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/module.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 int __init reserve_mem_mach(unsigned long addr, unsigned long size) 39 { 40 return reserve_bootmem(addr, size, BOOTMEM_DEFAULT); 41 } 42 43 void __init free_mem_mach(unsigned long addr, unsigned long size) 44 { 45 return free_bootmem(addr, size); 46 } 47 48 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 49 { 50 return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS)); 51 } 52 53 #ifdef CONFIG_BLK_DEV_INITRD 54 void __init early_init_dt_setup_initrd_arch(unsigned long start, 55 unsigned long end) 56 { 57 initrd_start = (unsigned long)__va(start); 58 initrd_end = (unsigned long)__va(end); 59 initrd_below_start_ok = 1; 60 } 61 #endif 62 63 /* 64 * irq_create_of_mapping - Hook to resolve OF irq specifier into a Linux irq# 65 * 66 * Currently the mapping mechanism is trivial; simple flat hwirq numbers are 67 * mapped 1:1 onto Linux irq numbers. Cascaded irq controllers are not 68 * supported. 69 */ 70 unsigned int irq_create_of_mapping(struct device_node *controller, 71 const u32 *intspec, unsigned int intsize) 72 { 73 return intspec[0]; 74 } 75 EXPORT_SYMBOL_GPL(irq_create_of_mapping); 76 77 void __init early_init_devtree(void *params) 78 { 79 /* Setup flat device-tree pointer */ 80 initial_boot_params = params; 81 82 /* Retrieve various informations from the /chosen node of the 83 * device-tree, including the platform type, initrd location and 84 * size, and more ... 85 */ 86 of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline); 87 88 89 /* Scan memory nodes */ 90 of_scan_flat_dt(early_init_dt_scan_root, NULL); 91 of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL); 92 } 93 94 void __init device_tree_init(void) 95 { 96 unsigned long base, size; 97 98 if (!initial_boot_params) 99 return; 100 101 base = virt_to_phys((void *)initial_boot_params); 102 size = be32_to_cpu(initial_boot_params->totalsize); 103 104 /* Before we do anything, lets reserve the dt blob */ 105 reserve_mem_mach(base, size); 106 107 unflatten_device_tree(); 108 109 /* free the space reserved for the dt blob */ 110 free_mem_mach(base, size); 111 } 112