diff options
Diffstat (limited to 'arch/powerpc/cpu/mpc85xx/start.S')
| -rw-r--r-- | arch/powerpc/cpu/mpc85xx/start.S | 376 |
1 files changed, 332 insertions, 44 deletions
diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S index 6aabc30c2..9e04257d2 100644 --- a/arch/powerpc/cpu/mpc85xx/start.S +++ b/arch/powerpc/cpu/mpc85xx/start.S @@ -86,6 +86,35 @@ _start_e500: li r1,MSR_DE mtmsr r1 +#ifdef CONFIG_SYS_FSL_ERRATUM_A004510 + mfspr r3,SPRN_SVR + rlwinm r3,r3,0,0xff + li r4,CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV + cmpw r3,r4 + beq 1f + +#ifdef CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 + li r4,CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 + cmpw r3,r4 + beq 1f +#endif + + /* Not a supported revision affected by erratum */ + li r27,0 + b 2f + +1: li r27,1 /* Remember for later that we have the erratum */ + /* Erratum says set bits 55:60 to 001001 */ + msync + isync + mfspr r3,976 + li r4,0x48 + rlwimi r3,r4,0,0x1f8 + mtspr 976,r3 + isync +2: +#endif + #if defined(CONFIG_SECURE_BOOT) && defined(CONFIG_E500MC) /* ISBC uses L2 as stack. * Disable L2 cache here so that u-boot can enable it later @@ -406,12 +435,11 @@ l2_disabled: * Search for the TLB that covers the code we're executing, and shrink it * so that it covers only this 4K page. That will ensure that any other * TLB we create won't interfere with it. We assume that the TLB exists, - * which is why we don't check the Valid bit of MAS1. + * which is why we don't check the Valid bit of MAS1. We also assume + * it is in TLB1. * * This is necessary, for example, when booting from the on-chip ROM, * which (oddly) creates a single 4GB TLB that covers CCSR and DDR. - * If we don't shrink this TLB now, then we'll accidentally delete it - * in "purge_old_ccsr_tlb" below. */ bl nexti /* Find our address */ nexti: mflr r1 /* R1 = our PC */ @@ -421,11 +449,15 @@ nexti: mflr r1 /* R1 = our PC */ msync tlbsx 0, r1 /* This must succeed */ + mfspr r14, MAS0 /* Save ESEL for later */ + rlwinm r14, r14, 16, 0xfff + /* Set the size of the TLB to 4KB */ mfspr r3, MAS1 li r2, 0xF00 andc r3, r3, r2 /* Clear the TSIZE bits */ ori r3, r3, MAS1_TSIZE(BOOKE_PAGESZ_4K)@l + oris r3, r3, MAS1_IPROT@h mtspr MAS1, r3 /* @@ -440,6 +472,14 @@ nexti: mflr r1 /* R1 = our PC */ mfspr r2, MAS2 andc r2, r2, r3 or r2, r2, r1 +#ifdef CONFIG_SYS_FSL_ERRATUM_A004510 + cmpwi r27,0 + beq 1f + andi. r15, r2, MAS2_I|MAS2_G /* save the old I/G for later */ + rlwinm r2, r2, 0, ~MAS2_I + ori r2, r2, MAS2_G +1: +#endif mtspr MAS2, r2 /* Set the EPN to our PC base address */ mfspr r2, MAS3 @@ -452,6 +492,39 @@ nexti: mflr r1 /* R1 = our PC */ tlbwe /* + * Clear out any other TLB entries that may exist, to avoid conflicts. + * Our TLB entry