1/*	$NetBSD: bonito_pci.c,v 1.11 2014/03/11 08:19:45 mrg Exp $	*/
2
3/*-
4 * Copyright (c) 2001 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
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, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * PCI configuration space support for the Algorithmics BONITO
34 * MIPS PCI and memory controller.
35 */
36
37#include <sys/cdefs.h>
38__KERNEL_RCSID(0, "$NetBSD: bonito_pci.c,v 1.11 2014/03/11 08:19:45 mrg Exp $");
39
40#include <sys/param.h>
41#include <sys/bus.h>
42#include <sys/device.h>
43#include <sys/intr.h>
44#include <sys/systm.h>
45
46#include <mips/locore.h>
47
48#include <dev/pci/pcireg.h>
49#include <dev/pci/pcivar.h>
50
51#include <mips/bonito/bonitoreg.h>
52#include <mips/bonito/bonitovar.h>
53
54/*
55 * Bonito systems are always single-processor, so this is sufficient.
56 */
57#define	PCI_CONF_LOCK(s)	(s) = splhigh()
58#define	PCI_CONF_UNLOCK(s)	splx((s))
59
60void		bonito_attach_hook(device_t, device_t,
61		    struct pcibus_attach_args *);
62int		bonito_bus_maxdevs(void *, int);
63pcitag_t	bonito_make_tag(void *, int, int, int);
64void		bonito_decompose_tag(void *, pcitag_t, int *, int *, int *);
65pcireg_t	bonito_conf_read(void *, pcitag_t, int);
66void		bonito_conf_write(void *, pcitag_t, int, pcireg_t);
67
68void
69bonito_pci_init(pci_chipset_tag_t pc, const struct bonito_config *bc)
70{
71
72	pc->pc_conf_v = __UNCONST(bc);
73	if (bc->bc_attach_hook != NULL)
74		pc->pc_attach_hook = bc->bc_attach_hook;
75	else
76		pc->pc_attach_hook = bonito_attach_hook;
77	pc->pc_bus_maxdevs = bonito_bus_maxdevs;
78	pc->pc_make_tag = bonito_make_tag;
79	pc->pc_decompose_tag = bonito_decompose_tag;
80	pc->pc_conf_read = bonito_conf_read;
81	pc->pc_conf_write = bonito_conf_write;
82}
83
84void
85bonito_attach_hook(device_t parent, device_t self,
86    struct pcibus_attach_args *pba)
87{
88}
89
90int
91bonito_bus_maxdevs(void *v, int busno)
92{
93
94	return (32);
95}
96
97pcitag_t
98bonito_make_tag(void *v, int b, int d, int f)
99{
100
101	return ((b << 16) | (d << 11) | (f << 8));
102}
103
104void
105bonito_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp, int *fp)
106{
107
108	if (bp != NULL)
109		*bp = (tag >> 16) & 0xff;
110	if (dp != NULL)
111		*dp = (tag >> 11) & 0x1f;
112	if (fp != NULL)
113		*fp = (tag >> 8) & 0x7;
114}
115
116static bool
117bonito_conf_addr(struct bonito_config *bc, pcitag_t tag, int offset,
118    u_int32_t *cfgoff, u_int32_t *pcimap_cfg)
119{
120	int b, d, f;
121
122	if ((unsigned int)offset >= PCI_CONF_SIZE)
123		return true;
124
125	bonito_decompose_tag(bc, tag, &b, &d, &f);
126
127	if (b == 0) {
128		if (d > (31 - bc->bc_adbase))
129			return true;
130		*cfgoff = (1UL << (d + bc->bc_adbase)) | (f << 8) | offset;
131		*pcimap_cfg = 0;
132	} else {
133		*cfgoff = tag | offset;
134		*pcimap_cfg = BONITO_PCIMAPCFG_TYPE1;
135	}
136
137	return false;
138}
139
140pcireg_t
141bonito_conf_read(void *v, pcitag_t tag, int offset)
142{
143	struct bonito_config *bc = v;
144	pcireg_t data;
145	u_int32_t cfgoff, pcimap_cfg;
146	int s;
147
148	if (bonito_conf_addr(bc, tag, offset, &cfgoff, &pcimap_cfg))
149		return ((pcireg_t) -1);
150
151	PCI_CONF_LOCK(s);
152
153	/* clear aborts */
154	REGVAL(BONITO_PCICMD) |=
155	    PCI_STATUS_MASTER_ABORT | PCI_STATUS_MASTER_TARGET_ABORT;
156
157	/* high 16 bits of address go into PciMapCfg register */
158	REGVAL(BONITO_PCIMAP_CFG) = (cfgoff >> 16) | pcimap_cfg;
159
160	wbflush();
161	/* Issue a read to make sure the write is posted */
162	(void)REGVAL(BONITO_PCIMAP_CFG);
163
164	/* low 16 bits of address are offset into config space */
165	data = REGVAL(BONITO_PCICFG_BASE + (cfgoff & 0xfffc));
166
167	/* check for error */
168	if (REGVAL(BONITO_PCICMD) &
169	    (PCI_STATUS_MASTER_ABORT | PCI_STATUS_MASTER_TARGET_ABORT))
170		data = (pcireg_t) -1;
171
172	PCI_CONF_UNLOCK(s);
173
174	return (data);
175}
176
177void
178bonito_conf_write(void *v, pcitag_t tag, int offset, pcireg_t data)
179{
180	struct bonito_config *vt = v;
181	u_int32_t cfgoff, pcimap_cfg;
182	int s;
183
184	if (bonito_conf_addr(vt, tag, offset, &cfgoff, &pcimap_cfg))
185		panic("bonito_conf_write");
186
187	PCI_CONF_LOCK(s);
188
189	/* clear aborts */
190	REGVAL(BONITO_PCICMD) |=
191	    PCI_STATUS_MASTER_ABORT | PCI_STATUS_MASTER_TARGET_ABORT;
192
193	/* high 16 bits of address go into PciMapCfg register */
194	REGVAL(BONITO_PCIMAP_CFG) = (cfgoff >> 16) | pcimap_cfg;
195
196	wbflush();
197	/* Issue a read to make sure the write is posted */
198	(void)REGVAL(BONITO_PCIMAP_CFG);
199
200	/* low 16 bits of address are offset into config space */
201	REGVAL(BONITO_PCICFG_BASE + (cfgoff & 0xfffc)) = data;
202
203	PCI_CONF_UNLOCK(s);
204}
205