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