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/*
* (C) Copyright 2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
/* for now: just dummy functions to satisfy the linker */
#include <common.h>
#include <malloc.h>
__weak void flush_cache(unsigned long start, unsigned long size)
{
#if defined(CONFIG_CPU_ARM1136)
#if !defined(CONFIG_SYS_ICACHE_OFF)
asm("mcr p15, 0, r1, c7, c5, 0"); /* invalidate I cache */
#endif
#if !defined(CONFIG_SYS_DCACHE_OFF)
asm("mcr p15, 0, r1, c7, c14, 0"); /* Clean+invalidate D cache */
#endif
#endif /* CONFIG_CPU_ARM1136 */
#ifdef CONFIG_CPU_ARM926EJS
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
/* test and clean, page 2-23 of arm926ejs manual */
asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory");
/* disable write buffer as well (page 2-22) */
asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
#endif
#endif /* CONFIG_CPU_ARM926EJS */
return;
}
/*
* Default implementation:
* do a range flush for the entire range
*/
__weak void flush_dcache_all(void)
{
flush_cache(0, ~0);
}
/*
* Default implementation of enable_caches()
* Real implementation should be in platform code
*/
__weak void enable_caches(void)
{
puts("WARNING: Caches not enabled\n");
}
#ifdef CONFIG_SYS_NONCACHED_MEMORY
/*
* Reserve one MMU section worth of address space below the malloc() area that
* will be mapped uncached.
*/
static unsigned long noncached_start;
static unsigned long noncached_end;
static unsigned long noncached_next;
void noncached_init(void)
{
phys_addr_t start, end;
size_t size;
end = ALIGN(mem_malloc_start, MMU_SECTION_SIZE) - MMU_SECTION_SIZE;
size = ALIGN(CONFIG_SYS_NONCACHED_MEMORY, MMU_SECTION_SIZE);
start = end - size;
debug("mapping memory %pa-%pa non-cached\n", &start, &end);
noncached_start = start;
noncached_end = end;
noncached_next = start;
#ifndef CONFIG_SYS_DCACHE_OFF
mmu_set_region_dcache_behaviour(noncached_start, size, DCACHE_OFF);
#endif
}
phys_addr_t noncached_alloc(size_t size, size_t align)
{
phys_addr_t next = ALIGN(noncached_next, align);
if (next >= noncached_end || (noncached_end - next) < size)
return 0;
debug("allocated %zu bytes of uncached memory @%pa\n", size, &next);
noncached_next = next + size;
return next;
}
#endif /* CONFIG_SYS_NONCACHED_MEMORY */
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