1 /*-
2 * Copyright (c) 2003, 2004 Marcel Moolenaar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 #ifndef _DEV_UART_CPU_H_
30 #define _DEV_UART_CPU_H_
31
32 #include <sys/kdb.h>
33 #include <sys/lock.h>
34 #include <sys/mutex.h>
35
36 struct uart_softc;
37
38 /*
39 * Low-level operations for use by console and/or debug port support.
40 */
41 struct uart_ops {
42 int (*probe)(struct uart_bas *);
43 void (*init)(struct uart_bas *, int, int, int, int);
44 void (*term)(struct uart_bas *);
45 void (*putc)(struct uart_bas *, int);
46 int (*rxready)(struct uart_bas *);
47 int (*getc)(struct uart_bas *, struct mtx *);
48 };
49
50 extern bus_space_tag_t uart_bus_space_io;
51 extern bus_space_tag_t uart_bus_space_mem;
52
53 /*
54 * Console and debug port device info.
55 */
56 struct uart_devinfo {
57 SLIST_ENTRY(uart_devinfo) next;
58 struct uart_ops *ops;
59 struct uart_bas bas;
60 int baudrate;
61 int databits;
62 int stopbits;
63 int parity;
64 int type;
65 #define UART_DEV_CONSOLE 0
66 #define UART_DEV_DBGPORT 1
67 #define UART_DEV_KEYBOARD 2
68 int (*attach)(struct uart_softc*);
69 int (*detach)(struct uart_softc*);
70 void *cookie; /* Type dependent use. */
71 struct mtx *hwmtx;
72 struct uart_softc *sc; /* valid only from start of attach */
73 };
74
75 int uart_cpu_eqres(struct uart_bas *, struct uart_bas *);
76 int uart_cpu_getdev(int, struct uart_devinfo *);
77
78 int uart_getenv(int, struct uart_devinfo *, struct uart_class *);
79 const char *uart_getname(struct uart_class *);
80 struct uart_ops *uart_getops(struct uart_class *);
81 int uart_getrange(struct uart_class *);
82 u_int uart_getregshift(struct uart_class *);
83 u_int uart_getregiowidth(struct uart_class *);
84
85 void uart_add_sysdev(struct uart_devinfo *);
86
87 /*
88 * Operations for low-level access to the UART. Primarily for use
89 * by console and debug port logic.
90 */
91
92 static __inline void
uart_lock(struct mtx * hwmtx)93 uart_lock(struct mtx *hwmtx)
94 {
95 if (!kdb_active && hwmtx != NULL)
96 mtx_lock_spin(hwmtx);
97 }
98
99 static __inline void
uart_unlock(struct mtx * hwmtx)100 uart_unlock(struct mtx *hwmtx)
101 {
102 if (!kdb_active && hwmtx != NULL)
103 mtx_unlock_spin(hwmtx);
104 }
105
106 static __inline int
uart_probe(struct uart_devinfo * di)107 uart_probe(struct uart_devinfo *di)
108 {
109 int res;
110
111 uart_lock(di->hwmtx);
112 res = di->ops->probe(&di->bas);
113 uart_unlock(di->hwmtx);
114 return (res);
115 }
116
117 static __inline void
uart_init(struct uart_devinfo * di)118 uart_init(struct uart_devinfo *di)
119 {
120 uart_lock(di->hwmtx);
121 di->ops->init(&di->bas, di->baudrate, di->databits, di->stopbits,
122 di->parity);
123 uart_unlock(di->hwmtx);
124 }
125
126 static __inline void
uart_term(struct uart_devinfo * di)127 uart_term(struct uart_devinfo *di)
128 {
129 uart_lock(di->hwmtx);
130 di->ops->term(&di->bas);
131 uart_unlock(di->hwmtx);
132 }
133
134 static __inline void
uart_putc(struct uart_devinfo * di,int c)135 uart_putc(struct uart_devinfo *di, int c)
136 {
137 uart_lock(di->hwmtx);
138 di->ops->putc(&di->bas, c);
139 uart_unlock(di->hwmtx);
140 }
141
142 static __inline int
uart_rxready(struct uart_devinfo * di)143 uart_rxready(struct uart_devinfo *di)
144 {
145 int res;
146
147 uart_lock(di->hwmtx);
148 res = di->ops->rxready(&di->bas);
149 uart_unlock(di->hwmtx);
150 return (res);
151 }
152
153 static __inline int
uart_poll(struct uart_devinfo * di)154 uart_poll(struct uart_devinfo *di)
155 {
156 int res;
157
158 uart_lock(di->hwmtx);
159 if (di->ops->rxready(&di->bas))
160 res = di->ops->getc(&di->bas, NULL);
161 else
162 res = -1;
163 uart_unlock(di->hwmtx);
164 return (res);
165 }
166
167 static __inline int
uart_getc(struct uart_devinfo * di)168 uart_getc(struct uart_devinfo *di)
169 {
170
171 return (di->ops->getc(&di->bas, di->hwmtx));
172 }
173
174 void uart_grab(struct uart_devinfo *di);
175 void uart_ungrab(struct uart_devinfo *di);
176
177 #endif /* _DEV_UART_CPU_H_ */
178