1/* $NetBSD: apecs_pci.c,v 1.24 2011/06/14 15:34:22 matt Exp $ */
2
3/*
4 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
22 *  School of Computer Science
23 *  Carnegie Mellon University
24 *  Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
31
32__KERNEL_RCSID(0, "$NetBSD: apecs_pci.c,v 1.24 2011/06/14 15:34:22 matt Exp $");
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/kernel.h>
37#include <sys/device.h>
38
39#include <dev/pci/pcireg.h>
40#include <dev/pci/pcivar.h>
41#include <alpha/pci/apecsreg.h>
42#include <alpha/pci/apecsvar.h>
43
44void		apecs_attach_hook(device_t, device_t,
45		    struct pcibus_attach_args *);
46int		apecs_bus_maxdevs(void *, int);
47pcitag_t	apecs_make_tag(void *, int, int, int);
48void		apecs_decompose_tag(void *, pcitag_t, int *, int *, int *);
49pcireg_t	apecs_conf_read(void *, pcitag_t, int);
50void		apecs_conf_write(void *, pcitag_t, int, pcireg_t);
51
52void
53apecs_pci_init(pci_chipset_tag_t pc, void *v)
54{
55
56	pc->pc_conf_v = v;
57	pc->pc_attach_hook = apecs_attach_hook;
58	pc->pc_bus_maxdevs = apecs_bus_maxdevs;
59	pc->pc_make_tag = apecs_make_tag;
60	pc->pc_decompose_tag = apecs_decompose_tag;
61	pc->pc_conf_read = apecs_conf_read;
62	pc->pc_conf_write = apecs_conf_write;
63}
64
65void
66apecs_attach_hook(device_t parent, device_t self, struct pcibus_attach_args *pba)
67{
68}
69
70int
71apecs_bus_maxdevs(void *cpv, int busno)
72{
73
74	return 32;
75}
76
77pcitag_t
78apecs_make_tag(void *cpv, int b, int d, int f)
79{
80
81	return (b << 16) | (d << 11) | (f << 8);
82}
83
84void
85apecs_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp)
86{
87
88	if (bp != NULL)
89		*bp = (tag >> 16) & 0xff;
90	if (dp != NULL)
91		*dp = (tag >> 11) & 0x1f;
92	if (fp != NULL)
93		*fp = (tag >> 8) & 0x7;
94}
95
96pcireg_t
97apecs_conf_read(void *cpv, pcitag_t tag, int offset)
98{
99	struct apecs_config *acp = cpv;
100	pcireg_t *datap, data;
101	int s, secondary, ba;
102	int32_t old_haxr2;					/* XXX */
103
104	s = 0;					/* XXX gcc -Wuninitialized */
105	old_haxr2 = 0;				/* XXX gcc -Wuninitialized */
106
107	/* secondary if bus # != 0 */
108	pci_decompose_tag(&acp->ac_pc, tag, &secondary, 0, 0);
109	if (secondary) {
110		s = splhigh();
111		old_haxr2 = REGVAL(EPIC_HAXR2);
112		alpha_mb();
113		REGVAL(EPIC_HAXR2) = old_haxr2 | 0x1;
114		alpha_mb();
115	}
116
117	datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(APECS_PCI_CONF |
118	    tag << 5UL |					/* XXX */
119	    (offset & ~0x03) << 5 |				/* XXX */
120	    0 << 5 |						/* XXX */
121	    0x3 << 3);						/* XXX */
122	data = (pcireg_t)-1;
123	if (!(ba = badaddr(datap, sizeof *datap)))
124		data = *datap;
125
126	if (secondary) {
127		alpha_mb();
128		REGVAL(EPIC_HAXR2) = old_haxr2;
129		alpha_mb();
130		splx(s);
131	}
132
133#if 0
134	printf("apecs_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
135	    data, datap, ba ? " (badaddr)" : "");
136#endif
137
138	return data;
139}
140
141void
142apecs_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
143{
144	struct apecs_config *acp = cpv;
145	pcireg_t *datap;
146	int s, secondary;
147	int32_t old_haxr2;					/* XXX */
148
149	s = 0;					/* XXX gcc -Wuninitialized */
150	old_haxr2 = 0;				/* XXX gcc -Wuninitialized */
151
152	/* secondary if bus # != 0 */
153	pci_decompose_tag(&acp->ac_pc, tag, &secondary, 0, 0);
154	if (secondary) {
155		s = splhigh();
156		old_haxr2 = REGVAL(EPIC_HAXR2);
157		alpha_mb();
158		REGVAL(EPIC_HAXR2) = old_haxr2 | 0x1;
159		alpha_mb();
160	}
161
162	datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(APECS_PCI_CONF |
163	    tag << 5UL |					/* XXX */
164	    (offset & ~0x03) << 5 |				/* XXX */
165	    0 << 5 |						/* XXX */
166	    0x3 << 3);						/* XXX */
167
168	alpha_mb();
169	*datap = data;
170	alpha_mb();
171	alpha_mb();
172
173	if (secondary) {
174		alpha_mb();
175		REGVAL(EPIC_HAXR2) = old_haxr2;
176		alpha_mb();
177		splx(s);
178	}
179
180#if 0
181	printf("apecs_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
182	    reg, data, datap);
183#endif
184}
185