powerpc/boot/treeboot-iss4xx.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright 2010 Ben. Herrenschmidt, IBM Corporation.
0004  *
0005  * Based on earlier code:
0006  *   Copyright (C) Paul Mackerras 1997.
0007  *
0008  *   Matt Porter <mporter@kernel.crashing.org>
0009  *   Copyright 2002-2005 MontaVista Software Inc.
0010  *
0011  *   Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
0012  *   Copyright (c) 2003, 2004 Zultys Technologies
0013  *
0014  *    Copyright 2007 David Gibson, IBM Corporation.
0015  */
0016 #include <stdarg.h>
0017 #include <stddef.h>
0018 #include "types.h"
0019 #include "elf.h"
0020 #include "string.h"
0021 #include "stdio.h"
0022 #include "page.h"
0023 #include "ops.h"
0024 #include "reg.h"
0025 #include "io.h"
0026 #include "dcr.h"
0027 #include "4xx.h"
0028 #include "44x.h"
0029 #include "libfdt.h"
0030
0031 BSS_STACK(4096);
0032
0033 static u32 ibm4xx_memstart;
0034
0035 static void iss_4xx_fixups(void)
0036 {
0037     void *memory;
0038     u32 reg[3];
0039
0040     memory = finddevice("/memory");
0041     if (!memory)
0042         fatal("Can't find memory node\n");
0043     /* This assumes #address-cells = 2, #size-cells =1 and that */
0044     getprop(memory, "reg", reg, sizeof(reg));
0045     if (reg[2])
0046         /* If the device tree specifies the memory range, use it */
0047         ibm4xx_memstart = reg[1];
0048     else
0049         /* othersize, read it from the SDRAM controller */
0050         ibm4xx_sdram_fixup_memsize();
0051 }
0052
0053 static void *iss_4xx_vmlinux_alloc(unsigned long size)
0054 {
0055     return (void *)ibm4xx_memstart;
0056 }
0057
0058 #define SPRN_PIR    0x11E   /* Processor Identification Register */
0059 void platform_init(void)
0060 {
0061     unsigned long end_of_ram = 0x08000000;
0062     unsigned long avail_ram = end_of_ram - (unsigned long)_end;
0063     u32 pir_reg;
0064
0065     simple_alloc_init(_end, avail_ram, 128, 64);
0066     platform_ops.fixups = iss_4xx_fixups;
0067     platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc;
0068     platform_ops.exit = ibm44x_dbcr_reset;
0069     pir_reg = mfspr(SPRN_PIR);
0070     fdt_set_boot_cpuid_phys(_dtb_start, pir_reg);
0071     fdt_init(_dtb_start);
0072     serial_console_init();
0073 }