armv7: cache maintenance operations for armv7
- Add a framework for layered cache maintenance - separate out SOC specific outer cache maintenance from maintenance of caches known to CPU - Add generic ARMv7 cache maintenance operations that affect all caches known to ARMv7 CPUs. For instance in Cortex-A8 these opertions will affect both L1 and L2 caches. In Cortex-A9 these will affect only L1 cache - D-cache operations supported: - Invalidate entire D-cache - Invalidate D-cache range - Flush(clean & invalidate) entire D-cache - Flush D-cache range - I-cache operations supported: - Invalidate entire I-cache - Add maintenance functions for TLB, branch predictor array etc. - Enable -march=armv7-a so that armv7 assembly instructions can be used Signed-off-by: Aneesh V <aneesh@ti.com>utp
parent
4c93da7c39
commit
2c451f7831
5
README
5
README
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@ -460,6 +460,11 @@ The following options need to be configured:
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Note: If a "bootargs" environment is defined, it will overwride
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Note: If a "bootargs" environment is defined, it will overwride
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the defaults discussed just above.
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the defaults discussed just above.
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- Cache Configuration:
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CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
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CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
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CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
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- Serial Ports:
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- Serial Ports:
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CONFIG_PL010_SERIAL
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CONFIG_PL010_SERIAL
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@ -26,7 +26,7 @@ include $(TOPDIR)/config.mk
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LIB = $(obj)lib$(CPU).o
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LIB = $(obj)lib$(CPU).o
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START := start.o
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START := start.o
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COBJS := cpu.o
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COBJS := cpu.o cache_v7.o
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COBJS += syslib.o
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COBJS += syslib.o
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SRCS := $(START:.o=.S) $(COBJS:.o=.c)
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SRCS := $(START:.o=.S) $(COBJS:.o=.c)
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@ -0,0 +1,394 @@
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/*
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* (C) Copyright 2010
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* Texas Instruments, <www.ti.com>
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* Aneesh V <aneesh@ti.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <linux/types.h>
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#include <common.h>
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#include <asm/armv7.h>
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#include <asm/utils.h>
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#define ARMV7_DCACHE_INVAL_ALL 1
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#define ARMV7_DCACHE_CLEAN_INVAL_ALL 2
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#define ARMV7_DCACHE_INVAL_RANGE 3
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#define ARMV7_DCACHE_CLEAN_INVAL_RANGE 4
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#ifndef CONFIG_SYS_DCACHE_OFF
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/*
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* Write the level and type you want to Cache Size Selection Register(CSSELR)
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* to get size details from Current Cache Size ID Register(CCSIDR)
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*/
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static void set_csselr(u32 level, u32 type)
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{ u32 csselr = level << 1 | type;
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/* Write to Cache Size Selection Register(CSSELR) */
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asm volatile ("mcr p15, 2, %0, c0, c0, 0" : : "r" (csselr));
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}
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static u32 get_ccsidr(void)
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{
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u32 ccsidr;
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/* Read current CP15 Cache Size ID Register */
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asm volatile ("mrc p15, 1, %0, c0, c0, 0" : "=r" (ccsidr));
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return ccsidr;
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}
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static u32 get_clidr(void)
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{
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u32 clidr;
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/* Read current CP15 Cache Level ID Register */
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asm volatile ("mrc p15,1,%0,c0,c0,1" : "=r" (clidr));
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return clidr;
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}
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static void v7_inval_dcache_level_setway(u32 level, u32 num_sets,
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u32 num_ways, u32 way_shift,
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u32 log2_line_len)
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{
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int way, set, setway;
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/*
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* For optimal assembly code:
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* a. count down
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* b. have bigger loop inside
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*/
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for (way = num_ways - 1; way >= 0 ; way--) {
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for (set = num_sets - 1; set >= 0; set--) {
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setway = (level << 1) | (set << log2_line_len) |
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(way << way_shift);
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/* Invalidate data/unified cache line by set/way */
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asm volatile (" mcr p15, 0, %0, c7, c6, 2"
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: : "r" (setway));
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}
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}
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/* DMB to make sure the operation is complete */
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CP15DMB;
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}
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static void v7_clean_inval_dcache_level_setway(u32 level, u32 num_sets,
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u32 num_ways, u32 way_shift,
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u32 log2_line_len)
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{
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int way, set, setway;
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/*
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* For optimal assembly code:
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* a. count down
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* b. have bigger loop inside
