powerpc: Remove 64-bit cpu support from ppc32.

These days there is no good reason to run a ppc32 kernel on a 64-bit
cpu, rather than a ppc64 kernel, so remove the config option and a
bunch of code (and ifdefs) from head.S.

Signed-off-by: Paul Mackerras <paulus@samba.org>

2 files changed, 11 insertions, 153 deletions

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 34be3247fca4..330376b74c87 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -109,10 +109,6 @@ config 40x
 config 44x
         bool "AMCC 44x"
 
-config PPC64BRIDGE
-        select PPC_FPU
-        bool "POWER3, POWER4 and PPC970 (G5)"
-
 config 8xx
         bool "Freescale 8xx"
 
@@ -125,7 +121,7 @@ endchoice
 
 config POWER4_ONLY
         bool "Optimize for POWER4"
-        depends on PPC64 || PPC64BRIDGE
+        depends on PPC64
         default n
         ---help---
           Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
@@ -134,16 +130,16 @@ config POWER4_ONLY
 
 config POWER3
         bool
-        depends on PPC64 || PPC64BRIDGE
+        depends on PPC64
         default y if !POWER4_ONLY
 
 config POWER4
-        depends on PPC64 || PPC64BRIDGE
+        depends on PPC64
         def_bool y
 
 config PPC_FPU
-        depends on PPC32
-        def_bool y
+        bool
+        default y if PPC64
 
 config BOOKE
         bool
@@ -317,7 +313,7 @@ config PPC_BPA
 
 config PPC_OF
         bool
-        depends on PPC_MULTIPLATFORM || PPC_ISERIES
+        depends on PPC_MULTIPLATFORM    # for now
         default y
 
 config XICS
diff --git a/arch/powerpc/kernel/head.S b/arch/powerpc/kernel/head.S
index d49bff1a7d51..276793e05fd0 100644
--- a/arch/powerpc/kernel/head.S
+++ b/arch/powerpc/kernel/head.S
@@ -37,19 +37,6 @@
 #include <asm/amigappc.h>
 #endif
 
-#ifdef CONFIG_PPC64BRIDGE
-#define LOAD_BAT(n, reg, RA, RB)        \
-        ld      RA,(n*32)+0(reg);       \
-        ld      RB,(n*32)+8(reg);       \
-        mtspr   SPRN_IBAT##n##U,RA;     \
-        mtspr   SPRN_IBAT##n##L,RB;     \
-        ld      RA,(n*32)+16(reg);      \
-        ld      RB,(n*32)+24(reg);      \
-        mtspr   SPRN_DBAT##n##U,RA;     \
-        mtspr   SPRN_DBAT##n##L,RB;     \
-
-#else /* CONFIG_PPC64BRIDGE */
-
 /* 601 only have IBAT; cr0.eq is set on 601 when using this macro */
 #define LOAD_BAT(n, reg, RA, RB)        \
         /* see the comment for clear_bats() -- Cort */ \
@@ -66,7 +53,6 @@
         mtspr   SPRN_DBAT##n##U,RA;     \
         mtspr   SPRN_DBAT##n##L,RB;     \
 1:
-#endif /* CONFIG_PPC64BRIDGE */
 
         .text
         .stabs  "arch/ppc/kernel/",N_SO,0,0,0f
@@ -150,14 +136,6 @@ __start:
  */
         bl      early_init
 
-/*
- * On POWER4, we first need to tweak some CPU configuration registers
- * like real mode cache inhibit or exception base
- */
-#ifdef CONFIG_POWER4
-        bl      __970_cpu_preinit
-#endif /* CONFIG_POWER4 */
-
 #ifdef CONFIG_APUS
 /* On APUS the __va/__pa constants need to be set to the correct
  * values before continuing.
@@ -171,7 +149,6 @@ __start:
  */
         bl      mmu_off
 __after_mmu_off:
-#ifndef CONFIG_POWER4
         bl      clear_bats
         bl      flush_tlbs
 
