1 /*- 2 * Copyright 2003 by Peter Grehan. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 3. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 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 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 44 #include <dev/pci/pcivar.h> 45 #include <dev/pci/pcireg.h> 46 47 #include <machine/bus.h> 48 #include <machine/intr_machdep.h> 49 #include <machine/md_var.h> 50 #include <machine/pio.h> 51 #include <machine/resource.h> 52 53 #include <sys/rman.h> 54 55 #include <powerpc/ofw/ofw_pci.h> 56 #include <powerpc/powermac/gracklevar.h> 57 58 #include <vm/vm.h> 59 #include <vm/pmap.h> 60 61 #include "pcib_if.h" 62 63 /* 64 * Device interface. 65 */ 66 static int grackle_probe(device_t); 67 static int grackle_attach(device_t); 68 69 /* 70 * pcib interface. 71 */ 72 static u_int32_t grackle_read_config(device_t, u_int, u_int, u_int, 73 u_int, int); 74 static void grackle_write_config(device_t, u_int, u_int, u_int, 75 u_int, u_int32_t, int); 76 77 /* 78 * Local routines. 79 */ 80 static int grackle_enable_config(struct grackle_softc *, u_int, 81 u_int, u_int, u_int); 82 static void grackle_disable_config(struct grackle_softc *); 83 static int badaddr(void *, size_t); 84 85 int setfault(faultbuf); /* defined in locore.S */ 86 87 /* 88 * Driver methods. 89 */ 90 static device_method_t grackle_methods[] = { 91 /* Device interface */ 92 DEVMETHOD(device_probe, grackle_probe), 93 DEVMETHOD(device_attach, grackle_attach), 94 95 /* pcib interface */ 96 DEVMETHOD(pcib_read_config, grackle_read_config), 97 DEVMETHOD(pcib_write_config, grackle_write_config), 98 99 DEVMETHOD_END 100 }; 101 102 static devclass_t grackle_devclass; 103 DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods, 104 sizeof(struct grackle_softc), ofw_pci_driver); 105 DRIVER_MODULE(grackle, ofwbus, grackle_driver, grackle_devclass, 0, 0); 106 107 static int 108 grackle_probe(device_t dev) 109 { 110 const char *type, *compatible; 111 112 type = ofw_bus_get_type(dev); 113 compatible = ofw_bus_get_compat(dev); 114 115 if (type == NULL || compatible == NULL) 116 return (ENXIO); 117 118 if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0) 119 return (ENXIO); 120 121 device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge"); 122 return (0); 123 } 124 125 static int 126 grackle_attach(device_t dev) 127 { 128 struct grackle_softc *sc; 129 130 sc = device_get_softc(dev); 131 132 /* 133 * The Grackle PCI config addr/data registers are actually in 134 * PCI space, but since they are needed to actually probe the 135 * PCI bus, use the fact that they are also available directly 136 * on the processor bus and map them 137 */ 138 sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE); 139 sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE); 140 141 return (ofw_pci_attach(dev)); 142 } 143 144 static u_int32_t 145 grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 146 int width) 147 { 148 struct grackle_softc *sc; 149 vm_offset_t caoff; 150 u_int32_t retval = 0xffffffff; 151 152 sc = device_get_softc(dev); 153 caoff = sc->sc_data + (reg & 0x03); 154 155 if (grackle_enable_config(sc, bus, slot, func, reg) != 0) { 156 157 /* 158 * Config probes to non-existent devices on the 159 * secondary bus generates machine checks. Be sure 160 * to catch these. 