grackle.c revision 157895 
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 * $FreeBSD: head/sys/powerpc/powermac/grackle.c 157895 2006-04-20 04:19:10Z imp $
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
37#include <dev/ofw/openfirm.h>
38#include <dev/ofw/ofw_pci.h>
39
40#include <dev/pci/pcivar.h>
41#include <dev/pci/pcireg.h>
42
43#include <machine/bus.h>
44#include <machine/md_var.h>
45#include <machine/nexusvar.h>
46#include <machine/resource.h>
47
48#include <sys/rman.h>
49
50#include <powerpc/ofw/ofw_pci.h>
51#include <powerpc/powermac/gracklevar.h>
52
53#include <vm/vm.h>
54#include <vm/pmap.h>
55
56#include "pcib_if.h"
57
58int      badaddr(void *, size_t);  /* XXX */
59
60/*
61 * Device interface.
62 */
63static int		grackle_probe(device_t);
64static int		grackle_attach(device_t);
65
66/*
67 * Bus interface.
68 */
69static int		grackle_read_ivar(device_t, device_t, int,
70			    uintptr_t *);
71static struct		resource * grackle_alloc_resource(device_t bus,
72			    device_t child, int type, int *rid, u_long start,
73			    u_long end, u_long count, u_int flags);
74static int		grackle_release_resource(device_t bus, device_t child,
75    			    int type, int rid, struct resource *res);
76static int		grackle_activate_resource(device_t bus, device_t child,
77			    int type, int rid, struct resource *res);
78static int		grackle_deactivate_resource(device_t bus,
79    			    device_t child, int type, int rid,
80    			    struct resource *res);
81
82
83/*
84 * pcib interface.
85 */
86static int		grackle_maxslots(device_t);
87static u_int32_t	grackle_read_config(device_t, u_int, u_int, u_int,
88			    u_int, int);
89static void		grackle_write_config(device_t, u_int, u_int, u_int,
90			    u_int, u_int32_t, int);
91static int		grackle_route_interrupt(device_t, device_t, int);
92
93/*
94 * Local routines.
95 */
96static int		grackle_enable_config(struct grackle_softc *, u_int,
97			    u_int, u_int, u_int);
98static void		grackle_disable_config(struct grackle_softc *);
99
100/*
101 * Driver methods.
102 */
103static device_method_t	grackle_methods[] = {
104	/* Device interface */
105	DEVMETHOD(device_probe,		grackle_probe),
106	DEVMETHOD(device_attach,	grackle_attach),
107
108	/* Bus interface */
109	DEVMETHOD(bus_print_child,	bus_generic_print_child),
110	DEVMETHOD(bus_read_ivar,	grackle_read_ivar),
111	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
112	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
113	DEVMETHOD(bus_alloc_resource,	grackle_alloc_resource),
114	DEVMETHOD(bus_release_resource,	grackle_release_resource),
115	DEVMETHOD(bus_activate_resource,	grackle_activate_resource),
116	DEVMETHOD(bus_deactivate_resource,	grackle_deactivate_resource),
117
118	/* pcib interface */
119	DEVMETHOD(pcib_maxslots,	grackle_maxslots),
120	DEVMETHOD(pcib_read_config,	grackle_read_config),
121	DEVMETHOD(pcib_write_config,	grackle_write_config),
122	DEVMETHOD(pcib_route_interrupt,	grackle_route_interrupt),
123
124	{ 0, 0 }
125};
126
127static driver_t	grackle_driver = {
128	"pcib",
129	grackle_methods,
130	sizeof(struct grackle_softc)
131};
132
133static devclass_t	grackle_devclass;
134
