xref: /netbsd-src/sys/arch/prep/pci/pci_machdep.c (revision b7b7574d3bf8eeb51a1fa3977b59142ec6434a55)
1 /*	$NetBSD: pci_machdep.c,v 1.40 2014/04/03 23:49:47 mrg Exp $	*/
2 
3 /*
4  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
5  * Copyright (c) 1994 Charles M. Hannum.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *	This product includes software developed by Charles M. Hannum.
18  * 4. The name of the author may not be used to endorse or promote products
19  *    derived from this software without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 
33 /*
34  * Machine-specific functions for PCI autoconfiguration.
35  *
36  * On PCs, there are two methods of generating PCI configuration cycles.
37  * We try to detect the appropriate mechanism for this machine and set
38  * up a few function pointers to access the correct method directly.
39  */
40 
41 #include <sys/cdefs.h>
42 __KERNEL_RCSID(0, "$NetBSD: pci_machdep.c,v 1.40 2014/04/03 23:49:47 mrg Exp $");
43 
44 #include <sys/types.h>
45 #include <sys/param.h>
46 #include <sys/time.h>
47 #include <sys/systm.h>
48 #include <sys/errno.h>
49 #include <sys/extent.h>
50 #include <sys/device.h>
51 #include <sys/malloc.h>
52 
53 #include <uvm/uvm_extern.h>
54 
55 #define _POWERPC_BUS_DMA_PRIVATE
56 #include <sys/bus.h>
57 #include <machine/intr.h>
58 #include <machine/platform.h>
59 #include <machine/pnp.h>
60 
61 #include <dev/isa/isavar.h>
62 
63 #include <dev/pci/pcivar.h>
64 #include <dev/pci/pcireg.h>
65 #include <dev/pci/pcidevs.h>
66 #include <dev/pci/pciconf.h>
67 
68 /* 0 == direct 1 == indirect */
69 int prep_pci_config_mode = 1;
70 extern struct genppc_pci_chipset *genppc_pct;
71 extern u_int32_t prep_pci_baseaddr;
72 extern u_int32_t prep_pci_basedata;
73 
74 static void
75 prep_pci_get_chipset_tag_indirect(pci_chipset_tag_t pc)
76 {
77 
78 	pc->pc_conf_v = (void *)pc;
79 
80 	pc->pc_attach_hook = genppc_pci_indirect_attach_hook;
81 	pc->pc_bus_maxdevs = prep_pci_bus_maxdevs;
82 	pc->pc_make_tag = genppc_pci_indirect_make_tag;
83 	pc->pc_conf_read = genppc_pci_indirect_conf_read;
84 	pc->pc_conf_write = genppc_pci_indirect_conf_write;
85 
86 	pc->pc_intr_v = (void *)pc;
87 
88 	pc->pc_intr_map = prep_pci_intr_map;
89 	pc->pc_intr_string = genppc_pci_intr_string;
90 	pc->pc_intr_evcnt = genppc_pci_intr_evcnt;
91 	pc->pc_intr_establish = genppc_pci_intr_establish;
92 	pc->pc_intr_disestablish = genppc_pci_intr_disestablish;
93 	pc->pc_intr_setattr = genppc_pci_intr_setattr;
94 
95 	pc->pc_msi_v = (void *)pc;
96 	genppc_pci_chipset_msi_init(pc);
97 
98 	pc->pc_conf_interrupt = genppc_pci_conf_interrupt;
99 	pc->pc_decompose_tag = genppc_pci_indirect_decompose_tag;
100 	pc->pc_conf_hook = prep_pci_conf_hook;
101 
102 	pc->pc_addr = mapiodev(prep_pci_baseaddr, 4, false);
103 	pc->pc_data = mapiodev(prep_pci_basedata, 4, false);
104 	pc->pc_bus = 0;
105 	pc->pc_node = 0;
106 	pc->pc_memt = 0;
107 	pc->pc_iot = 0;
108 }
109 
110 void
111 prep_pci_get_chipset_tag(pci_chipset_tag_t pc)
112 {
113 	int i;
114 
115 	i = pci_chipset_tag_type();
116 
117 	if (i == PCIBridgeIndirect || i == PCIBridgeRS6K) {
118 		prep_pci_config_mode = 1;
119 		prep_pci_get_chipset_tag_indirect(pc);
120 	} else if (i == PCIBridgeDirect) {
121 		prep_pci_get_chipset_tag_direct(pc);
122 		prep_pci_config_mode = 0;
123 	} else
124 		panic("Unknown PCI chipset tag configuration method");
