1 /*- 2 * Copyright (c) 2017-2020 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 * $FreeBSD: head/sys/dev/amdsmn/amdsmn.c 366136 2020-09-25 04:16:28Z cem $ 27 */ 28 29 /* 30 * Driver for the AMD Family 15h and 17h CPU System Management Network. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/bus.h> 35 #include <sys/conf.h> 36 #include <sys/lock.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/mutex.h> 40 #include <sys/sysctl.h> 41 #include <sys/systm.h> 42 43 #include <machine/cpufunc.h> 44 #include <machine/cputypes.h> 45 #include <machine/md_var.h> 46 #include <machine/specialreg.h> 47 48 #include <bus/pci/pcivar.h> 49 #include <bus/pci/pci_cfgreg.h> 50 51 #include <dev/powermng/amdsmn/amdsmn.h> 52 53 #define F15H_SMN_ADDR_REG 0xb8 54 #define F15H_SMN_DATA_REG 0xbc 55 #define F17H_SMN_ADDR_REG 0x60 56 #define F17H_SMN_DATA_REG 0x64 57 58 #define PCI_DEVICE_ID_AMD_15H_M60H_ROOT 0x1576 59 #define PCI_DEVICE_ID_AMD_17H_ROOT 0x1450 60 #define PCI_DEVICE_ID_AMD_17H_M10H_ROOT 0x15d0 61 #define PCI_DEVICE_ID_AMD_17H_M30H_ROOT 0x1480 /* Also M70H. */ 62 #define PCI_DEVICE_ID_AMD_17H_M60H_ROOT 0x1630 63 64 struct pciid; 65 struct amdsmn_softc { 66 struct lock 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 .amdsmn_vendorid = CPU_VENDOR_AMD, 102 .amdsmn_deviceid = PCI_DEVICE_ID_AMD_17H_M60H_ROOT, 103 .amdsmn_addr_reg = F17H_SMN_ADDR_REG, 104 .amdsmn_data_reg = F17H_SMN_DATA_REG, 105 }, 106 }; 107 108 /* 109 * Device methods. 110 */ 111 static void amdsmn_identify(driver_t *driver, device_t parent); 112 static int amdsmn_probe(device_t dev); 113 static int amdsmn_attach(device_t dev); 114 static int amdsmn_detach(device_t dev); 115 116 static device_method_t amdsmn_methods[] = { 117 /* Device interface */ 118 DEVMETHOD(device_identify, amdsmn_identify), 119 DEVMETHOD(device_probe, amdsmn_probe), 120 DEVMETHOD(device_attach, amdsmn_attach), 121 DEVMETHOD(device_detach, amdsmn_detach), 122 DEVMETHOD_END 123 }; 124 125 static driver_t amdsmn_driver = { 126 "amdsmn", 127 amdsmn_methods, 128 sizeof(struct amdsmn_softc), 129 }; 130 131 static devclass_t amdsmn_devclass; 132 DRIVER_MODULE(amdsmn, hostb, amdsmn_driver, amdsmn_devclass, NULL, NULL); 133 MODULE_VERSION(amdsmn, 1); 134 #if !defined(__DragonFly__) 135 MODULE_PNP_INFO("U16:vendor;U16:device", pci, amdsmn, amdsmn_ids, 136 nitems(amdsmn_ids)); 137 #endif 138 139 static bool 140 amdsmn_match(device_t parent, const struct pciid **pciid_out) 141 { 142 uint16_t vendor, device; 143 size_t i; 144 145 vendor = pci_get_vendor(parent); 146 device = pci_get_device(parent); 147 148 for (i = 0; i < nitems(amdsmn_ids); i++) { 149 if (vendor == amdsmn_ids[i].amdsmn_vendorid && 150 device == amdsmn_ids[i].amdsmn_deviceid) { 151 if (pciid_out != NULL) 152 *pciid_out = &amdsmn_ids[i]; 153 return (true); 154 } 155 } 156 return (false); 157 } 158 159 static void 160 amdsmn_identify(driver_t *driver, device_t parent) 161 { 162 device_t child; 163 164 /* Make sure we're not being doubly invoked. */ 165 if (device_find_child(parent, "amdsmn", -1) != NULL) 166 return; 167 if (!amdsmn_match(parent, NULL)) 168 return; 169 170 child = device_add_child(parent, "amdsmn", -1); 171 if (child == NULL) 172 device_printf(parent, "add amdsmn child failed\n"); 173 } 174 175 static int 176 amdsmn_probe(device_t dev) 177 { 178 uint32_t family; 179 char buf[64]; 180 181 if (resource_disabled("amdsmn", 0)) 182 return (ENXIO); 183 if (!amdsmn_match(device_get_parent(dev), NULL)) 184 return (ENXIO); 185 186 family = CPUID_TO_FAMILY(cpu_id); 187 188 switch (family) { 189 case 0x15: 190 case 0x17: 191 case 0x19: 192 break; 193 default: 194 return (ENXIO); 195 } 196 ksnprintf(buf, sizeof(buf), "AMD Family %xh System Management Network", 197 family); 198 device_set_desc_copy(dev, buf); 199 200 return (BUS_PROBE_GENERIC); 201 } 202 203 static int 204 amdsmn_attach(device_t dev) 205 { 206 struct amdsmn_softc *sc = device_get_softc(dev); 207 208 if (!amdsmn_match(device_get_parent(dev), &sc->smn_pciid)) 209 return (ENXIO); 210 211 lockinit(&sc->smn_lock, device_get_nameunit(dev), 0, 0); 212 return (0); 213 } 214 215 int 216 amdsmn_detach(device_t dev) 217 { 218 struct amdsmn_softc *sc = device_get_softc(dev); 219 220 lockuninit(&sc->smn_lock); 221 return (0); 222 } 223 224 int 225 amdsmn_read(device_t dev, uint32_t addr, uint32_t *value) 226 { 227 struct amdsmn_softc *sc = device_get_softc(dev); 228 device_t parent; 229 230 parent = device_get_parent(dev); 231 232 lockmgr(&sc->smn_lock, LK_EXCLUSIVE); 233 pci_write_config(parent, sc->smn_pciid->amdsmn_addr_reg, addr, 4); 234 *value = pci_read_config(parent, sc->smn_pciid->amdsmn_data_reg, 4); 235 lockmgr(&sc->smn_lock, LK_RELEASE); 236 237 return (0); 238 } 239 240 int 241 amdsmn_write(device_t dev, uint32_t addr, uint32_t value) 242 { 243 struct amdsmn_softc *sc = device_get_softc(dev); 244 device_t parent; 245 246 parent = device_get_parent(dev); 247 248 lockmgr(&sc->smn_lock, LK_EXCLUSIVE); 249 pci_write_config(parent, sc->smn_pciid->amdsmn_addr_reg, addr, 4); 250 pci_write_config(parent, sc->smn_pciid->amdsmn_data_reg, value, 4); 251 lockmgr(&sc->smn_lock, LK_RELEASE); 252 253 return (0); 254 } 255