135DRIVER_MODULE(grackle, nexus, grackle_driver, grackle_devclass, 0, 0);
136
137static int
138grackle_probe(device_t dev)
139{
140	char	*type, *compatible;
141
142	type = nexus_get_device_type(dev);
143	compatible = nexus_get_compatible(dev);
144
145	if (type == NULL || compatible == NULL)
146		return (ENXIO);
147
148	if (strcmp(type, "pci") != 0 || strcmp(compatible, "grackle") != 0)
149		return (ENXIO);
150
151	device_set_desc(dev, "MPC106 (Grackle) Host-PCI bridge");
152	return (0);
153}
154
155static int
156grackle_attach(device_t dev)
157{
158	struct		grackle_softc *sc;
159	phandle_t	node;
160	u_int32_t	busrange[2];
161	struct		grackle_range *rp, *io, *mem[2];
162	int		nmem, i;
163
164	node = nexus_get_node(dev);
165	sc = device_get_softc(dev);
166
167	if (OF_getprop(node, "bus-range", busrange, sizeof(busrange)) != 8)
168		return (ENXIO);
169
170	sc->sc_dev = dev;
171	sc->sc_node = node;
172	sc->sc_bus = busrange[0];
173
174	/*
175	 * The Grackle PCI config addr/data registers are actually in
176	 * PCI space, but since they are needed to actually probe the
177	 * PCI bus, use the fact that they are also available directly
178	 * on the processor bus and map them
179	 */
180	sc->sc_addr = (vm_offset_t)pmap_mapdev(GRACKLE_ADDR, PAGE_SIZE);
181	sc->sc_data = (vm_offset_t)pmap_mapdev(GRACKLE_DATA, PAGE_SIZE);
182
183	bzero(sc->sc_range, sizeof(sc->sc_range));
184	sc->sc_nrange = OF_getprop(node, "ranges", sc->sc_range,
185	    sizeof(sc->sc_range));
186
187	if (sc->sc_nrange == -1) {
188		device_printf(dev, "could not get ranges\n");
189		return (ENXIO);
190	}
191
192	sc->sc_range[6].pci_hi = 0;
193	io = NULL;
194	nmem = 0;
195
196	for (rp = sc->sc_range; rp->pci_hi != 0; rp++) {
197		switch (rp->pci_hi & OFW_PCI_PHYS_HI_SPACEMASK) {
198		case OFW_PCI_PHYS_HI_SPACE_CONFIG:
199			break;
200		case OFW_PCI_PHYS_HI_SPACE_IO:
201			io = rp;
202			break;
203		case OFW_PCI_PHYS_HI_SPACE_MEM32:
204			mem[nmem] = rp;
205			nmem++;
206			break;
207		case OFW_PCI_PHYS_HI_SPACE_MEM64:
208			break;
209		}
210	}
211
212	if (io == NULL) {
213		device_printf(dev, "can't find io range\n");
214		return (ENXIO);
215	}
216	sc->sc_io_rman.rm_type = RMAN_ARRAY;
217	sc->sc_io_rman.rm_descr = "Grackle PCI I/O Ports";
218	sc->sc_iostart = io->pci_iospace;
219	if (rman_init(&sc->sc_io_rman) != 0 ||
220	    rman_manage_region(&sc->sc_io_rman, io->pci_lo,
221	    io->pci_lo + io->size_lo) != 0) {
222		device_printf(dev, "failed to set up io range management\n");
223		return (ENXIO);
224	}
225
226	if (nmem == 0) {
227		device_printf(dev, "can't find mem ranges\n");
228		return (ENXIO);
229	}
230	sc->sc_mem_rman.rm_type = RMAN_ARRAY;
231	sc->sc_mem_rman.rm_descr = "Grackle PCI Memory";
232	if (rman_init(&sc->sc_mem_rman) != 0) {
233		device_printf(dev,
234		    "failed to init mem range resources\n");
235		return (ENXIO);
236	}
237	for (i = 0; i < nmem; i++) {
238		if (rman_manage_region(&sc->sc_mem_rman, mem[i]->pci_lo,
239		    mem[i]->pci_lo + mem[i]->size_lo) != 0) {
240			device_printf(dev,
241			    "failed to set up memory range management\n");
242			return (ENXIO);
243		}
244	}
245
246	/*
247	 * Write out the correct PIC interrupt values to config space
248	 * of all devices on the bus.
