diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.1/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.1/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch | 169 |
1 files changed, 30 insertions, 139 deletions
diff --git a/target/linux/bcm53xx/patches-4.1/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch b/target/linux/bcm53xx/patches-4.1/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch index bc5757f..62bda2e 100644 --- a/target/linux/bcm53xx/patches-4.1/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch +++ b/target/linux/bcm53xx/patches-4.1/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch @@ -1,32 +1,26 @@ -From 26023cdfacaf116545b1087b9d1fe50dc6fbda10 Mon Sep 17 00:00:00 2001 -From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com> -Date: Wed, 24 Sep 2014 22:14:07 +0200 -Subject: [PATCH] ARM: BCM5301X: Disable MMU and Dcache for decompression -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit +From: Florian Fainelli <f.fainelli@gmail.com> +Subject: [PATCH] ARM: BCM5301x: Disable MMU and Dcache during decompression +Date: Tue, 14 Jul 2015 16:12:08 -0700 -Without this fix kernel was randomly hanging in ~25% of tries during -early init. Hangs used to happen at random places in the start_kernel. +Use the existing __armv7_mmu_cache_flush() to perform the cache flush +since this does what we are after. -Signed-off-by: Rafał Miłecki <zajec5@gmail.com> +Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> --- - arch/arm/boot/compressed/Makefile | 5 + - arch/arm/boot/compressed/head-bcm_5301x-mpcore.S | 37 +++++++ - arch/arm/boot/compressed/mpcore_cache.S | 118 +++++++++++++++++++++++ - 3 files changed, 160 insertions(+) + arch/arm/boot/compressed/Makefile | 4 +++ + arch/arm/boot/compressed/head-bcm_5301x-mpcore.S | 37 ++++++++++++++++++++++++ + arch/arm/boot/compressed/head.S | 2 ++ + 3 files changed, 43 insertions(+) create mode 100644 arch/arm/boot/compressed/head-bcm_5301x-mpcore.S - create mode 100644 arch/arm/boot/compressed/mpcore_cache.S --- a/arch/arm/boot/compressed/Makefile +++ b/arch/arm/boot/compressed/Makefile -@@ -31,6 +31,11 @@ ifeq ($(CONFIG_ARCH_ACORN),y) +@@ -31,6 +31,10 @@ ifeq ($(CONFIG_ARCH_ACORN),y) OBJS += ll_char_wr.o font.o endif +ifeq ($(CONFIG_ARCH_BCM_5301X),y) +OBJS += head-bcm_5301x-mpcore.o -+OBJS += mpcore_cache.o +endif + ifeq ($(CONFIG_ARCH_SA1100),y) @@ -63,7 +57,7 @@ Signed-off-by: Rafał Miłecki <zajec5@gmail.com> + nop + + @ Call the cache invalidation routine -+ bl v7_all_dcache_invalidate ++ bl __armv7_mmu_cache_flush_fn + nop + mov r0,#0 + ldr r3, =0x19022000 @ L2 cache controller, control reg @@ -72,124 +66,21 @@ Signed-off-by: Rafał Miłecki <zajec5@gmail.com> + + @ Restore + mov r8, r12 ---- /dev/null -+++ b/arch/arm/boot/compressed/mpcore_cache.S -@@ -0,0 +1,118 @@ -+/***************************************************************************** -+* Copyright 2003 - 2008 Broadcom Corporation. All rights reserved. -+* -+* Unless you and Broadcom execute a separate written software license -+* agreement governing use of this software, this software is licensed to you -+* under the terms of the GNU General Public License version 2, available at -+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL"). -+* -+* Notwithstanding the above, under no circumstances may you combine this -+* software in any way with any other Broadcom software provided under a -+* license other than the GPL, without Broadcom's express prior written -+* consent. -+*****************************************************************************/ -+ -+#include <linux/linkage.h> -+#include <linux/init.h> -+ -+ __INIT -+ -+/* -+ * v7_l1_cache_invalidate -+ * -+ * Invalidate contents of L1 cache without flushing its contents -+ * into outer cache and memory. This is needed when the contents -+ * of the cache are unpredictable after power-up. -+ * -+ * corrupts r0-r6 -+ */ -+ -+ENTRY(v7_l1_cache_invalidate) -+ mov r0, #0 -+ mcr p15, 2, r0, c0, c0, 0 @ set cache level to 1 -+ mrc p15, 1, r0, c0, c0, 0 @ read CLIDR -+ -+ ldr r1, =0x7fff -+ and r2, r1, r0, lsr #13 @ get max # of index size -+ -+ ldr r1, =0x3ff -+ and r3, r1, r0, lsr #3 @ NumWays - 1 -+ add r2, r2, #1 @ NumSets -+ -+ and r0, r0, #0x7 -+ add r0, r0, #4 @ SetShift -+ -+ clz r1, r3 @ WayShift -+ add r4, r3, #1 @ NumWays -+1: sub r2, r2, #1 @ NumSets-- -+ mov r3, r4 @ Temp = NumWays -+2: subs r3, r3, #1 @ Temp-- -+ mov r5, r3, lsl r1 -+ mov r6, r2, lsl r0 -+ orr r5, r5, r6 @ Reg = (Temp<<WayShift)|(NumSets<<SetShift) -+ mcr p15, 0, r5, c7, c6, 2 @ Invalidate line -+ bgt 2b -+ cmp r2, #0 -+ bgt 1b -+ dsb -+ mov r0,#0 -+ mcr p15,0,r0,c7,c5,0 /* Invalidate icache */ -+ isb -+ mov pc, lr -+ENDPROC(v7_l1_cache_invalidate) -+ -+/* -+ * v7_all_dcache_invalidate -+ * -+ * Invalidate without flushing the contents of all cache levels -+ * accesible by the current processor core. -+ * This is useful when the contents of cache memory are undetermined -+ * at power-up. -+ * Corrupted registers: r0-r7, r9-r11 -+ * -+ * Based on cache-v7.S: v7_flush_dcache_all() -+ */ -+ -+ENTRY(v7_all_dcache_invalidate) -+ mrc p15, 1, r0, c0, c0, 1 @ read clidr -+ ands r3, r0, #0x7000000 @ extract loc from clidr -+ mov r3, r3, lsr #23 @ left align loc bit field -+ beq finished @ if loc is 0, then no need to clean -+ mov r10, #0 @ start clean at cache level 0 -+loop1: -+ add r2, r10, r10, lsr #1 @ work out 3x current cache level -+ mov r1, r0, lsr r2 @ extract cache type bits from clidr -+ and r1, r1, #7 @ mask of bits for current cache only -+ cmp r1, #2 @ see what cache we have at this level -+ blt skip @ skip if no cache, or just i-cache -+ mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr -+ isb @ isb to sych the new cssr&csidr -+ mrc p15, 1, r1, c0, c0, 0 @ read the new csidr -+ and r2, r1, #7 @ extract the length of the cache lines -+ add r2, r2, #4 @ add 4 (line length offset) -+ ldr r4, =0x3ff -+ ands r4, r4, r1, lsr #3 @ find maximum number on the way size -+ clz r5, r4 @ find bit pos of way size increment -+ ldr r7, =0x7fff -+ ands r7, r7, r1, lsr #13 @ extract max number of the index size -+loop2: -+ mov r9, r4 @ create working copy of max way size -+loop3: -+ orr r11, r10, r9, lsl r5 @ factor way and cache number into r11 -+ orr r11, r11, r7, lsl r2 @ factor index number into r11 -+ mcr p15, 0, r11, c7, c6, 2 @ Invalidate line -+ subs r9, r9, #1 @ decrement the way -+ bge loop3 -+ subs r7, r7, #1 @ decrement the index -+ bge loop2 -+skip: -+ add r10, r10, #2 @ increment cache number -+ cmp r3, r10 -+ bgt loop1 -+finished: -+ mov r10, #0 @ swith back to cache level 0 -+ mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr -+ dsb -+ isb -+ mov pc, lr -+ENDPROC(v7_all_dcache_invalidate) +--- a/arch/arm/boot/compressed/head.S ++++ b/arch/arm/boot/compressed/head.S +@@ -1152,6 +1152,7 @@ __armv7_mmu_cache_flush: + hierarchical: + mcr p15, 0, r10, c7, c10, 5 @ DMB + stmfd sp!, {r0-r7, r9-r11} ++ENTRY(__armv7_mmu_cache_flush_fn) + mrc p15, 1, r0, c0, c0, 1 @ read clidr + ands r3, r0, #0x7000000 @ extract loc from clidr + mov r3, r3, lsr #23 @ left align loc bit field +@@ -1201,6 +1202,7 @@ iflush: + mcr p15, 0, r10, c7, c10, 4 @ DSB + mcr p15, 0, r10, c7, c5, 4 @ ISB + mov pc, lr ++ENDPROC(__armv7_mmu_cache_flush_fn) + + __armv5tej_mmu_cache_flush: + tst r4, #1 |