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 #ifdef __amd64__ 61 #define ACPI_BUS_SPACE_IO AMD64_BUS_SPACE_IO 62 #define ACPI_BUS_HANDLE 0 63 #endif 64 65 ACPI_STATUS 66 AcpiOsReadPort(ACPI_IO_ADDRESS InPort, UINT32 *Value, UINT32 Width) 67 { 68 switch (Width) { 69 case 8: 70 *(u_int8_t *)Value = bus_space_read_1(ACPI_BUS_SPACE_IO, 71 ACPI_BUS_HANDLE, InPort); 72 break; 73 case 16: 74 *(u_int16_t *)Value = bus_space_read_2(ACPI_BUS_SPACE_IO, 75 ACPI_BUS_HANDLE, InPort); 76 break; 77 case 32: 78 *(u_int32_t *)Value = bus_space_read_4(ACPI_BUS_SPACE_IO, 79 ACPI_BUS_HANDLE, InPort); 80 break; 81 default: 82 /* debug trap goes here */ 83 break; 84 } 85 86 return (AE_OK); 87 } 88 89 ACPI_STATUS 90 AcpiOsWritePort(ACPI_IO_ADDRESS OutPort, UINT32 Value, UINT32 Width) 91 { 92 switch (Width) { 93 case 8: 94 bus_space_write_1(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 95 break; 96 case 16: 97 bus_space_write_2(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 98 break; 99 case 32: 100 bus_space_write_4(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 101 break; 102 default: 103 /* debug trap goes here */ 104 break; 105 } 106 107 return (AE_OK); 108 } 109 110 ACPI_STATUS 111 AcpiOsReadPciConfiguration(ACPI_PCI_ID *PciId, UINT32 Register, void *Value, 112 UINT32 Width) 113 { 114 u_int32_t byte_width = Width / 8; 115 u_int32_t val; 116 117 if (!pci_cfgregopen()) 118 return (AE_NOT_EXIST); 119 120 val = pci_cfgregread(PciId->Bus, PciId->Device, PciId->Function, Register, 121 byte_width); 122 switch (Width) { 123 case 8: 124 *(u_int8_t *)Value = val & 0xff; 125 break; 126 case 16: 127 *(u_int16_t *)Value = val & 0xffff; 128 break; 129 case 32: 130 *(u_int32_t *)Value = val; 131 break; 132 default: 133 /* debug trap goes here */ 134 break; 135 } 136 137 return (AE_OK); 138 } 139 140 141 ACPI_STATUS 142 AcpiOsWritePciConfiguration (ACPI_PCI_ID *PciId, UINT32 Register, 143 ACPI_INTEGER Value, UINT32 Width) 144 { 145 u_int32_t byte_width = Width / 8; 146 147 if (!pci_cfgregopen()) 148 return (AE_NOT_EXIST); 149 150 pci_cfgregwrite(PciId->Bus, PciId->Device, PciId->Function, Register, 151 Value, byte_width); 152 153 return (AE_OK); 154 } 155 156 /* XXX should use acpivar.h but too many include dependencies */ 157 extern ACPI_STATUS acpi_GetInteger(ACPI_HANDLE handle, char *path, int 158 *number); 159 160 /* 161 * Depth-first recursive case for finding the bus, given the slot/function. 162 */ 163 static int 164 acpi_bus_number(ACPI_HANDLE root, ACPI_HANDLE curr, ACPI_PCI_ID *PciId) 165 { 166 ACPI_HANDLE parent; 167 ACPI_STATUS status; 168 ACPI_OBJECT_TYPE type; 169 UINT32 adr; 170 int bus, slot, func, class, subclass, header; 171 172 /* Try to get the _BBN object of the root, otherwise assume it is 0. */ 173 bus = 0; 174 if (root == curr) { 175 status = acpi_GetInteger(root, "_BBN", &bus); 176 if (ACPI_FAILURE(status) && bootverbose) 177 printf("acpi_bus_number: root bus has no _BBN, assuming 0\n"); 178 return (bus); 179 } 180 status = AcpiGetParent(curr, &parent); 181 if (ACPI_FAILURE(status)) 182 return (bus); 183 184 /* First, recurse up the tree until we find the host bus. */ 185 bus = acpi_bus_number(root, parent, PciId); 186 187 /* Validate parent bus device type. */ 188 if (ACPI_FAILURE(AcpiGetType(parent, &type)) || type != ACPI_TYPE_DEVICE) { 189 printf("acpi_bus_number: not a device, type %d\n", type); 190 return (bus); 191 } 192 193 /* Get the parent's slot and function. */ 194 status = acpi_GetInteger(parent, "_ADR", &adr); 195 if (ACPI_FAILURE(status)) { 196 printf("acpi_bus_number: can't get _ADR\n"); 197 return (bus); 198 } 199 slot = ACPI_HIWORD(adr); 200 func = ACPI_LOWORD(adr); 201 202 /* Is this a PCI-PCI or Cardbus-PCI bridge? */ 203 class = pci_cfgregread(bus, slot, func, PCIR_CLASS, 1); 204 if (class != PCIC_BRIDGE) 205 return (bus); 206 subclass = pci_cfgregread(bus, slot, func, PCIR_SUBCLASS, 1); 207 208 /* Find the header type, masking off the multifunction bit. */ 209 header = pci_cfgregread(bus, slot, func, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE; 210 if (header == PCIM_HDRTYPE_BRIDGE && subclass == PCIS_BRIDGE_PCI) 211 bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_1, 1); 212 if (header == PCIM_HDRTYPE_CARDBUS && subclass == PCIS_BRIDGE_CARDBUS) 213 bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_2, 1); 214 return (bus); 215 } 216 217 /* 218 * Find the bus number for a device 219 * 220 * rhandle: handle for the root bus 221 * chandle: handle for the device 222 * PciId: pointer to device slot and function, we fill out bus 223 */ 224 void 225 AcpiOsDerivePciId(ACPI_HANDLE rhandle, ACPI_HANDLE chandle, ACPI_PCI_ID **PciId) 226 { 227 ACPI_HANDLE parent; 228 ACPI_STATUS status; 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 status = acpi_GetInteger(rhandle, "_BBN", &bus); 238 if (ACPI_FAILURE(status) && bootverbose) 239 printf("AcpiOsDerivePciId: root bus has no _BBN, assuming 0\n"); 240 } 241 242 /* 243 * Get the parent handle and call the recursive case. It is not 244 * clear why we seem to be getting a chandle that points to a child 245 * of the desired slot/function but passing in the parent handle 246 * here works. 247 */ 248 if (ACPI_SUCCESS(AcpiGetParent(chandle, &parent))) 249 bus = acpi_bus_number(rhandle, parent, *PciId); 250 (*PciId)->Bus = bus; 251 if (bootverbose) { 252 printf("AcpiOsDerivePciId: bus %d dev %d func %d\n", 253 (*PciId)->Bus, (*PciId)->Device, (*PciId)->Function); 254 } 255 } 256