is in r14. + */ + li r0, TLBIVAX_ALL | TLBIVAX_TLB0 + tlbivax 0, r0 + tlbsync + + mfspr r4, SPRN_TLB1CFG + rlwinm r4, r4, 0, TLBnCFG_NENTRY_MASK + + li r3, 0 + mtspr MAS1, r3 +1: cmpw r3, r14 +#if defined(CONFIG_SYS_PPC_E500_DEBUG_TLB) && !defined(CONFIG_NAND_SPL) + cmpwi cr1, r3, CONFIG_SYS_PPC_E500_DEBUG_TLB + cror cr0*4+eq, cr0*4+eq, cr1*4+eq +#endif + rlwinm r5, r3, 16, MAS0_ESEL_MSK + addi r3, r3, 1 + beq 2f /* skip the entry we're executing from */ + + oris r5, r5, MAS0_TLBSEL(1)@h + mtspr MAS0, r5 + + isync + tlbwe + isync + msync + +2: cmpw r3, r4 + blt 1b + +/* * Relocate CCSR, if necessary. We relocate CCSR if (obviously) the default * location is not where we want it. This typically happens on a 36-bit * system, where we want to move CCSR to near the top of 36-bit address space. @@ -469,41 +542,15 @@ nexti: mflr r1 /* R1 = our PC */ #error "CONFIG_SYS_CCSRBAR_PHYS_HIGH and CONFIG_SYS_CCSRBAR_PHYS_LOW) must be defined." #endif -purge_old_ccsr_tlb: - lis r8, CONFIG_SYS_CCSRBAR@h - ori r8, r8, CONFIG_SYS_CCSRBAR@l - lis r9, (CONFIG_SYS_CCSRBAR + 0x1000)@h - ori r9, r9, (CONFIG_SYS_CCSRBAR + 0x1000)@l - - /* - * In a multi-stage boot (e.g. NAND boot), a previous stage may have - * created a TLB for CCSR, which will interfere with our relocation - * code. Since we're going to create a new TLB for CCSR anyway, - * it should be safe to delete this old TLB here. We have to search - * for it, though. - */ - - li r1, 0 - mtspr MAS6, r1 /* Search the current address space and PID */ - isync - msync - tlbsx 0, r8 - mfspr r1, MAS1 - andis. r2, r1, MAS1_VALID@h /* Check for the Valid bit */ - beq 1f /* Skip if no TLB found */ - - rlwinm r1, r1, 0, 1, 31 /* Clear Valid bit */ - mtspr MAS1, r1 - isync - msync - tlbwe -1: - create_ccsr_new_tlb: /* * Create a TLB for the new location of CCSR. Register R8 is reserved * for the virtual address of this TLB (CONFIG_SYS_CCSRBAR). */ + lis r8, CONFIG_SYS_CCSRBAR@h + ori r8, r8, CONFIG_SYS_CCSRBAR@l + lis r9, (CONFIG_SYS_CCSRBAR + 0x1000)@h + ori r9, r9, (CONFIG_SYS_CCSRBAR + 0x1000)@l lis r0, FSL_BOOKE_MAS0(0, 0, 0)@h ori r0, r0, FSL_BOOKE_MAS0(0, 0, 0)@l lis r1, FSL_BOOKE_MAS1(1, 0, 0, 0, BOOKE_PAGESZ_4K)@h @@ -719,6 +766,253 @@ delete_temp_tlbs: tlbwe #endif /* #if (CONFIG_SYS_CCSRBAR_DEFAULT != CONFIG_SYS_CCSRBAR_PHYS) */ +#ifdef CONFIG_SYS_FSL_ERRATUM_A004510 +#define DCSR_LAWBARH0 (CONFIG_SYS_CCSRBAR + 0x1000) +#define LAW_SIZE_1M 0x13 +#define DCSRBAR_LAWAR (LAW_EN | (0x1d << 20) | LAW_SIZE_1M) + + cmpwi r27,0 + beq 9f + + /* + * Create a TLB entry for CCSR + * + * We're executing out of TLB1 entry in r14, and that's the only + * TLB entry that exists. To allocate some TLB entries for our + * own use, flip a bit high enough that we won't flip