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/broadcom/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: stable/12/sys/mips/broadcom/uart_cpu_chipc.c 304871 2016-08-27 00:06:20Z landonf $");
   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 #ifdef CFE
   49 #include <dev/cfe/cfe_api.h>
   50 #include <dev/cfe/cfe_ioctl.h>
   51 #include <dev/cfe/cfe_error.h>
   52 #endif
   53 
   54 #include "bcm_machdep.h"
   55 
   56 bus_space_tag_t uart_bus_space_io;
   57 bus_space_tag_t uart_bus_space_mem;
   58 
   59 static struct uart_class *chipc_uart_class = &uart_ns8250_class;
   60 
   61 #define CHIPC_UART_BAUDRATE     115200
   62 
   63 int
   64 uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
   65 {
   66         return ((b1->bsh == b2->bsh && b1->bst == b2->bst) ? 1 : 0);
   67 }
   68 
   69 static int
   70 uart_cpu_init(struct uart_devinfo *di, u_int uart, int baudrate)
   71 {
   72         if (uart >= CHIPC_UART_MAX)
   73                 return (EINVAL);
   74 
   75         di->ops = uart_getops(chipc_uart_class);
   76         di->bas.chan = 0;
   77         di->bas.bst = uart_bus_space_mem;
   78         di->bas.bsh = (bus_space_handle_t) BCM_CORE_ADDR(bcm_get_platform(),
   79             cc_addr, CHIPC_UART(uart));
   80         di->bas.regshft = 0;
   81         di->bas.rclk = bcm_get_uart_rclk(bcm_get_platform());
   82         di->baudrate = baudrate;
   83         di->databits = 8;
   84         di->stopbits = 1;
   85         di->parity = UART_PARITY_NONE;
   86 
   87         return (0);
   88 }
   89 
   90 #ifdef CFE
   91 static int
   92 uart_getenv_cfe(int devtype, struct uart_devinfo *di)
   93 {
   94         char    device[sizeof("uartXX")];
   95         int     baud, fd, len;
   96         int     ret;
   97         u_int   uart;
   98 
   99         /* CFE only vends console configuration */
  100         if (devtype != UART_DEV_CONSOLE)
  101                 return (ENODEV);
  102 
  103         /* Fetch console device */
  104         ret = cfe_getenv("BOOT_CONSOLE", device, sizeof(device));
  105         if (ret != CFE_OK)
  106                 return (ENXIO);
  107 
  108         /* Parse serial console unit. Fails on non-uart devices.  */
  109         if (sscanf(device, "uart%u", &uart) != 1)
  110                 return (ENXIO);
  111 
  112         /* Fetch device handle */
  113         fd = bcm_get_platform()->cfe_console;
  114         if (fd < 0)
  115                 return (ENXIO);
  116 
  117         /* Fetch serial configuration */
  118         ret = cfe_ioctl(fd, IOCTL_SERIAL_GETSPEED, (unsigned char *)&baud,
  119             sizeof(baud), &len, 0);     
  120         if (ret != CFE_OK)
  121                 baud = CHIPC_UART_BAUDRATE;
  122 
  123         /* Initialize device info */
  124         return (uart_cpu_init(di, uart, baud));
  125 }
  126 #endif /* CFE */
  127 
  128 int
  129 uart_cpu_getdev(int devtype, struct uart_devinfo *di)
  130 {
  131         int                      ivar;
  132 
  133         uart_bus_space_io = NULL;
  134         uart_bus_space_mem = mips_bus_space_generic;
  135 
  136 #ifdef CFE
  137         /* Check the CFE environment */
  138         if (uart_getenv_cfe(devtype, di) == 0)
  139                 return (0);
  140 #endif /* CFE */
  141 
  142         /* Check the kernel environment. */
  143         if (uart_getenv(devtype, di, chipc_uart_class) == 0)
  144                 return (0);
  145 
  146         /* Scan the device hints for the first matching device */
  147         for (u_int i = 0; i < CHIPC_UART_MAX; i++) {
  148                 if (resource_int_value("uart", i, "flags", &ivar))
  149                         continue;
  150 
  151                 /* Check usability */
  152                 if (devtype == UART_DEV_CONSOLE && !UART_FLAGS_CONSOLE(ivar))
  153                         continue;
  154 
  155                 if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
  156                         continue;
  157 
  158                 if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
  159                     ivar == 0)
  160                         continue;
  161 
  162                 /* Found */
  163                 if (resource_int_value("uart", i, "baud", &ivar) != 0)
  164                         ivar = CHIPC_UART_BAUDRATE;
  165                 
  166                 return (uart_cpu_init(di, i, ivar));
  167         }
  168 
  169         /* Default to uart0/115200 */
  170         return (uart_cpu_init(di, 0, CHIPC_UART_BAUDRATE));
  171 }

Cache object: 9d89730bfa144b86891876c1299b5309


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