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 * $FreeBSD$ 28 */ 29 30 /* 31 * 6.7 : Hardware Abstraction 32 */ 33 34 #include "acpi.h" 35 36 #include <machine/bus_pio.h> 37 #include <machine/bus.h> 38 #include <machine/pci_cfgreg.h> 39 #include <dev/pci/pcireg.h> 40 41 /* 42 * ACPICA's rather gung-ho approach to hardware resource ownership is a little 43 * troublesome insofar as there is no easy way for us to know in advance 44 * exactly which I/O resources it's going to want to use. 45 * 46 * In order to deal with this, we ignore resource ownership entirely, and simply 47 * use the native I/O space accessor functionality. This is Evil, but it works. 48 * 49 * XXX use an intermediate #define for the tag/handle 50 */ 51 52 #ifdef __i386__ 53 #define ACPI_BUS_SPACE_IO I386_BUS_SPACE_IO 54 #define ACPI_BUS_HANDLE 0 55 #endif 56 #ifdef __ia64__ 57 #define ACPI_BUS_SPACE_IO IA64_BUS_SPACE_IO 58 #define ACPI_BUS_HANDLE 0 59 #endif 60 61 ACPI_STATUS 62 AcpiOsReadPort ( 63 ACPI_IO_ADDRESS InPort, 64 void *Value, 65 UINT32 Width) 66 { 67 switch (Width) { 68 case 8: 69 *(u_int8_t *)Value = bus_space_read_1(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, InPort); 70 break; 71 case 16: 72 *(u_int16_t *)Value = bus_space_read_2(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, InPort); 73 break; 74 case 32: 75 *(u_int32_t *)Value = bus_space_read_4(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, InPort); 76 break; 77 default: 78 /* debug trap goes here */ 79 break; 80 } 81 82 return(AE_OK); 83 } 84 85 ACPI_STATUS 86 AcpiOsWritePort ( 87 ACPI_IO_ADDRESS OutPort, 88 ACPI_INTEGER Value, 89 UINT32 Width) 90 { 91 switch (Width) { 92 case 8: 93 bus_space_write_1(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 94 break; 95 case 16: 96 bus_space_write_2(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 97 break; 98 case 32: 99 bus_space_write_4(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 100 break; 101 default: 102 /* debug trap goes here */ 103 break; 104 } 105 106 return(AE_OK); 107 } 108 109 ACPI_STATUS 110 AcpiOsReadPciConfiguration ( 111 ACPI_PCI_ID *PciId, 112 UINT32 Register, 113 void *Value, 114 UINT32 Width) 115 { 116 u_int32_t byte_width = Width / 8; 117 u_int32_t val; 118 119 if (!pci_cfgregopen()) 120 return(AE_NOT_EXIST); 121 122 val = pci_cfgregread(PciId->Bus, PciId->Device, PciId->Function, Register, byte_width); 123 switch (Width) { 124 case 8: 125 *(u_int8_t *)Value = val & 0xff; 126 break; 127 case 16: 128 *(u_int16_t *)Value = val & 0xffff; 129 break; 130 case 32: 131 *(u_int32_t *)Value = val; 132 break; 133 default: 134 /* debug trap goes here */ 135 break; 136 } 137 138 139 return(AE_OK); 140 } 141 142 143 ACPI_STATUS 144 AcpiOsWritePciConfiguration ( 145 ACPI_PCI_ID *PciId, 146 UINT32 Register, 147 ACPI_INTEGER Value, 148 UINT32 Width) 149 { 150 u_int32_t byte_width = Width / 8; 151 152 if (!pci_cfgregopen()) 153 return(AE_NOT_EXIST); 154 155 pci_cfgregwrite(PciId->Bus, PciId->Device, PciId->Function, Register, Value, byte_width); 156 157 return(AE_OK); 158 } 159 160 /* XXX should use acpivar.h but too many include dependencies */ 161 extern ACPI_STATUS acpi_EvaluateInteger(ACPI_HANDLE handle, char *path, int 162 *number); 163 164 /* 165 * Depth-first recursive case for finding the bus, given the slot/function. 