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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * devtree.c - convenience functions for device tree manipulation
4 * Copyright 2007 David Gibson, IBM Corporation.
5 * Copyright (c) 2007 Freescale Semiconductor, Inc.
6 *
7 * Authors: David Gibson <david@gibson.dropbear.id.au>
8 * Scott Wood <scottwood@freescale.com>
9 */
10#include <stdarg.h>
11#include <stddef.h>
12#include "types.h"
13#include "string.h"
14#include "stdio.h"
15#include "ops.h"
16#include "of.h"
17
18void dt_fixup_memory(u64 start, u64 size)
19{
20 void *root, *memory;
21 int naddr, nsize, i;
22 u32 memreg[4];
23
24 root = finddevice("/");
25 if (getprop(root, "#address-cells", &naddr, sizeof(naddr)) < 0)
26 naddr = 2;
27 else
28 naddr = be32_to_cpu(naddr);
29 if (naddr < 1 || naddr > 2)
30 fatal("Can't cope with #address-cells == %d in /\n\r", naddr);
31
32 if (getprop(root, "#size-cells", &nsize, sizeof(nsize)) < 0)
33 nsize = 1;
34 else
35 nsize = be32_to_cpu(nsize);
36 if (nsize < 1 || nsize > 2)
37 fatal("Can't cope with #size-cells == %d in /\n\r", nsize);
38
39 i = 0;
40 if (naddr == 2)
41 memreg[i++] = cpu_to_be32(start >> 32);
42 memreg[i++] = cpu_to_be32(start & 0xffffffff);
43 if (nsize == 2)
44 memreg[i++] = cpu_to_be32(size >> 32);
45 memreg[i++] = cpu_to_be32(size & 0xffffffff);
46
47 memory = finddevice("/memory");
48 if (! memory) {
49 memory = create_node(NULL, "memory");
50 setprop_str(memory, "device_type", "memory");
51 }
52
53 printf("Memory <- <0x%x", be32_to_cpu(memreg[0]));
54 for (i = 1; i < (naddr + nsize); i++)
55 printf(" 0x%x", be32_to_cpu(memreg[i]));
56 printf("> (%ldMB)\n\r", (unsigned long)(size >> 20));
57
58 setprop(memory, "reg", memreg, (naddr + nsize)*sizeof(u32));
59}
60
61#define MHZ(x) ((x + 500000) / 1000000)
62
63void dt_fixup_cpu_clocks(u32 cpu, u32 tb, u32 bus)
64{
65 void *devp = NULL;
66
67 printf("CPU clock-frequency <- 0x%x (%dMHz)\n\r", cpu, MHZ(cpu));
68 printf("CPU timebase-frequency <- 0x%x (%dMHz)\n\r", tb, MHZ(tb));
69 if (bus > 0)
70 printf("CPU bus-frequency <- 0x%x (%dMHz)\n\r", bus, MHZ(bus));
71
72 while ((devp = find_node_by_devtype(devp, "cpu"))) {
73 setprop_val(devp, "clock-frequency", cpu_to_be32(cpu));
74 setprop_val(devp, "timebase-frequency", cpu_to_be32(tb));
75 if (bus > 0)
76 setprop_val(devp, "bus-frequency", cpu_to_be32(bus));
77 }
78
79 timebase_period_ns = 1000000000 / tb;
80}
81
82void dt_fixup_clock(const char *path, u32 freq)
83{
84 void *devp = finddevice(path);
85
86 if (devp) {
87 printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq));
88 setprop_val(devp, "clock-frequency", cpu_to_be32(freq));
89 }
90}
91
92void dt_fixup_mac_address_by_alias(const char *alias, const u8 *addr)
93{
94 void *devp = find_node_by_alias(alias);
95
96 if (devp) {
97 printf("%s: local-mac-address <-"
98 " %02x:%02x:%02x:%02x:%02x:%02x\n\r", alias,
99 addr[0], addr[1], addr[2],
100 addr[3], addr[4], addr[5]);
101
102 setprop(devp, "local-mac-address", addr, 6);
103 }
104}
105
106void dt_fixup_mac_address(u32 index, const u8 *addr)
107{
108 void *devp = find_node_by_prop_value(NULL, "linux,network-index",
109 (void*)&index, sizeof(index));
110
111 if (devp) {
112 printf("ENET%d: local-mac-address <-"
113 " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
114 addr[0], addr[1], addr[2],
115 addr[3], addr[4], addr[5]);
116
117 setprop(devp, "local-mac-address", addr, 6);
118 }
119}
120
121void __dt_fixup_mac_addresses(u32 startindex, ...)
