1/* 2 * The simple platform -- for booting when firmware doesn't supply a device 3 * tree or any platform configuration information. 4 * All data is extracted from an embedded device tree 5 * blob. 6 * 7 * Authors: Scott Wood <scottwood@freescale.com> 8 * Grant Likely <grant.likely@secretlab.ca> 9 * 10 * Copyright (c) 2007 Freescale Semiconductor, Inc. 11 * Copyright (c) 2008 Secret Lab Technologies Ltd. 12 * 13 * This program is free software; you can redistribute it and/or modify it 14 * under the terms of the GNU General Public License version 2 as published 15 * by the Free Software Foundation. 16 */ 17 18#include "ops.h" 19#include "types.h" 20#include "io.h" 21#include "stdio.h" 22#include <libfdt.h> 23 24BSS_STACK(4*1024); 25 26extern int platform_specific_init(void) __attribute__((weak)); 27 28void platform_init(unsigned long r3, unsigned long r4, unsigned long r5, 29 unsigned long r6, unsigned long r7) 30{ 31 const u32 *na, *ns, *reg, *timebase; 32 u64 memsize64; 33 int node, size, i; 34 35 /* Make sure FDT blob is sane */ 36 if (fdt_check_header(_dtb_start) != 0) 37 fatal("Invalid device tree blob\n"); 38 39 /* Find the #address-cells and #size-cells properties */ 40 node = fdt_path_offset(_dtb_start, "/"); 41 if (node < 0) 42 fatal("Cannot find root node\n"); 43 na = fdt_getprop(_dtb_start, node, "#address-cells", &size); 44 if (!na || (size != 4)) 45 fatal("Cannot find #address-cells property"); 46 ns = fdt_getprop(_dtb_start, node, "#size-cells", &size); 47 if (!ns || (size != 4)) 48 fatal("Cannot find #size-cells property"); 49 50 /* Find the memory range */ 51 node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type", 52 "memory", sizeof("memory")); 53 if (node < 0) 54 fatal("Cannot find memory node\n"); 55 reg = fdt_getprop(_dtb_start, node, "reg", &size); 56 if (size < (*na+*ns) * sizeof(u32)) 57 fatal("cannot get memory range\n"); 58 59 /* Only interested in memory based at 0 */ 60 for (i = 0; i < *na; i++) 61 if (*reg++ != 0) 62 fatal("Memory range is not based at address 0\n"); 63 64 /* get the memsize and trucate it to under 4G on 32 bit machines */ 65 memsize64 = 0; 66 for (i = 0; i < *ns; i++) 67 memsize64 = (memsize64 << 32) | *reg++; 68 if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL) 69 memsize64 = 0xffffffff; 70 71 /* finally, setup the timebase */ 72 node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type", 73 "cpu", sizeof("cpu")); 74 if (!node) 75 fatal("Cannot find cpu node\n"); 76 timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size); 77 if (timebase && (size == 4)) 78 timebase_period_ns = 1000000000 / *timebase; 79 80 /* Now we have the memory size; initialize the heap */ 81 simple_alloc_init(_end, memsize64 - (unsigned long)_end, 32, 64); 82 83 /* prepare the device tree and find the console */ 84 fdt_init(_dtb_start); 85 86 if (platform_specific_init) 87 platform_specific_init(); 88 89 serial_console_init(); 90} 91