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MIPS: Netlogic: SMP wakeup code update 

Update for core intialization code.  Initialize status register
after receiving NMI for CPU wakeup. Add the low level L1D flush
code before enabling threads in core.

Also convert the ehb to _ehb so that it works under more GCC
versions.

Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3755/
Patchwork: https://patchwork.linux-mips.org/patch/4095/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Jayachandran C 2012-07-24 17:28:47 +02:00 committed by Ralf Baechle
parent cedc8ef87c
commit 51d1eac0cd
2 changed files with 45 additions and 6 deletions
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4
arch/mips/include/asm/netlogic/xlp-hal/cpucontrol.h
View File

@ -47,7 +47,9 @@
#define CPU_BLOCKID_MAP 10
#define LSU_DEFEATURE 0x304
#define LSU_CERRLOG_REGID 0x09
#define LSU_DEBUG_ADDR 0x305
#define LSU_DEBUG_DATA0 0x306
#define LSU_CERRLOG_REGID 0x309
#define SCHED_DEFEATURE 0x700
/* Offsets of interest from the 'MAP' Block */

47
arch/mips/netlogic/common/smpboot.S
View File

@ -80,6 +80,38 @@
* This is the code that 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.
*/
.macro xlp_flush_l1_dcache
li t0, LSU_DEBUG_DATA0
li t1, LSU_DEBUG_ADDR
li t2, 0 /* index */
li t3, 0x1000 /* loop count */
1:
sll v0, t2, 5
mtcr zero, t0
ori v1, v0, 0x3 /* way0 | write_enable | write_active */
mtcr v1, t1
2:
mfcr v1, t1
andi v1, 0x1 /* wait for write_active == 0 */
bnez v1, 2b
nop
mtcr zero, t0
ori v1, v0, 0x7 /* way1 | write_enable | write_active */
mtcr v1, t1
3:
mfcr v1, t1
andi v1, 0x1 /* wait for write_active == 0 */
bnez v1, 3b
nop
addi t2, 1
bne t3, t2, 1b
nop
.endm
/*
* The cores can come start when they are woken up. This is also the NMI
* entry, so check that 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)
@ -138,6 +170,8 @@ FEXPORT(nlm_reset_entry)
* a core.
*/
EXPORT(nlm_boot_siblings)
/* core L1D flush before enable threads */
xlp_flush_l1_dcache
/* 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 */
@ -164,16 +198,13 @@ EXPORT(nlm_boot_siblings)
li t0, MMU_SETUP
li t1, 0
mtcr t1, t0
ehb
_ehb
2: beqz v0, 4f /* boot cpu (cpuid == 0)? */
nop
/* setup status reg */
mfc0 t1, CP0_STATUS
li t0, ST0_BEV
or t1, t0
xor t1, t0
move t1, zero
#ifdef CONFIG_64BIT
ori t1, ST0_KX
#endif
@ -220,6 +251,12 @@ FEXPORT(xlp_boot_core0_siblings) /* "Master" cpu starts from here */
__CPUINIT
NESTED(nlm_boot_secondary_cpus, 16, sp)
/* Initialize CP0 Status */
move t1, zero
#ifdef CONFIG_64BIT
ori t1, ST0_KX
#endif
mtc0 t1, CP0_STATUS
PTR_LA t1, nlm_next_sp
PTR_L sp, 0(t1)
PTR_LA t1, nlm_next_gp