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*/
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for (way = num_ways - 1; way >= 0 ; way--) {
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for (set = num_sets - 1; set >= 0; set--) {
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setway = (level << 1) | (set << log2_line_len) |
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(way << way_shift);
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/*
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* Clean & Invalidate data/unified
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* cache line by set/way
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*/
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asm volatile (" mcr p15, 0, %0, c7, c14, 2"
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: : "r" (setway));
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}
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}
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/* DMB to make sure the operation is complete */
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CP15DMB;
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}
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static void v7_maint_dcache_level_setway(u32 level, u32 operation)
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{
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u32 ccsidr;
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u32 num_sets, num_ways, log2_line_len, log2_num_ways;
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u32 way_shift;
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set_csselr(level, ARMV7_CSSELR_IND_DATA_UNIFIED);
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ccsidr = get_ccsidr();
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log2_line_len = ((ccsidr & CCSIDR_LINE_SIZE_MASK) >>
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CCSIDR_LINE_SIZE_OFFSET) + 2;
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/* Converting from words to bytes */
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log2_line_len += 2;
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num_ways = ((ccsidr & CCSIDR_ASSOCIATIVITY_MASK) >>
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CCSIDR_ASSOCIATIVITY_OFFSET) + 1;
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num_sets = ((ccsidr & CCSIDR_NUM_SETS_MASK) >>
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CCSIDR_NUM_SETS_OFFSET) + 1;
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/*
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* According to ARMv7 ARM number of sets and number of ways need
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* not be a power of 2
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*/
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log2_num_ways = log_2_n_round_up(num_ways);
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way_shift = (32 - log2_num_ways);
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if (operation == ARMV7_DCACHE_INVAL_ALL) {
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v7_inval_dcache_level_setway(level, num_sets, num_ways,
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way_shift, log2_line_len);
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} else if (operation == ARMV7_DCACHE_CLEAN_INVAL_ALL) {
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v7_clean_inval_dcache_level_setway(level, num_sets, num_ways,
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way_shift, log2_line_len);
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}
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}
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static void v7_maint_dcache_all(u32 operation)
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{
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u32 level, cache_type, level_start_bit = 0;
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u32 clidr = get_clidr();
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for (level = 0; level < 7; level++) {
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cache_type = (clidr >> level_start_bit) & 0x7;
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if ((cache_type == ARMV7_CLIDR_CTYPE_DATA_ONLY) ||
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(cache_type == ARMV7_CLIDR_CTYPE_INSTRUCTION_DATA) ||
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(cache_type == ARMV7_CLIDR_CTYPE_UNIFIED))
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v7_maint_dcache_level_setway(level, operation);
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level_start_bit += 3;
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}
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}
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static void v7_dcache_clean_inval_range(u32 start,
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u32 stop, u32 line_len)
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{
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u32 mva;
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/* Align start to cache line boundary */
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start &= ~(line_len - 1);
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for (mva = start; mva < stop; mva = mva + line_len) {
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/* DCCIMVAC - Clean & Invalidate data cache by MVA to PoC */
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asm volatile ("mcr p15, 0, %0, c7, c14, 1" : : "r" (mva));
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}
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}
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static void v7_dcache_inval_range(u32 start, u32 stop, u32 line_len)
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{
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u32 mva;
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/*
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* If start address is not aligned to cache-line flush the first
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* line to prevent affecting somebody else's buffer
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*/
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if (start & (line_len - 1)) {
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v7_dcache_clean_inval_range(start, start + 1, line_len);
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/* move to next cache line */
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start = (start + line_len - 1) & ~(line_len - 1);
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}
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/*
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* If stop address is not aligned to cache-line flush the last
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* line to prevent affecting somebody else's buffer
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*/
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if (stop & (line_len - 1)) {
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v7_dcache_clean_inval_range(stop, stop + 1, line_len);
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/* align to the beginning of this cache line */
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stop &= ~(line_len - 1);
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}
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for (mva = start; mva < stop; mva = mva + line_len) {
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/* DCIMVAC - Invalidate data cache by MVA to PoC */
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asm volatile ("mcr p15, 0, %0, c7, c6, 1" : : "r" (mva));
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}
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}
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static void v7_dcache_maint_range(u32 start, u32 stop, u32 range_op)
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{
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u32 line_len, ccsidr;
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ccsidr = get_ccsidr();
