ARM: 8729/1: Hook B15 readahead cache functions based on processor

If we detect that we are running on a Broadcom Brahma-B15 CPU, and
CONFIG_CACHE_B15_RAC is enabled, make sure that we pick-up the
b15_cache_fns function operations.

If CONFIG_CACHE_B15_RAC is enabled, but we are not running on a Broadcom
Brahma-B15 CPU, we will fallback to calling into the regular
v7_cache_fns with no cost. If CONFIG_CACHE_B15_RAC is disabled, there is
no cost and we just use the regular v7_cache_fns.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S
index de78109..215df43 100644 (file)
--- a/arch/arm/mm/cache-v7.S
+++ b/arch/arm/mm/cache-v7.S
@@ -15,6 +15,7 @@
 #include <asm/assembler.h>
 #include <asm/errno.h>
 #include <asm/unwind.h>
+#include <asm/hardware/cache-b15-rac.h>
 
 #include "proc-macros.S"
 
@@ -446,3 +447,23 @@ ENDPROC(v7_dma_unmap_area)
 
        @ define struct cpu_cache_fns (see <asm/cacheflush.h> and proc-macros.S)
        define_cache_functions v7
+
+       /* The Broadcom Brahma-B15 read-ahead cache requires some modifications
+        * to the v7_cache_fns, we only override the ones we need
+        */
+#ifndef CONFIG_CACHE_B15_RAC
+       globl_equ       b15_flush_kern_cache_all,       v7_flush_kern_cache_all
+#endif
+       globl_equ       b15_flush_icache_all,           v7_flush_icache_all
+       globl_equ       b15_flush_kern_cache_louis,     v7_flush_kern_cache_louis
+       globl_equ       b15_flush_user_cache_all,       v7_flush_user_cache_all
+       globl_equ       b15_flush_user_cache_range,     v7_flush_user_cache_range
+       globl_equ       b15_coherent_kern_range,        v7_coherent_kern_range
+       globl_equ       b15_coherent_user_range,        v7_coherent_user_range
+       globl_equ       b15_flush_kern_dcache_area,     v7_flush_kern_dcache_area
+
+       globl_equ       b15_dma_map_area,               v7_dma_map_area
+       globl_equ       b15_dma_unmap_area,             v7_dma_unmap_area
+       globl_equ       b15_dma_flush_range,            v7_dma_flush_range
+
+       define_cache_functions b15

diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index 812ac86..d55d493 100644 (file)
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -678,7 +678,7 @@ __v7_ca15mp_proc_info:
 __v7_b15mp_proc_info:
        .long   0x420f00f0
        .long   0xff0ffff0
-       __v7_proc __v7_b15mp_proc_info, __v7_b15mp_setup
+       __v7_proc __v7_b15mp_proc_info, __v7_b15mp_setup, cache_fns = b15_cache_fns
        .size   __v7_b15mp_proc_info, . - __v7_b15mp_proc_info
 
        /*