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authorVineet Gupta <vgupta@synopsys.com>2016-06-22 15:43:22 +0530
committerVineet Gupta <vgupta@synopsys.com>2017-01-18 14:35:10 -0800
commitd4911cdd3270da45d3a1c55bf28e88a932bbba7b (patch)
tree6fc1514bb32dbaa0b27441857d973e5613b2227d /arch
parenteb1357d942e5d96de6b4c20a8ffa55acf96233a2 (diff)
downloadlinux-d4911cdd3270da45d3a1c55bf28e88a932bbba7b.tar.bz2
ARCv2: IOC: refactor the IOC and SLC operations into own functions
- Move IOC setup into arc_ioc_setup() - Move SLC disabling into arc_slc_disable() Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/arc/include/asm/cache.h2
-rw-r--r--arch/arc/mm/cache.c68
2 files changed, 48 insertions, 22 deletions
diff --git a/arch/arc/include/asm/cache.h b/arch/arc/include/asm/cache.h
index b3410ff6a62d..5f924a1024fa 100644
--- a/arch/arc/include/asm/cache.h
+++ b/arch/arc/include/asm/cache.h
@@ -92,8 +92,8 @@ extern unsigned long perip_base, perip_end;
#define ARC_REG_SLC_RGN_END 0x916
/* Bit val in SLC_CONTROL */
+#define SLC_CTRL_DIS 0x001
#define SLC_CTRL_IM 0x040
-#define SLC_CTRL_DISABLE 0x001
#define SLC_CTRL_BUSY 0x100
#define SLC_CTRL_RGN_OP_INV 0x200
diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c
index 6d98e1d57a18..2c36370a1689 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -601,6 +601,40 @@ noinline void slc_op(phys_addr_t paddr, unsigned long sz, const int op)
#endif
}
+noinline static void slc_entire_op(const int op)
+{
+ unsigned int ctrl, r = ARC_REG_SLC_CTRL;
+
+ ctrl = read_aux_reg(r);
+
+ if (!(op & OP_FLUSH)) /* i.e. OP_INV */
+ ctrl &= ~SLC_CTRL_IM; /* clear IM: Disable flush before Inv */
+ else
+ ctrl |= SLC_CTRL_IM;
+
+ write_aux_reg(r, ctrl);
+
+ write_aux_reg(ARC_REG_SLC_INVALIDATE, 1);
+
+ /* Important to wait for flush to complete */
+ while (read_aux_reg(r) & SLC_CTRL_BUSY);
+}
+
+static inline void arc_slc_disable(void)
+{
+ const int r = ARC_REG_SLC_CTRL;
+
+ slc_entire_op(OP_FLUSH_N_INV);
+ write_aux_reg(r, read_aux_reg(r) | SLC_CTRL_DIS);
+}
+
+static inline void arc_slc_enable(void)
+{
+ const int r = ARC_REG_SLC_CTRL;
+
+ write_aux_reg(r, read_aux_reg(r) & ~SLC_CTRL_DIS);
+}
+
/***********************************************************
* Exported APIs
*/
@@ -927,6 +961,14 @@ SYSCALL_DEFINE3(cacheflush, uint32_t, start, uint32_t, sz, uint32_t, flags)
return 0;
}
+noinline void arc_ioc_setup(void)
+{
+ write_aux_reg(ARC_REG_IO_COH_AP0_BASE, 0x80000);
+ write_aux_reg(ARC_REG_IO_COH_AP0_SIZE, 0x11);
+ write_aux_reg(ARC_REG_IO_COH_PARTIAL, 1);
+ write_aux_reg(ARC_REG_IO_COH_ENABLE, 1);
+}
+
void arc_cache_init(void)
{
unsigned int __maybe_unused cpu = smp_processor_id();
@@ -989,30 +1031,14 @@ 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);
+ /* Note that SLC disable not formally supported till HS 3.0 */
+ if (is_isa_arcv2() && l2_line_sz && !slc_enable)
+ arc_slc_disable();
- 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_enable)
+ arc_ioc_setup();
if (is_isa_arcv2() && ioc_enable) {
- /* IO coherency base - 0x8z */
- write_aux_reg(ARC_REG_IO_COH_AP0_BASE, 0x80000);
- /* IO coherency aperture size - 512Mb: 0x8z-0xAz */
- write_aux_reg(ARC_REG_IO_COH_AP0_SIZE, 0x11);
- /* Enable partial writes */
- write_aux_reg(ARC_REG_IO_COH_PARTIAL, 1);
- /* Enable IO coherency */
- write_aux_reg(ARC_REG_IO_COH_ENABLE, 1);
-
__dma_cache_wback_inv = __dma_cache_wback_inv_ioc;
__dma_cache_inv = __dma_cache_inv_ioc;
__dma_cache_wback = __dma_cache_wback_ioc;