diff options
Diffstat (limited to 'cpu')
| -rw-r--r-- | cpu/mpc83xx/start.S | 477 |
1 files changed, 298 insertions, 179 deletions
diff --git a/cpu/mpc83xx/start.S b/cpu/mpc83xx/start.S index 0e1a5fd..46c748f 100644 --- a/cpu/mpc83xx/start.S +++ b/cpu/mpc83xx/start.S @@ -179,10 +179,47 @@ in_flash: #endif #endif /* CFG_RAMBOOT */ - bl setup_stack_in_data_cache_on_r1 + /* setup the bats */ + bl setup_bats + sync + + /* + * Cache must be enabled here for stack-in-cache trick. + * This means we need to enable the BATS. + * This means: + * 1) for the EVB, original gt regs need to be mapped + * 2) need to have an IBAT for the 0xf region, + * we are running there! + * Cache should be turned on after BATs, since by default + * everything is write-through. + * The init-mem BAT can be reused after reloc. The old + * gt-regs BAT can be reused after board_init_f calls + * board_early_init_f (EVB only). + */ + /* enable address translation */ + bl enable_addr_trans + sync + + /* enable and invalidate the data cache */ + bl dcache_enable + sync +#ifdef CFG_INIT_RAM_LOCK + bl lock_ram_in_cache + sync +#endif + + /* set up the stack pointer in our newly created + * cache-ram (r1) */ + lis r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@h + ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@l + + li r0, 0 /* Make room for stack frame header and */ + stwu r0, -4(r1) /* clear final stack frame so that */ + stwu r0, -4(r1) /* stack backtraces terminate cleanly */ + /* let the C-code set up the rest */ - /* */ + /* */ /* Be careful to keep code relocatable & stack humble */ /*------------------------------------------------------*/ @@ -509,6 +546,221 @@ init_e300_core: /* time t 10 */ /*------------------------------*/ blr + .globl invalidate_bats +invalidate_bats: + /* invalidate BATs */ + mtspr IBAT0U, r0 + mtspr IBAT1U, r0 + mtspr IBAT2U, r0 + mtspr IBAT3U, r0 +#if (CFG_HID2 & HID2_HBE) + mtspr IBAT4U, r0 + mtspr IBAT5U, r0 + mtspr IBAT6U, r0 + mtspr IBAT7U, r0 +#endif + isync + mtspr DBAT0U, r0 + mtspr DBAT1U, r0 + mtspr DBAT2U, r0 + mtspr DBAT3U, r0 +#if (CFG_HID2 & HID2_HBE) + mtspr DBAT4U, r0 + mtspr DBAT5U, r0 + mtspr DBAT6U, r0 + mtspr DBAT7U, r0 +#endif + isync + sync + blr + + /* setup_bats - set them up to some initial state */ + .globl setup_bats +setup_bats: + addis r0, r0, 0x0000 + + /* IBAT 0 */ + addis r4, r0, CFG_IBAT0L@h + ori r4, r4, CFG_IBAT0L@l + addis r3, r0, CFG_IBAT0U@h + ori r3, r3, CFG_IBAT0U@l + mtspr IBAT0L, r4 + mtspr IBAT0U, r3 + isync + + /* DBAT 0 */ + addis r4, r0, CFG_DBAT0L@h + ori r4, r4, CFG_DBAT0L@l + addis r3, r0, CFG_DBAT0U@h + ori r3, r3, CFG_DBAT0U@l + mtspr DBAT0L, r4 + mtspr DBAT0U, r3 + isync + + /* IBAT 1 */ + addis r4, r0, CFG_IBAT1L@h + ori r4, r4, CFG_IBAT1L@l + addis r3, r0, CFG_IBAT1U@h + ori r3, r3, CFG_IBAT1U@l + mtspr IBAT1L, r4 + mtspr IBAT1U, r3 + isync + + /* DBAT 1 */ + addis r4, r0, CFG_DBAT1L@h + ori r4, r4, CFG_DBAT1L@l + addis