1 /* 2 * (C) Copyright 2002 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* for now: just dummy functions to satisfy the linker */ 9 10 #include <common.h> 11 #include <malloc.h> 12 13 /* 14 * Flush range from all levels of d-cache/unified-cache. 15 * Affects the range [start, start + size - 1]. 16 */ 17 __weak void flush_cache(unsigned long start, unsigned long size) 18 { 19 flush_dcache_range(start, start + size); 20 } 21 22 /* 23 * Default implementation: 24 * do a range flush for the entire range 25 */ 26 __weak void flush_dcache_all(void) 27 { 28 flush_cache(0, ~0); 29 } 30 31 /* 32 * Default implementation of enable_caches() 33 * Real implementation should be in platform code 34 */ 35 __weak void enable_caches(void) 36 { 37 puts("WARNING: Caches not enabled\n"); 38 } 39 40 __weak void invalidate_dcache_range(unsigned long start, unsigned long stop) 41 { 42 /* An empty stub, real implementation should be in platform code */ 43 } 44 __weak void flush_dcache_range(unsigned long start, unsigned long stop) 45 { 46 /* An empty stub, real implementation should be in platform code */ 47 } 48 49 #ifdef CONFIG_SYS_NONCACHED_MEMORY 50 /* 51 * Reserve one MMU section worth of address space below the malloc() area that 52 * will be mapped uncached. 53 */ 54 static unsigned long noncached_start; 55 static unsigned long noncached_end; 56 static unsigned long noncached_next; 57 58 void noncached_init(void) 59 { 60 phys_addr_t start, end; 61 size_t size; 62 63 end = ALIGN(mem_malloc_start, MMU_SECTION_SIZE) - MMU_SECTION_SIZE; 64 size = ALIGN(CONFIG_SYS_NONCACHED_MEMORY, MMU_SECTION_SIZE); 65 start = end - size; 66 67 debug("mapping memory %pa-%pa non-cached\n", &start, &end); 68 69 noncached_start = start; 70 noncached_end = end; 71 noncached_next = start; 72 73 #ifndef CONFIG_SYS_DCACHE_OFF 74 mmu_set_region_dcache_behaviour(noncached_start, size, DCACHE_OFF); 75 #endif 76 } 77 78 phys_addr_t noncached_alloc(size_t size, size_t align) 79 { 80 phys_addr_t next = ALIGN(noncached_next, align); 81 82 if (next >= noncached_end || (noncached_end - next) < size) 83 return 0; 84 85 debug("allocated %zu bytes of uncached memory @%pa\n", size, &next); 86 noncached_next = next + size; 87 88 return next; 89 } 90 #endif /* CONFIG_SYS_NONCACHED_MEMORY */ 91