summaryrefslogtreecommitdiff
path: root/arch/mips/loongson64/common/mem.c
blob: c549e525fc11f80124753a296a46fac025fc1894 (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
/*
 * This program is free software; you can redistribute	it and/or modify it
 * under  the terms of	the GNU General	 Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/mm.h>

#include <asm/bootinfo.h>

#include <loongson.h>
#include <boot_param.h>
#include <mem.h>
#include <pci.h>

#ifndef CONFIG_LEFI_FIRMWARE_INTERFACE

u32 memsize, highmemsize;

void __init prom_init_memory(void)
{
	add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);

	add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
				20), BOOT_MEM_RESERVED);

#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
	{
		int bit;

		bit = fls(memsize + highmemsize);
		if (bit != ffs(memsize + highmemsize))
			bit += 20;
		else
			bit = bit + 20 - 1;

		/* set cpu window3 to map CPU to DDR: 2G -> 2G */
		LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
					  0x80000000ul, (1 << bit));
		mmiowb();
	}
#endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */

#ifdef CONFIG_64BIT
	if (highmemsize > 0)
		add_memory_region(LOONGSON_HIGHMEM_START,
				  highmemsize << 20, BOOT_MEM_RAM);

	add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START -
			  LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED);

#endif /* !CONFIG_64BIT */
}

#else /* CONFIG_LEFI_FIRMWARE_INTERFACE */

void __init prom_init_memory(void)
{
	int i;
	u32 node_id;
	u32 mem_type;

	/* parse memory information */
	for (i = 0; i < loongson_memmap->nr_map; i++) {
		node_id = loongson_memmap->map[i].node_id;
		mem_type = loongson_memmap->map[i].mem_type;

		if (node_id == 0) {
			switch (mem_type) {
			case SYSTEM_RAM_LOW:
				add_memory_region(loongson_memmap->map[i].mem_start,
					(u64)loongson_memmap->map[i].mem_size << 20,
					BOOT_MEM_RAM);
				break;
			case SYSTEM_RAM_HIGH:
				add_memory_region(loongson_memmap->map[i].mem_start,
					(u64)loongson_memmap->map[i].mem_size << 20,
					BOOT_MEM_RAM);
				break;
			case SYSTEM_RAM_RESERVED:
				add_memory_region(loongson_memmap->map[i].mem_start,
					(u64)loongson_memmap->map[i].mem_size << 20,
					BOOT_MEM_RESERVED);
				break;
			}
		}
	}
}

#endif /* CONFIG_LEFI_FIRMWARE_INTERFACE */

/* override of arch/mips/mm/cache.c: __uncached_access */
int __uncached_access(struct file *file, unsigned long addr)
{
	if (file->f_flags & O_DSYNC)
		return 1;

	return addr >= __pa(high_memory) ||
		((addr >= LOONGSON_MMIO_MEM_START) &&
		 (addr < LOONGSON_MMIO_MEM_END));
}

#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED

#include <linux/pci.h>
#include <linux/sched.h>
#include <asm/current.h>

static unsigned long uca_start, uca_end;

pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
			      unsigned long size, pgprot_t vma_prot)
{
	unsigned long offset = pfn << PAGE_SHIFT;
	unsigned long end = offset + size;

	if (__uncached_access(file, offset)) {
		if (uca_start && (offset >= uca_start) &&
		    (end <= uca_end))
			return __pgprot((pgprot_val(vma_prot) &
					 ~_CACHE_MASK) |
					_CACHE_UNCACHED_ACCELERATED);
		else
			return pgprot_noncached(vma_prot);
	}
	return vma_prot;
}

static int __init find_vga_mem_init(void)
{
	struct pci_dev *dev = 0;
	struct resource *r;
	int idx;

	if (uca_start)
		return 0;

	for_each_pci_dev(dev) {
		if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
			for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
				r = &dev->resource[idx];
				if (!r->start && r->end)
					continue;
				if (r->flags & IORESOURCE_IO)
					continue;
				if (r->flags & IORESOURCE_MEM) {
					uca_start = r->start;
					uca_end = r->end;
					return 0;
				}
			}
		}
	}

	return 0;
}

late_initcall(find_vga_mem_init);
#endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */