From: David Howells <dhowells@redhat.com>
To: linux-am33-list@redhat.com
Cc: linux-kernel@vger.kernel.org,
Akira Takeuchi <takeuchi.akr@jp.panasonic.com>,
Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Subject: [PATCH 24/43] MN10300: Make the boot wrapper able to use writeback caching
Date: Tue, 26 Oct 2010 03:55:09 +0100 [thread overview]
Message-ID: <20101026025509.23512.307.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <20101026025301.23512.24525.stgit@warthog.procyon.org.uk>
From: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Make the boot wrapper able to use writeback caching, including flushing the
cache before jumping to the main kernel.
Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
---
arch/mn10300/boot/compressed/head.S | 49 ++++++++++++++++++++++++++++++++++-
1 files changed, 48 insertions(+), 1 deletions(-)
diff --git a/arch/mn10300/boot/compressed/head.S b/arch/mn10300/boot/compressed/head.S
index 502e1eb..4ef608a 100644
--- a/arch/mn10300/boot/compressed/head.S
+++ b/arch/mn10300/boot/compressed/head.S
@@ -14,6 +14,7 @@
#include <linux/linkage.h>
#include <asm/cpu-regs.h>
+#include <asm/cache.h>
.globl startup_32
startup_32:
@@ -37,8 +38,15 @@ startup_32:
mov (a0),d0
btst CHCTR_ICBUSY|CHCTR_DCBUSY,d0 # wait till not busy
lne
- mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD,d0 # writethru dcache
+
+#ifdef CONFIG_MN10300_CACHE_ENABLED
+#ifdef CONFIG_MN10300_CACHE_WBACK
+ mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRBACK,d0
+#else
+ mov CHCTR_ICEN|CHCTR_DCEN|CHCTR_DCWTMD_WRTHROUGH,d0
+#endif /* WBACK */
movhu d0,(a0) # enable
+#endif /* !ENABLED */
# clear the BSS area
mov __bss_start,a0
@@ -54,6 +62,9 @@ bssclear_end:
# decompress the kernel
call decompress_kernel[],0
+#ifdef CONFIG_MN10300_CACHE_WBACK
+ call mn10300_dcache_flush_inv[],0
+#endif
# disable caches again
mov CHCTR,a0
@@ -69,10 +80,46 @@ bssclear_end:
mov (4,a0),d1
mov (8,a0),d2
+ # jump to the kernel proper entry point
mov a3,sp
mov CONFIG_KERNEL_TEXT_ADDRESS,a0
jmp (a0)
+
+###############################################################################
+#
+# Cache flush routines
+#
+###############################################################################
+#ifdef CONFIG_MN10300_CACHE_WBACK
+mn10300_dcache_flush_inv:
+ movhu (CHCTR),d0
+ btst CHCTR_DCEN,d0
+ beq mn10300_dcache_flush_inv_end
+
+ mov L1_CACHE_NENTRIES,d1
+ clr a1
+
+mn10300_dcache_flush_inv_loop:
+ mov (DCACHE_PURGE_WAY0(0),a1),d0 # unconditional purge
+ mov (DCACHE_PURGE_WAY1(0),a1),d0 # unconditional purge
+ mov (DCACHE_PURGE_WAY2(0),a1),d0 # unconditional purge
+ mov (DCACHE_PURGE_WAY3(0),a1),d0 # unconditional purge
+
+ add L1_CACHE_BYTES,a1
+ add -1,d1
+ bne mn10300_dcache_flush_inv_loop
+
+mn10300_dcache_flush_inv_end:
+ ret [],0
+#endif /* CONFIG_MN10300_CACHE_WBACK */
+
+
+###############################################################################
+#
+# Data areas
+#
+###############################################################################
.data
.align 4
param_save_area:
next prev parent reply other threads:[~2010-10-26 2:55 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-26 2:53 [PATCH 00/43] MN10300: Add SMP support and AM34 CPU core support David Howells
2010-10-26 2:53 ` [PATCH 01/43] Partially revert patch that encloses asm-offset.h numbers in brackets David Howells
2010-10-26 2:53 ` [PATCH 02/43] MN10300: BUG to BUG_ON changes David Howells
2010-10-26 2:53 ` [PATCH 03/43] bitops: Change the bitmap index from int to unsigned long [mn10300] David Howells
2010-10-26 2:53 ` [PATCH 04/43] mn10300: Use pci_claim_resource David Howells
2010-10-26 2:53 ` [PATCH 05/43] MN10300: Prevent cnt32_to_63() from being preempted in sched_clock() David Howells
2010-10-26 2:53 ` [PATCH 06/43] Typedef SMP call function pointer David Howells
2010-10-26 2:53 ` [PATCH 07/43] MN10300: Don't cast away the volatile in test_bit() David Howells
