[PATCH v2 2/5] ARM: cache: remove ARMv3 support code
Hyok S. Choi
hyok.choi at samsung.com
Mon Mar 25 22:21:47 EDT 2013
The ARM7 designs mostly implement the ARMv4T architecture, but some
implement ARMv3 or ARMv5TEJ. (e.g. ARM710) If these architectures are totaly
obsoleted in the tree, there will be no problem.
Acked-by: Hyok S. Choi <hyok.choi at samsung.com>
Best,
Hyok
-----Original Message-----
From: Greg Ungerer [mailto:gerg at uclinux.org]
Sent: Tuesday, March 26, 2013 10:57 AM
To: Will Deacon
Cc: linux-arm-kernel at lists.infradead.org; Hyok S. Choi
Subject: Re: [PATCH v2 2/5] ARM: cache: remove ARMv3 support code
Hi Will,
On 26/03/13 04:17, Will Deacon wrote:
> This is only used by 740t, which is a v4 core and (by my reading of
> the datasheet for the CPU) ignores CRm for the cp15 cache flush
> operation, making the v4 cache implementation in cache-v4.S sufficient
> for this CPU.
>
> Tested with 740T core-tile on Integrator/AP baseboard.
>
> Cc: Hyok S. Choi <hyok.choi at samsung.com>
> Cc: Greg Ungerer <gerg at uclinux.org>
I have no problem with this:
Acked-by: Greg Ungerer <gerg at uclinux.org>
Regards
Greg
> Signed-off-by: Will Deacon <will.deacon at arm.com>
> ---
> arch/arm/include/asm/glue-cache.h | 8 ---
> arch/arm/mm/Kconfig | 5 +-
> arch/arm/mm/Makefile | 1 -
> arch/arm/mm/cache-v3.S | 137
--------------------------------------
> arch/arm/mm/proc-arm740.S | 2 +-
> 5 files changed, 2 insertions(+), 151 deletions(-) delete mode
> 100644 arch/arm/mm/cache-v3.S
>
> diff --git a/arch/arm/include/asm/glue-cache.h
> b/arch/arm/include/asm/glue-cache.h
> index cca9f15..ea289e1 100644
> --- a/arch/arm/include/asm/glue-cache.h
> +++ b/arch/arm/include/asm/glue-cache.h
> @@ -19,14 +19,6 @@
> #undef _CACHE
> #undef MULTI_CACHE
>
> -#if defined(CONFIG_CPU_CACHE_V3)
> -# ifdef _CACHE
> -# define MULTI_CACHE 1
> -# else
> -# define _CACHE v3
> -# endif
> -#endif
> -
> #if defined(CONFIG_CPU_CACHE_V4)
> # ifdef _CACHE
> # define MULTI_CACHE 1
> diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig index
> 025d173..4045c49 100644
> --- a/arch/arm/mm/Kconfig
> +++ b/arch/arm/mm/Kconfig
> @@ -43,7 +43,7 @@ config CPU_ARM740T
> depends on !MMU
> select CPU_32v4T
> select CPU_ABRT_LV4T
> - select CPU_CACHE_V3 # although the core is v4t
> + select CPU_CACHE_V4
> select CPU_CP15_MPU
> select CPU_PABRT_LEGACY
> help
> @@ -469,9 +469,6 @@ config CPU_PABRT_V7
> bool
>
> # The cache model
> -config CPU_CACHE_V3
> - bool
> -
> config CPU_CACHE_V4
> bool
>
> diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile index
> 4e333fa..9e51be9 100644
> --- a/arch/arm/mm/Makefile
> +++ b/arch/arm/mm/Makefile
> @@ -33,7 +33,6 @@ obj-$(CONFIG_CPU_PABRT_LEGACY) += pabort-legacy.o
> obj-$(CONFIG_CPU_PABRT_V6) += pabort-v6.o
> obj-$(CONFIG_CPU_PABRT_V7) += pabort-v7.o
>
> -obj-$(CONFIG_CPU_CACHE_V3) += cache-v3.o
> obj-$(CONFIG_CPU_CACHE_V4) += cache-v4.o
> obj-$(CONFIG_CPU_CACHE_V4WT) += cache-v4wt.o
> obj-$(CONFIG_CPU_CACHE_V4WB) += cache-v4wb.o
> diff --git a/arch/arm/mm/cache-v3.S b/arch/arm/mm/cache-v3.S deleted
> file mode 100644 index 8a3fade..0000000
> --- a/arch/arm/mm/cache-v3.S
> +++ /dev/null
> @@ -1,137 +0,0 @@
> -/*
> - * linux/arch/arm/mm/cache-v3.S
> - *
> - * Copyright (C) 1997-2002 Russell king
> - *
> - * 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.
