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
prom_init_memory(void)17 void __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 */
__uncached_access(struct file * file,unsigned long addr)53 int __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
69 static unsigned long uca_start, uca_end;
70
phys_mem_access_prot(struct file * file,unsigned long pfn,unsigned long size,pgprot_t vma_prot)71 pgprot_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
find_vga_mem_init(void)89 static 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
118 late_initcall(find_vga_mem_init);
119 #endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */
120