xref: /freebsd/sys/powerpc/ofw/ofw_pcibus.c (revision 4a5216a6dc0c3ce4cf5f2d3ee8af0c3ff3402c4f)
1 /*-
2  * Copyright (c) 1994 Charles M. Hannum.  All rights reserved.
3  * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
4  * Copyright (c) 1997, Stefan Esser <se@freebsd.org>
5  * Copyright (c) 2000, Michael Smith <msmith@freebsd.org>
6  * Copyright (c) 2000, BSDi
7  * Copyright (c) 2003, Thomas Moestl <tmm@FreeBSD.org>
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice unmodified, this list of conditions, and the following
15  *    disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34 
35 #include <sys/param.h>
36 #include <sys/bus.h>
37 #include <sys/kernel.h>
38 #include <sys/libkern.h>
39 #include <sys/module.h>
40 #include <sys/pciio.h>
41 
42 #include <dev/ofw/ofw_bus.h>
43 #include <dev/ofw/ofw_bus_subr.h>
44 #include <dev/ofw/ofw_pci.h>
45 #include <dev/ofw/openfirm.h>
46 
47 #include <machine/bus.h>
48 #include <machine/resource.h>
49 
50 #include <dev/pci/pcireg.h>
51 #include <dev/pci/pcivar.h>
52 #include <dev/pci/pci_private.h>
53 
54 #include "pcib_if.h"
55 #include "pci_if.h"
56 
57 /* Helper functions */
58 static int  find_node_intr(phandle_t, u_int32_t *, u_int32_t *);
59 static int  ofw_pci_find_intline(phandle_t node, uint32_t *irqs);
60 static void ofw_pci_fixup_node(device_t dev, phandle_t node);
61 
62 /* Methods */
63 static device_probe_t ofw_pcibus_probe;
64 static device_attach_t ofw_pcibus_attach;
65 static pci_assign_interrupt_t ofw_pcibus_assign_interrupt;
66 static ofw_bus_get_devinfo_t ofw_pcibus_get_devinfo;
67 
68 static device_method_t ofw_pcibus_methods[] = {
69 	/* Device interface */
70 	DEVMETHOD(device_probe,		ofw_pcibus_probe),
71 	DEVMETHOD(device_attach,	ofw_pcibus_attach),
72 
73 	/* PCI interface */
74 	DEVMETHOD(pci_assign_interrupt, ofw_pcibus_assign_interrupt),
75 
76 	/* ofw_bus interface */
77 	DEVMETHOD(ofw_bus_get_devinfo,	ofw_pcibus_get_devinfo),
78 	DEVMETHOD(ofw_bus_get_compat,	ofw_bus_gen_get_compat),
79 	DEVMETHOD(ofw_bus_get_model,	ofw_bus_gen_get_model),
80 	DEVMETHOD(ofw_bus_get_name,	ofw_bus_gen_get_name),
81 	DEVMETHOD(ofw_bus_get_node,	ofw_bus_gen_get_node),
82 	DEVMETHOD(ofw_bus_get_type,	ofw_bus_gen_get_type),
83 
84 	{ 0, 0 }
85 };
86 
87 struct ofw_pcibus_devinfo {
88 	struct pci_devinfo	opd_dinfo;
89 	struct ofw_bus_devinfo	opd_obdinfo;
90 };
91 
92 static devclass_t pci_devclass;
93 
94 DEFINE_CLASS_1(pci, ofw_pcibus_driver, ofw_pcibus_methods, 1 /* no softc */,
95     pci_driver);
96 DRIVER_MODULE(ofw_pcibus, pcib, ofw_pcibus_driver, pci_devclass, 0, 0);
97 MODULE_VERSION(ofw_pcibus, 1);
98 MODULE_DEPEND(ofw_pcibus, pci, 1, 1, 1);
99 
100 static int
101 ofw_pcibus_probe(device_t dev)
102 {
103 	if (ofw_bus_get_node(dev) == 0)
104 		return (ENXIO);
105 	device_set_desc(dev, "OFW PCI bus");
106 
107 	return (0);
108 }
109 
110 static int
111 ofw_pcibus_attach(device_t dev)
112 {
113 	device_t pcib;
114 	struct ofw_pci_register pcir;
115 	struct ofw_pcibus_devinfo *dinfo;
116 	phandle_t node, child;
117 	u_int busno, domain, func, slot;
118 
119 	pcib = device_get_parent(dev);
120 	domain = pcib_get_domain(dev);
121 	busno = pcib_get_bus(dev);
122 	if (bootverbose)
123 		device_printf(dev, "domain=%d, physical bus=%d\n",
124 		    domain, busno);
125 	node = ofw_bus_get_node(dev);
126 
127 	for (child = OF_child(node); child != 0; child = OF_peer(child)) {
128 		if (OF_getprop(child, "reg", &pcir, sizeof(pcir)) == -1)
129 			continue;
130 		slot = OFW_PCI_PHYS_HI_DEVICE(pcir.phys_hi);
131 		func = OFW_PCI_PHYS_HI_FUNCTION(pcir.phys_hi);
132 
133 		/* Some OFW device trees contain dupes. */
134 		if (pci_find_dbsf(domain, busno, slot, func) != NULL)
135 			continue;
136 
137 		ofw_pci_fixup_node(pcib, child);
138 
139 		dinfo = (struct ofw_pcibus_devinfo *)pci_read_device(pcib,
140 		    domain, busno, slot, func, sizeof(*dinfo));
141 
142 		if (dinfo == NULL)
143 			continue;
144 
145 		/* Set up OFW devinfo */
146 		if (ofw_bus_gen_setup_devinfo(&dinfo->opd_obdinfo, child) !=
147 		    0) {
148 			pci_freecfg((struct pci_devinfo *)dinfo);
149 			continue;
150 		}
151 
152 		pci_add_child(dev, (struct pci_devinfo *)dinfo);
153 
154 		/*
155 		 * Some devices don't have an intpin set, but do have
156 		 * interrupts. Add them to the appropriate resource list.