it again + * via incrementing. + */ + + xori r8, r14, 32 + lis r0, MAS0_TLBSEL(1)@h + rlwimi r0, r8, 16, MAS0_ESEL_MSK + lis r1, FSL_BOOKE_MAS1(1, 1, 0, 0, BOOKE_PAGESZ_16M)@h + ori r1, r1, FSL_BOOKE_MAS1(1, 1, 0, 0, BOOKE_PAGESZ_16M)@l + lis r7, CONFIG_SYS_CCSRBAR@h + ori r7, r7, CONFIG_SYS_CCSRBAR@l + ori r2, r7, MAS2_I|MAS2_G + lis r3, FSL_BOOKE_MAS3(CONFIG_SYS_CCSRBAR_PHYS_LOW, 0, (MAS3_SW|MAS3_SR))@h + ori r3, r3, FSL_BOOKE_MAS3(CONFIG_SYS_CCSRBAR_PHYS_LOW, 0, (MAS3_SW|MAS3_SR))@l + lis r4, CONFIG_SYS_CCSRBAR_PHYS_HIGH@h + ori r4, r4, CONFIG_SYS_CCSRBAR_PHYS_HIGH@l + mtspr MAS0, r0 + mtspr MAS1, r1 + mtspr MAS2, r2 + mtspr MAS3, r3 + mtspr MAS7, r4 + isync + tlbwe + isync + msync + + /* Map DCSR temporarily to physical address zero */ + li r0, 0 + lis r3, DCSRBAR_LAWAR@h + ori r3, r3, DCSRBAR_LAWAR@l + + stw r0, 0xc00(r7) /* LAWBARH0 */ + stw r0, 0xc04(r7) /* LAWBARL0 */ + sync + stw r3, 0xc08(r7) /* LAWAR0 */ + + /* Read back from LAWAR to ensure the update is complete. */ + lwz r3, 0xc08(r7) /* LAWAR0 */ + isync + + /* Create a TLB entry for DCSR at zero */ + + addi r9, r8, 1 + lis r0, MAS0_TLBSEL(1)@h + rlwimi r0, r9, 16, MAS0_ESEL_MSK + lis r1, FSL_BOOKE_MAS1(1, 1, 0, 0, BOOKE_PAGESZ_1M)@h + ori r1, r1, FSL_BOOKE_MAS1(1, 1, 0, 0, BOOKE_PAGESZ_1M)@l + li r6, 0 /* DCSR effective address */ + ori r2, r6, MAS2_I|MAS2_G + li r3, MAS3_SW|MAS3_SR + li r4, 0 + mtspr MAS0, r0 + mtspr MAS1, r1 + mtspr MAS2, r2 + mtspr MAS3, r3 + mtspr MAS7, r4 + isync + tlbwe + isync + msync + + /* enable the timebase */ +#define CTBENR 0xe2084 + li r3, 1 + addis r4, r7, CTBENR@ha + stw r3, CTBENR@l(r4) + lwz r3, CTBENR@l(r4) + twi 0,r3,0 + isync + + .macro erratum_set_ccsr offset value + addis r3, r7, \offset@ha + lis r4, \value@h + addi r3, r3, \offset@l + ori r4, r4, \value@l + bl erratum_set_value + .endm + + .macro erratum_set_dcsr offset value + addis r3, r6, \offset@ha + lis r4, \value@h + addi r3, r3, \offset@l + ori r4, r4, \value@l + bl erratum_set_value + .endm + + erratum_set_dcsr 0xb0e08 0xe0201800 + erratum_set_dcsr 0xb0e18 0xe0201800 + erratum_set_dcsr 0xb0e38 0xe0400000 + erratum_set_dcsr 0xb0008 0x00900000 + erratum_set_dcsr 0xb0e40 0xe00a0000 + erratum_set_ccsr 0x18600 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY + erratum_set_ccsr 0x10f00 0x415e5000 + erratum_set_ccsr 0x11f00 0x415e5000 + + /* Make temp mapping uncacheable again, if it was initially */ + bl 2f +2: mflr r3 + tlbsx 0, r3 + mfspr r4, MAS2 + rlwimi r4, r15, 0, MAS2_I + rlwimi r4, r15, 0, MAS2_G + mtspr MAS2, r4 + isync + tlbwe + isync + msync + + /* Clear the cache */ + lis r3,(L1CSR1_ICFI|L1CSR1_ICLFR)@h + ori r3,r3,(L1CSR1_ICFI|L1CSR1_ICLFR)@l + sync + isync + mtspr SPRN_L1CSR1,r3 + isync +2: sync + mfspr