xref: /freebsd/sys/dev/ofw/ofw_subr.c (revision 273c26a3c3bea87a241d6879abd4f991db180bf0)
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/reboot.h>
38 #include <sys/rman.h>
39 
40 #include <machine/bus.h>
41 
42 #include <dev/ofw/openfirm.h>
43 #include <dev/ofw/ofw_pci.h>
44 #include <dev/ofw/ofw_subr.h>
45 
46 static void
47 get_addr_props(phandle_t node, uint32_t *addrp, uint32_t *sizep, int *pcip)
48 {
49 	char type[64];
50 	uint32_t addr, size;
51 	int pci, res;
52 
53 	res = OF_getencprop(node, "#address-cells", &addr, sizeof(addr));
54 	if (res == -1)
55 		addr = 2;
56 	res = OF_getencprop(node, "#size-cells", &size, sizeof(size));
57 	if (res == -1)
58 		size = 1;
59 	pci = 0;
60 	if (addr == 3 && size == 2) {
61 		res = OF_getprop(node, "device_type", type, sizeof(type));
62 		if (res != -1) {
63 			type[sizeof(type) - 1] = '\0';
64 			pci = (strcmp(type, "pci") == 0) ? 1 : 0;
65 		}
66 	}
67 	if (addrp != NULL)
68 		*addrp = addr;
69 	if (sizep != NULL)
70 		*sizep = size;
71 	if (pcip != NULL)
72 		*pcip = pci;
73 }
74 
75 int
76 ofw_reg_to_paddr(phandle_t dev, int regno, bus_addr_t *paddr,
77     bus_size_t *psize, pcell_t *ppci_hi)
78 {
79 	pcell_t cell[32], pci_hi;
80 	uint64_t addr, raddr, baddr;
81 	uint64_t size, rsize;
82 	uint32_t c, nbridge, naddr, nsize;
83 	phandle_t bridge, parent;
84 	u_int spc, rspc;
85 	int pci, pcib, res;
86 
87 	/* Sanity checking. */
88 	if (dev == 0)
89 		return (EINVAL);
90 	bridge = OF_parent(dev);
91 	if (bridge == 0)
92 		return (EINVAL);
93 	if (regno < 0)
94 		return (EINVAL);
95 	if (paddr == NULL || psize == NULL)
96 		return (EINVAL);
97 
98 	get_addr_props(bridge, &naddr, &nsize, &pci);
99 	res = OF_getencprop(dev, (pci) ? "assigned-addresses" : "reg",
100 	    cell, sizeof(cell));
101 	if (res == -1)
102 		return (ENXIO);
103 	if (res % sizeof(cell[0]))
104 		return (ENXIO);
105 	res /= sizeof(cell[0]);
106 	regno *= naddr + nsize;
107 	if (regno + naddr + nsize > res)
108 		return (EINVAL);
109 	pci_hi = pci ? cell[regno] : OFW_PADDR_NOT_PCI;
110 	spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK;
111 	addr = 0;
112 	for (c = 0; c < naddr; c++)
113 		addr = ((uint64_t)addr << 32) | cell[regno++];
114 	size = 0;
115 	for (c = 0; c < nsize; c++)
116 		size = ((uint64_t)size << 32) | cell[regno++];
117 	/*
118 	 * Map the address range in the bridge's decoding window as given
119 	 * by the "ranges" property. If a node doesn't have such property
120 	 * or the property is empty, we assume an identity mapping.  The
121 	 * standard says a missing property indicates no possible mapping.
122 	 * This code is more liberal since the intended use is to get a
123 	 * console running early, and a printf to warn of malformed data
124 	 * is probably futile before the console is fully set up.
