1/*	$NetBSD: prep_pciconf_direct.c,v 1.7 2011/06/18 08:08:29 matt Exp $	*/
2
3/*
4 * Copyright (c) 2002 Klaus J. Klein.  All rights reserved.
5 * Copyright (c) 1996 Christopher G. Demetriou.  All rights reserved.
6 * Copyright (c) 1994 Charles M. Hannum.  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. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by Charles M. Hannum.
19 * 4. The name of the author may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34/*
35 * Machine-specific functions for PCI autoconfiguration.
36 *
37 * This version is specific to the direct-mapped configuration space access
38 * such as implemented on the IBM 27-82650 PCI Bridge/Memory Controller.
39 */
40
41#include <sys/cdefs.h>
42__KERNEL_RCSID(0, "$NetBSD: prep_pciconf_direct.c,v 1.7 2011/06/18 08:08:29 matt Exp $");
43
44#include <sys/types.h>
45#include <sys/param.h>
46#include <sys/time.h>
47#include <sys/systm.h>
48#include <sys/errno.h>
49#include <sys/device.h>
50
51#include <uvm/uvm_extern.h>
52
53#define _POWERPC_BUS_DMA_PRIVATE
54#include <sys/bus.h>
55#include <machine/intr.h>
56#include <machine/platform.h>
57
58#include <powerpc/pio.h>
59
60#include <dev/isa/isavar.h>
61#include <dev/pci/pcivar.h>
62#include <dev/pci/pcireg.h>
63#include <dev/pci/pcidevs.h>
64
65#include <prop/proplib.h>
66
67#ifdef DEBUG
68#define        DPRINTF(x) aprint_debug x
69#else
70#define        DPRINTF(x)
71#endif
72
73/* Physical base address and size of PCI configuration space. */
74#define PCI_DCONF_BASE		0x80800000
75#define	PCI_DCONF_SIZE		0x00800000
76/* Device function selection. */
77#define	PCI_DCONF_FUNC		0x00000700
78#define	PCI_DCONF_FUNC_SHIFT	8
79/* Configuration space register selection. */
80#define	PCI_DCONF_REG		0x000000ff
81#define	PCI_DCONF_REG_SHIFT	0
82/* Device selection; those bits still available. */
83#define	PCI_DCONF_DEV  \
84    (~(~(PCI_DCONF_SIZE - 1) | PCI_DCONF_FUNC | PCI_DCONF_REG))
85
86void prep_pci_direct_attach_hook(device_t, device_t,
87    struct pcibus_attach_args *);
88pcitag_t prep_pci_direct_make_tag(void *, int, int, int);
89pcireg_t prep_pci_direct_conf_read(void *, pcitag_t, int);
90void prep_pci_direct_conf_write(void *, pcitag_t, int, pcireg_t);
91void prep_pci_direct_decompose_tag(void *, pcitag_t, int *, int *, int *);
92
93void
94prep_pci_get_chipset_tag_direct(pci_chipset_tag_t pc)
95{
96
97	pc->pc_conf_v = NULL;
98
99	pc->pc_attach_hook = prep_pci_direct_attach_hook;
100	pc->pc_bus_maxdevs = prep_pci_bus_maxdevs;
101	pc->pc_make_tag = prep_pci_direct_make_tag;
102	pc->pc_conf_read = prep_pci_direct_conf_read;
103	pc->pc_conf_write = prep_pci_direct_conf_write;
104
105	pc->pc_intr_v = NULL;
106
107	pc->pc_intr_map = prep_pci_intr_map;
108	pc->pc_intr_string = genppc_pci_intr_string;
109	pc->pc_intr_evcnt = genppc_pci_intr_evcnt;
110	pc->pc_intr_establish = genppc_pci_intr_establish;
111	pc->pc_intr_disestablish = genppc_pci_intr_disestablish;
112
113	pc->pc_conf_interrupt = genppc_pci_conf_interrupt;
114	pc->pc_decompose_tag = prep_pci_direct_decompose_tag;
115	pc->pc_conf_hook = prep_pci_conf_hook;
116}
117
118void
119prep_pci_direct_attach_hook(device_t parent, device_t self,
120    struct pcibus_attach_args *pba)
121{
122
123	if (pba->pba_bus == 0)
124		aprint_normal(": direct-mapped configuration space access");
125}
126
127pcitag_t
128prep_pci_direct_make_tag(void *v, int bus, int device, int function)
129{
130	pcitag_t tag;
131
132	if (bus >= 256 || device >= 32 || function >= 8)
133		panic("prep_pci_direct_make_tag: bad request");
134
135	tag = (bus << 16) | (device << 11) | (function << 8);
136
137	return tag;
138}
139
140void
141prep_pci_direct_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp,
142    int *fp)
143{
144
145	if (bp != NULL)
146		*bp = (tag >> 16) & 0xff;
147	if (dp != NULL)
148		*dp = (tag >> 11) & 0x1f;
149	if (fp != NULL)
150		*fp = (tag >> 8) & 0x7;
151	return;
152}
153
154pcireg_t
155prep_pci_direct_conf_read(void *v, pcitag_t tag, int reg)
156{
157	pcireg_t data;
158	int bus, device, function;
159	int s;
160
161	prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function);
162
163	if (bus == 0) {
164		/* Check if device selector is within selector range. */
165		if (1 << device & ~PCI_DCONF_DEV) {
166			data = ~0;
167			goto out;
168		}
169		tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT);
170	}
171
172	s = splhigh();
173	data = in32rb(PCI_DCONF_BASE | tag | reg);
174	splx(s);
175
176out:
177	return data;
178}
179
180void
181prep_pci_direct_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data)
182{
183	int bus, device, function;
184	int s;
185
186	DPRINTF(("prep_pci_direct_conf_write(0x%lx, 0x%x, 0x%02x, 0x%08lx) ",
187	    (unsigned long)v, tag, reg, (unsigned long)data));
188
189	prep_pci_direct_decompose_tag(v, tag, &bus, &device, &function);
190
191	if (bus == 0) {
192		/* Check if device selector is within selector range. */
193		if (1 << device & ~PCI_DCONF_DEV) {
194			/* Should never happen. */
195			panic("prep_pci_direct_conf_write: bad device %d",
196			    device);
197		}
198		tag = (1 << device) | (function << PCI_DCONF_FUNC_SHIFT);
199	}
200
201	s = splhigh();
202	out32rb(PCI_DCONF_BASE | tag | reg, data);
203	splx(s);
204}
205