1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * RedBoot firmware support
4 *
5 * Author: Scott Wood <scottwood@freescale.com>
6 *
7 * Copyright (c) 2007 Freescale Semiconductor, Inc.
8 * Copyright (c) 2008 Codehermit
9 */
10
11#include "ops.h"
12#include "stdio.h"
13#include "redboot.h"
14#include "fsl-soc.h"
15#include "io.h"
16
17static bd_t bd;
18BSS_STACK(4096);
19
20#define MHZ(x) ((x + 500000) / 1000000)
21
22static void platform_fixups(void)
23{
24 void *node;
25
26 dt_fixup_memory(start: bd.bi_memstart, size: bd.bi_memsize);
27 dt_fixup_mac_addresses(bd.bi_enetaddr);
28 dt_fixup_cpu_clocks(cpufreq: bd.bi_intfreq, tbfreq: bd.bi_busfreq / 16, busfreq: bd.bi_busfreq);
29
30 node = finddevice(name: "/soc/cpm/brg");
31 if (node) {
32 printf(fmt: "BRG clock-frequency <- 0x%x (%dMHz)\r\n",
33 bd.bi_busfreq, MHZ(bd.bi_busfreq));
34 setprop(devp: node, name: "clock-frequency", buf: &bd.bi_busfreq, buflen: 4);
35 }
36
37}
38
39void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
40 unsigned long r6, unsigned long r7)
41{
42 memcpy(dest: &bd, src: (char *)r3, n: sizeof(bd));
43
44 if (bd.bi_tag != 0x42444944)
45 return;
46
47 simple_alloc_init(base: _end,
48 heap_size: bd.bi_memstart + bd.bi_memsize - (unsigned long)_end,
49 granularity: 32, max_allocs: 64);
50
51 fdt_init(blob: _dtb_start);
52 serial_console_init();
53 platform_ops.fixups = platform_fixups;
54
55 loader_info.cmdline = (char *)bd.bi_cmdline;
56 loader_info.cmdline_len = strlen((char *)bd.bi_cmdline);
57}
58

source code of linux/arch/powerpc/boot/redboot-83xx.c