+++ /dev/null
-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
-
-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.
-
-Signed-off-by: Rafał Miłecki <zajec5@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(+)
- 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
-@@ -44,6 +44,11 @@ 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)
- OBJS += head-sa1100.o
- endif
---- /dev/null
-+++ b/arch/arm/boot/compressed/head-bcm_5301x-mpcore.S
-@@ -0,0 +1,37 @@
-+/*
-+ *
-+ * Platform specific tweaks. This is merged into head.S by the linker.
-+ *
-+ */
-+
-+#include <linux/linkage.h>
-+#include <asm/assembler.h>
-+#include <asm/cp15.h>
-+
-+ .section ".start", "ax"
-+
-+/*
-+ * This code section is spliced into the head code by the linker
-+ */
-+
-+__plat_uncompress_start:
-+
-+ @ Preserve r8/r7 i.e. kernel entry values
-+ mov r12, r8
-+
-+ @ Clear MMU enable and Dcache enable bits
-+ mrc p15, 0, r0, c1, c0, 0 @ Read SCTLR
-+ bic r0, #CR_C|CR_M
-+ mcr p15, 0, r0, c1, c0, 0 @ Write SCTLR
-+ nop
-+
-+ @ Call the cache invalidation routine
-+ bl v7_all_dcache_invalidate
-+ nop
-+ mov r0,#0
-+ ldr r3, =0x19022000 @ L2 cache controller, control reg
-+ str r0, [r3, #0x100] @ Disable L2 cache
-+ nop
-+
-+ @ 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)
projects / 15.05 / openwrt.git / blobdiff