122{
123 va_list ap;
124 u32 index = startindex;
125 const u8 *addr;
126
127 va_start(ap, startindex);
128
129 while ((addr = va_arg(ap, const u8 *)))
130 dt_fixup_mac_address(index++, addr);
131
132 va_end(ap);
133}
134
135#define MAX_ADDR_CELLS 4
136
137void dt_get_reg_format(void *node, u32 *naddr, u32 *nsize)
138{
139 if (getprop(node, "#address-cells", naddr, 4) != 4)
140 *naddr = 2;
141 else
142 *naddr = be32_to_cpu(*naddr);
143 if (getprop(node, "#size-cells", nsize, 4) != 4)
144 *nsize = 1;
145 else
146 *nsize = be32_to_cpu(*nsize);
147}
148
149static void copy_val(u32 *dest, u32 *src, int naddr)
150{
151 int pad = MAX_ADDR_CELLS - naddr;
152
153 memset(dest, 0, pad * 4);
154 memcpy(dest + pad, src, naddr * 4);
155}
156
157static int sub_reg(u32 *reg, u32 *sub)
158{
159 int i, borrow = 0;
160
161 for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) {
162 int prev_borrow = borrow;
163 borrow = reg[i] < sub[i] + prev_borrow;
164 reg[i] -= sub[i] + prev_borrow;
165 }
166
167 return !borrow;
168}
169
170static int add_reg(u32 *reg, u32 *add, int naddr)
171{
172 int i, carry = 0;
173
174 for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) {
175 u64 tmp = (u64)be32_to_cpu(reg[i]) + be32_to_cpu(add[i]) + carry;
176 carry = tmp >> 32;
177 reg[i] = cpu_to_be32((u32)tmp);
178 }
179
180 return !carry;
181}
182
183/* It is assumed that if the first byte of reg fits in a
184 * range, then the whole reg block fits.
185 */
186static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
187{
188 int i;
189 u32 end;
190
191 for (i = 0; i < MAX_ADDR_CELLS; i++) {
192 if (be32_to_cpu(reg[i]) < be32_to_cpu(range[i]))
193 return 0;
194 if (be32_to_cpu(reg[i]) > be32_to_cpu(range[i]))
195 break;
196 }
197
198 for (i = 0; i < MAX_ADDR_CELLS; i++) {
199 end = be32_to_cpu(range[i]) + be32_to_cpu(rangesize[i]);
200
201 if (be32_to_cpu(reg[i]) < end)
202 break;
203 if (be32_to_cpu(reg[i]) > end)
204 return 0;
205 }
206
207 return reg[i] != end;
208}
209
210/* reg must be MAX_ADDR_CELLS */
211static int find_range(u32 *reg, u32 *ranges, int nregaddr,
212 int naddr, int nsize, int buflen)
213{
214 int nrange = nregaddr + naddr + nsize;
215 int i;
216
217 for (i = 0; i + nrange <= buflen; i += nrange) {
218 u32 range_addr[MAX_ADDR_CELLS];
219 u32 range_size[MAX_ADDR_CELLS];
220
221 copy_val(range_addr, ranges + i, nregaddr);
222 copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
223
224 if (compare_reg(reg, range_addr, range_size))
225 return i;
226 }
227
228 return -1;
229}
230
231/* Currently only generic buses without special encodings are supported.