r4,SPRN_L1CSR1 + and. r4,r4,r3 + bne 2b + + lis r3,(L1CSR1_CPE|L1CSR1_ICE)@h + ori r3,r3,(L1CSR1_CPE|L1CSR1_ICE)@l + sync + isync + mtspr SPRN_L1CSR1,r3 + isync +2: sync + mfspr r4,SPRN_L1CSR1 + and. r4,r4,r3 + beq 2b + + /* Remove temporary mappings */ + lis r0, MAS0_TLBSEL(1)@h + rlwimi r0, r9, 16, MAS0_ESEL_MSK + li r3, 0 + mtspr MAS0, r0 + mtspr MAS1, r3 + isync + tlbwe + isync + msync + + li r3, 0 + stw r3, 0xc08(r7) /* LAWAR0 */ + lwz r3, 0xc08(r7) + isync + + lis r0, MAS0_TLBSEL(1)@h + rlwimi r0, r8, 16, MAS0_ESEL_MSK + li r3, 0 + mtspr MAS0, r0 + mtspr MAS1, r3 + isync + tlbwe + isync + msync + + b 9f + + /* r3 = addr, r4 = value, clobbers r5, r11, r12 */ +erratum_set_value: + /* Lock two cache lines into I-Cache */ + sync + mfspr r11, SPRN_L1CSR1 + rlwinm r11, r11, 0, ~L1CSR1_ICUL + sync + isync + mtspr SPRN_L1CSR1, r11 + isync + + mflr r12 + bl 5f +5: mflr r5 + addi r5, r5, 2f - 5b + icbtls 0, 0, r5 + addi r5, r5, 64 + + sync + mfspr r11, SPRN_L1CSR1 +3: andi. r11, r11, L1CSR1_ICUL + bne 3b + + icbtls 0, 0, r5 + addi r5, r5, 64 + + sync + mfspr r11, SPRN_L1CSR1 +3: andi. r11, r11, L1CSR1_ICUL + bne 3b + + b 2f + .align 6 + /* Inside a locked cacheline, wait a while, write, then wait a while */ +2: sync + + mfspr r5, SPRN_TBRL + addis r11, r5, 0x10000@h /* wait 65536 timebase ticks */ +4: mfspr r5, SPRN_TBRL + subf. r5, r5, r11 + bgt 4b + + stw r4, 0(r3) + + mfspr r5, SPRN_TBRL + addis r11, r5, 0x10000@h /* wait 65536 timebase ticks */ +4: mfspr r5, SPRN_TBRL + subf. r5, r5, r11 + bgt 4b + + sync + + /* + * Fill out the rest of this cache line and the next with nops, + * to ensure that nothing outside the locked area will be + * fetched due to a branch. + */ + .rept 19 + nop + .endr + + sync + mfspr r11, SPRN_L1CSR1 + rlwinm r11, r11, 0, ~L1CSR1_ICUL + sync + isync + mtspr SPRN_L1CSR1, r11 + isync + + mtlr r12 + blr + +9: +#endif + create_init_ram_area: lis r6,FSL_BOOKE_MAS0(1, 15, 0)@h ori r6,r6,FSL_BOOKE_MAS0(1, 15, 0)@l @@ -855,18 +1149,12 @@ version_string: .globl _start_cont _start_cont: /* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/ - lis r1,CONFIG_SYS_INIT_RAM_ADDR@h - ori r1,r1,CONFIG_SYS_INIT_SP_OFFSET@l - + lis r3,(CONFIG_SYS_INIT_RAM_ADDR)@h + ori r3,r3,((CONFIG_SYS_INIT_SP_OFFSET-16)&~0xf)@l /* Align to 16 */ li r0,0 - stwu r0,-4(r1) - stwu r0,-4(r1) /* Terminate call chain */ - - stwu r1,-8(r1) /* Save back chain and move SP */ - lis r0,RESET_VECTOR@h /* Address of reset vector */ - ori r0,r0,RESET_VECTOR@l - stwu r1,-8(r1) /* Save back chain and move SP */ - stw r0,+12(r1) /* Save return addr (underflow vect) */ + stw r0,0(r3) /* Terminate Back Chain */ + stw r0,+4(r3) /* NULL return address. */ + mr r1,r3 /* Transfer to SP(r1) */ GET_GOT bl cpu_init_early_f |