Dezhong Diao | f2ffa5a | 2010-10-13 00:52:46 -0600 | [diff] [blame] | 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); |
Thomas Chou | e31fee7 | 2010-11-24 15:35:48 +0800 | [diff] [blame^] | 103 | size = be32_to_cpu(initial_boot_params->totalsize); |
Dezhong Diao | f2ffa5a | 2010-10-13 00:52:46 -0600 | [diff] [blame] | 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 | } |