FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart_cpu.h

     /*-
      * Copyright (c) 2003, 2004 Marcel Moolenaar
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      *
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _DEV_UART_CPU_H_
    #define _DEV_UART_CPU_H_
    
    #include <sys/kdb.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    
    /*
     * Low-level operations for use by console and/or debug port support.
     */
    struct uart_ops {
            int (*probe)(struct uart_bas *);
            void (*init)(struct uart_bas *, int, int, int, int);
            void (*term)(struct uart_bas *);
            void (*putc)(struct uart_bas *, int);
            int (*rxready)(struct uart_bas *);
            int (*getc)(struct uart_bas *, struct mtx *);
    };
    
    extern bus_space_tag_t uart_bus_space_io;
    extern bus_space_tag_t uart_bus_space_mem;
    
    /*
     * Console and debug port device info.
     */
    struct uart_softc;
    struct uart_devinfo {
            SLIST_ENTRY(uart_devinfo) next;
            struct uart_ops *ops;
            struct uart_bas bas;
            int     baudrate;
            int     databits;
            int     stopbits;
            int     parity;
            int     type;
    #define UART_DEV_CONSOLE        0
    #define UART_DEV_DBGPORT        1
    #define UART_DEV_KEYBOARD       2
            int     (*attach)(struct uart_softc*);
            int     (*detach)(struct uart_softc*);
            void    *cookie;                /* Type dependent use. */
            struct mtx *hwmtx;
    };
    
    int uart_cpu_eqres(struct uart_bas *, struct uart_bas *);
    int uart_cpu_getdev(int, struct uart_devinfo *);
    
    int uart_getenv(int, struct uart_devinfo *, struct uart_class *);
    const char *uart_getname(struct uart_class *);
    struct uart_ops *uart_getops(struct uart_class *);
    int uart_getrange(struct uart_class *);
    
    void uart_add_sysdev(struct uart_devinfo *);
    
    /*
     * Operations for low-level access to the UART. Primarily for use
     * by console and debug port logic.
     */
    
    static __inline void
    uart_lock(struct mtx *hwmtx)
    {
            if (!kdb_active && hwmtx != NULL)
                    mtx_lock_spin(hwmtx);
    }
    
    static __inline void
    uart_unlock(struct mtx *hwmtx)
    {
            if (!kdb_active && hwmtx != NULL)
                    mtx_unlock_spin(hwmtx);
   }
   
   static __inline int
   uart_probe(struct uart_devinfo *di)
   {
           int res;
   
           uart_lock(di->hwmtx);
           res = di->ops->probe(&di->bas);
           uart_unlock(di->hwmtx);
           return (res);
   }
   
   static __inline void
   uart_init(struct uart_devinfo *di)
   {
           uart_lock(di->hwmtx);
           di->ops->init(&di->bas, di->baudrate, di->databits, di->stopbits,
               di->parity);
           uart_unlock(di->hwmtx);
   }
   
   static __inline void
   uart_term(struct uart_devinfo *di)
   {
           uart_lock(di->hwmtx);
           di->ops->term(&di->bas);
           uart_unlock(di->hwmtx);
   }
   
   static __inline void
   uart_putc(struct uart_devinfo *di, int c)
   {
           uart_lock(di->hwmtx);
           di->ops->putc(&di->bas, c);
           uart_unlock(di->hwmtx);
   }
   
   static __inline int
   uart_rxready(struct uart_devinfo *di)
   {
           int res;
   
           uart_lock(di->hwmtx);
           res = di->ops->rxready(&di->bas);
           uart_unlock(di->hwmtx);
           return (res);
   }
   
   static __inline int
   uart_poll(struct uart_devinfo *di)
   {
           int res;
   
           uart_lock(di->hwmtx);
           if (di->ops->rxready(&di->bas))
                   res = di->ops->getc(&di->bas, NULL);
           else
                   res = -1;
           uart_unlock(di->hwmtx);
           return (res);
   }
   
   static __inline int
   uart_getc(struct uart_devinfo *di)
   {
   
           return (di->ops->getc(&di->bas, di->hwmtx));
   }
   
   #endif /* _DEV_UART_CPU_H_ */

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