1 /* 2 * Copyright 2010 Ben. Herrenschmidt, IBM Corporation. 3 * 4 * Based on earlier code: 5 * Copyright (C) Paul Mackerras 1997. 6 * 7 * Matt Porter <mporter@kernel.crashing.org> 8 * Copyright 2002-2005 MontaVista Software Inc. 9 * 10 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> 11 * Copyright (c) 2003, 2004 Zultys Technologies 12 * 13 * Copyright 2007 David Gibson, IBM Corporation. 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 #include <stdarg.h> 21 #include <stddef.h> 22 #include "types.h" 23 #include "elf.h" 24 #include "string.h" 25 #include "stdio.h" 26 #include "page.h" 27 #include "ops.h" 28 #include "reg.h" 29 #include "io.h" 30 #include "dcr.h" 31 #include "4xx.h" 32 #include "44x.h" 33 #include "libfdt.h" 34 35 BSS_STACK(4096); 36 37 static u32 ibm4xx_memstart; 38 39 static void iss_4xx_fixups(void) 40 { 41 void *memory; 42 u32 reg[3]; 43 44 memory = finddevice("/memory"); 45 if (!memory) 46 fatal("Can't find memory node\n"); 47 /* This assumes #address-cells = 2, #size-cells =1 and that */ 48 getprop(memory, "reg", reg, sizeof(reg)); 49 if (reg[2]) 50 /* If the device tree specifies the memory range, use it */ 51 ibm4xx_memstart = reg[1]; 52 else 53 /* othersize, read it from the SDRAM controller */ 54 ibm4xx_sdram_fixup_memsize(); 55 } 56 57 static void *iss_4xx_vmlinux_alloc(unsigned long size) 58 { 59 return (void *)ibm4xx_memstart; 60 } 61 62 #define SPRN_PIR 0x11E /* Processor Indentification Register */ 63 void platform_init(void) 64 { 65 unsigned long end_of_ram = 0x08000000; 66 unsigned long avail_ram = end_of_ram - (unsigned long)_end; 67 u32 pir_reg; 68 69 simple_alloc_init(_end, avail_ram, 128, 64); 70 platform_ops.fixups = iss_4xx_fixups; 71 platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc; 72 platform_ops.exit = ibm44x_dbcr_reset; 73 pir_reg = mfspr(SPRN_PIR); 74 fdt_set_boot_cpuid_phys(_dtb_start, pir_reg); 75 fdt_init(_dtb_start); 76 serial_console_init(); 77 } 78