pci_machdep.c revision 1.2 
1/*	NetBSD: pci_machdep.c,v 1.12 2001/06/19 11:56:27 nonaka 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/types.h>
42#include <sys/param.h>
43#include <sys/time.h>
44#include <sys/systm.h>
45#include <sys/errno.h>
46#include <sys/extent.h>
47#include <sys/device.h>
48
49#include <uvm/uvm_extern.h>
50
51#define _POWERPC_BUS_DMA_PRIVATE
52#include <machine/bus.h>
53#include <machine/intr.h>
54
55#include <dev/isa/isavar.h>
56
57#include <dev/pci/pcivar.h>
58#include <dev/pci/pcireg.h>
59#include <dev/pci/pcidevs.h>
60#include <dev/pci/pciconf.h>
61
62/*
63 * PCI doesn't have any special needs; just use the generic versions
64 * of these functions.
65 */
66struct powerpc_bus_dma_tag pci_bus_dma_tag = {
67	0,			/* _bounce_thresh */
68	_bus_dmamap_create,
69	_bus_dmamap_destroy,
70	_bus_dmamap_load,
71	_bus_dmamap_load_mbuf,
72	_bus_dmamap_load_uio,
73	_bus_dmamap_load_raw,
74	_bus_dmamap_unload,
75	NULL,			/* _dmamap_sync */
76	_bus_dmamem_alloc,
77	_bus_dmamem_free,
78	_bus_dmamem_map,
79	_bus_dmamem_unmap,
80	_bus_dmamem_mmap,
81};
82
83int
84ibmnws_pci_bus_maxdevs(void *v, int busno)
85{
86
87	/*
88	 * Bus number is irrelevant.  Configuration Mechanism 1 is in
89	 * use, can have devices 0-32 (i.e. the `normal' range).
90	 */
91	return (32);
92}
93
94
95int
96ibmnws_pci_intr_map(struct pci_attach_args *pa, pci_intr_handle_t *ihp)
97{
98	int pin = pa->pa_intrpin;
99	int line = pa->pa_intrline;
100
101	if (pin == 0) {
102		/* No IRQ used. */
103		goto bad;
104	}
105
106	if (pin > 4) {
107		printf("pci_intr_map: bad interrupt pin %d\n", pin);
108		goto bad;
109	}
110
111	/*
112	* Section 6.2.4, `Miscellaneous Functions', says that 255 means
113	* `unknown' or `no connection' on a PC.  We assume that a device with
114	* `no connection' either doesn't have an interrupt (in which case the
115	* pin number should be 0, and would have been noticed above), or
116	* wasn't configured by the BIOS (in which case we punt, since there's
117	* no real way we can know how the interrupt lines are mapped in the
118	* hardware).
119	*
120	* XXX
121	* Since IRQ 0 is only used by the clock, and we can't actually be sure
122	* that the BIOS did its job, we also recognize that as meaning that
123	* the BIOS has not configured the device.
124	*/
125	if (line == 0 || line == 255) {
126		printf("pci_intr_map: no mapping for pin %c\n", '@' + pin);
127		goto bad;
128	} else {
129		if (line >= ICU_LEN) {
130			printf("pci_intr_map: bad interrupt line %d\n", line);
131			goto bad;
132		}
133		if (line == IRQ_SLAVE) {
134			printf("pci_intr_map: changed line 2 to line 9\n");
135			line = 9;
136		}
137	}
138
139	*ihp = line;
140	return 0;
141
142bad:
143	*ihp = -1;
144	return 1;
145}
146
147const char *
148ibmnws_pci_intr_string(void *v, pci_intr_handle_t ih)
149{
150	static char irqstr[8];		/* 4 + 2 + NULL + sanity */
151
152	if (ih == 0 || ih >= ICU_LEN || ih == IRQ_SLAVE)
153		panic("pci_intr_string: bogus handle 0x%x", ih);
154
155	sprintf(irqstr, "irq %d", ih);
156	return (irqstr);
157
158}
159
160const struct evcnt *
161ibmnws_pci_intr_evcnt(void *v, pci_intr_handle_t ih)
162{
163
164	/* XXX for now, no evcnt parent reported */
165	return NULL;
166}
167
168void *
169ibmnws_pci_intr_establish(void *v, pci_intr_handle_t ih, int level,
170    int (*func)(void *), void *arg)
171{
172
173	if (ih == 0 || ih >= ICU_LEN || ih == IRQ_SLAVE)
174		panic("pci_intr_establish: bogus handle 0x%x", ih);
175
176	return isa_intr_establish(NULL, ih, IST_LEVEL, level, func, arg);
177}
178
179void
180ibmnws_pci_intr_disestablish(void *v, void *cookie)
181{
182
183	isa_intr_disestablish(NULL, cookie);
184}
185
186void
187ibmnws_pci_conf_interrupt(void *v, int bus, int dev, int pin,
188    int swiz, int *iline)
189{
190}
191
192int
193ibmnws_pci_conf_hook(void *v, int bus, int dev, int func, pcireg_t id)
194{
195
196	/*
197	 * The P9100 board found in some IBM machines cannot be
198	 * over-configured.
199	 */
200	if (PCI_VENDOR(id) == PCI_VENDOR_WEITEK &&
201	    PCI_PRODUCT(id) == PCI_PRODUCT_WEITEK_P9100)
202		return 0;
203
204	return (PCI_CONF_DEFAULT);
205}
206