powerpc/boot/redboot-83xx.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * RedBoot firmware support
0004  *
0005  * Author: Scott Wood <scottwood@freescale.com>
0006  *
0007  * Copyright (c) 2007 Freescale Semiconductor, Inc.
0008  * Copyright (c) 2008 Codehermit
0009  */
0010
0011 #include "ops.h"
0012 #include "stdio.h"
0013 #include "redboot.h"
0014 #include "fsl-soc.h"
0015 #include "io.h"
0016
0017 static bd_t bd;
0018 BSS_STACK(4096);
0019
0020 #define MHZ(x)  ((x + 500000) / 1000000)
0021
0022 static void platform_fixups(void)
0023 {
0024     void *node;
0025
0026     dt_fixup_memory(bd.bi_memstart, bd.bi_memsize);
0027     dt_fixup_mac_addresses(bd.bi_enetaddr);
0028     dt_fixup_cpu_clocks(bd.bi_intfreq, bd.bi_busfreq / 16, bd.bi_busfreq);
0029
0030     node = finddevice("/soc/cpm/brg");
0031     if (node) {
0032         printf("BRG clock-frequency <- 0x%x (%dMHz)\r\n",
0033                bd.bi_busfreq, MHZ(bd.bi_busfreq));
0034         setprop(node, "clock-frequency",  &bd.bi_busfreq, 4);
0035     }
0036
0037 }
0038
0039 void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
0040            unsigned long r6, unsigned long r7)
0041 {
0042     memcpy(&bd, (char *)r3, sizeof(bd));
0043
0044     if (bd.bi_tag != 0x42444944)
0045         return;
0046
0047     simple_alloc_init(_end,
0048               bd.bi_memstart + bd.bi_memsize - (unsigned long)_end,
0049               32, 64);
0050
0051     fdt_init(_dtb_start);
0052     serial_console_init();
0053     platform_ops.fixups = platform_fixups;
0054
0055     loader_info.cmdline = (char *)bd.bi_cmdline;
0056     loader_info.cmdline_len = strlen((char *)bd.bi_cmdline);
0057 }