157 		 */
158 		if (dinfo->opd_dinfo.cfg.intpin == 0) {
159 			uint32_t irqs[4];
160 
161 			if (ofw_pci_find_intline(child, irqs) > 0)
162 				resource_list_add(&dinfo->opd_dinfo.resources,
163 				    SYS_RES_IRQ, 0, irqs[0], irqs[0], 1);
164 		}
165 	}
166 
167 	return (bus_generic_attach(dev));
168 }
169 
170 static int
171 ofw_pcibus_assign_interrupt(device_t dev, device_t child)
172 {
173 	uint32_t irqs[4];
174 
175 	device_printf(child,"Assigning interrupt\n");
176 
177 	if (ofw_pci_find_intline(ofw_bus_get_node(child), irqs) < 0)
178 		return PCI_INVALID_IRQ;
179 
180 	device_printf(child,"IRQ %d\n",irqs[0]);
181 
182 	return irqs[0];
183 
184 //	return (PCIB_ROUTE_INTERRUPT(device_get_parent(dev), child, intr));
185 }
186 
187 static const struct ofw_bus_devinfo *
188 ofw_pcibus_get_devinfo(device_t bus, device_t dev)
189 {
190 	struct ofw_pcibus_devinfo *dinfo;
191 
192 	dinfo = device_get_ivars(dev);
193 	return (&dinfo->opd_obdinfo);
194 }
195 
196 static void
197 ofw_pci_fixup_node(device_t dev, phandle_t node)
198 {
199 	uint32_t	csr, intr, irqs[4];
200 	struct		ofw_pci_register addr[8];
201 	int		len, i;
202 
203 	len = OF_getprop(node, "assigned-addresses", addr, sizeof(addr));
204 	if (len < (int)sizeof(struct ofw_pci_register)) {
205 		return;
206 	}
207 
208 	csr = PCIB_READ_CONFIG(dev, OFW_PCI_PHYS_HI_BUS(addr[0].phys_hi),
209 	    OFW_PCI_PHYS_HI_DEVICE(addr[0].phys_hi),
210 	    OFW_PCI_PHYS_HI_FUNCTION(addr[0].phys_hi), PCIR_COMMAND, 4);
211 	csr &= ~(PCIM_CMD_PORTEN | PCIM_CMD_MEMEN);
212 
213 	for (i = 0; i < len / sizeof(struct ofw_pci_register); i++) {
214 		switch (addr[i].phys_hi & OFW_PCI_PHYS_HI_SPACEMASK) {
215 		case OFW_PCI_PHYS_HI_SPACE_IO:
216 			csr |= PCIM_CMD_PORTEN;
217 			break;
218 		case OFW_PCI_PHYS_HI_SPACE_MEM32:
219 			csr |= PCIM_CMD_MEMEN;
220 			break;
221 		}
222 	}
223 
224 	PCIB_WRITE_CONFIG(dev, OFW_PCI_PHYS_HI_BUS(addr[0].phys_hi),
225 	    OFW_PCI_PHYS_HI_DEVICE(addr[0].phys_hi),
226 	    OFW_PCI_PHYS_HI_FUNCTION(addr[0].phys_hi), PCIR_COMMAND, csr, 4);
227 
228 	if (ofw_pci_find_intline(node, irqs) != -1) {
229 		intr = PCIB_READ_CONFIG(dev,
230 		    OFW_PCI_PHYS_HI_BUS(addr[0].phys_hi),
231 		    OFW_PCI_PHYS_HI_DEVICE(addr[0].phys_hi),
232 		    OFW_PCI_PHYS_HI_FUNCTION(addr[0].phys_hi), PCIR_INTLINE, 2);
233 		intr &= ~(0xff);
234 		intr |= irqs[0] & 0xff;
235 		PCIB_WRITE_CONFIG(dev,
236 		    OFW_PCI_PHYS_HI_BUS(addr[0].phys_hi),
237 		    OFW_PCI_PHYS_HI_DEVICE(addr[0].phys_hi),
238 		    OFW_PCI_PHYS_HI_FUNCTION(addr[0].phys_hi), PCIR_INTLINE,
239 		    intr, 2);
240 	}
241 }
242 
243 static int
244 ofw_pci_find_intline(phandle_t node, uint32_t *irqs)
245 {
246 	uint32_t	npintr, paddr[4];
247 	struct		ofw_pci_register addr[8];
248 	int		len;
249 
250 	len = OF_getprop(node, "assigned-addresses", addr, sizeof(addr));
251 	if (len < (int)sizeof(struct ofw_pci_register))