232 * In particular, PCI is not supported. Also, only the beginning of the
233 * reg block is tracked; size is ignored except in ranges.
234 */
235static u32 prop_buf[MAX_PROP_LEN / 4];
236
237static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
238 unsigned long *size)
239{
240 u32 last_addr[MAX_ADDR_CELLS];
241 u32 this_addr[MAX_ADDR_CELLS];
242 void *parent;
243 u64 ret_addr, ret_size;
244 u32 naddr, nsize, prev_naddr, prev_nsize;
245 int buflen, offset;
246
247 parent = get_parent(node);
248 if (!parent)
249 return 0;
250
251 dt_get_reg_format(parent, &naddr, &nsize);
252 if (nsize > 2)
253 return 0;
254
255 offset = (naddr + nsize) * res;
256
257 if (reglen < offset + naddr + nsize ||
258 MAX_PROP_LEN < (offset + naddr + nsize) * 4)
259 return 0;
260
261 copy_val(last_addr, prop_buf + offset, naddr);
262
263 ret_size = be32_to_cpu(prop_buf[offset + naddr]);
264 if (nsize == 2) {
265 ret_size <<= 32;
266 ret_size |= be32_to_cpu(prop_buf[offset + naddr + 1]);
267 }
268
269 for (;;) {
270 prev_naddr = naddr;
271 prev_nsize = nsize;
272 node = parent;
273
274 parent = get_parent(node);
275 if (!parent)
276 break;
277
278 dt_get_reg_format(parent, &naddr, &nsize);
279
280 buflen = getprop(node, "ranges", prop_buf,
281 sizeof(prop_buf));
282 if (buflen == 0)
283 continue;
284 if (buflen < 0 || buflen > sizeof(prop_buf))
285 return 0;
286
287 offset = find_range(last_addr, prop_buf, prev_naddr,
288 naddr, prev_nsize, buflen / 4);
289 if (offset < 0)
290 return 0;
291
292 copy_val(this_addr, prop_buf + offset, prev_naddr);
293
294 if (!sub_reg(last_addr, this_addr))
295 return 0;
296
297 copy_val(this_addr, prop_buf + offset + prev_naddr, naddr);
298
299 if (!add_reg(last_addr, this_addr, naddr))
300 return 0;
301 }
302
303 if (naddr > 2)
304 return 0;
305
306 ret_addr = ((u64)be32_to_cpu(last_addr[2]) << 32) | be32_to_cpu(last_addr[3]);
307 if (sizeof(void *) == 4 &&
308 (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
309 ret_addr + ret_size > 0x100000000ULL))
310 return 0;
311
312 *addr = ret_addr;
313 if (size)
314 *size = ret_size;
315
316 return 1;
317}
318
319int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
320{
321 int reglen;
322
323 reglen = getprop(node, "reg", prop_buf, sizeof(prop_buf)) / 4;
324 return dt_xlate(node, res, reglen, addr, size);
325}
326
327int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
328{
329
330 if (buflen > sizeof(prop_buf))
331 return 0;
332
333 memcpy(prop_buf, buf, buflen);
334 return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
335}
336
337int dt_is_compatible(void *node, const char *compat)
338{
339 char *buf = (char *)prop_buf;
340 int len, pos;
341
342 len = getprop(node, "compatible", buf, MAX_PROP_LEN);
343 if (len < 0)
344 return 0;
345
346 for (pos = 0; pos < len; pos++) {
347 if (!strcmp(buf + pos, compat))
348 return 1;
349
350 pos += strnlen(&buf[pos], len - pos);
351 }
352
353 return 0;
354}
355
356int dt_get_virtual_reg(void *node, void **addr, int nres)
357{
358 unsigned long xaddr;
359 int n, i;
360
361 n = getprop(node, "virtual-reg", addr, nres * 4);
362 if (n > 0) {
363 for (i = 0; i < n/4; i ++)
364 ((u32 *)addr)[i] = be32_to_cpu(((u32 *)addr)[i]);
365 return n / 4;
366 }
367
368 for (n = 0; n < nres; n++) {
369 if (!dt_xlate_reg(node, n, &xaddr, NULL))
370 break;
371
372 addr[n] = (void *)xaddr;
373 }
374
375 return n;
376}
377
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * devtree.c - convenience functions for device tree manipulation
4 * Copyright 2007 David Gibson, IBM Corporation.
