linux/arch/mips/kernel/cps-vec.S
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

631 lines
12 KiB
ArmAsm

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2013 Imagination Technologies
* Author: Paul Burton <paul.burton@mips.com>
*/
#include <asm/addrspace.h>
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/asmmacro.h>
#include <asm/cacheops.h>
#include <asm/eva.h>
#include <asm/mipsregs.h>
#include <asm/mipsmtregs.h>
#include <asm/pm.h>
#define GCR_CPC_BASE_OFS 0x0088
#define GCR_CL_COHERENCE_OFS 0x2008
#define GCR_CL_ID_OFS 0x2028
#define CPC_CL_VC_STOP_OFS 0x2020
#define CPC_CL_VC_RUN_OFS 0x2028
.extern mips_cm_base
.set noreorder
#ifdef CONFIG_64BIT
# define STATUS_BITDEPS ST0_KX
#else
# define STATUS_BITDEPS 0
#endif
#ifdef CONFIG_MIPS_CPS_NS16550
#define DUMP_EXCEP(name) \
PTR_LA a0, 8f; \
jal mips_cps_bev_dump; \
nop; \
TEXT(name)
#else /* !CONFIG_MIPS_CPS_NS16550 */
#define DUMP_EXCEP(name)
#endif /* !CONFIG_MIPS_CPS_NS16550 */
/*
* Set dest to non-zero if the core supports the MT ASE, else zero. If
* MT is not supported then branch to nomt.
*/
.macro has_mt dest, nomt
mfc0 \dest, CP0_CONFIG, 1
bgez \dest, \nomt
mfc0 \dest, CP0_CONFIG, 2
bgez \dest, \nomt
mfc0 \dest, CP0_CONFIG, 3
andi \dest, \dest, MIPS_CONF3_MT
beqz \dest, \nomt
nop
.endm
/*
* Set dest to non-zero if the core supports MIPSr6 multithreading
* (ie. VPs), else zero. If MIPSr6 multithreading is not supported then
* branch to nomt.
*/
.macro has_vp dest, nomt
mfc0 \dest, CP0_CONFIG, 1
bgez \dest, \nomt
mfc0 \dest, CP0_CONFIG, 2
bgez \dest, \nomt
mfc0 \dest, CP0_CONFIG, 3
bgez \dest, \nomt
mfc0 \dest, CP0_CONFIG, 4
bgez \dest, \nomt
mfc0 \dest, CP0_CONFIG, 5
andi \dest, \dest, MIPS_CONF5_VP
beqz \dest, \nomt
nop
.endm
/* Calculate an uncached address for the CM GCRs */
.macro cmgcrb dest
.set push
.set noat
MFC0 $1, CP0_CMGCRBASE
PTR_SLL $1, $1, 4
PTR_LI \dest, UNCAC_BASE
PTR_ADDU \dest, \dest, $1
.set pop
.endm
.section .text.cps-vec
.balign 0x1000
LEAF(mips_cps_core_entry)
/*
* These first 4 bytes will be patched by cps_smp_setup to load the
* CCA to use into register s0.
*/
.word 0
/* Check whether we're here due to an NMI */
mfc0 k0, CP0_STATUS
and k0, k0, ST0_NMI
beqz k0, not_nmi
nop
/* This is an NMI */
PTR_LA k0, nmi_handler
jr k0
nop
not_nmi:
/* Setup Cause */
li t0, CAUSEF_IV
mtc0 t0, CP0_CAUSE
/* Setup Status */
li t0, ST0_CU1 | ST0_CU0 | ST0_BEV | STATUS_BITDEPS
mtc0 t0, CP0_STATUS
/* Skip cache & coherence setup if we're already coherent */
cmgcrb v1
lw s7, GCR_CL_COHERENCE_OFS(v1)
bnez s7, 1f
nop
/* Initialize the L1 caches */
jal mips_cps_cache_init
nop
/* Enter the coherent domain */
li t0, 0xff
sw t0, GCR_CL_COHERENCE_OFS(v1)
ehb
/* Set Kseg0 CCA to that in s0 */
1: mfc0 t0, CP0_CONFIG
ori t0, 0x7
xori t0, 0x7
or t0, t0, s0
mtc0 t0, CP0_CONFIG
ehb
/* Jump to kseg0 */
PTR_LA t0, 1f
jr t0
nop
/*
* We're up, cached & coherent. Perform any EVA initialization necessary
* before we access memory.
*/
1: eva_init
/* Retrieve boot configuration pointers */
jal mips_cps_get_bootcfg
nop
/* Skip core-level init if we started up coherent */
bnez s7, 1f
nop
/* Perform any further required core-level initialisation */
jal mips_cps_core_init
nop
/*
* Boot any other VPEs within this core that should be online, and
* deactivate this VPE if it should be offline.
