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 /* 86 * Driver methods. 87 */ 88 static device_method_t grackle_methods[] = { 89 /* Device interface */ 90 DEVMETHOD(device_probe, grackle_probe), 91 DEVMETHOD(device_attach, grackle_attach), 92 93 /* pcib interface */ 94 DEVMETHOD(pcib_read_config, grackle_read_config), 95 DEVMETHOD(pcib_write_config, grackle_write_config), 96 97 DEVMETHOD_END 98 }; 99 100 static devclass_t grackle_devclass; 101 DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods, 102 sizeof(struct grackle_softc), ofw_pci_driver); 103 DRIVER_MODULE(grackle, ofwbus, grackle_driver, grackle_devclass, 0, 0); 104 105 static int 106 grackle_probe(device_t dev) 107 { 108 const char *type, *compatible; 109 110 type = ofw_bus_get_type(dev); 111 compatible = ofw_bus_get_compat(dev); 112 113 if (type == NULL || compatible == NULL) 114 return (ENXIO); 115 116 if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0) 117 return (ENXIO); 118 119 device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge"); 120 return (0); 121 } 122 123 static int 124 grackle_attach(device_t dev) 125 { 126 struct grackle_softc *sc; 127 128 sc = device_get_softc(dev); 129 130 /* 131 * The Grackle PCI config addr/data registers are actually in 132 * PCI space, but since they are needed to actually probe the 133 * PCI bus, use the fact that they are also available directly 134 * on the processor bus and map them 135 */ 136 sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE); 137 sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE); 138 139 return (ofw_pci_attach(dev)); 140 } 141 142 static u_int32_t 143 grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 144 int width) 145 { 146 struct grackle_softc *sc; 147 vm_offset_t caoff; 148 u_int32_t retval = 0xffffffff; 149 150 sc = device_get_softc(dev); 151 caoff = sc->sc_data + (reg & 0x03); 152 153 if (grackle_enable_config(sc, bus, slot, func, reg) != 0) { 154 155 /* 156 * Config probes to non-existent devices on the 157 * secondary bus generates machine checks. Be sure 158 * to catch these. 159 */ 160 if (bus > 0) { 161 if (badaddr((void *)sc->sc_data, 4)) { 162 return (retval); 163 } 164 } 165 166 switch (width) { 167 case 1: 168 retval = (in8rb(caoff)); 169 break; 170 case 2: 171 retval = (in16rb(caoff)); 172 break; 173 case 4: 174 retval = (in32rb(caoff)); 175 break; 176 } 177 } 178 grackle_disable_config(sc); 179 180 return (retval); 181 } 182 183 static void 184 grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func, 185 u_int reg, u_int32_t val, int width) 186 { 187 struct grackle_softc *sc; 188 vm_offset_t caoff; 189 190 sc = device_get_softc(dev); 191 caoff = sc->sc_data + (reg & 0x03); 192 193 if (grackle_enable_config(sc, bus, slot, func, reg)) { 194 switch (width) { 195 case 1: 196 out8rb(caoff, val); 197 (void)in8rb(caoff); 198 break; 199 case 2: 200 out16rb(caoff, val); 201 (void)in16rb(caoff); 202 break; 203 case 4: 204 out32rb(caoff, val); 205 (void)in32rb(caoff); 206 break; 207 } 208 } 209 grackle_disable_config(sc); 210 } 211 212 static int 213 grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot, 214 u_int func, u_int reg) 215 { 216 u_int32_t cfgval; 217 218 /* 219 * Unlike UniNorth, the format of the config word is the same 220 * for local (0) and remote busses. 221 */ 222 cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC) 223 | GRACKLE_CFG_ENABLE; 224 225 out32rb(sc->sc_addr, cfgval); 226 (void) in32rb(sc->sc_addr); 227 228 return (1); 229 } 230 231 static void 232 grackle_disable_config(struct grackle_softc *sc) 233 { 234 /* 235 * Clear the GRACKLE_CFG_ENABLE bit to prevent stray 236 * accesses from causing config cycles 237 */ 238 out32rb(sc->sc_addr, 0); 239 } 240 241 static int 242 badaddr(void *addr, size_t size) 243 { 244 struct thread *td; 245 jmp_buf env, *oldfaultbuf; 246 int x; 247 248 /* Get rid of any stale machine checks that have been waiting. */ 249 __asm __volatile ("sync; isync"); 250 251 td = curthread; 252 253 oldfaultbuf = td->td_pcb->pcb_onfault; 254 td->td_pcb->pcb_onfault = &env; 255 if (setjmp(env)) { 256 td->td_pcb->pcb_onfault = oldfaultbuf; 257 __asm __volatile ("sync"); 258 return 1; 259 } 260 261 __asm __volatile ("sync"); 262 263 switch (size) { 264 case 1: 265 x = *(volatile int8_t *)addr; 266 break; 267 case 2: 268 x = *(volatile int16_t *)addr; 269 break; 270 case 4: 271 x = *(volatile int32_t *)addr; 272 break; 273 default: 274 panic("badaddr: invalid size (%zd)", size); 275 } 276 277 /* Make sure we took the machine check, if we caused one. */ 278 __asm __volatile ("sync; isync"); 279 280 td->td_pcb->pcb_onfault = oldfaultbuf; 281 __asm __volatile ("sync"); /* To be sure. */ 282 283 return (0); 284 } 285 286 /* 287 * Driver to swallow Grackle host bridges from the PCI bus side. 288 */ 289 static int 290 grackle_hb_probe(device_t dev) 291 { 292 293 if (pci_get_devid(dev) == 0x00021057) { 294 device_set_desc(dev, "Grackle Host to PCI bridge"); 295 device_quiet(dev); 296 return (0); 297 } 298 299 return (ENXIO); 300 } 301 302 static int 303 grackle_hb_attach(device_t dev) 304 { 305 306 return (0); 307 } 308 309 static device_method_t grackle_hb_methods[] = { 310 /* Device interface */ 311 DEVMETHOD(device_probe, grackle_hb_probe), 312 DEVMETHOD(device_attach, grackle_hb_attach), 313 314 { 0, 0 } 315 }; 316 317 static driver_t grackle_hb_driver = { 318 "grackle_hb", 319 grackle_hb_methods, 320 1, 321 }; 322 static devclass_t grackle_hb_devclass; 323 324 DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, grackle_hb_devclass, 0, 0); 325