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 /* test and clean, page 2-23 of arm926ejs manual */
29 asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory");
30 /* disable write buffer as well (page 2-22) */
31 asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
32 #endif /* CONFIG_CPU_ARM926EJS */
37 * Default implementation:
38 * do a range flush for the entire range
40 __weak void flush_dcache_all(void)
46 * Default implementation of enable_caches()
47 * Real implementation should be in platform code
49 __weak void enable_caches(void)
51 puts("WARNING: Caches not enabled\n");
54 #ifdef CONFIG_SYS_NONCACHED_MEMORY
56 * Reserve one MMU section worth of address space below the malloc() area that
57 * will be mapped uncached.
59 static unsigned long noncached_start;
60 static unsigned long noncached_end;
61 static unsigned long noncached_next;
63 void noncached_init(void)
65 phys_addr_t start, end;
68 end = ALIGN(mem_malloc_start, MMU_SECTION_SIZE) - MMU_SECTION_SIZE;
69 size = ALIGN(CONFIG_SYS_NONCACHED_MEMORY, MMU_SECTION_SIZE);
72 debug("mapping memory %pa-%pa non-cached\n", &start, &end);
74 noncached_start = start;
76 noncached_next = start;
78 #ifndef CONFIG_SYS_DCACHE_OFF
79 mmu_set_region_dcache_behaviour(noncached_start, size, DCACHE_OFF);
83 phys_addr_t noncached_alloc(size_t size, size_t align)
85 phys_addr_t next = ALIGN(noncached_next, align);
87 if (next >= noncached_end || (noncached_end - next) < size)
90 debug("allocated %zu bytes of uncached memory @%pa\n", size, &next);
91 noncached_next = next + size;
95 #endif /* CONFIG_SYS_NONCACHED_MEMORY */