| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * This file contains low level CPU setup functions. |
| * Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org) |
| */ |
| |
| #include <linux/linkage.h> |
| |
| #include <asm/processor.h> |
| #include <asm/page.h> |
| #include <asm/cputable.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/cache.h> |
| #include <asm/mmu.h> |
| #include <asm/feature-fixups.h> |
| |
| _GLOBAL(__setup_cpu_603) |
| mflr r5 |
| BEGIN_MMU_FTR_SECTION |
| li r10,0 |
| mtspr SPRN_SPRG_603_LRU,r10 /* init SW LRU tracking */ |
| END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU) |
| |
| BEGIN_FTR_SECTION |
| bl __init_fpu_registers |
| END_FTR_SECTION_IFCLR(CPU_FTR_FPU_UNAVAILABLE) |
| bl setup_common_caches |
| mtlr r5 |
| blr |
| _GLOBAL(__setup_cpu_604) |
| mflr r5 |
| bl setup_common_caches |
| bl setup_604_hid0 |
| mtlr r5 |
| blr |
| _GLOBAL(__setup_cpu_750) |
| mflr r5 |
| bl __init_fpu_registers |
| bl setup_common_caches |
| bl setup_750_7400_hid0 |
| mtlr r5 |
| blr |
| _GLOBAL(__setup_cpu_750cx) |
| mflr r5 |
| bl __init_fpu_registers |
| bl setup_common_caches |
| bl setup_750_7400_hid0 |
| bl setup_750cx |
| mtlr r5 |
| blr |
| _GLOBAL(__setup_cpu_750fx) |
| mflr r5 |
| bl __init_fpu_registers |
| bl setup_common_caches |
| bl setup_750_7400_hid0 |
| bl setup_750fx |
| mtlr r5 |
| blr |
| _GLOBAL(__setup_cpu_7400) |
| mflr r5 |
| bl __init_fpu_registers |
| bl setup_7400_workarounds |
| bl setup_common_caches |
| bl setup_750_7400_hid0 |
| mtlr r5 |
| blr |
| _GLOBAL(__setup_cpu_7410) |
| mflr r5 |
| bl __init_fpu_registers |
| bl setup_7410_workarounds |
| bl setup_common_caches |
| bl setup_750_7400_hid0 |
| li r3,0 |
| mtspr SPRN_L2CR2,r3 |
| mtlr r5 |
| blr |
| _GLOBAL(__setup_cpu_745x) |
| mflr r5 |
| bl setup_common_caches |
| bl setup_745x_specifics |
| mtlr r5 |
| blr |
| |
| /* Enable caches for 603's, 604, 750 & 7400 */ |
| SYM_FUNC_START_LOCAL(setup_common_caches) |
| mfspr r11,SPRN_HID0 |
| andi. r0,r11,HID0_DCE |
| ori r11,r11,HID0_ICE|HID0_DCE |
| ori r8,r11,HID0_ICFI |
| bne 1f /* don't invalidate the D-cache */ |
| ori r8,r8,HID0_DCI /* unless it wasn't enabled */ |
| 1: sync |
| mtspr SPRN_HID0,r8 /* enable and invalidate caches */ |
| sync |
| mtspr SPRN_HID0,r11 /* enable caches */ |
| sync |
| isync |
| blr |
| SYM_FUNC_END(setup_common_caches) |
| |
| /* 604, 604e, 604ev, ... |
| * Enable superscalar execution & branch history table |
| */ |
| SYM_FUNC_START_LOCAL(setup_604_hid0) |
| mfspr r11,SPRN_HID0 |
| ori r11,r11,HID0_SIED|HID0_BHTE |
| ori r8,r11,HID0_BTCD |
| sync |
| mtspr SPRN_HID0,r8 /* flush branch target address cache */ |
