diff mbox series

[1/3] powerpc: Use feature bit for RTC presence rather than timebase presence

Message ID 1521495973-3237-2-git-send-email-paulus@ozlabs.org (mailing list archive)
State Accepted
Commit c0d64cf9fefd58831ce2cc81b2683bfff3760f7a
Headers show
Series powerpc: Free up CPU feature bits | expand

Commit Message

Paul Mackerras March 19, 2018, 9:46 p.m. UTC 
All PowerPC CPUs other than the original PPC601 have a timebase
register rather than the "real-time clock" (RTC) register that the
PPC601 (and the original POWER and POWER2 CPUs) had.  Currently
we have a CPU feature bit to indicate the presence of the timebase,
but it makes more sense to use a bit to indicate the unusual
situation rather than the common situation.  This therefore defines
a CPU_FTR_USE_RTC bit in place of the CPU_FTR_USE_TB bit, and
arranges for it to be set on PPC601 systems.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
---
 arch/powerpc/include/asm/cputable.h | 85 +++++++++++++++++--------------------
 arch/powerpc/include/asm/time.h     |  2 +-
 arch/powerpc/kernel/dt_cpu_ftrs.c   |  3 +-
 arch/powerpc/kernel/vdso.c          | 12 +++---
 4 files changed, 47 insertions(+), 55 deletions(-)

Comments

Michael Ellerman March 26, 2018, 8:56 a.m. UTC | #1 
On Mon, 2018-03-19 at 21:46:11 UTC, Paul Mackerras wrote:
> All PowerPC CPUs other than the original PPC601 have a timebase
> register rather than the "real-time clock" (RTC) register that the
> PPC601 (and the original POWER and POWER2 CPUs) had.  Currently
> we have a CPU feature bit to indicate the presence of the timebase,
> but it makes more sense to use a bit to indicate the unusual
> situation rather than the common situation.  This therefore defines
> a CPU_FTR_USE_RTC bit in place of the CPU_FTR_USE_TB bit, and
> arranges for it to be set on PPC601 systems.
> 
> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/c0d64cf9fefd58831ce2cc81b2683b

cheers
diff mbox series

Patch

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index a2c5c95..052db18 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -138,7 +138,7 @@  static inline void cpu_feature_keys_init(void) { }
 #define CPU_FTR_ALTIVEC			ASM_CONST(0x00000008)
 #define CPU_FTR_TAU			ASM_CONST(0x00000010)
 #define CPU_FTR_CAN_DOZE		ASM_CONST(0x00000020)
-#define CPU_FTR_USE_TB			ASM_CONST(0x00000040)
+#define CPU_FTR_USE_RTC			ASM_CONST(0x00000040)
 #define CPU_FTR_L2CSR			ASM_CONST(0x00000080)
 #define CPU_FTR_601			ASM_CONST(0x00000100)
 #define CPU_FTR_DBELL			ASM_CONST(0x00000200)
@@ -285,21 +285,19 @@  static inline void cpu_feature_keys_init(void) { }
 #endif
 
