arch/mips/loongson/common/mem.c

   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 */