mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 00:21:59 +00:00
c2be5bfcc9
There are some common macros for Tegra low-level assembly code. Clean up them into one header file and move the definitions that will be re-used into it as well. Signed-off-by: Joseph Lo <josephl@nvidia.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
209 lines
5.2 KiB
ArmAsm
209 lines
5.2 KiB
ArmAsm
#include <linux/linkage.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/cache.h>
|
|
|
|
#include <mach/iomap.h>
|
|
|
|
#include "flowctrl.h"
|
|
#include "reset.h"
|
|
#include "sleep.h"
|
|
|
|
#define APB_MISC_GP_HIDREV 0x804
|
|
#define PMC_SCRATCH41 0x140
|
|
|
|
#define RESET_DATA(x) ((TEGRA_RESET_##x)*4)
|
|
|
|
.section ".text.head", "ax"
|
|
__CPUINIT
|
|
|
|
/*
|
|
* Tegra specific entry point for secondary CPUs.
|
|
* The secondary kernel init calls v7_flush_dcache_all before it enables
|
|
* the L1; however, the L1 comes out of reset in an undefined state, so
|
|
* the clean + invalidate performed by v7_flush_dcache_all causes a bunch
|
|
* of cache lines with uninitialized data and uninitialized tags to get
|
|
* written out to memory, which does really unpleasant things to the main
|
|
* processor. We fix this by performing an invalidate, rather than a
|
|
* clean + invalidate, before jumping into the kernel.
|
|
*/
|
|
ENTRY(v7_invalidate_l1)
|
|
mov r0, #0
|
|
mcr p15, 2, r0, c0, c0, 0
|
|
mrc p15, 1, r0, c0, c0, 0
|
|
|
|
ldr r1, =0x7fff
|
|
and r2, r1, r0, lsr #13
|
|
|
|
ldr r1, =0x3ff
|
|
|
|
and r3, r1, r0, lsr #3 @ NumWays - 1
|
|
add r2, r2, #1 @ NumSets
|
|
|
|
and r0, r0, #0x7
|
|
add r0, r0, #4 @ SetShift
|
|
|
|
clz r1, r3 @ WayShift
|
|
add r4, r3, #1 @ NumWays
|
|
1: sub r2, r2, #1 @ NumSets--
|
|
mov r3, r4 @ Temp = NumWays
|
|
2: subs r3, r3, #1 @ Temp--
|
|
mov r5, r3, lsl r1
|
|
mov r6, r2, lsl r0
|
|
orr r5, r5, r6 @ Reg = (Temp<<WayShift)|(NumSets<<SetShift)
|
|
mcr p15, 0, r5, c7, c6, 2
|
|
bgt 2b
|
|
cmp r2, #0
|
|
bgt 1b
|
|
dsb
|
|
isb
|
|
mov pc, lr
|
|
ENDPROC(v7_invalidate_l1)
|
|
|
|
|
|
ENTRY(tegra_secondary_startup)
|
|
bl v7_invalidate_l1
|
|
/* Enable coresight */
|
|
mov32 r0, 0xC5ACCE55
|
|
mcr p14, 0, r0, c7, c12, 6
|
|
b secondary_startup
|
|
ENDPROC(tegra_secondary_startup)
|
|
|
|
.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:
|
|
*
|
|
* 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
|
|
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? */
|
|
mov32 r6, TEGRA_APB_MISC_BASE
|
|
ldr r0, [r6, #APB_MISC_GP_HIDREV]
|
|
and r0, r0, #0xff00
|
|
cmp r0, #(0x20 << 8)
|
|
bne 1f
|
|
/* If not CPU0, don't let CPU0 reset CPU1 now that CPU1 is coming up. */
|
|
mov32 r6, TEGRA_PMC_BASE
|
|
mov r0, #0
|
|
cmp r10, #0
|
|
strne r0, [r6, #PMC_SCRATCH41]
|
|
1:
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
/*
|
|
* Can only be secondary boot (initial or hotplug) but CPU 0
|
|
* cannot be here.
|
|
*/
|
|
cmp r10, #0
|
|
bleq __die @ CPU0 cannot be here
|
|
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? */
|
|
mov32 r6, TEGRA_APB_MISC_BASE
|
|
ldr r0, [r6, #APB_MISC_GP_HIDREV]
|
|
and r0, r0, #0xff00
|
|
cmp r0, #(0x20 << 8)
|
|
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)
|