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Linux/arch/mips/loongson64/common/mem.c

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  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 
 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 
 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 */
 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 
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 
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 

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