^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <asm/bootinfo.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <loongson.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <mem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <pci.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) u32 memsize, highmemsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) void __init prom_init_memory(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) memblock_add(0x0, (memsize << 20));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) int bit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) bit = fls(memsize + highmemsize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) if (bit != ffs(memsize + highmemsize))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) bit += 20;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) bit = bit + 20 - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /* set cpu window3 to map CPU to DDR: 2G -> 2G */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 0x80000000ul, (1 << bit));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) mmiowb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #ifdef CONFIG_64BIT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (highmemsize > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) memblock_add(LOONGSON_HIGHMEM_START, highmemsize << 20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #endif /* !CONFIG_64BIT */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /* override of arch/mips/mm/cache.c: __uncached_access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int __uncached_access(struct file *file, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) if (file->f_flags & O_DSYNC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return addr >= __pa(high_memory) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) ((addr >= LOONGSON_MMIO_MEM_START) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) (addr < LOONGSON_MMIO_MEM_END));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) }