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 u64 __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 49 { 50 return virt_to_phys( 51 __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS)) 52 ); 53 } 54 55 #ifdef CONFIG_BLK_DEV_INITRD 56 void __init early_init_dt_setup_initrd_arch(unsigned long start, 57 unsigned long end) 58 { 59 initrd_start = (unsigned long)__va(start); 60 initrd_end = (unsigned long)__va(end); 61 initrd_below_start_ok = 1; 62 } 63 #endif 64 65 /* 66 * irq_create_of_mapping - Hook to resolve OF irq specifier into a Linux irq# 67 * 68 * Currently the mapping mechanism is trivial; simple flat hwirq numbers are 69 * mapped 1:1 onto Linux irq numbers. Cascaded irq controllers are not 70 * supported. 71 */ 72 unsigned int irq_create_of_mapping(struct device_node *controller, 73 const u32 *intspec, unsigned int intsize) 74 { 75 return intspec[0]; 76 } 77 EXPORT_SYMBOL_GPL(irq_create_of_mapping); 78 79 void __init early_init_devtree(void *params) 80 { 81 /* Setup flat device-tree pointer */ 82 initial_boot_params = params; 83 84 /* Retrieve various informations from the /chosen node of the 85 * device-tree, including the platform type, initrd location and 86 * size, and more ... 87 */ 88 of_scan_flat_dt(early_init_dt_scan_chosen, NULL); 89 90 /* Scan memory nodes */ 91 of_scan_flat_dt(early_init_dt_scan_root, NULL); 92 of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL); 93 } 94 95 void __init device_tree_init(void) 96 { 97 unsigned long base, size; 98 99 if (!initial_boot_params) 100 return; 101 102 base = virt_to_phys((void *)initial_boot_params); 103 size = be32_to_cpu(initial_boot_params->totalsize); 104 105 /* Before we do anything, lets reserve the dt blob */ 106 reserve_mem_mach(base, size); 107 108 unflatten_device_tree(); 109 110 /* free the space reserved for the dt blob */ 111 free_mem_mach(base, size); 112 } 113