blob: 60f561e307a99090b423bc3e02e90891e9d51b48 [file] [log] [blame]
David Gibson27fbaa92007-03-22 17:02:21 +11001/*
2 * devtree.c - convenience functions for device tree manipulation
3 * Copyright 2007 David Gibson, IBM Corporation.
4 * Copyright (c) 2007 Freescale Semiconductor, Inc.
5 *
6 * Authors: David Gibson <david@gibson.dropbear.id.au>
7 * Scott Wood <scottwood@freescale.com>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14#include <stdarg.h>
15#include <stddef.h>
16#include "types.h"
17#include "string.h"
18#include "stdio.h"
19#include "ops.h"
20
21void dt_fixup_memory(u64 start, u64 size)
22{
23 void *root, *memory;
24 int naddr, nsize, i;
25 u32 memreg[4];
26
27 root = finddevice("/");
28 if (getprop(root, "#address-cells", &naddr, sizeof(naddr)) < 0)
29 naddr = 2;
30 if (naddr < 1 || naddr > 2)
31 fatal("Can't cope with #address-cells == %d in /\n\r", naddr);
32
33 if (getprop(root, "#size-cells", &nsize, sizeof(nsize)) < 0)
34 nsize = 1;
35 if (nsize < 1 || nsize > 2)
36 fatal("Can't cope with #size-cells == %d in /\n\r", nsize);
37
38 i = 0;
39 if (naddr == 2)
40 memreg[i++] = start >> 32;
41 memreg[i++] = start & 0xffffffff;
42 if (nsize == 2)
43 memreg[i++] = size >> 32;
44 memreg[i++] = size & 0xffffffff;
45
46 memory = finddevice("/memory");
47 if (! memory) {
48 memory = create_node(NULL, "memory");
49 setprop_str(memory, "device_type", "memory");
50 }
51
52 printf("Memory <- <0x%x", memreg[0]);
53 for (i = 1; i < (naddr + nsize); i++)
54 printf(" 0x%x", memreg[i]);
55 printf("> (%ldMB)\n\r", (unsigned long)(size >> 20));
56
57 setprop(memory, "reg", memreg, (naddr + nsize)*sizeof(u32));
58}
59
60#define MHZ(x) ((x + 500000) / 1000000)
61
62void dt_fixup_cpu_clocks(u32 cpu, u32 tb, u32 bus)
63{
64 void *devp = NULL;
65
66 printf("CPU clock-frequency <- 0x%x (%dMHz)\n\r", cpu, MHZ(cpu));
67 printf("CPU timebase-frequency <- 0x%x (%dMHz)\n\r", tb, MHZ(tb));
68 if (bus > 0)
69 printf("CPU bus-frequency <- 0x%x (%dMHz)\n\r", bus, MHZ(bus));
70
71 while ((devp = find_node_by_devtype(devp, "cpu"))) {
72 setprop_val(devp, "clock-frequency", cpu);
73 setprop_val(devp, "timebase-frequency", tb);
74 if (bus > 0)
75 setprop_val(devp, "bus-frequency", bus);
76 }
Scott Wood643d3c12007-08-21 03:39:45 +100077
78 timebase_period_ns = 1000000000 / tb;
David Gibson27fbaa92007-03-22 17:02:21 +110079}
80
81void dt_fixup_clock(const char *path, u32 freq)
82{
83 void *devp = finddevice(path);
84
85 if (devp) {
86 printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq));
87 setprop_val(devp, "clock-frequency", freq);
88 }
89}
90
Kumar Galaad160682008-01-15 09:30:32 -060091void dt_fixup_mac_address_by_alias(const char *alias, const u8 *addr)
92{
93 void *devp = find_node_by_alias(alias);
94
95 if (devp) {
96 printf("%s: local-mac-address <-"
97 " %02x:%02x:%02x:%02x:%02x:%02x\n\r", alias,
98 addr[0], addr[1], addr[2],
99 addr[3], addr[4], addr[5]);
100
101 setprop(devp, "local-mac-address", addr, 6);
102 }
103}
104
Scott Wood27ff35d2007-09-25 06:09:11 +1000105void dt_fixup_mac_address(u32 index, const u8 *addr)
106{
107 void *devp = find_node_by_prop_value(NULL, "linux,network-index",
108 (void*)&index, sizeof(index));
109
110 if (devp) {
111 printf("ENET%d: local-mac-address <-"
112 " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
113 addr[0], addr[1], addr[2],
114 addr[3], addr[4], addr[5]);
115
116 setprop(devp, "local-mac-address", addr, 6);
117 }
118}
119
David Gibson27fbaa92007-03-22 17:02:21 +1100120void __dt_fixup_mac_addresses(u32 startindex, ...)
