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/ingenic/jz4780_uart.c

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    1 /*-
    2  * Copyright (c) 2013 Ian Lepore
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are 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 the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include "opt_platform.h"
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: stable/12/sys/mips/ingenic/jz4780_uart.c 338074 2018-08-19 21:10:21Z mmacy $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/bus.h>
   35 #include <sys/conf.h>
   36 #include <sys/kernel.h>
   37 #include <sys/module.h>
   38 #include <sys/sysctl.h>
   39 #include <machine/bus.h>
   40 
   41 #include <dev/extres/clk/clk.h>
   42 #include <dev/fdt/fdt_common.h>
   43 #include <dev/ofw/ofw_bus.h>
   44 #include <dev/ofw/ofw_bus_subr.h>
   45 #include <dev/uart/uart.h>
   46 #include <dev/uart/uart_cpu.h>
   47 #include <dev/uart/uart_cpu_fdt.h>
   48 #include <dev/uart/uart_bus.h>
   49 #include <dev/uart/uart_dev_ns8250.h>
   50 #include <dev/ic/ns16550.h>
   51 #include "uart_if.h"
   52 
   53 /*
   54  * High-level UART interface.
   55  */
   56 struct jz4780_uart_softc {
   57         struct ns8250_softc ns8250_base;
   58         clk_t           clk_mod;
   59         clk_t           clk_baud;
   60 };
   61 
   62 static int
   63 jz4780_bus_attach(struct uart_softc *sc)
   64 {
   65         struct ns8250_softc *ns8250;
   66         struct uart_bas *bas;
   67         int rv;
   68 
   69         ns8250 = (struct ns8250_softc *)sc;
   70         bas = &sc->sc_bas;
   71 
   72         rv = ns8250_bus_attach(sc);
   73         if (rv != 0)
   74                 return (0);
   75 
   76         /* Configure uart to use extra IER_RXTMOUT bit */
   77         ns8250->ier_rxbits = IER_RXTMOUT | IER_EMSC | IER_ERLS | IER_ERXRDY;
   78         ns8250->ier_mask = ~(ns8250->ier_rxbits);
   79         ns8250->ier = uart_getreg(bas, REG_IER) & ns8250->ier_mask;
   80         ns8250->ier |= ns8250->ier_rxbits;
   81         uart_setreg(bas, REG_IER, ns8250->ier);
   82         uart_barrier(bas);
   83         return (0);
   84 }
   85 
   86 static kobj_method_t jz4780_uart_methods[] = {
   87         KOBJMETHOD(uart_probe,          ns8250_bus_probe),
   88         KOBJMETHOD(uart_attach,         jz4780_bus_attach),
   89         KOBJMETHOD(uart_detach,         ns8250_bus_detach),
   90         KOBJMETHOD(uart_flush,          ns8250_bus_flush),
   91         KOBJMETHOD(uart_getsig,         ns8250_bus_getsig),
   92         KOBJMETHOD(uart_ioctl,          ns8250_bus_ioctl),
   93         KOBJMETHOD(uart_ipend,          ns8250_bus_ipend),
   94         KOBJMETHOD(uart_param,          ns8250_bus_param),
   95         KOBJMETHOD(uart_receive,        ns8250_bus_receive),
   96         KOBJMETHOD(uart_setsig,         ns8250_bus_setsig),
   97         KOBJMETHOD(uart_transmit,       ns8250_bus_transmit),
   98         KOBJMETHOD(uart_grab,           ns8250_bus_grab),
   99         KOBJMETHOD(uart_ungrab,         ns8250_bus_ungrab),
  100         KOBJMETHOD_END
  101 };
  102 
  103 static struct uart_class jz4780_uart_class = {
  104         "jz4780_uart_class",
  105         jz4780_uart_methods,
  106         sizeof(struct jz4780_uart_softc),
  107         .uc_ops = &uart_ns8250_ops,
  108         .uc_range = 8,
  109         .uc_rclk = 0,
  110 };
  111 
  112 /* Compatible devices. */
  113 static struct ofw_compat_data compat_data[] = {
  114         {"ingenic,jz4780-uart", (uintptr_t)&jz4780_uart_class},
  115         {NULL,                  (uintptr_t)NULL},
  116 };
  117 
