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ARM: tegra: retain L2 content over CPU suspend/resume

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The L2 RAM is in different power domain from the CPU cluster. So the
L2 content can be retained over CPU suspend/resume. To do that, we
need to disable L2 after the MMU is disabled, and enable L2 before
the MMU is enabled. But the L2 controller is in the same power domain
with the CPU cluster. We need to restore it's settings and re-enable
it after the power be resumed.

Signed-off-by: Joseph Lo <josephl@nvidia.com>
Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>
This commit is contained in:
Joseph Lo 2012-11-13 10:04:48 +08:00 committed by Stephen Warren
parent d552920a02
commit 29a0e7beab
6 changed files with 57 additions and 3 deletions
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6
arch/arm/mach-tegra/common.c
View file

@ -36,6 +36,7 @@
#include "pmc.h"
#include "apbio.h"
#include "sleep.h"
#include "pm.h"
/*
* Storage for debug-macro.S's state.
@ -117,6 +118,7 @@ static __initdata struct tegra_clk_init_table tegra30_clk_init_table[] = {
static void __init tegra_init_cache(void)
{
#ifdef CONFIG_CACHE_L2X0
int ret;
void __iomem *p = IO_ADDRESS(TEGRA_ARM_PERIF_BASE) + 0x3000;
u32 aux_ctrl, cache_type;
@ -124,7 +126,9 @@ static void __init tegra_init_cache(void)
aux_ctrl = (cache_type & 0x700) << (17-8);
aux_ctrl |= 0x7C400001;
l2x0_of_init(aux_ctrl, 0x8200c3fe);
ret = l2x0_of_init(aux_ctrl, 0x8200c3fe);
if (!ret)
l2x0_saved_regs_addr = virt_to_phys(&l2x0_saved_regs);
#endif
}

11
arch/arm/mach-tegra/headsmp.S
View file

@ -2,6 +2,8 @@
#include <linux/init.h>
#include <asm/cache.h>
#include <asm/asm-offsets.h>
#include <asm/hardware/cache-l2x0.h>
#include "flowctrl.h"
#include "iomap.h"
@ -113,10 +115,19 @@ ENTRY(tegra_resume)
str r1, [r0]
#endif
/* L2 cache resume & re-enable */
l2_cache_resume r0, r1, r2, l2x0_saved_regs_addr
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)

2
arch/arm/mach-tegra/pm.c
View file

@ -207,11 +207,9 @@ void tegra_idle_lp2_last(u32 cpu_on_time, u32 cpu_off_time)
cpu_cluster_pm_enter();
suspend_cpu_complex();
outer_disable();
cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);
outer_resume();
restore_cpu_complex();
cpu_cluster_pm_exit();
}

2
arch/arm/mach-tegra/pm.h
View file

@ -21,6 +21,8 @@
#ifndef _MACH_TEGRA_PM_H_
#define _MACH_TEGRA_PM_H_
extern unsigned long l2x0_saved_regs_addr;
void save_cpu_arch_register(void);
void restore_cpu_arch_register(void);

7
arch/arm/mach-tegra/sleep.S
View file

@ -27,6 +27,7 @@
#include <asm/assembler.h>
#include <asm/cache.h>
#include <asm/cp15.h>
#include <asm/hardware/cache-l2x0.h>
#include "iomap.h"
@ -98,6 +99,12 @@ ENTRY(tegra_shut_off_mmu)
dsb
mcr p15, 0, r3, c1, c0, 0
isb
#ifdef CONFIG_CACHE_L2X0
/* Disable L2 cache */
mov32 r4, TEGRA_ARM_PERIF_BASE + 0x3000
mov r5, #0
str r5, [r4, #L2X0_CTRL]
#endif
mov pc, r0
ENDPROC(tegra_shut_off_mmu)
.popsection

32
arch/arm/mach-tegra/sleep.h
View file

@ -71,6 +71,38 @@
str \tmp2, [\tmp1] @ invalidate SCU tags for CPU
dsb
.endm
/* Macro to resume & re-enable L2 cache */
#ifndef L2X0_CTRL_EN
#define L2X0_CTRL_EN 1
#endif
#ifdef CONFIG_CACHE_L2X0
.macro l2_cache_resume, tmp1, tmp2, tmp3, phys_l2x0_saved_regs
adr \tmp1, \phys_l2x0_saved_regs
ldr \tmp1, [\tmp1]
ldr \tmp2, [\tmp1, #L2X0_R_PHY_BASE]
ldr \tmp3, [\tmp2, #L2X0_CTRL]
tst \tmp3, #L2X0_CTRL_EN
bne exit_l2_resume
ldr \tmp3, [\tmp1, #L2X0_R_TAG_LATENCY]
str \tmp3, [\tmp2, #L2X0_TAG_LATENCY_CTRL]
ldr \tmp3, [\tmp1, #L2X0_R_DATA_LATENCY]
str \tmp3, [\tmp2, #L2X0_DATA_LATENCY_CTRL]
ldr \tmp3, [\tmp1, #L2X0_R_PREFETCH_CTRL]
str \tmp3, [\tmp2, #L2X0_PREFETCH_CTRL]
ldr \tmp3, [\tmp1, #L2X0_R_PWR_CTRL]
str \tmp3, [\tmp2, #L2X0_POWER_CTRL]
ldr \tmp3, [\tmp1, #L2X0_R_AUX_CTRL]
str \tmp3, [\tmp2, #L2X0_AUX_CTRL]
mov \tmp3, #L2X0_CTRL_EN
str \tmp3, [\tmp2, #L2X0_CTRL]
exit_l2_resume:
.endm
#else /* CONFIG_CACHE_L2X0 */
.macro l2_cache_resume, tmp1, tmp2, tmp3, phys_l2x0_saved_regs
.endm
#endif /* CONFIG_CACHE_L2X0 */
#else
void tegra_resume(void);
int tegra_sleep_cpu_finish(unsigned long);