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 { 0, 0 } 66 }; 67 68 static driver_t al_ccu_driver = { 69 "ccu", 70 al_ccu_methods, 71 sizeof(struct al_ccu_softc) 72 }; 73 74 EARLY_DRIVER_MODULE(al_ccu, simplebus, al_ccu_driver, 0, 0, 75 BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE); 76 EARLY_DRIVER_MODULE(al_ccu, ofwbus, al_ccu_driver, 0, 0, 77 BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE); 78 79 static int 80 al_ccu_probe(device_t dev) 81 { 82 83 if (!ofw_bus_status_okay(dev)) 84 return (ENXIO); 85 86 if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-ccu")) 87 return (ENXIO); 88 89 device_set_desc(dev, "Alpine CCU"); 90 91 return (BUS_PROBE_DEFAULT); 92 } 93 94 static int 95 al_ccu_attach(device_t dev) 96 { 97 struct al_ccu_softc *sc; 98 int err; 99 100 sc = device_get_softc(dev); 101 102 err = bus_alloc_resources(dev, al_ccu_spec, &sc->res); 103 if (err != 0) { 104 device_printf(dev, "could not allocate resources\n"); 105 return (err); 106 } 107 108 /* Enable cache snoop */ 109 bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET, 1); 110 bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET, 1); 111 112 /* Disable speculative fetches from masters */ 113 bus_write_4(sc->res, AL_CCU_SPECULATION_CONTROL_OFFSET, 7); 114 115 return (0); 116 } 117 118 static int 119 al_ccu_detach(device_t dev) 120 { 121 struct al_ccu_softc *sc; 122 123 sc = device_get_softc(dev); 124 125 bus_release_resources(dev, al_ccu_spec, &sc->res); 126 127 return (0); 128 } 129