5 * Copyright (c) 2007 Freescale Semiconductor, Inc.
6 *
7 * Authors: David Gibson <david@gibson.dropbear.id.au>
8 * Scott Wood <scottwood@freescale.com>
9 */
10#include <stdarg.h>
11#include <stddef.h>
12#include "types.h"
13#include "string.h"
14#include "stdio.h"
15#include "ops.h"
16
17void dt_fixup_memory(u64 start, u64 size)
18{
19 void *root, *memory;
20 int naddr, nsize, i;
21 u32 memreg[4];
22
23 root = finddevice("/");
24 if (getprop(root, "#address-cells", &naddr, sizeof(naddr)) < 0)
25 naddr = 2;
26 if (naddr < 1 || naddr > 2)
27 fatal("Can't cope with #address-cells == %d in /\n\r", naddr);
28
29 if (getprop(root, "#size-cells", &nsize, sizeof(nsize)) < 0)
30 nsize = 1;
31 if (nsize < 1 || nsize > 2)
32 fatal("Can't cope with #size-cells == %d in /\n\r", nsize);
33
34 i = 0;
35 if (naddr == 2)
36 memreg[i++] = start >> 32;
37 memreg[i++] = start & 0xffffffff;
38 if (nsize == 2)
39 memreg[i++] = size >> 32;
40 memreg[i++] = size & 0xffffffff;
41
42 memory = finddevice("/memory");
43 if (! memory) {
44 memory = create_node(NULL, "memory");
45 setprop_str(memory, "device_type", "memory");
46 }
47
48 printf("Memory <- <0x%x", memreg[0]);
49 for (i = 1; i < (naddr + nsize); i++)
50 printf(" 0x%x", memreg[i]);
51 printf("> (%ldMB)\n\r", (unsigned long)(size >> 20));
52
53 setprop(memory, "reg", memreg, (naddr + nsize)*sizeof(u32));
54}
55
56#define MHZ(x) ((x + 500000) / 1000000)
57
58void dt_fixup_cpu_clocks(u32 cpu, u32 tb, u32 bus)
59{
60 void *devp = NULL;
61
62 printf("CPU clock-frequency <- 0x%x (%dMHz)\n\r", cpu, MHZ(cpu));
63 printf("CPU timebase-frequency <- 0x%x (%dMHz)\n\r", tb, MHZ(tb));
64 if (bus > 0)
65 printf("CPU bus-frequency <- 0x%x (%dMHz)\n\r", bus, MHZ(bus));
66
67 while ((devp = find_node_by_devtype(devp, "cpu"))) {
68 setprop_val(devp, "clock-frequency", cpu);
69 setprop_val(devp, "timebase-frequency", tb);
70 if (bus > 0)
71 setprop_val(devp, "bus-frequency", bus);
72 }
73
74 timebase_period_ns = 1000000000 / tb;
75}
76
77void dt_fixup_clock(const char *path, u32 freq)
78{
79 void *devp = finddevice(path);
80
81 if (devp) {
82 printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq));
83 setprop_val(devp, "clock-frequency", freq);
84 }
85}
86
87void dt_fixup_mac_address_by_alias(const char *alias, const u8 *addr)
88{
89 void *devp = find_node_by_alias(alias);
90
91 if (devp) {
92 printf("%s: local-mac-address <-"
93 " %02x:%02x:%02x:%02x:%02x:%02x\n\r", alias,
94 addr[0], addr[1], addr[2],
95 addr[3], addr[4], addr[5]);
96
97 setprop(devp, "local-mac-address", addr, 6);
98 }
99}
100
101void dt_fixup_mac_address(u32 index, const u8 *addr)
102{
103 void *devp = find_node_by_prop_value(NULL, "linux,network-index",
104 (void*)&index, sizeof(index));
105
106 if (devp) {
107 printf("ENET%d: local-mac-address <-"
108 " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
109 addr[0], addr[1], addr[2],
110 addr[3], addr[4], addr[5]);
111
112 setprop(devp, "local-mac-address", addr, 6);
113 }
114}
115
116void __dt_fixup_mac_addresses(u32 startindex, ...)
