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 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/bus.h> 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 #include <sys/malloc.h> 42 #include <sys/rman.h> 43 #include <sys/timeet.h> 44 #include <sys/timetc.h> 45 #include <sys/conf.h> 46 #include <sys/uio.h> 47 48 #include <dev/fdt/fdt_common.h> 49 #include <dev/ofw/openfirm.h> 50 #include <dev/ofw/ofw_bus.h> 51 #include <dev/ofw/ofw_bus_subr.h> 52 53 #include <machine/bus.h> 54 #include <machine/fdt.h> 55 #include <machine/cpu.h> 56 #include <machine/intr.h> 57 58 struct beri_mem_softc { 59 struct resource *res[1]; 60 struct cdev *mem_cdev; 61 device_t dev; 62 int mem_size; 63 int mem_start; 64 }; 65 66 static struct resource_spec beri_mem_spec[] = { 67 { SYS_RES_MEMORY, 0, RF_ACTIVE }, 68 { -1, 0 } 69 }; 70 71 static int 72 mem_open(struct cdev *dev, int flags __unused, 73 int fmt __unused, struct thread *td __unused) 74 { 75 struct beri_mem_softc *sc; 76 77 sc = dev->si_drv1; 78 79 return (0); 80 } 81 82 static int 83 mem_close(struct cdev *dev, int flags __unused, 84 int fmt __unused, struct thread *td __unused) 85 { 86 struct beri_mem_softc *sc; 87 88 sc = dev->si_drv1; 89 90 return (0); 91 } 92 93 static int 94 mem_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 95 struct thread *td) 96 { 97 98 return (0); 99 } 100 101 static int 102 mem_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr, int nprot, 103 vm_memattr_t *memattr) 104 { 105 struct beri_mem_softc *sc; 106 107 sc = dev->si_drv1; 108 109 if (offset < sc->mem_size) { 110 *paddr = sc->mem_start + offset; 111 return (0); 112 } 113 114 return (EINVAL); 115 } 116 117 static struct cdevsw mem_cdevsw = { 118 .d_version = D_VERSION, 119 .d_open = mem_open, 120 .d_close = mem_close, 121 .d_ioctl = mem_ioctl, 122 .d_mmap = mem_mmap, 123 .d_name = "BERI memory", 124 }; 125 126 static int 127 beri_mem_probe(device_t dev) 128 { 129 130 if (!ofw_bus_status_okay(dev)) 131 return (ENXIO); 132 133 if (!ofw_bus_is_compatible(dev, "sri-cambridge,beri-mem")) 134 return (ENXIO); 135 136 device_set_desc(dev, "BERI memory"); 137 return (BUS_PROBE_DEFAULT); 138 } 139 140 static int 141 beri_mem_attach(device_t dev) 142 { 143 struct beri_mem_softc *sc; 144 145 sc = device_get_softc(dev); 146 sc->dev = dev; 147 148 if (bus_alloc_resources(dev, beri_mem_spec, sc->res)) { 149 device_printf(dev, "could not allocate resources\n"); 150 return (ENXIO); 151 } 152 153 /* Memory info */ 154 sc->mem_size = rman_get_size(sc->res[0]); 155 sc->mem_start = rman_get_start(sc->res[0]); 156 157 sc->mem_cdev = make_dev(&mem_cdevsw, 0, UID_ROOT, GID_WHEEL, 158 0600, "beri_mem"); 159 160 if (sc->mem_cdev == NULL) { 161 device_printf(dev, "Failed to create character device.\n"); 162 return (ENXIO); 163 } 164 165 sc->mem_cdev->si_drv1 = sc; 166 167 return (0); 168 } 169 170 static device_method_t beri_mem_methods[] = { 171 DEVMETHOD(device_probe, beri_mem_probe), 172 DEVMETHOD(device_attach, beri_mem_attach), 173 { 0, 0 } 174 }; 175 176 static driver_t beri_mem_driver = { 177 "beri_mem", 178 beri_mem_methods, 179 sizeof(struct beri_mem_softc), 180 }; 181 182 DRIVER_MODULE(beri_mem, simplebus, beri_mem_driver, 0, 0); 183