arch/mips/loongson64/common/mem.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  */
   4 #include <linux/fs.h>
   5 #include <linux/fcntl.h>
   6 #include <linux/mm.h>
   7
   8 #include <asm/bootinfo.h>
   9
  10 #include <loongson.h>
  11 #include <boot_param.h>
  12 #include <mem.h>
  13 #include <pci.h>
  14
  15 #ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
  16
  17 u32 memsize, highmemsize;
  18
  19 void __init prom_init_memory(void)
  20 {
  21         add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
  22
  23         add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
  24                                 20), BOOT_MEM_RESERVED);
  25
  26 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
  27         {
  28                 int bit;
  29
  30                 bit = fls(memsize + highmemsize);
  31                 if (bit != ffs(memsize + highmemsize))
  32                         bit += 20;
  33                 else
  34                         bit = bit + 20 - 1;
  35
  36                 /* set cpu window3 to map CPU to DDR: 2G -> 2G */
  37                 LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
  38                                           0x80000000ul, (1 << bit));
  39                 mmiowb();
  40         }
  41 #endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
  42
  43 #ifdef CONFIG_64BIT
  44         if (highmemsize > 0)
  45                 add_memory_region(LOONGSON_HIGHMEM_START,
  46                                   highmemsize << 20, BOOT_MEM_RAM);
  47
  48         add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START -
  49                           LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED);
  50
  51 #endif /* !CONFIG_64BIT */
  52 }
  53
  54 #else /* CONFIG_LEFI_FIRMWARE_INTERFACE */
  55
  56 void __init prom_init_memory(void)
  57 {
  58         int i;
  59         u32 node_id;
  60         u32 mem_type;
  61
  62         /* parse memory information */
  63         for (i = 0; i < loongson_memmap->nr_map; i++) {
  64                 node_id = loongson_memmap->map[i].node_id;
  65                 mem_type = loongson_memmap->map[i].mem_type;
  66
  67                 if (node_id == 0) {
  68                         switch (mem_type) {
  69                         case SYSTEM_RAM_LOW:
  70                                 add_memory_region(loongson_memmap->map[i].mem_start,
  71                                         (u64)loongson_memmap->map[i].mem_size << 20,
  72                                         BOOT_MEM_RAM);
  73                                 break;
  74                         case SYSTEM_RAM_HIGH:
  75                                 add_memory_region(loongson_memmap->map[i].mem_start,
  76                                         (u64)loongson_memmap->map[i].mem_size << 20,
  77                                         BOOT_MEM_RAM);
  78                                 break;
  79                         case SYSTEM_RAM_RESERVED:
  80                                 add_memory_region(loongson_memmap->map[i].mem_start,
  81                                         (u64)loongson_memmap->map[i].mem_size << 20,
  82                                         BOOT_MEM_RESERVED);
  83                                 break;
  84                         }
  85                 }
  86         }
  87 }
  88
  89 #endif /* CONFIG_LEFI_FIRMWARE_INTERFACE */
  90
  91 /* override of arch/mips/mm/cache.c: __uncached_access */
  92 int __uncached_access(struct file *file, unsigned long addr)
  93 {
  94         if (file->f_flags & O_DSYNC)
  95                 return 1;
  96
  97         return addr >= __pa(high_memory) ||
  98                 ((addr >= LOONGSON_MMIO_MEM_START) &&
  99                  (addr < LOONGSON_MMIO_MEM_END));
 100 }
 101
 102 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
 103
 104 #include <linux/pci.h>
 105 #include <linux/sched.h>
 106 #include <asm/current.h>
 107
 108 static unsigned long uca_start, uca_end;
 109
 110 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
 111                               unsigned long size, pgprot_t vma_prot)
 112 {
 113         unsigned long offset = pfn << PAGE_SHIFT;
 114         unsigned long end = offset + size;
 115
 116         if (__uncached_access(file, offset)) {
 117                 if (uca_start && (offset >= uca_start) &&
 118                     (end <= uca_end))
 119                         return __pgprot((pgprot_val(vma_prot) &
 120                                          ~_CACHE_MASK) |
 121                                         _CACHE_UNCACHED_ACCELERATED);
 122                 else
 123                         return pgprot_noncached(vma_prot);
 124         }
 125         return vma_prot;
 126 }
 127
 128 static int __init find_vga_mem_init(void)
 129 {
 130         struct pci_dev *dev = 0;
 131         struct resource *r;
 132         int idx;
 133
 134         if (uca_start)
 135                 return 0;
 136
 137         for_each_pci_dev(dev) {
 138                 if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
 139                         for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
 140                                 r = &dev->resource[idx];
 141                                 if (!r->start && r->end)
 142                                         continue;
 143                                 if (r->flags & IORESOURCE_IO)
 144                                         continue;
 145                                 if (r->flags & IORESOURCE_MEM) {
 146                                         uca_start = r->start;
 147                                         uca_end = r->end;
 148                                         return 0;
 149                                 }
 150                         }
 151                 }
 152         }
 153
 154         return 0;
 155 }
 156
 157 late_initcall(find_vga_mem_init);
 158 #endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */