2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License version 2 as published
4 * by the Free Software Foundation.
6 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
8 * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
12 #include <linux/clk.h>
13 #include <linux/init.h>
14 #include <linux/sizes.h>
15 #include <linux/of_fdt.h>
16 #include <linux/kernel.h>
17 #include <linux/bootmem.h>
18 #include <linux/of_platform.h>
19 #include <linux/of_address.h>
21 #include <asm/reboot.h>
22 #include <asm/bootinfo.h>
23 #include <asm/addrspace.h>
27 __iomem
void *rt_sysc_membase
;
28 __iomem
void *rt_memc_membase
;
30 extern struct boot_param_header __dtb_start
;
32 __iomem
void *plat_of_remap_node(const char *node
)
35 struct device_node
*np
;
37 np
= of_find_compatible_node(NULL
, NULL
, node
);
39 panic("Failed to find %s node", node
);
41 if (of_address_to_resource(np
, 0, &res
))
42 panic("Failed to get resource for %s", node
);
44 if ((request_mem_region(res
.start
,
47 panic("Failed to request resources for %s", node
);
49 return ioremap_nocache(res
.start
, resource_size(&res
));
52 void __init
device_tree_init(void)
54 unsigned long base
, size
;
57 if (!initial_boot_params
)
60 base
= virt_to_phys((void *)initial_boot_params
);
61 size
= be32_to_cpu(initial_boot_params
->totalsize
);
63 /* Before we do anything, lets reserve the dt blob */
64 reserve_bootmem(base
, size
, BOOTMEM_DEFAULT
);
66 /* The strings in the flattened tree are referenced directly by the
67 * device tree, so copy the flattened device tree from init memory
70 fdt_copy
= alloc_bootmem(size
);
71 memcpy(fdt_copy
, initial_boot_params
, size
);
72 initial_boot_params
= fdt_copy
;
74 unflatten_device_tree();
76 /* free the space reserved for the dt blob */
77 free_bootmem(base
, size
);
80 void __init
plat_mem_setup(void)
82 set_io_port_base(KSEG1
);
85 * Load the builtin devicetree. This causes the chosen node to be
86 * parsed resulting in our memory appearing
88 __dt_setup_arch(&__dtb_start
);
90 if (soc_info
.mem_size
)
91 add_memory_region(soc_info
.mem_base
, soc_info
.mem_size
* SZ_1M
,
94 detect_memory_region(soc_info
.mem_base
,
95 soc_info
.mem_size_min
* SZ_1M
,
96 soc_info
.mem_size_max
* SZ_1M
);
99 static int __init
plat_of_setup(void)
101 static struct of_device_id of_ids
[3];
102 int len
= sizeof(of_ids
[0].compatible
);
104 if (!of_have_populated_dt())
105 panic("device tree not present");
107 strlcpy(of_ids
[0].compatible
, soc_info
.compatible
, len
);
108 strncpy(of_ids
[1].compatible
, "palmbus", len
);
110 if (of_platform_populate(NULL
, of_ids
, NULL
, NULL
))
111 panic("failed to populate DT\n");
113 /* make sure ithat the reset controller is setup early */
119 arch_initcall(plat_of_setup
);