/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* This file contains low level CPU setup functions.
* Kumar Gala <galak@kernel.crashing.org>
* Copyright 2009 Freescale Semiconductor, Inc.
*
* Based on cpu_setup_6xx code by
* Benjamin Herrenschmidt <benh@kernel.crashing.org>
*/
#include <linux/linkage.h>
#include <asm/page.h>
#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/ppc_asm.h>
#include <asm/nohash/mmu-e500.h>
#include <asm/asm-offsets.h>
#include <asm/mpc85xx.h>
_
GLOBAL(__e500_icache_setup)
mfspr r0, SPRN_L1CSR1
andi. r3, r0, L1CSR1_ICE
bnelr
/* Already enabled */
oris r0, r0, L1CSR1_CPE@h
ori r0, r0, (L1CSR1_ICFI | L1CSR1_ICLFR | L1CSR1_ICE)
mtspr SPRN_L1CSR1, r0
/* Enable I-Cache */
isync
blr
_
GLOBAL(__e500_dcache_setup)
mfspr r0, SPRN_L1CSR0
andi. r3, r0, L1CSR0_DCE
bnelr
/* Already enabled */
msync
isync
li r0, 0
mtspr SPRN_L1CSR0, r0
/* Disable */
msync
isync
li r0, (L1CSR0_DCFI | L1CSR0_CLFC)
mtspr SPRN_L1CSR0, r0
/* Invalidate */
isync
1: mfspr r0, SPRN_L1CSR0
andi. r3, r0, L1CSR0_CLFC
bne+ 1b
/* Wait for lock bits reset */
oris r0, r0, L1CSR0_CPE@h
ori r0, r0, L1CSR0_DCE
msync
isync
mtspr SPRN_L1CSR0, r0
/* Enable */
isync
blr
/*
* FIXME - we haven't yet done testing to determine a reasonable default
* value for PW20_WAIT_IDLE_BIT.
*/
#define PW20_WAIT_IDLE_BIT 50
/* 1ms, TB frequency is 41.66MHZ */
_
GLOBAL(setup_pw20_idle)
mfspr r3, SPRN_PWRMGTCR0
/* Set PW20_WAIT bit, enable pw20 state*/
ori r3, r3, PWRMGTCR0_PW20_WAIT
li r11, PW20_WAIT_IDLE_BIT
/* Set Automatic PW20 Core Idle Count */
rlwimi r3, r11, PWRMGTCR0_PW20_ENT_SHIFT, PWRMGTCR0_PW20_ENT
mtspr SPRN_PWRMGTCR0, r3
blr
/*
* FIXME - we haven't yet done testing to determine a reasonable default
* value for AV_WAIT_IDLE_BIT.
*/
#define AV_WAIT_IDLE_BIT 50
/* 1ms, TB frequency is 41.66MHZ */
_
GLOBAL(setup_altivec_idle)
mfspr r3, SPRN_PWRMGTCR0
/* Enable Altivec Idle */
oris r3, r3, PWRMGTCR0_AV_IDLE_PD_EN@h
li r11, AV_WAIT_IDLE_BIT
/* Set Automatic AltiVec Idle Count */
rlwimi r3, r11, PWRMGTCR0_AV_IDLE_CNT_SHIFT, PWRMGTCR0_AV_IDLE_CNT
mtspr SPRN_PWRMGTCR0, r3
blr
#ifdef CONFIG_PPC_E500MC
_
GLOBAL(__setup_cpu_e6500)
mflr r6
#ifdef CONFIG_PPC64
bl setup_altivec_ivors
/* Touch IVOR42 only if the CPU supports E.HV category */
mfspr r10,SPRN_MMUCFG
rlwinm. r10,r10,0,MMUCFG_LPIDSIZE
beq 1f
bl setup_lrat_ivor
1:
#endif
bl setup_pw20_idle
bl setup_altivec_idle
bl __setup_cpu_e5500
mtlr r6
blr
#endif
/* CONFIG_PPC_E500MC */
#ifdef CONFIG_PPC32
#ifdef CONFIG_PPC_E500
#ifndef CONFIG_PPC_E500MC
_
GLOBAL(__setup_cpu_e500v1)
_
GLOBAL(__setup_cpu_e500v2)
mflr r4
bl __e500_icache_setup
bl __e500_dcache_setup
bl __setup_e500_ivors
#if defined(CONFIG_FSL_RIO) || defined(CONFIG_FSL_PCI)
/* Ensure that RFXE is set */
mfspr r3,SPRN_HID1
oris r3,r3,HID1_RFXE@h
mtspr SPRN_HID1,r3
#endif
mtlr r4
blr
#else
/* CONFIG_PPC_E500MC */
_
GLOBAL(__setup_cpu_e500mc)
_
GLOBAL(__setup_cpu_e5500)
mflr r5
bl __e500_icache_setup
bl __e500_dcache_setup
bl __setup_e500mc_ivors
/*
* We only want to touch IVOR38-41 if we're running on hardware
* that supports category E.HV. The architectural way to determine
* this is MMUCFG[LPIDSIZE].
*/
mfspr r3, SPRN_MMUCFG
rlwinm. r3, r3, 0, MMUCFG_LPIDSIZE
beq 1f
bl __setup_ehv_ivors
b 2f
1:
lwz r3, CPU_SPEC_FEATURES(r4)
/* We need this check as cpu_setup is also called for
* the secondary cores. So, if we have already cleared
* the feature on the primary core, avoid doing it on the
* secondary core.
