schppm.c

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    1 /*-
    2  * Copyright (c) 2008 Marius Strobl <marius@FreeBSD.org>
    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("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/bus.h>
   33 #include <sys/kernel.h>
   34 #include <sys/module.h>
   35 #include <sys/resource.h>
   36 #include <sys/rman.h>
   37 
   38 #include <dev/ofw/ofw_bus.h>
   39 
   40 #include <machine/bus.h>
   41 #include <machine/resource.h>
   42 
   43 #define SCHPPM_NREG     1
   44 
   45 #define SCHPPM_ESTAR    0
   46 
   47 #define SCHPPM_ESTAR_CTRL               0x00
   48 #define SCHPPM_ESTAR_CTRL_1             0x00000001
   49 #define SCHPPM_ESTAR_CTRL_2             0x00000002
   50 #define SCHPPM_ESTAR_CTRL_32            0x00000020
   51 #define SCHPPM_ESTAR_CTRL_MASK                                          \
   52         (SCHPPM_ESTAR_CTRL_1 | SCHPPM_ESTAR_CTRL_2 | SCHPPM_ESTAR_CTRL_32)
   53 
   54 static struct resource_spec schppm_res_spec[] = {
   55         { SYS_RES_MEMORY, SCHPPM_ESTAR, RF_ACTIVE },
   56         { -1, 0 }
   57 };
   58 
   59 struct schppm_softc {
   60         struct resource         *sc_res[SCHPPM_NREG];
   61 };
   62 
   63 #define SCHPPM_READ(sc, reg, off)                                       \
   64         bus_read_8((sc)->sc_res[(reg)], (off))
   65 #define SCHPPM_WRITE(sc, reg, off, val)                                 \
   66         bus_write_8((sc)->sc_res[(reg)], (off), (val))
   67 
   68 static device_probe_t schppm_probe;
   69 static device_attach_t schppm_attach;
   70 
   71 static device_method_t schppm_methods[] = {
   72         /* Device interface */
   73         DEVMETHOD(device_probe,         schppm_probe),
   74         DEVMETHOD(device_attach,        schppm_attach),
   75 
   76         DEVMETHOD_END
   77 };
   78 
   79 static devclass_t schppm_devclass;
   80 
   81 DEFINE_CLASS_0(schppm, schppm_driver, schppm_methods,
   82     sizeof(struct schppm_softc));
   83 DRIVER_MODULE(schppm, nexus, schppm_driver, schppm_devclass, 0, 0);
   84 
   85 static int
   86 schppm_probe(device_t dev)
   87 {
   88         const char* compat;
   89 
   90         compat = ofw_bus_get_compat(dev);
   91         if (compat != NULL && strcmp(ofw_bus_get_name(dev), "ppm") == 0 &&
   92             strcmp(compat, "gp2-ppm") == 0) {
   93                 device_set_desc(dev, "Schizo power management");
   94                 return (BUS_PROBE_DEFAULT);
   95         }
   96         return (ENXIO);
   97 }
   98 
   99 static int
  100 schppm_attach(device_t dev)
  101 {
  102         struct schppm_softc *sc;
  103 
  104         sc = device_get_softc(dev);
  105         if (bus_alloc_resources(dev, schppm_res_spec, sc->sc_res)) {
  106                 device_printf(dev, "failed to allocate resources\n");
  107                 bus_release_resources(dev, schppm_res_spec, sc->sc_res);
  108                 return (ENXIO);
  109         }
  110 
  111         if (bootverbose) {
  112                 device_printf(dev, "running at ");
  113                 switch (SCHPPM_READ(sc, SCHPPM_ESTAR, SCHPPM_ESTAR_CTRL) &
  114                     SCHPPM_ESTAR_CTRL_MASK) {
  115                 case SCHPPM_ESTAR_CTRL_1:
  116                         printf("full");
  117                         break;
  118                 case SCHPPM_ESTAR_CTRL_2:
  119                         printf("half");
  120                         break;
  121                 case SCHPPM_ESTAR_CTRL_32:
  122                         printf("1/32");
  123                         break;
  124                 default:
  125                         printf("unknown");
  126                         break;
  127                 }
  128                 printf(" speed\n");
  129         }
  130 
  131         return (0);
  132 }

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FreeBSD/Linux Kernel Cross Reference sys/sparc64/sparc64/schppm.c

FreeBSD/Linux Kernel Cross Reference
sys/sparc64/sparc64/schppm.c