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line_len = ((ccsidr & CCSIDR_LINE_SIZE_MASK) >>
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CCSIDR_LINE_SIZE_OFFSET) + 2;
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/* Converting from words to bytes */
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line_len += 2;
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/* converting from log2(linelen) to linelen */
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line_len = 1 << line_len;
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switch (range_op) {
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case ARMV7_DCACHE_CLEAN_INVAL_RANGE:
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v7_dcache_clean_inval_range(start, stop, line_len);
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break;
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case ARMV7_DCACHE_INVAL_RANGE:
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v7_dcache_inval_range(start, stop, line_len);
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break;
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}
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/* DMB to make sure the operation is complete */
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CP15DMB;
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}
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/* Invalidate TLB */
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static void v7_inval_tlb(void)
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{
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/* Invalidate entire unified TLB */
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asm volatile ("mcr p15, 0, %0, c8, c7, 0" : : "r" (0));
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/* Invalidate entire data TLB */
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asm volatile ("mcr p15, 0, %0, c8, c6, 0" : : "r" (0));
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/* Invalidate entire instruction TLB */
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asm volatile ("mcr p15, 0, %0, c8, c5, 0" : : "r" (0));
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/* Full system DSB - make sure that the invalidation is complete */
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CP15DSB;
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/* Full system ISB - make sure the instruction stream sees it */
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CP15ISB;
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}
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void invalidate_dcache_all(void)
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{
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v7_maint_dcache_all(ARMV7_DCACHE_INVAL_ALL);
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v7_outer_cache_inval_all();
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}
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/*
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* Performs a clean & invalidation of the entire data cache
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* at all levels
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*/
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void flush_dcache_all(void)
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{
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v7_maint_dcache_all(ARMV7_DCACHE_CLEAN_INVAL_ALL);
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v7_outer_cache_flush_all();
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}
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/*
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* Invalidates range in all levels of D-cache/unified cache used:
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* Affects the range [start, stop - 1]
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*/
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void invalidate_dcache_range(unsigned long start, unsigned long stop)
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{
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v7_dcache_maint_range(start, stop, ARMV7_DCACHE_INVAL_RANGE);
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v7_outer_cache_inval_range(start, stop);
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}
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/*
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* Flush range(clean & invalidate) from all levels of D-cache/unified
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* cache used:
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* Affects the range [start, stop - 1]
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*/
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void flush_dcache_range(unsigned long start, unsigned long stop)
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{
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v7_dcache_maint_range(start, stop, ARMV7_DCACHE_CLEAN_INVAL_RANGE);
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v7_outer_cache_flush_range(start, stop);
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}
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void arm_init_before_mmu(void)
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{
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v7_outer_cache_enable();
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invalidate_dcache_all();
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v7_inval_tlb();
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}
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/*
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* Flush range from all levels of d-cache/unified-cache used:
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* Affects the range [start, start + size - 1]
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*/
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void flush_cache(unsigned long start, unsigned long size)
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{
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flush_dcache_range(start, start + size);
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}
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#else /* #ifndef CONFIG_SYS_DCACHE_OFF */
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void invalidate_dcache_all(void)
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{
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}
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void flush_dcache_all(void)
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{
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}
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void invalidate_dcache_range(unsigned long start, unsigned long stop)
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{
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}
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void flush_dcache_range(unsigned long start, unsigned long stop)
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{
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}
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void arm_init_before_mmu(void)
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{
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}
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void flush_cache(unsigned long start, unsigned long size)
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{
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}
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#endif /* #ifndef CONFIG_SYS_DCACHE_OFF */
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#ifndef CONFIG_SYS_ICACHE_OFF
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/* Invalidate entire I-cache and branch predictor array */
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void invalidate_icache_all(void)
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{
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/*
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* Invalidate all instruction caches to PoU.
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* Also flushes branch target cache.
