loongson2ef/common/mem.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  */
0004 #include <linux/fs.h>
0005 #include <linux/fcntl.h>
0006 #include <linux/memblock.h>
0007 #include <linux/mm.h>
0008
0009 #include <asm/bootinfo.h>
0010
0011 #include <loongson.h>
0012 #include <mem.h>
0013 #include <pci.h>
0014
0015
0016 u32 memsize, highmemsize;
0017
0018 void __init prom_init_memory(void)
0019 {
0020     memblock_add(0x0, (memsize << 20));
0021
0022 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
0023     {
0024         int bit;
0025
0026         bit = fls(memsize + highmemsize);
0027         if (bit != ffs(memsize + highmemsize))
0028             bit += 20;
0029         else
0030             bit = bit + 20 - 1;
0031
0032         /* set cpu window3 to map CPU to DDR: 2G -> 2G */
0033         LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
0034                       0x80000000ul, (1 << bit));
0035         mmiowb();
0036     }
0037 #endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
0038
0039 #ifdef CONFIG_64BIT
0040     if (highmemsize > 0)
0041         memblock_add(LOONGSON_HIGHMEM_START, highmemsize << 20);
0042 #endif /* !CONFIG_64BIT */
0043 }