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("$FreeBSD$"); 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/cputypes.h> 46 #include <machine/md_var.h> 47 #include <machine/specialreg.h> 48 49 #include <dev/pci/pcivar.h> 50 #include <x86/pci_cfgreg.h> 51 52 #include <dev/amdsmn/amdsmn.h> 53 54 #define SMN_ADDR_REG 0x60 55 #define SMN_DATA_REG 0x64 56 57 #define PCI_DEVICE_ID_AMD_17H_ROOT 0x1450 58 #define PCI_DEVICE_ID_AMD_17H_ROOT_DF_F3 0x1463 59 #define PCI_DEVICE_ID_AMD_17H_M10H_ROOT 0x15d0 60 #define PCI_DEVICE_ID_AMD_17H_M10H_ROOT_DF_F3 0x15eb 61 62 struct amdsmn_softc { 63 struct mtx smn_lock; 64 }; 65 66 static struct pciid { 67 uint16_t amdsmn_vendorid; 68 uint16_t amdsmn_deviceid; 69 } amdsmn_ids[] = { 70 { CPU_VENDOR_AMD, PCI_DEVICE_ID_AMD_17H_ROOT }, 71 { CPU_VENDOR_AMD, PCI_DEVICE_ID_AMD_17H_M10H_ROOT }, 72 }; 73 74 /* 75 * Device methods. 76 */ 77 static void amdsmn_identify(driver_t *driver, device_t parent); 78 static int amdsmn_probe(device_t dev); 79 static int amdsmn_attach(device_t dev); 80 static int amdsmn_detach(device_t dev); 81 82 static device_method_t amdsmn_methods[] = { 83 /* Device interface */ 84 DEVMETHOD(device_identify, amdsmn_identify), 85 DEVMETHOD(device_probe, amdsmn_probe), 86 DEVMETHOD(device_attach, amdsmn_attach), 87 DEVMETHOD(device_detach, amdsmn_detach), 88 DEVMETHOD_END 89 }; 90 91 static driver_t amdsmn_driver = { 92 "amdsmn", 93 amdsmn_methods, 94 sizeof(struct amdsmn_softc), 95 }; 96 97 static devclass_t amdsmn_devclass; 98 DRIVER_MODULE(amdsmn, hostb, amdsmn_driver, amdsmn_devclass, NULL, NULL); 99 MODULE_VERSION(amdsmn, 1); 100 MODULE_PNP_INFO("U16:vendor;U16:device", pci, amdsmn, amdsmn_ids, 101 nitems(amdsmn_ids)); 102 103 static bool 104 amdsmn_match(device_t parent) 105 { 106 uint16_t vendor, device; 107 size_t i; 108 109 vendor = pci_get_vendor(parent); 110 device = pci_get_device(parent); 111 112 for (i = 0; i < nitems(amdsmn_ids); i++) 113 if (vendor == amdsmn_ids[i].amdsmn_vendorid && 114 device == amdsmn_ids[i].amdsmn_deviceid) 115 return (true); 116 return (false); 117 } 118 119 static void 120 amdsmn_identify(driver_t *driver, device_t parent) 121 { 122 device_t child; 123 124 /* Make sure we're not being doubly invoked. */ 125 if (device_find_child(parent, "amdsmn", -1) != NULL) 126 return; 127 if (!amdsmn_match(parent)) 128 return; 129 130 child = device_add_child(parent, "amdsmn", -1); 131 if (child == NULL) 132 device_printf(parent, "add amdsmn child failed\n"); 133 } 134 135 static int 136 amdsmn_probe(device_t dev) 137 { 138 uint32_t family; 139 140 if (resource_disabled("amdsmn", 0)) 141 return (ENXIO); 142 if (!amdsmn_match(device_get_parent(dev))) 143 return (ENXIO); 144 145 family = CPUID_TO_FAMILY(cpu_id); 146 147 switch (family) { 148 case 0x17: 149 break; 150 default: 151 return (ENXIO); 152 } 153 device_set_desc(dev, "AMD Family 17h System Management Network"); 154 155 return (BUS_PROBE_GENERIC); 156 } 157 158 static int 159 amdsmn_attach(device_t dev) 160 { 161 struct amdsmn_softc *sc = device_get_softc(dev); 162 163 mtx_init(&sc->smn_lock, "SMN mtx", "SMN", MTX_DEF); 164 return (0); 165 } 166 167 int 168 amdsmn_detach(device_t dev) 169 { 170 struct amdsmn_softc *sc = device_get_softc(dev); 171 172 mtx_destroy(&sc->smn_lock); 173 return (0); 174 } 175 176 int 177 amdsmn_read(device_t dev, uint32_t addr, uint32_t *value) 178 { 179 struct amdsmn_softc *sc = device_get_softc(dev); 180 device_t parent; 181 182 parent = device_get_parent(dev); 183 184 mtx_lock(&sc->smn_lock); 185 pci_write_config(parent, SMN_ADDR_REG, addr, 4); 186 *value = pci_read_config(parent, SMN_DATA_REG, 4); 187 mtx_unlock(&sc->smn_lock); 188 189 return (0); 190 } 191 192 int 193 amdsmn_write(device_t dev, uint32_t addr, uint32_t value) 194 { 195 struct amdsmn_softc *sc = device_get_softc(dev); 196 device_t parent; 197 198 parent = device_get_parent(dev); 199 200 mtx_lock(&sc->smn_lock); 201 pci_write_config(parent, SMN_ADDR_REG, addr, 4); 202 pci_write_config(parent, SMN_DATA_REG, value, 4); 203 mtx_unlock(&sc->smn_lock); 204 205 return (0); 206 } 207