3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
8 /* for now: just dummy functions to satisfy the linker */
13 __weak void flush_cache(unsigned long start, unsigned long size)
15 #if defined(CONFIG_CPU_ARM1136)
17 #if !defined(CONFIG_SYS_ICACHE_OFF)
18 asm("mcr p15, 0, r1, c7, c5, 0"); /* invalidate I cache */
21 #if !defined(CONFIG_SYS_DCACHE_OFF)
22 asm("mcr p15, 0, r1, c7, c14, 0"); /* Clean+invalidate D cache */
25 #endif /* CONFIG_CPU_ARM1136 */
27 #ifdef CONFIG_CPU_ARM926EJS
28 #if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
30 /* test and clean, page 2-23 of arm926ejs manual */
31 "0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n"
32 /* flush write buffer as well (page 2-22) */
33 "mcr p15, 0, %0, c7, c10, 4" : : "r"(0) : "memory"
36 #endif /* CONFIG_CPU_ARM926EJS */
41 * Default implementation:
42 * do a range flush for the entire range
44 __weak void flush_dcache_all(void)
50 * Default implementation of enable_caches()
51 * Real implementation should be in platform code
53 __weak void enable_caches(void)
55 puts("WARNING: Caches not enabled\n");
58 #ifdef CONFIG_SYS_NONCACHED_MEMORY
60 * Reserve one MMU section worth of address space below the malloc() area that
61 * will be mapped uncached.
63 static unsigned long noncached_start;
64 static unsigned long noncached_end;
65 static unsigned long noncached_next;
67 void noncached_init(void)
69 phys_addr_t start, end;
72 end = ALIGN(mem_malloc_start, MMU_SECTION_SIZE) - MMU_SECTION_SIZE;
73 size = ALIGN(CONFIG_SYS_NONCACHED_MEMORY, MMU_SECTION_SIZE);
76 debug("mapping memory %pa-%pa non-cached\n", &start, &end);
78 noncached_start = start;
80 noncached_next = start;
82 #ifndef CONFIG_SYS_DCACHE_OFF
83 mmu_set_region_dcache_behaviour(noncached_start, size, DCACHE_OFF);
87 phys_addr_t noncached_alloc(size_t size, size_t align)
89 phys_addr_t next = ALIGN(noncached_next, align);
91 if (next >= noncached_end || (noncached_end - next) < size)
94 debug("allocated %zu bytes of uncached memory @%pa\n", size, &next);
95 noncached_next = next + size;
99 #endif /* CONFIG_SYS_NONCACHED_MEMORY */