xref: /linux/include/linux/scc.h (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* $Id: scc.h,v 1.29 1997/04/02 14:56:45 jreuter Exp jreuter $ */
3 #ifndef	_SCC_H
4 #define	_SCC_H
5 
6 #include <uapi/linux/scc.h>
7 
8 
9 enum {TX_OFF, TX_ON};	/* command for scc_key_trx() */
10 
11 /* Vector masks in RR2B */
12 
13 #define VECTOR_MASK	0x06
14 #define TXINT		0x00
15 #define EXINT		0x02
16 #define RXINT		0x04
17 #define SPINT		0x06
18 
19 #ifdef CONFIG_SCC_DELAY
20 #define Inb(port)	inb_p(port)
21 #define Outb(port, val)	outb_p(val, port)
22 #else
23 #define Inb(port)	inb(port)
24 #define Outb(port, val)	outb(val, port)
25 #endif
26 
27 /* SCC channel control structure for KISS */
28 
29 struct scc_kiss {
30 	unsigned char txdelay;		/* Transmit Delay 10 ms/cnt */
31 	unsigned char persist;		/* Persistence (0-255) as a % */
32 	unsigned char slottime;		/* Delay to wait on persistence hit */
33 	unsigned char tailtime;		/* Delay after last byte written */
34 	unsigned char fulldup;		/* Full Duplex mode 0=CSMA 1=DUP 2=ALWAYS KEYED */
35 	unsigned char waittime;		/* Waittime before any transmit attempt */
36 	unsigned int  maxkeyup;		/* Maximum time to transmit (seconds) */
37 	unsigned int  mintime;		/* Minimal offtime after MAXKEYUP timeout (seconds) */
38 	unsigned int  idletime;		/* Maximum idle time in ALWAYS KEYED mode (seconds) */
39 	unsigned int  maxdefer;		/* Timer for CSMA channel busy limit */
40 	unsigned char tx_inhibit;	/* Transmit is not allowed when set */
41 	unsigned char group;		/* Group ID for AX.25 TX interlocking */
42 	unsigned char mode;		/* 'normal' or 'hwctrl' mode (unused) */
43 	unsigned char softdcd;		/* Use DPLL instead of DCD pin for carrier detect */
44 };
45 
46 
47 /* SCC channel structure */
48 
49 struct scc_channel {
50 	int init;			/* channel exists? */
51 
52 	struct net_device *dev;		/* link to device control structure */
53 	struct net_device_stats dev_stat;/* device statistics */
54 
55 	char brand;			/* manufacturer of the board */
56 	long clock;			/* used clock */
57 
58 	io_port ctrl;			/* I/O address of CONTROL register */
59 	io_port	data;			/* I/O address of DATA register */
60 	io_port special;		/* I/O address of special function port */
61 	int irq;			/* Number of Interrupt */
62 
63 	char option;
64 	char enhanced;			/* Enhanced SCC support */
65 
66 	unsigned char wreg[16]; 	/* Copy of last written value in WRx */
67 	unsigned char status;		/* Copy of R0 at last external interrupt */
68 	unsigned char dcd;		/* DCD status */
69 
70         struct scc_kiss kiss;		/* control structure for KISS params */
71         struct scc_stat stat;		/* statistical information */
72         struct scc_modem modem; 	/* modem information */
73 
74         struct sk_buff_head tx_queue;	/* next tx buffer */
75         struct sk_buff *rx_buff;	/* pointer to frame currently received */
76         struct sk_buff *tx_buff;	/* pointer to frame currently transmitted */
77 
78 	/* Timer */
79 	struct timer_list tx_t;		/* tx timer for this channel */
80 	struct timer_list tx_wdog;	/* tx watchdogs */
81 
82 	/* Channel lock */
83 	spinlock_t	lock;		/* Channel guard lock */
84 };
85 
86 #endif /* defined(_SCC_H) */
87