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