1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 30 #include <sys/systm.h> 31 #include <sys/module.h> 32 #include <sys/bus.h> 33 #include <sys/conf.h> 34 #include <sys/kernel.h> 35 #include <sys/rman.h> 36 37 #include <dev/ofw/openfirm.h> 38 #include <dev/ofw/ofw_pci.h> 39 #include <dev/ofw/ofw_bus.h> 40 #include <dev/ofw/ofw_bus_subr.h> 41 #include <dev/ofw/ofwpci.h> 42 43 #include <dev/pci/pcivar.h> 44 #include <dev/pci/pcireg.h> 45 46 #include <machine/bus.h> 47 #include <machine/intr_machdep.h> 48 #include <machine/md_var.h> 49 #include <machine/pio.h> 50 #include <machine/resource.h> 51 #include <machine/rtas.h> 52 53 #include <vm/vm.h> 54 #include <vm/pmap.h> 55 56 #include <powerpc/pseries/plpar_iommu.h> 57 58 #include "pcib_if.h" 59 #include "iommu_if.h" 60 61 /* 62 * Device interface. 63 */ 64 static int rtaspci_probe(device_t); 65 static int rtaspci_attach(device_t); 66 67 /* 68 * pcib interface. 69 */ 70 static u_int32_t rtaspci_read_config(device_t, u_int, u_int, u_int, 71 u_int, int); 72 static void rtaspci_write_config(device_t, u_int, u_int, u_int, 73 u_int, u_int32_t, int); 74 75 /* 76 * Driver methods. 77 */ 78 static device_method_t rtaspci_methods[] = { 79 /* Device interface */ 80 DEVMETHOD(device_probe, rtaspci_probe), 81 DEVMETHOD(device_attach, rtaspci_attach), 82 83 /* pcib interface */ 84 DEVMETHOD(pcib_read_config, rtaspci_read_config), 85 DEVMETHOD(pcib_write_config, rtaspci_write_config), 86 87 DEVMETHOD_END 88 }; 89 90 struct rtaspci_softc { 91 struct ofw_pci_softc pci_sc; 92 93 struct ofw_pci_register sc_pcir; 94 95 cell_t read_pci_config, write_pci_config; 96 cell_t ex_read_pci_config, ex_write_pci_config; 97 int sc_extended_config; 98 }; 99 100 DEFINE_CLASS_1(pcib, rtaspci_driver, rtaspci_methods, 101 sizeof(struct rtaspci_softc), ofw_pcib_driver); 102 DRIVER_MODULE(rtaspci, ofwbus, rtaspci_driver, 0, 0); 103 104 static int 105 rtaspci_probe(device_t dev) 106 { 107 const char *type; 108 109 if (!rtas_exists()) 110 return (ENXIO); 111 112 type = ofw_bus_get_type(dev); 113 114 if (OF_getproplen(ofw_bus_get_node(dev), "used-by-rtas") < 0) 115 return (ENXIO); 116 if (type == NULL || strcmp(type, "pci") != 0) 117 return (ENXIO); 118 119 device_set_desc(dev, "RTAS Host-PCI bridge"); 120 return (BUS_PROBE_GENERIC); 121 } 122 123 static int 124 rtaspci_attach(device_t dev) 125 { 126 struct rtaspci_softc *sc; 127 128 sc = device_get_softc(dev); 129 130 if (OF_getencprop(ofw_bus_get_node(dev), "reg", (pcell_t *)&sc->sc_pcir, 131 sizeof(sc->sc_pcir)) == -1) 132 return (ENXIO); 133 134 sc->read_pci_config = rtas_token_lookup("read-pci-config"); 135 sc->write_pci_config = rtas_token_lookup("write-pci-config"); 136 sc->ex_read_pci_config = rtas_token_lookup("ibm,read-pci-config"); 137 sc->ex_write_pci_config = rtas_token_lookup("ibm,write-pci-config"); 138 139 sc->sc_extended_config = 0; 140 OF_getencprop(ofw_bus_get_node(dev), "ibm,pci-config-space-type", 141 &sc->sc_extended_config, sizeof(sc->sc_extended_config)); 142 143 return (ofw_pcib_attach(dev)); 144 } 145 146 static uint32_t 147 rtaspci_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 148 int width) 149 { 150 struct rtaspci_softc *sc; 151 uint32_t retval = 0xffffffff; 152 uint32_t config_addr; 153 int error, pcierror; 154 155 sc = device_get_softc(dev); 156 157 config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) | 158 ((func & 0x7) << 8) | (reg & 0xff); 159 if (sc->sc_extended_config) 160 config_addr |= (reg & 0xf00) << 16; 161 162 if (sc->ex_read_pci_config != -1) 163 error = rtas_call_method(sc->ex_read_pci_config, 4, 2, 164 config_addr, sc->sc_pcir.phys_hi, 165 sc->sc_pcir.phys_mid, width, &pcierror, &retval); 166 else 167 error = rtas_call_method(sc->read_pci_config, 2, 2, 168 config_addr, width, &pcierror, &retval); 169 170 /* Sign-extend output */ 171 switch (width) { 172 case 1: 173 retval = (int32_t)(int8_t)(retval); 174 break; 175 case 2: 176 retval = (int32_t)(int16_t)(retval); 177 break; 178 } 179 180 if (error < 0 || pcierror != 0) 181 retval = 0xffffffff; 182 183 return (retval); 184 } 185 186 static void 187 rtaspci_write_config(device_t dev, u_int bus, u_int slot, u_int func, 188 u_int reg, uint32_t val, int width) 189 { 190 struct rtaspci_softc *sc; 191 uint32_t config_addr; 192 int pcierror; 193 194 sc = device_get_softc(dev); 195 196 config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) | 197 ((func & 0x7) << 8) | (reg & 0xff); 198 if (sc->sc_extended_config) 199 config_addr |= (reg & 0xf00) << 16; 200 201 if (sc->ex_write_pci_config != -1) 202 rtas_call_method(sc->ex_write_pci_config, 5, 1, config_addr, 203 sc->sc_pcir.phys_hi, sc->sc_pcir.phys_mid, 204 width, val, &pcierror); 205 else 206 rtas_call_method(sc->write_pci_config, 3, 1, config_addr, 207 width, val, &pcierror); 208 } 209