amdsmn.c revision 329767
1/*- 2 * Copyright (c) 2017 Conrad Meyer <cem@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 17 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 18 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 20 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 23 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 24 * POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27/* 28 * Driver for the AMD Family 17h CPU System Management Network. 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: stable/11/sys/dev/amdsmn/amdsmn.c 329767 2018-02-22 00:36:12Z truckman $"); 33 34#include <sys/param.h> 35#include <sys/bus.h> 36#include <sys/conf.h> 37#include <sys/lock.h> 38#include <sys/kernel.h> 39#include <sys/module.h> 40#include <sys/mutex.h> 41#include <sys/sysctl.h> 42#include <sys/systm.h> 43 44#include <machine/cpufunc.h> 45#include <machine/md_var.h> 46#include <machine/specialreg.h> 47 48#include <dev/pci/pcivar.h> 49#include <x86/pci_cfgreg.h> 50 51#include <dev/amdsmn/amdsmn.h> 52 53#define SMN_ADDR_REG 0x60 54#define SMN_DATA_REG 0x64 55 56struct amdsmn_softc { 57 struct mtx smn_lock; 58}; 59 60static struct pciid { 61 uint32_t device_id; 62} amdsmn_ids[] = { 63 { 0x14501022 }, 64}; 65 66/* 67 * Device methods. 68 */ 69static void amdsmn_identify(driver_t *driver, device_t parent); 70static int amdsmn_probe(device_t dev); 71static int amdsmn_attach(device_t dev); 72static int amdsmn_detach(device_t dev); 73 74static device_method_t amdsmn_methods[] = { 75 /* Device interface */ 76 DEVMETHOD(device_identify, amdsmn_identify), 77 DEVMETHOD(device_probe, amdsmn_probe), 78 DEVMETHOD(device_attach, amdsmn_attach), 79 DEVMETHOD(device_detach, amdsmn_detach), 80 DEVMETHOD_END 81}; 82 83static driver_t amdsmn_driver = { 84 "amdsmn", 85 amdsmn_methods, 86 sizeof(struct amdsmn_softc), 87}; 88 89static devclass_t amdsmn_devclass; 90DRIVER_MODULE(amdsmn, hostb, amdsmn_driver, amdsmn_devclass, NULL, NULL); 91MODULE_VERSION(amdsmn, 1); 92 93static bool 94amdsmn_match(device_t parent) 95{ 96 uint32_t devid; 97 size_t i; 98 99 devid = pci_get_devid(parent); 100 for (i = 0; i < nitems(amdsmn_ids); i++) 101 if (amdsmn_ids[i].device_id == devid) 102 return (true); 103 return (false); 104} 105 106static void 107amdsmn_identify(driver_t *driver, device_t parent) 108{ 109 device_t child; 110 111 /* Make sure we're not being doubly invoked. */ 112 if (device_find_child(parent, "amdsmn", -1) != NULL) 113 return; 114 if (!amdsmn_match(parent)) 115 return; 116 117 child = device_add_child(parent, "amdsmn", -1); 118 if (child == NULL) 119 device_printf(parent, "add amdsmn child failed\n"); 120} 121 122static int 123amdsmn_probe(device_t dev) 124{ 125 uint32_t family; 126 127 if (resource_disabled("amdsmn", 0)) 128 return (ENXIO); 129 if (!amdsmn_match(device_get_parent(dev))) 130 return (ENXIO); 131 132 family = CPUID_TO_FAMILY(cpu_id); 133 134 switch (family) { 135 case 0x17: 136 break; 137 default: 138 return (ENXIO); 139 } 140 device_set_desc(dev, "AMD Family 17h System Management Network"); 141 142 return (BUS_PROBE_GENERIC); 143} 144 145static int 146amdsmn_attach(device_t dev) 147{ 148 struct amdsmn_softc *sc = device_get_softc(dev); 149 150 mtx_init(&sc->smn_lock, "SMN mtx", "SMN", MTX_DEF); 151 return (0); 152} 153 154int 155amdsmn_detach(device_t dev) 156{ 157 struct amdsmn_softc *sc = device_get_softc(dev); 158 159 mtx_destroy(&sc->smn_lock); 160 return (0); 161} 162 163int 164amdsmn_read(device_t dev, uint32_t addr, uint32_t *value) 165{ 166 struct amdsmn_softc *sc = device_get_softc(dev); 167 device_t parent; 168 169 parent = device_get_parent(dev); 170 171 mtx_lock(&sc->smn_lock); 172 pci_write_config(parent, SMN_ADDR_REG, addr, 4); 173 *value = pci_read_config(parent, SMN_DATA_REG, 4); 174 mtx_unlock(&sc->smn_lock); 175 176 return (0); 177} 178 179int 180amdsmn_write(device_t dev, uint32_t addr, uint32_t value) 181{ 182 struct amdsmn_softc *sc = device_get_softc(dev); 183 device_t parent; 184 185 parent = device_get_parent(dev); 186 187 mtx_lock(&sc->smn_lock); 188 pci_write_config(parent, SMN_ADDR_REG, addr, 4); 189 pci_write_config(parent, SMN_DATA_REG, value, 4); 190 mtx_unlock(&sc->smn_lock); 191 192 return (0); 193} 194