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/*
* Copyright (C) 2012 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_CACHE_H
#define __ASM_CACHE_H
#include <asm/cputype.h>
#define CTR_L1IP_SHIFT 14
#define CTR_L1IP_MASK 3
#define CTR_DMINLINE_SHIFT 16
#define CTR_IMINLINE_SHIFT 0
#define CTR_ERG_SHIFT 20
#define CTR_CWG_SHIFT 24
#define CTR_CWG_MASK 15
#define CTR_IDC_SHIFT 28
#define CTR_DIC_SHIFT 29
#define CTR_CACHE_MINLINE_MASK \
(0xf << CTR_DMINLINE_SHIFT | 0xf << CTR_IMINLINE_SHIFT)
#define CTR_L1IP(ctr) (((ctr) >> CTR_L1IP_SHIFT) & CTR_L1IP_MASK)
#define ICACHE_POLICY_VPIPT 0
#define ICACHE_POLICY_VIPT 2
#define ICACHE_POLICY_PIPT 3
#define L1_CACHE_SHIFT (6)
#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
#define CLIDR_LOUU_SHIFT 27
#define CLIDR_LOC_SHIFT 24
#define CLIDR_LOUIS_SHIFT 21
#define CLIDR_LOUU(clidr) (((clidr) >> CLIDR_LOUU_SHIFT) & 0x7)
#define CLIDR_LOC(clidr) (((clidr) >> CLIDR_LOC_SHIFT) & 0x7)
#define CLIDR_LOUIS(clidr) (((clidr) >> CLIDR_LOUIS_SHIFT) & 0x7)
/*
* Memory returned by kmalloc() may be used for DMA, so we must make
* sure that all such allocations are cache aligned. Otherwise,
* unrelated code may cause parts of the buffer to be read into the
* cache before the transfer is done, causing old data to be seen by
* the CPU.
*/
#define ARCH_DMA_MINALIGN (128)
#ifndef __ASSEMBLY__
#include <linux/bitops.h>
#define ICACHEF_ALIASING 0
#define ICACHEF_VPIPT 1
extern unsigned long __icache_flags;
/*
* Whilst the D-side always behaves as PIPT on AArch64, aliasing is
* permitted in the I-cache.
*/
static inline int icache_is_aliasing(void)
{
return test_bit(ICACHEF_ALIASING, &__icache_flags);
}
static inline int icache_is_vpipt(void)
{
return test_bit(ICACHEF_VPIPT, &__icache_flags);
}
static inline u32 cache_type_cwg(void)
{
return (read_cpuid_cachetype() >> CTR_CWG_SHIFT) & CTR_CWG_MASK;
}
#define __read_mostly __attribute__((__section__(".data..read_mostly")))
static inline int cache_line_size(void)
{
u32 cwg = cache_type_cwg();
return cwg ? 4 << cwg : ARCH_DMA_MINALIGN;
}
/*
* Read the effective value of CTR_EL0.
*
* According to ARM ARM for ARMv8-A (ARM DDI 0487C.a),
* section D10.2.33 "CTR_EL0, Cache Type Register" :
*
* CTR_EL0.IDC reports the data cache clean requirements for
* instruction to data coherence.
*
* 0 - dcache clean to PoU is required unless :
* (CLIDR_EL1.LoC == 0) || (CLIDR_EL1.LoUIS == 0 && CLIDR_EL1.LoUU == 0)
* 1 - dcache clean to PoU is not required for i-to-d coherence.
*
* This routine provides the CTR_EL0 with the IDC field updated to the
* effective state.
*/
static inline u32 __attribute_const__ read_cpuid_effective_cachetype(void)
{
u32 ctr = read_cpuid_cachetype();
if (!(ctr & BIT(CTR_IDC_SHIFT))) {
u64 clidr = read_sysreg(clidr_el1);
if (CLIDR_LOC(clidr) == 0 ||
(CLIDR_LOUIS(clidr) == 0 && CLIDR_LOUU(clidr) == 0))
ctr |= BIT(CTR_IDC_SHIFT);
}
return ctr;
}
#endif /* __ASSEMBLY__ */
#endif
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