alpine_serdes.c

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    1 /*-
    2  * Copyright (c) 2015,2016 Annapurna Labs Ltd. and affiliates
    3  * All rights reserved.
    4  *
    5  * Developed by Semihalf.
    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  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/module.h>
   36 #include <sys/bus.h>
   37 #include <sys/rman.h>
   38 #include <sys/conf.h>
   39 #include <sys/resource.h>
   40 
   41 #include <machine/bus.h>
   42 #include <dev/ofw/ofw_bus_subr.h>
   43 
   44 #include "al_serdes.h"
   45 #include "alpine_serdes.h"
   46 
   47 #define SERDES_NUM_GROUPS       5
   48 
   49 static void *serdes_base;
   50 static uint32_t serdes_grp_offset[] = {0, 0x400, 0x800, 0xc00, 0x2000};
   51 
   52 static struct alpine_serdes_eth_group_mode {
   53         struct mtx                      lock;
   54         enum alpine_serdes_eth_mode     mode;
   55         bool                            mode_set;
   56 } alpine_serdes_eth_group_mode[SERDES_NUM_GROUPS];
   57 
   58 static int al_serdes_probe(device_t dev);
   59 static int al_serdes_attach(device_t dev);
   60 static int al_serdes_detach(device_t dev);
   61 
   62 static struct resource_spec al_serdes_spec[] = {
   63         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
   64         { -1, 0 }
   65 };
   66 
   67 struct al_serdes_softc {
   68         struct resource *res;
   69 };
   70 
   71 static device_method_t al_serdes_methods[] = {
   72         DEVMETHOD(device_probe,         al_serdes_probe),
   73         DEVMETHOD(device_attach,        al_serdes_attach),
   74         DEVMETHOD(device_detach,        al_serdes_detach),
   75 
   76         DEVMETHOD_END
   77 };
   78 
   79 static driver_t al_serdes_driver = {
   80         "serdes",
   81         al_serdes_methods,
   82         sizeof(struct al_serdes_softc)
   83 };
   84 
   85 DRIVER_MODULE(al_serdes, simplebus, al_serdes_driver, 0, 0);
   86 DRIVER_MODULE(al_serdes, ofwbus, al_serdes_driver, 0, 0);
   87 
   88 static int
   89 al_serdes_probe(device_t dev)
   90 {
   91 
   92         if (!ofw_bus_status_okay(dev))
   93                 return (ENXIO);
   94 
   95         if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-serdes"))
   96                 return (ENXIO);
   97 
   98         device_set_desc(dev, "Alpine Serdes");
   99 
  100         return (BUS_PROBE_DEFAULT);
  101 }
  102 
  103 static int
  104 al_serdes_attach(device_t dev)
  105 {
  106         struct al_serdes_softc *sc;
  107         int err;
  108 
  109         sc = device_get_softc(dev);
  110 
  111         err = bus_alloc_resources(dev, al_serdes_spec, &sc->res);
  112         if (err != 0) {
  113                 device_printf(dev, "could not allocate resources\n");
  114                 return (err);
  115         }
  116 
  117         /* Initialize Serdes group locks and mode */
  118         for (int i = 0; i < nitems(alpine_serdes_eth_group_mode); i++) {
  119                 mtx_init(&alpine_serdes_eth_group_mode[i].lock, "AlSerdesMtx",
  120                     NULL, MTX_DEF);
  121                 alpine_serdes_eth_group_mode[i].mode_set = false;
  122         }
  123 
  124         serdes_base = (void *)rman_get_bushandle(sc->res);
  125 
  126         return (0);
  127 }
  128 
  129 static int
  130 al_serdes_detach(device_t dev)
  131 {
  132         struct al_serdes_softc *sc;
  133 
  134         sc = device_get_softc(dev);
  135 
  136         bus_release_resources(dev, al_serdes_spec, &sc->res);
  137 
  138         for (int i = 0; i < nitems(alpine_serdes_eth_group_mode); i++) {
  139                 mtx_destroy(&alpine_serdes_eth_group_mode[i].lock);
  140                 alpine_serdes_eth_group_mode[i].mode_set = false;
  141         }
  142 
  143         return (0);
  144 }
  145 
  146 void *
  147 alpine_serdes_resource_get(uint32_t group)
  148 {
  149         void *base;
  150 
  151         base = NULL;
  152         if (group >= SERDES_NUM_GROUPS)
  153                 return (NULL);
  154 
  155         if (serdes_base != NULL)
  156                 base = (void *)((uintptr_t)serdes_base +
  157                     serdes_grp_offset[group]);
  158 
  159         return (base);
  160 }
  161 
  162 int
  163 alpine_serdes_eth_mode_set(uint32_t group, enum alpine_serdes_eth_mode mode)
  164 {
  165         struct alpine_serdes_eth_group_mode *group_mode;
  166 
  167         group_mode = &alpine_serdes_eth_group_mode[group];
  168 
  169         if (serdes_base == NULL)
  170                 return (EINVAL);
  171 
  172         if (group >= SERDES_NUM_GROUPS)
  173                 return (EINVAL);
  174 
  175         mtx_lock(&group_mode->lock);
  176 
  177         if (!group_mode->mode_set || (group_mode->mode != mode)) {
  178                 struct al_serdes_grp_obj obj;
  179 
  180                 al_serdes_handle_grp_init(alpine_serdes_resource_get(group),
  181                     group, &obj);
  182 
  183                 if (mode == ALPINE_SERDES_ETH_MODE_SGMII)
  184                         obj.mode_set_sgmii(&obj);
  185                 else
  186                         obj.mode_set_kr(&obj);
  187 
  188                 group_mode->mode = mode;
  189                 group_mode->mode_set = true;
  190         }
  191 
  192         mtx_unlock(&group_mode->lock);
  193 
  194         return (0);
  195 }
  196 
  197 void
  198 alpine_serdes_eth_group_lock(uint32_t group)
  199 {
  200         struct alpine_serdes_eth_group_mode *group_mode;
  201 
  202         group_mode = &alpine_serdes_eth_group_mode[group];
  203 
  204         if (mtx_initialized(&group_mode->lock) == 0)
  205                 return;
  206 
  207         mtx_lock(&group_mode->lock);
  208 }
  209 
  210 void
  211 alpine_serdes_eth_group_unlock(uint32_t group)
  212 {
  213         struct alpine_serdes_eth_group_mode *group_mode;
  214 
  215         group_mode = &alpine_serdes_eth_group_mode[group];
  216 
  217         if (mtx_initialized(&group_mode->lock) == 0)
  218                 return;
  219 
  220         mtx_unlock(&group_mode->lock);
  221 }

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FreeBSD/Linux Kernel Cross Reference sys/arm/annapurna/alpine/alpine_serdes.c

FreeBSD/Linux Kernel Cross Reference
sys/arm/annapurna/alpine/alpine_serdes.c