 #define CPU_FTRS_PPC601	(CPU_FTR_COMMON | CPU_FTR_601 | \
-	CPU_FTR_COHERENT_ICACHE | CPU_FTR_UNIFIED_ID_CACHE)
-#define CPU_FTRS_603	(CPU_FTR_COMMON | \
-	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | \
+	CPU_FTR_COHERENT_ICACHE | CPU_FTR_UNIFIED_ID_CACHE | CPU_FTR_USE_RTC)
+#define CPU_FTRS_603	(CPU_FTR_COMMON | CPU_FTR_MAYBE_CAN_DOZE | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_PPC_LE)
-#define CPU_FTRS_604	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | CPU_FTR_PPC_LE)
+#define CPU_FTRS_604	(CPU_FTR_COMMON | CPU_FTR_PPC_LE)
 #define CPU_FTRS_740_NOTAU	(CPU_FTR_COMMON | \
-	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | CPU_FTR_L2CR | \
+	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_L2CR | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_PPC_LE)
 #define CPU_FTRS_740	(CPU_FTR_COMMON | \
-	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | CPU_FTR_L2CR | \
+	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_L2CR | \
 	    CPU_FTR_TAU | CPU_FTR_MAYBE_CAN_NAP | \
 	    CPU_FTR_PPC_LE)
 #define CPU_FTRS_750	(CPU_FTR_COMMON | \
-	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | CPU_FTR_L2CR | \
+	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_L2CR | \
 	    CPU_FTR_TAU | CPU_FTR_MAYBE_CAN_NAP | \
 	    CPU_FTR_PPC_LE)
 #define CPU_FTRS_750CL	(CPU_FTRS_750)
@@ -308,103 +306,96 @@  static inline void cpu_feature_keys_init(void) { }
 #define CPU_FTRS_750FX	(CPU_FTRS_750 | CPU_FTR_DUAL_PLL_750FX)
 #define CPU_FTRS_750GX	(CPU_FTRS_750FX)
 #define CPU_FTRS_7400_NOTAU	(CPU_FTR_COMMON | \
-	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | CPU_FTR_L2CR | \
+	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_L2CR | \
 	    CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_PPC_LE)
 #define CPU_FTRS_7400	(CPU_FTR_COMMON | \
-	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | CPU_FTR_L2CR | \
+	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_L2CR | \
 	    CPU_FTR_TAU | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_PPC_LE)
 #define CPU_FTRS_7450_20	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | \
+	    CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_L3CR | CPU_FTR_SPEC7450 | \
 	    CPU_FTR_NEED_COHERENT | CPU_FTR_PPC_LE | CPU_FTR_NEED_PAIRED_STWCX)
 #define CPU_FTRS_7450_21	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_L3CR | CPU_FTR_SPEC7450 | \
 	    CPU_FTR_NAP_DISABLE_L2_PR | CPU_FTR_L3_DISABLE_NAP | \
 	    CPU_FTR_NEED_COHERENT | CPU_FTR_PPC_LE | CPU_FTR_NEED_PAIRED_STWCX)
 #define CPU_FTRS_7450_23	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | CPU_FTR_NEED_PAIRED_STWCX | \
+	    CPU_FTR_NEED_PAIRED_STWCX | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_L3CR | CPU_FTR_SPEC7450 | \
 	    CPU_FTR_NAP_DISABLE_L2_PR | CPU_FTR_NEED_COHERENT | CPU_FTR_PPC_LE)
 #define CPU_FTRS_7455_1	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | CPU_FTR_NEED_PAIRED_STWCX | \
+	    CPU_FTR_NEED_PAIRED_STWCX | \
 	    CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | CPU_FTR_L3CR | \
 	    CPU_FTR_SPEC7450 | CPU_FTR_NEED_COHERENT | CPU_FTR_PPC_LE)
 #define CPU_FTRS_7455_20	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | CPU_FTR_NEED_PAIRED_STWCX | \
+	    CPU_FTR_NEED_PAIRED_STWCX | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_L3CR | CPU_FTR_SPEC7450 | \
 	    CPU_FTR_NAP_DISABLE_L2_PR | CPU_FTR_L3_DISABLE_NAP | \
 	    CPU_FTR_NEED_COHERENT | CPU_FTR_PPC_LE)
 #define CPU_FTRS_7455	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_L3CR | CPU_FTR_SPEC7450 | CPU_FTR_NAP_DISABLE_L2_PR | \
 	    CPU_FTR_NEED_COHERENT | CPU_FTR_PPC_LE | CPU_FTR_NEED_PAIRED_STWCX)
 #define CPU_FTRS_7447_10	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_L3CR | CPU_FTR_SPEC7450 | CPU_FTR_NAP_DISABLE_L2_PR | \
 	    CPU_FTR_NEED_COHERENT | CPU_FTR_NO_BTIC | CPU_FTR_PPC_LE | \
 	    CPU_FTR_NEED_PAIRED_STWCX)
