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 <boot_param.h>
15 #include <mem.h>
16 #include <pci.h>
17
18 #ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
19
20 u32 memsize, highmemsize;
21
prom_init_memory(void)22 void __init prom_init_memory(void)
23 {
24 add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
25
26 add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
27 20), BOOT_MEM_RESERVED);
28
29 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
30 {
31 int bit;
32
33 bit = fls(memsize + highmemsize);
34 if (bit != ffs(memsize + highmemsize))
35 bit += 20;
36 else
37 bit = bit + 20 - 1;
38
39 /* set cpu window3 to map CPU to DDR: 2G -> 2G */
40 LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
41 0x80000000ul, (1 << bit));
42 mmiowb();
43 }
44 #endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
45
46 #ifdef CONFIG_64BIT
47 if (highmemsize > 0)
48 add_memory_region(LOONGSON_HIGHMEM_START,
49 highmemsize << 20, BOOT_MEM_RAM);
50
51 add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START -
52 LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED);
53
54 #endif /* !CONFIG_64BIT */
55 }
56
57 #else /* CONFIG_LEFI_FIRMWARE_INTERFACE */
58
prom_init_memory(void)59 void __init prom_init_memory(void)
60 {
61 int i;
62 u32 node_id;
63 u32 mem_type;
64
65 /* parse memory information */
66 for (i = 0; i < loongson_memmap->nr_map; i++) {
67 node_id = loongson_memmap->map[i].node_id;
68 mem_type = loongson_memmap->map[i].mem_type;
69
70 if (node_id == 0) {
71 switch (mem_type) {
72 case SYSTEM_RAM_LOW:
73 add_memory_region(loongson_memmap->map[i].mem_start,
74 (u64)loongson_memmap->map[i].mem_size << 20,
75 BOOT_MEM_RAM);
76 break;
77 case SYSTEM_RAM_HIGH:
78 add_memory_region(loongson_memmap->map[i].mem_start,
79 (u64)loongson_memmap->map[i].mem_size << 20,
80 BOOT_MEM_RAM);
81 break;
82 case MEM_RESERVED:
83 add_memory_region(loongson_memmap->map[i].mem_start,
84 (u64)loongson_memmap->map[i].mem_size << 20,
85 BOOT_MEM_RESERVED);
86 break;
87 }
88 }
89 }
90 }
91
92 #endif /* CONFIG_LEFI_FIRMWARE_INTERFACE */
93
94 /* override of arch/mips/mm/cache.c: __uncached_access */
__uncached_access(struct file * file,unsigned long addr)95 int __uncached_access(struct file *file, unsigned long addr)
96 {
97 if (file->f_flags & O_DSYNC)
98 return 1;
99
100 return addr >= __pa(high_memory) ||
101 ((addr >= LOONGSON_MMIO_MEM_START) &&
102 (addr < LOONGSON_MMIO_MEM_END));
103 }
104
105 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
106
107 #include <linux/pci.h>
108 #include <linux/sched.h>
109 #include <asm/current.h>
110
111 static unsigned long uca_start, uca_end;
112
phys_mem_access_prot(struct file * file,unsigned long pfn,unsigned long size,pgprot_t vma_prot)113 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
114 unsigned long size, pgprot_t vma_prot)
115 {
116 unsigned long offset = pfn << PAGE_SHIFT;
117 unsigned long end = offset + size;
118
119 if (__uncached_access(file, offset)) {
120 if (uca_start && (offset >= uca_start) &&
121 (end <= uca_end))
122 return __pgprot((pgprot_val(vma_prot) &
123 ~_CACHE_MASK) |
124 _CACHE_UNCACHED_ACCELERATED);
125 else
126 return pgprot_noncached(vma_prot);
127 }
128 return vma_prot;
129 }
130
find_vga_mem_init(void)131 static int __init find_vga_mem_init(void)
132 {
133 struct pci_dev *dev = 0;
134 struct resource *r;
135 int idx;
136
137 if (uca_start)
138 return 0;
139
140 for_each_pci_dev(dev) {
141 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
142 for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
143 r = &dev->resource[idx];
144 if (!r->start && r->end)
145 continue;
146 if (r->flags & IORESOURCE_IO)
147 continue;
148 if (r->flags & IORESOURCE_MEM) {
149 uca_start = r->start;
150 uca_end = r->end;
151 return 0;
152 }
153 }
154 }
155 }
156
157 return 0;
158 }
159
160 late_initcall(find_vga_mem_init);
161 #endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */
162