476 lines
10 KiB
ArmAsm
476 lines
10 KiB
ArmAsm
/*
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* This file contains low level CPU setup functions.
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* Copyright (C) 2003 Benjamin Herrenschmidt (benh@kernel.crashing.org)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/cputable.h>
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#include <asm/ppc_asm.h>
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#include <asm/asm-offsets.h>
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#include <asm/cache.h>
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_GLOBAL(__setup_cpu_603)
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b setup_common_caches
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_GLOBAL(__setup_cpu_604)
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mflr r4
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bl setup_common_caches
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bl setup_604_hid0
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mtlr r4
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blr
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_GLOBAL(__setup_cpu_750)
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mflr r4
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bl __init_fpu_registers
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bl setup_common_caches
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bl setup_750_7400_hid0
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mtlr r4
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blr
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_GLOBAL(__setup_cpu_750cx)
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mflr r4
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bl __init_fpu_registers
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bl setup_common_caches
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bl setup_750_7400_hid0
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bl setup_750cx
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mtlr r4
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blr
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_GLOBAL(__setup_cpu_750fx)
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mflr r4
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bl __init_fpu_registers
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bl setup_common_caches
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bl setup_750_7400_hid0
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bl setup_750fx
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mtlr r4
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blr
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_GLOBAL(__setup_cpu_7400)
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mflr r4
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bl __init_fpu_registers
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bl setup_7400_workarounds
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bl setup_common_caches
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bl setup_750_7400_hid0
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mtlr r4
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blr
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_GLOBAL(__setup_cpu_7410)
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mflr r4
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bl __init_fpu_registers
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bl setup_7410_workarounds
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bl setup_common_caches
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bl setup_750_7400_hid0
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li r3,0
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mtspr SPRN_L2CR2,r3
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mtlr r4
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blr
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_GLOBAL(__setup_cpu_745x)
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mflr r4
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bl setup_common_caches
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bl setup_745x_specifics
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mtlr r4
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blr
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/* Enable caches for 603's, 604, 750 & 7400 */
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setup_common_caches:
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mfspr r11,SPRN_HID0
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andi. r0,r11,HID0_DCE
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ori r11,r11,HID0_ICE|HID0_DCE
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ori r8,r11,HID0_ICFI
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bne 1f /* don't invalidate the D-cache */
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ori r8,r8,HID0_DCI /* unless it wasn't enabled */
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1: sync
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mtspr SPRN_HID0,r8 /* enable and invalidate caches */
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sync
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mtspr SPRN_HID0,r11 /* enable caches */
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sync
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isync
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blr
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/* 604, 604e, 604ev, ...
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* Enable superscalar execution & branch history table
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*/
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setup_604_hid0:
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mfspr r11,SPRN_HID0
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ori r11,r11,HID0_SIED|HID0_BHTE
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ori r8,r11,HID0_BTCD
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sync
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mtspr SPRN_HID0,r8 /* flush branch target address cache */
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sync /* on 604e/604r */
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mtspr SPRN_HID0,r11
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sync
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isync
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blr
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/* 7400 <= rev 2.7 and 7410 rev = 1.0 suffer from some
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* erratas we work around here.
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* Moto MPC710CE.pdf describes them, those are errata
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* #3, #4 and #5
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* Note that we assume the firmware didn't choose to
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* apply other workarounds (there are other ones documented
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* in the .pdf). It appear that Apple firmware only works
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* around #3 and with the same fix we use. We may want to
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* check if the CPU is using 60x bus mode in which case
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* the workaround for errata #4 is useless. Also, we may
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* want to explicitly clear HID0_NOPDST as this is not
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* needed once we have applied workaround #5 (though it's
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* not set by Apple's firmware at least).
