Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) #include <linux/sizes.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <asm/addrspace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * This is the offset of the uncached section from its cached alias.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * Legacy platforms handle trivial transitions between cached and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * uncached segments by making use of the 1:1 mapping relationship in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * 512MB lowmem, others via a special uncached mapping.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * Default value only valid in 29 bit mode, in 32bit mode this will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * updated by the early PMB initialization code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) unsigned long cached_to_uncached = SZ_512M;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) unsigned long uncached_size = SZ_512M;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) unsigned long uncached_start, uncached_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) EXPORT_SYMBOL(uncached_start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) EXPORT_SYMBOL(uncached_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) int virt_addr_uncached(unsigned long kaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	return (kaddr >= uncached_start) && (kaddr < uncached_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) EXPORT_SYMBOL(virt_addr_uncached);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) void __init uncached_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #if defined(CONFIG_29BIT) || !defined(CONFIG_MMU)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 	uncached_start = P2SEG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	uncached_start = memory_end;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	uncached_end = uncached_start + uncached_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) void __init uncached_resize(unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	uncached_size = size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	uncached_end = uncached_start + uncached_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }