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linux-next/arch/mips/netlogic/common/reset.S
Jayachandran C 94e2b96ece MIPS: Netlogic: Do not enable SUE for core 
Enabling the SUE bit for core can can result in rare cache errors
which are difficult to track down, so do not enable it. This can
cause a minor performance loss in some tests.

Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8894/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2015-04-01 17:21:53 +02:00

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/*
* Copyright 2003-2013 Broadcom Corporation.
* All Rights Reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the Broadcom
* license below:
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY BROADCOM ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL BROADCOM OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <asm/asm.h>
#include <asm/asm-offsets.h>
#include <asm/cpu.h>
#include <asm/cacheops.h>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/stackframe.h>
#include <asm/asmmacro.h>
#include <asm/addrspace.h>
#include <asm/netlogic/common.h>
#include <asm/netlogic/xlp-hal/iomap.h>
#include <asm/netlogic/xlp-hal/xlp.h>
#include <asm/netlogic/xlp-hal/sys.h>
#include <asm/netlogic/xlp-hal/cpucontrol.h>
#define CP0_EBASE $15
#define SYS_CPU_COHERENT_BASE CKSEG1ADDR(XLP_DEFAULT_IO_BASE) + \
XLP_IO_SYS_OFFSET(0) + XLP_IO_PCI_HDRSZ + \
SYS_CPU_NONCOHERENT_MODE * 4
/* Enable XLP features and workarounds in the LSU */
.macro xlp_config_lsu
li t0, LSU_DEFEATURE
mfcr t1, t0
lui t2, 0x4080 /* Enable Unaligned Access, L2HPE */
or t1, t1, t2
mtcr t1, t0
li t0, ICU_DEFEATURE
mfcr t1, t0
ori t1, 0x1000 /* Enable Icache partitioning */
mtcr t1, t0
li t0, SCHED_DEFEATURE
lui t1, 0x0100 /* Disable BRU accepting ALU ops */
mtcr t1, t0
.endm
/*
* Allow access to physical mem >64G by enabling ELPA in PAGEGRAIN
* register. This is needed before going to C code since the SP can
* in this region. Called from all HW threads.
*/
.macro xlp_early_mmu_init
mfc0 t0, CP0_PAGEMASK, 1
li t1, (1 << 29) /* ELPA bit */
or t0, t1
mtc0 t0, CP0_PAGEMASK, 1
.endm
/*
* L1D cache has to be flushed before enabling threads in XLP.
* On XLP8xx/XLP3xx, we do a low level flush using processor control
* registers. On XLPII CPUs, usual cache instructions work.
*/
.macro xlp_flush_l1_dcache
mfc0 t0, CP0_EBASE, 0
andi t0, t0, PRID_IMP_MASK
slt t1, t0, 0x1200
beqz t1, 15f
nop
/* XLP8xx low level cache flush */
li t0, LSU_DEBUG_DATA0
li t1, LSU_DEBUG_ADDR
li t2, 0 /* index */
li t3, 0x1000 /* loop count */
11:
sll v0, t2, 5
mtcr zero, t0
ori v1, v0, 0x3 /* way0 | write_enable | write_active */
mtcr v1, t1
12:
mfcr v1, t1
andi v1, 0x1 /* wait for write_active == 0 */
bnez v1, 12b
nop
mtcr zero, t0
ori v1, v0, 0x7 /* way1 | write_enable | write_active */
mtcr v1, t1
13:
mfcr v1, t1
andi v1, 0x1 /* wait for write_active == 0 */
bnez v1, 13b
nop
addi t2, 1
bne t3, t2, 11b
nop
b 17f
nop
/* XLPII CPUs, Invalidate all 64k of L1 D-cache */
15:
li t0, 0x80000000
li t1, 0x80010000
16: cache Index_Writeback_Inv_D, 0(t0)
addiu t0, t0, 32
bne t0, t1, 16b
nop
17:
.endm
/*
* nlm_reset_entry will be copied to the reset entry point for
* XLR and XLP. The XLP cores start here when they are woken up. This
* is also the NMI entry point.
*
* We use scratch reg 6/7 to save k0/k1 and check for NMI first.
*
* The data corresponding to reset/NMI is stored at RESET_DATA_PHYS
* location, this will have the thread mask (used when core is woken up)
* and the current NMI handler in case we reached here for an NMI.