r3, r0, CFG_DBAT1U@h + ori r3, r3, CFG_DBAT1U@l + mtspr DBAT1L, r4 + mtspr DBAT1U, r3 + isync + + /* IBAT 2 */ + addis r4, r0, CFG_IBAT2L@h + ori r4, r4, CFG_IBAT2L@l + addis r3, r0, CFG_IBAT2U@h + ori r3, r3, CFG_IBAT2U@l + mtspr IBAT2L, r4 + mtspr IBAT2U, r3 + isync + + /* DBAT 2 */ + addis r4, r0, CFG_DBAT2L@h + ori r4, r4, CFG_DBAT2L@l + addis r3, r0, CFG_DBAT2U@h + ori r3, r3, CFG_DBAT2U@l + mtspr DBAT2L, r4 + mtspr DBAT2U, r3 + isync + + /* IBAT 3 */ + addis r4, r0, CFG_IBAT3L@h + ori r4, r4, CFG_IBAT3L@l + addis r3, r0, CFG_IBAT3U@h + ori r3, r3, CFG_IBAT3U@l + mtspr IBAT3L, r4 + mtspr IBAT3U, r3 + isync + + /* DBAT 3 */ + addis r4, r0, CFG_DBAT3L@h + ori r4, r4, CFG_DBAT3L@l + addis r3, r0, CFG_DBAT3U@h + ori r3, r3, CFG_DBAT3U@l + mtspr DBAT3L, r4 + mtspr DBAT3U, r3 + isync + +#if (CFG_HID2 & HID2_HBE) + /* IBAT 4 */ + addis r4, r0, CFG_IBAT4L@h + ori r4, r4, CFG_IBAT4L@l + addis r3, r0, CFG_IBAT4U@h + ori r3, r3, CFG_IBAT4U@l + mtspr IBAT4L, r4 + mtspr IBAT4U, r3 + isync + + /* DBAT 4 */ + addis r4, r0, CFG_DBAT4L@h + ori r4, r4, CFG_DBAT4L@l + addis r3, r0, CFG_DBAT4U@h + ori r3, r3, CFG_DBAT4U@l + mtspr DBAT4L, r4 + mtspr DBAT4U, r3 + isync + + /* IBAT 5 */ + addis r4, r0, CFG_IBAT5L@h + ori r4, r4, CFG_IBAT5L@l + addis r3, r0, CFG_IBAT5U@h + ori r3, r3, CFG_IBAT5U@l + mtspr IBAT5L, r4 + mtspr IBAT5U, r3 + isync + + /* DBAT 5 */ + addis r4, r0, CFG_DBAT5L@h + ori r4, r4, CFG_DBAT5L@l + addis r3, r0, CFG_DBAT5U@h + ori r3, r3, CFG_DBAT5U@l + mtspr DBAT5L, r4 + mtspr DBAT5U, r3 + isync + + /* IBAT 6 */ + addis r4, r0, CFG_IBAT6L@h + ori r4, r4, CFG_IBAT6L@l + addis r3, r0, CFG_IBAT6U@h + ori r3, r3, CFG_IBAT6U@l + mtspr IBAT6L, r4 + mtspr IBAT6U, r3 + isync + + /* DBAT 6 */ + addis r4, r0, CFG_DBAT6L@h + ori r4, r4, CFG_DBAT6L@l + addis r3, r0, CFG_DBAT6U@h + ori r3, r3, CFG_DBAT6U@l + mtspr DBAT6L, r4 + mtspr DBAT6U, r3 + isync + + /* IBAT 7 */ + addis r4, r0, CFG_IBAT7L@h + ori r4, r4, CFG_IBAT7L@l + addis r3, r0, CFG_IBAT7U@h + ori r3, r3, CFG_IBAT7U@l + mtspr IBAT7L, r4 + mtspr IBAT7U, r3 + isync + + /* DBAT 7 */ + addis r4, r0, CFG_DBAT7L@h + ori r4, r4, CFG_DBAT7L@l + addis r3, r0, CFG_DBAT7U@h + ori r3, r3, CFG_DBAT7U@l + mtspr DBAT7L, r4 + mtspr DBAT7U, r3 + isync +#endif + + /* Invalidate TLBs. + * -> for (val = 0; val < 0x20000; val+=0x1000) + * -> tlbie(val); + */ + lis r3, 0 + lis r5, 2 + +1: + tlbie r3 + addi r3, r3, 0x1000 + cmp 0, 0, r3, r5 + blt 1b + + blr + + .globl enable_addr_trans +enable_addr_trans: + /* enable address translation */ + mfmsr r5 + ori r5, r5, (MSR_IR | MSR_DR) + mtmsr r5 + isync + blr + + .globl disable_addr_trans +disable_addr_trans: + /* disable address translation */ + mflr r4 + mfmsr r3 + andi. r0, r3, (MSR_IR | MSR_DR) + beqlr + andc r3, r3, r0 + mtspr SRR0, r4 + mtspr SRR1, r3 + rfi + /* Cache functions. * * Note: requires that all cache bits in @@ -550,26 +802,25 @@ icache_status: .globl dcache_enable dcache_enable: mfspr r3, HID0 - ori r3, r3, HID0_ENABLE_DATA_CACHE - lis r4, 0 - ori r4, r4, HID0_LOCK_DATA_CACHE - andc r3, r3, r4 - ori r4, r3, HID0_LOCK_INSTRUCTION_CACHE - sync - mtspr HID0, r4 /* sets enable and invalidate, clears lock */ + li r5, HID0_DCFI|HID0_DLOCK + andc r3, r3, r5 + mtspr HID0, r3 /* no invalidate, unlock */ + ori r3, r3, HID0_DCE + ori r5, r3, HID0_DCFI + mtspr HID0, r5 /* enable + invalidate */ + mtspr HID0, r3 /* enable */ sync - mtspr HID0, r3 /* clears invalidate */ blr .globl dcache_disable dcache_disable: mfspr r3, HID0 lis r4, 0 - ori r4, r4, HID0_ENABLE_DATA_CACHE|HID0_LOCK_DATA_CACHE + ori r4, r4, HID0_DCE|HID0_DLOCK andc r3, r3, r4 - ori r4, r3, HID0_INVALIDATE_DATA_CACHE + ori r4, r3, HID0_DCI sync - mtspr HID0, r4 /* sets invalidate, clears enable and lock */ + mtspr HID0, r4 /* sets invalidate, clears enable and lock */ sync mtspr HID0, r3 /* clears invalidate */ blr @@ -674,46 +925,29 @@ relocate_code: * Now flush the cache: note that we must start from a cache aligned * address. Otherwise we might miss one cache line. */ -4: - bl un_setup_stack_in_data_cache - mr r7, r3 - mr r8, r4 - bl dcache_disable - mr r3, r7 - mr r4, r8 - - cmpwi r6,0 +4: cmpwi r6,0 add r5,r3,r5 - beq 7f /* Always flush prefetch queue in any case */ + beq 7f /* Always flush prefetch queue in any case */ subi r0,r6,1 andc r3,r3,r0 - mfspr r7,HID0 /* don't do dcbst if dcache is disabled*/ - rlwinm r7,r7,HID0_DCE_SHIFT,31,31 - cmpwi r7,0 - beq 9f mr r4,r3 5: dcbst 0,r4 add r4,r4,r6 cmplw r4,r5 blt 5b - sync /* Wait for all dcbst to complete on bus */ -9: mfspr r7,HID0 /* don't do icbi if icache is disabled */ - rlwinm r7,r7,HID0_DCE_SHIFT,31,31 - cmpwi r7,0 - beq 7f + sync /* Wait for all dcbst to complete on bus */ mr r4,r3 6: icbi 0,r4 add r4,r4,r6 cmplw r4,r5 blt 6b -7: sync /* Wait for all icbi to complete on bus */ +7: sync /* Wait for all icbi to complete on bus */ isync /* * We are done. Do not return, instead branch to second part of board * initialization, now running from RAM. */ - addi r0, r10, in_ram - _start + EXC_OFF_SYS_RESET mtlr r0 blr @@ -871,6 +1105,27 @@ trap_reloc: blr #ifdef CFG_INIT_RAM_LOCK +lock_ram_in_cache: + /* Allocate Initial RAM in data cache. + */ + lis r3, (CFG_INIT_RAM_ADDR & ~31)@h + ori r3, r3, (CFG_INIT_RAM_ADDR & ~31)@l + li r2, ((CFG_INIT_RAM_END & ~31) + \ + (CFG_INIT_RAM_ADDR & 31) + 31) / 32 + mtctr r2 +1: + dcbz r0, r3 + addi r3, r3, 32 + bdnz 1b + + /* Lock the data cache */ + mfspr r0, HID0 + ori r0, r0, 0x1000 + sync + mtspr HID0, r0 + sync + blr + .globl unlock_ram_in_cache unlock_ram_in_cache: /* invalidate the INIT_RAM section */ @@ -884,6 +1139,15 @@ unlock_ram_in_cache: bdnz 1b sync /* Wait for all icbi to complete on bus */ isync + + /* Unlock the data cache and invalidate it */ + mfspr r3, HID0 + li r5, HID0_DLOCK|HID0_DCFI + andc r3, r3, r5 /* no invalidate, unlock */ + ori r5, r3, HID0_DCFI /* invalidate, unlock */ + mtspr HID0, r5 /* invalidate, unlock */ + mtspr HID0, r3 /* no invalidate, unlock */ + sync blr #endif @@ -952,148 +1216,3 @@ remap_flash_by_law0: stw r4, LBLAWBAR1(r3) stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */ blr - -setup_stack_in_data_cache_on_r1: - lis r3, (CFG_IMMRBAR)@h - - /* setup D-BAT for the D-Cache (with out real memory backup) */ - - lis r4, (CFG_INIT_RAM_ADDR & 0xFFFE0000)@h - mtspr DBAT0U, r4 - ori r4, r4, 0x0002 - mtspr DBAT0L, r4 - isync - -#if 0 - /* Enable MMU */ - mfmsr r4 - ori r4, r4, (MSR_DR | MSR_IR)@l - mtmsr r4 -#endif - - /* Enable and invalidate data cache. */ - mfspr r4, HID0 - mr r5, r4 - ori r4, r4, HID0_DCE | HID0_DCI - ori r5, r5, HID0_DCE - sync - mtspr HID0, r4 - mtspr HID0, r5 - sync - - /* Allocate Initial RAM in data cache.*/ - li r0, 0 - lis r4, (CFG_INIT_RAM_ADDR)@h - ori r4, r4, (CFG_INIT_RAM_ADDR)@l - li r5, 128*8 /* 128*8*32=32Kb */ - mtctr r5 -1: - dcbz r0, r4 - addi r4, r4, 32 - bdnz 1b - isync - - /* Lock all the D-cache, basically leaving the reset of the program without dcache */ - mfspr r4, HID0 - ori r4, r4, (HID0_DLOCK)@l - sync - mtspr HID0 , r4 - - /* setup the stack pointer in r1 */ - lis r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@h - ori r1, r1, (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET)@l - li r0, 0 /* Make room for stack frame header and */ - - stwu r0, -4(r1) /* clear final stack frame so that */ - stwu r0, -4(r1) /* stack backtraces terminate cleanly */ - - blr - -un_setup_stack_in_data_cache: - blr - mr r14, r4 - mr r15, r5 - - - lis r4, (CFG_INIT_RAM_ADDR & 0xFFFE0000)@h - mtspr DBAT0U, r4 - ori r4, r4, 0x0002 - mtspr DBAT0L, r4 - isync - - /* un lock all the D-cache */ - mfspr r4, HID0 - lis r5, (~(HID0_DLOCK))@h - ori r5, r5, (~(HID0_DLOCK))@l - and r4, r4, r5 - sync - mtspr HID0 , r4 - - /* Re - Allocate Initial RAM in data cache.*/ - li r0, 0 - lis r4, (CFG_INIT_RAM_ADDR)@h - ori r4, r4, (CFG_INIT_RAM_ADDR)@l - li r5, 128*8 /* 128*8*32=32Kb */ - mtctr r5 -1: - dcbz r0, r4 - addi r4, r4, 32 - bdnz 1b - isync - - mflr r16 - bl dcache_disable - mtlr r16 - - blr - -#if 0 -#define GREEN_LIGHT 0x2B0D4046 -#define RED_LIGHT 0x250D4046 -#define LIB_CNT 0x4FFF - -/* - * Lib Light - */ - - .globl liblight -liblight: - lis r3, CFG_IMMRBAR@h - ori r3, r3, CFG_IMMRBAR@l - li r4, 0x3002 - mtmsr r4 - xor r4, r4, r4 - mtspr HID0, r4 - mtspr HID2, r4 - lis r4, 0xF8000000@h - ori r4, r4, 0xF8000000@l - stw r4, LBLAWBAR1(r3) - lis r4, 0x8000000E@h - ori r4, r4, 0x8000000E@l - stw r4, LBLAWAR1(r3) - lis r4, 0xF8000801@h - ori r4, r4, 0xF8000801@l - stw r4, BR1(r3) - lis r4, 0xFFFFE8f0@h - ori r4, r4, 0xFFFFE8f0@l - stw r4, OR1(r3) - - lis r4, 0xF8000000@h - ori r4, r4, 0xF8000000@l - lis r5, GREEN_LIGHT@h - ori r5, r5, GREEN_LIGHT@l - lis r6, RED_LIGHT@h - ori r6, r6, RED_LIGHT@l - lis r7, LIB_CNT@h - ori r7, r7, LIB_CNT@l - -1: - stw r5, 0(r4) - mtctr r7 -2: bdnz 2b - stw r6, 0(r4) - mtctr r7 -3: bdnz 3b - b 1b - -#endif |