1 /*- 2 * Copyright (c) 2000, 2001 Michael Smith 3 * Copyright (c) 2000 BSDi 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * 6.7 : Hardware Abstraction 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <contrib/dev/acpica/acpi.h> 36 37 #include <sys/kernel.h> 38 #include <machine/bus.h> 39 #include <machine/pci_cfgreg.h> 40 #include <dev/pci/pcireg.h> 41 42 /* 43 * ACPICA's rather gung-ho approach to hardware resource ownership is a little 44 * troublesome insofar as there is no easy way for us to know in advance 45 * exactly which I/O resources it's going to want to use. 46 * 47 * In order to deal with this, we ignore resource ownership entirely, and simply 48 * use the native I/O space accessor functionality. This is Evil, but it works. 49 * 50 * XXX use an intermediate #define for the tag/handle 51 */ 52 53 #ifdef __i386__ 54 #define ACPI_BUS_SPACE_IO I386_BUS_SPACE_IO 55 #define ACPI_BUS_HANDLE 0 56 #endif 57 #ifdef __ia64__ 58 #define ACPI_BUS_SPACE_IO IA64_BUS_SPACE_IO 59 #define ACPI_BUS_HANDLE 0 60 #endif 61 #ifdef __amd64__ 62 #define ACPI_BUS_SPACE_IO AMD64_BUS_SPACE_IO 63 #define ACPI_BUS_HANDLE 0 64 #endif 65 66 /* 67 * Some BIOS vendors use AML to read/write directly to IO space. This 68 * can cause a problem if such accesses interfere with the OS's access to 69 * the same ports. Windows XP and newer systems block accesses to certain 70 * IO ports. We print a message or block accesses based on a tunable. 71 */ 72 static int illegal_bios_ports[] = { 73 0x000, 0x00f, /* DMA controller 1 */ 74 0x020, 0x021, /* PIC */ 75 0x040, 0x043, /* Timer 1 */ 76 0x048, 0x04b, /* Timer 2 failsafe */ 77 0x070, 0x071, /* CMOS and RTC */ 78 0x074, 0x076, /* Extended CMOS */ 79 0x081, 0x083, /* DMA1 page registers */ 80 0x087, 0x087, /* DMA1 ch0 low page */ 81 0x089, 0x08b, /* DMA2 ch2 (0x89), ch3 low page (0x8a, 0x8b) */ 82 0x08f, 0x091, /* DMA2 low page refresh (0x8f) */ 83 /* Arb ctrl port, card select feedback (0x90, 0x91) */ 84 0x093, 0x094, /* System board setup */ 85 0x096, 0x097, /* POS channel select */ 86 0x0a0, 0x0a1, /* PIC (cascaded) */ 87 0x0c0, 0x0df, /* ISA DMA */ 88 0x4d0, 0x4d1, /* PIC ELCR (edge/level control) */ 89 0xcf8, 0xcff, /* PCI config space. Microsoft adds 0xd00 also but 90 that seems incorrect. */ 91 -1, -1 92 }; 93 94 /* Block accesses to bad IO port addresses or just print a warning. */ 95 static int block_bad_io; 96 TUNABLE_INT("debug.acpi.block_bad_io", &block_bad_io); 97 98 /* 99 * Look up bad ports in our table. Returns 0 if ok, 1 if marked bad but 100 * access is still allowed, or -1 to deny access. 