1 /*- 2 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * This software was developed by SRI International and the University of 6 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) 7 * ("CTSRD"), as part of the DARPA CRASH research programme. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * BERI memory interface. 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bus.h> 41 #include <sys/kernel.h> 42 #include <sys/module.h> 43 #include <sys/malloc.h> 44 #include <sys/rman.h> 45 #include <sys/timeet.h> 46 #include <sys/timetc.h> 47 #include <sys/conf.h> 48 #include <sys/uio.h> 49 50 #include <dev/fdt/fdt_common.h> 51 #include <dev/ofw/openfirm.h> 52 #include <dev/ofw/ofw_bus.h> 53 #include <dev/ofw/ofw_bus_subr.h> 54 55 #include <machine/bus.h> 56 #include <machine/fdt.h> 57 #include <machine/cpu.h> 58 #include <machine/intr.h> 59 60 struct beri_mem_softc { 61 struct resource *res[1]; 62 struct cdev *mem_cdev; 63 device_t dev; 64 int mem_size; 65 int mem_start; 66 }; 67 68 static struct resource_spec beri_mem_spec[] = { 69 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 70 { -1, 0 } 71 }; 72 73 static int 74 mem_open(struct cdev *dev, int flags __unused, 75 int fmt __unused, struct thread *td __unused) 76 { 77 struct beri_mem_softc *sc; 78 79 sc = dev->si_drv1; 80 81 return (0); 82 } 83 84 static int 85 mem_close(struct cdev *dev, int flags __unused, 86 int fmt __unused, struct thread *td __unused) 87 { 88 struct beri_mem_softc *sc; 89 90 sc = dev->si_drv1; 91 92 return (0); 93 } 94 95 static int 96 mem_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 97 struct thread *td) 98 { 99 100 return (0); 101 } 102 103 static int 104 mem_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot, 105 vm_memattr_t *memattr) 106 { 107 struct beri_mem_softc *sc; 108 109 sc = dev->si_drv1; 110 111 if (offset < sc->mem_size) { 112 *paddr = sc->mem_start + offset; 113 return (0); 114 } 115 116 return (EINVAL); 117 } 118 119 static struct cdevsw mem_cdevsw = { 120 .d_version = D_VERSION, 121 .d_open = mem_open, 122 .d_close = mem_close, 123 .d_ioctl = mem_ioctl, 124 .d_mmap = mem_mmap, 125 .d_name = "BERI memory", 126 }; 127 128 static int 129 beri_mem_probe(device_t dev) 130 { 131 132 if (!ofw_bus_status_okay(dev)) 133 return (ENXIO); 134 135 if (!ofw_bus_is_compatible(dev, "sri-cambridge,beri-mem")) 136 return (ENXIO); 137 138 device_set_desc(dev, "BERI memory"); 139 return (BUS_PROBE_DEFAULT); 140 } 141 142 static int 143 beri_mem_attach(device_t dev) 144 { 145 struct beri_mem_softc *sc; 146 147 sc = device_get_softc(dev); 148 sc->dev = dev; 149 150 if (bus_alloc_resources(dev, beri_mem_spec, sc->res)) { 151 device_printf(dev, "could not allocate resources\n"); 152 return (ENXIO); 153 } 154 155 /* Memory info */ 156 sc->mem_size = rman_get_size(sc->res[0]); 157 sc->mem_start = rman_get_start(sc->res[0]); 158 159 sc->mem_cdev = make_dev(&mem_cdevsw, 0, UID_ROOT, GID_WHEEL, 160 0600, "beri_mem"); 161 162 if (sc->mem_cdev == NULL) { 163 device_printf(dev, "Failed to create character device.\n"); 164 return (ENXIO); 165 } 166 167 sc->mem_cdev->si_drv1 = sc; 168 169 return (0); 170 } 171 172 static device_method_t beri_mem_methods[] = { 173 DEVMETHOD(device_probe, beri_mem_probe), 174 DEVMETHOD(device_attach, beri_mem_attach), 175 { 0, 0 } 176 }; 177 178 static driver_t beri_mem_driver = { 179 "beri_mem", 180 beri_mem_methods, 181 sizeof(struct beri_mem_softc), 182 }; 183 184 DRIVER_MODULE(beri_mem, simplebus, beri_mem_driver, 0, 0); 185