*/
move a1, t9
jal mips_cps_boot_vpes
move a0, v0
/* Off we go! */
1: PTR_L t1, VPEBOOTCFG_PC(v1)
PTR_L gp, VPEBOOTCFG_GP(v1)
PTR_L sp, VPEBOOTCFG_SP(v1)
jr t1
nop
END(mips_cps_core_entry)
.org 0x200
LEAF(excep_tlbfill)
DUMP_EXCEP("TLB Fill")
b .
nop
END(excep_tlbfill)
.org 0x280
LEAF(excep_xtlbfill)
DUMP_EXCEP("XTLB Fill")
b .
nop
END(excep_xtlbfill)
.org 0x300
LEAF(excep_cache)
DUMP_EXCEP("Cache")
b .
nop
END(excep_cache)
.org 0x380
LEAF(excep_genex)
DUMP_EXCEP("General")
b .
nop
END(excep_genex)
.org 0x400
LEAF(excep_intex)
DUMP_EXCEP("Interrupt")
b .
nop
END(excep_intex)
.org 0x480
LEAF(excep_ejtag)
PTR_LA k0, ejtag_debug_handler
jr k0
nop
END(excep_ejtag)
LEAF(mips_cps_core_init)
#ifdef CONFIG_MIPS_MT_SMP
/* Check that the core implements the MT ASE */
has_mt t0, 3f
.set push
.set MIPS_ISA_LEVEL_RAW
.set mt
/* Only allow 1 TC per VPE to execute... */
dmt
/* ...and for the moment only 1 VPE */
dvpe
PTR_LA t1, 1f
jr.hb t1
nop
/* Enter VPE configuration state */
1: mfc0 t0, CP0_MVPCONTROL
ori t0, t0, MVPCONTROL_VPC
mtc0 t0, CP0_MVPCONTROL
/* Retrieve the number of VPEs within the core */
mfc0 t0, CP0_MVPCONF0
srl t0, t0, MVPCONF0_PVPE_SHIFT
andi t0, t0, (MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT)
addiu ta3, t0, 1
/* If there's only 1, we're done */
beqz t0, 2f
nop
/* Loop through each VPE within this core */
li ta1, 1
1: /* Operate on the appropriate TC */
mtc0 ta1, CP0_VPECONTROL
ehb
/* Bind TC to VPE (1:1 TC:VPE mapping) */
mttc0 ta1, CP0_TCBIND
/* Set exclusive TC, non-active, master */
li t0, VPECONF0_MVP
sll t1, ta1, VPECONF0_XTC_SHIFT
or t0, t0, t1
mttc0 t0, CP0_VPECONF0
/* Set TC non-active, non-allocatable */
mttc0 zero, CP0_TCSTATUS
/* Set TC halted */
li t0, TCHALT_H
mttc0 t0, CP0_TCHALT
/* Next VPE */
addiu ta1, ta1, 1
slt t0, ta1, ta3
bnez t0, 1b
nop
/* Leave VPE configuration state */
2: mfc0 t0, CP0_MVPCONTROL
xori t0, t0, MVPCONTROL_VPC
mtc0 t0, CP0_MVPCONTROL
3: .set pop
#endif
jr ra
nop
END(mips_cps_core_init)
/**
* mips_cps_get_bootcfg() - retrieve boot configuration pointers
*
* Returns: pointer to struct core_boot_config in v0, pointer to
* struct vpe_boot_config in v1, VPE ID in t9
*/
LEAF(mips_cps_get_bootcfg)
/* Calculate a pointer to this cores struct core_boot_config */
cmgcrb t0
lw t0, GCR_CL_ID_OFS(t0)
li t1, COREBOOTCFG_SIZE
mul t0, t0, t1
PTR_LA t1, mips_cps_core_bootcfg
PTR_L t1, 0(t1)
PTR_ADDU v0, t0, t1
/* Calculate this VPEs ID. If the core doesn't support MT use 0 */
li t9, 0
#if defined(CONFIG_CPU_MIPSR6)
has_vp ta2, 1f
/*
* Assume non-contiguous numbering. Perhaps some day we'll need
* to handle contiguous VP numbering, but no such systems yet
* exist.
