.h>
22 #include <linux/device.h>
23 #include <linux/mutex.h>
24 #include <linux/sched.h>
25 #include <linux/skbuff.h>
26 #include <linux/spinlock.h>
27 #include <linux/types.h>
28 #include <linux/wait.h>
29 #include <linux/wwan.h>
30 
31 #include "t7xx_hif_cldma.h"
32 #include "t7xx_pci.h"
33 
34 #define PORT_CH_ID_MASK		GENMASK(7, 0)
35 
36 /* Channel ID and Message ID definitions.
37  * The channel number consists of peer_id(15:12) , channel_id(11:0)
38  * peer_id:
39  * 0:reserved, 1: to AP, 2: to MD
40  */
41 enum port_ch {
42 	/* to AP */
43 	PORT_CH_AP_CONTROL_RX = 0x1000,
44 	PORT_CH_AP_CONTROL_TX = 0x1001,
45 
46 	/* to MD */
47 	PORT_CH_CONTROL_RX = 0x2000,
48 	PORT_CH_CONTROL_TX = 0x2001,
49 	PORT_CH_UART1_RX = 0x2006,	/* META */
50 	PORT_CH_UART1_TX = 0x2008,
51 	PORT_CH_UART2_RX = 0x200a,	/* AT */
52 	PORT_CH_UART2_TX = 0x200c,
53 	PORT_CH_MD_LOG_RX = 0x202a,	/* MD logging */
54 	PORT_CH_MD_LOG_TX = 0x202b,
55 	PORT_CH_LB_IT_RX = 0x203e,	/* Loop back test */
56 	PORT_CH_LB_IT_TX = 0x203f,
57 	PORT_CH_STATUS_RX = 0x2043,	/* Status events */
58 	PORT_CH_MIPC_RX = 0x20ce,	/* MIPC */
59 	PORT_CH_MIPC_TX = 0x20cf,
60 	PORT_CH_MBIM_RX = 0x20d0,
61 	PORT_CH_MBIM_TX = 0x20d1,
62 	PORT_CH_DSS0_RX = 0x20d2,
63 	PORT_CH_DSS0_TX = 0x20d3,
64 	PORT_CH_DSS1_RX = 0x20d4,
65 	PORT_CH_DSS1_TX = 0x20d5,
66 	PORT_CH_DSS2_RX = 0x20d6,
67 	PORT_CH_DSS2_TX = 0x20d7,
68 	PORT_CH_DSS3_RX = 0x20d8,
69 	PORT_CH_DSS3_TX = 0x20d9,
70 	PORT_CH_DSS4_RX = 0x20da,
71 	PORT_CH_DSS4_TX = 0x20db,
72 	PORT_CH_DSS5_RX = 0x20dc,
73 	PORT_CH_DSS5_TX = 0x20dd,
74 	PORT_CH_DSS6_RX = 0x20de,
75 	PORT_CH_DSS6_TX = 0x20df,
76 	PORT_CH_DSS7_RX = 0x20e0,
77 	PORT_CH_DSS7_TX = 0x20e1,
78 };
79 
80 struct t7xx_port;
81 struct port_ops {
82 	int (*init)(struct t7xx_port *port);
83 	int (*recv_skb)(struct t7xx_port *port, struct sk_buff *skb);
84 	void (*md_state_notify)(struct t7xx_port *port, unsigned int md_state);
85 	void (*uninit)(struct t7xx_port *port);
86 	int (*enable_chl)(struct t7xx_port *port);
87 	int (*disable_chl)(struct t7xx_port *port);
88 };
89 
90 struct t7xx_port_conf {
91 	enum port_ch		tx_ch;
92 	enum port_ch		rx_ch;
93 	unsigned char		txq_index;
94 	unsigned char		rxq_index;
95 	unsigned char		txq_exp_index;
96 	unsigned char		rxq_exp_index;
97 	enum cldma_id		path_id;
98 	struct port_ops		*ops;
99 	char			*name;
100 	enum wwan_port_type	port_type;
101 };
102 
103 struct t7xx_port {
104 	/* Members not initialized in definition */
105 	const struct t7xx_port_conf	*port_conf;
106 	struct t7xx_pci_dev		*t7xx_dev;
107 	struct device			*dev;
108 	u16				seq_nums[2];	/* TX/RX sequence numbers */
109 	atomic_t			usage_cnt;
110 	struct				list_head entry;
111 	struct				list_head queue_entry;
112 	/* TX and RX flows are asymmetric since ports are multiplexed on
113 	 * queues.
114 	 *
115 	 * TX: data blocks are sent directly to a queue. Each port
116 	 * does not maintain a TX list; instead, they only provide
117 	 * a wait_queue_head for blocking writes.
118 	 *
119 	 * RX: Each port uses a RX list to hold packets,
120 	 * allowing the modem to dispatch RX packet as quickly as possible.
121 	 */
122 	struct sk_buff_head		rx_skb_list;
123 	spinlock_t			port_update_lock; /* Protects port configuration */
124 	wait_queue_head_t		rx_wq;
125 	int				rx_length_th;
126 	bool				chan_enable;
127 	struct task_struct		*thread;
128 	union {
129 		struct {
130 			struct wwan_port		*wwan_port;
131 		} wwan;
132 		struct {
133 			struct rchan			*relaych;
134 		} log;
135 	};
136 };
137 
138 struct sk_buff *t7xx_port_alloc_skb(int payload);
139 struct sk_buff *t7xx_ctrl_alloc_skb(int payload);
140 int t7xx_port_enqueue_skb(struct t7xx_port *port, struct sk_buff *skb);
141 int t7xx_port_send_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int pkt_header,
142 		       unsigned int ex_msg);
143 int t7xx_port_send_ctl_skb(struct t7xx_port *port, struct sk_buff *skb, unsigned int msg,
144 			   unsigned int ex_msg);
145 
146 #endif /* __T7XX_PORT_H__ */
147