mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 08:21:14 +00:00
7fc9bb1aca
This adds initial support for kernel 3.18. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> SVN-Revision: 43097
196 lines
5.9 KiB
Diff
196 lines
5.9 KiB
Diff
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
|
|
@@ -46,6 +46,11 @@ 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)
|