| sync /* on 604e/604r */ |
| mtspr SPRN_HID0,r11 |
| sync |
| isync |
| blr |
| SYM_FUNC_END(setup_604_hid0) |
| |
| /* 7400 <= rev 2.7 and 7410 rev = 1.0 suffer from some |
| * erratas we work around here. |
| * Moto MPC710CE.pdf describes them, those are errata |
| * #3, #4 and #5 |
| * Note that we assume the firmware didn't choose to |
| * apply other workarounds (there are other ones documented |
| * in the .pdf). It appear that Apple firmware only works |
| * around #3 and with the same fix we use. We may want to |
| * check if the CPU is using 60x bus mode in which case |
| * the workaround for errata #4 is useless. Also, we may |
| * want to explicitly clear HID0_NOPDST as this is not |
| * needed once we have applied workaround #5 (though it's |
| * not set by Apple's firmware at least). |
| */ |
| SYM_FUNC_START_LOCAL(setup_7400_workarounds) |
| mfpvr r3 |
| rlwinm r3,r3,0,20,31 |
| cmpwi 0,r3,0x0207 |
| ble 1f |
| blr |
| SYM_FUNC_END(setup_7400_workarounds) |
| SYM_FUNC_START_LOCAL(setup_7410_workarounds) |
| mfpvr r3 |
| rlwinm r3,r3,0,20,31 |
| cmpwi 0,r3,0x0100 |
| bnelr |
| 1: |
| mfspr r11,SPRN_MSSSR0 |
| /* Errata #3: Set L1OPQ_SIZE to 0x10 */ |
| rlwinm r11,r11,0,9,6 |
| oris r11,r11,0x0100 |
| /* Errata #4: Set L2MQ_SIZE to 1 (check for MPX mode first ?) */ |
| oris r11,r11,0x0002 |
| /* Errata #5: Set DRLT_SIZE to 0x01 */ |
| rlwinm r11,r11,0,5,2 |
| oris r11,r11,0x0800 |
| sync |
| mtspr SPRN_MSSSR0,r11 |
| sync |
| isync |
| blr |
| SYM_FUNC_END(setup_7410_workarounds) |
| |
| /* 740/750/7400/7410 |
| * Enable Store Gathering (SGE), Address Broadcast (ABE), |
| * Branch History Table (BHTE), Branch Target ICache (BTIC) |
| * Dynamic Power Management (DPM), Speculative (SPD) |
| * Clear Instruction cache throttling (ICTC) |
| */ |
| SYM_FUNC_START_LOCAL(setup_750_7400_hid0) |
| mfspr r11,SPRN_HID0 |
| ori r11,r11,HID0_SGE | HID0_ABE | HID0_BHTE | HID0_BTIC |
| oris r11,r11,HID0_DPM@h |
| BEGIN_FTR_SECTION |
| xori r11,r11,HID0_BTIC |
| END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC) |
| BEGIN_FTR_SECTION |
| xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */ |
| END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM) |
| li r3,HID0_SPD |
| andc r11,r11,r3 /* clear SPD: enable speculative */ |
| li r3,0 |
| mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */ |
| isync |
| mtspr SPRN_HID0,r11 |
| sync |
| isync |
| blr |
| SYM_FUNC_END(setup_750_7400_hid0) |
| |
| /* 750cx specific |
| * Looks like we have to disable NAP feature for some PLL settings... |
| * (waiting for confirmation) |
| */ |