@@ -179,10 +156,6 @@ __after_mmu_off:
 #if !defined(CONFIG_APUS) && defined(CONFIG_BOOTX_TEXT)
         bl      setup_disp_bat
 #endif
-#else /* CONFIG_POWER4 */
-        bl      reloc_offset
-        bl      initial_mm_power4
-#endif /* CONFIG_POWER4 */
 
 /*
  * Call setup_cpu for CPU 0 and initialize 6xx Idle
@@ -194,10 +167,6 @@ __after_mmu_off:
         bl      reloc_offset
         bl      init_idle_6xx
 #endif /* CONFIG_6xx */
-#ifdef CONFIG_POWER4
-        bl      reloc_offset
-        bl      init_idle_power4
-#endif /* CONFIG_POWER4 */
 
 
 #ifndef CONFIG_APUS
@@ -397,13 +366,8 @@ i##n:								\
 
 /* Data access exception. */
         . = 0x300
-#ifdef CONFIG_PPC64BRIDGE
-        b       DataAccess
-DataAccessCont:
-#else
 DataAccess:
         EXCEPTION_PROLOG
-#endif /* CONFIG_PPC64BRIDGE */
         mfspr   r10,SPRN_DSISR
         andis.  r0,r10,0xa470           /* weird error? */
         bne     1f                      /* if not, try to put a PTE */
@@ -415,21 +379,11 @@ DataAccess:
         mfspr   r4,SPRN_DAR
         EXC_XFER_EE_LITE(0x300, handle_page_fault)
 
-#ifdef CONFIG_PPC64BRIDGE
-/* SLB fault on data access. */
-        . = 0x380
-        b       DataSegment
-#endif /* CONFIG_PPC64BRIDGE */
 
 /* Instruction access exception. */
         . = 0x400
-#ifdef CONFIG_PPC64BRIDGE
-        b       InstructionAccess
-InstructionAccessCont:
-#else
 InstructionAccess:
         EXCEPTION_PROLOG
-#endif /* CONFIG_PPC64BRIDGE */
         andis.  r0,r9,0x4000            /* no pte found? */
         beq     1f                      /* if so, try to put a PTE */
         li      r3,0                    /* into the hash table */
@@ -439,12 +393,6 @@ InstructionAccess:
         mr      r5,r9
         EXC_XFER_EE_LITE(0x400, handle_page_fault)
 
-#ifdef CONFIG_PPC64BRIDGE
-/* SLB fault on instruction access. */
-        . = 0x480
-        b       InstructionSegment
-#endif /* CONFIG_PPC64BRIDGE */
-
 /* External interrupt */
         EXCEPTION(0x500, HardwareInterrupt, do_IRQ, EXC_XFER_LITE)
 
@@ -709,15 +657,9 @@ DataStoreTLBMiss:
         EXCEPTION(0x1300, Trap_13, instruction_breakpoint_exception, EXC_XFER_EE)
         EXCEPTION(0x1400, SMI, SMIException, EXC_XFER_EE)
         EXCEPTION(0x1500, Trap_15, unknown_exception, EXC_XFER_EE)
-#ifdef CONFIG_POWER4
-        EXCEPTION(0x1600, Trap_16, unknown_exception, EXC_XFER_EE)
-        EXCEPTION(0x1700, Trap_17, altivec_assist_exception, EXC_XFER_EE)
-        EXCEPTION(0x1800, Trap_18, TAUException, EXC_XFER_STD)
-#else /* !CONFIG_POWER4 */
         EXCEPTION(0x1600, Trap_16, altivec_assist_exception, EXC_XFER_EE)
         EXCEPTION(0x1700, Trap_17, TAUException, EXC_XFER_STD)
         EXCEPTION(0x1800, Trap_18, unknown_exception, EXC_XFER_EE)
-#endif /* CONFIG_POWER4 */
         EXCEPTION(0x1900, Trap_19, unknown_exception, EXC_XFER_EE)
         EXCEPTION(0x1a00, Trap_1a, unknown_exception, EXC_XFER_EE)
         EXCEPTION(0x1b00, Trap_1b, unknown_exception, EXC_XFER_EE)
@@ -754,28 +696,6 @@ AltiVecUnavailable:
 #endif /* CONFIG_ALTIVEC */
         EXC_XFER_EE_LITE(0xf20, altivec_unavailable_exception)
 