2010-10-26 2:53 ` [PATCH 08/43] MN10300: Add reads[bwl]() and writes[bwl]() David Howells
2010-10-26 2:53 ` [PATCH 09/43] MN10300: Provide the functions to fully disable maskable interrupts David Howells
2010-10-26 2:53 ` [PATCH 10/43] MN10300: Differentiate AM33_2 and AM33_3 in config David Howells
2010-10-26 2:54 ` [PATCH 11/43] MN10300: Move DMA engine control reg defs to MN103E010 processor directory David Howells
2010-10-26 2:54 ` [PATCH 12/43] MN10300: Don't hard code the cacheline size in register defs David Howells
2010-10-26 2:54 ` [PATCH 13/43] MN10300: Add CPU register bits for AM34 David Howells
2010-10-26 2:54 ` [PATCH 14/43] MN10300: Remove monitor/JTAG functions David Howells
2010-10-26 2:54 ` [PATCH 15/43] MN10300: Cache: Split cache bits out of arch Kconfig David Howells
2010-10-26 2:54 ` [PATCH 16/43] MN10300: Provide a MN10300_CACHE_ENABLED config option David Howells
2010-10-26 2:54 ` [PATCH 17/43] MN10300: Reorder asm/cacheflush.h to put primitives first David Howells
2010-10-26 2:54 ` [PATCH 18/43] MN10300: AM34: The current cacheflush routines operate by controlling tag regs David Howells
2010-10-26 2:54 ` [PATCH 19/43] MN10300: Cacheflush functions should take unsigned long addresses David Howells
2010-10-26 2:54 ` [PATCH 20/43] MN10300: SMP: Differentiate local cache flushing David Howells
2010-10-26 2:54 ` [PATCH 21/43] MN10300: AM34: Add cacheflushing by using the AM34 purge registers David Howells
2010-10-26 2:54 ` [PATCH 22/43] MN10300: Allow some cacheflushes to be avoided if cache snooping is available David Howells
2010-10-26 2:55 ` [PATCH 23/43] MN10300: Cache: Implement SMP global cache flushing David Howells
2010-10-26 2:55 ` David Howells [this message]
2010-10-26 2:55 ` [PATCH 25/43] MN10300: AM34 erratum requires MMUCTR read and write on exception entry David Howells
2010-10-26 2:55 ` [PATCH 26/43] MN10300: Rename __flush_tlb*() to local_flush_tlb*() David Howells
2010-10-26 2:55 ` [PATCH 27/43] MN10300: Make the use of PIDR to mark TLB entries controllable David Howells
2010-10-26 2:55 ` [PATCH 28/43] MN10300: Use the [ID]PTEL2 registers rather than [ID]PTEL for TLB control David Howells
2010-10-26 2:55 ` [PATCH 29/43] MN10300: SMP TLB flushing David Howells
2010-10-26 2:55 ` [PATCH 30/43] MN10300: Make the FPU operate in non-lazy mode under SMP David Howells
2010-10-26 2:55 ` [PATCH 31/43] MN10300: Implement atomic ops using atomic ops unit David Howells
2010-10-26 2:55 ` [PATCH 32/43] MN10300: Optimise do_csum() David Howells
2010-10-26 2:55 ` [PATCH 33/43] MN10300: Make various interrupt priority settings configurable David Howells
2010-10-26 2:56 ` [PATCH 34/43] MN10300: Delete idle_timestamp from irq_cpustat_t David Howells
2010-10-26 2:56 ` [PATCH 35/43] MN10300: And Panasonic AM34 subarch and implement SMP David Howells
2010-10-27 13:31 ` [Linux-am33-list] " Suzuki Takashi
2010-10-27 14:33 ` David Howells
2010-10-26 2:56 ` [PATCH 36/43] MN10300: ASB2364: Add support for SMSC911X and SMC911X David Howells
2010-10-26 2:56 ` [PATCH 37/43] MN10300: Map userspace atomic op regs as a vmalloc page David Howells
2010-10-26 2:56 ` [PATCH 38/43] MN10300: Specify an ELF HWCAP flag for MN10300 Atomic Operations Unit support David Howells
2010-10-26 2:56 ` [PATCH 39/43] MN10300: Generic time support David Howells
2010-10-26 2:56 ` [PATCH 40/43] MN10300: Update the ASB2303 defconfig David Howells
2010-10-26 2:56 ` [PATCH 41/43] MN10300: Create a defconfig for the ASB2364 board David Howells
2010-10-26 2:56 ` [PATCH 42/43] MN10300: Change "Matsushita" to "Panasonic" David Howells
2010-10-26 2:56 ` [PATCH 43/43] MN10300: Save frame pointer in thread_info struct rather than global var David Howells
2010-10-26 3:07 ` [PATCH 00/43] MN10300: Add SMP support and AM34 CPU core support David Howells
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