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*/
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asm volatile ("mcr p15, 0, %0, c7, c5, 0" : : "r" (0));
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/* Invalidate entire branch predictor array */
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asm volatile ("mcr p15, 0, %0, c7, c5, 6" : : "r" (0));
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/* Full system DSB - make sure that the invalidation is complete */
|
||||||
|
CP15DSB;
|
||||||
|
|
||||||
|
/* ISB - make sure the instruction stream sees it */
|
||||||
|
CP15ISB;
|
||||||
|
}
|
||||||
|
#else
|
||||||
|
void invalidate_icache_all(void)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
#endif
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Stub implementations for outer cache operations
|
||||||
|
*/
|
||||||
|
void __v7_outer_cache_enable(void)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
void v7_outer_cache_enable(void)
|
||||||
|
__attribute__((weak, alias("__v7_outer_cache_enable")));
|
||||||
|
|
||||||
|
void __v7_outer_cache_disable(void)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
void v7_outer_cache_disable(void)
|
||||||
|
__attribute__((weak, alias("__v7_outer_cache_disable")));
|
||||||
|
|
||||||
|
void __v7_outer_cache_flush_all(void)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
void v7_outer_cache_flush_all(void)
|
||||||
|
__attribute__((weak, alias("__v7_outer_cache_flush_all")));
|
||||||
|
|
||||||
|
void __v7_outer_cache_inval_all(void)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
void v7_outer_cache_inval_all(void)
|
||||||
|
__attribute__((weak, alias("__v7_outer_cache_inval_all")));
|
||||||
|
|
||||||
|
void __v7_outer_cache_flush_range(u32 start, u32 end)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
void v7_outer_cache_flush_range(u32 start, u32 end)
|
||||||
|
__attribute__((weak, alias("__v7_outer_cache_flush_range")));
|
||||||
|
|
||||||
|
void __v7_outer_cache_inval_range(u32 start, u32 end)
|
||||||
|
{
|
||||||
|
}
|
||||||
|
void v7_outer_cache_inval_range(u32 start, u32 end)
|
||||||
|
__attribute__((weak, alias("__v7_outer_cache_inval_range")));
|
|
@ -0,0 +1,67 @@
|
||||||
|
/*
|
||||||
|
* (C) Copyright 2010
|
||||||
|
* Texas Instruments, <www.ti.com>
|
||||||
|
* Aneesh V <aneesh@ti.com>
|
||||||
|
*
|
||||||
|
* See file CREDITS for list of people who contributed to this
|
||||||
|
* project.
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or
|
||||||
|
* modify it under the terms of the GNU General Public License as
|
||||||
|
* published by the Free Software Foundation; either version 2 of
|
||||||
|
* the License, or (at your option) any later version.
|
||||||
|
*
|
||||||
|
* 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, write to the Free Software
|
||||||
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||||||
|
* MA 02111-1307 USA
|
||||||
|
*/
|
||||||
|
#ifndef ARMV7_H
|
||||||
|
#define ARMV7_H
|
||||||
|
#include <linux/types.h>
|
||||||
|
|
||||||
|
/* CCSIDR */
|
||||||
|
#define CCSIDR_LINE_SIZE_OFFSET 0
|
||||||
|
#define CCSIDR_LINE_SIZE_MASK 0x7
|
||||||
|
#define CCSIDR_ASSOCIATIVITY_OFFSET 3
|
||||||
|
#define CCSIDR_ASSOCIATIVITY_MASK (0x3FF << 3)
|
||||||
|
#define CCSIDR_NUM_SETS_OFFSET 13
|
||||||
|
#define CCSIDR_NUM_SETS_MASK (0x7FFF << 13)
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Values for InD field in CSSELR
|
||||||
|
* Selects the type of cache
|
||||||
|
*/
|
||||||
|
#define ARMV7_CSSELR_IND_DATA_UNIFIED 0
|
||||||
|
#define ARMV7_CSSELR_IND_INSTRUCTION 1
|
||||||
|
|
||||||
|
/* Values for Ctype fields in CLIDR */
|
||||||
|
#define ARMV7_CLIDR_CTYPE_NO_CACHE 0
|
||||||
|
#define ARMV7_CLIDR_CTYPE_INSTRUCTION_ONLY 1
|
||||||
|
#define ARMV7_CLIDR_CTYPE_DATA_ONLY 2
|
||||||
|
#define ARMV7_CLIDR_CTYPE_INSTRUCTION_DATA 3
|
||||||
|
#define ARMV7_CLIDR_CTYPE_UNIFIED 4
|
||||||
|
|
||||||
|
/*
|
||||||
|
* CP15 Barrier instructions
|
||||||
|
* Please note that we have separate barrier instructions in ARMv7
|
||||||
|
* However, we use the CP15 based instructtions because we use
|
||||||
|
* -march=armv5 in U-Boot
|
||||||
|
*/
|
||||||
|
#define CP15ISB asm volatile ("mcr p15, 0, %0, c7, c5, 4" : : "r" (0))
|
||||||
|
#define CP15DSB asm volatile ("mcr p15, 0, %0, c7, c10, 4" : : "r" (0))
|
||||||
|
#define CP15DMB asm volatile ("mcr p15, 0, %0, c7, c10, 5" : : "r" (0))
|
||||||
|
|
||||||
|
void v7_outer_cache_enable(void);
|
||||||
|
void v7_outer_cache_disable(void);
|
||||||
|
void v7_outer_cache_flush_all(void);
|
||||||
|
void v7_outer_cache_inval_all(void);
|
||||||
|
void v7_outer_cache_flush_range(u32 start, u32 end);
|
||||||
|
void v7_outer_cache_inval_range(u32 start, u32 end);
|
||||||
|
|
||||||
|
#endif
|
|
@ -0,0 +1,56 @@
|
||||||
|
/*
|
||||||
|
* (C) Copyright 2010
|
||||||
|
* Texas Instruments, <www.ti.com>
|
||||||
|
* Aneesh V <aneesh@ti.com>
|
||||||
|
*
|
||||||
|
* See file CREDITS for list of people who contributed to this
|
||||||
|
* project.
