2 * MIPS support for CONFIG_OF device tree support
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.
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>
19 #include <linux/of_fdt.h>
20 #include <linux/of_irq.h>
21 #include <linux/of_platform.h>
26 int __init early_init_dt_scan_memory_arch(unsigned long node,
27 const char *uname, int depth,
30 return early_init_dt_scan_memory(node, uname, depth, data);
33 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
35 return add_memory_region(base, size, BOOT_MEM_RAM);
38 int __init reserve_mem_mach(unsigned long addr, unsigned long size)
40 return reserve_bootmem(addr, size, BOOTMEM_DEFAULT);
43 void __init free_mem_mach(unsigned long addr, unsigned long size)
45 return free_bootmem(addr, size);
48 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
50 return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
53 #ifdef CONFIG_BLK_DEV_INITRD
54 void __init early_init_dt_setup_initrd_arch(unsigned long start,
57 initrd_start = (unsigned long)__va(start);
58 initrd_end = (unsigned long)__va(end);
59 initrd_below_start_ok = 1;
64 * irq_create_of_mapping - Hook to resolve OF irq specifier into a Linux irq#
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
70 unsigned int irq_create_of_mapping(struct device_node *controller,
71 const u32 *intspec, unsigned int intsize)
75 EXPORT_SYMBOL_GPL(irq_create_of_mapping);
77 void __init early_init_devtree(void *params)
79 /* Setup flat device-tree pointer */
80 initial_boot_params = params;
82 /* Retrieve various informations from the /chosen node of the
83 * device-tree, including the platform type, initrd location and
86 of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);
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);
94 void __init device_tree_init(void)
96 unsigned long base, size;
98 if (!initial_boot_params)
101 base = virt_to_phys((void *)initial_boot_params);
102 size = be32_to_cpu(initial_boot_params->totalsize);
104 /* Before we do anything, lets reserve the dt blob */
105 reserve_mem_mach(base, size);
107 unflatten_device_tree();
109 /* free the space reserved for the dt blob */
110 free_mem_mach(base, size);