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ARCv2: SLC: provide a line based flush routine for debugging
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
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9f82e90a66
commit
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2 changed files with 55 additions and 1 deletions
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@ -96,6 +96,8 @@ extern unsigned long perip_base, perip_end;
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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_AUX_SLC_IVDL 0x910
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#define ARC_AUX_SLC_FLDL 0x912
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#define ARC_REG_SLC_RGN_START 0x914
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#define ARC_REG_SLC_RGN_START1 0x915
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#define ARC_REG_SLC_RGN_END 0x916
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@ -652,7 +652,7 @@ static void __ic_line_inv_vaddr(phys_addr_t paddr, unsigned long vaddr,
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#endif /* CONFIG_ARC_HAS_ICACHE */
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noinline void slc_op(phys_addr_t paddr, unsigned long sz, const int op)
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noinline void slc_op_rgn(phys_addr_t paddr, unsigned long sz, const int op)
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{
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#ifdef CONFIG_ISA_ARCV2
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/*
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@ -715,6 +715,58 @@ noinline void slc_op(phys_addr_t paddr, unsigned long sz, const int op)
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#endif
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}
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noinline void slc_op_line(phys_addr_t paddr, unsigned long sz, const int op)
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{
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#ifdef CONFIG_ISA_ARCV2
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/*
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* SLC is shared between all cores and concurrent aux operations from
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* multiple cores need to be serialized using a spinlock
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* A concurrent operation can be silently ignored and/or the old/new
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* operation can remain incomplete forever (lockup in SLC_CTRL_BUSY loop
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* below)
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*/
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static DEFINE_SPINLOCK(lock);
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const unsigned long SLC_LINE_MASK = ~(l2_line_sz - 1);
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unsigned int ctrl, cmd;
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unsigned long flags;
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int num_lines;
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spin_lock_irqsave(&lock, flags);
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ctrl = read_aux_reg(ARC_REG_SLC_CTRL);
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/* Don't rely on default value of IM bit */
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if (!(op & OP_FLUSH)) /* i.e. OP_INV */
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ctrl &= ~SLC_CTRL_IM; /* clear IM: Disable flush before Inv */
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else
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ctrl |= SLC_CTRL_IM;
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write_aux_reg(ARC_REG_SLC_CTRL, ctrl);
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cmd = op & OP_INV ? ARC_AUX_SLC_IVDL : ARC_AUX_SLC_FLDL;
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sz += paddr & ~SLC_LINE_MASK;
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paddr &= SLC_LINE_MASK;
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num_lines = DIV_ROUND_UP(sz, l2_line_sz);
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while (num_lines-- > 0) {
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write_aux_reg(cmd, paddr);
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paddr += l2_line_sz;
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}
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/* Make sure "busy" bit reports correct stataus, see STAR 9001165532 */
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read_aux_reg(ARC_REG_SLC_CTRL);
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while (read_aux_reg(ARC_REG_SLC_CTRL) & SLC_CTRL_BUSY);
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spin_unlock_irqrestore(&lock, flags);
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#endif
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}
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#define slc_op(paddr, sz, op) slc_op_rgn(paddr, sz, op)
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noinline static void slc_entire_op(const int op)
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{
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unsigned int ctrl, r = ARC_REG_SLC_CTRL;
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