1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2016 Landon Fuller <landon@landonf.org> 5 * All rights reserved. 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 * without modification. 13 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 14 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 15 * redistribution must be conditioned upon including a substantially 16 * similar Disclaimer requirement for further binary redistribution. 17 * 18 * NO WARRANTY 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 22 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 23 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 24 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 27 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 29 * THE POSSIBILITY OF SUCH DAMAGES. 30 */ 31 32 #include <sys/cdefs.h> 33 /* 34 * ChipCommon attachment support for the bhnd(4) PMU driver. 35 * 36 * Supports non-AOB ("Always-on Bus") devices that map the PMU register blocks 37 * via the ChipCommon core, rather than vending a distinct PMU core on the 38 * bhnd bus. 39 */ 40 41 #include <sys/param.h> 42 #include <sys/kernel.h> 43 #include <sys/bus.h> 44 #include <sys/limits.h> 45 #include <sys/malloc.h> 46 #include <sys/module.h> 47 #include <sys/systm.h> 48 49 #include <dev/bhnd/bhnd.h> 50 51 #include <dev/bhnd/cores/pmu/bhnd_pmuvar.h> 52 #include <dev/bhnd/cores/pmu/bhnd_pmureg.h> 53 54 #include "bhnd_chipc_if.h" 55 #include "bhnd_pmu_if.h" 56 57 #include "chipcvar.h" 58 59 static int 60 bhnd_pmu_chipc_probe(device_t dev) 61 { 62 struct chipc_caps *ccaps; 63 struct chipc_softc *chipc_sc; 64 device_t chipc; 65 char desc[34]; 66 int error; 67 uint32_t pcaps; 68 uint8_t rev; 69 70 /* Look for chipc parent */ 71 chipc = device_get_parent(dev); 72 if (device_get_devclass(chipc) != devclass_find("bhnd_chipc")) 73 return (ENXIO); 74 75 /* Check the chipc PMU capability flag. */ 76 ccaps = BHND_CHIPC_GET_CAPS(chipc); 77 if (!ccaps->pmu) 78 return (ENXIO); 79 80 /* Delegate to common driver implementation */ 81 if ((error = bhnd_pmu_probe(dev)) > 0) 82 return (error); 83 84 /* Fetch PMU capability flags */ 85 chipc_sc = device_get_softc(chipc); 86 pcaps = bhnd_bus_read_4(chipc_sc->core, BHND_PMU_CAP); 87 88 /* Set description */ 89 rev = BHND_PMU_GET_BITS(pcaps, BHND_PMU_CAP_REV); 90 snprintf(desc, sizeof(desc), "Broadcom ChipCommon PMU, rev %hhu", rev); 91 device_set_desc_copy(dev, desc); 92 93 return (BUS_PROBE_NOWILDCARD); 94 } 95 96 static int 97 bhnd_pmu_chipc_attach(device_t dev) 98 { 99 struct chipc_softc *chipc_sc; 100 struct bhnd_resource *r; 101 102 /* Fetch core registers from ChipCommon parent */ 103 chipc_sc = device_get_softc(device_get_parent(dev)); 104 r = chipc_sc->core; 105 106 return (bhnd_pmu_attach(dev, r)); 107 } 108 109 static device_method_t bhnd_pmu_chipc_methods[] = { 110 /* Device interface */ 111 DEVMETHOD(device_probe, bhnd_pmu_chipc_probe), 112 DEVMETHOD(device_attach, bhnd_pmu_chipc_attach), 113 114 DEVMETHOD_END 115 }; 116 117 DEFINE_CLASS_1(bhnd_pmu, bhnd_pmu_chipc_driver, bhnd_pmu_chipc_methods, 118 sizeof(struct bhnd_pmu_softc), bhnd_pmu_driver); 119 EARLY_DRIVER_MODULE(bhnd_pmu_chipc, bhnd_chipc, bhnd_pmu_chipc_driver, 120 NULL, NULL, BUS_PASS_TIMER + BUS_PASS_ORDER_MIDDLE); 121 122 MODULE_DEPEND(bhnd_pmu_chipc, bhnd, 1, 1, 1); 123 MODULE_VERSION(bhnd_pmu_chipc, 1); 124