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/*
* This file is part of the coreboot project.
*
* Copyright 2013 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* cache.c: Cache maintenance routines for ARMv7-A and ARMv7-R
*
* Reference: ARM Architecture Reference Manual, ARMv7-A and ARMv7-R edition
*/
#include <stdint.h>
#include <arch/cache.h>
#include <arch/virtual.h>
void tlb_invalidate_all(void)
{
/* TLBIALL includes dTLB and iTLB on systems that have them. */
tlbiall();
dsb();
isb();
}
enum dcache_op {
OP_DCCSW,
OP_DCCISW,
OP_DCISW,
OP_DCCIMVAC,
OP_DCCMVAC,
OP_DCIMVAC,
};
unsigned int dcache_line_bytes(void)
{
uint32_t ccsidr;
static unsigned int line_bytes = 0;
if (line_bytes)
return line_bytes;
ccsidr = read_ccsidr();
/* [2:0] - Indicates (Log2(number of words in cache line)) - 2 */
line_bytes = 1 << ((ccsidr & 0x7) + 2); /* words per line */
line_bytes *= sizeof(unsigned int); /* bytes per line */
return line_bytes;
}
/*
* Do a dcache operation by modified virtual address. This is useful for
* maintaining coherency in drivers which do DMA transfers and only need to
* perform cache maintenance on a particular memory range rather than the
* entire cache.
*/
static void dcache_op_mva(void const *vaddr, size_t len, enum dcache_op op)
{
unsigned long line, linesize;
unsigned long paddr = virt_to_phys(vaddr);
linesize = dcache_line_bytes();
line = paddr & ~(linesize - 1);
dsb();
while (line < paddr + len) {
switch(op) {
case OP_DCCIMVAC:
dccimvac(line);
break;
case OP_DCCMVAC:
dccmvac(line);
break;
case OP_DCIMVAC:
dcimvac(line);
break;
default:
break;
}
line += linesize;
}
isb();
}
void dcache_clean_by_mva(void const *addr, size_t len)
{
dcache_op_mva(addr, len, OP_DCCMVAC);
}
void dcache_clean_invalidate_by_mva(void const *addr, size_t len)
{
dcache_op_mva(addr, len, OP_DCCIMVAC);
}
void dcache_invalidate_by_mva(void const *addr, size_t len)
{
dcache_op_mva(addr, len, OP_DCIMVAC);
}
/*
* CAUTION: This implementation assumes that coreboot never uses non-identity
* page tables for pages containing executed code. If you ever want to violate
* this assumption, have fun figuring out the associated problems on your own.
*/
void dcache_mmu_disable(void)
{
uint32_t sctlr;
dcache_clean_invalidate_all();
sctlr = read_sctlr();
sctlr &= ~(SCTLR_C | SCTLR_M);
write_sctlr(sctlr);
}
void dcache_mmu_enable(void)
{
uint32_t sctlr;
sctlr = read_sctlr();
sctlr |= SCTLR_C | SCTLR_M;
write_sctlr(sctlr);
}
void cache_sync_instructions(void)
{
uint32_t sctlr;
sctlr = read_sctlr();
if (sctlr & SCTLR_C)
dcache_clean_all();
else if (sctlr & SCTLR_I)
dcache_clean_invalidate_all();
iciallu(); /* includes BPIALLU (architecturally) */
dsb();
isb();
}
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