sys/arm/annapurna/alpine/alpine_ccu.c

   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/bus.h>
  34 #include <sys/conf.h>
  35 #include <sys/rman.h>
  36 #include <sys/kernel.h>
  37 #include <sys/module.h>
  38 #include <sys/resource.h>
  39 #include <sys/systm.h>
  40
  41 #include <machine/bus.h>
  42 #include <dev/ofw/ofw_bus_subr.h>
  43
  44 #define AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET     0x4000
  45 #define AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET     0x5000
  46 #define AL_CCU_SPECULATION_CONTROL_OFFSET       0x4
  47
  48 static struct resource_spec al_ccu_spec[] = {
  49         { SYS_RES_MEMORY,       0,      RF_ACTIVE },
  50         { -1, 0 }
  51 };
  52
  53 struct al_ccu_softc {
  54         struct resource *res;
  55 };
  56
  57 static int al_ccu_probe(device_t dev);
  58 static int al_ccu_attach(device_t dev);
  59 static int al_ccu_detach(device_t dev);
  60
  61 static device_method_t al_ccu_methods[] = {
  62         DEVMETHOD(device_probe,         al_ccu_probe),
  63         DEVMETHOD(device_attach,        al_ccu_attach),
  64         DEVMETHOD(device_detach,        al_ccu_detach),
  65
  66         { 0, 0 }
  67 };
  68
  69 static driver_t al_ccu_driver = {
  70         "ccu",
  71         al_ccu_methods,
  72         sizeof(struct al_ccu_softc)
  73 };
  74
  75 static devclass_t al_ccu_devclass;
  76
  77 EARLY_DRIVER_MODULE(al_ccu, simplebus, al_ccu_driver,
  78     al_ccu_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
  79 EARLY_DRIVER_MODULE(al_ccu, ofwbus, al_ccu_driver,
  80     al_ccu_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
  81
  82 static int
  83 al_ccu_probe(device_t dev)
  84 {
  85
  86         if (!ofw_bus_status_okay(dev))
  87                 return (ENXIO);
  88
  89         if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-ccu"))
  90                 return (ENXIO);
  91
  92         device_set_desc(dev, "Alpine CCU");
  93
  94         return (BUS_PROBE_DEFAULT);
  95 }
  96
  97 static int
  98 al_ccu_attach(device_t dev)
  99 {
 100         struct al_ccu_softc *sc;
 101         int err;
 102
 103         sc = device_get_softc(dev);
 104
 105         err = bus_alloc_resources(dev, al_ccu_spec, &sc->res);
 106         if (err != 0) {
 107                 device_printf(dev, "could not allocate resources\n");
 108                 return (err);
 109         }
 110
 111         /* Enable cache snoop */
 112         bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET, 1);
 113         bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET, 1);
 114
 115         /* Disable speculative fetches from masters */
 116         bus_write_4(sc->res, AL_CCU_SPECULATION_CONTROL_OFFSET, 7);
 117
 118         return (0);
 119 }
 120
 121 static int
 122 al_ccu_detach(device_t dev)
 123 {
 124         struct al_ccu_softc *sc;
 125
 126         sc = device_get_softc(dev);
 127
 128         bus_release_resources(dev, al_ccu_spec, &sc->res);
 129
 130         return (0);
 131 }