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 #include <sys/rman.h>
38
39 #include <machine/bus.h>
40
41 #include <dev/ofw/openfirm.h>
42 #include <dev/ofw/ofw_pci.h>
43 #include <dev/ofw/ofw_subr.h>
44
45 static void
get_addr_props(phandle_t node,uint32_t * addrp,uint32_t * sizep,int * pcip)46 get_addr_props(phandle_t node, uint32_t *addrp, uint32_t *sizep, int *pcip)
47 {
48 char type[64];
49 uint32_t addr, size;
50 int pci, res;
51
52 res = OF_getencprop(node, "#address-cells", &addr, sizeof(addr));
53 if (res == -1)
54 addr = 2;
55 res = OF_getencprop(node, "#size-cells", &size, sizeof(size));
56 if (res == -1)
57 size = 1;
58 pci = 0;
59 if (addr == 3 && size == 2) {
60 res = OF_getprop(node, "device_type", type, sizeof(type));
61 if (res != -1) {
62 type[sizeof(type) - 1] = '\0';
63 pci = (strcmp(type, "pci") == 0) ? 1 : 0;
64 }
65 }
66 if (addrp != NULL)
67 *addrp = addr;
68 if (sizep != NULL)
69 *sizep = size;
70 if (pcip != NULL)
71 *pcip = pci;
72 }
73
74 int
ofw_reg_to_paddr(phandle_t dev,int regno,bus_addr_t * paddr,bus_size_t * psize,pcell_t * ppci_hi)75 ofw_reg_to_paddr(phandle_t dev, int regno, bus_addr_t *paddr,
76 bus_size_t *psize, pcell_t *ppci_hi)
77 {
78 pcell_t cell[32], pci_hi;
79 uint64_t addr, raddr, baddr;
80 uint64_t size, rsize;
81 uint32_t c, nbridge, naddr, nsize;
82 phandle_t bridge, parent;
83 u_int spc, rspc;
84 int pci, pcib, res;
85
86 /* Sanity checking. */
87 if (dev == 0)
88 return (EINVAL);
89 bridge = OF_parent(dev);
90 if (bridge == 0)
91 return (EINVAL);
92 if (regno < 0)
93 return (EINVAL);
94 if (paddr == NULL || psize == NULL)
95 return (EINVAL);
96
97 get_addr_props(bridge, &naddr, &nsize, &pci);
98 res = OF_getencprop(dev, (pci) ? "assigned-addresses" : "reg",
99 cell, sizeof(cell));
100 if (res == -1)
101 return (ENXIO);
102 if (res % sizeof(cell[0]))
103 return (ENXIO);
104 res /= sizeof(cell[0]);
105 regno *= naddr + nsize;
106 if (regno + naddr + nsize > res)
107 return (EINVAL);
108 pci_hi = pci ? cell[regno] : OFW_PADDR_NOT_PCI;
109 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK;
110 addr = 0;
111 for (c = 0; c < naddr; c++)
112 addr = ((uint64_t)addr << 32) | cell[regno++];
113 size = 0;
114 for (c = 0; c < nsize; c++)
115 size = ((uint64_t)size << 32) | cell[regno++];
116 /*
117 * Map the address range in the bridge's decoding window as given
118 * by the "ranges" property. If a node doesn't have such property
119 * or the property is empty, we assume an identity mapping. The
120 * standard says a missing property indicates no possible mapping.
121 * This code is more liberal since the intended use is to get a
122 * console running early, and a printf to warn of malformed data
123 * is probably futile before the console is fully set up.
124 */
125 parent = OF_parent(bridge);
126 while (parent != 0) {
127 get_addr_props(parent, &nbridge, NULL, &pcib);
128 res = OF_getencprop(bridge, "ranges", cell, sizeof(cell));
129 if (res < 1)
130 goto next;
131 if (res % sizeof(cell[0]))
132 return (ENXIO);
133 /* Capture pci_hi if we just transitioned onto a PCI bus. */
134 if (pcib && pci_hi == OFW_PADDR_NOT_PCI) {
135 pci_hi = cell[0];
136 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK;
137 }
138 res /= sizeof(cell[0]);
139 regno = 0;
140 while (regno < res) {
141 rspc = (pci ? cell[regno] : OFW_PADDR_NOT_PCI) &
142 OFW_PCI_PHYS_HI_SPACEMASK;
143 if (rspc != spc) {
144 regno += naddr + nbridge + nsize;
145 continue;
146 }
147 raddr = 0;
148 for (c = 0; c < naddr; c++)
149 raddr = ((uint64_t)raddr << 32) | cell[regno++];
150 rspc = (pcib)
151 ? cell[regno] & OFW_PCI_PHYS_HI_SPACEMASK
152 : OFW_PADDR_NOT_PCI;
153 baddr = 0;
154 for (c = 0; c < nbridge; c++)
155 baddr = ((uint64_t)baddr << 32) | cell[regno++];
156 rsize = 0;
157 for (c = 0; c < nsize; c++)
158 rsize = ((uint64_t)rsize << 32) | cell[regno++];
159 if (addr < raddr || addr >= raddr + rsize)
160 continue;
161 addr = addr - raddr + baddr;
162 if (rspc != OFW_PADDR_NOT_PCI)
163 spc = rspc;
164 }
165 next:
166 bridge = parent;
167 parent = OF_parent(bridge);
168 get_addr_props(bridge, &naddr, &nsize, &pci);
169 }
170
171 KASSERT(addr <= BUS_SPACE_MAXADDR,
172 ("Bus sddress is too large: %jx", (uintmax_t)addr));
173 KASSERT(size <= BUS_SPACE_MAXSIZE,
174 ("Bus size is too large: %jx", (uintmax_t)size));
175
176 *paddr = addr;
177 *psize = size;
178 if (ppci_hi != NULL)
179 *ppci_hi = pci_hi;
180
181 return (0);
182 }
183