@@ -116,6 +116,24 @@ config SYS_DCACHE_OFF
bool "Do not use Data Cache"
default n
+menuconfig ARC_DBG
+ bool "ARC debugging"
+ default n
+
+if ARC_DBG
+
+config ARC_DBG_IOC_ENABLE
+ bool "Enable IO coherency unit"
+ depends on CPU_ARCHS38
+ default n
+ help
+ Enable IO coherency unit to debug problems with caches and
+ DMA peripherals.
+ NOTE: as of today linux will not work properly if this option
+ is enabled in u-boot!
+
+endif
+
choice
prompt "Target select"
default TARGET_AXS103
@@ -32,6 +32,11 @@
void cache_init(void);
void flush_n_invalidate_dcache_all(void);
+static const inline int is_ioc_enabled(void)
+{
+ return IS_ENABLED(CONFIG_ARC_DBG_IOC_ENABLE);
+}
+
#endif /* __ASSEMBLY__ */
#endif /* __ASM_ARC_CACHE_H */
@@ -107,18 +107,8 @@ DECLARE_GLOBAL_DATA_PTR;
#define SLC_CTRL_BUSY 0x100
#define SLC_CTRL_RGN_OP_INV 0x200
-/*
- * By default that variable will fall into .bss section.
- * But .bss section is not relocated and so it will be initilized before
- * relocation but will be used after being zeroed.
- */
#define CACHE_LINE_MASK (~(gd->arch.l1_line_sz - 1))
-bool ioc_exists __section(".data") = false;
-
-/* To force enable IOC set ioc_enable to 'true' */
-bool ioc_enable __section(".data") = false;
-
static inline bool pae_exists(void)
{
/* TODO: should we compare mmu version from BCR and from CONFIG? */
@@ -162,6 +152,30 @@ static inline bool slc_exists(void)
return false;
}
+static inline bool ioc_exists(void)
+{
+ if (is_isa_arcv2()) {
+ union bcr_clust_cfg cbcr;
+
+ cbcr.word = read_aux_reg(ARC_BCR_CLUSTER);
+ return cbcr.fields.c;
+ }
+
+ return false;
+}
+
+static inline bool ioc_enabled(void)
+{
+ /*
+ * We check only CONFIG option instead of IOC HW state check as IOC
+ * must be disabled by default.
+ */
+ if (is_ioc_enabled())
+ return ioc_exists();
+
+ return false;
+}
+
static void __slc_entire_op(const int op)
{
unsigned int ctrl;
@@ -295,17 +309,12 @@ static void read_decode_cache_bcr_arcv2(void)
#ifdef CONFIG_ISA_ARCV2
union bcr_slc_cfg slc_cfg;
- union bcr_clust_cfg cbcr;
if (slc_exists()) {
slc_cfg.word = read_aux_reg(ARC_AUX_SLC_CONFIG);
gd->arch.slc_line_sz = (slc_cfg.fields.lsz == 0) ? 128 : 64;
}
- cbcr.word = read_aux_reg(ARC_BCR_CLUSTER);
- if (cbcr.fields.c && ioc_enable)
- ioc_exists = true;
-
#endif /* CONFIG_ISA_ARCV2 */
}
@@ -339,7 +348,7 @@ void cache_init(void)
if (is_isa_arcv2())
read_decode_cache_bcr_arcv2();
- if (is_isa_arcv2() && ioc_exists)
+ if (is_isa_arcv2() && ioc_enabled())
arc_ioc_setup();
if (is_isa_arcv2() && slc_exists())
@@ -511,10 +520,10 @@ void invalidate_dcache_range(unsigned long start, unsigned long end)
* ARCv2 && no IOC -> call __dc_line_op; call __slc_rgn_op
* ARCv2 && IOC enabled -> nothing
*/
- if (!is_isa_arcv2() || !ioc_exists)
+ if (!is_isa_arcv2() || !ioc_enabled())
__dc_line_op(start, end - start, OP_INV);
- if (is_isa_arcv2() && !ioc_exists)
+ if (is_isa_arcv2() && !ioc_enabled())
__slc_rgn_op(start, end - start, OP_INV);
}
@@ -528,10 +537,10 @@ void flush_dcache_range(unsigned long start, unsigned long end)
* ARCv2 && no IOC -> call __dc_line_op; call __slc_rgn_op
* ARCv2 && IOC enabled -> nothing
*/
- if (!is_isa_arcv2() || !ioc_exists)
+ if (!is_isa_arcv2() || !ioc_enabled())
__dc_line_op(start, end - start, OP_FLUSH);
- if (is_isa_arcv2() && !ioc_exists)
+ if (is_isa_arcv2() && !ioc_enabled())
__slc_rgn_op(start, end - start, OP_FLUSH);
}
Use CONFIG_ARC_DBG_IOC_ENABLE Kconfig option instead of ioc_enable global variable. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> --- arch/arc/Kconfig | 18 ++++++++++++++++ arch/arc/include/asm/cache.h | 5 +++++ arch/arc/lib/cache.c | 49 ++++++++++++++++++++++++++------------------ 3 files changed, 52 insertions(+), 20 deletions(-)