sys/sparc64/sparc64/schppm.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2008 Marius Strobl <marius@FreeBSD.org>
   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  * 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/bus.h>
  35 #include <sys/kernel.h>
  36 #include <sys/module.h>
  37 #include <sys/resource.h>
  38 #include <sys/rman.h>
  39
  40 #include <dev/ofw/ofw_bus.h>
  41
  42 #include <machine/bus.h>
  43 #include <machine/resource.h>
  44
  45 #define SCHPPM_NREG     1
  46
  47 #define SCHPPM_ESTAR    0
  48
  49 #define SCHPPM_ESTAR_CTRL               0x00
  50 #define SCHPPM_ESTAR_CTRL_1             0x00000001
  51 #define SCHPPM_ESTAR_CTRL_2             0x00000002
  52 #define SCHPPM_ESTAR_CTRL_32            0x00000020
  53 #define SCHPPM_ESTAR_CTRL_MASK                                          \
  54         (SCHPPM_ESTAR_CTRL_1 | SCHPPM_ESTAR_CTRL_2 | SCHPPM_ESTAR_CTRL_32)
  55
  56 static struct resource_spec schppm_res_spec[] = {
  57         { SYS_RES_MEMORY, SCHPPM_ESTAR, RF_ACTIVE },
  58         { -1, 0 }
  59 };
  60
  61 struct schppm_softc {
  62         struct resource         *sc_res[SCHPPM_NREG];
  63 };
  64
  65 #define SCHPPM_READ(sc, reg, off)                                       \
  66         bus_read_8((sc)->sc_res[(reg)], (off))
  67 #define SCHPPM_WRITE(sc, reg, off, val)                                 \
  68         bus_write_8((sc)->sc_res[(reg)], (off), (val))
  69
  70 static device_probe_t schppm_probe;
  71 static device_attach_t schppm_attach;
  72
  73 static device_method_t schppm_methods[] = {
  74         /* Device interface */
  75         DEVMETHOD(device_probe,         schppm_probe),
  76         DEVMETHOD(device_attach,        schppm_attach),
  77
  78         DEVMETHOD_END
  79 };
  80
  81 static devclass_t schppm_devclass;
  82
  83 DEFINE_CLASS_0(schppm, schppm_driver, schppm_methods,
  84     sizeof(struct schppm_softc));
  85 DRIVER_MODULE(schppm, nexus, schppm_driver, schppm_devclass, 0, 0);
  86
  87 static int
  88 schppm_probe(device_t dev)
  89 {
  90         const char* compat;
  91
  92         compat = ofw_bus_get_compat(dev);
  93         if (compat != NULL && strcmp(ofw_bus_get_name(dev), "ppm") == 0 &&
  94             strcmp(compat, "gp2-ppm") == 0) {
  95                 device_set_desc(dev, "Schizo power management");
  96                 return (BUS_PROBE_DEFAULT);
  97         }
  98         return (ENXIO);
  99 }
 100
 101 static int
 102 schppm_attach(device_t dev)
 103 {
 104         struct schppm_softc *sc;
 105
 106         sc = device_get_softc(dev);
 107         if (bus_alloc_resources(dev, schppm_res_spec, sc->sc_res)) {
 108                 device_printf(dev, "failed to allocate resources\n");
 109                 bus_release_resources(dev, schppm_res_spec, sc->sc_res);
 110                 return (ENXIO);
 111         }
 112
 113         if (bootverbose) {
 114                 device_printf(dev, "running at ");
 115                 switch (SCHPPM_READ(sc, SCHPPM_ESTAR, SCHPPM_ESTAR_CTRL) &
 116                     SCHPPM_ESTAR_CTRL_MASK) {
 117                 case SCHPPM_ESTAR_CTRL_1:
 118                         printf("full");
 119                         break;
 120                 case SCHPPM_ESTAR_CTRL_2:
 121                         printf("half");
 122                         break;
 123                 case SCHPPM_ESTAR_CTRL_32:
 124                         printf("1/32");
 125                         break;
 126                 default:
 127                         printf("unknown");
 128                         break;
 129                 }
 130                 printf(" speed\n");
 131         }
 132
 133         return (0);
 134 }