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 20u32 memsize, highmemsize; 21 22void __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 59void __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 */ 95int __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 111static unsigned long uca_start, uca_end; 112 113pgprot_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 131static 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 160late_initcall(find_vga_mem_init); 161#endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */ 162