2 * devtree.c - convenience functions for device tree manipulation
3 * Copyright 2007 David Gibson, IBM Corporation.
4 * Copyright (c) 2007 Freescale Semiconductor, Inc.
6 * Authors: David Gibson <david@gibson.dropbear.id.au>
7 * Scott Wood <scottwood@freescale.com>
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.
22 void dt_fixup_memory(u64 start, u64 size)
28 root = finddevice("/");
29 if (getprop(root, "#address-cells", &naddr, sizeof(naddr)) < 0)
32 naddr = be32_to_cpu(naddr);
33 if (naddr < 1 || naddr > 2)
34 fatal("Can't cope with #address-cells == %d in /\n\r", naddr);
36 if (getprop(root, "#size-cells", &nsize, sizeof(nsize)) < 0)
39 nsize = be32_to_cpu(nsize);
40 if (nsize < 1 || nsize > 2)
41 fatal("Can't cope with #size-cells == %d in /\n\r", nsize);
45 memreg[i++] = cpu_to_be32(start >> 32);
46 memreg[i++] = cpu_to_be32(start & 0xffffffff);
48 memreg[i++] = cpu_to_be32(size >> 32);
49 memreg[i++] = cpu_to_be32(size & 0xffffffff);
51 memory = finddevice("/memory");
53 memory = create_node(NULL, "memory");
54 setprop_str(memory, "device_type", "memory");
57 printf("Memory <- <0x%x", be32_to_cpu(memreg[0]));
58 for (i = 1; i < (naddr + nsize); i++)
59 printf(" 0x%x", be32_to_cpu(memreg[i]));
60 printf("> (%ldMB)\n\r", (unsigned long)(size >> 20));
62 setprop(memory, "reg", memreg, (naddr + nsize)*sizeof(u32));
65 #define MHZ(x) ((x + 500000) / 1000000)
67 void dt_fixup_cpu_clocks(u32 cpu, u32 tb, u32 bus)
71 printf("CPU clock-frequency <- 0x%x (%dMHz)\n\r", cpu, MHZ(cpu));
72 printf("CPU timebase-frequency <- 0x%x (%dMHz)\n\r", tb, MHZ(tb));
74 printf("CPU bus-frequency <- 0x%x (%dMHz)\n\r", bus, MHZ(bus));
76 while ((devp = find_node_by_devtype(devp, "cpu"))) {
77 setprop_val(devp, "clock-frequency", cpu_to_be32(cpu));
78 setprop_val(devp, "timebase-frequency", cpu_to_be32(tb));
80 setprop_val(devp, "bus-frequency", cpu_to_be32(bus));
83 timebase_period_ns = 1000000000 / tb;
86 void dt_fixup_clock(const char *path, u32 freq)
88 void *devp = finddevice(path);
91 printf("%s: clock-frequency <- %x (%dMHz)\n\r", path, freq, MHZ(freq));
92 setprop_val(devp, "clock-frequency", cpu_to_be32(freq));
96 void dt_fixup_mac_address_by_alias(const char *alias, const u8 *addr)
98 void *devp = find_node_by_alias(alias);
101 printf("%s: local-mac-address <-"
102 " %02x:%02x:%02x:%02x:%02x:%02x\n\r", alias,
103 addr[0], addr[1], addr[2],
104 addr[3], addr[4], addr[5]);
106 setprop(devp, "local-mac-address", addr, 6);
110 void dt_fixup_mac_address(u32 index, const u8 *addr)
112 void *devp = find_node_by_prop_value(NULL, "linux,network-index",
113 (void*)&index, sizeof(index));
116 printf("ENET%d: local-mac-address <-"
117 " %02x:%02x:%02x:%02x:%02x:%02x\n\r", index,
118 addr[0], addr[1], addr[2],
119 addr[3], addr[4], addr[5]);
121 setprop(devp, "local-mac-address", addr, 6);
125 void __dt_fixup_mac_addresses(u32 startindex, ...)
128 u32 index = startindex;
131 va_start(ap, startindex);
133 while ((addr = va_arg(ap, const u8 *)))
134 dt_fixup_mac_address(index++, addr);
139 #define MAX_ADDR_CELLS 4
141 void dt_get_reg_format(void *node, u32 *naddr, u32 *nsize)
143 if (getprop(node, "#address-cells", naddr, 4) != 4)
146 *naddr = be32_to_cpu(*naddr);
147 if (getprop(node, "#size-cells", nsize, 4) != 4)
150 *nsize = be32_to_cpu(*nsize);
153 static void copy_val(u32 *dest, u32 *src, int naddr)
155 int pad = MAX_ADDR_CELLS - naddr;
157 memset(dest, 0, pad * 4);
158 memcpy(dest + pad, src, naddr * 4);
161 static int sub_reg(u32 *reg, u32 *sub)
165 for (i = MAX_ADDR_CELLS - 1; i >= 0; i--) {
166 int prev_borrow = borrow;
167 borrow = reg[i] < sub[i] + prev_borrow;
168 reg[i] -= sub[i] + prev_borrow;
174 static int add_reg(u32 *reg, u32 *add, int naddr)
178 for (i = MAX_ADDR_CELLS - 1; i >= MAX_ADDR_CELLS - naddr; i--) {
179 u64 tmp = (u64)be32_to_cpu(reg[i]) + be32_to_cpu(add[i]) + carry;
181 reg[i] = cpu_to_be32((u32)tmp);
187 /* It is assumed that if the first byte of reg fits in a
188 * range, then the whole reg block fits.
