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/param.h>
31 #include <sys/systm.h>
32 #include <sys/module.h>
33 #include <sys/bus.h>
34 #include <sys/conf.h>
35 #include <sys/kernel.h>
36 #include <sys/proc.h>
37 #include <sys/rman.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 #include <dev/ofw/ofwpci.h>
44
45 #include <dev/pci/pcivar.h>
46 #include <dev/pci/pcireg.h>
47
48 #include <machine/bus.h>
49 #include <machine/intr_machdep.h>
50 #include <machine/md_var.h>
51 #include <machine/pio.h>
52 #include <machine/resource.h>
53
54 #include <powerpc/powermac/gracklevar.h>
55
56 #include <vm/vm.h>
57 #include <vm/pmap.h>
58
59 #include "pcib_if.h"
60
61 /*
62 * Device interface.
63 */
64 static int grackle_probe(device_t);
65 static int grackle_attach(device_t);
66
67 /*
68 * pcib interface.
69 */
70 static u_int32_t grackle_read_config(device_t, u_int, u_int, u_int,
71 u_int, int);
72 static void grackle_write_config(device_t, u_int, u_int, u_int,
73 u_int, u_int32_t, int);
74
75 /*
76 * Local routines.
77 */
78 static int grackle_enable_config(struct grackle_softc *, u_int,
79 u_int, u_int, u_int);
80 static void grackle_disable_config(struct grackle_softc *);
81 static int badaddr(void *, size_t);
82
83 /*
84 * Driver methods.
85 */
86 static device_method_t grackle_methods[] = {
87 /* Device interface */
88 DEVMETHOD(device_probe, grackle_probe),
89 DEVMETHOD(device_attach, grackle_attach),
90
91 /* pcib interface */
92 DEVMETHOD(pcib_read_config, grackle_read_config),
93 DEVMETHOD(pcib_write_config, grackle_write_config),
94
95 DEVMETHOD_END
96 };
97
98 DEFINE_CLASS_1(pcib, grackle_driver, grackle_methods,
99 sizeof(struct grackle_softc), ofw_pcib_driver);
100 DRIVER_MODULE(grackle, ofwbus, grackle_driver, 0, 0);
101
102 static int
grackle_probe(device_t dev)103 grackle_probe(device_t dev)
104 {
105 const char *type, *compatible;
106
107 type = ofw_bus_get_type(dev);
108 compatible = ofw_bus_get_compat(dev);
109
110 if (type == NULL || compatible == NULL)
111 return (ENXIO);
112
113 if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0)
114 return (ENXIO);
115
116 device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge");
117 return (0);
118 }
119
120 static int
grackle_attach(device_t dev)121 grackle_attach(device_t dev)
122 {
123 struct grackle_softc *sc;
124
125 sc = device_get_softc(dev);
126
127 /*
128 * The Grackle PCI config addr/data registers are actually in
129 * PCI space, but since they are needed to actually probe the
130 * PCI bus, use the fact that they are also available directly
131 * on the processor bus and map them
132 */
133 sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE);
134 sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE);
135
136 return (ofw_pcib_attach(dev));
137 }
138
139 static u_int32_t
grackle_read_config(device_t dev,u_int bus,u_int slot,u_int func,u_int reg,int width)140 grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
141 int width)
142 {
143 struct grackle_softc *sc;
144 vm_offset_t caoff;
145 u_int32_t retval = 0xffffffff;
146
147 sc = device_get_softc(dev);
148 caoff = sc->sc_data + (reg & 0x03);
149
150 if (grackle_enable_config(sc, bus, slot, func, reg) != 0) {
151 /*
152 * Config probes to non-existent devices on the
153 * secondary bus generates machine checks. Be sure
154 * to catch these.
