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 #include <sys/param.h> 31 #include <sys/bus.h> 32 #include <sys/conf.h> 33 #include <sys/rman.h> 34 #include <sys/kernel.h> 35 #include <sys/module.h> 36 #include <sys/resource.h> 37 #include <sys/systm.h> 38 39 #include <machine/bus.h> 40 #include <dev/ofw/ofw_bus_subr.h> 41 42 #define AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET 0x4000 43 #define AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET 0x5000 44 #define AL_CCU_SPECULATION_CONTROL_OFFSET 0x4 45 46 static struct resource_spec al_ccu_spec[] = { 47 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 48 { -1, 0 } 49 }; 50 51 struct al_ccu_softc { 52 struct resource *res; 53 }; 54 55 static int al_ccu_probe(device_t dev); 56 static int al_ccu_attach(device_t dev); 57 static int al_ccu_detach(device_t dev); 58 59 static device_method_t al_ccu_methods[] = { 60 DEVMETHOD(device_probe, al_ccu_probe), 61 DEVMETHOD(device_attach, al_ccu_attach), 62 DEVMETHOD(device_detach, al_ccu_detach), 63 { 0, 0 } 64 }; 65 66 static driver_t al_ccu_driver = { 67 "ccu", 68 al_ccu_methods, 69 sizeof(struct al_ccu_softc) 70 }; 71 72 EARLY_DRIVER_MODULE(al_ccu, simplebus, al_ccu_driver, 0, 0, 73 BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE); 74 EARLY_DRIVER_MODULE(al_ccu, ofwbus, al_ccu_driver, 0, 0, 75 BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE); 76 77 static int 78 al_ccu_probe(device_t dev) 79 { 80 81 if (!ofw_bus_status_okay(dev)) 82 return (ENXIO); 83 84 if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-ccu")) 85 return (ENXIO); 86 87 device_set_desc(dev, "Alpine CCU"); 88 89 return (BUS_PROBE_DEFAULT); 90 } 91 92 static int 93 al_ccu_attach(device_t dev) 94 { 95 struct al_ccu_softc *sc; 96 int err; 97 98 sc = device_get_softc(dev); 99 100 err = bus_alloc_resources(dev, al_ccu_spec, &sc->res); 101 if (err != 0) { 102 device_printf(dev, "could not allocate resources\n"); 103 return (err); 104 } 105 106 /* Enable cache snoop */ 107 bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET, 1); 108 bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET, 1); 109 110 /* Disable speculative fetches from masters */ 111 bus_write_4(sc->res, AL_CCU_SPECULATION_CONTROL_OFFSET, 7); 112 113 return (0); 114 } 115 116 static int 117 al_ccu_detach(device_t dev) 118 { 119 struct al_ccu_softc *sc; 120 121 sc = device_get_softc(dev); 122 123 bus_release_resources(dev, al_ccu_spec, &sc->res); 124 125 return (0); 126 } 127