121{
122 va_list ap;
123 u32 index = startindex;
David Gibson27fbaa92007-03-22 17:02:21 +1100124 const u8 *addr;
125
126 va_start(ap, startindex);
David Gibson27fbaa92007-03-22 17:02:21 +1100127
Scott Wood27ff35d2007-09-25 06:09:11 +1000128 while ((addr = va_arg(ap, const u8 *)))
129 dt_fixup_mac_address(index++, addr);
David Gibson27fbaa92007-03-22 17:02:21 +1100130
David Gibson27fbaa92007-03-22 17:02:21 +1100131 va_end(ap);
132}
Scott Wood6e1af382007-03-26 15:52:24 -0500133
134#define MAX_ADDR_CELLS 4
Scott Wood6e1af382007-03-26 15:52:24 -0500135
Scott Woode5d8d542007-08-21 03:40:02 +1000136void dt_get_reg_format(void *node, u32 *naddr, u32 *nsize)
Scott Wood6e1af382007-03-26 15:52:24 -0500137{
138 if (getprop(node, "#address-cells", naddr, 4) != 4)
139 *naddr = 2;
140 if (getprop(node, "#size-cells", nsize, 4) != 4)
141 *nsize = 1;
142}
143
144static void copy_val(u32 *dest, u32 *src, int naddr)
145{
Scott Woode4bb6882007-04-27 03:08:13 +1000146 int pad = MAX_ADDR_CELLS - naddr;
147
148 memset(dest, 0, pad * 4);
149 memcpy(dest + pad, src, naddr * 4);
Scott Wood6e1af382007-03-26 15:52:24 -0500150}
151
152static int sub_reg(u32 *reg, u32 *sub)
153{
154 int i, borrow = 0;
155
Scott Woode4bb6882007-04-27 03:08:13 +1000156 for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) {
Scott Wood6e1af382007-03-26 15:52:24 -0500157 int prev_borrow = borrow;
158 borrow = reg[i] < sub[i] + prev_borrow;
159 reg[i] -= sub[i] + prev_borrow;
160 }
161
162 return !borrow;
163}
164
Scott Woode4bb6882007-04-27 03:08:13 +1000165static int add_reg(u32 *reg, u32 *add, int naddr)
Scott Wood6e1af382007-03-26 15:52:24 -0500166{
167 int i, carry = 0;
168
Scott Woode4bb6882007-04-27 03:08:13 +1000169 for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) {
Scott Wood6e1af382007-03-26 15:52:24 -0500170 u64 tmp = (u64)reg[i] + add[i] + carry;
171 carry = tmp >> 32;
172 reg[i] = (u32)tmp;
173 }
174
175 return !carry;
176}
177
178/* It is assumed that if the first byte of reg fits in a
179 * range, then the whole reg block fits.
180 */
181static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
182{
183 int i;
184 u32 end;
185
186 for (i = 0; i < MAX_ADDR_CELLS; i++) {
187 if (reg[i] < range[i])
188 return 0;
189 if (reg[i] > range[i])
190 break;
191 }
192
193 for (i = 0; i < MAX_ADDR_CELLS; i++) {
194 end = range[i] + rangesize[i];
195
196 if (reg[i] < end)
197 break;
198 if (reg[i] > end)
199 return 0;
200 }
201
202 return reg[i] != end;
203}
204
205/* reg must be MAX_ADDR_CELLS */
206static int find_range(u32 *reg, u32 *ranges, int nregaddr,
207 int naddr, int nsize, int buflen)
208{
209 int nrange = nregaddr + naddr + nsize;
210 int i;
211
212 for (i = 0; i + nrange <= buflen; i += nrange) {
213 u32 range_addr[MAX_ADDR_CELLS];
214 u32 range_size[MAX_ADDR_CELLS];
215
216 copy_val(range_addr, ranges + i, naddr);
217 copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
218
219 if (compare_reg(reg, range_addr, range_size))
220 return i;
221 }
222
223 return -1;
224}
225
226/* Currently only generic buses without special encodings are supported.
227 * In particular, PCI is not supported. Also, only the beginning of the
228 * reg block is tracked; size is ignored except in ranges.
