1 /*- 2 * Copyright (c) 1997, Stefan Esser <se@freebsd.org> 3 * Copyright (c) 2000, Michael Smith <msmith@freebsd.org> 4 * Copyright (c) 2000, BSDi 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice unmodified, this list of conditions, and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/bus.h> 35 #include <sys/kernel.h> 36 #include <sys/malloc.h> 37 #include <sys/module.h> 38 39 #include <contrib/dev/acpica/include/acpi.h> 40 #include <contrib/dev/acpica/include/accommon.h> 41 42 #include <dev/acpica/acpivar.h> 43 44 #include <sys/pciio.h> 45 #include <dev/pci/pcireg.h> 46 #include <dev/pci/pcivar.h> 47 #include <dev/pci/pci_private.h> 48 49 #include "pcib_if.h" 50 #include "pci_if.h" 51 52 /* Hooks for the ACPI CA debugging infrastructure. */ 53 #define _COMPONENT ACPI_BUS 54 ACPI_MODULE_NAME("PCI") 55 56 struct acpi_pci_devinfo { 57 struct pci_devinfo ap_dinfo; 58 ACPI_HANDLE ap_handle; 59 int ap_flags; 60 }; 61 62 ACPI_SERIAL_DECL(pci_powerstate, "ACPI PCI power methods"); 63 64 /* Be sure that ACPI and PCI power states are equivalent. */ 65 CTASSERT(ACPI_STATE_D0 == PCI_POWERSTATE_D0); 66 CTASSERT(ACPI_STATE_D1 == PCI_POWERSTATE_D1); 67 CTASSERT(ACPI_STATE_D2 == PCI_POWERSTATE_D2); 68 CTASSERT(ACPI_STATE_D3 == PCI_POWERSTATE_D3); 69 70 static int acpi_pci_attach(device_t dev); 71 static int acpi_pci_child_location_str_method(device_t cbdev, 72 device_t child, char *buf, size_t buflen); 73 static int acpi_pci_probe(device_t dev); 74 static int acpi_pci_read_ivar(device_t dev, device_t child, int which, 75 uintptr_t *result); 76 static int acpi_pci_write_ivar(device_t dev, device_t child, int which, 77 uintptr_t value); 78 static ACPI_STATUS acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level, 79 void *context, void **status); 80 static int acpi_pci_set_powerstate_method(device_t dev, device_t child, 81 int state); 82 static void acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child); 83 84 static device_method_t acpi_pci_methods[] = { 85 /* Device interface */ 86 DEVMETHOD(device_probe, acpi_pci_probe), 87 DEVMETHOD(device_attach, acpi_pci_attach), 88 89 /* Bus interface */ 90 DEVMETHOD(bus_read_ivar, acpi_pci_read_ivar), 91 DEVMETHOD(bus_write_ivar, acpi_pci_write_ivar), 92 DEVMETHOD(bus_child_location_str, acpi_pci_child_location_str_method), 93 94 /* PCI interface */ 95 DEVMETHOD(pci_set_powerstate, acpi_pci_set_powerstate_method), 96 97 { 0, 0 } 98 }; 99 100 static devclass_t pci_devclass; 101 102 DEFINE_CLASS_1(pci, acpi_pci_driver, acpi_pci_methods, 0, pci_driver); 103 DRIVER_MODULE(acpi_pci, pcib, acpi_pci_driver, pci_devclass, 0, 0); 104 MODULE_DEPEND(acpi_pci, acpi, 1, 1, 1); 105 MODULE_DEPEND(acpi_pci, pci, 1, 1, 1); 106 MODULE_VERSION(acpi_pci, 1); 107 108 static int 109 acpi_pci_read_ivar(device_t dev, device_t child, int which, uintptr_t *result) 110 { 111 struct acpi_pci_devinfo *dinfo; 112 113 dinfo = device_get_ivars(child); 114 switch (which) { 115 case ACPI_IVAR_HANDLE: 116 *result = (uintptr_t)dinfo->ap_handle; 117 return (0); 118 case ACPI_IVAR_FLAGS: 119 *result = (uintptr_t)dinfo->ap_flags; 120 return (0); 121 } 122 return (pci_read_ivar(dev, child, which, result)); 123 } 124 125 static int 126 acpi_pci_write_ivar(device_t dev, device_t child, int which, uintptr_t value) 127 { 128 struct acpi_pci_devinfo *dinfo; 129 130 dinfo = device_get_ivars(child); 131 switch (which) { 132 case ACPI_IVAR_HANDLE: 133 dinfo->ap_handle = (ACPI_HANDLE)value; 134 return (0); 135 case ACPI_IVAR_FLAGS: 136 dinfo->ap_flags = (int)value; 137 return (0); 138 } 139 return (pci_write_ivar(dev, child, which, value)); 140 } 141 142 static int 143 acpi_pci_child_location_str_method(device_t cbdev, device_t child, char *buf, 144 size_t buflen) 145 { 146 struct acpi_pci_devinfo *dinfo = device_get_ivars(child); 147 148 pci_child_location_str_method(cbdev, child, buf, buflen); 149 150 if (dinfo->ap_handle) { 151 strlcat(buf, " handle=", buflen); 152 strlcat(buf, acpi_name(dinfo->ap_handle), buflen); 153 } 154 return (0); 155 } 156 157 /* 158 * PCI power manangement 159 */ 160 static int 161 acpi_pci_set_powerstate_method(device_t dev, device_t child, int state) 162 { 163 ACPI_HANDLE h; 164 ACPI_STATUS status; 165 int old_state, error; 166 167 error = 0; 168 if (state < ACPI_STATE_D0 || state > ACPI_STATE_D3) 169 return (EINVAL); 170 171 /* 172 * We set the state using PCI Power Management outside of setting 173 * the ACPI state. This means that when powering down a device, we 174 * first shut it down using PCI, and then using ACPI, which lets ACPI 175 * try to power down any Power Resources that are now no longer used. 176 * When powering up a device, we let ACPI set the state first so that 177 * it can enable any needed Power Resources before changing the PCI 178 * power state. 