 #define CPU_FTRS_7447	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_L3CR | CPU_FTR_SPEC7450 | CPU_FTR_NAP_DISABLE_L2_PR | \
 	    CPU_FTR_NEED_COHERENT | CPU_FTR_PPC_LE | CPU_FTR_NEED_PAIRED_STWCX)
 #define CPU_FTRS_7447A	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_SPEC7450 | CPU_FTR_NAP_DISABLE_L2_PR | \
 	    CPU_FTR_NEED_COHERENT | CPU_FTR_PPC_LE | CPU_FTR_NEED_PAIRED_STWCX)
 #define CPU_FTRS_7448	(CPU_FTR_COMMON | \
-	    CPU_FTR_USE_TB | \
 	    CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_L2CR | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_SPEC7450 | CPU_FTR_NAP_DISABLE_L2_PR | \
 	    CPU_FTR_PPC_LE | CPU_FTR_NEED_PAIRED_STWCX)
-#define CPU_FTRS_82XX	(CPU_FTR_COMMON | \
-	    CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB)
+#define CPU_FTRS_82XX	(CPU_FTR_COMMON | CPU_FTR_MAYBE_CAN_DOZE)
 #define CPU_FTRS_G2_LE	(CPU_FTR_COMMON | CPU_FTR_MAYBE_CAN_DOZE | \
-	    CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP)
+	    CPU_FTR_MAYBE_CAN_NAP)
 #define CPU_FTRS_E300	(CPU_FTR_MAYBE_CAN_DOZE | \
-	    CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP | \
+	    CPU_FTR_MAYBE_CAN_NAP | \
 	    CPU_FTR_COMMON)
 #define CPU_FTRS_E300C2	(CPU_FTR_MAYBE_CAN_DOZE | \
-	    CPU_FTR_USE_TB | CPU_FTR_MAYBE_CAN_NAP | \
+	    CPU_FTR_MAYBE_CAN_NAP | \
 	    CPU_FTR_COMMON | CPU_FTR_FPU_UNAVAILABLE)
-#define CPU_FTRS_CLASSIC32	(CPU_FTR_COMMON | CPU_FTR_USE_TB)
-#define CPU_FTRS_8XX	(CPU_FTR_USE_TB | CPU_FTR_NOEXECUTE)
-#define CPU_FTRS_40X	(CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE)
-#define CPU_FTRS_44X	(CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE)
-#define CPU_FTRS_440x6	(CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE | \
+#define CPU_FTRS_CLASSIC32	(CPU_FTR_COMMON)
+#define CPU_FTRS_8XX	(CPU_FTR_NOEXECUTE)
+#define CPU_FTRS_40X	(CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE)
+#define CPU_FTRS_44X	(CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE)
+#define CPU_FTRS_440x6	(CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE | \
 	    CPU_FTR_INDEXED_DCR)
 #define CPU_FTRS_47X	(CPU_FTRS_440x6)
-#define CPU_FTRS_E200	(CPU_FTR_USE_TB | CPU_FTR_SPE_COMP | \
+#define CPU_FTRS_E200	(CPU_FTR_SPE_COMP | \
 	    CPU_FTR_NODSISRALIGN | CPU_FTR_COHERENT_ICACHE | \
 	    CPU_FTR_UNIFIED_ID_CACHE | CPU_FTR_NOEXECUTE | \
 	    CPU_FTR_DEBUG_LVL_EXC)
-#define CPU_FTRS_E500	(CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | \
+#define CPU_FTRS_E500	(CPU_FTR_MAYBE_CAN_DOZE | \
 	    CPU_FTR_SPE_COMP | CPU_FTR_MAYBE_CAN_NAP | CPU_FTR_NODSISRALIGN | \
 	    CPU_FTR_NOEXECUTE)
-#define CPU_FTRS_E500_2	(CPU_FTR_MAYBE_CAN_DOZE | CPU_FTR_USE_TB | \
+#define CPU_FTRS_E500_2	(CPU_FTR_MAYBE_CAN_DOZE | \
 	    CPU_FTR_SPE_COMP | CPU_FTR_MAYBE_CAN_NAP | \
 	    CPU_FTR_NODSISRALIGN | CPU_FTR_NOEXECUTE)
-#define CPU_FTRS_E500MC	(CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | \
+#define CPU_FTRS_E500MC	(CPU_FTR_NODSISRALIGN | \
 	    CPU_FTR_L2CSR | CPU_FTR_LWSYNC | CPU_FTR_NOEXECUTE | \
 	    CPU_FTR_DBELL | CPU_FTR_DEBUG_LVL_EXC | CPU_FTR_EMB_HV)
 /*
  * e5500/e6500 erratum A-006958 is a timebase bug that can use the
  * same workaround as CPU_FTR_CELL_TB_BUG.
  */
-#define CPU_FTRS_E5500	(CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | \
+#define CPU_FTRS_E5500	(CPU_FTR_NODSISRALIGN | \
 	    CPU_FTR_L2CSR | CPU_FTR_LWSYNC | CPU_FTR_NOEXECUTE | \
 	    CPU_FTR_DBELL | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \
 	    CPU_FTR_DEBUG_LVL_EXC | CPU_FTR_EMB_HV | CPU_FTR_CELL_TB_BUG)
-#define CPU_FTRS_E6500	(CPU_FTR_USE_TB | CPU_FTR_NODSISRALIGN | \
+#define CPU_FTRS_E6500	(CPU_FTR_NODSISRALIGN | \
 	    CPU_FTR_L2CSR | CPU_FTR_LWSYNC | CPU_FTR_NOEXECUTE | \
 	    CPU_FTR_DBELL | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \
 	    CPU_FTR_DEBUG_LVL_EXC | CPU_FTR_EMB_HV | CPU_FTR_ALTIVEC_COMP | \
@@ -412,21 +403,21 @@  static inline void cpu_feature_keys_init(void) { }
 #define CPU_FTRS_GENERIC_32	(CPU_FTR_COMMON | CPU_FTR_NODSISRALIGN)
 