125 }
126 
127 int
128 prep_pci_bus_maxdevs(void *v, int busno)
129 {
130 	struct genppc_pci_chipset_businfo *pbi;
131 	prop_object_t busmax;
132 
133 	pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi);
134 	while (busno--)
135 		pbi = SIMPLEQ_NEXT(pbi, next);
136 	if (pbi == NULL)
137 		return 32;
138 
139 	busmax = prop_dictionary_get(pbi->pbi_properties,
140 	    "prep-pcibus-maxdevices");
141 	if (busmax == NULL)
142 		return 32;
143 	else
144 		return prop_number_integer_value(busmax);
145 
146 	return 32;
147 }
148 
149 int
150 prep_pci_intr_map(const struct pci_attach_args *pa, pci_intr_handle_t *ihp)
151 {
152 	struct genppc_pci_chipset_businfo *pbi;
153 	prop_dictionary_t dict, devsub;
154 	prop_object_t pinsub;
155 	prop_number_t pbus;
156 	int busno, pin, line, dev, origdev, i;
157 	char key[20];
158 
159 	pin = pa->pa_intrpin;
160 	line = pa->pa_intrline;
161 	busno = pa->pa_bus;
162 	origdev = dev = pa->pa_device;
163 	i = 0;
164 
165 	pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi);
166 	while (busno--)
167 		pbi = SIMPLEQ_NEXT(pbi, next);
168 	KASSERT(pbi != NULL);
169 
170 	dict = prop_dictionary_get(pbi->pbi_properties, "prep-pci-intrmap");
171 
172 	if (dict != NULL)
173 		i = prop_dictionary_count(dict);
174 
175 	if (dict == NULL || i == 0) {
176 		/* We have a non-PReP bus.  now it gets hard */
177 		pbus = prop_dictionary_get(pbi->pbi_properties,
178 		    "prep-pcibus-parent");
179 		if (pbus == NULL)
180 			goto bad;
181 		busno = prop_number_integer_value(pbus);
182 		pbus = prop_dictionary_get(pbi->pbi_properties,
183 		    "prep-pcibus-rawdevnum");
184 		dev = prop_number_integer_value(pbus);
185 
186 		/* now that we know the parent bus, we need to find it's pbi */
187 		pbi = SIMPLEQ_FIRST(&genppc_pct->pc_pbi);
188 		while (busno--)
189 			pbi = SIMPLEQ_NEXT(pbi, next);
190 		KASSERT(pbi != NULL);
191 
192 		/* swizzle the pin */
193 		pin = ((pin + origdev - 1) & 3) + 1;
194 
195 		/* now we have the pbi, ask for dict again */
196 		dict = prop_dictionary_get(pbi->pbi_properties,
197 		    "prep-pci-intrmap");
198 		if (dict == NULL)
199 			goto bad;
200 	}
201 
202 	/* No IRQ used. */
203 	if (pin == 0)
204 		goto bad;
205 	if (pin > 4) {
206 		aprint_error("pci_intr_map: bad interrupt pin %d\n", pin);
207 		goto bad;
208 	}
209 
210 	snprintf(key, sizeof(key), "devfunc-%d", dev);
211 	devsub = prop_dictionary_get(dict, key);
212 	if (devsub == NULL)
213 		goto bad;
214 	snprintf(key, sizeof(key), "pin-%c", 'A' + (pin-1));
215 	pinsub = prop_dictionary_get(devsub, key);
216 	if (pinsub == NULL)
217 		goto bad;
218 	line = prop_number_integer_value(pinsub);
219 
220 	/*
221 	* Section 6.2.4, `Miscellaneous Functions', says that 255 means
222 	* `unknown' or `no connection' on a PC.  We assume that a device with
223 	* `no connection' either doesn't have an interrupt (in which case the
224 	* pin number should be 0, and would have been noticed above), or
225 	* wasn't configured by the BIOS (in which case we punt, since there's
226 	* no real way we can know how the interrupt lines are mapped in the
227 	* hardware).
228 	*
229 	* XXX
230 	* Since IRQ 0 is only used by the clock, and we can't actually be sure
231 	* that the BIOS did its job, we also recognize that as meaning that
232 	* the BIOS has not configured the device.
