Support for very old Cell hardware

We still have a small number of boards using the first
CPU generation and we want to keep running them for
a short time.

Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>

---

 arch/ppc64/Kconfig       |    6 ++++++
 arch/ppc64/kernel/head.S |    1 +
 include/asm-ppc64/mmu.h  |   16 ++++++++++++++++
 3 files changed, 23 insertions(+)

Index: linux-cg/arch/ppc64/Kconfig
===================================================================
--- linux-cg.orig/arch/ppc64/Kconfig
+++ linux-cg/arch/ppc64/Kconfig
@@ -227,6 +227,12 @@ config BE_DD2
 	---help---
 	This support enables BE DD2.x errata workarounds.
 
+config BE_DD1
+	bool "BE DD1.x Errata Workaround Support"
+	depends on PPC_BPA
+	---help---
+	This support enables BE DD1.x errata workarounds.
+
 config NR_CPUS
 	int "Maximum number of CPUs (2-128)"
 	range 2 128
Index: linux-cg/arch/ppc64/kernel/head.S
===================================================================
--- linux-cg.orig/arch/ppc64/kernel/head.S
+++ linux-cg/arch/ppc64/kernel/head.S
@@ -201,6 +201,7 @@ exception_marker:
 #define EX_CCR		60
 
 #define EXCEPTION_PROLOG_PSERIES(area, label)				\
+ 	HMT_MEDIUM;			/* FIXME: simulator/DD1 hack  */ \
 	mfspr	r13,SPRG3;		/* get paca address into r13 */	\
 	std	r9,area+EX_R9(r13);	/* save r9 - r12 */		\
 	std	r10,area+EX_R10(r13);					\
Index: linux-cg/include/asm-ppc64/mmu.h
===================================================================
--- linux-cg.orig/include/asm-ppc64/mmu.h
+++ linux-cg/include/asm-ppc64/mmu.h
@@ -130,9 +130,17 @@ static inline void __tlbie(unsigned long
 
 static inline void tlbie(unsigned long va, int large)
 {
+#ifdef CONFIG_BE_DD1
+	asm volatile("sync": : :"memory");
+#else
 	asm volatile("ptesync": : :"memory");
+#endif
 	__tlbie(va, large);
+#ifdef CONFIG_BE_DD1
+	asm volatile("eieio; tlbsync; sync": : :"memory");
+#else
 	asm volatile("eieio; tlbsync; ptesync": : :"memory");
+#endif
 }
 
 static inline void __tlbiel(unsigned long va)
@@ -156,9 +164,17 @@ static inline void __tlbiel(unsigned lon
 
 static inline void tlbiel(unsigned long va)
 {
+#ifdef CONFIG_BE_DD1
+	asm volatile("sync": : :"memory");
+#else
 	asm volatile("ptesync": : :"memory");
+#endif
 	__tlbiel(va);
+#ifdef CONFIG_BE_DD1
+	asm volatile("sync": : :"memory");
+#else
 	asm volatile("ptesync": : :"memory");
+#endif
 }
 
 static inline unsigned long slot2va(unsigned long hpte_v, unsigned long slot)

--