*/
mfc0 t9, CP0_GLOBALNUMBER
andi t9, t9, MIPS_GLOBALNUMBER_VP
#elif defined(CONFIG_MIPS_MT_SMP)
has_mt ta2, 1f
/* Find the number of VPEs present in the core */
mfc0 t1, CP0_MVPCONF0
srl t1, t1, MVPCONF0_PVPE_SHIFT
andi t1, t1, MVPCONF0_PVPE >> MVPCONF0_PVPE_SHIFT
addiu t1, t1, 1
/* Calculate a mask for the VPE ID from EBase.CPUNum */
clz t1, t1
li t2, 31
subu t1, t2, t1
li t2, 1
sll t1, t2, t1
addiu t1, t1, -1
/* Retrieve the VPE ID from EBase.CPUNum */
mfc0 t9, $15, 1
and t9, t9, t1
#endif
1: /* Calculate a pointer to this VPEs struct vpe_boot_config */
li t1, VPEBOOTCFG_SIZE
mul v1, t9, t1
PTR_L ta3, COREBOOTCFG_VPECONFIG(v0)
PTR_ADDU v1, v1, ta3
jr ra
nop
END(mips_cps_get_bootcfg)
LEAF(mips_cps_boot_vpes)
lw ta2, COREBOOTCFG_VPEMASK(a0)
PTR_L ta3, COREBOOTCFG_VPECONFIG(a0)
#if defined(CONFIG_CPU_MIPSR6)
has_vp t0, 5f
/* Find base address of CPC */
cmgcrb t3
PTR_L t1, GCR_CPC_BASE_OFS(t3)
PTR_LI t2, ~0x7fff
and t1, t1, t2
PTR_LI t2, UNCAC_BASE
PTR_ADD t1, t1, t2
/* Start any other VPs that ought to be running */
PTR_S ta2, CPC_CL_VC_RUN_OFS(t1)
/* Ensure this VP stops running if it shouldn't be */
not ta2
PTR_S ta2, CPC_CL_VC_STOP_OFS(t1)
ehb
#elif defined(CONFIG_MIPS_MT)
/* If the core doesn't support MT then return */
has_mt t0, 5f
/* Enter VPE configuration state */
.set push
.set MIPS_ISA_LEVEL_RAW
.set mt
dvpe
.set pop
PTR_LA t1, 1f
jr.hb t1
nop
1: mfc0 t1, CP0_MVPCONTROL
ori t1, t1, MVPCONTROL_VPC
mtc0 t1, CP0_MVPCONTROL
ehb
/* Loop through each VPE */
move t8, ta2
li ta1, 0
/* Check whether the VPE should be running. If not, skip it */
1: andi t0, ta2, 1
beqz t0, 2f
nop
/* Operate on the appropriate TC */
mfc0 t0, CP0_VPECONTROL
ori t0, t0, VPECONTROL_TARGTC
xori t0, t0, VPECONTROL_TARGTC
or t0, t0, ta1
mtc0 t0, CP0_VPECONTROL
ehb
.set push
.set MIPS_ISA_LEVEL_RAW
.set mt
/* Skip the VPE if its TC is not halted */
mftc0 t0, CP0_TCHALT
beqz t0, 2f
nop
/* Calculate a pointer to the VPEs struct vpe_boot_config */
li t0, VPEBOOTCFG_SIZE
mul t0, t0, ta1
addu t0, t0, ta3
/* Set the TC restart PC */
lw t1, VPEBOOTCFG_PC(t0)
mttc0 t1, CP0_TCRESTART
/* Set the TC stack pointer */
lw t1, VPEBOOTCFG_SP(t0)
mttgpr t1, sp
/* Set the TC global pointer */
lw t1, VPEBOOTCFG_GP(t0)
mttgpr t1, gp
/* Copy config from this VPE */
mfc0 t0, CP0_CONFIG
mttc0 t0, CP0_CONFIG
/*
* Copy the EVA config from this VPE if the CPU supports it.
* CONFIG3 must exist to be running MT startup - just read it.