101 */ 102 static int 103 acpi_os_check_port(UINT32 addr, UINT32 width) 104 { 105 int error, *port; 106 107 error = 0; 108 for (port = illegal_bios_ports; *port != -1; port += 2) { 109 if ((addr >= port[0] && addr <= port[1]) || 110 (addr < port[0] && addr + (width / 8) > port[0])) { 111 if (block_bad_io) 112 error = -1; 113 else 114 error = 1; 115 break; 116 } 117 } 118 119 return (error); 120 } 121 122 ACPI_STATUS 123 AcpiOsReadPort(ACPI_IO_ADDRESS InPort, UINT32 *Value, UINT32 Width) 124 { 125 int error; 126 127 error = acpi_os_check_port(InPort, Width); 128 if (error != 0) { 129 if (bootverbose) 130 printf("acpi: bad read from port 0x%03x (%d)\n", 131 (int)InPort, Width); 132 if (error == -1) 133 return (AE_BAD_PARAMETER); 134 } 135 136 switch (Width) { 137 case 8: 138 *(u_int8_t *)Value = bus_space_read_1(ACPI_BUS_SPACE_IO, 139 ACPI_BUS_HANDLE, InPort); 140 break; 141 case 16: 142 *(u_int16_t *)Value = bus_space_read_2(ACPI_BUS_SPACE_IO, 143 ACPI_BUS_HANDLE, InPort); 144 break; 145 case 32: 146 *(u_int32_t *)Value = bus_space_read_4(ACPI_BUS_SPACE_IO, 147 ACPI_BUS_HANDLE, InPort); 148 break; 149 default: 150 /* debug trap goes here */ 151 break; 152 } 153 154 return (AE_OK); 155 } 156 157 ACPI_STATUS 158 AcpiOsWritePort(ACPI_IO_ADDRESS OutPort, UINT32 Value, UINT32 Width) 159 { 160 int error; 161 162 error = acpi_os_check_port(OutPort, Width); 163 if (error != 0) { 164 if (bootverbose) 165 printf("acpi: bad write to port 0x%03x (%d), val %#x\n", 166 (int)OutPort, Width, Value); 167 if (error == -1) 168 return (AE_BAD_PARAMETER); 169 } 170 171 switch (Width) { 172 case 8: 173 bus_space_write_1(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 174 break; 175 case 16: 176 bus_space_write_2(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 177 break; 178 case 32: 179 bus_space_write_4(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 180 break; 181 default: 182 /* debug trap goes here */ 183 break; 184 } 185 186 return (AE_OK); 187 } 188 189 ACPI_STATUS 190 AcpiOsReadPciConfiguration(ACPI_PCI_ID *PciId, UINT32 Register, void *Value, 191 UINT32 Width) 192 { 193 u_int32_t byte_width = Width / 8; 194 u_int32_t val; 195 196 if (!pci_cfgregopen()) 197 return (AE_NOT_EXIST); 198 199 val = pci_cfgregread(PciId->Bus, PciId->Device, PciId->Function, Register, 200 byte_width); 201 switch (Width) { 202 case 8: 203 *(u_int8_t *)Value = val & 0xff; 204 break; 205 case 16: 206 *(u_int16_t *)Value = val & 0xffff; 207 break; 208 case 32: 209 *(u_int32_t *)Value = val; 210 break; 211 default: 212 /* debug trap goes here */ 213 break; 214 } 215 216 return (AE_OK); 217 } 218 219 220 ACPI_STATUS 221 AcpiOsWritePciConfiguration (ACPI_PCI_ID *PciId, UINT32 Register, 222 ACPI_INTEGER Value, UINT32 Width) 223 { 224 u_int32_t byte_width = Width / 8; 225 226 if (!pci_cfgregopen()) 227 return (AE_NOT_EXIST); 228 229 pci_cfgregwrite(PciId->Bus, PciId->Device, PciId->Function, Register, 230 Value, byte_width); 231 232 return (AE_OK); 233 } 234 235 /* XXX should use acpivar.h but too many include dependencies */ 236 extern ACPI_STATUS acpi_GetInteger(ACPI_HANDLE handle, char *path, int 237 *number); 238 239 /* 240 * Depth-first recursive case for finding the bus, given the slot/function. 