The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/at91/uart_cpu_at91rm9200usart.c

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    1 /*-
    2  * Copyright (c) 2003 Marcel Moolenaar
    3  * Copyright (c) 2006 M. Warner Losh
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  *
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include "opt_uart.h"
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD: releng/8.1/sys/arm/at91/uart_cpu_at91rm9200usart.c 187602 2009-01-22 21:56:41Z imp $");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 #include <sys/cons.h>
   38 #include <sys/lock.h>
   39 #include <sys/mutex.h>
   40 #include <machine/bus.h>
   41 
   42 #include <dev/uart/uart.h>
   43 #include <dev/uart/uart_bus.h>
   44 #include <dev/uart/uart_cpu.h>
   45 
   46 #include <arm/at91/at91rm92reg.h>
   47 #include <arm/at91/at91var.h>
   48 
   49 bus_space_tag_t uart_bus_space_io;
   50 bus_space_tag_t uart_bus_space_mem;
   51 
   52 extern struct uart_class at91_usart_class;
   53 extern struct bus_space at91_bs_tag;
   54 
   55 int
   56 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   57 {
   58         return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
   59 }
   60 
   61 int
   62 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
   63 {
   64         struct uart_class *class;
   65 
   66         class = &at91_usart_class;
   67         if (class->uc_rclk == 0)
   68                 class->uc_rclk = at91_master_clock;
   69         di->ops = uart_getops(class);
   70         di->bas.chan = 0;
   71         di->bas.bst = &at91_bs_tag;
   72         /* 
   73          * XXX: Not pretty, but will work because we map the needed addresses
   74          * early.
   75          */
   76 #ifdef SKYEYE_WORKAROUNDS
   77         di->bas.bsh = AT91RM92_BASE + AT91RM92_USART0_BASE;
   78         di->baudrate = 38400;
   79 #else
   80         di->bas.bsh = AT91RM92_BASE + AT91RM92_SYS_BASE + DBGU;
   81         di->baudrate = 115200;
   82 #endif
   83         di->bas.regshft = 0;
   84         di->bas.rclk = 0;
   85         di->databits = 8;
   86         di->stopbits = 1;
   87         di->parity = UART_PARITY_NONE;
   88         uart_bus_space_io = &at91_bs_tag;
   89         uart_bus_space_mem = NULL;
   90         /* Check the environment for overrides */
   91         uart_getenv(devtype, di, class);
   92         return (0);
   93 }

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