From 6c310681379548ab1aa748e20da16a943fb0f234 Mon Sep 17 00:00:00 2001 From: Vineet Gupta Date: Thu, 4 Jun 2015 08:53:47 +0530 Subject: [PATCH] ARC: cacheflush: No need to retain DC_CTRL from __before_dc_op() That is because __after_dc_op() already reads it for status check, so it is better anyways to use that "newer" value. Also reduces the clutter in callers for passing from/to these routines. Signed-off-by: Vineet Gupta --- arch/arc/mm/cache.c | 39 +++++++++++++++++++-------------------- 1 file changed, 19 insertions(+), 20 deletions(-) diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c index 1ed3430bc155..82d24c337a0b 100644 --- a/arch/arc/mm/cache.c +++ b/arch/arc/mm/cache.c @@ -207,32 +207,33 @@ static inline void __cache_line_loop(unsigned long paddr, unsigned long vaddr, * Machine specific helpers for Entire D-Cache or Per Line ops */ -static inline unsigned int __before_dc_op(const int op) +static inline void __before_dc_op(const int op) { - unsigned int reg = reg; - if (op == OP_FLUSH_N_INV) { /* Dcache provides 2 cmd: FLUSH or INV * INV inturn has sub-modes: DISCARD or FLUSH-BEFORE * flush-n-inv is achieved by INV cmd but with IM=1 * So toggle INV sub-mode depending on op request and default */ - reg = read_aux_reg(ARC_REG_DC_CTRL); - write_aux_reg(ARC_REG_DC_CTRL, reg | DC_CTRL_INV_MODE_FLUSH) - ; + const unsigned int ctl = ARC_REG_DC_CTRL; + write_aux_reg(ctl, read_aux_reg(ctl) | DC_CTRL_INV_MODE_FLUSH); } - - return reg; } -static inline void __after_dc_op(const int op, unsigned int reg) +static inline void __after_dc_op(const int op) { - if (op & OP_FLUSH) /* flush / flush-n-inv both wait */ - while (read_aux_reg(ARC_REG_DC_CTRL) & DC_CTRL_FLUSH_STATUS); + if (op & OP_FLUSH) { + const unsigned int ctl = ARC_REG_DC_CTRL; + unsigned int reg; - /* Switch back to default Invalidate mode */ - if (op == OP_FLUSH_N_INV) - write_aux_reg(ARC_REG_DC_CTRL, reg & ~DC_CTRL_INV_MODE_FLUSH); + /* flush / flush-n-inv both wait */ + while ((reg = read_aux_reg(ctl)) & DC_CTRL_FLUSH_STATUS) + ; + + /* Switch back to default Invalidate mode */ + if (op == OP_FLUSH_N_INV) + write_aux_reg(ctl, reg & ~DC_CTRL_INV_MODE_FLUSH); + } } /* @@ -243,10 +244,9 @@ static inline void __after_dc_op(const int op, unsigned int reg) */ static inline void __dc_entire_op(const int op) { - unsigned int ctrl_reg; int aux; - ctrl_reg = __before_dc_op(op); + __before_dc_op(op); if (op & OP_INV) /* Inv or flush-n-inv use same cmd reg */ aux = ARC_REG_DC_IVDC; @@ -255,7 +255,7 @@ static inline void __dc_entire_op(const int op) write_aux_reg(aux, 0x1); - __after_dc_op(op, ctrl_reg); + __after_dc_op(op); } /* For kernel mappings cache operation: index is same as paddr */ @@ -268,15 +268,14 @@ static inline void __dc_line_op(unsigned long paddr, unsigned long vaddr, unsigned long sz, const int op) { unsigned long flags; - unsigned int ctrl_reg; local_irq_save(flags); - ctrl_reg = __before_dc_op(op); + __before_dc_op(op); __cache_line_loop(paddr, vaddr, sz, op); - __after_dc_op(op, ctrl_reg); + __after_dc_op(op); local_irq_restore(flags); } -- 2.34.1