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authorJack Miller <jack@codezen.org>2011-04-14 22:32:08 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-05-06 13:32:41 +1000
commita0496d450ab8c17f6c4d86979b1f6ba486fe9365 (patch)
treeaccb4fa5d2695770a1c6992f7437df57e9f14868 /arch/powerpc/kernel/exceptions-64e.S
parenta1d0d98daf6ce580d017a43b09fe30a375cde3e8 (diff)
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powerpc: Add early debug for WSP platforms
Signed-off-by: Jack Miller <jack@codezen.org> Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64e.S')
-rw-r--r--arch/powerpc/kernel/exceptions-64e.S17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/exceptions-64e.S b/arch/powerpc/kernel/exceptions-64e.S
index c98e9d2..4d0abb4 100644
--- a/arch/powerpc/kernel/exceptions-64e.S
+++ b/arch/powerpc/kernel/exceptions-64e.S
@@ -17,6 +17,7 @@
#include <asm/cputable.h>
#include <asm/setup.h>
#include <asm/thread_info.h>
+#include <asm/reg_a2.h>
#include <asm/exception-64e.h>
#include <asm/bug.h>
#include <asm/irqflags.h>
@@ -951,6 +952,22 @@ a2_tlbinit_after_linear_map:
.globl a2_tlbinit_after_iprot_flush
a2_tlbinit_after_iprot_flush:
+#ifdef CONFIG_PPC_EARLY_DEBUG_WSP
+ /* Now establish early debug mappings if applicable */
+ /* Restore the MAS0 we used for linear mapping load */
+ mtspr SPRN_MAS0,r11
+
+ lis r3,(MAS1_VALID | MAS1_IPROT)@h
+ ori r3,r3,(BOOK3E_PAGESZ_4K << MAS1_TSIZE_SHIFT)
+ mtspr SPRN_MAS1,r3
+ LOAD_REG_IMMEDIATE(r3, WSP_UART_VIRT | MAS2_I | MAS2_G)
+ mtspr SPRN_MAS2,r3
+ LOAD_REG_IMMEDIATE(r3, WSP_UART_PHYS | MAS3_SR | MAS3_SW)
+ mtspr SPRN_MAS7_MAS3,r3
+ /* re-use the MAS8 value from the linear mapping */
+ tlbwe
+#endif /* CONFIG_PPC_EARLY_DEBUG_WSP */
+
PPC_TLBILX(0,0,0)
sync
isync