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/mediatek/mtk_sysctl.c

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    1 /*-
    2  * Copyright (c) 2016 Stanislav Galabov.
    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  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: stable/12/sys/mips/mediatek/mtk_sysctl.c 297666 2016-04-07 11:02:49Z sgalabov $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/interrupt.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 #include <sys/rman.h>
   39 #include <sys/malloc.h>
   40 
   41 #include <machine/fdt.h>
   42 
   43 #include <dev/ofw/openfirm.h>
   44 #include <dev/ofw/ofw_bus.h>
   45 #include <dev/ofw/ofw_bus_subr.h>
   46 
   47 #include <mips/mediatek/mtk_sysctl.h>
   48 
   49 #include <dev/fdt/fdt_common.h>
   50 
   51 struct mtk_sysctl_softc {
   52         device_t        dev;
   53         struct resource *mem_res;
   54         int             mem_rid;
   55         struct mtx      mtx;
   56 };
   57 
   58 static struct mtk_sysctl_softc *mtk_sysctl_sc = NULL;
   59 
   60 static struct ofw_compat_data compat_data[] = {
   61         { "ralink,rt2880-sysc",         1 },
   62         { "ralink,rt3050-sysc",         1 },
   63         { "ralink,rt3352-sysc",         1 },
   64         { "ralink,rt3883-sysc",         1 },
   65         { "ralink,rt5350-sysc",         1 },
   66         { "ralink,mt7620a-sysc",        1 },
   67         { "mtk,mt7621-sysc",            1 },
   68 
   69         /* Sentinel */
   70         { NULL,                         0 }
   71 };
   72 
   73 #define MTK_SYSCTL_LOCK(sc)             mtx_lock_spin(&(sc)->mtx)
   74 #define MTK_SYSCTL_UNLOCK(sc)           mtx_unlock_spin(&(sc)->mtx)
   75 #define MTK_SYSCTL_LOCK_INIT(sc)                \
   76     mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev),        \
   77     "mtk_sysctl", MTX_SPIN)
   78 #define MTK_SYSCTL_LOCK_DESTROY(sc)     mtx_destroy(&(sc)->mtx)
   79 
   80 static int
   81 mtk_sysctl_probe(device_t dev)
   82 {
   83 
   84         if (!ofw_bus_status_okay(dev))
   85                 return (ENXIO);
   86 
   87         if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
   88                 return (ENXIO);
   89 
   90         device_set_desc(dev, "MTK System Controller");
   91 
   92         return (BUS_PROBE_DEFAULT);
   93 }
   94 
   95 static int mtk_sysctl_detach(device_t);
   96 
   97 static int
   98 mtk_sysctl_attach(device_t dev)
   99 {
  100         struct mtk_sysctl_softc *sc = device_get_softc(dev);
  101 
  102         if (device_get_unit(dev) != 0 || mtk_sysctl_sc != NULL) {
  103                 device_printf(dev, "Only one sysctl module supported\n");
  104                 return (ENXIO);
  105         }
  106 
  107         mtk_sysctl_sc = sc;
  108 
  109         /* Map control/status registers. */
  110         sc->mem_rid = 0;
  111         sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
  112             &sc->mem_rid, RF_ACTIVE);
  113 
  114         if (sc->mem_res == NULL) {
  115                 device_printf(dev, "couldn't map memory\n");
  116                 mtk_sysctl_detach(dev);
  117                 return (ENXIO);
  118         }
  119 
  120         sc->dev = dev;
  121 
  122         MTK_SYSCTL_LOCK_INIT(sc);
  123 
  124         return (0);
  125 }
  126 
  127 static int
  128 mtk_sysctl_detach(device_t dev)
  129 {
  130         struct mtk_sysctl_softc *sc = device_get_softc(dev);
  131 
  132         if (sc->mem_res)
  133                 bus_release_resource(dev, SYS_RES_MEMORY, sc->mem_rid,
  134                     sc->mem_res);
  135 
  136         MTK_SYSCTL_LOCK_DESTROY(sc);
  137 
  138         return(0);
  139 }
  140 
  141 uint32_t
  142 mtk_sysctl_get(uint32_t reg)
  143 {
  144         uint32_t val;
  145 
  146         MTK_SYSCTL_LOCK(mtk_sysctl_sc);
  147         val = bus_read_4(mtk_sysctl_sc->mem_res, reg);
  148         MTK_SYSCTL_UNLOCK(mtk_sysctl_sc);
  149 
  150         return (val);
  151 }
  152 
  153 void
  154 mtk_sysctl_set(uint32_t reg, uint32_t val)
  155 {
  156 
  157         MTK_SYSCTL_LOCK(mtk_sysctl_sc);
  158         bus_write_4(mtk_sysctl_sc->mem_res, reg, val);
  159         MTK_SYSCTL_UNLOCK(mtk_sysctl_sc);
  160 }
  161 
  162 void
  163 mtk_sysctl_clr_set(uint32_t reg, uint32_t clr, uint32_t set)
  164 {
  165         uint32_t val;
  166 
  167         MTK_SYSCTL_LOCK(mtk_sysctl_sc);
  168         val = bus_read_4(mtk_sysctl_sc->mem_res, reg);
  169         val &= ~(clr);
  170         val |= set;
  171         bus_write_4(mtk_sysctl_sc->mem_res, reg, val);
  172         MTK_SYSCTL_UNLOCK(mtk_sysctl_sc);
  173 }
  174 
  175 static device_method_t mtk_sysctl_methods[] = {
  176         DEVMETHOD(device_probe,         mtk_sysctl_probe),
  177         DEVMETHOD(device_attach,        mtk_sysctl_attach),
  178         DEVMETHOD(device_detach,        mtk_sysctl_detach),
  179 
  180         DEVMETHOD_END
  181 };
  182 
  183 static driver_t mtk_sysctl_driver = {
  184         "sysc",
  185         mtk_sysctl_methods,
  186         sizeof(struct mtk_sysctl_softc),
  187 };
  188 static devclass_t mtk_sysctl_devclass;
  189 
  190 EARLY_DRIVER_MODULE(mtk_sysctl, simplebus, mtk_sysctl_driver,
  191     mtk_sysctl_devclass, 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_EARLY);

Cache object: 4f6c3467fa1abedc509d4d681a78b8bc


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