| SYM_FUNC_START_LOCAL(setup_750cx) |
| mfspr r10, SPRN_HID1 |
| rlwinm r10,r10,4,28,31 |
| cmpwi cr0,r10,7 |
| cmpwi cr1,r10,9 |
| cmpwi cr2,r10,11 |
| cror 4*cr0+eq,4*cr0+eq,4*cr1+eq |
| cror 4*cr0+eq,4*cr0+eq,4*cr2+eq |
| bnelr |
| lwz r6,CPU_SPEC_FEATURES(r4) |
| li r7,CPU_FTR_CAN_NAP |
| andc r6,r6,r7 |
| stw r6,CPU_SPEC_FEATURES(r4) |
| blr |
| SYM_FUNC_END(setup_750cx) |
| |
| /* 750fx specific |
| */ |
| SYM_FUNC_START_LOCAL(setup_750fx) |
| blr |
| SYM_FUNC_END(setup_750fx) |
| |
| /* MPC 745x |
| * Enable Store Gathering (SGE), Branch Folding (FOLD) |
| * Branch History Table (BHTE), Branch Target ICache (BTIC) |
| * Dynamic Power Management (DPM), Speculative (SPD) |
| * Ensure our data cache instructions really operate. |
| * Timebase has to be running or we wouldn't have made it here, |
| * just ensure we don't disable it. |
| * Clear Instruction cache throttling (ICTC) |
| * Enable L2 HW prefetch |
| */ |
| SYM_FUNC_START_LOCAL(setup_745x_specifics) |
| /* We check for the presence of an L3 cache setup by |
| * the firmware. If any, we disable NAP capability as |
| * it's known to be bogus on rev 2.1 and earlier |
| */ |
| BEGIN_FTR_SECTION |
| mfspr r11,SPRN_L3CR |
| andis. r11,r11,L3CR_L3E@h |
| beq 1f |
| END_FTR_SECTION_IFSET(CPU_FTR_L3CR) |
| lwz r6,CPU_SPEC_FEATURES(r4) |
| andis. r0,r6,CPU_FTR_L3_DISABLE_NAP@h |
| beq 1f |
| li r7,CPU_FTR_CAN_NAP |
| andc r6,r6,r7 |
| stw r6,CPU_SPEC_FEATURES(r4) |
| 1: |
| mfspr r11,SPRN_HID0 |
| |
| /* All of the bits we have to set..... |
| */ |
| ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE |
| ori r11,r11,HID0_LRSTK | HID0_BTIC |
| oris r11,r11,HID0_DPM@h |
| BEGIN_MMU_FTR_SECTION |
| oris r11,r11,HID0_HIGH_BAT@h |
| END_MMU_FTR_SECTION_IFSET(MMU_FTR_USE_HIGH_BATS) |
| BEGIN_FTR_SECTION |
| xori r11,r11,HID0_BTIC |
| END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC) |
| BEGIN_FTR_SECTION |
| xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */ |
| END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM) |
| |
| /* All of the bits we have to clear.... |
| */ |
| li r3,HID0_SPD | HID0_NOPDST | HID0_NOPTI |
| andc r11,r11,r3 /* clear SPD: enable speculative */ |
| li r3,0 |
| |
| mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */ |
| isync |
| mtspr SPRN_HID0,r11 |
| sync |
| isync |
| |
| /* Enable L2 HW prefetch, if L2 is enabled |
| */ |
| mfspr r3,SPRN_L2CR |
| andis. r3,r3,L2CR_L2E@h |
| beqlr |
| mfspr r3,SPRN_MSSCR0 |
| ori r3,r3,3 |
| sync |
| mtspr SPRN_MSSCR0,r3 |
| sync |
| isync |
| blr |
| SYM_FUNC_END(setup_745x_specifics) |
| |
| /* |
| * Initialize the FPU registers. This is needed to work around an errata |
