1 /*
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.
5 *
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>
9 */
10
11 #include <linux/io.h>
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>
20
21 #include <asm/reboot.h>
22 #include <asm/bootinfo.h>
23 #include <asm/addrspace.h>
24
25 #include "common.h"
26
27 __iomem void *rt_sysc_membase;
28 __iomem void *rt_memc_membase;
29
30 extern struct boot_param_header __dtb_start;
31
plat_of_remap_node(const char * node)32 __iomem void *plat_of_remap_node(const char *node)
33 {
34 struct resource res;
35 struct device_node *np;
36
37 np = of_find_compatible_node(NULL, NULL, node);
38 if (!np)
39 panic("Failed to find %s node", node);
40
41 if (of_address_to_resource(np, 0, &res))
42 panic("Failed to get resource for %s", node);
43
44 if ((request_mem_region(res.start,
45 resource_size(&res),
46 res.name) < 0))
47 panic("Failed to request resources for %s", node);
48
49 return ioremap_nocache(res.start, resource_size(&res));
50 }
51
device_tree_init(void)52 void __init device_tree_init(void)
53 {
54 unsigned long base, size;
55 void *fdt_copy;
56
57 if (!initial_boot_params)
58 return;
59
60 base = virt_to_phys((void *)initial_boot_params);
61 size = be32_to_cpu(initial_boot_params->totalsize);
62
63 /* Before we do anything, lets reserve the dt blob */
64 reserve_bootmem(base, size, BOOTMEM_DEFAULT);
65
66 /* The strings in the flattened tree are referenced directly by the
67 * device tree, so copy the flattened device tree from init memory
68 * to regular memory.
69 */
70 fdt_copy = alloc_bootmem(size);
71 memcpy(fdt_copy, initial_boot_params, size);
72 initial_boot_params = fdt_copy;
73
74 unflatten_device_tree();
75
76 /* free the space reserved for the dt blob */
77 free_bootmem(base, size);
78 }
79
plat_mem_setup(void)80 void __init plat_mem_setup(void)
81 {
82 set_io_port_base(KSEG1);
83
84 /*
85 * Load the builtin devicetree. This causes the chosen node to be
86 * parsed resulting in our memory appearing
87 */
88 __dt_setup_arch(&__dtb_start);
89
90 if (soc_info.mem_size)
91 add_memory_region(soc_info.mem_base, soc_info.mem_size * SZ_1M,
92 BOOT_MEM_RAM);
93 else
94 detect_memory_region(soc_info.mem_base,
95 soc_info.mem_size_min * SZ_1M,
96 soc_info.mem_size_max * SZ_1M);
97 }
98
plat_of_setup(void)99 static int __init plat_of_setup(void)
100 {
101 static struct of_device_id of_ids[3];
102 int len = sizeof(of_ids[0].compatible);
103
104 if (!of_have_populated_dt())
105 panic("device tree not present");
106
107 strncpy(of_ids[0].compatible, soc_info.compatible, len);
108 strncpy(of_ids[1].compatible, "palmbus", len);
109
110 if (of_platform_populate(NULL, of_ids, NULL, NULL))
111 panic("failed to populate DT\n");
112
113 return 0;
114 }
115
116 arch_initcall(plat_of_setup);
117