-#ifdef CONFIG_PPC64BRIDGE
-DataAccess:
-        EXCEPTION_PROLOG
-        b       DataAccessCont
-
-InstructionAccess:
-        EXCEPTION_PROLOG
-        b       InstructionAccessCont
-
-DataSegment:
-        EXCEPTION_PROLOG
-        addi    r3,r1,STACK_FRAME_OVERHEAD
-        mfspr   r4,SPRN_DAR
-        stw     r4,_DAR(r11)
-        EXC_XFER_STD(0x380, unknown_exception)
-
-InstructionSegment:
-        EXCEPTION_PROLOG
-        addi    r3,r1,STACK_FRAME_OVERHEAD
-        EXC_XFER_STD(0x480, unknown_exception)
-#endif /* CONFIG_PPC64BRIDGE */
-
 #ifdef CONFIG_ALTIVEC
 /* Note that the AltiVec support is closely modeled after the FP
  * support.  Changes to one are likely to be applicable to the
@@ -1048,13 +968,6 @@ __secondary_start_pmac_0:
 
         .globl  __secondary_start
 __secondary_start:
-#ifdef CONFIG_PPC64BRIDGE
-        mfmsr   r0
-        clrldi  r0,r0,1                 /* make sure it's in 32-bit mode */
-        SYNC
-        MTMSRD(r0)
-        isync
-#endif
         /* Copy some CPU settings from CPU 0 */
         bl      __restore_cpu_setup
 
@@ -1065,10 +978,6 @@ __secondary_start:
         lis     r3,-KERNELBASE@h
         bl      init_idle_6xx
 #endif /* CONFIG_6xx */
-#ifdef CONFIG_POWER4
-        lis     r3,-KERNELBASE@h
-        bl      init_idle_power4
-#endif /* CONFIG_POWER4 */
 
         /* get current_thread_info and current */
         lis     r1,secondary_ti@ha
@@ -1109,12 +1018,12 @@ __secondary_start:
  * Those generic dummy functions are kept for CPUs not
  * included in CONFIG_6xx
  */
-#if !defined(CONFIG_6xx) && !defined(CONFIG_POWER4)
+#if !defined(CONFIG_6xx)
 _GLOBAL(__save_cpu_setup)
         blr
 _GLOBAL(__restore_cpu_setup)
         blr
-#endif /* !defined(CONFIG_6xx) && !defined(CONFIG_POWER4) */
+#endif /* !defined(CONFIG_6xx) */
 
 
 /*
@@ -1132,11 +1041,6 @@ load_up_mmu:
         tophys(r6,r6)
         lwz     r6,_SDR1@l(r6)
         mtspr   SPRN_SDR1,r6
-#ifdef CONFIG_PPC64BRIDGE
-        /* clear the ASR so we only use the pseudo-segment registers. */
-        li      r6,0
-        mtasr   r6
-#endif /* CONFIG_PPC64BRIDGE */
         li      r0,16           /* load up segment register values */
         mtctr   r0              /* for context 0 */
         lis     r3,0x2000       /* Ku = 1, VSID = 0 */
@@ -1145,7 +1049,7 @@ load_up_mmu:
         addi    r3,r3,0x111     /* increment VSID */
         addis   r4,r4,0x1000    /* address of next segment */
         bdnz    3b
-#ifndef CONFIG_POWER4
+
 /* Load the BAT registers with the values set up by MMU_init.
    MMU_init takes care of whether we're on a 601 or not. */
         mfpvr   r3
@@ -1158,7 +1062,7 @@ load_up_mmu:
         LOAD_BAT(1,r3,r4,r5)
         LOAD_BAT(2,r3,r4,r5)
         LOAD_BAT(3,r3,r4,r5)
-#endif /* CONFIG_POWER4 */
+
         blr
 
