f2b0b25a37
In case of ARCv2 CPU there're could be following configurations
that affect cache handling for data exchanged with peripherals
via DMA:
[1] Only L1 cache exists
[2] Both L1 and L2 exist, but no IO coherency unit
[3] L1, L2 caches and IO coherency unit exist
Current implementation takes care of [1] and [2].
Moreover support of [2] is implemented with run-time check
for SLC existence which is not super optimal.
This patch introduces support of [3] and rework of DMA ops
usage. Instead of doing run-time check every time a particular
DMA op is executed we'll have 3 different implementations of
DMA ops and select appropriate one during init.
As for IOC support for it we need:
[a] Implement empty DMA ops because IOC takes care of cache
coherency with DMAed data
[b] Route dma_alloc_coherent() via dma_alloc_noncoherent()
This is required to make IOC work in first place and also
serves as optimization as LD/ST to coherent buffers can be
srviced from caches w/o going all the way to memory
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
[vgupta:
-Added some comments about IOC gains
-Marked dma ops as static,
-Massaged changelog a bit]
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ARC_ASM_CACHE_H
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#define __ARC_ASM_CACHE_H
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/* In case $$ not config, setup a dummy number for rest of kernel */
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#ifndef CONFIG_ARC_CACHE_LINE_SHIFT
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#define L1_CACHE_SHIFT 6
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#else
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#define L1_CACHE_SHIFT CONFIG_ARC_CACHE_LINE_SHIFT
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#endif
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#define L1_CACHE_BYTES (1 << L1_CACHE_SHIFT)
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#define CACHE_LINE_MASK (~(L1_CACHE_BYTES - 1))
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/*
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* ARC700 doesn't cache any access in top 1G (0xc000_0000 to 0xFFFF_FFFF)
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* Ideal for wiring memory mapped peripherals as we don't need to do
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* explicit uncached accesses (LD.di/ST.di) hence more portable drivers
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*/
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#define ARC_UNCACHED_ADDR_SPACE 0xc0000000
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#ifndef __ASSEMBLY__
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/* Uncached access macros */
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#define arc_read_uncached_32(ptr) \
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({ \
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unsigned int __ret; \
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__asm__ __volatile__( \
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" ld.di %0, [%1] \n" \
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: "=r"(__ret) \
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: "r"(ptr)); \
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__ret; \
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})
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#define arc_write_uncached_32(ptr, data)\
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({ \
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__asm__ __volatile__( \
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" st.di %0, [%1] \n" \
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: \
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: "r"(data), "r"(ptr)); \
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})
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#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
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extern void arc_cache_init(void);
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extern char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len);
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extern void read_decode_cache_bcr(void);
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extern int ioc_exists;
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#endif /* !__ASSEMBLY__ */
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/* Instruction cache related Auxiliary registers */
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#define ARC_REG_IC_BCR 0x77 /* Build Config reg */
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#define ARC_REG_IC_IVIC 0x10
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#define ARC_REG_IC_CTRL 0x11
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#define ARC_REG_IC_IVIL 0x19
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#if defined(CONFIG_ARC_MMU_V3) || defined(CONFIG_ARC_MMU_V4)
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#define ARC_REG_IC_PTAG 0x1E
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#endif
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/* Bit val in IC_CTRL */
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#define IC_CTRL_CACHE_DISABLE 0x1
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/* Data cache related Auxiliary registers */
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#define ARC_REG_DC_BCR 0x72 /* Build Config reg */
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#define ARC_REG_DC_IVDC 0x47
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#define ARC_REG_DC_CTRL 0x48
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#define ARC_REG_DC_IVDL 0x4A
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#define ARC_REG_DC_FLSH 0x4B
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#define ARC_REG_DC_FLDL 0x4C
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#define ARC_REG_DC_PTAG 0x5C
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/* Bit val in DC_CTRL */
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#define DC_CTRL_INV_MODE_FLUSH 0x40
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#define DC_CTRL_FLUSH_STATUS 0x100
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/*System-level cache (L2 cache) related Auxiliary registers */
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#define ARC_REG_SLC_CFG 0x901
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#define ARC_REG_SLC_CTRL 0x903
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#define ARC_REG_SLC_FLUSH 0x904
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#define ARC_REG_SLC_INVALIDATE 0x905
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#define ARC_REG_SLC_RGN_START 0x914
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#define ARC_REG_SLC_RGN_END 0x916
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/* Bit val in SLC_CONTROL */
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#define SLC_CTRL_IM 0x040
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#define SLC_CTRL_DISABLE 0x001
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#define SLC_CTRL_BUSY 0x100
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#define SLC_CTRL_RGN_OP_INV 0x200
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/* IO coherency related Auxiliary registers */
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#define ARC_REG_IO_COH_ENABLE 0x500
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#define ARC_REG_IO_COH_PARTIAL 0x501
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#define ARC_REG_IO_COH_AP0_BASE 0x508
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#define ARC_REG_IO_COH_AP0_SIZE 0x509
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#endif /* _ASM_CACHE_H */
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