> - */
> -#include <linux/linkage.h>
> -#include <linux/init.h>
> -#include <asm/page.h>
> -#include "proc-macros.S"
> -
> -/*
> - * flush_icache_all()
> - *
> - * Unconditionally clean and invalidate the entire icache.
> - */
> -ENTRY(v3_flush_icache_all)
> - mov pc, lr
> -ENDPROC(v3_flush_icache_all)
> -
> -/*
> - * flush_user_cache_all()
> - *
> - * Invalidate all cache entries in a particular address
> - * space.
> - *
> - * - mm - mm_struct describing address space
> - */
> -ENTRY(v3_flush_user_cache_all)
> - /* FALLTHROUGH */
> -/*
> - * flush_kern_cache_all()
> - *
> - * Clean and invalidate the entire cache.
> - */
> -ENTRY(v3_flush_kern_cache_all)
> - /* FALLTHROUGH */
> -
> -/*
> - * flush_user_cache_range(start, end, flags)
> - *
> - * Invalidate a range of cache entries in the specified
> - * address space.
> - *
> - * - start - start address (may not be aligned)
> - * - end - end address (exclusive, may not be aligned)
> - * - flags - vma_area_struct flags describing address space
> - */
> -ENTRY(v3_flush_user_cache_range)
> - mov ip, #0
> - mcreq p15, 0, ip, c7, c0, 0 @ flush ID cache
> - mov pc, lr
> -
> -/*
> - * coherent_kern_range(start, end)
> - *
> - * Ensure coherency between the Icache and the Dcache in the
> - * region described by start. If you have non-snooping
> - * Harvard caches, you need to implement this function.
> - *
> - * - start - virtual start address
> - * - end - virtual end address
> - */
> -ENTRY(v3_coherent_kern_range)
> - /* FALLTHROUGH */
> -
> -/*
> - * coherent_user_range(start, end)
> - *
> - * Ensure coherency between the Icache and the Dcache in the
> - * region described by start. If you have non-snooping
> - * Harvard caches, you need to implement this function.
> - *
> - * - start - virtual start address
> - * - end - virtual end address
> - */
> -ENTRY(v3_coherent_user_range)
> - mov r0, #0
> - mov pc, lr
> -
> -/*
> - * flush_kern_dcache_area(void *page, size_t size)
> - *
> - * Ensure no D cache aliasing occurs, either with itself or
> - * the I cache
> - *
> - * - addr - kernel address
> - * - size - region size
> - */
> -ENTRY(v3_flush_kern_dcache_area)
> - /* FALLTHROUGH */
> -
> -/*
> - * dma_flush_range(start, end)
> - *
> - * Clean and invalidate the specified virtual address range.
> - *
> - * - start - virtual start address
> - * - end - virtual end address
> - */
> -ENTRY(v3_dma_flush_range)
> - mov r0, #0
> - mcr p15, 0, r0, c7, c0, 0 @ flush ID cache
> - mov pc, lr
> -
> -/*
> - * dma_unmap_area(start, size, dir)
> - * - start - kernel virtual start address
> - * - size - size of region
> - * - dir - DMA direction
> - */
> -ENTRY(v3_dma_unmap_area)
> - teq r2, #DMA_TO_DEVICE
> - bne v3_dma_flush_range
> - /* FALLTHROUGH */
> -
> -/*
> - * dma_map_area(start, size, dir)
> - * - start - kernel virtual start address
> - * - size - size of region
> - * - dir - DMA direction
> - */
> -ENTRY(v3_dma_map_area)
> - mov pc, lr
> -ENDPROC(v3_dma_unmap_area)
> -ENDPROC(v3_dma_map_area)
> -
> - .globl v3_flush_kern_cache_louis
> - .equ v3_flush_kern_cache_louis, v3_flush_kern_cache_all
> -
> - __INITDATA
> -
> - @ define struct cpu_cache_fns (see <asm/cacheflush.h> and
proc-macros.S)
> - define_cache_functions v3
> diff --git a/arch/arm/mm/proc-arm740.S b/arch/arm/mm/proc-arm740.S
> index dc5de5d..2088234 100644
> --- a/arch/arm/mm/proc-arm740.S
> +++ b/arch/arm/mm/proc-arm740.S
> @@ -145,5 +145,5 @@ __arm740_proc_info:
> .long arm740_processor_functions
> .long 0
> .long 0
> - .long v3_cache_fns @ cache model
> + .long v4_cache_fns @ cache model
> .size __arm740_proc_info, . - __arm740_proc_info
>
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