125 	 */
126 	parent = OF_parent(bridge);
127 	while (parent != 0) {
128 		get_addr_props(parent, &nbridge, NULL, &pcib);
129 		res = OF_getencprop(bridge, "ranges", cell, sizeof(cell));
130 		if (res < 1)
131 			goto next;
132 		if (res % sizeof(cell[0]))
133 			return (ENXIO);
134 		/* Capture pci_hi if we just transitioned onto a PCI bus. */
135 		if (pcib && pci_hi == OFW_PADDR_NOT_PCI) {
136 			pci_hi = cell[0];
137 			spc = pci_hi & OFW_PCI_PHYS_HI_SPACEMASK;
138 		}
139 		res /= sizeof(cell[0]);
140 		regno = 0;
141 		while (regno < res) {
142 			rspc = (pci ? cell[regno] : OFW_PADDR_NOT_PCI) &
143 			    OFW_PCI_PHYS_HI_SPACEMASK;
144 			if (rspc != spc) {
145 				regno += naddr + nbridge + nsize;
146 				continue;
147 			}
148 			raddr = 0;
149 			for (c = 0; c < naddr; c++)
150 				raddr = ((uint64_t)raddr << 32) | cell[regno++];
151 			rspc = (pcib)
152 			    ? cell[regno] & OFW_PCI_PHYS_HI_SPACEMASK
153 			    : OFW_PADDR_NOT_PCI;
154 			baddr = 0;
155 			for (c = 0; c < nbridge; c++)
156 				baddr = ((uint64_t)baddr << 32) | cell[regno++];
157 			rsize = 0;
158 			for (c = 0; c < nsize; c++)
159 				rsize = ((uint64_t)rsize << 32) | cell[regno++];
160 			if (addr < raddr || addr >= raddr + rsize)
161 				continue;
162 			addr = addr - raddr + baddr;
163 			if (rspc != OFW_PADDR_NOT_PCI)
164 				spc = rspc;
165 		}
166 	next:
167 		bridge = parent;
168 		parent = OF_parent(bridge);
169 		get_addr_props(bridge, &naddr, &nsize, &pci);
170 	}
171 
172 	KASSERT(addr <= BUS_SPACE_MAXADDR,
173 	    ("Bus sddress is too large: %jx", (uintmax_t)addr));
174 	KASSERT(size <= BUS_SPACE_MAXSIZE,
175 	    ("Bus size is too large: %jx", (uintmax_t)size));
176 
177 	*paddr = addr;
178 	*psize = size;
179 	if (ppci_hi != NULL)
180 		*ppci_hi = pci_hi;
181 
182 	return (0);
183 }
184 
185 /* Parse cmd line args as env - copied from xlp_machdep. */
186 /* XXX-BZ this should really be centrally provided for all (boot) code. */
187 static void
188 _parse_bootargs(char *cmdline)
189 {
190 	char *n, *v;
191 
192 	while ((v = strsep(&cmdline, " \n")) != NULL) {
193 		if (*v == '\0')
194 			continue;
195 		if (*v == '-') {
196 			while (*v != '\0') {
197 				v++;
198 				switch (*v) {
199 				case 'a': boothowto |= RB_ASKNAME; break;
200 				/* Someone should simulate that ;-) */
201 				case 'C': boothowto |= RB_CDROM; break;
202 				case 'd': boothowto |= RB_KDB; break;
203 				case 'D': boothowto |= RB_MULTIPLE; break;
204 				case 'm': boothowto |= RB_MUTE; break;
205 				case 'g': boothowto |= RB_GDB; break;
206 				case 'h': boothowto |= RB_SERIAL; break;
207 				case 'p': boothowto |= RB_PAUSE; break;
208 				case 'r': boothowto |= RB_DFLTROOT; break;
209 				case 's': boothowto |= RB_SINGLE; break;
210 				case 'v': boothowto |= RB_VERBOSE; break;
211 				}
212 			}
213 		} else {
214 			n = strsep(&v, "=");
215 			if (v == NULL)
216 				kern_setenv(n, "1");
217 			else
218 				kern_setenv(n, v);
219 		}
220 	}
221 }
222 
223 /*
224  * This is intended to be called early on, right after the OF system is
225  * initialized, so pmap may not be up yet.
226  */
227 int
228 ofw_parse_bootargs(void)
229 {
230 	phandle_t chosen;
231 	char buf[2048];		/* early stack supposedly big enough */
232 	int err;
233 
234 	chosen = OF_finddevice("/chosen");
235 	if (chosen <= 0)
236 		return (chosen);
237 
238 	if ((err = OF_getprop(chosen, "bootargs", buf, sizeof(buf))) != -1) {
239 		_parse_bootargs(buf);
240 		return (0);
241 	}
242 
243 	return (err);
244 }
245