249	 */
250	ofw_pci_fixup(dev, sc->sc_bus, sc->sc_node);
251
252	device_add_child(dev, "pci", device_get_unit(dev));
253	return (bus_generic_attach(dev));
254}
255
256static int
257grackle_maxslots(device_t dev)
258{
259
260	return (PCI_SLOTMAX);
261}
262
263static u_int32_t
264grackle_read_config(device_t dev, u_int bus, u_int slot, u_int func, u_int reg,
265    int width)
266{
267	struct		grackle_softc *sc;
268	vm_offset_t	caoff;
269	u_int32_t	retval = 0xffffffff;
270
271	sc = device_get_softc(dev);
272	caoff = sc->sc_data + (reg & 0x03);
273
274	if (grackle_enable_config(sc, bus, slot, func, reg) != 0) {
275
276		/*
277		 * Config probes to non-existent devices on the
278		 * secondary bus generates machine checks. Be sure
279		 * to catch these.
280		 */
281		if (bus > 0) {
282		  if (badaddr((void *)sc->sc_data, 4)) {
283			  return (retval);
284		  }
285		}
286
287		switch (width) {
288		case 1:
289			retval = (in8rb(caoff));
290			break;
291		case 2:
292			retval = (in16rb(caoff));
293			break;
294		case 4:
295			retval = (in32rb(caoff));
296			break;
297		}
298	}
299	grackle_disable_config(sc);
300
301	return (retval);
302}
303
304static void
305grackle_write_config(device_t dev, u_int bus, u_int slot, u_int func,
306    u_int reg, u_int32_t val, int width)
307{
308	struct		grackle_softc *sc;
309	vm_offset_t	caoff;
310
311	sc = device_get_softc(dev);
312	caoff = sc->sc_data + (reg & 0x03);
313
314	if (grackle_enable_config(sc, bus, slot, func, reg)) {
315		switch (width) {
316		case 1:
317			out8rb(caoff, val);
318			(void)in8rb(caoff);
319			break;
320		case 2:
321			out16rb(caoff, val);
322			(void)in16rb(caoff);
323			break;
324		case 4:
325			out32rb(caoff, val);
326			(void)in32rb(caoff);
327			break;
328		}
329	}
330	grackle_disable_config(sc);
331}
332
333static int
334grackle_route_interrupt(device_t bus, device_t dev, int pin)
335{
336
337	return (0);
338}
339
340static int
341grackle_read_ivar(device_t dev, device_t child, int which, uintptr_t *result)
342{
343	struct	grackle_softc *sc;
344
345	sc = device_get_softc(dev);
346
347	switch (which) {
348	case PCIB_IVAR_BUS:
349		*result = sc->sc_bus;
350		return (0);
351		break;
352	}
353
354	return (ENOENT);
355}
356
357static struct resource *
358grackle_alloc_resource(device_t bus, device_t child, int type, int *rid,
359    u_long start, u_long end, u_long count, u_int flags)
360{
361	struct			grackle_softc *sc;
362	struct			resource *rv;
363	struct			rman *rm;
364	bus_space_tag_t		bt;
365	int			needactivate;
366
367	needactivate = flags & RF_ACTIVE;
368	flags &= ~RF_ACTIVE;
369
370	sc = device_get_softc(bus);
371
372	switch (type) {
373	case SYS_RES_MEMORY:
374		rm = &sc->sc_mem_rman;
375		bt = PPC_BUS_SPACE_MEM;
376		break;
377
378	case SYS_RES_IOPORT:
379		rm = &sc->sc_io_rman;
380		bt = PPC_BUS_SPACE_IO;
381		break;
382
383	case SYS_RES_IRQ:
384		return (bus_alloc_resource(bus, type, rid, start, end, count,
385		    flags));
386		break;
387
388	default:
389		device_printf(bus, "unknown resource request from %s\n",
390		    device_get_nameunit(child));
391		return (NULL);
392	}
393
394	rv = rman_reserve_resource(rm, start, end, count, flags, child);
395	if (rv == NULL) {
396		device_printf(bus, "failed to reserve resource for %s\n",
397		    device_get_nameunit(child));
398		return (NULL);
399	}
400
401	rman_set_rid(rv, *rid);
402	rman_set_bustag(rv, bt);
403	rman_set_bushandle(rv, rman_get_start(rv));
404
405	if (needactivate) {
406		if (bus_activate_resource(child, type, *rid, rv) != 0) {
