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/iodev.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 53 ACPI_STATUS 54 AcpiOsReadPort(ACPI_IO_ADDRESS InPort, UINT32 *Value, UINT32 Width) 55 { 56 57 switch (Width) { 58 case 8: 59 *Value = iodev_read_1(InPort); 60 break; 61 case 16: 62 *Value = iodev_read_2(InPort); 63 break; 64 case 32: 65 *Value = iodev_read_4(InPort); 66 break; 67 } 68 69 return (AE_OK); 70 } 71 72 ACPI_STATUS 73 AcpiOsWritePort(ACPI_IO_ADDRESS OutPort, UINT32 Value, UINT32 Width) 74 { 75 76 switch (Width) { 77 case 8: 78 iodev_write_1(OutPort, Value); 79 break; 80 case 16: 81 iodev_write_2(OutPort, Value); 82 break; 83 case 32: 84 iodev_write_4(OutPort, Value); 85 break; 86 } 87 88 return (AE_OK); 89 } 90 91 ACPI_STATUS 92 AcpiOsReadPciConfiguration(ACPI_PCI_ID *PciId, UINT32 Register, UINT64 *Value, 93 UINT32 Width) 94 { 95 96 if (Width == 64) 97 return (AE_SUPPORT); 98 99 if (!pci_cfgregopen()) 100 return (AE_NOT_EXIST); 101 102 *(UINT64 *)Value = pci_cfgregread(PciId->Bus, PciId->Device, 103 PciId->Function, Register, Width / 8); 104 105 return (AE_OK); 106 } 107 108 109 ACPI_STATUS 110 AcpiOsWritePciConfiguration (ACPI_PCI_ID *PciId, UINT32 Register, 111 UINT64 Value, UINT32 Width) 112 { 113 114 if (Width == 64) 115 return (AE_SUPPORT); 116 117 if (!pci_cfgregopen()) 118 return (AE_NOT_EXIST); 119 120 pci_cfgregwrite(PciId->Bus, PciId->Device, PciId->Function, Register, 121 Value, Width / 8); 122 123 return (AE_OK); 124 } 125 126 /* 127 * Depth-first recursive case for finding the bus, given the slot/function. 128 */ 129 static int 130 acpi_bus_number(ACPI_HANDLE root, ACPI_HANDLE curr, ACPI_PCI_ID *PciId) 131 { 132 ACPI_HANDLE parent; 133 ACPI_STATUS status; 134 ACPI_OBJECT_TYPE type; 135 UINT32 adr; 136 int bus, slot, func, class, subclass, header; 137 138 /* Try to get the _BBN object of the root, otherwise assume it is 0. */ 139 bus = 0; 140 if (root == curr) { 141 status = acpi_GetInteger(root, "_BBN", &bus); 142 if (ACPI_FAILURE(status) && bootverbose) 143 printf("acpi_bus_number: root bus has no _BBN, assuming 0\n"); 144 return (bus); 145 } 146 status = AcpiGetParent(curr, &parent); 147 if (ACPI_FAILURE(status)) 148 return (bus); 149 150 /* First, recurse up the tree until we find the host bus. */ 151 bus = acpi_bus_number(root, parent, PciId); 152 153 /* Validate parent bus device type. */ 154 if (ACPI_FAILURE(AcpiGetType(parent, &type)) || type != ACPI_TYPE_DEVICE) { 155 printf("acpi_bus_number: not a device, type %d\n", type); 156 return (bus); 157 } 158 159 /* Get the parent's slot and function. */ 160 status = acpi_GetInteger(parent, "_ADR", &adr); 161 if (ACPI_FAILURE(status)) 162 return (bus); 163 slot = ACPI_HIWORD(adr); 164 func = ACPI_LOWORD(adr); 165 166 /* Is this a PCI-PCI or Cardbus-PCI bridge? */ 167 class = pci_cfgregread(bus, slot, func, PCIR_CLASS, 1); 168 if (class != PCIC_BRIDGE) 169 return (bus); 170 subclass = pci_cfgregread(bus, slot, func, PCIR_SUBCLASS, 1); 171 172 /* Find the header type, masking off the multifunction bit. */ 173 header = pci_cfgregread(bus, slot, func, PCIR_HDRTYPE, 1) & PCIM_HDRTYPE; 174 if (header == PCIM_HDRTYPE_BRIDGE && subclass == PCIS_BRIDGE_PCI) 175 bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_1, 1); 176 else if (header == PCIM_HDRTYPE_CARDBUS && subclass == PCIS_BRIDGE_CARDBUS) 177 bus = pci_cfgregread(bus, slot, func, PCIR_SECBUS_2, 1); 178 return (bus); 179 } 180 181 /* 182 * Find the bus number for a device 183 * 184 * Device: handle for the PCI root bridge device 185 * Region: handle for the PCI configuration space operation region 186 * PciId: pointer to device slot and function, we fill out bus 187 */ 188 void 189 AcpiOsDerivePciId(ACPI_HANDLE Device, ACPI_HANDLE Region, ACPI_PCI_ID **PciId) 190 { 191 ACPI_HANDLE parent; 192 ACPI_STATUS status; 193 int bus; 194 195 if (pci_cfgregopen() == 0) 196 panic("AcpiOsDerivePciId unable to initialize pci bus"); 197 198 /* Try to read _BBN for bus number if we're at the root. */ 199 bus = 0; 200 if (Device == Region) { 201 status = acpi_GetInteger(Device, "_BBN", &bus); 202 if (ACPI_FAILURE(status) && bootverbose) 203 printf("AcpiOsDerivePciId: root bus has no _BBN, assuming 0\n"); 204 } 205 206 /* Get the parent handle and call the recursive case. */ 207 if (ACPI_SUCCESS(AcpiGetParent(Region, &parent))) 208 bus = acpi_bus_number(Device, parent, *PciId); 209 (*PciId)->Bus = bus; 210 if (bootverbose) { 211 printf("AcpiOsDerivePciId: %s -> bus %d dev %d func %d\n", 212 acpi_name(Region), (*PciId)->Bus, (*PciId)->Device, 213 (*PciId)->Function); 214 } 215 } 216