252 		return -1;
253 	/*
254 	 * Create PCI interrupt-map array element. pci-mid/pci-lo
255 	 * aren't required, but the 'interrupts' property needs
256 	 * to be appended
257 	 */
258 	npintr = 0;
259 	OF_getprop(node, "interrupts", &npintr, 4);
260 	paddr[0] = addr[0].phys_hi;
261 	paddr[1] = 0;
262 	paddr[2] = 0;
263 	paddr[3] = npintr;
264 
265 	return find_node_intr(node, paddr, irqs);
266 }
267 
268 static int
269 find_node_intr(phandle_t node, u_int32_t *addr, u_int32_t *intr)
270 {
271 	phandle_t	parent, iparent;
272 	int		len, mlen, match, i;
273 	u_int32_t	map[160], *mp, imask[8], maskedaddr[8], icells;
274 	char		name[32];
275 
276 	len = OF_getprop(node, "AAPL,interrupts", intr, 4);
277 	if (len == 4) {
278 		return (len);
279 	}
280 
281 	parent = OF_parent(node);
282 	len = OF_getprop(parent, "interrupt-map", map, sizeof(map));
283 	mlen = OF_getprop(parent, "interrupt-map-mask", imask, sizeof(imask));
284 
285 	if (len == -1 || mlen == -1)
286 		goto nomap;
287 
288 	memcpy(maskedaddr, addr, mlen);
289 	for (i = 0; i < mlen/4; i++)
290 		maskedaddr[i] &= imask[i];
291 
292 	mp = map;
293 	while (len > mlen) {
294 		match = bcmp(maskedaddr, mp, mlen);
295 		mp += mlen / 4;
296 		len -= mlen;
297 
298 		/*
299 		 * We must read "#interrupt-cells" for each time because
300 		 * interrupt-parent may be different.
301 		 */
302 		iparent = *mp++;
303 		len -= 4;
304 		if (OF_getprop(iparent, "#interrupt-cells", &icells, 4) != 4)
305 			goto nomap;
306 
307 		/* Found. */
308 		if (match == 0) {
309 			bcopy(mp, intr, icells * 4);
310 			return (icells * 4);
311 		}
312 
313 		mp += icells;
314 		len -= icells * 4;
315 	}
316 
317 nomap:
318 	/*
319 	 * Check for local properties indicating interrupts
320 	 */
321 
322 	len = OF_getprop(node, "interrupts", intr, 16);
323 	if (OF_getprop(node, "interrupt-parent", &iparent, sizeof(iparent)) ==
324 	   sizeof(iparent)) {
325 		OF_getprop(iparent, "#interrupt-cells", &icells, sizeof(icells));
326 		for (i = 0; i < len/icells/4; i++)
327 			intr[i] = intr[i*icells];
328 
329 		return (len);
330 	}
331 
332 
333 	/*
334 	 * If the node has no interrupt property and the parent is a PCI
335 	 * bridge, use the parent's interrupt.  This occurs on a PCI slot.
336 	 */
337 	bzero(name, sizeof(name));
338 	OF_getprop(parent, "name", name, sizeof(name));
339 	if (strcmp(name, "pci-bridge") == 0) {
340 		len = OF_getprop(parent, "AAPL,interrupts", intr, 4);
341 		if (len == 4) {
342 			return (len);
343 		}
344 
345 		/*
346 		 * XXX I don't know what is the correct local address.
347 		 * XXX Use the first entry for now.
348 		 */
349 		len = OF_getprop(parent, "interrupt-map", map, sizeof(map));
350 		if (len >= 36) {
351 			addr = &map[5];
352 			/* XXX Use 0 for 'interrupts' for compat */
353 			return (find_node_intr(parent, addr, intr));
354 		}
355 	}
356 
357 	return (-1);
358 }
359 
360