LXR linux/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 <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