uart_cpu.h revision 256281
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: stable/10/sys/dev/uart/uart_cpu.h 168281 2007-04-02 22:00:22Z marcel $ 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/* 37 * Low-level operations for use by console and/or debug port support. 38 */ 39struct uart_ops { 40 int (*probe)(struct uart_bas *); 41 void (*init)(struct uart_bas *, int, int, int, int); 42 void (*term)(struct uart_bas *); 43 void (*putc)(struct uart_bas *, int); 44 int (*rxready)(struct uart_bas *); 45 int (*getc)(struct uart_bas *, struct mtx *); 46}; 47 48extern bus_space_tag_t uart_bus_space_io; 49extern bus_space_tag_t uart_bus_space_mem; 50 51/* 52 * Console and debug port device info. 53 */ 54struct uart_softc; 55struct uart_devinfo { 56 SLIST_ENTRY(uart_devinfo) next; 57 struct uart_ops *ops; 58 struct uart_bas bas; 59 int baudrate; 60 int databits; 61 int stopbits; 62 int parity; 63 int type; 64#define UART_DEV_CONSOLE 0 65#define UART_DEV_DBGPORT 1 66#define UART_DEV_KEYBOARD 2 67 int (*attach)(struct uart_softc*); 68 int (*detach)(struct uart_softc*); 69 void *cookie; /* Type dependent use. */ 70 struct mtx *hwmtx; 71}; 72 73int uart_cpu_eqres(struct uart_bas *, struct uart_bas *); 74int uart_cpu_getdev(int, struct uart_devinfo *); 75 76int uart_getenv(int, struct uart_devinfo *, struct uart_class *); 77const char *uart_getname(struct uart_class *); 78struct uart_ops *uart_getops(struct uart_class *); 79int uart_getrange(struct uart_class *); 80 81void uart_add_sysdev(struct uart_devinfo *); 82 83/* 84 * Operations for low-level access to the UART. Primarily for use 85 * by console and debug port logic. 86 */ 87 88static __inline void 89uart_lock(struct mtx *hwmtx) 90{ 91 if (!kdb_active && hwmtx != NULL) 92 mtx_lock_spin(hwmtx); 93} 94 95static __inline void 96uart_unlock(struct mtx *hwmtx) 97{ 98 if (!kdb_active && hwmtx != NULL) 99 mtx_unlock_spin(hwmtx); 100} 101 102static __inline int 103uart_probe(struct uart_devinfo *di) 104{ 105 int res; 106 107 uart_lock(di->hwmtx); 108 res = di->ops->probe(&di->bas); 109 uart_unlock(di->hwmtx); 110 return (res); 111} 112 113static __inline void 114uart_init(struct uart_devinfo *di) 115{ 116 uart_lock(di->hwmtx); 117 di->ops->init(&di->bas, di->baudrate, di->databits, di->stopbits, 118 di->parity); 119 uart_unlock(di->hwmtx); 120} 121 122static __inline void 123uart_term(struct uart_devinfo *di) 124{ 125 uart_lock(di->hwmtx); 126 di->ops->term(&di->bas); 127 uart_unlock(di->hwmtx); 128} 129 130static __inline void 131uart_putc(struct uart_devinfo *di, int c) 132{ 133 uart_lock(di->hwmtx); 134 di->ops->putc(&di->bas, c); 135 uart_unlock(di->hwmtx); 136} 137 138static __inline int 139uart_rxready(struct uart_devinfo *di) 140{ 141 int res; 142 143 uart_lock(di->hwmtx); 144 res = di->ops->rxready(&di->bas); 145 uart_unlock(di->hwmtx); 146 return (res); 147} 148 149static __inline int 150uart_poll(struct uart_devinfo *di) 151{ 152 int res; 153 154 uart_lock(di->hwmtx); 155 if (di->ops->rxready(&di->bas)) 156 res = di->ops->getc(&di->bas, NULL); 157 else 158 res = -1; 159 uart_unlock(di->hwmtx); 160 return (res); 161} 162 163static __inline int 164uart_getc(struct uart_devinfo *di) 165{ 166 167 return (di->ops->getc(&di->bas, di->hwmtx)); 168} 169 170#endif /* _DEV_UART_CPU_H_ */ 171