241 */ 242 static int 243 acpi_bus_number(ACPI_HANDLE root, ACPI_HANDLE curr, ACPI_PCI_ID *PciId) 244 { 245 ACPI_HANDLE parent; 246 ACPI_STATUS status; 247 ACPI_OBJECT_TYPE type; 248 UINT32 adr; 249 int bus, slot, func, class, subclass, header; 250 251 /* Try to get the _BBN object of the root, otherwise assume it is 0. */ 252 bus = 0; 253 if (root == curr) { 254 status = acpi_GetInteger(root, "_BBN", &bus); 255 if (ACPI_FAILURE(status) && bootverbose) 256 printf("acpi_bus_number: root bus has no _BBN, assuming 0\n"); 257 return (bus); 258 } 259 status = AcpiGetParent(curr, &parent); 260 if (ACPI_FAILURE(status)) 261 return (bus); 262 263 /* First, recurse up the tree until we find the host bus. */ 264 bus = acpi_bus_number(root, parent, PciId); 265 266 /* Validate parent bus device type. */ 267 if (ACPI_FAILURE(AcpiGetType(parent, &type)) || type != ACPI_TYPE_DEVICE) { 268 printf("acpi_bus_number: not a device, type %d\n", type); 269 return (bus); 270 } 271 272 /* Get the parent's slot and function. */ 273 status = acpi_GetInteger(parent, "_ADR", &adr); 274 if (ACPI_FAILURE(status)) { 275 printf("acpi_bus_number: can't get _ADR\n"); 276 return (bus); 277 } 278 slot = ACPI_HIWORD(adr); 279 func = ACPI_LOWORD(adr); 280 281 /* Is this a PCI-PCI or Cardbus-PCI bridge? */ 282 class = pci_cfgregread(bus, slot, func, PCIR_CLASS, 1); 283 if (class != PCIC_BRIDGE) 284 return (bus); 285 subclass = pci_cfgregread(bus, slot, func, PCIR_SUBCLASS, 1); 286 287 /* Find the header type, masking off the multifunction bit. */ 288 header = pci_cfgregread(bus, slot, func, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE; 289 if (header == PCIM_HDRTYPE_BRIDGE && subclass == PCIS_BRIDGE_PCI) 290 bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_1, 1); 291 if (header == PCIM_HDRTYPE_CARDBUS && subclass == PCIS_BRIDGE_CARDBUS) 292 bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_2, 1); 293 return (bus); 294 } 295 296 /* 297 * Find the bus number for a device 298 * 299 * rhandle: handle for the root bus 300 * chandle: handle for the device 301 * PciId: pointer to device slot and function, we fill out bus 302 */ 303 void 304 AcpiOsDerivePciId(ACPI_HANDLE rhandle, ACPI_HANDLE chandle, ACPI_PCI_ID **PciId) 305 { 306 ACPI_HANDLE parent; 307 ACPI_STATUS status; 308 int bus; 309 310 if (pci_cfgregopen() == 0) 311 panic("AcpiOsDerivePciId unable to initialize pci bus"); 312 313 /* Try to read _BBN for bus number if we're at the root */ 314 bus = 0; 315 if (rhandle == chandle) { 316 status = acpi_GetInteger(rhandle, "_BBN", &bus); 317 if (ACPI_FAILURE(status) && bootverbose) 318 printf("AcpiOsDerivePciId: root bus has no _BBN, assuming 0\n"); 319 } 320 321 /* 322 * Get the parent handle and call the recursive case. It is not 323 * clear why we seem to be getting a chandle that points to a child 324 * of the desired slot/function but passing in the parent handle 325 * here works. 326 */ 327 if (ACPI_SUCCESS(AcpiGetParent(chandle, &parent))) 328 bus = acpi_bus_number(rhandle, parent, *PciId); 329 (*PciId)->Bus = bus; 330 if (bootverbose) { 331 printf("AcpiOsDerivePciId: bus %d dev %d func %d\n", 332 (*PciId)->Bus, (*PciId)->Device, (*PciId)->Function); 333 } 334 } 335