166 */ 167 static int 168 acpi_bus_number(ACPI_HANDLE root, ACPI_HANDLE curr, ACPI_PCI_ID *PciId) 169 { 170 ACPI_HANDLE parent; 171 ACPI_OBJECT_TYPE type; 172 UINT32 adr; 173 int bus, slot, func, class, subclass, header; 174 175 /* Try to get the _BBN object of the root, otherwise assume it is 0 */ 176 bus = 0; 177 if (root == curr) { 178 if (ACPI_FAILURE(acpi_EvaluateInteger(root, "_BBN", &bus))) 179 printf("acpi_bus_number: root bus has no _BBN, assuming 0\n"); 180 return (bus); 181 } 182 if (ACPI_FAILURE(AcpiGetParent(curr, &parent))) 183 return (bus); 184 185 /* First, recurse up the tree until we find the host bus */ 186 bus = acpi_bus_number(root, parent, PciId); 187 188 /* Validate parent bus device type */ 189 if (ACPI_FAILURE(AcpiGetType(parent, &type)) || type != ACPI_TYPE_DEVICE) { 190 printf("acpi_bus_number: not a device, type %d\n", type); 191 return (bus); 192 } 193 /* Get the parent's slot and function */ 194 if (ACPI_FAILURE(acpi_EvaluateInteger(parent, "_ADR", &adr))) { 195 printf("acpi_bus_number: can't get _ADR\n"); 196 return (bus); 197 } 198 slot = ACPI_HIWORD(adr); 199 func = ACPI_LOWORD(adr); 200 201 /* Is this a PCI-PCI or Cardbus-PCI bridge? */ 202 class = pci_cfgregread(bus, slot, func, PCIR_CLASS, 1); 203 if (class != PCIC_BRIDGE) 204 return (bus); 205 subclass = pci_cfgregread(bus, slot, func, PCIR_SUBCLASS, 1); 206 /* Find the header type, masking off the multifunction bit */ 207 header = pci_cfgregread(bus, slot, func, PCIR_HEADERTYPE, 1) & 0x7f; 208 if (header == 1 && subclass == PCIS_BRIDGE_PCI) 209 bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_1, 1); 210 if (header == 2 && subclass == PCIS_BRIDGE_CARDBUS) 211 bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_2, 1); 212 return (bus); 213 } 214 215 /* 216 * Find the bus number for a device 217 * 218 * rhandle: handle for the root bus 219 * chandle: handle for the device 220 * PciId: pointer to device slot and function, we fill out bus 221 */ 222 void 223 AcpiOsDerivePciId ( 224 ACPI_HANDLE rhandle, 225 ACPI_HANDLE chandle, 226 ACPI_PCI_ID **PciId) 227 { 228 ACPI_HANDLE parent; 229 int bus; 230 231 if (pci_cfgregopen() == 0) 232 panic("AcpiOsDerivePciId unable to initialize pci bus"); 233 234 /* Try to read _BBN for bus number if we're at the root */ 235 bus = 0; 236 if (rhandle == chandle) { 237 if (ACPI_FAILURE(acpi_EvaluateInteger(rhandle, "_BBN", &bus))) 238 printf("AcpiOsDerivePciId: root bus has no _BBN, assuming 0\n"); 239 } 240 /* 241 * Get the parent handle and call the recursive case. It is not 242 * clear why we seem to be getting a chandle that points to a child 243 * of the desired slot/function but passing in the parent handle 244 * here works. 245 */ 246 if (ACPI_SUCCESS(AcpiGetParent(chandle, &parent))) 247 bus = acpi_bus_number(rhandle, parent, *PciId); 248 (*PciId)->Bus = bus; 249 if (bootverbose) { 250 printf("AcpiOsDerivePciId: bus %d dev %d func %d\n", 251 (*PciId)->Bus, (*PciId)->Device, (*PciId)->Function); 252 } 253 } 254