1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2011 Nathan Whitehorn 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/module.h> 34 #include <sys/bus.h> 35 #include <sys/conf.h> 36 #include <sys/kernel.h> 37 #include <sys/rman.h> 38 39 #include <dev/ofw/openfirm.h> 40 #include <dev/ofw/ofw_pci.h> 41 #include <dev/ofw/ofw_bus.h> 42 #include <dev/ofw/ofw_bus_subr.h> 43 #include <dev/ofw/ofwpci.h> 44 45 #include <dev/pci/pcivar.h> 46 #include <dev/pci/pcireg.h> 47 48 #include <machine/bus.h> 49 #include <machine/intr_machdep.h> 50 #include <machine/md_var.h> 51 #include <machine/pio.h> 52 #include <machine/resource.h> 53 #include <machine/rtas.h> 54 55 #include <vm/vm.h> 56 #include <vm/pmap.h> 57 58 #include <powerpc/pseries/plpar_iommu.h> 59 60 #include "pcib_if.h" 61 #include "iommu_if.h" 62 63 /* 64 * Device interface. 65 */ 66 static int rtaspci_probe(device_t); 67 static int rtaspci_attach(device_t); 68 69 /* 70 * pcib interface. 71 */ 72 static u_int32_t rtaspci_read_config(device_t, u_int, u_int, u_int, 73 u_int, int); 74 static void rtaspci_write_config(device_t, u_int, u_int, u_int, 75 u_int, u_int32_t, int); 76 77 /* 78 * Driver methods. 79 */ 80 static device_method_t rtaspci_methods[] = { 81 /* Device interface */ 82 DEVMETHOD(device_probe, rtaspci_probe), 83 DEVMETHOD(device_attach, rtaspci_attach), 84 85 /* pcib interface */ 86 DEVMETHOD(pcib_read_config, rtaspci_read_config), 87 DEVMETHOD(pcib_write_config, rtaspci_write_config), 88 89 DEVMETHOD_END 90 }; 91 92 struct rtaspci_softc { 93 struct ofw_pci_softc pci_sc; 94 95 struct ofw_pci_register sc_pcir; 96 97 cell_t read_pci_config, write_pci_config; 98 cell_t ex_read_pci_config, ex_write_pci_config; 99 int sc_extended_config; 100 }; 101 102 static devclass_t rtaspci_devclass; 103 DEFINE_CLASS_1(pcib, rtaspci_driver, rtaspci_methods, 104 sizeof(struct rtaspci_softc), ofw_pcib_driver); 105 DRIVER_MODULE(rtaspci, ofwbus, rtaspci_driver, rtaspci_devclass, 0, 0); 106 107 static int 108 rtaspci_probe(device_t dev) 109 { 110 const char *type; 111 112 if (!rtas_exists()) 113 return (ENXIO); 114 115 type = ofw_bus_get_type(dev); 116 117 if (OF_getproplen(ofw_bus_get_node(dev), "used-by-rtas") < 0) 118 return (ENXIO); 119 if (type == NULL || strcmp(type, "pci") != 0) 120 return (ENXIO); 121 122 device_set_desc(dev, "RTAS Host-PCI bridge"); 123 return (BUS_PROBE_GENERIC); 124 } 125 126 static int 127 rtaspci_attach(device_t dev) 128 { 129 struct rtaspci_softc *sc; 130 131 sc = device_get_softc(dev); 132 133 if (OF_getencprop(ofw_bus_get_node(dev), "reg", (pcell_t *)&sc->sc_pcir, 134 sizeof(sc->sc_pcir)) == -1) 135 return (ENXIO); 136 137 sc->read_pci_config = rtas_token_lookup("read-pci-config"); 138 sc->write_pci_config = rtas_token_lookup("write-pci-config"); 139 sc->ex_read_pci_config = rtas_token_lookup("ibm,read-pci-config"); 140 sc->ex_write_pci_config = rtas_token_lookup("ibm,write-pci-config"); 141 142 sc->sc_extended_config = 0; 143 OF_getencprop(ofw_bus_get_node(dev), "ibm,pci-config-space-type", 144 &sc->sc_extended_config, sizeof(sc->sc_extended_config)); 145 146 return (ofw_pcib_attach(dev)); 147 } 148 149 static uint32_t 150 rtaspci_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 151 int width) 152 { 153 struct rtaspci_softc *sc; 154 uint32_t retval = 0xffffffff; 155 uint32_t config_addr; 156 int error, pcierror; 157 158 sc = device_get_softc(dev); 159 160 config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) | 161 ((func & 0x7) << 8) | (reg & 0xff); 162 if (sc->sc_extended_config) 163 config_addr |= (reg & 0xf00) << 16; 164 165 if (sc->ex_read_pci_config != -1) 166 error = rtas_call_method(sc->ex_read_pci_config, 4, 2, 167 config_addr, sc->sc_pcir.phys_hi, 168 sc->sc_pcir.phys_mid, width, &pcierror, &retval); 169 else 170 error = rtas_call_method(sc->read_pci_config, 2, 2, 171 config_addr, width, &pcierror, &retval); 172 173 /* Sign-extend output */ 174 switch (width) { 175 case 1: 176 retval = (int32_t)(int8_t)(retval); 177 break; 178 case 2: 179 retval = (int32_t)(int16_t)(retval); 180 break; 181 } 182 183 if (error < 0 || pcierror != 0) 184 retval = 0xffffffff; 185 186 return (retval); 187 } 188 189 static void 190 rtaspci_write_config(device_t dev, u_int bus, u_int slot, u_int func, 191 u_int reg, uint32_t val, int width) 192 { 193 struct rtaspci_softc *sc; 194 uint32_t config_addr; 195 int pcierror; 196 197 sc = device_get_softc(dev); 198 199 config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) | 200 ((func & 0x7) << 8) | (reg & 0xff); 201 if (sc->sc_extended_config) 202 config_addr |= (reg & 0xf00) << 16; 203 204 if (sc->ex_write_pci_config != -1) 205 rtas_call_method(sc->ex_write_pci_config, 5, 1, config_addr, 206 sc->sc_pcir.phys_hi, sc->sc_pcir.phys_mid, 207 width, val, &pcierror); 208 else 209 rtas_call_method(sc->write_pci_config, 3, 1, config_addr, 210 width, val, &pcierror); 211 } 212