 /* 64-bit CPUs */
-#define CPU_FTRS_POWER4	(CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
+#define CPU_FTRS_POWER4	(CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
 	    CPU_FTR_MMCRA | CPU_FTR_CP_USE_DCBTZ | \
 	    CPU_FTR_STCX_CHECKS_ADDRESS)
-#define CPU_FTRS_PPC970	(CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
+#define CPU_FTRS_PPC970	(CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | CPU_FTR_ARCH_201 | \
 	    CPU_FTR_ALTIVEC_COMP | CPU_FTR_CAN_NAP | CPU_FTR_MMCRA | \
 	    CPU_FTR_CP_USE_DCBTZ | CPU_FTR_STCX_CHECKS_ADDRESS | \
 	    CPU_FTR_HVMODE | CPU_FTR_DABRX)
-#define CPU_FTRS_POWER5	(CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
+#define CPU_FTRS_POWER5	(CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
 	    CPU_FTR_COHERENT_ICACHE | CPU_FTR_PURR | \
 	    CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_DABRX)
-#define CPU_FTRS_POWER6 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
+#define CPU_FTRS_POWER6 (CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
 	    CPU_FTR_COHERENT_ICACHE | \
@@ -434,7 +425,7 @@  static inline void cpu_feature_keys_init(void) { }
 	    CPU_FTR_DSCR | CPU_FTR_UNALIGNED_LD_STD | \
 	    CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_CFAR | \
 	    CPU_FTR_DABRX)
-#define CPU_FTRS_POWER7 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
+#define CPU_FTRS_POWER7 (CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | CPU_FTR_ARCH_206 |\
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
 	    CPU_FTR_COHERENT_ICACHE | \
@@ -443,7 +434,7 @@  static inline void cpu_feature_keys_init(void) { }
 	    CPU_FTR_STCX_CHECKS_ADDRESS | CPU_FTR_POPCNTB | CPU_FTR_POPCNTD | \
 	    CPU_FTR_CFAR | CPU_FTR_HVMODE | \
 	    CPU_FTR_VMX_COPY | CPU_FTR_HAS_PPR | CPU_FTR_DABRX | CPU_FTR_PKEY)
-#define CPU_FTRS_POWER8 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
+#define CPU_FTRS_POWER8 (CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | CPU_FTR_ARCH_206 |\
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
 	    CPU_FTR_COHERENT_ICACHE | \
@@ -455,7 +446,7 @@  static inline void cpu_feature_keys_init(void) { }
 	    CPU_FTR_ARCH_207S | CPU_FTR_TM_COMP | CPU_FTR_PKEY)
 #define CPU_FTRS_POWER8E (CPU_FTRS_POWER8 | CPU_FTR_PMAO_BUG)
 #define CPU_FTRS_POWER8_DD1 (CPU_FTRS_POWER8 & ~CPU_FTR_DBELL)
-#define CPU_FTRS_POWER9 (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
+#define CPU_FTRS_POWER9 (CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | CPU_FTR_ARCH_206 |\
 	    CPU_FTR_MMCRA | CPU_FTR_SMT | \
 	    CPU_FTR_COHERENT_ICACHE | \
@@ -470,15 +461,15 @@  static inline void cpu_feature_keys_init(void) { }
 			     (~CPU_FTR_SAO))
 #define CPU_FTRS_POWER9_DD2_0 CPU_FTRS_POWER9
 #define CPU_FTRS_POWER9_DD2_1 (CPU_FTRS_POWER9 | CPU_FTR_POWER9_DD2_1)
-#define CPU_FTRS_CELL	(CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
+#define CPU_FTRS_CELL	(CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_CTRL | \
 	    CPU_FTR_ALTIVEC_COMP | CPU_FTR_MMCRA | CPU_FTR_SMT | \
 	    CPU_FTR_PAUSE_ZERO  | CPU_FTR_CELL_TB_BUG | CPU_FTR_CP_USE_DCBTZ | \
 	    CPU_FTR_UNALIGNED_LD_STD | CPU_FTR_DABRX)
-#define CPU_FTRS_PA6T (CPU_FTR_USE_TB | CPU_FTR_LWSYNC | \
+#define CPU_FTRS_PA6T (CPU_FTR_LWSYNC | \
 	    CPU_FTR_PPCAS_ARCH_V2 | CPU_FTR_ALTIVEC_COMP | \
 	    CPU_FTR_PURR | CPU_FTR_REAL_LE | CPU_FTR_DABRX)
-#define CPU_FTRS_COMPATIBLE	(CPU_FTR_USE_TB | CPU_FTR_PPCAS_ARCH_V2)
+#define CPU_FTRS_COMPATIBLE	(CPU_FTR_PPCAS_ARCH_V2)
 