161 */ 162 if (bus > 0) { 163 if (badaddr((void *)sc->sc_data, 4)) { 164 return (retval); 165 } 166 } 167 168 switch (width) { 169 case 1: 170 retval = (in8rb(caoff)); 171 break; 172 case 2: 173 retval = (in16rb(caoff)); 174 break; 175 case 4: 176 retval = (in32rb(caoff)); 177 break; 178 } 179 } 180 grackle_disable_config(sc); 181 182 return (retval); 183 } 184 185 static void 186 grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func, 187 u_int reg, u_int32_t val, int width) 188 { 189 struct grackle_softc *sc; 190 vm_offset_t caoff; 191 192 sc = device_get_softc(dev); 193 caoff = sc->sc_data + (reg & 0x03); 194 195 if (grackle_enable_config(sc, bus, slot, func, reg)) { 196 switch (width) { 197 case 1: 198 out8rb(caoff, val); 199 (void)in8rb(caoff); 200 break; 201 case 2: 202 out16rb(caoff, val); 203 (void)in16rb(caoff); 204 break; 205 case 4: 206 out32rb(caoff, val); 207 (void)in32rb(caoff); 208 break; 209 } 210 } 211 grackle_disable_config(sc); 212 } 213 214 static int 215 grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot, 216 u_int func, u_int reg) 217 { 218 u_int32_t cfgval; 219 220 /* 221 * Unlike UniNorth, the format of the config word is the same 222 * for local (0) and remote busses. 223 */ 224 cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC) 225 | GRACKLE_CFG_ENABLE; 226 227 out32rb(sc->sc_addr, cfgval); 228 (void) in32rb(sc->sc_addr); 229 230 return (1); 231 } 232 233 static void 234 grackle_disable_config(struct grackle_softc *sc) 235 { 236 /* 237 * Clear the GRACKLE_CFG_ENABLE bit to prevent stray 238 * accesses from causing config cycles 239 */ 240 out32rb(sc->sc_addr, 0); 241 } 242 243 static int 244 badaddr(void *addr, size_t size) 245 { 246 struct thread *td; 247 faultbuf env, *oldfaultbuf; 248 int x; 249 250 /* Get rid of any stale machine checks that have been waiting. */ 251 __asm __volatile ("sync; isync"); 252 253 td = curthread; 254 255 oldfaultbuf = td->td_pcb->pcb_onfault; 256 if (setfault(env)) { 257 td->td_pcb->pcb_onfault = oldfaultbuf; 258 __asm __volatile ("sync"); 259 return 1; 260 } 261 262 __asm __volatile ("sync"); 263 264 switch (size) { 265 case 1: 266 x = *(volatile int8_t *)addr; 267 break; 268 case 2: 269 x = *(volatile int16_t *)addr; 270 break; 271 case 4: 272 x = *(volatile int32_t *)addr; 273 break; 274 default: 275 panic("badaddr: invalid size (%zd)", size); 276 } 277 278 /* Make sure we took the machine check, if we caused one. */ 279 __asm __volatile ("sync; isync"); 280 281 td->td_pcb->pcb_onfault = oldfaultbuf; 282 __asm __volatile ("sync"); /* To be sure. */ 283 284 return (0); 285 } 286 287 /* 288 * Driver to swallow Grackle host bridges from the PCI bus side. 289 */ 290 static int 291 grackle_hb_probe(device_t dev) 292 { 293 294 if (pci_get_devid(dev) == 0x00021057) { 295 device_set_desc(dev, "Grackle Host to PCI bridge"); 296 device_quiet(dev); 297 return (0); 298 } 299 300 return (ENXIO); 301 } 302 303 static int 304 grackle_hb_attach(device_t dev) 305 { 306 307 return (0); 308 } 309 310 static device_method_t grackle_hb_methods[] = { 311 /* Device interface */ 312 DEVMETHOD(device_probe, grackle_hb_probe), 313 DEVMETHOD(device_attach, grackle_hb_attach), 314 315 { 0, 0 } 316 }; 317 318 static driver_t grackle_hb_driver = { 319 "grackle_hb", 320 grackle_hb_methods, 321 1, 322 }; 323 static devclass_t grackle_hb_devclass; 324 325 DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, grackle_hb_devclass, 0, 0); 326