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| author | Vineet Gupta <vgupta@synopsys.com> | 2015-06-04 15:00:23 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-08-20 14:41:52 +0200 |
| commit | 79335a2ca03fdd883823e068b5e2f89a8ee47839 (patch) | |
| tree | 478f293e8696aefe6568f465426842ab80fd9b48 /arch/arc/mm | |
| parent | ARCv2: Support IO Coherency and permutations involving L1 and L2 caches (diff) | |
| download | linux-79335a2ca03fdd883823e068b5e2f89a8ee47839.tar.xz linux-79335a2ca03fdd883823e068b5e2f89a8ee47839.zip | |
ARCv2: SLC: Allow boot time disable
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/mm')
| -rw-r--r-- | arch/arc/mm/cache.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c index 25e7077d4c04..7c424e3f980d 100644 --- a/arch/arc/mm/cache.c +++ b/arch/arc/mm/cache.c @@ -23,6 +23,7 @@ static int l2_line_sz; int ioc_exists; +volatile int slc_enable = 1; void (*_cache_line_loop_ic_fn)(unsigned long paddr, unsigned long vaddr, unsigned long sz, const int cacheop); @@ -36,6 +37,7 @@ char *arc_cache_mumbojumbo(int c, char *buf, int len) int n = 0; struct cpuinfo_arc_cache *p; +#define IS_USED_RUN(v) ((v) ? "" : "(disabled) ") #define PR_CACHE(p, cfg, str) \ if (!(p)->ver) \ n += scnprintf(buf + n, len - n, str"\t\t: N/A\n"); \ @@ -53,7 +55,8 @@ char *arc_cache_mumbojumbo(int c, char *buf, int len) p = &cpuinfo_arc700[c].slc; if (p->ver) n += scnprintf(buf + n, len - n, - "SLC\t\t: %uK, %uB Line\n", p->sz_k, p->line_len); + "SLC\t\t: %uK, %uB Line%s\n", + p->sz_k, p->line_len, IS_USED_RUN(slc_enable)); if (ioc_exists) n += scnprintf(buf + n, len - n, "IOC\t\t: exists\n"); @@ -908,6 +911,20 @@ void arc_cache_init(void) } } + if (is_isa_arcv2() && l2_line_sz && !slc_enable) { + + /* IM set : flush before invalidate */ + write_aux_reg(ARC_REG_SLC_CTRL, + read_aux_reg(ARC_REG_SLC_CTRL) | SLC_CTRL_IM); + + write_aux_reg(ARC_REG_SLC_INVALIDATE, 1); + + /* Important to wait for flush to complete */ + while (read_aux_reg(ARC_REG_SLC_CTRL) & SLC_CTRL_BUSY); + write_aux_reg(ARC_REG_SLC_CTRL, + read_aux_reg(ARC_REG_SLC_CTRL) | SLC_CTRL_DISABLE); + } + if (is_isa_arcv2() && ioc_exists) { /* IO coherency base - 0x8z */ write_aux_reg(ARC_REG_IO_COH_AP0_BASE, 0x80000); @@ -921,7 +938,7 @@ void arc_cache_init(void) __dma_cache_wback_inv = __dma_cache_wback_inv_ioc; __dma_cache_inv = __dma_cache_inv_ioc; __dma_cache_wback = __dma_cache_wback_ioc; - } else if (is_isa_arcv2() && l2_line_sz) { + } else if (is_isa_arcv2() && l2_line_sz && slc_enable) { __dma_cache_wback_inv = __dma_cache_wback_inv_slc; __dma_cache_inv = __dma_cache_inv_slc; __dma_cache_wback = __dma_cache_wback_slc; |