1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright 2003 by Peter Grehan. 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 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 22 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 24 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 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/proc.h> 38 #include <sys/rman.h> 39 40 #include <dev/ofw/openfirm.h> 41 #include <dev/ofw/ofw_pci.h> 42 #include <dev/ofw/ofw_bus.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 #include <dev/ofw/ofwpci.h> 45 46 #include <dev/pci/pcivar.h> 47 #include <dev/pci/pcireg.h> 48 49 #include <machine/bus.h> 50 #include <machine/intr_machdep.h> 51 #include <machine/md_var.h> 52 #include <machine/pio.h> 53 #include <machine/resource.h> 54 55 #include <powerpc/powermac/gracklevar.h> 56 57 #include <vm/vm.h> 58 #include <vm/pmap.h> 59 60 #include "pcib_if.h" 61 62 /* 63 * Device interface. 64 */ 65 static int grackle_probe(device_t); 66 static int grackle_attach(device_t); 67 68 /* 69 * pcib interface. 70 */ 71 static u_int32_t grackle_read_config(device_t, u_int, u_int, u_int, 72 u_int, int); 73 static void grackle_write_config(device_t, u_int, u_int, u_int, 74 u_int, u_int32_t, int); 75 76 /* 77 * Local routines. 78 */ 79 static int grackle_enable_config(struct grackle_softc *, u_int, 80 u_int, u_int, u_int); 81 static void grackle_disable_config(struct grackle_softc *); 82 static int badaddr(void *, size_t); 83 84 /* 85 * Driver methods. 86 */ 87 static device_method_t grackle_methods[] = { 88 /* Device interface */ 89 DEVMETHOD(device_probe, grackle_probe), 90 DEVMETHOD(device_attach, grackle_attach), 91 92 /* pcib interface */ 93 DEVMETHOD(pcib_read_config, grackle_read_config), 94 DEVMETHOD(pcib_write_config, grackle_write_config), 95 96 DEVMETHOD_END 97 }; 98 99 DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods, 100 sizeof(struct grackle_softc), ofw_pcib_driver); 101 DRIVER_MODULE(grackle, ofwbus, grackle_driver, 0, 0); 102 103 static int 104 grackle_probe(device_t dev) 105 { 106 const char *type, *compatible; 107 108 type = ofw_bus_get_type(dev); 109 compatible = ofw_bus_get_compat(dev); 110 111 if (type == NULL || compatible == NULL) 112 return (ENXIO); 113 114 if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0) 115 return (ENXIO); 116 117 device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge"); 118 return (0); 119 } 120 121 static int 122 grackle_attach(device_t dev) 123 { 124 struct grackle_softc *sc; 125 126 sc = device_get_softc(dev); 127 128 /* 129 * The Grackle PCI config addr/data registers are actually in 130 * PCI space, but since they are needed to actually probe the 131 * PCI bus, use the fact that they are also available directly 132 * on the processor bus and map them 133 */ 134 sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE); 135 sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE); 136 137 return (ofw_pcib_attach(dev)); 138 } 139 140 static u_int32_t 141 grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 142 int width) 143 { 144 struct grackle_softc *sc; 145 vm_offset_t caoff; 146 u_int32_t retval = 0xffffffff; 147 148 sc = device_get_softc(dev); 149 caoff = sc->sc_data + (reg & 0x03); 150 151 if (grackle_enable_config(sc, bus, slot, func, reg) != 0) { 152 /* 153 * Config probes to non-existent devices on the 154 * secondary bus generates machine checks. Be sure 155 * to catch these. 