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__FBSDID("$FreeBSD$"); 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/module.h> 36#include <sys/bus.h> 37#include <sys/conf.h> 38#include <sys/kernel.h> 39#include <sys/proc.h> 40#include <sys/rman.h> 41 42#include <dev/ofw/openfirm.h> 43#include <dev/ofw/ofw_pci.h> 44#include <dev/ofw/ofw_bus.h> 45#include <dev/ofw/ofw_bus_subr.h> 46#include <dev/ofw/ofwpci.h> 47 48#include <dev/pci/pcivar.h> 49#include <dev/pci/pcireg.h> 50 51#include <machine/bus.h> 52#include <machine/intr_machdep.h> 53#include <machine/md_var.h> 54#include <machine/pio.h> 55#include <machine/resource.h> 56 57#include <powerpc/powermac/gracklevar.h> 58 59#include <vm/vm.h> 60#include <vm/pmap.h> 61 62#include "pcib_if.h" 63 64/* 65 * Device interface. 66 */ 67static int grackle_probe(device_t); 68static int grackle_attach(device_t); 69 70/* 71 * pcib interface. 72 */ 73static u_int32_t grackle_read_config(device_t, u_int, u_int, u_int, 74 u_int, int); 75static void grackle_write_config(device_t, u_int, u_int, u_int, 76 u_int, u_int32_t, int); 77 78/* 79 * Local routines. 80 */ 81static int grackle_enable_config(struct grackle_softc *, u_int, 82 u_int, u_int, u_int); 83static void grackle_disable_config(struct grackle_softc *); 84static int badaddr(void *, size_t); 85 86/* 87 * Driver methods. 88 */ 89static device_method_t grackle_methods[] = { 90 /* Device interface */ 91 DEVMETHOD(device_probe, grackle_probe), 92 DEVMETHOD(device_attach, grackle_attach), 93 94 /* pcib interface */ 95 DEVMETHOD(pcib_read_config, grackle_read_config), 96 DEVMETHOD(pcib_write_config, grackle_write_config), 97 98 DEVMETHOD_END 99}; 100 101static devclass_t grackle_devclass; 102DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods, 103 sizeof(struct grackle_softc), ofw_pci_driver); 104DRIVER_MODULE(grackle, ofwbus, grackle_driver, grackle_devclass, 0, 0); 105 106static int 107grackle_probe(device_t dev) 108{ 109 const char *type, *compatible; 110 111 type = ofw_bus_get_type(dev); 112 compatible = ofw_bus_get_compat(dev); 113 114 if (type == NULL || compatible == NULL) 115 return (ENXIO); 116 117 if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0) 118 return (ENXIO); 119 120 device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge"); 121 return (0); 122} 123 124static int 125grackle_attach(device_t dev) 126{ 127 struct grackle_softc *sc; 128 129 sc = device_get_softc(dev); 130 131 /* 132 * The Grackle PCI config addr/data registers are actually in 133 * PCI space, but since they are needed to actually probe the 134 * PCI bus, use the fact that they are also available directly 135 * on the processor bus and map them 136 */ 137 sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE); 138 sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE); 139 140 return (ofw_pci_attach(dev)); 141} 142 143static u_int32_t 144grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg, 145 int width) 146{ 147 struct grackle_softc *sc; 148 vm_offset_t caoff; 149 u_int32_t retval = 0xffffffff; 150 151 sc = device_get_softc(dev); 152 caoff = sc->sc_data + (reg & 0x03); 153 154 if (grackle_enable_config(sc, bus, slot, func, reg) != 0) { 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 183static void 184grackle_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 212static int 213grackle_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 231static void 232grackle_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 241static int 242badaddr(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 */ 289static int 290grackle_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 302static int 303grackle_hb_attach(device_t dev) 304{ 305 306 return (0); 307} 308 309static device_method_t grackle_hb_methods[] = { 310 /* Device interface */ 311 DEVMETHOD(device_probe, grackle_hb_probe), 312 DEVMETHOD(device_attach, grackle_hb_attach), 313 { 0, 0 } 314}; 315 316static driver_t grackle_hb_driver = { 317 "grackle_hb", 318 grackle_hb_methods, 319 1, 320}; 321static devclass_t grackle_hb_devclass; 322 323DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, grackle_hb_devclass, 0, 0); 324