uart_cpu_chipc.c

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    1 /*-
    2  * Copyright (c) 2016 Michael Zhilin <mizhka@gmail.com>
    3  *
    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  * 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 AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD$");
   30 
   31 #include "opt_uart.h"
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h>
   35 #include <sys/bus.h>
   36 #include <sys/cons.h>
   37 #include <sys/lock.h>
   38 #include <sys/mutex.h>
   39 
   40 #include <machine/bus.h>
   41 
   42 #include <dev/bhnd/cores/chipc/chipcreg.h>
   43 
   44 #include <dev/uart/uart.h>
   45 #include <dev/uart/uart_bus.h>
   46 #include <dev/uart/uart_cpu.h>
   47 
   48 #include "bcm_socinfo.h"
   49 
   50 bus_space_tag_t uart_bus_space_io;
   51 bus_space_tag_t uart_bus_space_mem;
   52 
   53 static struct uart_class *chipc_uart_class = &uart_ns8250_class;
   54 
   55 #define CHIPC_UART_BAUDRATE     115200
   56 
   57 int
   58 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   59 {
   60         return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
   61 }
   62 
   63 static int
   64 uart_cpu_init(struct uart_devinfo *di, int uart, int baudrate)
   65 {
   66         struct bcm_socinfo      *socinfo;
   67 
   68         if (uart >= CHIPC_UART_MAX)
   69                 return (EINVAL);
   70 
   71         socinfo = bcm_get_socinfo();
   72         di->ops = uart_getops(chipc_uart_class);
   73         di->bas.chan = 0;
   74         di->bas.bst = uart_bus_space_mem;
   75         di->bas.bsh = (bus_space_handle_t) BCM_SOCREG(CHIPC_UART(uart));
   76         di->bas.regshft = 0;
   77         di->bas.rclk = socinfo->uartrate;  /* in Hz */
   78         di->baudrate = baudrate;
   79         di->databits = 8;
   80         di->stopbits = 1;
   81         di->parity = UART_PARITY_NONE;
   82 
   83         return (0);
   84 }
   85 
   86 int
   87 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
   88 {
   89         int                      ivar;
   90 
   91         uart_bus_space_io = NULL;
   92         uart_bus_space_mem = mips_bus_space_generic;
   93 
   94         /* Check the environment. */
   95         if (uart_getenv(devtype, di, chipc_uart_class) == 0)
   96                 return (0);
   97 
   98         /* Scan the device hints for the first matching device */
   99         for (int i = 0; i < CHIPC_UART_MAX; i++) {
  100                 if (resource_int_value("uart", i, "flags", &ivar))
  101                         continue;
  102 
  103                 /* Check usability */
  104                 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
  105                         continue;
  106 
  107                 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
  108                         continue;
  109 
  110                 if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
  111                     ivar == 0)
  112                         continue;
  113 
  114                 /* Found */
  115                 if (resource_int_value("uart", i, "baud", &ivar) != 0)
  116                         ivar = CHIPC_UART_BAUDRATE;
  117                 
  118                 return (uart_cpu_init(di, i, ivar));
  119         }
  120 
  121         /* Default to uart0/115200 */
  122         return (uart_cpu_init(di, 0, CHIPC_UART_BAUDRATE));
  123 }

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FreeBSD/Linux Kernel Cross Reference sys/mips/broadcom/uart_cpu_chipc.c

FreeBSD/Linux Kernel Cross Reference
sys/mips/broadcom/uart_cpu_chipc.c