u-boot/arch/arm/cpu/armv7/cache_v7.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2010
 * Texas Instruments, <www.ti.com>
 * Aneesh V <aneesh@ti.com>
 */
#include <linux/types.h>
#include <common.h>
#include <asm/armv7.h>
#include <asm/utils.h>

#define ARMV7_DCACHE_INVAL_RANGE	1
#define ARMV7_DCACHE_CLEAN_INVAL_RANGE	2

#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)

/* Asm functions from cache_v7_asm.S */
void v7_flush_dcache_all(void);
void v7_invalidate_dcache_all(void);

static u32 get_ccsidr(void)
{
	u32 ccsidr;

	/* Read current CP15 Cache Size ID Register */
	asm volatile ("mrc p15, 1, %0, c0, c0, 0" : "=r" (ccsidr));
	return ccsidr;
}

static void v7_dcache_clean_inval_range(u32 start, u32 stop, u32 line_len)
{
	u32 mva;

	/* Align start to cache line boundary */
	start &= ~(line_len - 1);
	for (mva = start; mva < stop; mva = mva + line_len) {
		/* DCCIMVAC - Clean & Invalidate data cache by MVA to PoC */
		asm volatile ("mcr p15, 0, %0, c7, c14, 1" : : "r" (mva));
	}
}

static void v7_dcache_inval_range(u32 start, u32 stop, u32 line_len)
{
	u32 mva;

	if (!check_cache_range(start, stop))
		return;

	for (mva = start; mva < stop; mva = mva + line_len) {
		/* DCIMVAC - Invalidate data cache by MVA to PoC */
		asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (mva));
	}
}

static void v7_dcache_maint_range(u32 start, u32 stop, u32 range_op)
{
	u32 line_len, ccsidr;

	ccsidr = get_ccsidr();
	line_len = ((ccsidr & CCSIDR_LINE_SIZE_MASK) >>
			CCSIDR_LINE_SIZE_OFFSET) + 2;
	/* Converting from words to bytes */
	line_len += 2;
	/* converting from log2(linelen) to linelen */
	line_len = 1 << line_len;

	switch (range_op) {
	case ARMV7_DCACHE_CLEAN_INVAL_RANGE:
		v7_dcache_clean_inval_range(start, stop, line_len);
		break;
	case ARMV7_DCACHE_INVAL_RANGE:
		v7_dcache_inval_range(start, stop, line_len);
		break;
	}

	/* DSB to make sure the operation is complete */
	dsb();
}

/* Invalidate TLB */
static void v7_inval_tlb(void)
{
	/* Invalidate entire unified TLB */
	asm volatile ("mcr p15, 0, %0, c8, c7, 0" : : "r" (0));
	/* Invalidate entire data TLB */
	asm volatile ("mcr p15, 0, %0, c8, c6, 0" : : "r" (0));
	/* Invalidate entire instruction TLB */
	asm volatile ("mcr p15, 0, %0, c8, c5, 0" : : "r" (0));
	/* Full system DSB - make sure that the invalidation is complete */
	dsb();
	/* Full system ISB - make sure the instruction stream sees it */
	isb();
}

void invalidate_dcache_all(void)
{
	v7_invalidate_dcache_all();

	v7_outer_cache_inval_all();
}

/*
 * Performs a clean & invalidation of the entire data cache
 * at all levels
 */
void flush_dcache_all(void)
{
	v7_flush_dcache_all();

	v7_outer_cache_flush_all();
}

/*
 * Invalidates range in all levels of D-cache/unified cache used:
 * Affects the range [start, stop - 1]
 */
void invalidate_dcache_range(unsigned long start, unsigned long stop)
{
	check_cache_range(start, stop);

	v7_dcache_maint_range(start, stop, ARMV7_DCACHE_INVAL_RANGE);

	v7_outer_cache_inval_range(start, stop);
}

/*
 * Flush range(clean & invalidate) from all levels of D-cache/unified
 * cache used:
 * Affects the range [start, stop - 1]
 */
void flush_dcache_range(unsigned long start, unsigned long stop)
{
	check_cache_range(start, stop);

	v7_dcache_maint_range(start, stop, ARMV7_DCACHE_CLEAN_INVAL_RANGE);

	v7_outer_cache_flush_range(start, stop);
}

void arm_init_before_mmu(void)
{
	v7_outer_cache_enable();
	invalidate_dcache_all();
	v7_inval_tlb();
}

void mmu_page_table_flush(unsigned long start, unsigned long stop)
{
	flush_dcache_range(start, stop);
	v7_inval_tlb();
}
#else /* #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) */
void invalidate_dcache_all(void)
{
}

void flush_dcache_all(void)
{
}

void invalidate_dcache_range(unsigned long start, unsigned long stop)
{
}

void flush_dcache_range(unsigned long start, unsigned long stop)
{
}

void arm_init_before_mmu(void)
{
}

void mmu_page_table_flush(unsigned long start, unsigned long stop)
{
}

void arm_init_domains(void)
{
}
#endif /* #if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) */

#if !CONFIG_IS_ENABLED(SYS_ICACHE_OFF)
/* Invalidate entire I-cache and branch predictor array */
void invalidate_icache_all(void)
{
	/*
	 * Invalidate all instruction caches to PoU.
	 * Also flushes branch target cache.
	 */
	asm volatile ("mcr p15, 0, %0, c7, c5, 0" : : "r" (0));

	/* Invalidate entire branch predictor array */
	asm volatile ("mcr p15, 0, %0, c7, c5, 6" : : "r" (0));

	/* Full system DSB - make sure that the invalidation is complete */
	dsb();

	/* ISB - make sure the instruction stream sees it */
	isb();
}
#else
void invalidate_icache_all(void)
{
}
#endif

/*  Stub implementations for outer cache operations */
__weak void v7_outer_cache_enable(void) {}
__weak void v7_outer_cache_disable(void) {}
__weak void v7_outer_cache_flush_all(void) {}
__weak void v7_outer_cache_inval_all(void) {}
__weak void v7_outer_cache_flush_range(u32 start, u32 end) {}
__weak void v7_outer_cache_inval_range(u32 start, u32 end) {}