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 } 132