190 static int compare_reg(u32 *reg, u32 *range, u32 *rangesize)
195 for (i = 0; i < MAX_ADDR_CELLS; i++) {
196 if (be32_to_cpu(reg[i]) < be32_to_cpu(range[i]))
198 if (be32_to_cpu(reg[i]) > be32_to_cpu(range[i]))
202 for (i = 0; i < MAX_ADDR_CELLS; i++) {
203 end = be32_to_cpu(range[i]) + be32_to_cpu(rangesize[i]);
205 if (be32_to_cpu(reg[i]) < end)
207 if (be32_to_cpu(reg[i]) > end)
211 return reg[i] != end;
214 /* reg must be MAX_ADDR_CELLS */
215 static int find_range(u32 *reg, u32 *ranges, int nregaddr,
216 int naddr, int nsize, int buflen)
218 int nrange = nregaddr + naddr + nsize;
221 for (i = 0; i + nrange <= buflen; i += nrange) {
222 u32 range_addr[MAX_ADDR_CELLS];
223 u32 range_size[MAX_ADDR_CELLS];
225 copy_val(range_addr, ranges + i, nregaddr);
226 copy_val(range_size, ranges + i + nregaddr + naddr, nsize);
228 if (compare_reg(reg, range_addr, range_size))
235 /* Currently only generic buses without special encodings are supported.
236 * In particular, PCI is not supported. Also, only the beginning of the
237 * reg block is tracked; size is ignored except in ranges.
239 static u32 prop_buf[MAX_PROP_LEN / 4];
241 static int dt_xlate(void *node, int res, int reglen, unsigned long *addr,
244 u32 last_addr[MAX_ADDR_CELLS];
245 u32 this_addr[MAX_ADDR_CELLS];
247 u64 ret_addr, ret_size;
248 u32 naddr, nsize, prev_naddr, prev_nsize;
251 parent = get_parent(node);
255 dt_get_reg_format(parent, &naddr, &nsize);
259 offset = (naddr + nsize) * res;
261 if (reglen < offset + naddr + nsize ||
262 MAX_PROP_LEN < (offset + naddr + nsize) * 4)
265 copy_val(last_addr, prop_buf + offset, naddr);
267 ret_size = be32_to_cpu(prop_buf[offset + naddr]);
270 ret_size |= be32_to_cpu(prop_buf[offset + naddr + 1]);
278 parent = get_parent(node);
282 dt_get_reg_format(parent, &naddr, &nsize);
284 buflen = getprop(node, "ranges", prop_buf,
288 if (buflen < 0 || buflen > sizeof(prop_buf))
291 offset = find_range(last_addr, prop_buf, prev_naddr,
292 naddr, prev_nsize, buflen / 4);
296 copy_val(this_addr, prop_buf + offset, prev_naddr);
298 if (!sub_reg(last_addr, this_addr))
301 copy_val(this_addr, prop_buf + offset + prev_naddr, naddr);
303 if (!add_reg(last_addr, this_addr, naddr))
310 ret_addr = ((u64)be32_to_cpu(last_addr[2]) << 32) | be32_to_cpu(last_addr[3]);
311 if (sizeof(void *) == 4 &&
312 (ret_addr >= 0x100000000ULL || ret_size > 0x100000000ULL ||
313 ret_addr + ret_size > 0x100000000ULL))
323 int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size)
327 reglen = getprop(node, "reg", prop_buf, sizeof(prop_buf)) / 4;
328 return dt_xlate(node, res, reglen, addr, size);
331 int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr)
334 if (buflen > sizeof(prop_buf))
337 memcpy(prop_buf, buf, buflen);
338 return dt_xlate(node, 0, buflen / 4, xlated_addr, NULL);
341 int dt_is_compatible(void *node, const char *compat)
343 char *buf = (char *)prop_buf;
346 len = getprop(node, "compatible", buf, MAX_PROP_LEN);
350 for (pos = 0; pos < len; pos++) {
351 if (!strcmp(buf + pos, compat))
354 pos += strnlen(&buf[pos], len - pos);
360 int dt_get_virtual_reg(void *node, void **addr, int nres)
365 n = getprop(node, "virtual-reg", addr, nres * 4);
367 for (i = 0; i < n/4; i ++)
368 ((u32 *)addr)[i] = be32_to_cpu(((u32 *)addr)[i]);
372 for (n = 0; n < nres; n++) {
373 if (!dt_xlate_reg(node, n, &xaddr, NULL))
376 addr[n] = (void *)xaddr;