From ac96a1665ac74123f92bd7ec0154da186d918981 Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 26 Jul 2015 15:52:59 +0000
Subject: [PATCH] bcm53xx: update Disable MMU and Dcache during decompression

This replaces the old patch with the version from Florian.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

SVN-Revision: 46504
---
 ...ble-MMU-and-Dcache-for-decompression.patch | 169 ++++--------------
 1 file 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 bc5757fb11..62bda2e830 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
-- 
2.30.2