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https://github.com/edk2-porting/linux-next.git
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983f4c514c
This reverts commit 64a6d72213.
Unfortunately we can't use on_each_cpu() for all of the cache ops, as
some of them only require preempt disabling. This seems to be the same
issue that impacts the mips r4k caches, where this code was based on.
This fixes up a deadlock that showed up in some IRQ context cases.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
141 lines
3.5 KiB
C
141 lines
3.5 KiB
C
/*
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* arch/sh/mm/cache-sh2a.c
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*
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* Copyright (C) 2008 Yoshinori Sato
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*
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* Released under the terms of the GNU GPL v2.0.
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <asm/cache.h>
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#include <asm/addrspace.h>
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#include <asm/processor.h>
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#include <asm/cacheflush.h>
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#include <asm/io.h>
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static void sh2a__flush_wback_region(void *start, int size)
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{
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unsigned long v;
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unsigned long begin, end;
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unsigned long flags;
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begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
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end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
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& ~(L1_CACHE_BYTES-1);
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local_irq_save(flags);
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jump_to_uncached();
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for (v = begin; v < end; v+=L1_CACHE_BYTES) {
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unsigned long addr = CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0);
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int way;
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for (way = 0; way < 4; way++) {
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unsigned long data = ctrl_inl(addr | (way << 11));
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if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
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data &= ~SH_CACHE_UPDATED;
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ctrl_outl(data, addr | (way << 11));
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}
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}
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}
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back_to_cached();
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local_irq_restore(flags);
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}
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static void sh2a__flush_purge_region(void *start, int size)
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{
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unsigned long v;
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unsigned long begin, end;
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unsigned long flags;
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begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
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end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
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& ~(L1_CACHE_BYTES-1);
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local_irq_save(flags);
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jump_to_uncached();
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for (v = begin; v < end; v+=L1_CACHE_BYTES) {
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ctrl_outl((v & CACHE_PHYSADDR_MASK),
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CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);
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}
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back_to_cached();
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local_irq_restore(flags);
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}
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static void sh2a__flush_invalidate_region(void *start, int size)
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{
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unsigned long v;
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unsigned long begin, end;
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unsigned long flags;
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begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
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end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
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& ~(L1_CACHE_BYTES-1);
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local_irq_save(flags);
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jump_to_uncached();
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#ifdef CONFIG_CACHE_WRITEBACK
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ctrl_outl(ctrl_inl(CCR) | CCR_OCACHE_INVALIDATE, CCR);
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/* I-cache invalidate */
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for (v = begin; v < end; v+=L1_CACHE_BYTES) {
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ctrl_outl((v & CACHE_PHYSADDR_MASK),
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CACHE_IC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);
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}
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#else
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for (v = begin; v < end; v+=L1_CACHE_BYTES) {
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ctrl_outl((v & CACHE_PHYSADDR_MASK),
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CACHE_IC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);
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ctrl_outl((v & CACHE_PHYSADDR_MASK),
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CACHE_OC_ADDRESS_ARRAY | (v & 0x000007f0) | 0x00000008);
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}
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#endif
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back_to_cached();
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local_irq_restore(flags);
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}
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/* WBack O-Cache and flush I-Cache */
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static void sh2a_flush_icache_range(void *args)
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{
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struct flusher_data *data = args;
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unsigned long start, end;
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unsigned long v;
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unsigned long flags;
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start = data->addr1 & ~(L1_CACHE_BYTES-1);
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end = (data->addr2 + L1_CACHE_BYTES-1) & ~(L1_CACHE_BYTES-1);
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local_irq_save(flags);
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jump_to_uncached();
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for (v = start; v < end; v+=L1_CACHE_BYTES) {
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unsigned long addr = (v & 0x000007f0);
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int way;
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/* O-Cache writeback */
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for (way = 0; way < 4; way++) {
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unsigned long data = ctrl_inl(CACHE_OC_ADDRESS_ARRAY | addr | (way << 11));
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if ((data & CACHE_PHYSADDR_MASK) == (v & CACHE_PHYSADDR_MASK)) {
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data &= ~SH_CACHE_UPDATED;
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ctrl_outl(data, CACHE_OC_ADDRESS_ARRAY | addr | (way << 11));
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}
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}
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/* I-Cache invalidate */
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ctrl_outl(addr,
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CACHE_IC_ADDRESS_ARRAY | addr | 0x00000008);
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}
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back_to_cached();
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local_irq_restore(flags);
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}
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void __init sh2a_cache_init(void)
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{
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local_flush_icache_range = sh2a_flush_icache_range;
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__flush_wback_region = sh2a__flush_wback_region;
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__flush_purge_region = sh2a__flush_purge_region;
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__flush_invalidate_region = sh2a__flush_invalidate_region;
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}
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