407			device_printf(bus,
408			    "failed to activate resource for %s\n",
409			    device_get_nameunit(child));
410			rman_release_resource(rv);
411			return (NULL);
412		}
413	}
414
415	return (rv);
416}
417
418static int
419grackle_release_resource(device_t bus, device_t child, int type, int rid,
420    struct resource *res)
421{
422	if (rman_get_flags(res) & RF_ACTIVE) {
423		int error = bus_deactivate_resource(child, type, rid, res);
424		if (error)
425			return error;
426	}
427
428	return (rman_release_resource(res));
429}
430
431static int
432grackle_activate_resource(device_t bus, device_t child, int type, int rid,
433    struct resource *res)
434{
435	struct grackle_softc *sc;
436	void	*p;
437
438	sc = device_get_softc(bus);
439
440	if (type == SYS_RES_IRQ) {
441		return (bus_activate_resource(bus, type, rid, res));
442	}
443	if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) {
444		vm_offset_t start;
445
446		start = (vm_offset_t)rman_get_start(res);
447		/*
448		 * For i/o-ports, convert the start address to the
449		 * MPC106 PCI i/o window
450		 */
451		if (type == SYS_RES_IOPORT)
452			start += sc->sc_iostart;
453
454		if (bootverbose)
455			printf("grackle mapdev: start %x, len %ld\n", start,
456			    rman_get_size(res));
457
458		p = pmap_mapdev(start, (vm_size_t)rman_get_size(res));
459		if (p == NULL)
460			return (ENOMEM);
461
462		rman_set_virtual(res, p);
463		rman_set_bushandle(res, (u_long)p);
464	}
465
466	return (rman_activate_resource(res));
467}
468
469static int
470grackle_deactivate_resource(device_t bus, device_t child, int type, int rid,
471    struct resource *res)
472{
473	/*
474	 * If this is a memory resource, unmap it.
475	 */
476	if ((type == SYS_RES_MEMORY) || (type == SYS_RES_IOPORT)) {
477		u_int32_t psize;
478
479		psize = rman_get_size(res);
480		pmap_unmapdev((vm_offset_t)rman_get_virtual(res), psize);
481	}
482
483	return (rman_deactivate_resource(res));
484}
485
486
487static int
488grackle_enable_config(struct grackle_softc *sc, u_int bus, u_int slot,
489    u_int func, u_int reg)
490{
491	u_int32_t	cfgval;
492
493	/*
494	 * Unlike UniNorth, the format of the config word is the same
495	 * for local (0) and remote busses.
496	 */
497	cfgval = (bus << 16) | (slot << 11) | (func << 8) | (reg & 0xFC)
498	    | GRACKLE_CFG_ENABLE;
499
500	out32rb(sc->sc_addr, cfgval);
501	(void) in32rb(sc->sc_addr);
502
503	return (1);
504}
505
506static void
507grackle_disable_config(struct grackle_softc *sc)
508{
509	/*
510	 * Clear the GRACKLE_CFG_ENABLE bit to prevent stray
511	 * accesses from causing config cycles
512	 */
513	out32rb(sc->sc_addr, 0);
514}
515
516/*
517 * Driver to swallow Grackle host bridges from the PCI bus side.
518 */
519static int
520grackle_hb_probe(device_t dev)
521{
522
523	if (pci_get_devid(dev) == 0x00021057) {
524		device_set_desc(dev, "Grackle Host to PCI bridge");
525		device_quiet(dev);
526		return (0);
527	}
528
529	return (ENXIO);
530}
531
532static int
533grackle_hb_attach(device_t dev)
534{
535
536	return (0);
537}
538
539static device_method_t grackle_hb_methods[] = {
540	/* Device interface */
541	DEVMETHOD(device_probe,         grackle_hb_probe),
542	DEVMETHOD(device_attach,        grackle_hb_attach),
543
544	{ 0, 0 }
545};
546
547static driver_t grackle_hb_driver = {
548	"grackle_hb",
549	grackle_hb_methods,
550	1,
551};
552static devclass_t grackle_hb_devclass;
553
554DRIVER_MODULE(grackle_hb, pci, grackle_hb_driver, grackle_hb_devclass, 0, 0);
555