ARM: remove bogus cp_delay() function

The cp_delay() function was introduced because of a missing 'volatile'
attribute to the 'asm' statement in get_cr() which led to the 'mrc'
instruction in get_cr() being optimised out eventually.
This has been fixed in commit 53fd4b8c22bb ("arm: mmu: Add missing volatile for reading SCTLR register")
but the bogus cp_delay() function which was introduced as a workaround
for the malfunctioning get_cr() was never removed.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>

diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c
index cf852c061b4069a3311b968008dd1533d8ee0a20..f0c1b03728be3bca6ff16e0ded0abb4eeb19abae 100644 (file)
--- a/arch/arm/lib/cache-cp15.c
+++ b/arch/arm/lib/cache-cp15.c
@@ -22,16 +22,6 @@ __weak void arm_init_domains(void)
 {
 }
 
-static void cp_delay (void)
-{
-       volatile int i;
-
-       /* copro seems to need some delay between reading and writing */
-       for (i = 0; i < 100; i++)
-               nop();
-       asm volatile("" : : : "memory");
-}
-
 void set_section_dcache(int section, enum dcache_option option)
 {
 #ifdef CONFIG_ARMV7_LPAE
@@ -205,7 +195,6 @@ static inline void mmu_setup(void)
 
        /* and enable the mmu */
        reg = get_cr(); /* get control reg. */
-       cp_delay();
        set_cr(reg | CR_M);
 }
 
@@ -223,7 +212,6 @@ static void cache_enable(uint32_t cache_bit)
        if ((cache_bit == CR_C) && !mmu_enabled())
                mmu_setup();
        reg = get_cr(); /* get control reg. */
-       cp_delay();
        set_cr(reg | cache_bit);
 }
 
@@ -233,7 +221,6 @@ static void cache_disable(uint32_t cache_bit)
        uint32_t reg;
 
        reg = get_cr();
-       cp_delay();
 
        if (cache_bit == CR_C) {
                /* if cache isn;t enabled no need to disable */
@@ -243,7 +230,7 @@ static void cache_disable(uint32_t cache_bit)
                cache_bit |= CR_M;
        }
        reg = get_cr();
-       cp_delay();
+
        if (cache_bit == (CR_C | CR_M))
                flush_dcache_all();
        set_cr(reg & ~cache_bit);