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*/
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setup_7400_workarounds:
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mfpvr r3
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rlwinm r3,r3,0,20,31
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cmpwi 0,r3,0x0207
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ble 1f
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blr
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setup_7410_workarounds:
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mfpvr r3
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rlwinm r3,r3,0,20,31
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cmpwi 0,r3,0x0100
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bnelr
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1:
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mfspr r11,SPRN_MSSSR0
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/* Errata #3: Set L1OPQ_SIZE to 0x10 */
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rlwinm r11,r11,0,9,6
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oris r11,r11,0x0100
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/* Errata #4: Set L2MQ_SIZE to 1 (check for MPX mode first ?) */
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oris r11,r11,0x0002
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/* Errata #5: Set DRLT_SIZE to 0x01 */
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rlwinm r11,r11,0,5,2
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oris r11,r11,0x0800
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sync
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mtspr SPRN_MSSSR0,r11
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sync
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isync
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blr
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/* 740/750/7400/7410
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* Enable Store Gathering (SGE), Address Brodcast (ABE),
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* Branch History Table (BHTE), Branch Target ICache (BTIC)
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* Dynamic Power Management (DPM), Speculative (SPD)
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* Clear Instruction cache throttling (ICTC)
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*/
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setup_750_7400_hid0:
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mfspr r11,SPRN_HID0
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ori r11,r11,HID0_SGE | HID0_ABE | HID0_BHTE | HID0_BTIC
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oris r11,r11,HID0_DPM@h
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BEGIN_FTR_SECTION
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xori r11,r11,HID0_BTIC
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END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
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BEGIN_FTR_SECTION
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xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */
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END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
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li r3,HID0_SPD
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andc r11,r11,r3 /* clear SPD: enable speculative */
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li r3,0
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mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */
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isync
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mtspr SPRN_HID0,r11
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sync
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isync
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blr
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/* 750cx specific
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* Looks like we have to disable NAP feature for some PLL settings...
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* (waiting for confirmation)
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*/
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setup_750cx:
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mfspr r10, SPRN_HID1
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rlwinm r10,r10,4,28,31
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cmpwi cr0,r10,7
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cmpwi cr1,r10,9
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cmpwi cr2,r10,11
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cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
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cror 4*cr0+eq,4*cr0+eq,4*cr2+eq
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bnelr
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lwz r6,CPU_SPEC_FEATURES(r5)
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li r7,CPU_FTR_CAN_NAP
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andc r6,r6,r7
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stw r6,CPU_SPEC_FEATURES(r5)
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blr
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/* 750fx specific
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*/
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setup_750fx:
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blr
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/* MPC 745x
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* Enable Store Gathering (SGE), Branch Folding (FOLD)
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* Branch History Table (BHTE), Branch Target ICache (BTIC)
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* Dynamic Power Management (DPM), Speculative (SPD)
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* Ensure our data cache instructions really operate.
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* Timebase has to be running or we wouldn't have made it here,
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* just ensure we don't disable it.
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* Clear Instruction cache throttling (ICTC)
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* Enable L2 HW prefetch
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*/
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setup_745x_specifics:
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/* We check for the presence of an L3 cache setup by
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* the firmware. If any, we disable NAP capability as
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* it's known to be bogus on rev 2.1 and earlier
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*/
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BEGIN_FTR_SECTION
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mfspr r11,SPRN_L3CR
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andis. r11,r11,L3CR_L3E@h
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beq 1f
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END_FTR_SECTION_IFSET(CPU_FTR_L3CR)
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lwz r6,CPU_SPEC_FEATURES(r5)
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andi. r0,r6,CPU_FTR_L3_DISABLE_NAP
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beq 1f
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li r7,CPU_FTR_CAN_NAP
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andc r6,r6,r7
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stw r6,CPU_SPEC_FEATURES(r5)
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1:
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mfspr r11,SPRN_HID0
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/* All of the bits we have to set.....
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*/
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ori r11,r11,HID0_SGE | HID0_FOLD | HID0_BHTE
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ori r11,r11,HID0_LRSTK | HID0_BTIC
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oris r11,r11,HID0_DPM@h
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BEGIN_FTR_SECTION
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xori r11,r11,HID0_BTIC
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END_FTR_SECTION_IFSET(CPU_FTR_NO_BTIC)
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BEGIN_FTR_SECTION
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xoris r11,r11,HID0_DPM@h /* disable dynamic power mgmt */
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END_FTR_SECTION_IFSET(CPU_FTR_NO_DPM)
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/* All of the bits we have to clear....