| * in some 750 cpus where using a not yet initialized FPU register after |
| * power on reset may hang the CPU |
| */ |
| _GLOBAL(__init_fpu_registers) |
| mfmsr r10 |
| ori r11,r10,MSR_FP |
| mtmsr r11 |
| isync |
| addis r9,r3,empty_zero_page@ha |
| addi r9,r9,empty_zero_page@l |
| REST_32FPRS(0,r9) |
| sync |
| mtmsr r10 |
| isync |
| blr |
| _ASM_NOKPROBE_SYMBOL(__init_fpu_registers) |
| |
| |
| /* Definitions for the table use to save CPU states */ |
| #define CS_HID0 0 |
| #define CS_HID1 4 |
| #define CS_HID2 8 |
| #define CS_MSSCR0 12 |
| #define CS_MSSSR0 16 |
| #define CS_ICTRL 20 |
| #define CS_LDSTCR 24 |
| #define CS_LDSTDB 28 |
| #define CS_SIZE 32 |
| |
| .data |
| .balign L1_CACHE_BYTES |
| cpu_state_storage: |
| .space CS_SIZE |
| .balign L1_CACHE_BYTES,0 |
| .text |
| |
| /* Called in normal context to backup CPU 0 state. This |
| * does not include cache settings. This function is also |
| * called for machine sleep. This does not include the MMU |
| * setup, BATs, etc... but rather the "special" registers |
| * like HID0, HID1, MSSCR0, etc... |
| */ |
| _GLOBAL(__save_cpu_setup) |
| /* Some CR fields are volatile, we back it up all */ |
| mfcr r7 |
| |
| /* Get storage ptr */ |
| lis r5,cpu_state_storage@h |
| ori r5,r5,cpu_state_storage@l |
| |
| /* Save HID0 (common to all CONFIG_PPC_BOOK3S_32 cpus) */ |
| mfspr r3,SPRN_HID0 |
| stw r3,CS_HID0(r5) |
| |
| /* Now deal with CPU type dependent registers */ |
| mfspr r3,SPRN_PVR |
| srwi r3,r3,16 |
| cmplwi cr0,r3,0x8000 /* 7450 */ |
| cmplwi cr1,r3,0x000c /* 7400 */ |
| cmplwi cr2,r3,0x800c /* 7410 */ |
| cmplwi cr3,r3,0x8001 /* 7455 */ |
| cmplwi cr4,r3,0x8002 /* 7457 */ |
| cmplwi cr5,r3,0x8003 /* 7447A */ |
| cmplwi cr6,r3,0x7000 /* 750FX */ |
| cmplwi cr7,r3,0x8004 /* 7448 */ |
| /* cr1 is 7400 || 7410 */ |
| cror 4*cr1+eq,4*cr1+eq,4*cr2+eq |
| /* cr0 is 74xx */ |
| cror 4*cr0+eq,4*cr0+eq,4*cr3+eq |
| cror 4*cr0+eq,4*cr0+eq,4*cr4+eq |
| cror 4*cr0+eq,4*cr0+eq,4*cr1+eq |
| cror 4*cr0+eq,4*cr0+eq,4*cr5+eq |
| cror 4*cr0+eq,4*cr0+eq,4*cr7+eq |
| bne 1f |
| /* Backup 74xx specific regs */ |
| mfspr r4,SPRN_MSSCR0 |
| stw r4,CS_MSSCR0(r5) |
| mfspr r4,SPRN_MSSSR0 |
| stw r4,CS_MSSSR0(r5) |
| beq cr1,1f |
| /* Backup 745x specific registers */ |
| mfspr r4,SPRN_HID1 |
| stw r4,CS_HID1(r5) |
| mfspr r4,SPRN_ICTRL |
| stw r4,CS_ICTRL(r5) |
| mfspr r4,SPRN_LDSTCR |
| stw r4,CS_LDSTCR(r5) |
| mfspr r4,SPRN_LDSTDB |
| stw r4,CS_LDSTDB(r5) |
| 1: |
| bne cr6,1f |
| /* Backup 750FX specific registers */ |
| mfspr r4,SPRN_HID1 |
| stw r4,CS_HID1(r5) |
| /* If rev 2.x, backup HID2 */ |
| mfspr r3,SPRN_PVR |