156 */ 157 if (bus > 0) { 158 if (badaddr((void *)sc->sc_data, 4)) { 159 return (retval); 160 } 161 } 162 163 switch (width) { 164 case 1: 165 retval = (in8rb(caoff)); 166 break; 167 case 2: 168 retval = (in16rb(caoff)); 169 break; 170 case 4: 171 retval = (in32rb(caoff)); 172 break; 173 } 174 } 175 grackle_disable_config(sc); 176 177 return (retval); 178 } 179 180 static void 181 grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func, 182 u_int reg, u_int32_t val, int width) 183 { 184 struct grackle_softc *sc; 185 vm_offset_t caoff; 186 187 sc = device_get_softc(dev); 188 caoff = sc->sc_data + (reg & 0x03); 189 190 if (grackle_enable_config(sc, bus, slot, func, reg)) { 191 switch (width) { 192 case 1: 193 out8rb(caoff, val); 194 (void)in8rb(caoff); 195 break; 196 case 2: 197 out16rb(caoff, val); 198 (void)in16rb(caoff); 199 break; 200 case 4: 201 out32rb(caoff, val); 202 (void)in32rb(caoff); 203 break; 204 } 205 } 206 grackle_disable_config(sc); 207 } 208 209 static int 210 grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot, 211 u_int func, u_int reg) 212 { 213 u_int32_t cfgval; 214 215 /* 216 * Unlike UniNorth, the format of the config word is the same 217 * for local (0) and remote busses. 218 */ 219 cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC) 220 | GRACKLE_CFG_ENABLE; 221 222 out32rb(sc->sc_addr, cfgval); 223 (void) in32rb(sc->sc_addr); 224 225 return (1); 226 } 227 228 static void 229 grackle_disable_config(struct grackle_softc *sc) 230 { 231 /* 232 * Clear the GRACKLE_CFG_ENABLE bit to prevent stray 233 * accesses from causing config cycles 234 */ 235 out32rb(sc->sc_addr, 0); 236 } 237 238 static int 239 badaddr(void *addr, size_t size) 240 { 241 struct thread *td; 242 jmp_buf env, *oldfaultbuf; 243 244 /* Get rid of any stale machine checks that have been waiting. */ 245 __asm __volatile ("sync; isync"); 246 247 td = curthread; 248 249 oldfaultbuf = td->td_pcb->pcb_onfault; 250 td->td_pcb->pcb_onfault = &env; 251 if (setjmp(env)) { 252 td->td_pcb->pcb_onfault = oldfaultbuf; 253 __asm __volatile ("sync"); 254 return 1; 255 } 256 257 __asm __volatile ("sync"); 258 259 switch (size) { 260 case 1: 261 (void)*(volatile int8_t *)addr; 262 break; 263 case 2: 264 (void)*(volatile int16_t *)addr; 265 break; 266 case 4: 267 (void)*(volatile int32_t *)addr; 268 break; 269 default: 270 panic("badaddr: invalid size (%zd)", size); 271 } 272 273 /* Make sure we took the machine check, if we caused one. */ 274 __asm __volatile ("sync; isync"); 275 276 td->td_pcb->pcb_onfault = oldfaultbuf; 277 __asm __volatile ("sync"); /* To be sure. */ 278 279 return (0); 280 } 281 282 /* 283 * Driver to swallow Grackle host bridges from the PCI bus side. 284 */ 285 static int 286 grackle_hb_probe(device_t dev) 287 { 288 289 if (pci_get_devid(dev) == 0x00021057) { 290 device_set_desc(dev, "Grackle Host to PCI bridge"); 291 device_quiet(dev); 292 return (0); 293 } 294 295 return (ENXIO); 296 } 297 298 static int 299 grackle_hb_attach(device_t dev) 300 { 301 302 return (0); 303 } 304 305 static device_method_t grackle_hb_methods[] = { 306 /* Device interface */ 307 DEVMETHOD(device_probe, grackle_hb_probe), 308 DEVMETHOD(device_attach, grackle_hb_attach), 309 { 0, 0 } 310 }; 311 312 static driver_t grackle_hb_driver = { 313 "grackle_hb", 314 grackle_hb_methods, 315 1, 316 }; 317 318 DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, 0, 0); 319