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*/
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li r3,HID0_SPD | HID0_NOPDST | HID0_NOPTI
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andc r11,r11,r3 /* clear SPD: enable speculative */
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li r3,0
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mtspr SPRN_ICTC,r3 /* Instruction Cache Throttling off */
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isync
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mtspr SPRN_HID0,r11
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sync
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isync
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/* Enable L2 HW prefetch, if L2 is enabled
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*/
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mfspr r3,SPRN_L2CR
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andis. r3,r3,L2CR_L2E@h
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beqlr
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mfspr r3,SPRN_MSSCR0
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ori r3,r3,3
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sync
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mtspr SPRN_MSSCR0,r3
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sync
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isync
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blr
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/*
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* Initialize the FPU registers. This is needed to work around an errata
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* in some 750 cpus where using a not yet initialized FPU register after
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* power on reset may hang the CPU
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*/
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_GLOBAL(__init_fpu_registers)
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mfmsr r10
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ori r11,r10,MSR_FP
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mtmsr r11
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isync
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addis r9,r3,empty_zero_page@ha
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addi r9,r9,empty_zero_page@l
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REST_32FPRS(0,r9)
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sync
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mtmsr r10
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isync
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blr
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/* Definitions for the table use to save CPU states */
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#define CS_HID0 0
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#define CS_HID1 4
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#define CS_HID2 8
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#define CS_MSSCR0 12
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#define CS_MSSSR0 16
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#define CS_ICTRL 20
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#define CS_LDSTCR 24
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#define CS_LDSTDB 28
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#define CS_SIZE 32
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.data
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.balign L1_CACHE_BYTES
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cpu_state_storage:
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.space CS_SIZE
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.balign L1_CACHE_BYTES,0
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.text
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/* Called in normal context to backup CPU 0 state. This
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* does not include cache settings. This function is also
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* called for machine sleep. This does not include the MMU
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* setup, BATs, etc... but rather the "special" registers
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* like HID0, HID1, MSSCR0, etc...
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*/
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_GLOBAL(__save_cpu_setup)
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/* Some CR fields are volatile, we back it up all */
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mfcr r7
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/* Get storage ptr */
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lis r5,cpu_state_storage@h
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ori r5,r5,cpu_state_storage@l
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/* Save HID0 (common to all CONFIG_6xx cpus) */
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mfspr r3,SPRN_HID0
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stw r3,CS_HID0(r5)
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/* Now deal with CPU type dependent registers */
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mfspr r3,SPRN_PVR
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srwi r3,r3,16
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cmplwi cr0,r3,0x8000 /* 7450 */
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cmplwi cr1,r3,0x000c /* 7400 */
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cmplwi cr2,r3,0x800c /* 7410 */
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cmplwi cr3,r3,0x8001 /* 7455 */
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cmplwi cr4,r3,0x8002 /* 7457 */
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cmplwi cr5,r3,0x8003 /* 7447A */
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cmplwi cr6,r3,0x7000 /* 750FX */
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cmplwi cr7,r3,0x8004 /* 7448 */
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/* cr1 is 7400 || 7410 */
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cror 4*cr1+eq,4*cr1+eq,4*cr2+eq
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/* cr0 is 74xx */
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cror 4*cr0+eq,4*cr0+eq,4*cr3+eq
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cror 4*cr0+eq,4*cr0+eq,4*cr4+eq
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cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
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cror 4*cr0+eq,4*cr0+eq,4*cr5+eq
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cror 4*cr0+eq,4*cr0+eq,4*cr7+eq
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bne 1f
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/* Backup 74xx specific regs */
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mfspr r4,SPRN_MSSCR0
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stw r4,CS_MSSCR0(r5)
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mfspr r4,SPRN_MSSSR0
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stw r4,CS_MSSSR0(r5)
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beq cr1,1f
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/* Backup 745x specific registers */
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mfspr r4,SPRN_HID1
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stw r4,CS_HID1(r5)
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mfspr r4,SPRN_ICTRL
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stw r4,CS_ICTRL(r5)
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mfspr r4,SPRN_LDSTCR
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stw r4,CS_LDSTCR(r5)
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mfspr r4,SPRN_LDSTDB
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stw r4,CS_LDSTDB(r5)
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1:
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bne cr6,1f
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/* Backup 750FX specific registers */
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mfspr r4,SPRN_HID1
