1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun */ 4*4882a593Smuzhiyun #include <linux/fs.h> 5*4882a593Smuzhiyun #include <linux/fcntl.h> 6*4882a593Smuzhiyun #include <linux/memblock.h> 7*4882a593Smuzhiyun #include <linux/mm.h> 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <asm/bootinfo.h> 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun #include <loongson.h> 12*4882a593Smuzhiyun #include <mem.h> 13*4882a593Smuzhiyun #include <pci.h> 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun u32 memsize, highmemsize; 17*4882a593Smuzhiyun prom_init_memory(void)18*4882a593Smuzhiyunvoid __init prom_init_memory(void) 19*4882a593Smuzhiyun { 20*4882a593Smuzhiyun memblock_add(0x0, (memsize << 20)); 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG 23*4882a593Smuzhiyun { 24*4882a593Smuzhiyun int bit; 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun bit = fls(memsize + highmemsize); 27*4882a593Smuzhiyun if (bit != ffs(memsize + highmemsize)) 28*4882a593Smuzhiyun bit += 20; 29*4882a593Smuzhiyun else 30*4882a593Smuzhiyun bit = bit + 20 - 1; 31*4882a593Smuzhiyun 32*4882a593Smuzhiyun /* set cpu window3 to map CPU to DDR: 2G -> 2G */ 33*4882a593Smuzhiyun LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul, 34*4882a593Smuzhiyun 0x80000000ul, (1 << bit)); 35*4882a593Smuzhiyun mmiowb(); 36*4882a593Smuzhiyun } 37*4882a593Smuzhiyun #endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */ 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun #ifdef CONFIG_64BIT 40*4882a593Smuzhiyun if (highmemsize > 0) 41*4882a593Smuzhiyun memblock_add(LOONGSON_HIGHMEM_START, highmemsize << 20); 42*4882a593Smuzhiyun #endif /* !CONFIG_64BIT */ 43*4882a593Smuzhiyun } 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun /* override of arch/mips/mm/cache.c: __uncached_access */ __uncached_access(struct file * file,unsigned long addr)46*4882a593Smuzhiyunint __uncached_access(struct file *file, unsigned long addr) 47*4882a593Smuzhiyun { 48*4882a593Smuzhiyun if (file->f_flags & O_DSYNC) 49*4882a593Smuzhiyun return 1; 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun return addr >= __pa(high_memory) || 52*4882a593Smuzhiyun ((addr >= LOONGSON_MMIO_MEM_START) && 53*4882a593Smuzhiyun (addr < LOONGSON_MMIO_MEM_END)); 54*4882a593Smuzhiyun } 55