mirror of
https://github.com/torvalds/linux.git
synced 2024-11-07 04:32:03 +00:00
d127e9c5c5
Because the CPU0 was the first up and the last down core when cluster power up/down or platform suspend. So only CPU0 needs the rest of the functions to reset flow controller and re-enable SCU and L2. We also move the L2 init function for Cortex-A15 to there. The secondery CPU can just call cpu_resume. Signed-off-by: Joseph Lo <josephl@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
290 lines
6.8 KiB
ArmAsm
290 lines
6.8 KiB
ArmAsm
/*
|
|
* Copyright (c) 2012, NVIDIA Corporation. All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/cache.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/hardware/cache-l2x0.h>
|
|
|
|
#include "flowctrl.h"
|
|
#include "fuse.h"
|
|
#include "iomap.h"
|
|
#include "reset.h"
|
|
#include "sleep.h"
|
|
|
|
#define PMC_SCRATCH41 0x140
|
|
|
|
#define RESET_DATA(x) ((TEGRA_RESET_##x)*4)
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
/*
|
|
* tegra_resume
|
|
*
|
|
* CPU boot vector when restarting the a CPU following
|
|
* an LP2 transition. Also branched to by LP0 and LP1 resume after
|
|
* re-enabling sdram.
|
|
*
|
|
* r6: SoC ID
|
|
* r8: CPU part number
|
|
*/
|
|
ENTRY(tegra_resume)
|
|
check_cpu_part_num 0xc09, r8, r9
|
|
bleq v7_invalidate_l1
|
|
|
|
cpu_id r0
|
|
cmp r0, #0 @ CPU0?
|
|
THUMB( it ne )
|
|
bne cpu_resume @ no
|
|
|
|
/* Are we on Tegra20? */
|
|
cmp r6, #TEGRA20
|
|
beq 1f @ Yes
|
|
/* Clear the flow controller flags for this CPU. */
|
|
cpu_to_csr_reg r1, r0
|
|
mov32 r2, TEGRA_FLOW_CTRL_BASE
|
|
ldr r1, [r2, r1]
|
|
/* Clear event & intr flag */
|
|
orr r1, r1, \
|
|
#FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
|
|
movw r0, #0x3FFD @ enable, cluster_switch, immed, bitmaps
|
|
@ & ext flags for CPU power mgnt
|
|
bic r1, r1, r0
|
|
str r1, [r2]
|
|
1:
|
|
|
|
mov32 r9, 0xc09
|
|
cmp r8, r9
|
|
bne end_ca9_scu_l2_resume
|
|
#ifdef CONFIG_HAVE_ARM_SCU
|
|
/* enable SCU */
|
|
mov32 r0, TEGRA_ARM_PERIF_BASE
|
|
ldr r1, [r0]
|
|
orr r1, r1, #1
|
|
str r1, [r0]
|
|
#endif
|
|
|
|
/* L2 cache resume & re-enable */
|
|
l2_cache_resume r0, r1, r2, l2x0_saved_regs_addr
|
|
end_ca9_scu_l2_resume:
|
|
mov32 r9, 0xc0f
|
|
cmp r8, r9
|
|
bleq tegra_init_l2_for_a15
|
|
|
|
b cpu_resume
|
|
ENDPROC(tegra_resume)
|
|
#endif
|
|
|
|
#ifdef CONFIG_CACHE_L2X0
|
|
.globl l2x0_saved_regs_addr
|
|
l2x0_saved_regs_addr:
|
|
.long 0
|
|
#endif
|
|
|
|
.align L1_CACHE_SHIFT
|
|
ENTRY(__tegra_cpu_reset_handler_start)
|
|
|
|
/*
|
|
* __tegra_cpu_reset_handler:
|
|
*
|
|
* Common handler for all CPU reset events.