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stw r4,CS_HID1(r5)
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/* If rev 2.x, backup HID2 */
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mfspr r3,SPRN_PVR
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andi. r3,r3,0xff00
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cmpwi cr0,r3,0x0200
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bne 1f
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mfspr r4,SPRN_HID2
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stw r4,CS_HID2(r5)
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1:
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mtcr r7
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blr
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/* Called with no MMU context (typically MSR:IR/DR off) to
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* restore CPU state as backed up by the previous
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* function. This does not include cache setting
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*/
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_GLOBAL(__restore_cpu_setup)
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/* Some CR fields are volatile, we back it up all */
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mfcr r7
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/* Get storage ptr */
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lis r5,(cpu_state_storage-KERNELBASE)@h
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ori r5,r5,cpu_state_storage@l
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/* Restore HID0 */
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lwz r3,CS_HID0(r5)
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sync
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isync
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mtspr SPRN_HID0,r3
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sync
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isync
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/* Now deal with CPU type dependent registers */
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mfspr r3,SPRN_PVR
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srwi r3,r3,16
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cmplwi cr0,r3,0x8000 /* 7450 */
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cmplwi cr1,r3,0x000c /* 7400 */
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cmplwi cr2,r3,0x800c /* 7410 */
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cmplwi cr3,r3,0x8001 /* 7455 */
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cmplwi cr4,r3,0x8002 /* 7457 */
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cmplwi cr5,r3,0x8003 /* 7447A */
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cmplwi cr6,r3,0x7000 /* 750FX */
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cmplwi cr7,r3,0x8004 /* 7448 */
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/* cr1 is 7400 || 7410 */
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cror 4*cr1+eq,4*cr1+eq,4*cr2+eq
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/* cr0 is 74xx */
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cror 4*cr0+eq,4*cr0+eq,4*cr3+eq
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cror 4*cr0+eq,4*cr0+eq,4*cr4+eq
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cror 4*cr0+eq,4*cr0+eq,4*cr1+eq
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cror 4*cr0+eq,4*cr0+eq,4*cr5+eq
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cror 4*cr0+eq,4*cr0+eq,4*cr7+eq
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bne 2f
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/* Restore 74xx specific regs */
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lwz r4,CS_MSSCR0(r5)
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sync
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mtspr SPRN_MSSCR0,r4
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sync
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isync
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lwz r4,CS_MSSSR0(r5)
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sync
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mtspr SPRN_MSSSR0,r4
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sync
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isync
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bne cr2,1f
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/* Clear 7410 L2CR2 */
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li r4,0
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mtspr SPRN_L2CR2,r4
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1: beq cr1,2f
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/* Restore 745x specific registers */
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lwz r4,CS_HID1(r5)
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sync
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mtspr SPRN_HID1,r4
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isync
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sync
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lwz r4,CS_ICTRL(r5)
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sync
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mtspr SPRN_ICTRL,r4
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isync
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sync
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lwz r4,CS_LDSTCR(r5)
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sync
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mtspr SPRN_LDSTCR,r4
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isync
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sync
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lwz r4,CS_LDSTDB(r5)
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sync
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mtspr SPRN_LDSTDB,r4
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isync
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sync
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2: bne cr6,1f
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/* Restore 750FX specific registers
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* that is restore HID2 on rev 2.x and PLL config & switch
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* to PLL 0 on all
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*/
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/* If rev 2.x, restore HID2 with low voltage bit cleared */
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mfspr r3,SPRN_PVR
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andi. r3,r3,0xff00
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cmpwi cr0,r3,0x0200
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bne 4f
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lwz r4,CS_HID2(r5)
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rlwinm r4,r4,0,19,17
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mtspr SPRN_HID2,r4
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sync
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4:
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lwz r4,CS_HID1(r5)
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rlwinm r5,r4,0,16,14
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mtspr SPRN_HID1,r5
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/* Wait for PLL to stabilize */
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mftbl r5
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3: mftbl r6
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sub r6,r6,r5
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cmplwi cr0,r6,10000
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ble 3b
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/* Setup final PLL */
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mtspr SPRN_HID1,r4
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1:
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mtcr r7
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blr
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