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) */