[PATCH v2 06/14] microblaze: cache: improve icache Kconfig options

[Ovidiu Panait]

Replace CONFIG_ICACHE with a Kconfig option more limited in scope -
XILINX_MICROBLAZE0_USE_WIC. It should be enabled if the processor supports
the "wic" (Write to Instruction Cache) instruction. It will be used to
guard "wic" invocations in microblaze cache code.

Signed-off-by: Ovidiu Panait <ovpan...@gmail.com>
---

Changes in v2:
- added CONFIG_SPL_XILINX_MICROBLAZE0_USE_WIC symbol

 arch/microblaze/Kconfig                 |  4 ----
 arch/microblaze/cpu/cache.c             |  6 +++---
 board/xilinx/microblaze-generic/Kconfig | 11 +++++++++++
 3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 5a2e91104f..a25a95a013 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -25,10 +25,6 @@ config TARGET_MICROBLAZE_GENERIC
 
 endchoice
 
-config ICACHE
-       bool "Enable icache support"
-       default y
-
 source "board/xilinx/Kconfig"
 source "board/xilinx/microblaze-generic/Kconfig"
 
diff --git a/arch/microblaze/cpu/cache.c b/arch/microblaze/cpu/cache.c
index 4e8e228a22..b6bbc215b3 100644
--- a/arch/microblaze/cpu/cache.c
+++ b/arch/microblaze/cpu/cache.c
@@ -58,14 +58,14 @@ void flush_cache(ulong addr, ulong size)
 {
        int i;
        for (i = 0; i < size; i += 4) {
-               asm volatile (
-#ifdef CONFIG_ICACHE
+               if (CONFIG_IS_ENABLED(XILINX_MICROBLAZE0_USE_WIC)) {
+                       asm volatile (
                                "wic    %0, r0;"
-#endif
                                "nop;"
                                :
                                : "r" (addr + i)
                                : "memory");
+               }
 
                if (CONFIG_IS_ENABLED(XILINX_MICROBLAZE0_USE_WDC)) {
                        asm volatile (
diff --git a/board/xilinx/microblaze-generic/Kconfig 
b/board/xilinx/microblaze-generic/Kconfig
index b00ce6f59a..98b4814b95 100644
--- a/board/xilinx/microblaze-generic/Kconfig
+++ b/board/xilinx/microblaze-generic/Kconfig
@@ -74,4 +74,15 @@ config SPL_XILINX_MICROBLAZE0_USE_WDC
        bool
        default XILINX_MICROBLAZE0_USE_WDC
 
+config XILINX_MICROBLAZE0_USE_WIC
+       bool "MicroBlaze wic instruction support"
+       default y
+       help
+         Enable this option if the MicroBlaze processor is configured with
+         support for the "wic" (Write to Instruction Cache) instruction.
+
+config SPL_XILINX_MICROBLAZE0_USE_WIC
+       bool
+       default XILINX_MICROBLAZE0_USE_WIC
+
 endif
-- 
2.25.1