1 /*-
2 * Copyright (c) 2015 Ian Lepore <ian@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * The initial ofw_reg_to_paddr() implementation has been copied from powerpc
27 * ofw_machdep.c OF_decode_addr(). It was added by Marcel Moolenaar, who did not
28 * assert copyright with the addition but still deserves credit for the work.
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <sys/bus.h>
36 #include <sys/libkern.h>
37
38 #include <machine/bus.h>
39
40 #include <dev/ofw/openfirm.h>
41 #include <dev/ofw/ofw_pci.h>
42 #include <dev/ofw/ofw_subr.h>
43
44 static void
get_addr_props(phandle_t node,uint32_t * addrp,uint32_t * sizep,int * pcip)45 get_addr_props(phandle_t node, uint32_t *addrp, uint32_t *sizep, int *pcip)
46 {
47 char type[64];
48 uint32_t addr, size;
49 int pci, res;
50
51 res = OF_getencprop(node, "#address-cells", &addr, sizeof(addr));
52 if (res == -1)
53 addr = 2;
54 res = OF_getencprop(node, "#size-cells", &size, sizeof(size));
55 if (res == -1)
56 size = 1;
57 pci = 0;
58 if (addr == 3 && size == 2) {
59 res = OF_getprop(node, "device_type", type, sizeof(type));
60 if (res != -1) {
61 type[sizeof(type) - 1] = '\0';
62 pci = (strcmp(type, "pci") == 0) ? 1 : 0;
63 }
64 }
65 if (addrp != NULL)
66 *addrp = addr;
67 if (sizep != NULL)
68 *sizep = size;
69 if (pcip != NULL)
70 *pcip = pci;
71 }
72
73 int
ofw_reg_to_paddr(phandle_t dev,int regno,bus_addr_t * paddr,bus_size_t * psize,pcell_t * ppci_hi)74 ofw_reg_to_paddr(phandle_t dev, int regno, bus_addr_t *paddr,
75 bus_size_t *psize, pcell_t *ppci_hi)
76 {
77 pcell_t cell[32], pci_hi;
78 bus_addr_t addr, raddr, baddr;
79 bus_size_t size, rsize;
80 uint32_t c, nbridge, naddr, nsize;
81 phandle_t bridge, parent;
82 u_int spc, rspc;
83 int pci, pcib, res;
84
85 /* Sanity checking. */
86 if (dev == 0)
87 return (EINVAL);
88 bridge = OF_parent(dev);
89 if (bridge == 0)
90 return (EINVAL);
91 if (regno < 0)
92 return (EINVAL);
93 if (paddr == NULL || psize == NULL)
94 return (EINVAL);
95
96 get_addr_props(bridge, &naddr, &nsize, &pci);
97 res = OF_getencprop(dev, (pci) ? "assigned-addresses" : "reg",
98 cell, sizeof(cell));
99 if (res == -1)
100 return (ENXIO);
101 if (res % sizeof(cell[0]))
102 return (ENXIO);
103 res /= sizeof(cell[0]);
104 regno *= naddr + nsize;
105 if (regno + naddr + nsize > res)
106 return (EINVAL);
107 pci_hi = pci ? cell[regno] : OFW_PADDR_NOT_PCI;
108 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK;
109 addr = 0;
110 for (c = 0; c < naddr; c++)
111 addr = ((uint64_t)addr << 32) | cell[regno++];
112 size = 0;
113 for (c = 0; c < nsize; c++)
114 size = ((uint64_t)size << 32) | cell[regno++];
115 /*
116 * Map the address range in the bridge's decoding window as given
117 * by the "ranges" property. If a node doesn't have such property
118 * or the property is empty, we assume an identity mapping. The
119 * standard says a missing property indicates no possible mapping.
120 * This code is more liberal since the intended use is to get a
121 * console running early, and a printf to warn of malformed data
122 * is probably futile before the console is fully set up.
123 */
124 parent = OF_parent(bridge);
125 while (parent != 0) {
126 get_addr_props(parent, &nbridge, NULL, &pcib);
127 res = OF_getencprop(bridge, "ranges", cell, sizeof(cell));
128 if (res < 1)
129 goto next;
130 if (res % sizeof(cell[0]))
131 return (ENXIO);
132 /* Capture pci_hi if we just transitioned onto a PCI bus. */
133 if (pcib && pci_hi == OFW_PADDR_NOT_PCI) {
134 pci_hi = cell[0];
135 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK;
136 }
137 res /= sizeof(cell[0]);
138 regno = 0;
139 while (regno < res) {
140 rspc = (pci ? cell[regno] : OFW_PADDR_NOT_PCI) &
141 OFW_PCI_PHYS_HI_SPACEMASK;
142 if (rspc != spc) {
143 regno += naddr + nbridge + nsize;
144 continue;
145 }
146 raddr = 0;
147 for (c = 0; c < naddr; c++)
148 raddr = ((uint64_t)raddr << 32) | cell[regno++];
149 rspc = (pcib)
150 ? cell[regno] & OFW_PCI_PHYS_HI_SPACEMASK
151 : OFW_PADDR_NOT_PCI;
152 baddr = 0;
153 for (c = 0; c < nbridge; c++)
154 baddr = ((uint64_t)baddr << 32) | cell[regno++];
155 rsize = 0;
156 for (c = 0; c < nsize; c++)
157 rsize = ((uint64_t)rsize << 32) | cell[regno++];
158 if (addr < raddr || addr >= raddr + rsize)
159 continue;
160 addr = addr - raddr + baddr;
161 if (rspc != OFW_PADDR_NOT_PCI)
162 spc = rspc;
163 }
164 next:
165 bridge = parent;
166 parent = OF_parent(bridge);
167 get_addr_props(bridge, &naddr, &nsize, &pci);
168 }
169
170 *paddr = addr;
171 *psize = size;
172 if (ppci_hi != NULL)
173 *ppci_hi = pci_hi;
174
175 return (0);
176 }
177