|
|
*
|
|
* Register usage within the reset handler:
|
|
*
|
|
* Others: scratch
|
|
* R6 = SoC ID
|
|
* R7 = CPU present (to the OS) mask
|
|
* R8 = CPU in LP1 state mask
|
|
* R9 = CPU in LP2 state mask
|
|
* R10 = CPU number
|
|
* R11 = CPU mask
|
|
* R12 = pointer to reset handler data
|
|
*
|
|
* NOTE: This code is copied to IRAM. All code and data accesses
|
|
* must be position-independent.
|
|
*/
|
|
|
|
.align L1_CACHE_SHIFT
|
|
ENTRY(__tegra_cpu_reset_handler)
|
|
|
|
cpsid aif, 0x13 @ SVC mode, interrupts disabled
|
|
|
|
tegra_get_soc_id TEGRA_APB_MISC_BASE, r6
|
|
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
|
|
t20_check:
|
|
cmp r6, #TEGRA20
|
|
bne after_t20_check
|
|
t20_errata:
|
|
# Tegra20 is a Cortex-A9 r1p1
|
|
mrc p15, 0, r0, c1, c0, 0 @ read system control register
|
|
orr r0, r0, #1 << 14 @ erratum 716044
|
|
mcr p15, 0, r0, c1, c0, 0 @ write system control register
|
|
mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
|
|
orr r0, r0, #1 << 4 @ erratum 742230
|
|
orr r0, r0, #1 << 11 @ erratum 751472
|
|
mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
|
|
b after_errata
|
|
after_t20_check:
|
|
#endif
|
|
#ifdef CONFIG_ARCH_TEGRA_3x_SOC
|
|
t30_check:
|
|
cmp r6, #TEGRA30
|
|
bne after_t30_check
|
|
t30_errata:
|
|
# Tegra30 is a Cortex-A9 r2p9
|
|
mrc p15, 0, r0, c15, c0, 1 @ read diagnostic register
|
|
orr r0, r0, #1 << 6 @ erratum 743622
|
|
orr r0, r0, #1 << 11 @ erratum 751472
|
|
mcr p15, 0, r0, c15, c0, 1 @ write diagnostic register
|
|
b after_errata
|
|
after_t30_check:
|
|
#endif
|
|
after_errata:
|
|
mrc p15, 0, r10, c0, c0, 5 @ MPIDR
|
|
and r10, r10, #0x3 @ R10 = CPU number
|
|
mov r11, #1
|
|
mov r11, r11, lsl r10 @ R11 = CPU mask
|
|
adr r12, __tegra_cpu_reset_handler_data
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* Does the OS know about this CPU? */
|
|
ldr r7, [r12, #RESET_DATA(MASK_PRESENT)]
|
|
tst r7, r11 @ if !present
|
|
bleq __die @ CPU not present (to OS)
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
|
|
/* Are we on Tegra20? */
|
|
cmp r6, #TEGRA20
|
|
bne 1f
|
|
/* If not CPU0, don't let CPU0 reset CPU1 now that CPU1 is coming up. */
|
|
mov32 r5, TEGRA_PMC_BASE
|
|
mov r0, #0
|
|
cmp r10, #0
|
|
strne r0, [r5, #PMC_SCRATCH41]
|
|
1:
|
|
#endif
|
|
|
|
/* Waking up from LP1? */
|
|
ldr r8, [r12, #RESET_DATA(MASK_LP1)]
|
|
tst r8, r11 @ if in_lp1
|
|
beq __is_not_lp1
|
|
cmp r10, #0
|
|
bne __die @ only CPU0 can be here
|
|
ldr lr, [r12, #RESET_DATA(STARTUP_LP1)]
|
|
cmp lr, #0
|
|
bleq __die @ no LP1 startup handler
|
|
THUMB( add lr, lr, #1 ) @ switch to Thumb mode
|
|
bx lr
|
|
__is_not_lp1:
|
|
|
|
/* Waking up from LP2? */
|
|
ldr r9, [r12, #RESET_DATA(MASK_LP2)]
|
|
tst r9, r11 @ if in_lp2
|
|
beq __is_not_lp2
|
|
ldr lr, [r12, #RESET_DATA(STARTUP_LP2)]
|
|
cmp lr, #0
|
|
bleq __die @ no LP2 startup handler
|
|
bx lr
|
|
|
|
__is_not_lp2:
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* Can only be secondary boot (initial or hotplug)
|
|
* CPU0 can't be here for Tegra20/30
|
|
*/
|
|
cmp r6, #TEGRA114
|
|
beq __no_cpu0_chk
|
|
cmp r10, #0
|
|
bleq __die @ CPU0 cannot be here
|
|
__no_cpu0_chk:
|
|
ldr lr, [r12, #RESET_DATA(STARTUP_SECONDARY)]
|
|
cmp lr, #0
|
|
bleq __die @ no secondary startup handler
|
|
bx lr
|
|
#endif
|
|
|
|
/*
|
|
* We don't know why the CPU reset. Just kill it.