179 */ 180 ACPI_SERIAL_BEGIN(pci_powerstate); 181 old_state = pci_get_powerstate(child); 182 if (old_state < state) { 183 error = pci_set_powerstate_method(dev, child, state); 184 if (error) 185 goto out; 186 } 187 h = acpi_get_handle(child); 188 status = acpi_pwr_switch_consumer(h, state); 189 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) 190 device_printf(dev, 191 "Failed to set ACPI power state D%d on %s: %s\n", 192 state, acpi_name(h), AcpiFormatException(status)); 193 if (old_state > state) 194 error = pci_set_powerstate_method(dev, child, state); 195 196 out: 197 ACPI_SERIAL_END(pci_powerstate); 198 return (error); 199 } 200 201 static void 202 acpi_pci_update_device(ACPI_HANDLE handle, device_t pci_child) 203 { 204 ACPI_STATUS status; 205 device_t child; 206 207 /* 208 * Lookup and remove the unused device that acpi0 creates when it walks 209 * the namespace creating devices. 210 */ 211 child = acpi_get_device(handle); 212 if (child != NULL) { 213 if (device_is_alive(child)) { 214 /* 215 * The TabletPC TC1000 has a second PCI-ISA bridge 216 * that has a _HID for an acpi_sysresource device. 217 * In that case, leave ACPI-CA's device data pointing 218 * at the ACPI-enumerated device. 219 */ 220 device_printf(child, 221 "Conflicts with PCI device %d:%d:%d\n", 222 pci_get_bus(pci_child), pci_get_slot(pci_child), 223 pci_get_function(pci_child)); 224 return; 225 } 226 KASSERT(device_get_parent(child) == 227 devclass_get_device(devclass_find("acpi"), 0), 228 ("%s: child (%s)'s parent is not acpi0", __func__, 229 acpi_name(handle))); 230 device_delete_child(device_get_parent(child), child); 231 } 232 233 /* 234 * Update ACPI-CA to use the PCI enumerated device_t for this handle. 235 */ 236 status = AcpiDetachData(handle, acpi_fake_objhandler); 237 if (ACPI_FAILURE(status)) 238 printf("WARNING: Unable to detach object data from %s - %s\n", 239 acpi_name(handle), AcpiFormatException(status)); 240 status = AcpiAttachData(handle, acpi_fake_objhandler, pci_child); 241 if (ACPI_FAILURE(status)) 242 printf("WARNING: Unable to attach object data to %s - %s\n", 243 acpi_name(handle), AcpiFormatException(status)); 244 } 245 246 static ACPI_STATUS 247 acpi_pci_save_handle(ACPI_HANDLE handle, UINT32 level, void *context, 248 void **status) 249 { 250 struct acpi_pci_devinfo *dinfo; 251 device_t *devlist; 252 int devcount, i, func, slot; 253 UINT32 address; 254 255 ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__); 256 257 if (ACPI_FAILURE(acpi_GetInteger(handle, "_ADR", &address))) 258 return_ACPI_STATUS (AE_OK); 259 slot = ACPI_ADR_PCI_SLOT(address); 260 func = ACPI_ADR_PCI_FUNC(address); 261 if (device_get_children((device_t)context, &devlist, &devcount) != 0) 262 return_ACPI_STATUS (AE_OK); 263 for (i = 0; i < devcount; i++) { 264 dinfo = device_get_ivars(devlist[i]); 265 if (dinfo->ap_dinfo.cfg.func == func && 266 dinfo->ap_dinfo.cfg.slot == slot) { 267 dinfo->ap_handle = handle; 268 acpi_pci_update_device(handle, devlist[i]); 269 break; 270 } 271 } 272 free(devlist, M_TEMP); 273 return_ACPI_STATUS (AE_OK); 274 } 275 276 static int 277 acpi_pci_probe(device_t dev) 278 { 279 280 if (pcib_get_bus(dev) < 0) 281 return (ENXIO); 282 if (acpi_get_handle(dev) == NULL) 283 return (ENXIO); 284 device_set_desc(dev, "ACPI PCI bus"); 285 return (0); 286 } 287 288 static int 289 acpi_pci_attach(device_t dev) 290 { 291 int busno, domain; 292 293 /* 294 * Since there can be multiple independantly numbered PCI 295 * busses on systems with multiple PCI domains, we can't use 296 * the unit number to decide which bus we are probing. We ask 297 * the parent pcib what our domain and bus numbers are. 298 */ 299 domain = pcib_get_domain(dev); 300 busno = pcib_get_bus(dev); 301 if (bootverbose) 302 device_printf(dev, "domain=%d, physical bus=%d\n", 303 domain, busno); 304 305 /* 306 * First, PCI devices are added as in the normal PCI bus driver. 307 * Afterwards, the ACPI namespace under the bridge driver is 308 * walked to save ACPI handles to all the devices that appear in 309 * the ACPI namespace as immediate descendants of the bridge. 310 * 311 * XXX: Sometimes PCI devices show up in the ACPI namespace that 312 * pci_add_children() doesn't find. We currently just ignore 313 * these devices. 314 */ 315 pci_add_children(dev, domain, busno, sizeof(struct acpi_pci_devinfo)); 316 AcpiWalkNamespace(ACPI_TYPE_DEVICE, acpi_get_handle(dev), 1, 317 acpi_pci_save_handle, dev, NULL); 318 319 return (bus_generic_attach(dev)); 320 } 321