*
* When a core or thread is newly woken up, it marks itself ready and
* loops in a 'wait'. When the CPU really needs waking up, we send an NMI
* IPI to it, with the NMI handler set to prom_boot_secondary_cpus
*/
.set noreorder
.set noat
.set arch=xlr /* for mfcr/mtcr, XLR is sufficient */
FEXPORT(nlm_reset_entry)
dmtc0 k0, $22, 6
dmtc0 k1, $22, 7
mfc0 k0, CP0_STATUS
li k1, 0x80000
and k1, k0, k1
beqz k1, 1f /* go to real reset entry */
nop
li k1, CKSEG1ADDR(RESET_DATA_PHYS) /* NMI */
ld k0, BOOT_NMI_HANDLER(k1)
jr k0
nop
1: /* Entry point on core wakeup */
mfc0 t0, CP0_EBASE, 0 /* processor ID */
andi t0, PRID_IMP_MASK
li t1, 0x1500 /* XLP 9xx */
beq t0, t1, 2f /* does not need to set coherent */
nop
li t1, 0x1300 /* XLP 5xx */
beq t0, t1, 2f /* does not need to set coherent */
nop
/* set bit in SYS coherent register for the core */
mfc0 t0, CP0_EBASE, 1
mfc0 t1, CP0_EBASE, 1
srl t1, 5
andi t1, 0x3 /* t1 <- node */
li t2, 0x40000
mul t3, t2, t1 /* t3 = node * 0x40000 */
srl t0, t0, 2
and t0, t0, 0x7 /* t0 <- core */
li t1, 0x1
sll t0, t1, t0
nor t0, t0, zero /* t0 <- ~(1 << core) */
li t2, SYS_CPU_COHERENT_BASE
add t2, t2, t3 /* t2 <- SYS offset for node */
lw t1, 0(t2)
and t1, t1, t0
sw t1, 0(t2)
/* read back to ensure complete */
lw t1, 0(t2)
sync
2:
/* Configure LSU on Non-0 Cores. */
xlp_config_lsu
/* FALL THROUGH */
/*
* Wake up sibling threads from the initial thread in a core.
*/
EXPORT(nlm_boot_siblings)
/* core L1D flush before enable threads */
xlp_flush_l1_dcache
/* save ra and sp, will be used later (only for boot cpu) */
dmtc0 ra, $22, 6
dmtc0 sp, $22, 7
/* Enable hw threads by writing to MAP_THREADMODE of the core */
li t0, CKSEG1ADDR(RESET_DATA_PHYS)
lw t1, BOOT_THREAD_MODE(t0) /* t1 <- thread mode */
li t0, ((CPU_BLOCKID_MAP << 8) | MAP_THREADMODE)
mfcr t2, t0
or t2, t2, t1
mtcr t2, t0
/*
* The new hardware thread starts at the next instruction
* For all the cases other than core 0 thread 0, we will
* jump to the secondary wait function.
* NOTE: All GPR contents are lost after the mtcr above!
*/
mfc0 v0, CP0_EBASE, 1
andi v0, 0x3ff /* v0 <- node/core */
/*
* Errata: to avoid potential live lock, setup IFU_BRUB_RESERVE
* when running 4 threads per core
*/
andi v1, v0, 0x3 /* v1 <- thread id */
bnez v1, 2f
nop
/* thread 0 of each core. */
li t0, CKSEG1ADDR(RESET_DATA_PHYS)
lw t1, BOOT_THREAD_MODE(t0) /* t1 <- thread mode */
subu t1, 0x3 /* 4-thread per core mode? */
bnez t1, 2f
nop
li t0, IFU_BRUB_RESERVE
li t1, 0x55
mtcr t1, t0
_ehb
2:
beqz v0, 4f /* boot cpu (cpuid == 0)? */
nop
/* setup status reg */
move t1, zero
#ifdef CONFIG_64BIT
ori t1, ST0_KX
#endif
mtc0 t1, CP0_STATUS
xlp_early_mmu_init
/* mark CPU ready */
li t3, CKSEG1ADDR(RESET_DATA_PHYS)
ADDIU t1, t3, BOOT_CPU_READY
sll v1, v0, 2
PTR_ADDU t1, v1
li t2, 1
sw t2, 0(t1)
/* Wait until NMI hits */
3: wait
b 3b
nop
/*
* For the boot CPU, we have to restore ra and sp and return, rest
* of the registers will be restored by the caller
*/
4:
dmfc0 ra, $22, 6
dmfc0 sp, $22, 7
jr ra
nop
EXPORT(nlm_reset_entry_end)
LEAF(nlm_init_boot_cpu)
#ifdef CONFIG_CPU_XLP
xlp_config_lsu
xlp_early_mmu_init
#endif
jr ra
nop
END(nlm_init_boot_cpu)
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