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
61 void
genppc_pci_indirect_attach_hook(device_t parent,device_t self,struct pcibus_attach_args * pba)62 genppc_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
72 pcitag_t
genppc_pci_indirect_make_tag(void * v,int bus,int device,int function)73 genppc_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
85 void
genppc_pci_indirect_decompose_tag(void * v,pcitag_t tag,int * bp,int * dp,int * fp)86 genppc_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
99 pcireg_t
genppc_pci_indirect_conf_read(void * v,pcitag_t tag,int reg)100 genppc_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
118 void
genppc_pci_indirect_conf_write(void * v,pcitag_t tag,int reg,pcireg_t data)119 genppc_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