127 lines
2.6 KiB
C
127 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/spinlock.h>
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#include <asm/cache.h>
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#include <abi/reg_ops.h>
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/* for L1-cache */
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#define INS_CACHE (1 << 0)
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#define DATA_CACHE (1 << 1)
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#define CACHE_INV (1 << 4)
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#define CACHE_CLR (1 << 5)
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#define CACHE_OMS (1 << 6)
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#define CACHE_ITS (1 << 7)
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#define CACHE_LICF (1 << 31)
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/* for L2-cache */
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#define CR22_LEVEL_SHIFT (1)
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#define CR22_SET_SHIFT (7)
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#define CR22_WAY_SHIFT (30)
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#define CR22_WAY_SHIFT_L2 (29)
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static DEFINE_SPINLOCK(cache_lock);
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static inline void cache_op_line(unsigned long i, unsigned int val)
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{
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mtcr("cr22", i);
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mtcr("cr17", val);
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}
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#define CCR2_L2E (1 << 3)
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static void cache_op_all(unsigned int value, unsigned int l2)
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{
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mtcr("cr17", value | CACHE_CLR);
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mb();
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if (l2 && (mfcr_ccr2() & CCR2_L2E)) {
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mtcr("cr24", value | CACHE_CLR);
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mb();
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}
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}
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static void cache_op_range(
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unsigned int start,
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unsigned int end,
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unsigned int value,
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unsigned int l2)
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{
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unsigned long i, flags;
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unsigned int val = value | CACHE_CLR | CACHE_OMS;
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bool l2_sync;
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if (unlikely((end - start) >= PAGE_SIZE) ||
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unlikely(start < PAGE_OFFSET) ||
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unlikely(start >= PAGE_OFFSET + LOWMEM_LIMIT)) {
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cache_op_all(value, l2);
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return;
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}
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if ((mfcr_ccr2() & CCR2_L2E) && l2)
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l2_sync = 1;
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else
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l2_sync = 0;
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spin_lock_irqsave(&cache_lock, flags);
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i = start & ~(L1_CACHE_BYTES - 1);
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for (; i < end; i += L1_CACHE_BYTES) {
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cache_op_line(i, val);
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if (l2_sync) {
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mb();
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mtcr("cr24", val);
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}
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}
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spin_unlock_irqrestore(&cache_lock, flags);
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mb();
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}
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void dcache_wb_line(unsigned long start)
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{
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asm volatile("idly4\n":::"memory");
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cache_op_line(start, DATA_CACHE|CACHE_CLR);
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mb();
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}
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void icache_inv_range(unsigned long start, unsigned long end)
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{
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cache_op_range(start, end, INS_CACHE|CACHE_INV, 0);
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}
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void icache_inv_all(void)
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{
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cache_op_all(INS_CACHE|CACHE_INV, 0);
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}
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void dcache_wb_range(unsigned long start, unsigned long end)
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{
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cache_op_range(start, end, DATA_CACHE|CACHE_CLR, 0);
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}
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void dcache_wbinv_all(void)
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{
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cache_op_all(DATA_CACHE|CACHE_CLR|CACHE_INV, 0);
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}
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void cache_wbinv_range(unsigned long start, unsigned long end)
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{
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cache_op_range(start, end, INS_CACHE|DATA_CACHE|CACHE_CLR|CACHE_INV, 0);
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}
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EXPORT_SYMBOL(cache_wbinv_range);
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void cache_wbinv_all(void)
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{
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cache_op_all(INS_CACHE|DATA_CACHE|CACHE_CLR|CACHE_INV, 0);
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}
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void dma_wbinv_range(unsigned long start, unsigned long end)
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{
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cache_op_range(start, end, DATA_CACHE|CACHE_CLR|CACHE_INV, 1);
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}
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void dma_wb_range(unsigned long start, unsigned long end)
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{
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cache_op_range(start, end, DATA_CACHE|CACHE_INV, 1);
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}
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