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 struct ofw_pci_register sc_pcir; 95 96 cell_t read_pci_config, write_pci_config; 97 cell_t ex_read_pci_config, ex_write_pci_config; 98 int sc_extended_config; 99 }; 100 101 static devclass_t rtaspci_devclass; 102 DEFINE_CLASS_1(pcib, rtaspci_driver, rtaspci_methods, 103 sizeof(struct rtaspci_softc), ofw_pci_driver); 104 DRIVER_MODULE(rtaspci, ofwbus, rtaspci_driver, rtaspci_devclass, 0, 0); 105 106 static int 107 rtaspci_probe(device_t dev) 108 { 109 const char *type; 110 111 if (!rtas_exists()) 112 return (ENXIO); 113 114 type = ofw_bus_get_type(dev); 115 116 if (OF_getproplen(ofw_bus_get_node(dev), "used-by-rtas") < 0) 117 return (ENXIO); 118 if (type == NULL || strcmp(type, "pci") != 0) 119 return (ENXIO); 120 121 device_set_desc(dev, "RTAS Host-PCI bridge"); 122 return (BUS_PROBE_GENERIC); 123 } 124 125 static int 126 rtaspci_attach(device_t dev) 127 { 128 struct rtaspci_softc *sc; 129 130 sc = device_get_softc(dev); 131 132 if (OF_getencprop(ofw_bus_get_node(dev), "reg", (pcell_t *)&sc->sc_pcir, 133 sizeof(sc->sc_pcir)) == -1) 134 return (ENXIO); 135 136 sc->read_pci_config = rtas_token_lookup("read-pci-config"); 137 sc->write_pci_config = rtas_token_lookup("write-pci-config"); 138 sc->ex_read_pci_config = rtas_token_lookup("ibm,read-pci-config"); 139 sc->ex_write_pci_config = rtas_token_lookup("ibm,write-pci-config"); 140 141 sc->sc_extended_config = 0; 142 OF_getencprop(ofw_bus_get_node(dev), "ibm,pci-config-space-type", 143 &sc->sc_extended_config, sizeof(sc->sc_extended_config)); 144 145 return (ofw_pci_attach(dev)); 146 } 147 148 static uint32_t 149 rtaspci_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 150 int width) 151 { 152 struct rtaspci_softc *sc; 153 uint32_t retval = 0xffffffff; 154 uint32_t config_addr; 155 int error, pcierror; 156 157 sc = device_get_softc(dev); 158 159 config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) | 160 ((func & 0x7) << 8) | (reg & 0xff); 161 if (sc->sc_extended_config) 162 config_addr |= (reg & 0xf00) << 16; 163 164 if (sc->ex_read_pci_config != -1) 165 error = rtas_call_method(sc->ex_read_pci_config, 4, 2, 166 config_addr, sc->sc_pcir.phys_hi, 167 sc->sc_pcir.phys_mid, width, &pcierror, &retval); 168 else 169 error = rtas_call_method(sc->read_pci_config, 2, 2, 170 config_addr, width, &pcierror, &retval); 171 172 /* Sign-extend output */ 173 switch (width) { 174 case 1: 175 retval = (int32_t)(int8_t)(retval); 176 break; 177 case 2: 178 retval = (int32_t)(int16_t)(retval); 179 break; 180 } 181 182 if (error < 0 || pcierror != 0) 183 retval = 0xffffffff; 184 185 return (retval); 186 } 187 188 static void 189 rtaspci_write_config(device_t dev, u_int bus, u_int slot, u_int func, 190 u_int reg, uint32_t val, int width) 191 { 192 struct rtaspci_softc *sc; 193 uint32_t config_addr; 194 int pcierror; 195 196 sc = device_get_softc(dev); 197 198 config_addr = ((bus & 0xff) << 16) | ((slot & 0x1f) << 11) | 199 ((func & 0x7) << 8) | (reg & 0xff); 200 if (sc->sc_extended_config) 201 config_addr |= (reg & 0xf00) << 16; 202 203 if (sc->ex_write_pci_config != -1) 204 rtas_call_method(sc->ex_write_pci_config, 5, 1, config_addr, 205 sc->sc_pcir.phys_hi, sc->sc_pcir.phys_mid, 206 width, val, &pcierror); 207 else 208 rtas_call_method(sc->write_pci_config, 3, 1, config_addr, 209 width, val, &pcierror); 210 } 211 212