233 	*/
234 	if (line == 0 || line == 255) {
235 		aprint_error("pci_intr_map: no mapping for pin %c\n",
236 		    '@' + pin);
237 		goto bad;
238 	} else {
239 		if (line >= ICU_LEN) {
240 			aprint_error("pci_intr_map: bad interrupt line %d\n",
241 			    line);
242 			goto bad;
243 		}
244 		if (line == IRQ_SLAVE) {
245 			aprint_verbose("pci_intr_map: changed line 2 to line 9\n");
246 			line = 9;
247 		}
248 	}
249 
250 	*ihp = line;
251 	return 0;
252 
253 bad:
254 	*ihp = -1;
255 	return 1;
256 }
257 
258 extern pcitag_t prep_pci_direct_make_tag(void *, int, int, int);
259 extern pcitag_t genppc_pci_indirect_make_tag(void *, int, int, int);
260 extern pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int);
261 extern pcireg_t genppc_pci_indirect_conf_read(void *, pcitag_t, int);
262 
263 int
264 prep_pci_conf_hook(void *v, int bus, int dev, int func, pcireg_t id)
265 {
266 	pci_chipset_tag_t pc = v;
267 	struct genppc_pci_chipset_businfo *pbi;
268 	prop_number_t bmax, pbus;
269 	pcitag_t tag;
270 	pcireg_t class;
271 
272 	/*
273 	 * The P9100 board found in some IBM machines cannot be
274 	 * over-configured.
275 	 */
276 	if (PCI_VENDOR(id) == PCI_VENDOR_WEITEK &&
277 	    PCI_PRODUCT(id) == PCI_PRODUCT_WEITEK_P9100)
278 		return 0;
279 
280 	/* We have already mapped the MPIC2 if we have one, so leave it
281 	   alone */
282 	if (PCI_VENDOR(id) == PCI_VENDOR_IBM &&
283 	    PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC2)
284 		return 0;
285 
286 	if (PCI_VENDOR(id) == PCI_VENDOR_IBM &&
287 	    PCI_PRODUCT(id) == PCI_PRODUCT_IBM_MPIC)
288 		return 0;
289 
290 	if (PCI_VENDOR(id) == PCI_VENDOR_INTEL &&
291 	    PCI_PRODUCT(id) == PCI_PRODUCT_INTEL_PCEB)
292 		return 0;
293 
294 	if (PCI_VENDOR(id) == PCI_VENDOR_MOT &&
295 	    PCI_PRODUCT(id) == PCI_PRODUCT_MOT_RAVEN)
296 		return (PCI_CONF_ALL & ~PCI_CONF_MAP_MEM);
297 
298 	/* NOTE, all device specific stuff must be above this line */
299 	/* don't do this on the primary host bridge */
300 	if (bus == 0 && dev == 0 && func == 0)
301 		return PCI_CONF_DEFAULT;
302 
303 	if (prep_pci_config_mode) {
304 		tag = genppc_pci_indirect_make_tag(pc, bus, dev, func);
305 		class = genppc_pci_indirect_conf_read(pc, tag,
306 		    PCI_CLASS_REG);
307 	} else {
308 		tag = prep_pci_direct_make_tag(pc, bus, dev, func);
309 		class = prep_pci_direct_conf_read(pc, tag,
310 		    PCI_CLASS_REG);
311 	}
312 
313 	/*
314 	 * PCI bridges have special needs.  We need to discover where they
315 	 * came from, and wire them appropriately.
316 	 */
317 	if (PCI_CLASS(class) == PCI_CLASS_BRIDGE &&
318 	    PCI_SUBCLASS(class) == PCI_SUBCLASS_BRIDGE_PCI) {
319 		pbi = malloc(sizeof(struct genppc_pci_chipset_businfo),
320 		    M_DEVBUF, M_NOWAIT);
321 		KASSERT(pbi != NULL);
322 		pbi->pbi_properties = prop_dictionary_create();
323 		KASSERT(pbi->pbi_properties != NULL);
324 		setup_pciintr_map(pbi, bus, dev, func);
325 
326 		/* record the parent bus, and the parent device number */
327 		pbus = prop_number_create_integer(bus);
328 		prop_dictionary_set(pbi->pbi_properties, "prep-pcibus-parent",
329 		    pbus);
330 		prop_object_release(pbus);
331 		pbus = prop_number_create_integer(dev);
332 		prop_dictionary_set(pbi->pbi_properties,
333 		    "prep-pcibus-rawdevnum", pbus);
334 		prop_object_release(pbus);
335 
336 		/* now look for bus quirks */
337 
338 		if (PCI_VENDOR(id) == PCI_VENDOR_DEC &&
339 		    PCI_PRODUCT(id) == PCI_PRODUCT_DEC_21154) {
340 			bmax = prop_number_create_integer(8);
341 			KASSERT(bmax != NULL);
342 			prop_dictionary_set(pbi->pbi_properties,
343 			    "prep-pcibus-maxdevices", bmax);
344 			prop_object_release(bmax);
345 		}
346 
347 		SIMPLEQ_INSERT_TAIL(&genppc_pct->pc_pbi, pbi, next);
348 	}
349 
350 	return (PCI_CONF_DEFAULT);
351 }
352