summaryrefslogtreecommitdiffstats
path: root/arch/csky/kernel/setup.c
blob: dff8b89444ec5571a6eeb82d36ac2f7f0329b8d7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.

#include <linux/console.h>
#include <linux/memblock.h>
#include <linux/initrd.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/start_kernel.h>
#include <linux/dma-contiguous.h>
#include <linux/screen_info.h>
#include <asm/sections.h>
#include <asm/mmu_context.h>
#include <asm/pgalloc.h>

#ifdef CONFIG_DUMMY_CONSOLE
struct screen_info screen_info = {
	.orig_video_lines	= 30,
	.orig_video_cols	= 80,
	.orig_video_mode	= 0,
	.orig_video_ega_bx	= 0,
	.orig_video_isVGA	= 1,
	.orig_video_points	= 8
};
#endif

phys_addr_t __init_memblock memblock_end_of_REG0(void)
{
	return (memblock.memory.regions[0].base +
		memblock.memory.regions[0].size);
}

phys_addr_t __init_memblock memblock_start_of_REG1(void)
{
	return memblock.memory.regions[1].base;
}

size_t __init_memblock memblock_size_of_REG1(void)
{
	return memblock.memory.regions[1].size;
}

static void __init csky_memblock_init(void)
{
	unsigned long zone_size[MAX_NR_ZONES];
	unsigned long zhole_size[MAX_NR_ZONES];
	signed long size;

	memblock_reserve(__pa(_stext), _end - _stext);
#ifdef CONFIG_BLK_DEV_INITRD
	memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
#endif

	early_init_fdt_reserve_self();
	early_init_fdt_scan_reserved_mem();

	memblock_dump_all();

	memset(zone_size, 0, sizeof(zone_size));
	memset(zhole_size, 0, sizeof(zhole_size));

	min_low_pfn = PFN_UP(memblock_start_of_DRAM());
	max_pfn	    = PFN_DOWN(memblock_end_of_DRAM());

	max_low_pfn = PFN_UP(memblock_end_of_REG0());
	if (max_low_pfn == 0)
		max_low_pfn = max_pfn;

	size = max_pfn - min_low_pfn;

	if (memblock.memory.cnt > 1) {
		zone_size[ZONE_NORMAL]  =
			PFN_DOWN(memblock_start_of_REG1()) - min_low_pfn;
		zhole_size[ZONE_NORMAL] =
			PFN_DOWN(memblock_start_of_REG1()) - max_low_pfn;
	} else {
		if (size <= PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET))
			zone_size[ZONE_NORMAL] = max_pfn - min_low_pfn;
		else {
			zone_size[ZONE_NORMAL] =
				PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
			max_low_pfn = min_low_pfn + zone_size[ZONE_NORMAL];
		}
	}

#ifdef CONFIG_HIGHMEM
	size = 0;
	if (memblock.memory.cnt > 1) {
		size = PFN_DOWN(memblock_size_of_REG1());
		highstart_pfn = PFN_DOWN(memblock_start_of_REG1());
	} else {
		size = max_pfn - min_low_pfn -
			PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
		highstart_pfn =  min_low_pfn +
			PFN_DOWN(LOWMEM_LIMIT - PHYS_OFFSET_OFFSET);
	}

	if (size > 0)
		zone_size[ZONE_HIGHMEM] = size;

	highend_pfn = max_pfn;
#endif
	memblock_set_current_limit(PFN_PHYS(max_low_pfn));

	dma_contiguous_reserve(0);

	free_area_init_node(0, zone_size, min_low_pfn, zhole_size);
}

void __init setup_arch(char **cmdline_p)
{
	*cmdline_p = boot_command_line;

	console_verbose();

	pr_info("Phys. mem: %ldMB\n",
		(unsigned long) memblock_phys_mem_size()/1024/1024);

	init_mm.start_code = (unsigned long) _stext;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = (unsigned long) _end;

	parse_early_param();

	csky_memblock_init();

	unflatten_and_copy_device_tree();

#ifdef CONFIG_SMP
	setup_smp();
#endif

	sparse_init();

#ifdef CONFIG_HIGHMEM
	kmap_init();
#endif

#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
}

asmlinkage __visible void __init csky_start(unsigned int unused, void *param)
{
	/* Clean up bss section */
	memset(__bss_start, 0, __bss_stop - __bss_start);

	pre_trap_init();
	pre_mmu_init();

	if (param == NULL)
		early_init_dt_scan(__dtb_start);
	else
		early_init_dt_scan(param);

	start_kernel();

	asm volatile("br .\n");
}