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/param.h> 30 #include <sys/bus.h> 31 #include <sys/conf.h> 32 #include <sys/rman.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/resource.h> 36 #include <sys/systm.h> 37 38 #include <machine/bus.h> 39 #include <dev/ofw/ofw_bus_subr.h> 40 41 #define AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET 0x4000 42 #define AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET 0x5000 43 #define AL_CCU_SPECULATION_CONTROL_OFFSET 0x4 44 45 static struct resource_spec al_ccu_spec[] = { 46 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 47 { -1, 0 } 48 }; 49 50 struct al_ccu_softc { 51 struct resource *res; 52 }; 53 54 static int al_ccu_probe(device_t dev); 55 static int al_ccu_attach(device_t dev); 56 static int al_ccu_detach(device_t dev); 57 58 static device_method_t al_ccu_methods[] = { 59 DEVMETHOD(device_probe, al_ccu_probe), 60 DEVMETHOD(device_attach, al_ccu_attach), 61 DEVMETHOD(device_detach, al_ccu_detach), 62 { 0, 0 } 63 }; 64 65 static driver_t al_ccu_driver = { 66 "ccu", 67 al_ccu_methods, 68 sizeof(struct al_ccu_softc) 69 }; 70 71 EARLY_DRIVER_MODULE(al_ccu, simplebus, al_ccu_driver, 0, 0, 72 BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE); 73 EARLY_DRIVER_MODULE(al_ccu, ofwbus, al_ccu_driver, 0, 0, 74 BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE); 75 76 static int 77 al_ccu_probe(device_t dev) 78 { 79 80 if (!ofw_bus_status_okay(dev)) 81 return (ENXIO); 82 83 if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-ccu")) 84 return (ENXIO); 85 86 device_set_desc(dev, "Alpine CCU"); 87 88 return (BUS_PROBE_DEFAULT); 89 } 90 91 static int 92 al_ccu_attach(device_t dev) 93 { 94 struct al_ccu_softc *sc; 95 int err; 96 97 sc = device_get_softc(dev); 98 99 err = bus_alloc_resources(dev, al_ccu_spec, &sc->res); 100 if (err != 0) { 101 device_printf(dev, "could not allocate resources\n"); 102 return (err); 103 } 104 105 /* Enable cache snoop */ 106 bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET, 1); 107 bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET, 1); 108 109 /* Disable speculative fetches from masters */ 110 bus_write_4(sc->res, AL_CCU_SPECULATION_CONTROL_OFFSET, 7); 111 112 return (0); 113 } 114 115 static int 116 al_ccu_detach(device_t dev) 117 { 118 struct al_ccu_softc *sc; 119 120 sc = device_get_softc(dev); 121 122 bus_release_resources(dev, al_ccu_spec, &sc->res); 123 124 return (0); 125 } 126