155 */
156 if (bus > 0) {
157 if (badaddr((void *)sc->sc_data, 4)) {
158 return (retval);
159 }
160 }
161
162 switch (width) {
163 case 1:
164 retval = (in8rb(caoff));
165 break;
166 case 2:
167 retval = (in16rb(caoff));
168 break;
169 case 4:
170 retval = (in32rb(caoff));
171 break;
172 }
173 }
174 grackle_disable_config(sc);
175
176 return (retval);
177 }
178
179 static void
grackle_write_config(device_t dev,u_int bus,u_int slot,u_int func,u_int reg,u_int32_t val,int width)180 grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func,
181 u_int reg, u_int32_t val, int width)
182 {
183 struct grackle_softc *sc;
184 vm_offset_t caoff;
185
186 sc = device_get_softc(dev);
187 caoff = sc->sc_data + (reg & 0x03);
188
189 if (grackle_enable_config(sc, bus, slot, func, reg)) {
190 switch (width) {
191 case 1:
192 out8rb(caoff, val);
193 (void)in8rb(caoff);
194 break;
195 case 2:
196 out16rb(caoff, val);
197 (void)in16rb(caoff);
198 break;
199 case 4:
200 out32rb(caoff, val);
201 (void)in32rb(caoff);
202 break;
203 }
204 }
205 grackle_disable_config(sc);
206 }
207
208 static int
grackle_enable_config(struct grackle_softc * sc,u_int bus,u_int slot,u_int func,u_int reg)209 grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot,
210 u_int func, u_int reg)
211 {
212 u_int32_t cfgval;
213
214 /*
215 * Unlike UniNorth, the format of the config word is the same
216 * for local (0) and remote busses.
217 */
218 cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC)
219 | GRACKLE_CFG_ENABLE;
220
221 out32rb(sc->sc_addr, cfgval);
222 (void) in32rb(sc->sc_addr);
223
224 return (1);
225 }
226
227 static void
grackle_disable_config(struct grackle_softc * sc)228 grackle_disable_config(struct grackle_softc *sc)
229 {
230 /*
231 * Clear the GRACKLE_CFG_ENABLE bit to prevent stray
232 * accesses from causing config cycles
233 */
234 out32rb(sc->sc_addr, 0);
235 }
236
237 static int
badaddr(void * addr,size_t size)238 badaddr(void *addr, size_t size)
239 {
240 struct thread *td;
241 jmp_buf env, *oldfaultbuf;
242
243 /* Get rid of any stale machine checks that have been waiting. */
244 __asm __volatile ("sync; isync");
245
246 td = curthread;
247
248 oldfaultbuf = td->td_pcb->pcb_onfault;
249 td->td_pcb->pcb_onfault = &env;
250 if (setjmp(env)) {
251 td->td_pcb->pcb_onfault = oldfaultbuf;
252 __asm __volatile ("sync");
253 return 1;
254 }
255
256 __asm __volatile ("sync");
257
258 switch (size) {
259 case 1:
260 (void)*(volatile int8_t *)addr;
261 break;
262 case 2:
263 (void)*(volatile int16_t *)addr;
264 break;
265 case 4:
266 (void)*(volatile int32_t *)addr;
267 break;
268 default:
269 panic("badaddr: invalid size (%zd)", size);
270 }
271
272 /* Make sure we took the machine check, if we caused one. */
273 __asm __volatile ("sync; isync");
274
275 td->td_pcb->pcb_onfault = oldfaultbuf;
276 __asm __volatile ("sync"); /* To be sure. */
277
278 return (0);
279 }
280
281 /*
282 * Driver to swallow Grackle host bridges from the PCI bus side.
283 */
284 static int
grackle_hb_probe(device_t dev)285 grackle_hb_probe(device_t dev)
286 {
287
288 if (pci_get_devid(dev) == 0x00021057) {
289 device_set_desc(dev, "Grackle Host to PCI bridge");
290 device_quiet(dev);
291 return (0);
292 }
293
294 return (ENXIO);
295 }
296
297 static int
grackle_hb_attach(device_t dev)298 grackle_hb_attach(device_t dev)
299 {
300
301 return (0);
302 }
303
304 static device_method_t grackle_hb_methods[] = {
305 /* Device interface */
306 DEVMETHOD(device_probe, grackle_hb_probe),
307 DEVMETHOD(device_attach, grackle_hb_attach),
308 { 0, 0 }
309 };
310
311 static driver_t grackle_hb_driver = {
312 "grackle_hb",
313 grackle_hb_methods,
314 1,
315 };
316
317 DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, 0, 0);
318