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/include/acpi.h> 36 37 #include <sys/bus.h> 38 #include <sys/kernel.h> 39 #include <machine/bus.h> 40 #include <machine/pci_cfgreg.h> 41 #include <dev/acpica/acpivar.h> 42 #include <dev/pci/pcireg.h> 43 44 /* 45 * ACPICA's rather gung-ho approach to hardware resource ownership is a little 46 * troublesome insofar as there is no easy way for us to know in advance 47 * exactly which I/O resources it's going to want to use. 48 * 49 * In order to deal with this, we ignore resource ownership entirely, and simply 50 * use the native I/O space accessor functionality. This is Evil, but it works. 51 * 52 * XXX use an intermediate #define for the tag/handle 53 */ 54 55 #ifdef __i386__ 56 #define ACPI_BUS_SPACE_IO I386_BUS_SPACE_IO 57 #define ACPI_BUS_HANDLE 0 58 #endif 59 #ifdef __ia64__ 60 #define ACPI_BUS_SPACE_IO IA64_BUS_SPACE_IO 61 #define ACPI_BUS_HANDLE 0 62 #endif 63 #ifdef __amd64__ 64 #define ACPI_BUS_SPACE_IO AMD64_BUS_SPACE_IO 65 #define ACPI_BUS_HANDLE 0 66 #endif 67 68 ACPI_STATUS 69 AcpiOsReadPort(ACPI_IO_ADDRESS InPort, UINT32 *Value, UINT32 Width) 70 { 71 72 switch (Width) { 73 case 8: 74 *(u_int8_t *)Value = bus_space_read_1(ACPI_BUS_SPACE_IO, 75 ACPI_BUS_HANDLE, InPort); 76 break; 77 case 16: 78 *(u_int16_t *)Value = bus_space_read_2(ACPI_BUS_SPACE_IO, 79 ACPI_BUS_HANDLE, InPort); 80 break; 81 case 32: 82 *(u_int32_t *)Value = bus_space_read_4(ACPI_BUS_SPACE_IO, 83 ACPI_BUS_HANDLE, InPort); 84 break; 85 default: 86 /* debug trap goes here */ 87 break; 88 } 89 90 return (AE_OK); 91 } 92 93 ACPI_STATUS 94 AcpiOsWritePort(ACPI_IO_ADDRESS OutPort, UINT32 Value, UINT32 Width) 95 { 96 97 switch (Width) { 98 case 8: 99 bus_space_write_1(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 100 break; 101 case 16: 102 bus_space_write_2(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 103 break; 104 case 32: 105 bus_space_write_4(ACPI_BUS_SPACE_IO, ACPI_BUS_HANDLE, OutPort, Value); 106 break; 107 default: 108 /* debug trap goes here */ 109 break; 110 } 111 112 return (AE_OK); 113 } 114 115 ACPI_STATUS 116 AcpiOsReadPciConfiguration(ACPI_PCI_ID *PciId, UINT32 Register, void *Value, 117 UINT32 Width) 118 { 119 u_int32_t byte_width = Width / 8; 120 u_int32_t val; 121 122 if (!pci_cfgregopen()) 123 return (AE_NOT_EXIST); 124 125 val = pci_cfgregread(PciId->Bus, PciId->Device, PciId->Function, Register, 126 byte_width); 127 switch (Width) { 128 case 8: 129 *(u_int8_t *)Value = val & 0xff; 130 break; 131 case 16: 132 *(u_int16_t *)Value = val & 0xffff; 133 break; 134 case 32: 135 *(u_int32_t *)Value = val; 136 break; 137 default: 138 /* debug trap goes here */ 139 break; 140 } 141 142 return (AE_OK); 143 } 144 145 146 ACPI_STATUS 147 AcpiOsWritePciConfiguration (ACPI_PCI_ID *PciId, UINT32 Register, 148 UINT64 Value, 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, 156 Value, byte_width); 157 158 return (AE_OK); 159 } 160 161 /* 162 * Depth-first recursive case for finding the bus, given the slot/function. 163 */ 164 static int 165 acpi_bus_number(ACPI_HANDLE root, ACPI_HANDLE curr, ACPI_PCI_ID *PciId) 166 { 167 ACPI_HANDLE parent; 168 ACPI_STATUS status; 169 ACPI_OBJECT_TYPE type; 170 UINT32 adr; 171 int bus, slot, func, class, subclass, header; 172 173 /* Try to get the _BBN object of the root, otherwise assume it is 0. */ 174 bus = 0; 175 if (root == curr) { 176 status = acpi_GetInteger(root, "_BBN", &bus); 177 if (ACPI_FAILURE(status) && bootverbose) 178 printf("acpi_bus_number: root bus has no _BBN, assuming 0\n"); 179 return (bus); 180 } 181 status = AcpiGetParent(curr, &parent); 182 if (ACPI_FAILURE(status)) 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 } 193 194 /* Get the parent's slot and function. */ 195 status = acpi_GetInteger(parent, "_ADR", &adr); 196 if (ACPI_FAILURE(status)) 197 return (bus); 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); 206 207 /* Find the header type, masking off the multifunction bit. */ 208 header = pci_cfgregread(bus, slot, func, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE; 209 if (header == PCIM_HDRTYPE_BRIDGE && subclass == PCIS_BRIDGE_PCI) 210 bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_1, 1); 211 else if (header == PCIM_HDRTYPE_CARDBUS && subclass == PCIS_BRIDGE_CARDBUS) 212 bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_2, 1); 213 return (bus); 214 } 215 216 /* 217 * Find the bus number for a device 218 * 219 * Device: handle for the PCI root bridge device 220 * Region: handle for the PCI configuration space operation region 221 * PciId: pointer to device slot and function, we fill out bus 222 */ 223 void 224 AcpiOsDerivePciId(ACPI_HANDLE Device, ACPI_HANDLE Region, ACPI_PCI_ID **PciId) 225 { 226 ACPI_HANDLE parent; 227 ACPI_STATUS status; 228 int bus; 229 230 if (pci_cfgregopen() == 0) 231 panic("AcpiOsDerivePciId unable to initialize pci bus"); 232 233 /* Try to read _BBN for bus number if we're at the root. */ 234 bus = 0; 235 if (Device == Region) { 236 status = acpi_GetInteger(Device, "_BBN", &bus); 237 if (ACPI_FAILURE(status) && bootverbose) 238 printf("AcpiOsDerivePciId: root bus has no _BBN, assuming 0\n"); 239 } 240 241 /* Get the parent handle and call the recursive case. */ 242 if (ACPI_SUCCESS(AcpiGetParent(Region, &parent))) 243 bus = acpi_bus_number(Device, parent, *PciId); 244 (*PciId)->Bus = bus; 245 if (bootverbose) { 246 printf("AcpiOsDerivePciId: %s -> bus %d dev %d func %d\n", 247 acpi_name(Region), (*PciId)->Bus, (*PciId)->Device, 248 (*PciId)->Function); 249 } 250 } 251