1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org> 5 * Copyright (c) 2020 Jessica Clarke <jrtc27@FreeBSD.org> 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 /* 30 * RISC-V syscon driver. Used as a generic interface by QEMU's virt machine for 31 * describing the SiFive test finisher as a power and reset controller. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/bus.h> 36 #include <sys/kernel.h> 37 #include <sys/module.h> 38 #include <sys/mutex.h> 39 #include <sys/rman.h> 40 #include <machine/bus.h> 41 42 #include <dev/ofw/openfirm.h> 43 #include <dev/ofw/ofw_bus.h> 44 #include <dev/ofw/ofw_bus_subr.h> 45 46 #include <dev/extres/syscon/syscon.h> 47 #include <dev/extres/syscon/syscon_generic.h> 48 49 static struct ofw_compat_data compat_data[] = { 50 {"sifive,test0", 1}, 51 {"sifive,test1", 1}, 52 {NULL, 0} 53 }; 54 55 static int 56 riscv_syscon_probe(device_t dev) 57 { 58 59 if (!ofw_bus_status_okay(dev)) 60 return (ENXIO); 61 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 62 return (ENXIO); 63 64 device_set_desc(dev, "RISC-V syscon"); 65 return (BUS_PROBE_DEFAULT); 66 } 67 68 static device_method_t riscv_syscon_methods[] = { 69 DEVMETHOD(device_probe, riscv_syscon_probe), 70 71 DEVMETHOD_END 72 }; 73 74 DEFINE_CLASS_1(riscv_syscon, riscv_syscon_driver, riscv_syscon_methods, 75 sizeof(struct syscon_generic_softc), syscon_generic_driver); 76 77 /* riscv_syscon needs to attach prior to syscon_power */ 78 EARLY_DRIVER_MODULE(riscv_syscon, simplebus, riscv_syscon_driver, 0, 0, 79 BUS_PASS_SCHEDULER + BUS_PASS_ORDER_LAST); 80 MODULE_VERSION(riscv_syscon, 1); 81