1 /* $NetBSD: rbus_machdep.c,v 1.27 2017/08/15 09:25:00 maxv Exp $ */
2
3 /*
4 * Copyright (c) 1999
5 * HAYAKAWA Koichi. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __KERNEL_RCSID(0, "$NetBSD: rbus_machdep.c,v 1.27 2017/08/15 09:25:00 maxv Exp $");
30
31 #include "opt_pcibios.h"
32 #include "opt_pcifixup.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/extent.h>
37
38 #include <sys/sysctl.h>
39
40 #include <sys/bus.h>
41 #include <dev/cardbus/rbus.h>
42
43 #include <sys/device.h>
44 #include <dev/isa/isareg.h>
45 #include <dev/isa/isavar.h>
46
47 #include <dev/pci/pcivar.h>
48 #if defined(PCI_ADDR_FIXUP)
49 #include <arch/x86/pci/pci_addr_fixup.h>
50 #endif
51
52 #ifndef RBUS_IO_BASE
53 #define RBUS_IO_BASE 0x4000
54 #endif
55 #ifndef RBUS_IO_SIZE
56 #define RBUS_IO_SIZE 0x2000
57 #endif
58
59 #ifndef RBUS_MIN_START
60 #define RBUS_MIN_START 0x40000000 /* 1GB */
61 #else
62 /*
63 * Note that kernel config forced RBUS_MIN_START.
64 */
65 #define RBUS_MIN_START_FORCED
66 #endif
67 bus_addr_t rbus_min_start = RBUS_MIN_START;
68
69 /*
70 * Dynamically set the start address for rbus. This must be called
71 * before rbus is initialized. The start address should be determined
72 * by the amount of installed memory. Generally 1 GB has been found
73 * to be a good value, but it fails on some Thinkpads (e.g. 2645-4AU),
74 * for which 0.5 GB is a good value. It also fails on (at least)
75 * Thinkpads with 2GB of RAM, for which 2 GB is a good value.
76 *
77 * Thus, a general strategy of setting rbus_min_start to the amount of
78 * memory seems in order. However, the actually amount of memory is
79 * generally slightly more than the amount found, e.g. 1014MB vs 1024,
80 * or 2046 vs 2048.
81 */
82 void
rbus_min_start_hint(psize_t ram)83 rbus_min_start_hint(psize_t ram)
84 {
85 #ifdef RBUS_MIN_START_FORCED
86 aprint_debug("rbus: rbus_min_start from config at %#0" PRIxPADDR "\n",
87 rbus_min_start);
88 #else
89 if (ram <= 192*1024*1024UL) {
90 /*
91 * <= 192 MB, so try 0.5 GB. This will work on
92 * Thinkpad 600E (2645-4AU), which fails at 1GB, and
93 * on some other older machines that may have trouble
94 * with addresses needing more than 20 bits.
95 */
96 rbus_min_start = 512 * 1024 * 1024UL;
97 }
98
99 if (ram >= 1024*1024*1024UL) {
100 /*
101 * > 1GB, so try 2 GB.
102 */
103 rbus_min_start = 2 * 1024 * 1024 * 1024UL;
104 }
105
106 /* XXX Not tested in > 2 GB case. */
107 if (ram > 2 * 1024*1024*1024UL) {
108 /*
109 * > 2 GB, so try 3 GB.
110 */
111 rbus_min_start = 3 * 1024 * 1024 * 1024UL;
112 }
113
114 aprint_debug("rbus: rbus_min_start set to %#0" PRIxPADDR "\n",
115 rbus_min_start);
116 #endif
117 }
118
119
120 /*
121 * rbus_tag_t rbus_fakeparent_mem(struct pci_attach_args *pa)
122 *
123 * This function makes an rbus tag for memory space. This rbus tag
124 * shares the all memory region of ex_iomem.
125 */
126 rbus_tag_t
rbus_pccbb_parent_mem(struct pci_attach_args * pa)127 rbus_pccbb_parent_mem(struct pci_attach_args *pa)
128 {
129 bus_addr_t start;
130 bus_size_t size;
131 extern struct extent *iomem_ex;
132 struct extent *ex = iomem_ex;
133
134 #if defined(PCI_ADDR_FIXUP)
135 if (pciaddr.extent_mem != NULL)
136 ex = pciaddr.extent_mem;
137 #endif
138
139 start = ex->ex_start;
140
141 /*
142 * XXX: unfortunately, iomem_ex cannot be used for the dynamic
143 * bus_space allocation. There are some hidden memory (or
144 * some obstacles which are not recognised by the kernel) in
145 * the region governed by iomem_ex. So I decide to use only
146 * very high address region.
147 *
148 * If pcibios_addr_fixup() succeeded, the PCI device is using an area
149 * which is not recognised by the kernel as already reserved.
150 */
151
152 if (start < rbus_min_start)
153 start = rbus_min_start;
154
155 size = ex->ex_end - start;
156
157 return rbus_new_root_share(pa->pa_memt, ex, start, size, 0);
158 }
159
160
161 /*
162 * rbus_tag_t rbus_pccbb_parent_io(struct pci_attach_args *pa)
163 */
164 rbus_tag_t
rbus_pccbb_parent_io(struct pci_attach_args * pa)165 rbus_pccbb_parent_io(struct pci_attach_args *pa)
166 {
167 bus_addr_t start;
168 bus_size_t size;
169 rbus_tag_t ret;
170 extern struct extent *ioport_ex;
171 struct extent *ex = ioport_ex;
172
173 #if defined(PCI_ADDR_FIXUP)
174 if (pciaddr.extent_port != NULL)
175 ex = pciaddr.extent_port;
176 #endif
177
178 start = RBUS_IO_BASE;
179 size = RBUS_IO_SIZE;
180
181 ret = rbus_new_root_share(pa->pa_iot, ex, start, size, 0);
182 if (ret == NULL)
183 panic("failed to alloc I/O space");
184
185 return ret;
186 }
187