| andi. r3,r3,0xff00 |
| cmpwi cr0,r3,0x0200 |
| bne 1f |
| mfspr r4,SPRN_HID2 |
| stw r4,CS_HID2(r5) |
| 1: |
| mtcr r7 |
| blr |
| |
| /* Called with no MMU context (typically MSR:IR/DR off) to |
| * restore CPU state as backed up by the previous |
| * function. This does not include cache setting |
| */ |
| _GLOBAL(__restore_cpu_setup) |
| /* Some CR fields are volatile, we back it up all */ |
| mfcr r7 |
| |
| /* Get storage ptr */ |
| lis r5,(cpu_state_storage-KERNELBASE)@h |
| ori r5,r5,cpu_state_storage@l |
| |
| /* Restore HID0 */ |
| lwz r3,CS_HID0(r5) |
| sync |
| isync |
| mtspr SPRN_HID0,r3 |
| sync |
| isync |
| |
| /* Now deal with CPU type dependent registers */ |
| mfspr r3,SPRN_PVR |
| srwi r3,r3,16 |
| cmplwi cr0,r3,0x8000 /* 7450 */ |
| cmplwi cr1,r3,0x000c /* 7400 */ |
| cmplwi cr2,r3,0x800c /* 7410 */ |
| cmplwi cr3,r3,0x8001 /* 7455 */ |
| cmplwi cr4,r3,0x8002 /* 7457 */ |
| cmplwi cr5,r3,0x8003 /* 7447A */ |
| cmplwi cr6,r3,0x7000 /* 750FX */ |
| cmplwi cr7,r3,0x8004 /* 7448 */ |
| /* cr1 is 7400 || 7410 */ |
| cror 4*cr1+eq,4*cr1+eq,4*cr2+eq |
| /* cr0 is 74xx */ |
| cror 4*cr0+eq,4*cr0+eq,4*cr3+eq |
| cror 4*cr0+eq,4*cr0+eq,4*cr4+eq |
| cror 4*cr0+eq,4*cr0+eq,4*cr1+eq |
| cror 4*cr0+eq,4*cr0+eq,4*cr5+eq |
| cror 4*cr0+eq,4*cr0+eq,4*cr7+eq |
| bne 2f |
| /* Restore 74xx specific regs */ |
| lwz r4,CS_MSSCR0(r5) |
| sync |
| mtspr SPRN_MSSCR0,r4 |
| sync |
| isync |
| lwz r4,CS_MSSSR0(r5) |
| sync |
| mtspr SPRN_MSSSR0,r4 |
| sync |
| isync |
| bne cr2,1f |
| /* Clear 7410 L2CR2 */ |
| li r4,0 |
| mtspr SPRN_L2CR2,r4 |
| 1: beq cr1,2f |
| /* Restore 745x specific registers */ |
| lwz r4,CS_HID1(r5) |
| sync |
| mtspr SPRN_HID1,r4 |
| isync |
| sync |
| lwz r4,CS_ICTRL(r5) |
| sync |
| mtspr SPRN_ICTRL,r4 |
| isync |
| sync |
| lwz r4,CS_LDSTCR(r5) |
| sync |
| mtspr SPRN_LDSTCR,r4 |
| isync |
| sync |
| lwz r4,CS_LDSTDB(r5) |
| sync |
| mtspr SPRN_LDSTDB,r4 |
| isync |
| sync |
| 2: bne cr6,1f |
| /* Restore 750FX specific registers |
| * that is restore HID2 on rev 2.x and PLL config & switch |
| * to PLL 0 on all |
| */ |
| /* If rev 2.x, restore HID2 with low voltage bit cleared */ |
| mfspr r3,SPRN_PVR |
| andi. r3,r3,0xff00 |
| cmpwi cr0,r3,0x0200 |
| bne 4f |
| lwz r4,CS_HID2(r5) |
| rlwinm r4,r4,0,19,17 |
| mtspr SPRN_HID2,r4 |
| sync |
| 4: |
| lwz r4,CS_HID1(r5) |
| rlwinm r5,r4,0,16,14 |
| mtspr SPRN_HID1,r5 |
| /* Wait for PLL to stabilize */ |
| mftbl r5 |
| 3: mftbl r6 |
| sub r6,r6,r5 |
| cmplwi cr0,r6,10000 |
| ble 3b |
| /* Setup final PLL */ |
| mtspr SPRN_HID1,r4 |
| 1: |
| mtcr r7 |
| blr |
| _ASM_NOKPROBE_SYMBOL(__restore_cpu_setup) |
| |