 #ifdef __powerpc64__
 #ifdef CONFIG_PPC_BOOK3E
diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
index 828ebe7..db546c0 100644
--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h
@@ -47,7 +47,7 @@  struct div_result {
 /* Accessor functions for the timebase (RTC on 601) registers. */
 /* If one day CONFIG_POWER is added just define __USE_RTC as 1 */
 #ifdef CONFIG_6xx
-#define __USE_RTC()	(!cpu_has_feature(CPU_FTR_USE_TB))
+#define __USE_RTC()	(cpu_has_feature(CPU_FTR_USE_RTC))
 #else
 #define __USE_RTC()	0
 #endif
diff --git a/arch/powerpc/kernel/dt_cpu_ftrs.c b/arch/powerpc/kernel/dt_cpu_ftrs.c
index 945e2c2..ee562ff 100644
--- a/arch/powerpc/kernel/dt_cpu_ftrs.c
+++ b/arch/powerpc/kernel/dt_cpu_ftrs.c
@@ -54,8 +54,7 @@  struct dt_cpu_feature {
 };
 
 #define CPU_FTRS_BASE \
-	   (CPU_FTR_USE_TB | \
-	    CPU_FTR_LWSYNC | \
+	   (CPU_FTR_LWSYNC | \
 	    CPU_FTR_FPU_UNAVAILABLE |\
 	    CPU_FTR_NODSISRALIGN |\
 	    CPU_FTR_NOEXECUTE |\
diff --git a/arch/powerpc/kernel/vdso.c b/arch/powerpc/kernel/vdso.c
index 22b01a3..b44ec10 100644
--- a/arch/powerpc/kernel/vdso.c
+++ b/arch/powerpc/kernel/vdso.c
@@ -99,26 +99,28 @@  static struct vdso_patch_def vdso_patches[] = {
 		CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
 		"__kernel_sync_dicache", "__kernel_sync_dicache_p5"
 	},
+#ifdef CONFIG_PPC32
 	{
-		CPU_FTR_USE_TB, 0,
+		CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 		"__kernel_gettimeofday", NULL
 	},
 	{
-		CPU_FTR_USE_TB, 0,
+		CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 		"__kernel_clock_gettime", NULL
 	},
 	{
-		CPU_FTR_USE_TB, 0,
+		CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 		"__kernel_clock_getres", NULL
 	},
 	{
-		CPU_FTR_USE_TB, 0,
+		CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 		"__kernel_get_tbfreq", NULL
 	},
 	{
-		CPU_FTR_USE_TB, 0,
+		CPU_FTR_USE_RTC, CPU_FTR_USE_RTC,
 		"__kernel_time", NULL
 	},
+#endif
 };
 
 /*