1/* $NetBSD: pciconf_indirect.c,v 1.7 2021/01/06 08:17:46 rin Exp $ */
2
3/*-
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Tim Rightnour
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 * Generic PowerPC functions for talking to an indirect configuration style
34 * PCI Bridge.
35 */
36
37#include <sys/cdefs.h>
38__KERNEL_RCSID(0, "$NetBSD: pciconf_indirect.c,v 1.7 2021/01/06 08:17:46 rin Exp $");
39
40#define _POWERPC_BUS_DMA_PRIVATE
41
42#include <sys/types.h>
43#include <sys/param.h>
44#include <sys/time.h>
45#include <sys/systm.h>
46#include <sys/errno.h>
47#include <sys/device.h>
48#include <sys/bus.h>
49#include <sys/intr.h>
50
51#include <uvm/uvm_extern.h>
52
53#include <machine/pio.h>
54
55#include <dev/pci/pcivar.h>
56#include <dev/pci/pcireg.h>
57#include <dev/pci/pcidevs.h>
58
59#define	PCI_MODE1_ENABLE	0x80000000UL
60
61void
62genppc_pci_indirect_attach_hook(device_t parent, device_t self,
63    struct pcibus_attach_args *pba)
64{
65
66	if (pba->pba_bus != 0)
67		return;
68
69	printf(": indirect configuration space access");
70}
71
72pcitag_t
73genppc_pci_indirect_make_tag(void *v, int bus, int device, int function)
74{
75	pcitag_t tag;
76
77	if (bus >= 256 || device >= 32 || function >= 8)
78		panic("pci_make_tag: bad request");
79
80	tag = PCI_MODE1_ENABLE |
81		    (bus << 16) | (device << 11) | (function << 8);
82	return tag;
83}
84
85void
86genppc_pci_indirect_decompose_tag(void *v, pcitag_t tag, int *bp, int *dp,
87    int *fp)
88{
89
90	if (bp != NULL)
91		*bp = (tag >> 16) & 0xff;
92	if (dp != NULL)
93		*dp = (tag >> 11) & 0x1f;
94	if (fp != NULL)
95		*fp = (tag >> 8) & 0x7;
96	return;
97}
98
99pcireg_t
100genppc_pci_indirect_conf_read(void *v, pcitag_t tag, int reg)
101{
102	pci_chipset_tag_t pc = (pci_chipset_tag_t)v;
103	pcireg_t data;
104	int s;
105
106	if ((unsigned int)reg >= PCI_CONF_SIZE)
107		return (pcireg_t) -1;
108
109	s = splhigh();
110	out32rb(pc->pc_addr, tag | reg);
111	data = in32rb(pc->pc_data);
112	out32rb(pc->pc_addr, 0);
113	splx(s);
114
115	return data;
116}
117
118void
119genppc_pci_indirect_conf_write(void *v, pcitag_t tag, int reg, pcireg_t data)
120{
121	pci_chipset_tag_t pc = (pci_chipset_tag_t)v;
122	int s;
123
124	if ((unsigned int)reg >= PCI_CONF_SIZE)
125		return;
126
127	s = splhigh();
128	out32rb(pc->pc_addr, tag | reg);
129	out32rb(pc->pc_data, data);
130	out32rb(pc->pc_addr, 0);
131	splx(s);
132}
133