117{
118 va_list ap;
119 u32 index = startindex;
120 const u8 *addr;
121
122 va_start(ap, startindex);
123
124 while ((addr = va_arg(ap, const u8 *)))
125 dt_fixup_mac_address(index++, addr);
126
127 va_end(ap);
128}
129
130#define MAX_ADDR_CELLS 4
131
132void dt_get_reg_format(void *node, u32 *naddr, u32 *nsize)
133{
134 if (getprop(node, "#address-cells", naddr, 4) != 4)
135 *naddr = 2;
136 if (getprop(node, "#size-cells", nsize, 4) != 4)
137 *nsize = 1;
138}
139
140static void copy_val(u32 *dest, u32 *src, int naddr)
141{
142 int pad = MAX_ADDR_CELLS - naddr;
143
144 memset(dest, 0, pad * 4);
145 memcpy(dest + pad, src, naddr * 4);
146}
147
148static int sub_reg(u32 *reg, u32 *sub)
149{
150 int i, borrow = 0;
151
152 for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) {
153 int prev_borrow = borrow;
154 borrow = reg[i] < sub[i] + prev_borrow;
155 reg[i] -= sub[i] + prev_borrow;
156 }
157
158 return !borrow;
159}
160
161static int add_reg(u32 *reg, u32 *add, int naddr)
162{
163 int i, carry = 0;
164
165 for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) {
166 u64 tmp = (u64)reg[i] + add[i] + carry;
167 carry = tmp >> 32;
168 reg[i] = (u32)tmp;
169 }
170
171 return !carry;
172}
173
174/* It is assumed that if the first byte of reg fits in a
175 * range, then the whole reg block fits.
176 */
177static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
178{
179 int i;
180 u32 end;
181
182 for (i = 0; i < MAX_ADDR_CELLS; i++) {
183 if (reg[i] < range[i])
184 return 0;
185 if (reg[i] > range[i])
186 break;
187 }
188
189 for (i = 0; i < MAX_ADDR_CELLS; i++) {
190 end = range[i] + rangesize[i];
191
192 if (reg[i] < end)
193 break;
194 if (reg[i] > end)
195 return 0;
196 }
197
198 return reg[i] != end;
199}
200
201/* reg must be MAX_ADDR_CELLS */
202static int find_range(u32 *reg, u32 *ranges, int nregaddr,
203 int naddr, int nsize, int buflen)
204{
205 int nrange = nregaddr + naddr + nsize;
206 int i;
207
208 for (i = 0; i + nrange <= buflen; i += nrange) {
209 u32 range_addr[MAX_ADDR_CELLS];
210 u32 range_size[MAX_ADDR_CELLS];
211
212 copy_val(range_addr, ranges + i, nregaddr);
213 copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
214
215 if (compare_reg(reg, range_addr, range_size))
216 return i;
217 }
218
219 return -1;
220}
221
222/* Currently only generic buses without special encodings are supported.
223 * In particular, PCI is not supported. Also, only the beginning of the
224 * reg block is tracked; size is ignored except in ranges.
