1 /*- 2 * Copyright (c) 2017-2019 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 15h and 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 F15H_SMN_ADDR_REG 0xb8 55 #define F15H_SMN_DATA_REG 0xbc 56 #define F17H_SMN_ADDR_REG 0x60 57 #define F17H_SMN_DATA_REG 0x64 58 59 #define PCI_DEVICE_ID_AMD_15H_M60H_ROOT 0x1576 60 #define PCI_DEVICE_ID_AMD_17H_ROOT 0x1450 61 #define PCI_DEVICE_ID_AMD_17H_M10H_ROOT 0x15d0 62 #define PCI_DEVICE_ID_AMD_17H_M30H_ROOT 0x1480 /* Also M70H. */ 63 64 struct pciid; 65 struct amdsmn_softc { 66 struct mtx smn_lock; 67 const struct pciid *smn_pciid; 68 }; 69 70 static const struct pciid { 71 uint16_t amdsmn_vendorid; 72 uint16_t amdsmn_deviceid; 73 uint8_t amdsmn_addr_reg; 74 uint8_t amdsmn_data_reg; 75 } amdsmn_ids[] = { 76 { 77 .amdsmn_vendorid = CPU_VENDOR_AMD, 78 .amdsmn_deviceid = PCI_DEVICE_ID_AMD_15H_M60H_ROOT, 79 .amdsmn_addr_reg = F15H_SMN_ADDR_REG, 80 .amdsmn_data_reg = F15H_SMN_DATA_REG, 81 }, 82 { 83 .amdsmn_vendorid = CPU_VENDOR_AMD, 84 .amdsmn_deviceid = PCI_DEVICE_ID_AMD_17H_ROOT, 85 .amdsmn_addr_reg = F17H_SMN_ADDR_REG, 86 .amdsmn_data_reg = F17H_SMN_DATA_REG, 87 }, 88 { 89 .amdsmn_vendorid = CPU_VENDOR_AMD, 90 .amdsmn_deviceid = PCI_DEVICE_ID_AMD_17H_M10H_ROOT, 91 .amdsmn_addr_reg = F17H_SMN_ADDR_REG, 92 .amdsmn_data_reg = F17H_SMN_DATA_REG, 93 }, 94 { 95 .amdsmn_vendorid = CPU_VENDOR_AMD, 96 .amdsmn_deviceid = PCI_DEVICE_ID_AMD_17H_M30H_ROOT, 97 .amdsmn_addr_reg = F17H_SMN_ADDR_REG, 98 .amdsmn_data_reg = F17H_SMN_DATA_REG, 99 }, 100 }; 101 102 /* 103 * Device methods. 104 */ 105 static void amdsmn_identify(driver_t *driver, device_t parent); 106 static int amdsmn_probe(device_t dev); 107 static int amdsmn_attach(device_t dev); 108 static int amdsmn_detach(device_t dev); 109 110 static device_method_t amdsmn_methods[] = { 111 /* Device interface */ 112 DEVMETHOD(device_identify, amdsmn_identify), 113 DEVMETHOD(device_probe, amdsmn_probe), 114 DEVMETHOD(device_attach, amdsmn_attach), 115 DEVMETHOD(device_detach, amdsmn_detach), 116 DEVMETHOD_END 117 }; 118 119 static driver_t amdsmn_driver = { 120 "amdsmn", 121 amdsmn_methods, 122 sizeof(struct amdsmn_softc), 123 }; 124 125 static devclass_t amdsmn_devclass; 126 DRIVER_MODULE(amdsmn, hostb, amdsmn_driver, amdsmn_devclass, NULL, NULL); 127 MODULE_VERSION(amdsmn, 1); 128 MODULE_PNP_INFO("U16:vendor;U16:device", pci, amdsmn, amdsmn_ids, 129 nitems(amdsmn_ids)); 130 131 static bool 132 amdsmn_match(device_t parent, const struct pciid **pciid_out) 133 { 134 uint16_t vendor, device; 135 size_t i; 136 137 vendor = pci_get_vendor(parent); 138 device = pci_get_device(parent); 139 140 for (i = 0; i < nitems(amdsmn_ids); i++) { 141 if (vendor == amdsmn_ids[i].amdsmn_vendorid && 142 device == amdsmn_ids[i].amdsmn_deviceid) { 143 if (pciid_out != NULL) 144 *pciid_out = &amdsmn_ids[i]; 145 return (true); 146 } 147 } 148 return (false); 149 } 150 151 static void 152 amdsmn_identify(driver_t *driver, device_t parent) 153 { 154 device_t child; 155 156 /* Make sure we're not being doubly invoked. */ 157 if (device_find_child(parent, "amdsmn", -1) != NULL) 158 return; 159 if (!amdsmn_match(parent, NULL)) 160 return; 161 162 child = device_add_child(parent, "amdsmn", -1); 163 if (child == NULL) 164 device_printf(parent, "add amdsmn child failed\n"); 165 } 166 167 static int 168 amdsmn_probe(device_t dev) 169 { 170 uint32_t family; 171 char buf[64]; 172 173 if (resource_disabled("amdsmn", 0)) 174 return (ENXIO); 175 if (!amdsmn_match(device_get_parent(dev), NULL)) 176 return (ENXIO); 177 178 family = CPUID_TO_FAMILY(cpu_id); 179 180 switch (family) { 181 case 0x15: 182 case 0x17: 183 break; 184 default: 185 return (ENXIO); 186 } 187 snprintf(buf, sizeof(buf), "AMD Family %xh System Management Network", 188 family); 189 device_set_desc_copy(dev, buf); 190 191 return (BUS_PROBE_GENERIC); 192 } 193 194 static int 195 amdsmn_attach(device_t dev) 196 { 197 struct amdsmn_softc *sc = device_get_softc(dev); 198 199 if (!amdsmn_match(device_get_parent(dev), &sc->smn_pciid)) 200 return (ENXIO); 201 202 mtx_init(&sc->smn_lock, "SMN mtx", "SMN", MTX_DEF); 203 return (0); 204 } 205 206 int 207 amdsmn_detach(device_t dev) 208 { 209 struct amdsmn_softc *sc = device_get_softc(dev); 210 211 mtx_destroy(&sc->smn_lock); 212 return (0); 213 } 214 215 int 216 amdsmn_read(device_t dev, uint32_t addr, uint32_t *value) 217 { 218 struct amdsmn_softc *sc = device_get_softc(dev); 219 device_t parent; 220 221 parent = device_get_parent(dev); 222 223 mtx_lock(&sc->smn_lock); 224 pci_write_config(parent, sc->smn_pciid->amdsmn_addr_reg, addr, 4); 225 *value = pci_read_config(parent, sc->smn_pciid->amdsmn_data_reg, 4); 226 mtx_unlock(&sc->smn_lock); 227 228 return (0); 229 } 230 231 int 232 amdsmn_write(device_t dev, uint32_t addr, uint32_t value) 233 { 234 struct amdsmn_softc *sc = device_get_softc(dev); 235 device_t parent; 236 237 parent = device_get_parent(dev); 238 239 mtx_lock(&sc->smn_lock); 240 pci_write_config(parent, sc->smn_pciid->amdsmn_addr_reg, addr, 4); 241 pci_write_config(parent, sc->smn_pciid->amdsmn_data_reg, value, 4); 242 mtx_unlock(&sc->smn_lock); 243 244 return (0); 245 } 246