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 as published by the
4 * Free Software Foundation;  either version 2 of the  License, or (at your
5 * option) any later version.
6 */
7#include <linux/fs.h>
8#include <linux/fcntl.h>
9#include <linux/mm.h>
10
11#include <asm/bootinfo.h>
12
13#include <loongson.h>
14#include <mem.h>
15#include <pci.h>
16
17void __init prom_init_memory(void)
18{
19	add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
20
21	add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
22				20), BOOT_MEM_RESERVED);
23
24#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
25	{
26		int bit;
27
28		bit = fls(memsize + highmemsize);
29		if (bit != ffs(memsize + highmemsize))
30			bit += 20;
31		else
32			bit = bit + 20 - 1;
33
34		/* set cpu window3 to map CPU to DDR: 2G -> 2G */
35		LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
36					  0x80000000ul, (1 << bit));
37		mmiowb();
38	}
39#endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
40
41#ifdef CONFIG_64BIT
42	if (highmemsize > 0)
43		add_memory_region(LOONGSON_HIGHMEM_START,
44				  highmemsize << 20, BOOT_MEM_RAM);
45
46	add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START -
47			  LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED);
48
49#endif /* !CONFIG_64BIT */
50}
51
52/* override of arch/mips/mm/cache.c: __uncached_access */
53int __uncached_access(struct file *file, unsigned long addr)
54{
55	if (file->f_flags & O_DSYNC)
56		return 1;
57
58	return addr >= __pa(high_memory) ||
59		((addr >= LOONGSON_MMIO_MEM_START) &&
60		 (addr < LOONGSON_MMIO_MEM_END));
61}
62
63#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
64
65#include <linux/pci.h>
66#include <linux/sched.h>
67#include <asm/current.h>
68
69static unsigned long uca_start, uca_end;
70
71pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
72			      unsigned long size, pgprot_t vma_prot)
73{
74	unsigned long offset = pfn << PAGE_SHIFT;
75	unsigned long end = offset + size;
76
77	if (__uncached_access(file, offset)) {
78		if (uca_start && (offset >= uca_start) &&
79		    (end <= uca_end))
80			return __pgprot((pgprot_val(vma_prot) &
81					 ~_CACHE_MASK) |
82					_CACHE_UNCACHED_ACCELERATED);
83		else
84			return pgprot_noncached(vma_prot);
85	}
86	return vma_prot;
87}
88
89static int __init find_vga_mem_init(void)
90{
91	struct pci_dev *dev = 0;
92	struct resource *r;
93	int idx;
94
95	if (uca_start)
96		return 0;
97
98	for_each_pci_dev(dev) {
99		if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
100			for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
101				r = &dev->resource[idx];
102				if (!r->start && r->end)
103					continue;
104				if (r->flags & IORESOURCE_IO)
105					continue;
106				if (r->flags & IORESOURCE_MEM) {
107					uca_start = r->start;
108					uca_end = r->end;
109					return 0;
110				}
111			}
112		}
113	}
114
115	return 0;
116}
117
118late_initcall(find_vga_mem_init);
119#endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */
120