apb.c revision 206019 
1/*-
2 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
3 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
4 * Copyright (c) 2000 BSDi
5 * Copyright (c) 2001, 2003 Thomas Moestl <tmm@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 *    derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 *	from: FreeBSD: src/sys/dev/pci/pci_pci.c,v 1.3 2000/12/13
32 */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/sys/sparc64/pci/apb.c 206019 2010-03-31 22:27:33Z marius $");
36
37/*
38 * Support for the Sun APB (Advanced PCI Bridge) PCI-PCI bridge.
39 * This bridge does not fully comply to the PCI bridge specification, and is
40 * therefore not supported by the generic driver.
41 * We can use some of the pcib methods anyway.
42 */
43
44#include "opt_ofw_pci.h"
45
46#include <sys/param.h>
47#include <sys/systm.h>
48#include <sys/kernel.h>
49#include <sys/module.h>
50#include <sys/bus.h>
51
52#include <dev/ofw/ofw_bus.h>
53#include <dev/ofw/openfirm.h>
54
55#include <machine/bus.h>
56#include <machine/resource.h>
57
58#include <dev/pci/pcireg.h>
59#include <dev/pci/pcivar.h>
60#include <dev/pci/pcib_private.h>
61
62#include "pcib_if.h"
63
64#include <sparc64/pci/ofw_pci.h>
65#include <sparc64/pci/ofw_pcib_subr.h>
66
67/*
68 * Bridge-specific data.
69 */
70struct apb_softc {
71	struct ofw_pcib_gen_softc	sc_bsc;
72	uint8_t		sc_iomap;
73	uint8_t		sc_memmap;
74};
75
76static device_probe_t apb_probe;
77static device_attach_t apb_attach;
78static bus_alloc_resource_t apb_alloc_resource;
79
80static device_method_t apb_methods[] = {
81	/* Device interface */
82	DEVMETHOD(device_probe,		apb_probe),
83	DEVMETHOD(device_attach,	apb_attach),
84	DEVMETHOD(device_shutdown,	bus_generic_shutdown),
85	DEVMETHOD(device_suspend,	bus_generic_suspend),
86	DEVMETHOD(device_resume,	bus_generic_resume),
87
88	/* Bus interface */
89	DEVMETHOD(bus_print_child,	bus_generic_print_child),
90	DEVMETHOD(bus_read_ivar,	pcib_read_ivar),
91	DEVMETHOD(bus_write_ivar,	pcib_write_ivar),
92	DEVMETHOD(bus_alloc_resource,	apb_alloc_resource),
93	DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
94	DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
95	DEVMETHOD(bus_release_resource,	bus_generic_release_resource),
96	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
97	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
98
99	/* pcib interface */
100	DEVMETHOD(pcib_maxslots,	pcib_maxslots),
101	DEVMETHOD(pcib_read_config,	pcib_read_config),
102	DEVMETHOD(pcib_write_config,	pcib_write_config),
103	DEVMETHOD(pcib_route_interrupt,	ofw_pcib_gen_route_interrupt),
104
105	/* ofw_bus interface */
106	DEVMETHOD(ofw_bus_get_node,	ofw_pcib_gen_get_node),
107
108	KOBJMETHOD_END
109};
110
111static devclass_t pcib_devclass;
112
113DEFINE_CLASS_0(pcib, apb_driver, apb_methods, sizeof(struct apb_softc));
114EARLY_DRIVER_MODULE(apb, pci, apb_driver, pcib_devclass, 0, 0, BUS_PASS_BUS);
115MODULE_DEPEND(apb, pci, 1, 1, 1);
116
117/* APB specific registers */
118#define	APBR_IOMAP	0xde
119#define	APBR_MEMMAP	0xdf
120
121/* Definitions for the mapping registers */
122#define	APB_IO_SCALE	0x200000
123#define	APB_MEM_SCALE	0x20000000
124
125/*
126 * Generic device interface
127 */
128static int
129apb_probe(device_t dev)
130{
131
132	if (pci_get_vendor(dev) == 0x108e &&	/* Sun */
133	    pci_get_device(dev) == 0x5000)  {	/* APB */
134		device_set_desc(dev, "APB PCI-PCI bridge");
135		return (0);
136	}
137	return (ENXIO);
138}
139
140static void
141apb_map_print(uint8_t map, u_long scale)
142{
143	int i, first;
144
145	for (first = 1, i = 0; i < 8; i++) {
146		if ((map & (1 << i)) != 0) {
147			printf("%s0x%lx-0x%lx", first ? "" : ", ",
148			    i * scale, (i + 1) * scale - 1);
149			first = 0;
150		}
151	}
152}
153
154static int
155apb_checkrange(uint8_t map, u_long scale, u_long start, u_long end)
156{
157	int i, ei;
158
159	i = start / scale;
160	ei = end / scale;
161	if (i > 7 || ei > 7)
162		return (0);
163	for (; i <= ei; i++)
164		if ((map & (1 << i)) == 0)
165			return (0);
166	return (1);
167}
168
169static int
170apb_attach(device_t dev)
171{
172	struct apb_softc *sc;
173
174	sc = device_get_softc(dev);
175
176	/*
177	 * Get current bridge configuration.
178	 */
179	sc->sc_bsc.ops_pcib_sc.domain = pci_get_domain(dev);
180	sc->sc_bsc.ops_pcib_sc.secbus =
181	    pci_read_config(dev, PCIR_SECBUS_1, 1);
182	sc->sc_bsc.ops_pcib_sc.subbus =
183	    pci_read_config(dev, PCIR_SUBBUS_1, 1);
184	sc->sc_iomap = pci_read_config(dev, APBR_IOMAP, 1);
185	sc->sc_memmap = pci_read_config(dev, APBR_MEMMAP, 1);
186	ofw_pcib_gen_setup(dev);
187
188	if (bootverbose) {
189		device_printf(dev, "  domain            %d\n",
190		    sc->sc_bsc.ops_pcib_sc.domain);
191		device_printf(dev, "  secondary bus     %d\n",
192		    sc->sc_bsc.ops_pcib_sc.secbus);
193		device_printf(dev, "  subordinate bus   %d\n",
194		    sc->sc_bsc.ops_pcib_sc.subbus);
195		device_printf(dev, "  I/O decode        ");
196		apb_map_print(sc->sc_iomap, APB_IO_SCALE);
197		printf("\n");
198		device_printf(dev, "  memory decode     ");
199		apb_map_print(sc->sc_memmap, APB_MEM_SCALE);
200		printf("\n");
201	}
202
203	device_add_child(dev, "pci", -1);
204	return (bus_generic_attach(dev));
205}
206
207/*
208 * We have to trap resource allocation requests and ensure that the bridge
209 * is set up to, or capable of handling them.
210 */
211static struct resource *
212apb_alloc_resource(device_t dev, device_t child, int type, int *rid,
213    u_long start, u_long end, u_long count, u_int flags)
214{
215	struct apb_softc *sc;
216
217	sc = device_get_softc(dev);
218
219	/*
220	 * If this is a "default" allocation against this rid, we can't work
221	 * out where it's coming from (we should actually never see these) so
222	 * we just have to punt.
223	 */
224	if (start == 0 && end == ~0) {
225		device_printf(dev, "can't decode default resource id %d for "
226		    "%s, bypassing\n", *rid, device_get_nameunit(child));
227		goto passup;
228	}
229
230	/*
231	 * Fail the allocation for this range if it's not supported.
232	 * XXX we should probably just fix up the bridge decode and
233	 * soldier on.
234	 */
235	switch (type) {
236	case SYS_RES_IOPORT:
237		if (!apb_checkrange(sc->sc_iomap, APB_IO_SCALE, start, end)) {
238			device_printf(dev, "device %s requested unsupported "
239			    "I/O range 0x%lx-0x%lx\n",
240			    device_get_nameunit(child), start, end);
241			return (NULL);
242		}
243		if (bootverbose)
244			device_printf(sc->sc_bsc.ops_pcib_sc.dev, "device "
245			    "%s requested decoded I/O range 0x%lx-0x%lx\n",
246			    device_get_nameunit(child), start, end);
247		break;
248
249	case SYS_RES_MEMORY:
250		if (!apb_checkrange(sc->sc_memmap, APB_MEM_SCALE, start, end)) {
251			device_printf(dev, "device %s requested unsupported "
252			    "memory range 0x%lx-0x%lx\n",
253			    device_get_nameunit(child), start, end);
254			return (NULL);
255		}
256		if (bootverbose)
257			device_printf(sc->sc_bsc.ops_pcib_sc.dev, "device "
258			    "%s requested decoded memory range 0x%lx-0x%lx\n",
259			    device_get_nameunit(child), start, end);
260		break;
261
262	default:
263		break;
264	}
265
266 passup:
267	/*
268	 * Bridge is OK decoding this resource, so pass it up.
269	 */
270	return (bus_generic_alloc_resource(dev, child, type, rid, start, end,
271	    count, flags));
272}
273