1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _HVSI_H
3 #define _HVSI_H
4 
5 #define VS_DATA_PACKET_HEADER           0xff
6 #define VS_CONTROL_PACKET_HEADER        0xfe
7 #define VS_QUERY_PACKET_HEADER          0xfd
8 #define VS_QUERY_RESPONSE_PACKET_HEADER 0xfc
9 
10 /* control verbs */
11 #define VSV_SET_MODEM_CTL    1 /* to service processor only */
12 #define VSV_MODEM_CTL_UPDATE 2 /* from service processor only */
13 #define VSV_CLOSE_PROTOCOL   3
14 
15 /* query verbs */
16 #define VSV_SEND_VERSION_NUMBER 1
17 #define VSV_SEND_MODEM_CTL_STATUS 2
18 
19 /* yes, these masks are not consecutive. */
20 #define HVSI_TSDTR 0x01
21 #define HVSI_TSCD  0x20
22 
23 #define HVSI_MAX_OUTGOING_DATA 12
24 #define HVSI_VERSION 1
25 
26 struct hvsi_header {
27 	uint8_t  type;
28 	uint8_t  len;
29 	__be16 seqno;
30 } __attribute__((packed));
31 
32 struct hvsi_data {
33 	struct hvsi_header hdr;
34 	uint8_t  data[HVSI_MAX_OUTGOING_DATA];
35 } __attribute__((packed));
36 
37 struct hvsi_control {
38 	struct hvsi_header hdr;
39 	__be16 verb;
40 	/* optional depending on verb: */
41 	__be32 word;
42 	__be32 mask;
43 } __attribute__((packed));
44 
45 struct hvsi_query {
46 	struct hvsi_header hdr;
47 	__be16 verb;
48 } __attribute__((packed));
49 
50 struct hvsi_query_response {
51 	struct hvsi_header hdr;
52 	__be16 verb;
53 	__be16 query_seqno;
54 	union {
55 		uint8_t  version;
56 		__be32 mctrl_word;
57 	} u;
58 } __attribute__((packed));
59 
60 /* hvsi lib struct definitions */
61 #define HVSI_INBUF_SIZE		255
62 struct tty_struct;
63 struct hvsi_priv {
64 	unsigned int	inbuf_len;	/* data in input buffer */
65 	unsigned char	inbuf[HVSI_INBUF_SIZE];
66 	unsigned int	inbuf_cur;	/* Cursor in input buffer */
67 	unsigned int	inbuf_pktlen;	/* packet length from cursor */
68 	atomic_t	seqno;		/* packet sequence number */
69 	unsigned int	opened:1;	/* driver opened */
70 	unsigned int	established:1;	/* protocol established */
71 	unsigned int 	is_console:1;	/* used as a kernel console device */
72 	unsigned int	mctrl_update:1;	/* modem control updated */
73 	unsigned short	mctrl;		/* modem control */
74 	struct tty_struct *tty;		/* tty structure */
75 	int (*get_chars)(uint32_t termno, char *buf, int count);
76 	int (*put_chars)(uint32_t termno, const char *buf, int count);
77 	uint32_t	termno;
78 };
79 
80 /* hvsi lib functions */
81 struct hvc_struct;
82 extern void hvsilib_init(struct hvsi_priv *pv,
83 			 int (*get_chars)(uint32_t termno, char *buf, int count),
84 			 int (*put_chars)(uint32_t termno, const char *buf,
85 					  int count),
86 			 int termno, int is_console);
87 extern int hvsilib_open(struct hvsi_priv *pv, struct hvc_struct *hp);
88 extern void hvsilib_close(struct hvsi_priv *pv, struct hvc_struct *hp);
89 extern int hvsilib_read_mctrl(struct hvsi_priv *pv);
90 extern int hvsilib_write_mctrl(struct hvsi_priv *pv, int dtr);
91 extern void hvsilib_establish(struct hvsi_priv *pv);
92 extern int hvsilib_get_chars(struct hvsi_priv *pv, char *buf, int count);
93 extern int hvsilib_put_chars(struct hvsi_priv *pv, const char *buf, int count);
94 
95 #endif /* _HVSI_H */
96