1 /* 2 * MIPS support for CONFIG_OF device tree support 3 * 4 * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 11 #include <linux/init.h> 12 #include <linux/export.h> 13 #include <linux/errno.h> 14 #include <linux/types.h> 15 #include <linux/bootmem.h> 16 #include <linux/initrd.h> 17 #include <linux/debugfs.h> 18 #include <linux/of.h> 19 #include <linux/of_fdt.h> 20 #include <linux/of_irq.h> 21 #include <linux/of_platform.h> 22 23 #include <asm/page.h> 24 #include <asm/prom.h> 25 26 int __init early_init_dt_scan_memory_arch(unsigned long node, 27 const char *uname, int depth, 28 void *data) 29 { 30 return early_init_dt_scan_memory(node, uname, depth, data); 31 } 32 33 void __init early_init_dt_add_memory_arch(u64 base, u64 size) 34 { 35 return add_memory_region(base, size, BOOT_MEM_RAM); 36 } 37 38 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 39 { 40 return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS)); 41 } 42 43 #ifdef CONFIG_BLK_DEV_INITRD 44 void __init early_init_dt_setup_initrd_arch(unsigned long start, 45 unsigned long end) 46 { 47 initrd_start = (unsigned long)__va(start); 48 initrd_end = (unsigned long)__va(end); 49 initrd_below_start_ok = 1; 50 } 51 #endif 52 53 void __init early_init_devtree(void *params) 54 { 55 /* Setup flat device-tree pointer */ 56 initial_boot_params = params; 57 58 /* Retrieve various informations from the /chosen node of the 59 * device-tree, including the platform type, initrd location and 60 * size, and more ... 61 */ 62 of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline); 63 64 65 /* Scan memory nodes */ 66 of_scan_flat_dt(early_init_dt_scan_root, NULL); 67 of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL); 68 } 69 70 void __init __dt_setup_arch(struct boot_param_header *bph) 71 { 72 if (be32_to_cpu(bph->magic) != OF_DT_HEADER) { 73 pr_err("DTB has bad magic, ignoring builtin OF DTB\n"); 74 75 return; 76 } 77 78 initial_boot_params = bph; 79 80 early_init_devtree(initial_boot_params); 81 } 82