[PATCH] ARM: 2839/1: Remove XScale cache and TLB locking code

Patch from Deepak Saxena

The XScale locking code is not something that has been validated
on 2.6 and needs to be replaced with a more generic API to use
with other ARMs that support locking features.

Signed-off-by: Deepak Saxena <dsaxena@plexity.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mm/proc-xscale.S b/arch/arm/mm/proc-xscale.S
index 2d977b4..b88de27 100644 (file)
--- a/arch/arm/mm/proc-xscale.S
+++ b/arch/arm/mm/proc-xscale.S
@@ -370,142 +370,6 @@ ENTRY(cpu_xscale_dcache_clean_area)
        bhi     1b
        mov     pc, lr
 
-/* ================================ CACHE LOCKING============================
- *
- * The XScale MicroArchitecture implements support for locking entries into
- * the data and instruction cache.  The following functions implement the core
- * low level instructions needed to accomplish the locking.  The developer's
- * manual states that the code that performs the locking must be in non-cached
- * memory.  To accomplish this, the code in xscale-cache-lock.c copies the
- * following functions from the cache into a non-cached memory region that
- * is allocated through consistent_alloc().
- *
- */
-       .align  5
-/*
- * xscale_icache_lock
- *
- * r0: starting address to lock
- * r1: end address to lock
- */
-ENTRY(xscale_icache_lock)
-
-iLockLoop:
-       bic     r0, r0, #CACHELINESIZE - 1
-       mcr     p15, 0, r0, c9, c1, 0   @ lock into cache
-       cmp     r0, r1                  @ are we done?
-       add     r0, r0, #CACHELINESIZE  @ advance to next cache line
-       bls     iLockLoop
-       mov     pc, lr
-
-/*
- * xscale_icache_unlock
- */
-ENTRY(xscale_icache_unlock)
-       mcr     p15, 0, r0, c9, c1, 1   @ Unlock icache
-       mov     pc, lr
-
-/*
- * xscale_dcache_lock
- *
- * r0: starting address to lock
- * r1: end address to lock
- */
-ENTRY(xscale_dcache_lock)
-       mcr     p15, 0, ip, c7, c10, 4          @ Drain Write (& Fill) Buffer
-       mov     r2, #1
-       mcr     p15, 0, r2, c9, c2, 0   @ Put dcache in lock mode
-       cpwait  ip                      @ Wait for completion
-
-       mrs     r2, cpsr
-       orr     r3, r2, #PSR_F_BIT | PSR_I_BIT
-dLockLoop:
-       msr     cpsr_c, r3
-       mcr     p15, 0, r0, c7, c10, 1  @ Write back line if it is dirty
-       mcr     p15, 0, r0, c7, c6, 1   @ Flush/invalidate line
-       msr     cpsr_c, r2
-       ldr     ip, [r0], #CACHELINESIZE @ Preload 32 bytes into cache from
-                                       @ location [r0]. Post-increment
-                                       @ r3 to next cache line
-       cmp     r0, r1                  @ Are we done?
-       bls     dLockLoop
-
-       mcr     p15, 0, ip, c7, c10, 4          @ Drain Write (& Fill) Buffer
-       mov     r2, #0
-       mcr     p15, 0, r2, c9, c2, 0   @ Get out of lock mode
-       cpwait_ret lr, ip
-
-/*
- * xscale_dcache_unlock
- */
-ENTRY(xscale_dcache_unlock)
-       mcr     p15, 0, ip, c7, c10, 4          @ Drain Write (& Fill) Buffer
-       mcr     p15, 0, ip, c9, c2, 1   @ Unlock cache
-       mov     pc, lr
-
-/*
- * Needed to determine the length of the code that needs to be copied.
- */
-       .align  5
-ENTRY(xscale_cache_dummy)
-       mov     pc, lr
-
-/* ================================ TLB LOCKING==============================
- *
- * The XScale MicroArchitecture implements support for locking entries into
- * the Instruction and Data TLBs.  The following functions provide the
- * low level support for supporting these under Linux.  xscale-lock.c
- * implements some higher level management code.  Most of the following
- * is taken straight out of the Developer's Manual.
- */
-
-/*
- * Lock I-TLB entry
- *
- * r0: Virtual address to translate and lock
- */
-       .align  5
-ENTRY(xscale_itlb_lock)
-       mrs     r2, cpsr
-       orr     r3, r2, #PSR_F_BIT | PSR_I_BIT
-       msr     cpsr_c, r3                      @ Disable interrupts
-       mcr     p15, 0, r0, c8, c5, 1           @ Invalidate I-TLB entry
-       mcr     p15, 0, r0, c10, c4, 0          @ Translate and lock
-       msr     cpsr_c, r2                      @ Restore interrupts
-       cpwait_ret lr, ip
-
-/*
- * Lock D-TLB entry
- *
- * r0: Virtual address to translate and lock
- */
-       .align  5
-ENTRY(xscale_dtlb_lock)
-       mrs     r2, cpsr
-       orr     r3, r2, #PSR_F_BIT | PSR_I_BIT
-       msr     cpsr_c, r3                      @ Disable interrupts
-       mcr     p15, 0, r0, c8, c6, 1           @ Invalidate D-TLB entry
-       mcr     p15, 0, r0, c10, c8, 0          @ Translate and lock
-       msr     cpsr_c, r2                      @ Restore interrupts
-       cpwait_ret lr, ip
-
-/*
- * Unlock all I-TLB entries
- */
-       .align  5
-ENTRY(xscale_itlb_unlock)
-       mcr     p15, 0, ip, c10, c4, 1          @ Unlock I-TLB
-       mcr     p15, 0, ip, c8, c5, 0           @ Invalidate I-TLB
-       cpwait_ret lr, ip
-
-/*
- * Unlock all D-TLB entries
- */
-ENTRY(xscale_dtlb_unlock)
-       mcr     p15, 0, ip, c10, c8, 1          @ Unlock D-TBL
-       mcr     p15, 0, ip, c8, c6, 0           @ Invalidate D-TLB
-       cpwait_ret lr, ip
-
 /* =============================== PageTable ============================== */
 
 #define PTE_CACHE_WRITE_ALLOCATE 0