|
|
* The LR register will contain the address we died at + 4.
|
|
*/
|
|
|
|
__die:
|
|
sub lr, lr, #4
|
|
mov32 r7, TEGRA_PMC_BASE
|
|
str lr, [r7, #PMC_SCRATCH41]
|
|
|
|
mov32 r7, TEGRA_CLK_RESET_BASE
|
|
|
|
/* Are we on Tegra20? */
|
|
cmp r6, #TEGRA20
|
|
bne 1f
|
|
|
|
#ifdef CONFIG_ARCH_TEGRA_2x_SOC
|
|
mov32 r0, 0x1111
|
|
mov r1, r0, lsl r10
|
|
str r1, [r7, #0x340] @ CLK_RST_CPU_CMPLX_SET
|
|
#endif
|
|
1:
|
|
#ifdef CONFIG_ARCH_TEGRA_3x_SOC
|
|
mov32 r6, TEGRA_FLOW_CTRL_BASE
|
|
|
|
cmp r10, #0
|
|
moveq r1, #FLOW_CTRL_HALT_CPU0_EVENTS
|
|
moveq r2, #FLOW_CTRL_CPU0_CSR
|
|
movne r1, r10, lsl #3
|
|
addne r2, r1, #(FLOW_CTRL_CPU1_CSR-8)
|
|
addne r1, r1, #(FLOW_CTRL_HALT_CPU1_EVENTS-8)
|
|
|
|
/* Clear CPU "event" and "interrupt" flags and power gate
|
|
it when halting but not before it is in the "WFI" state. */
|
|
ldr r0, [r6, +r2]
|
|
orr r0, r0, #FLOW_CTRL_CSR_INTR_FLAG | FLOW_CTRL_CSR_EVENT_FLAG
|
|
orr r0, r0, #FLOW_CTRL_CSR_ENABLE
|
|
str r0, [r6, +r2]
|
|
|
|
/* Unconditionally halt this CPU */
|
|
mov r0, #FLOW_CTRL_WAITEVENT
|
|
str r0, [r6, +r1]
|
|
ldr r0, [r6, +r1] @ memory barrier
|
|
|
|
dsb
|
|
isb
|
|
wfi @ CPU should be power gated here
|
|
|
|
/* If the CPU didn't power gate above just kill it's clock. */
|
|
|
|
mov r0, r11, lsl #8
|
|
str r0, [r7, #348] @ CLK_CPU_CMPLX_SET
|
|
#endif
|
|
|
|
/* If the CPU still isn't dead, just spin here. */
|
|
b .
|
|
ENDPROC(__tegra_cpu_reset_handler)
|
|
|
|
.align L1_CACHE_SHIFT
|
|
.type __tegra_cpu_reset_handler_data, %object
|
|
.globl __tegra_cpu_reset_handler_data
|
|
__tegra_cpu_reset_handler_data:
|
|
.rept TEGRA_RESET_DATA_SIZE
|
|
.long 0
|
|
.endr
|
|
.align L1_CACHE_SHIFT
|
|
|
|
ENTRY(__tegra_cpu_reset_handler_end)
|