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/mips/nlm/uart_cpu_xlp.c

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    1 /*-
    2  * Copyright 2003-2011 Netlogic Microsystems (Netlogic). All rights
    3  * reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions are
    7  * 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
   13  *    the documentation and/or other materials provided with the
   14  *    distribution.
   15  * 
   16  * THIS SOFTWARE IS PROVIDED BY Netlogic Microsystems ``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
   19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE 
   20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   26  * THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * NETLOGIC_BSD */
   29 
   30 /*
   31  * Skeleton of this file was based on respective code for ARM
   32  * code written by Olivier Houchard.
   33  */
   34 /*
   35  * XLRMIPS: This file is hacked from arm/...
   36  */
   37 #include "opt_uart.h"
   38 
   39 #include <sys/cdefs.h>
   40 __FBSDID("$FreeBSD: stable/9/sys/mips/nlm/uart_cpu_xlp.c 225394 2011-09-05 10:45:29Z jchandra $");
   41 
   42 #include <sys/param.h>
   43 #include <sys/systm.h>
   44 #include <sys/bus.h>
   45 #include <sys/cons.h>
   46 #include <sys/kdb.h>
   47 #include <sys/kernel.h>
   48 #include <sys/lock.h>
   49 #include <sys/mutex.h>
   50 
   51 #include <machine/bus.h>
   52 
   53 #include <dev/uart/uart.h>
   54 #include <dev/uart/uart_cpu.h>
   55 
   56 #include <mips/nlm/hal/haldefs.h>
   57 #include <mips/nlm/hal/iomap.h>
   58 #include <mips/nlm/hal/uart.h>
   59 
   60 bus_space_tag_t uart_bus_space_io;
   61 bus_space_tag_t uart_bus_space_mem;
   62 
   63 /*
   64  * need a special bus space for this, because the Netlogic SoC
   65  * UART allows only 32 bit access to its registers
   66  */
   67 static struct bus_space nlm_uart_bussp;
   68 
   69 static u_int8_t
   70 nlm_uart_bussp_read_1(void *tag, bus_space_handle_t handle,
   71     bus_size_t offset)
   72 {
   73         return (u_int8_t)(*(volatile u_int32_t *)(handle + offset));
   74 }
   75 
   76 static void
   77 nlm_uart_bussp_write_1(void *tag, bus_space_handle_t handle,
   78     bus_size_t offset, u_int8_t value)
   79 {
   80         *(volatile u_int32_t *)(handle + offset) =  value;
   81 }
   82 
   83 int
   84 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   85 {
   86         return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
   87 }
   88 
   89 int
   90 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
   91 {
   92         /* Create custom bus space */
   93         memcpy(&nlm_uart_bussp, rmi_bus_space, sizeof(nlm_uart_bussp));
   94         nlm_uart_bussp.bs_r_1 = nlm_uart_bussp_read_1;
   95         nlm_uart_bussp.bs_w_1 = nlm_uart_bussp_write_1;
   96 
   97         di->ops = uart_getops(&uart_ns8250_class);
   98         di->bas.chan = 0;
   99         di->bas.bst = &nlm_uart_bussp;
  100         di->bas.bsh = nlm_get_uart_regbase(0, 0);
  101         
  102         di->bas.regshft = 2;
  103         /* divisor = rclk / (baudrate * 16); */
  104         di->bas.rclk = 133000000;
  105         di->baudrate = 115200;
  106         di->databits = 8;
  107         di->stopbits = 1;
  108         di->parity = UART_PARITY_NONE;
  109 
  110         uart_bus_space_io = NULL;
  111         uart_bus_space_mem = &nlm_uart_bussp;
  112         return (0);
  113 }

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