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 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, F19H M00H/M20H */ 63#define PCI_DEVICE_ID_AMD_17H_M60H_ROOT 0x1630 64 65struct pciid; 66struct amdsmn_softc { 67 struct mtx smn_lock; 68 const struct pciid *smn_pciid; 69}; 70 71static const struct pciid { 72 uint16_t amdsmn_vendorid; 73 uint16_t amdsmn_deviceid; 74 uint8_t amdsmn_addr_reg; 75 uint8_t amdsmn_data_reg; 76} amdsmn_ids[] = { 77 { 78 .amdsmn_vendorid = CPU_VENDOR_AMD, 79 .amdsmn_deviceid = PCI_DEVICE_ID_AMD_15H_M60H_ROOT, 80 .amdsmn_addr_reg = F15H_SMN_ADDR_REG, 81 .amdsmn_data_reg = F15H_SMN_DATA_REG, 82 }, 83 { 84 .amdsmn_vendorid = CPU_VENDOR_AMD, 85 .amdsmn_deviceid = PCI_DEVICE_ID_AMD_17H_ROOT, 86 .amdsmn_addr_reg = F17H_SMN_ADDR_REG, 87 .amdsmn_data_reg = F17H_SMN_DATA_REG, 88 }, 89 { 90 .amdsmn_vendorid = CPU_VENDOR_AMD, 91 .amdsmn_deviceid = PCI_DEVICE_ID_AMD_17H_M10H_ROOT, 92 .amdsmn_addr_reg = F17H_SMN_ADDR_REG, 93 .amdsmn_data_reg = F17H_SMN_DATA_REG, 94 }, 95 { 96 .amdsmn_vendorid = CPU_VENDOR_AMD, 97 .amdsmn_deviceid = PCI_DEVICE_ID_AMD_17H_M30H_ROOT, 98 .amdsmn_addr_reg = F17H_SMN_ADDR_REG, 99 .amdsmn_data_reg = F17H_SMN_DATA_REG, 100 }, 101 { 102 .amdsmn_vendorid = CPU_VENDOR_AMD, 103 .amdsmn_deviceid = PCI_DEVICE_ID_AMD_17H_M60H_ROOT, 104 .amdsmn_addr_reg = F17H_SMN_ADDR_REG, 105 .amdsmn_data_reg = F17H_SMN_DATA_REG, 106 }, 107}; 108 109/* 110 * Device methods. 111 */ 112static void amdsmn_identify(driver_t *driver, device_t parent); 113static int amdsmn_probe(device_t dev); 114static int amdsmn_attach(device_t dev); 115static int amdsmn_detach(device_t dev); 116 117static device_method_t amdsmn_methods[] = { 118 /* Device interface */ 119 DEVMETHOD(device_identify, amdsmn_identify), 120 DEVMETHOD(device_probe, amdsmn_probe), 121 DEVMETHOD(device_attach, amdsmn_attach), 122 DEVMETHOD(device_detach, amdsmn_detach), 123 DEVMETHOD_END 124}; 125 126static driver_t amdsmn_driver = { 127 "amdsmn", 128 amdsmn_methods, 129 sizeof(struct amdsmn_softc), 130}; 131 132static devclass_t amdsmn_devclass; 133DRIVER_MODULE(amdsmn, hostb, amdsmn_driver, amdsmn_devclass, NULL, NULL); 134MODULE_VERSION(amdsmn, 1); 135MODULE_PNP_INFO("U16:vendor;U16:device", pci, amdsmn, amdsmn_ids, 136 nitems(amdsmn_ids)); 137 138static bool 139amdsmn_match(device_t parent, const struct pciid **pciid_out) 140{ 141 uint16_t vendor, device; 142 size_t i; 143 144 vendor = pci_get_vendor(parent); 145 device = pci_get_device(parent); 146 147 for (i = 0; i < nitems(amdsmn_ids); i++) { 148 if (vendor == amdsmn_ids[i].amdsmn_vendorid && 149 device == amdsmn_ids[i].amdsmn_deviceid) { 150 if (pciid_out != NULL) 151 *pciid_out = &amdsmn_ids[i]; 152 return (true); 153 } 154 } 155 return (false); 156} 157 158static void 159amdsmn_identify(driver_t *driver, device_t parent) 160{ 161 device_t child; 162 163 /* Make sure we're not being doubly invoked. */ 164 if (device_find_child(parent, "amdsmn", -1) != NULL) 165 return; 166 if (!amdsmn_match(parent, NULL)) 167 return; 168 169 child = device_add_child(parent, "amdsmn", -1); 170 if (child == NULL) 171 device_printf(parent, "add amdsmn child failed\n"); 172} 173 174static int 175amdsmn_probe(device_t dev) 176{ 177 uint32_t family; 178 char buf[64]; 179 180 if (resource_disabled("amdsmn", 0)) 181 return (ENXIO); 182 if (!amdsmn_match(device_get_parent(dev), NULL)) 183 return (ENXIO); 184 185 family = CPUID_TO_FAMILY(cpu_id); 186 187 switch (family) { 188 case 0x15: 189 case 0x17: 190 case 0x19: 191 break; 192 default: 193 return (ENXIO); 194 } 195 snprintf(buf, sizeof(buf), "AMD Family %xh System Management Network", 196 family); 197 device_set_desc_copy(dev, buf); 198 199 return (BUS_PROBE_GENERIC); 200} 201 202static int 203amdsmn_attach(device_t dev) 204{ 205 struct amdsmn_softc *sc = device_get_softc(dev); 206 207 if (!amdsmn_match(device_get_parent(dev), &sc->smn_pciid)) 208 return (ENXIO); 209 210 mtx_init(&sc->smn_lock, "SMN mtx", "SMN", MTX_DEF); 211 return (0); 212} 213 214int 215amdsmn_detach(device_t dev) 216{ 217 struct amdsmn_softc *sc = device_get_softc(dev); 218 219 mtx_destroy(&sc->smn_lock); 220 return (0); 221} 222 223int 224amdsmn_read(device_t dev, uint32_t addr, uint32_t *value) 225{ 226 struct amdsmn_softc *sc = device_get_softc(dev); 227 device_t parent; 228 229 parent = device_get_parent(dev); 230 231 mtx_lock(&sc->smn_lock); 232 pci_write_config(parent, sc->smn_pciid->amdsmn_addr_reg, addr, 4); 233 *value = pci_read_config(parent, sc->smn_pciid->amdsmn_data_reg, 4); 234 mtx_unlock(&sc->smn_lock); 235 236 return (0); 237} 238 239int 240amdsmn_write(device_t dev, uint32_t addr, uint32_t value) 241{ 242 struct amdsmn_softc *sc = device_get_softc(dev); 243 device_t parent; 244 245 parent = device_get_parent(dev); 246 247 mtx_lock(&sc->smn_lock); 248 pci_write_config(parent, sc->smn_pciid->amdsmn_addr_reg, addr, 4); 249 pci_write_config(parent, sc->smn_pciid->amdsmn_data_reg, value, 4); 250 mtx_unlock(&sc->smn_lock); 251 252 return (0); 253} 254