1 /*-
2 * Copyright (c) 2005 by Marius Strobl <marius@FreeBSD.org>
3 * Copyright (c) 2015 Ian Lepore <ian@freebsd.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 * The initial ofw_reg_to_paddr() implementation has been copied from powerpc
28 * ofw_machdep.c OF_decode_addr(). It was added by Marcel Moolenaar, who did not
29 * assert copyright with the addition but still deserves credit for the work.
30 * The powerpc OF_decode_addr() in turn was based on the sparc64 counterpart
31 * written by Marius Strobl.
32 */
33
34 #include <sys/cdefs.h>
35 #include <sys/param.h>
36 #include <sys/boot.h>
37 #include <sys/bus.h>
38 #include <sys/libkern.h>
39 #include <sys/reboot.h>
40 #include <sys/rman.h>
41
42 #include <machine/bus.h>
43
44 #include <dev/ofw/openfirm.h>
45 #include <dev/ofw/ofw_pci.h>
46 #include <dev/ofw/ofw_subr.h>
47
48 static void
get_addr_props(phandle_t node,uint32_t * addrp,uint32_t * sizep,int * pcip)49 get_addr_props(phandle_t node, uint32_t *addrp, uint32_t *sizep, int *pcip)
50 {
51 char type[64];
52 uint32_t addr, size;
53 int pci, res;
54
55 res = OF_getencprop(node, "#address-cells", &addr, sizeof(addr));
56 if (res == -1)
57 addr = 2;
58 res = OF_getencprop(node, "#size-cells", &size, sizeof(size));
59 if (res == -1)
60 size = 1;
61 pci = 0;
62 if (addr == 3 && size == 2) {
63 res = OF_getprop(node, "device_type", type, sizeof(type));
64 if (res != -1) {
65 type[sizeof(type) - 1] = '\0';
66 if (strcmp(type, "pci") == 0 ||
67 strcmp(type, "pciex")== 0)
68 pci = 1;
69 }
70 }
71 if (addrp != NULL)
72 *addrp = addr;
73 if (sizep != NULL)
74 *sizep = size;
75 if (pcip != NULL)
76 *pcip = pci;
77 }
78
79 int
ofw_reg_to_paddr(phandle_t dev,int regno,bus_addr_t * paddr,bus_size_t * psize,pcell_t * ppci_hi)80 ofw_reg_to_paddr(phandle_t dev, int regno, bus_addr_t *paddr,
81 bus_size_t *psize, pcell_t *ppci_hi)
82 {
83 static pcell_t cell[256];
84 pcell_t pci_hi;
85 uint64_t addr, raddr, baddr;
86 uint64_t size, rsize;
87 uint32_t c, nbridge, naddr, nsize;
88 phandle_t bridge, parent;
89 u_int spc, rspc;
90 int pci, pcib, res;
91
92 /* Sanity checking. */
93 if (dev == 0)
94 return (EINVAL);
95 bridge = OF_parent(dev);
96 if (bridge == 0)
97 return (EINVAL);
98 if (regno < 0)
99 return (EINVAL);
100 if (paddr == NULL || psize == NULL)
101 return (EINVAL);
102
103 get_addr_props(bridge, &naddr, &nsize, &pci);
104 res = OF_getencprop(dev, (pci) ? "assigned-addresses" : "reg",
105 cell, sizeof(cell));
106 if (res == -1)
107 return (ENXIO);
108 if (res % sizeof(cell[0]))
109 return (ENXIO);
110 res /= sizeof(cell[0]);
111 regno *= naddr + nsize;
112 if (regno + naddr + nsize > res)
113 return (EINVAL);
114 pci_hi = pci ? cell[regno] : OFW_PADDR_NOT_PCI;
115 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK;
116 addr = 0;
117 for (c = 0; c < naddr; c++)
118 addr = ((uint64_t)addr << 32) | cell[regno++];
119 size = 0;
120 for (c = 0; c < nsize; c++)
121 size = ((uint64_t)size << 32) | cell[regno++];
122 /*
123 * Map the address range in the bridge's decoding window as given
124 * by the "ranges" property. If a node doesn't have such property
125 * or the property is empty, we assume an identity mapping. The
126 * standard says a missing property indicates no possible mapping.
127 * This code is more liberal since the intended use is to get a
128 * console running early, and a printf to warn of malformed data
129 * is probably futile before the console is fully set up.
130 */
131 parent = OF_parent(bridge);
132 while (parent != 0) {
133 get_addr_props(parent, &nbridge, NULL, &pcib);
134 res = OF_getencprop(bridge, "ranges", cell, sizeof(cell));
135 if (res < 1)
136 goto next;
137 if (res % sizeof(cell[0]))
138 return (ENXIO);
139 /* Capture pci_hi if we just transitioned onto a PCI bus. */
140 if (pcib && pci_hi == OFW_PADDR_NOT_PCI) {
141 pci_hi = cell[0];
142 spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK;
143 }
144 res /= sizeof(cell[0]);
145 regno = 0;
146 while (regno < res) {
147 rspc = (pci ? cell[regno] : OFW_PADDR_NOT_PCI) &
148 OFW_PCI_PHYS_HI_SPACEMASK;
149 if (rspc != spc) {
150 regno += naddr + nbridge + nsize;
151 continue;
152 }
153 raddr = 0;
154 for (c = 0; c < naddr; c++)
155 raddr = ((uint64_t)raddr << 32) | cell[regno++];
156 rspc = (pcib)
157 ? cell[regno] & OFW_PCI_PHYS_HI_SPACEMASK
158 : OFW_PADDR_NOT_PCI;
159 baddr = 0;
160 for (c = 0; c < nbridge; c++)
161 baddr = ((uint64_t)baddr << 32) | cell[regno++];
162 rsize = 0;
163 for (c = 0; c < nsize; c++)
164 rsize = ((uint64_t)rsize << 32) | cell[regno++];
165 if (addr < raddr || addr >= raddr + rsize)
166 continue;
167 addr = addr - raddr + baddr;
168 if (rspc != OFW_PADDR_NOT_PCI)
169 spc = rspc;
170 }
171 next:
172 bridge = parent;
173 parent = OF_parent(bridge);
174 get_addr_props(bridge, &naddr, &nsize, &pci);
175 }
176
177 KASSERT(addr <= BUS_SPACE_MAXADDR,
178 ("Bus address is too large: %jx", (uintmax_t)addr));
179 KASSERT(size <= BUS_SPACE_MAXSIZE,
180 ("Bus size is too large: %jx", (uintmax_t)size));
181
182 *paddr = addr;
183 *psize = size;
184 if (ppci_hi != NULL)
185 *ppci_hi = pci_hi;
186
187 return (0);
188 }
189
190 /*
191 * This is intended to be called early on, right after the OF system is
192 * initialized, so pmap may not be up yet.
193 */
194 int
ofw_parse_bootargs(void)195 ofw_parse_bootargs(void)
196 {
197 phandle_t chosen;
198 char buf[2048]; /* early stack supposedly big enough */
199 int err;
200
201 chosen = OF_finddevice("/chosen");
202 if (chosen == -1)
203 return (chosen);
204
205 if ((err = OF_getprop(chosen, "bootargs", buf, sizeof(buf))) != -1) {
206 boothowto |= boot_parse_cmdline(buf);
207 return (0);
208 }
209
210 return (err);
211 }
212