*/
andi. r6, r3, CPU_FTR_EMB_HV
beq 2f
rlwinm r3, r3, 0, ~CPU_FTR_EMB_HV
stw r3, CPU_SPEC_FEATURES(r4)
2:
mtlr r5
blr
#endif
/* CONFIG_PPC_E500MC */
#endif
/* CONFIG_PPC_E500 */
#endif
/* CONFIG_PPC32 */
#ifdef CONFIG_PPC_BOOK3E_64
_
GLOBAL(__restore_cpu_e6500)
mflr r5
bl setup_altivec_ivors
/* Touch IVOR42 only if the CPU supports E.HV category */
mfspr r10,SPRN_MMUCFG
rlwinm. r10,r10,0,MMUCFG_LPIDSIZE
beq 1f
bl setup_lrat_ivor
1:
bl setup_pw20_idle
bl setup_altivec_idle
bl __restore_cpu_e5500
mtlr r5
blr
_
GLOBAL(__restore_cpu_e5500)
mflr r4
bl __e500_icache_setup
bl __e500_dcache_setup
bl __setup_base_ivors
bl setup_perfmon_ivor
bl setup_doorbell_ivors
/*
* We only want to touch IVOR38-41 if we're running on hardware
* that supports category E.HV. The architectural way to determine
* this is MMUCFG[LPIDSIZE].
*/
mfspr r10,SPRN_MMUCFG
rlwinm. r10,r10,0,MMUCFG_LPIDSIZE
beq 1f
bl setup_ehv_ivors
1:
mtlr r4
blr
_
GLOBAL(__setup_cpu_e5500)
mflr r5
bl __e500_icache_setup
bl __e500_dcache_setup
bl __setup_base_ivors
bl setup_perfmon_ivor
bl setup_doorbell_ivors
/*
* We only want to touch IVOR38-41 if we're running on hardware
* that supports category E.HV. The architectural way to determine
* this is MMUCFG[LPIDSIZE].
*/
mfspr r10,SPRN_MMUCFG
rlwinm. r10,r10,0,MMUCFG_LPIDSIZE
beq 1f
bl setup_ehv_ivors
b 2f
1:
ld r10,CPU_SPEC_FEATURES(r4)
LOAD_REG_IMMEDIATE(r9,CPU_FTR_EMB_HV)
andc r10,r10,r9
std r10,CPU_SPEC_FEATURES(r4)
2:
mtlr r5
blr
#endif
/* flush L1 data cache, it can apply to e500v2, e500mc and e5500 */
_
GLOBAL(flush_dcache_L1)
mfmsr r10
wrteei 0
mfspr r3,SPRN_L1CFG0
rlwinm r5,r3,9,3
/* Extract cache block size */
twlgti r5,1
/* Only 32 and 64 byte cache blocks
* are currently defined.
*/
li r4,32
subfic r6,r5,2
/* r6 = log2(1KiB / cache block size) -
* log2(number of ways)
*/
slw r5,r4,r5
/* r5 = cache block size */
rlwinm r7,r3,0,0xff
/* Extract number of KiB in the cache */
mulli r7,r7,13
/* An 8-way cache will require 13
* loads per set.
*/
slw r7,r7,r6
/* save off HID0 and set DCFA */
mfspr r8,SPRN_HID0
ori r9,r8,HID0_DCFA@l
mtspr SPRN_HID0,r9
isync
LOAD_REG_IMMEDIATE(r6, KERNELBASE)
mr r4, r6
mtctr r7
1: lwz r3,0(r4)
/* Load... */
add r4,r4,r5
bdnz 1b
msync
mr r4, r6
mtctr r7
1: dcbf 0,r4
/* ...and flush. */
add r4,r4,r5
bdnz 1b
/* restore HID0 */
mtspr SPRN_HID0,r8
isync
wrtee r10
blr
SYM_FUNC_START_LOCAL(has_L2_cache)
/* skip L2 cache on P2040/P2040E as they have no L2 cache */
mfspr r3, SPRN_SVR
/* shift right by 8 bits and clear E bit of SVR */
rlwinm r4, r3, 24, ~0x800
lis r3, SVR_P2040@h
ori r3, r3, SVR_P2040@l
cmpw r4, r3
beq 1f
li r3, 1
blr
1:
li r3, 0
blr
SYM_FUNC_END(has_L2_cache)
/* flush backside L2 cache */
SYM_FUNC_START_LOCAL(flush_backside_L2_cache)
mflr r10
bl has_L2_cache
mtlr r10
cmpwi r3, 0
beq 2f
/* Flush the L2 cache */
mfspr r3, SPRN_L2CSR0
ori r3, r3, L2CSR0_L2FL@l
msync
isync
mtspr SPRN_L2CSR0,r3
isync
/* check if it is complete */
1: mfspr r3,SPRN_L2CSR0
andi. r3, r3, L2CSR0_L2FL@l
bne 1b
2:
blr
SYM_FUNC_END(flush_backside_L2_cache)
_
GLOBAL(cpu_down_flush_e500v2)
mflr r0
bl flush_dcache_L1
mtlr r0
blr
_
GLOBAL(cpu_down_flush_e500mc)
_
GLOBAL(cpu_down_flush_e5500)
mflr r0
bl flush_dcache_L1
bl flush_backside_L2_cache
mtlr r0
blr
/* L1 Data Cache of e6500 contains no modified data, no flush is required */
_
GLOBAL(cpu_down_flush_e6500)
blr