  118 UART_FDT_CLASS(compat_data);
  119 
  120 /*
  121  * UART Driver interface.
  122  */
  123 static int
  124 jz4780_uart_get_shift(device_t dev)
  125 {
  126         phandle_t node;
  127         pcell_t shift;
  128 
  129         node = ofw_bus_get_node(dev);
  130         if ((OF_getencprop(node, "reg-shift", &shift, sizeof(shift))) <= 0)
  131                 shift = 2;
  132         return ((int)shift);
  133 }
  134 
  135 static int
  136 jz4780_uart_probe(device_t dev)
  137 {
  138         struct jz4780_uart_softc *sc;
  139         uint64_t freq;
  140         int shift;
  141         int rv;
  142         const struct ofw_compat_data *cd;
  143 
  144         sc = device_get_softc(dev);
  145         if (!ofw_bus_status_okay(dev))
  146                 return (ENXIO);
  147         cd = ofw_bus_search_compatible(dev, compat_data);
  148         if (cd->ocd_data == 0)
  149                 return (ENXIO);
  150 
  151         /* Figure out clock setup */
  152         rv = clk_get_by_ofw_name(dev, 0, "module", &sc->clk_mod);
  153         if (rv != 0) {
  154                 device_printf(dev, "Cannot get UART clock: %d\n", rv);
  155                 return (ENXIO);
  156         }
  157         rv = clk_enable(sc->clk_mod);
  158         if (rv != 0) {
  159                 device_printf(dev, "Cannot enable UART clock: %d\n", rv);
  160                 return (ENXIO);
  161         }
  162         rv = clk_get_by_ofw_name(dev, 0, "baud", &sc->clk_baud);
  163         if (rv != 0) {
  164                 device_printf(dev, "Cannot get UART clock: %d\n", rv);
  165                 return (ENXIO);
  166         }
  167         rv = clk_enable(sc->clk_baud);
  168         if (rv != 0) {
  169                 device_printf(dev, "Cannot enable UART clock: %d\n", rv);
  170                 return (ENXIO);
  171         }
  172         rv = clk_get_freq(sc->clk_baud, &freq);
  173         if (rv != 0) {
  174                 device_printf(dev, "Cannot determine UART clock frequency: %d\n", rv);
  175                 return (ENXIO);
  176         }
  177 
  178         if (bootverbose)
  179                 device_printf(dev, "got UART clock: %lld\n", freq);
  180         sc->ns8250_base.base.sc_class = (struct uart_class *)cd->ocd_data;
  181         shift = jz4780_uart_get_shift(dev);
  182         return (uart_bus_probe(dev, shift, 0, (int)freq, 0, 0, 0));
  183 }
  184 
  185 static int
  186 jz4780_uart_detach(device_t dev)
  187 {
  188         struct jz4780_uart_softc *sc;
  189         int rv;
  190 
  191         rv = uart_bus_detach(dev);
  192         if (rv != 0)
  193                 return (rv);
  194 
  195         sc = device_get_softc(dev);
  196         if (sc->clk_mod != NULL) {
  197                 clk_release(sc->clk_mod);
  198         }
  199         if (sc->clk_baud != NULL) {
  200                 clk_release(sc->clk_baud);
  201         }
  202         return (0);
  203 }
  204 
  205 static device_method_t jz4780_uart_bus_methods[] = {
  206         /* Device interface */
  207         DEVMETHOD(device_probe,         jz4780_uart_probe),
  208         DEVMETHOD(device_attach,        uart_bus_attach),
  209         DEVMETHOD(device_detach,        jz4780_uart_detach),
  210         { 0, 0 }
  211 };
  212 
  213 static driver_t jz4780_uart_driver = {
  214         uart_driver_name,
  215         jz4780_uart_bus_methods,
  216         sizeof(struct jz4780_uart_softc),
  217 };
  218 
  219 DRIVER_MODULE(jz4780_uart, simplebus,  jz4780_uart_driver, uart_devclass,
  220     0, 0);

Cache object: 918678274f577b6d1cb33f703f97cb22


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