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or
|
||||||
|
* modify it under the terms of the GNU General Public License as
|
||||||
|
* published by the Free Software Foundation; either version 2 of
|
||||||
|
* the License, or (at your option) any later version.
|
||||||
|
*
|
||||||
|
* 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, write to the Free Software
|
||||||
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
||||||
|
* MA 02111-1307 USA
|
||||||
|
*/
|
||||||
|
#ifndef _UTILS_H_
|
||||||
|
#define _UTILS_H_
|
||||||
|
|
||||||
|
static inline s32 log_2_n_round_up(u32 n)
|
||||||
|
{
|
||||||
|
s32 log2n = -1;
|
||||||
|
u32 temp = n;
|
||||||
|
|
||||||
|
while (temp) {
|
||||||
|
log2n++;
|
||||||
|
temp >>= 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (n & (n - 1))
|
||||||
|
return log2n + 1; /* not power of 2 - round up */
|
||||||
|
else
|
||||||
|
return log2n; /* power of 2 */
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline s32 log_2_n_round_down(u32 n)
|
||||||
|
{
|
||||||
|
s32 log2n = -1;
|
||||||
|
u32 temp = n;
|
||||||
|
|
||||||
|
while (temp) {
|
||||||
|
log2n++;
|
||||||
|
temp >>= 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
return log2n;
|
||||||
|
}
|
||||||
|
|
||||||
|
#endif
|
|
@ -413,6 +413,7 @@ void icache_disable(void);
|
||||||
int dcache_status (void);
|
int dcache_status (void);
|
||||||
void dcache_enable (void);
|
void dcache_enable (void);
|
||||||
void dcache_disable(void);
|
void dcache_disable(void);
|
||||||
|
void mmu_disable(void);
|
||||||
void relocate_code (ulong, gd_t *, ulong) __attribute__ ((noreturn));
|
void relocate_code (ulong, gd_t *, ulong) __attribute__ ((noreturn));
|
||||||
ulong get_endaddr (void);
|
ulong get_endaddr (void);
|
||||||
void trap_init (ulong);
|
void trap_init (ulong);
|
||||||
|
@ -611,9 +612,11 @@ ulong video_setmem (ulong);
|
||||||
|
|
||||||
/* arch/$(ARCH)/lib/cache.c */
|
/* arch/$(ARCH)/lib/cache.c */
|
||||||
void flush_cache (unsigned long, unsigned long);
|
void flush_cache (unsigned long, unsigned long);
|
||||||
|
void flush_dcache_all(void);
|
||||||
void flush_dcache_range(unsigned long start, unsigned long stop);
|
void flush_dcache_range(unsigned long start, unsigned long stop);
|
||||||
void invalidate_dcache_range(unsigned long start, unsigned long stop);
|
void invalidate_dcache_range(unsigned long start, unsigned long stop);
|
||||||
|
void invalidate_dcache_all(void);
|
||||||
|
void invalidate_icache_all(void);
|
||||||
|
|
||||||
/* arch/$(ARCH)/lib/ticks.S */
|
/* arch/$(ARCH)/lib/ticks.S */
|
||||||
unsigned long long get_ticks(void);
|
unsigned long long get_ticks(void);
|
||||||
|
|
Loading…
Reference in New Issue