225 */
226static u32 prop_buf[MAX_PROP_LEN / 4];
227
228static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
229 unsigned long *size)
230{
231 u32 last_addr[MAX_ADDR_CELLS];
232 u32 this_addr[MAX_ADDR_CELLS];
233 void *parent;
234 u64 ret_addr, ret_size;
235 u32 naddr, nsize, prev_naddr, prev_nsize;
236 int buflen, offset;
237
238 parent = get_parent(node);
239 if (!parent)
240 return 0;
241
242 dt_get_reg_format(parent, &naddr, &nsize);
243
244 if (nsize > 2)
245 return 0;
246
247 offset = (naddr + nsize) * res;
248
249 if (reglen < offset + naddr + nsize ||
250 MAX_PROP_LEN < (offset + naddr + nsize) * 4)
251 return 0;
252
253 copy_val(last_addr, prop_buf + offset, naddr);
254
255 ret_size = prop_buf[offset + naddr];
256 if (nsize == 2) {
257 ret_size <<= 32;
258 ret_size |= prop_buf[offset + naddr + 1];
259 }
260
261 for (;;) {
262 prev_naddr = naddr;
263 prev_nsize = nsize;
264 node = parent;
265
266 parent = get_parent(node);
267 if (!parent)
268 break;
269
270 dt_get_reg_format(parent, &naddr, &nsize);
271
272 buflen = getprop(node, "ranges", prop_buf,
273 sizeof(prop_buf));
274 if (buflen == 0)
275 continue;
276 if (buflen < 0 || buflen > sizeof(prop_buf))
277 return 0;
278
279 offset = find_range(last_addr, prop_buf, prev_naddr,
280 naddr, prev_nsize, buflen / 4);
281
282 if (offset < 0)
283 return 0;
284
285 copy_val(this_addr, prop_buf + offset, prev_naddr);
286
287 if (!sub_reg(last_addr, this_addr))
288 return 0;
289
290 copy_val(this_addr, prop_buf + offset + prev_naddr, naddr);
291
292 if (!add_reg(last_addr, this_addr, naddr))
293 return 0;
294 }
295
296 if (naddr > 2)
297 return 0;
298
299 ret_addr = ((u64)last_addr[2] << 32) | last_addr[3];
300
301 if (sizeof(void *) == 4 &&
302 (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
303 ret_addr + ret_size > 0x100000000ULL))
304 return 0;
305
306 *addr = ret_addr;
307 if (size)
308 *size = ret_size;
309
310 return 1;
311}
312
313int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
314{
315 int reglen;
316
317 reglen = getprop(node, "reg", prop_buf, sizeof(prop_buf)) / 4;
318 return dt_xlate(node, res, reglen, addr, size);
319}
320
321int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
322{
323
324 if (buflen > sizeof(prop_buf))
325 return 0;
326
327 memcpy(prop_buf, buf, buflen);
328 return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
329}
330
331int dt_is_compatible(void *node, const char *compat)
332{
333 char *buf = (char *)prop_buf;
334 int len, pos;
335
336 len = getprop(node, "compatible", buf, MAX_PROP_LEN);
337 if (len < 0)
338 return 0;
339
340 for (pos = 0; pos < len; pos++) {
341 if (!strcmp(buf + pos, compat))
342 return 1;
343
344 pos += strnlen(&buf[pos], len - pos);
345 }
346
347 return 0;
348}
349
350int dt_get_virtual_reg(void *node, void **addr, int nres)
351{
352 unsigned long xaddr;
353 int n;
354
355 n = getprop(node, "virtual-reg", addr, nres * 4);
356 if (n > 0)
357 return n / 4;
358
359 for (n = 0; n < nres; n++) {
360 if (!dt_xlate_reg(node, n, &xaddr, NULL))
361 break;
362
363 addr[n] = (void *)xaddr;
364 }
365
366 return n;
367}
368