*/
mfc0 t0, CP0_CONFIG, 3
and t0, t0, MIPS_CONF3_SC
beqz t0, 3f
nop
mfc0 t0, CP0_SEGCTL0
mttc0 t0, CP0_SEGCTL0
mfc0 t0, CP0_SEGCTL1
mttc0 t0, CP0_SEGCTL1
mfc0 t0, CP0_SEGCTL2
mttc0 t0, CP0_SEGCTL2
3:
/* Ensure no software interrupts are pending */
mttc0 zero, CP0_CAUSE
mttc0 zero, CP0_STATUS
/* Set TC active, not interrupt exempt */
mftc0 t0, CP0_TCSTATUS
li t1, ~TCSTATUS_IXMT
and t0, t0, t1
ori t0, t0, TCSTATUS_A
mttc0 t0, CP0_TCSTATUS
/* Clear the TC halt bit */
mttc0 zero, CP0_TCHALT
/* Set VPE active */
mftc0 t0, CP0_VPECONF0
ori t0, t0, VPECONF0_VPA
mttc0 t0, CP0_VPECONF0
/* Next VPE */
2: srl ta2, ta2, 1
addiu ta1, ta1, 1
bnez ta2, 1b
nop
/* Leave VPE configuration state */
mfc0 t1, CP0_MVPCONTROL
xori t1, t1, MVPCONTROL_VPC
mtc0 t1, CP0_MVPCONTROL
ehb
evpe
.set pop
/* Check whether this VPE is meant to be running */
li t0, 1
sll t0, t0, a1
and t0, t0, t8
bnez t0, 2f
nop
/* This VPE should be offline, halt the TC */
li t0, TCHALT_H
mtc0 t0, CP0_TCHALT
PTR_LA t0, 1f
1: jr.hb t0
nop
2:
#endif /* CONFIG_MIPS_MT_SMP */
/* Return */
5: jr ra
nop
END(mips_cps_boot_vpes)
LEAF(mips_cps_cache_init)
/*
* Clear the bits used to index the caches. Note that the architecture
* dictates that writing to any of TagLo or TagHi selects 0 or 2 should
* be valid for all MIPS32 CPUs, even those for which said writes are
* unnecessary.
*/
mtc0 zero, CP0_TAGLO, 0
mtc0 zero, CP0_TAGHI, 0
mtc0 zero, CP0_TAGLO, 2
mtc0 zero, CP0_TAGHI, 2
ehb
/* Primary cache configuration is indicated by Config1 */
mfc0 v0, CP0_CONFIG, 1
/* Detect I-cache line size */
_EXT t0, v0, MIPS_CONF1_IL_SHF, MIPS_CONF1_IL_SZ
beqz t0, icache_done
li t1, 2
sllv t0, t1, t0
/* Detect I-cache size */
_EXT t1, v0, MIPS_CONF1_IS_SHF, MIPS_CONF1_IS_SZ
xori t2, t1, 0x7
beqz t2, 1f
li t3, 32
addiu t1, t1, 1
sllv t1, t3, t1
1: /* At this point t1 == I-cache sets per way */
_EXT t2, v0, MIPS_CONF1_IA_SHF, MIPS_CONF1_IA_SZ
addiu t2, t2, 1
mul t1, t1, t0
mul t1, t1, t2
li a0, CKSEG0
PTR_ADD a1, a0, t1
1: cache Index_Store_Tag_I, 0(a0)
PTR_ADD a0, a0, t0
bne a0, a1, 1b
nop
icache_done:
/* Detect D-cache line size */
_EXT t0, v0, MIPS_CONF1_DL_SHF, MIPS_CONF1_DL_SZ
beqz t0, dcache_done
li t1, 2
sllv t0, t1, t0
/* Detect D-cache size */
_EXT t1, v0, MIPS_CONF1_DS_SHF, MIPS_CONF1_DS_SZ
xori t2, t1, 0x7
beqz t2, 1f
li t3, 32
addiu t1, t1, 1
sllv t1, t3, t1
1: /* At this point t1 == D-cache sets per way */
_EXT t2, v0, MIPS_CONF1_DA_SHF, MIPS_CONF1_DA_SZ
addiu t2, t2, 1
mul t1, t1, t0
mul t1, t1, t2
li a0, CKSEG0
PTR_ADDU a1, a0, t1
PTR_SUBU a1, a1, t0
1: cache Index_Store_Tag_D, 0(a0)
bne a0, a1, 1b
PTR_ADD a0, a0, t0
dcache_done:
jr ra
nop
END(mips_cps_cache_init)
#if defined(CONFIG_MIPS_CPS_PM) && defined(CONFIG_CPU_PM)
/* Calculate a pointer to this CPUs struct mips_static_suspend_state */
.macro psstate dest
.set push
.set noat
lw $1, TI_CPU(gp)
sll $1, $1, LONGLOG
PTR_LA \dest, __per_cpu_offset
addu $1, $1, \dest
lw $1, 0($1)
PTR_LA \dest, cps_cpu_state
addu \dest, \dest, $1
.set pop
.endm
LEAF(mips_cps_pm_save)
/* Save CPU state */
SUSPEND_SAVE_REGS
psstate t1
SUSPEND_SAVE_STATIC
jr v0
nop
END(mips_cps_pm_save)
LEAF(mips_cps_pm_restore)
/* Restore CPU state */
psstate t1
RESUME_RESTORE_STATIC
RESUME_RESTORE_REGS_RETURN
END(mips_cps_pm_restore)
#endif /* CONFIG_MIPS_CPS_PM && CONFIG_CPU_PM */