229 */
Scott Wooda73ac502007-08-21 03:39:48 +1000230static u32 prop_buf[MAX_PROP_LEN / 4];
Mark A. Greer8895ea42007-04-28 06:48:24 +1000231
232static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
233 unsigned long *size)
Scott Wood6e1af382007-03-26 15:52:24 -0500234{
235 u32 last_addr[MAX_ADDR_CELLS];
236 u32 this_addr[MAX_ADDR_CELLS];
Scott Wood6e1af382007-03-26 15:52:24 -0500237 void *parent;
238 u64 ret_addr, ret_size;
Scott Wood06028012007-08-21 03:39:46 +1000239 u32 naddr, nsize, prev_naddr, prev_nsize;
Scott Wood6e1af382007-03-26 15:52:24 -0500240 int buflen, offset;
241
242 parent = get_parent(node);
243 if (!parent)
244 return 0;
245
Scott Woode5d8d542007-08-21 03:40:02 +1000246 dt_get_reg_format(parent, &naddr, &nsize);
Scott Wood6e1af382007-03-26 15:52:24 -0500247
248 if (nsize > 2)
249 return 0;
250
Scott Wood6e1af382007-03-26 15:52:24 -0500251 offset = (naddr + nsize) * res;
252
Mark A. Greer8895ea42007-04-28 06:48:24 +1000253 if (reglen < offset + naddr + nsize ||
Scott Wooda73ac502007-08-21 03:39:48 +1000254 MAX_PROP_LEN < (offset + naddr + nsize) * 4)
Scott Wood6e1af382007-03-26 15:52:24 -0500255 return 0;
256
Scott Wooda73ac502007-08-21 03:39:48 +1000257 copy_val(last_addr, prop_buf + offset, naddr);
Scott Wood6e1af382007-03-26 15:52:24 -0500258
Scott Wooda73ac502007-08-21 03:39:48 +1000259 ret_size = prop_buf[offset + naddr];
Scott Wood6e1af382007-03-26 15:52:24 -0500260 if (nsize == 2) {
261 ret_size <<= 32;
Scott Wooda73ac502007-08-21 03:39:48 +1000262 ret_size |= prop_buf[offset + naddr + 1];
Scott Wood6e1af382007-03-26 15:52:24 -0500263 }
264
Scott Wood06028012007-08-21 03:39:46 +1000265 for (;;) {
Scott Wood6e1af382007-03-26 15:52:24 -0500266 prev_naddr = naddr;
Scott Wood06028012007-08-21 03:39:46 +1000267 prev_nsize = nsize;
268 node = parent;
Scott Wood6e1af382007-03-26 15:52:24 -0500269
Scott Wood06028012007-08-21 03:39:46 +1000270 parent = get_parent(node);
271 if (!parent)
272 break;
273
Scott Woode5d8d542007-08-21 03:40:02 +1000274 dt_get_reg_format(parent, &naddr, &nsize);
Scott Wood6e1af382007-03-26 15:52:24 -0500275
Scott Wooda73ac502007-08-21 03:39:48 +1000276 buflen = getprop(node, "ranges", prop_buf,
277 sizeof(prop_buf));
Scott Wood06028012007-08-21 03:39:46 +1000278 if (buflen == 0)
Scott Wood6e1af382007-03-26 15:52:24 -0500279 continue;
Scott Wooda73ac502007-08-21 03:39:48 +1000280 if (buflen < 0 || buflen > sizeof(prop_buf))
Scott Wood6e1af382007-03-26 15:52:24 -0500281 return 0;
282
Scott Wooda73ac502007-08-21 03:39:48 +1000283 offset = find_range(last_addr, prop_buf, prev_naddr,
Scott Wood06028012007-08-21 03:39:46 +1000284 naddr, prev_nsize, buflen / 4);
Scott Wood6e1af382007-03-26 15:52:24 -0500285
286 if (offset < 0)
287 return 0;
288
Scott Wooda73ac502007-08-21 03:39:48 +1000289 copy_val(this_addr, prop_buf + offset, prev_naddr);
Scott Wood6e1af382007-03-26 15:52:24 -0500290
291 if (!sub_reg(last_addr, this_addr))
292 return 0;
293
Scott Wooda73ac502007-08-21 03:39:48 +1000294 copy_val(this_addr, prop_buf + offset + prev_naddr, naddr);
Scott Wood6e1af382007-03-26 15:52:24 -0500295
Scott Woode4bb6882007-04-27 03:08:13 +1000296 if (!add_reg(last_addr, this_addr, naddr))
Scott Wood6e1af382007-03-26 15:52:24 -0500297 return 0;
298 }
299
300 if (naddr > 2)
301 return 0;
302
Scott Woode4bb6882007-04-27 03:08:13 +1000303 ret_addr = ((u64)last_addr[2] << 32) | last_addr[3];
Scott Wood6e1af382007-03-26 15:52:24 -0500304
305 if (sizeof(void *) == 4 &&
306 (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
307 ret_addr + ret_size > 0x100000000ULL))
308 return 0;
309
310 *addr = ret_addr;
311 if (size)
312 *size = ret_size;
313
314 return 1;
315}
Mark A. Greer8895ea42007-04-28 06:48:24 +1000316
317int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
318{
319 int reglen;
320
Scott Wooda73ac502007-08-21 03:39:48 +1000321 reglen = getprop(node, "reg", prop_buf, sizeof(prop_buf)) / 4;
Mark A. Greer8895ea42007-04-28 06:48:24 +1000322 return dt_xlate(node, res, reglen, addr, size);
323}
324
325int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
326{
327
Scott Wooda73ac502007-08-21 03:39:48 +1000328 if (buflen > sizeof(prop_buf))
Mark A. Greer8895ea42007-04-28 06:48:24 +1000329 return 0;
330
Scott Wooda73ac502007-08-21 03:39:48 +1000331 memcpy(prop_buf, buf, buflen);
Mark A. Greer8895ea42007-04-28 06:48:24 +1000332 return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
333}
Scott Wooda73ac502007-08-21 03:39:48 +1000334
335int dt_is_compatible(void *node, const char *compat)
336{
337 char *buf = (char *)prop_buf;
338 int len, pos;
339
340 len = getprop(node, "compatible", buf, MAX_PROP_LEN);
341 if (len < 0)
342 return 0;
343
344 for (pos = 0; pos < len; pos++) {
345 if (!strcmp(buf + pos, compat))
346 return 1;
347
348 pos += strnlen(&buf[pos], len - pos);
349 }
350
351 return 0;
352}