uart_dev_ti8250.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10

    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2013 Ian Lepore
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  *
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #include "opt_platform.h"
   30 
   31 #include <sys/cdefs.h>
   32 __FBSDID("$FreeBSD$");
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/bus.h>
   37 #include <sys/conf.h>
   38 #include <sys/kernel.h>
   39 #include <sys/sysctl.h>
   40 #include <machine/bus.h>
   41 
   42 #include <dev/fdt/fdt_common.h>
   43 #include <dev/ofw/ofw_bus.h>
   44 #include <dev/ofw/ofw_bus_subr.h>
   45 
   46 #include <dev/uart/uart.h>
   47 #include <dev/uart/uart_cpu.h>
   48 #include <dev/uart/uart_cpu_fdt.h>
   49 #include <dev/uart/uart_bus.h>
   50 #include <dev/uart/uart_dev_ns8250.h>
   51 
   52 #include <arm/ti/ti_sysc.h>
   53 
   54 #include "uart_if.h"
   55 
   56 /*
   57  * High-level UART interface.
   58  */
   59 struct ti8250_softc {
   60         struct ns8250_softc ns8250_base;
   61         /*uint32_t      mystuff;*/
   62 };
   63 
   64 #define MDR1_REG                8
   65 #define   MDR1_MODE_UART        0
   66 #define   MDR1_MODE_DISABLE     7
   67 #define SYSCC_REG               15
   68 #define   SYSCC_SOFTRESET       (1 << 1)
   69 #define SYSS_REG                16
   70 #define   SYSS_STATUS_RESETDONE (1 << 0)
   71 
   72 static int
   73 ti8250_bus_probe(struct uart_softc *sc)
   74 {
   75         int status;
   76 
   77         if ((status = ti_sysc_clock_enable(device_get_parent(sc->sc_dev))) != 0)
   78                 return (status);
   79 
   80         /*
   81          * Set the hardware to disabled mode, do a full device reset, then set
   82          * it to uart mode.  Most devices will be reset-and-disabled already,
   83          * but you never know what a bootloader might have done.
   84          */
   85         uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_DISABLE);
   86         uart_setreg(&sc->sc_bas, SYSCC_REG, SYSCC_SOFTRESET);
   87         while (uart_getreg(&sc->sc_bas, SYSS_REG) & SYSS_STATUS_RESETDONE)
   88                 continue;
   89         uart_setreg(&sc->sc_bas, MDR1_REG, MDR1_MODE_UART);
   90 
   91         status = ns8250_bus_probe(sc); 
   92         if (status == 0)
   93                 device_set_desc(sc->sc_dev, "TI UART (16550 compatible)");
   94 
   95         return (status);
   96 }
   97 
   98 static kobj_method_t ti8250_methods[] = {
   99         KOBJMETHOD(uart_probe,          ti8250_bus_probe),
  100 
  101         KOBJMETHOD(uart_attach,         ns8250_bus_attach),
  102         KOBJMETHOD(uart_detach,         ns8250_bus_detach),
  103         KOBJMETHOD(uart_flush,          ns8250_bus_flush),
  104         KOBJMETHOD(uart_getsig,         ns8250_bus_getsig),
  105         KOBJMETHOD(uart_ioctl,          ns8250_bus_ioctl),
  106         KOBJMETHOD(uart_ipend,          ns8250_bus_ipend),
  107         KOBJMETHOD(uart_param,          ns8250_bus_param),
  108         KOBJMETHOD(uart_receive,        ns8250_bus_receive),
  109         KOBJMETHOD(uart_setsig,         ns8250_bus_setsig),
  110         KOBJMETHOD(uart_transmit,       ns8250_bus_transmit),
  111         KOBJMETHOD_END
  112 };
  113 
  114 static struct uart_class uart_ti8250_class = {
  115         "ti8250",
  116         ti8250_methods,
  117         sizeof(struct ti8250_softc),
  118         .uc_ops = &uart_ns8250_ops,
  119         .uc_range = 0x88,
  120         .uc_rclk = 48000000,
  121         .uc_rshift = 2
  122 };
  123 static struct ofw_compat_data compat_data[] = {
  124         {"ti,ns16550",          (uintptr_t)&uart_ti8250_class},
  125         {"ti,omap3-uart",       (uintptr_t)&uart_ti8250_class},
  126         {"ti,omap4-uart",       (uintptr_t)&uart_ti8250_class},
  127         {NULL,                  (uintptr_t)NULL},
  128 };
  129 UART_FDT_CLASS_AND_DEVICE(compat_data);

Cache object: 05878a041de4e37621dd7ff8b4b2d101

[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.

FreeBSD/Linux Kernel Cross Reference sys/dev/uart/uart_dev_ti8250.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart_dev_ti8250.c