 /*
@@ -1183,7 +1087,7 @@ start_here:
         li      r0,0
         stwu    r0,THREAD_SIZE-STACK_FRAME_OVERHEAD(r1)
 /*
- * Do early bootinfo parsing, platform-specific initialization,
+ * Do early platform-specific initialization,
  * and set up the MMU.
  */
         mr      r3,r31
@@ -1266,9 +1170,6 @@ _GLOBAL(set_context)
         li      r4,0
         isync
 3:
-#ifdef CONFIG_PPC64BRIDGE
-        slbie   r4
-#endif /* CONFIG_PPC64BRIDGE */
         mtsrin  r3,r4
         addi    r3,r3,0x111     /* next VSID */
         rlwinm  r3,r3,0,8,3     /* clear out any overflow from VSID field */
@@ -1355,7 +1256,6 @@ mmu_off:
         sync
         RFI
 
-#ifndef CONFIG_POWER4
 /*
  * Use the first pair of BAT registers to map the 1st 16MB
  * of RAM to KERNELBASE.  From this point on we can't safely
@@ -1363,7 +1263,6 @@ mmu_off:
  */
 initial_bats:
         lis     r11,KERNELBASE@h
-#ifndef CONFIG_PPC64BRIDGE
         mfspr   r9,SPRN_PVR
         rlwinm  r9,r9,16,16,31          /* r9 = 1 for 601, 4 for 604 */
         cmpwi   0,r9,1
@@ -1378,7 +1277,6 @@ initial_bats:
         mtspr   SPRN_IBAT1L,r10
         isync
         blr
-#endif /* CONFIG_PPC64BRIDGE */
 
 4:      tophys(r8,r11)
 #ifdef CONFIG_SMP
@@ -1392,11 +1290,6 @@ initial_bats:
         ori     r11,r11,BL_256M<<2|0x2  /* set up BAT registers for 604 */
 #endif /* CONFIG_APUS */
 
-#ifdef CONFIG_PPC64BRIDGE
-        /* clear out the high 32 bits in the BAT */
-        clrldi  r11,r11,32
-        clrldi  r8,r8,32
-#endif /* CONFIG_PPC64BRIDGE */
         mtspr   SPRN_DBAT0L,r8          /* N.B. 6xx (not 601) have valid */
         mtspr   SPRN_DBAT0U,r11         /* bit in upper BAT register */
         mtspr   SPRN_IBAT0L,r8
@@ -1429,37 +1322,6 @@ setup_disp_bat:
 
 #endif /* !defined(CONFIG_APUS) && defined(CONFIG_BOOTX_TEXT) */
 
-#else /* CONFIG_POWER4 */
-/*
- * Load up the SDR1 and segment register values now
- * since we don't have the BATs.
- * Also make sure we are running in 32-bit mode.
- */
-
-initial_mm_power4:
-        addis   r14,r3,_SDR1@ha         /* get the value from _SDR1 */
-        lwz     r14,_SDR1@l(r14)        /* assume hash table below 4GB */
-        mtspr   SPRN_SDR1,r14
-        slbia
-        lis     r4,0x2000               /* set pseudo-segment reg 12 */
-        ori     r5,r4,0x0ccc
-        mtsr    12,r5
-#if 0
-        ori     r5,r4,0x0888            /* set pseudo-segment reg 8 */
-        mtsr    8,r5                    /* (for access to serial port) */
-#endif
-#ifdef CONFIG_BOOTX_TEXT
-        ori     r5,r4,0x0999            /* set pseudo-segment reg 9 */
-        mtsr    9,r5                    /* (for access to screen) */
-#endif
-        mfmsr   r0
-        clrldi  r0,r0,1
-        sync
-        mtmsr   r0
-        isync
-        blr
-
-#endif /* CONFIG_POWER4 */
 
 #ifdef CONFIG_8260
 /* Jump into the system reset for the rom.