msm: pm: warmboot entry/exit counters on IMEM
Add warmboot entry/exit counters for each core on a non-cacheable always
on IMEM memory. This is a useful feature during debug to understand if
the system has correctly warmbooted after a power collapse. The debug
counters start at a memory offset of 0x664 on the IMEM. Each core
reserves 4 words for events, of which 3 are being used to monitor the
following events,
1) power collapse entry
2) warmboot exit
3) failed power collapse when wfi returns with a pending interrupt.
Change-Id: I45aac8e4a4d3421d586790b3b66fd71a8d88ea9d
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
diff --git a/arch/arm/mach-msm/idle-v7.S b/arch/arm/mach-msm/idle-v7.S
index f970769..1d8f313 100644
--- a/arch/arm/mach-msm/idle-v7.S
+++ b/arch/arm/mach-msm/idle-v7.S
@@ -128,6 +128,19 @@
bne skip
bl v7_flush_dcache_all
skip:
+ mrc p15, 0, r0, c0, c0, 5 /* MPIDR */
+ and r0, r0, #15 /* what CPU am I */
+
+ ldr r1, =msm_pc_debug_counters /*load the IMEM debug location */
+ ldr r1, [r1]
+ cmp r1, #0
+ beq skip_pc_debug1
+ add r1, r1, r0, LSL #4 /* debug location for this CPU */
+ ldr r2, [r1]
+ add r2, #1
+ str r2, [r1]
+skip_pc_debug1:
+
#ifdef CONFIG_ARCH_MSM_KRAIT
ldr r0, =SCM_SVC_BOOT
ldr r1, =SCM_CMD_TERMINATE_PC
@@ -155,6 +168,21 @@
#if defined(CONFIG_MSM_FIQ_SUPPORT)
cpsie f
#endif
+ mrc p15, 0, r0, c0, c0, 5 /* MPIDR */
+ and r0, r0, #15 /* what CPU am I */
+
+ ldr r1, =msm_pc_debug_counters /*load the IMEM debug location */
+ ldr r1, [r1]
+ cmp r1, #0
+ beq skip_pc_debug2
+ add r1, r1, r0, LSL #4 /* debug location for this CPU */
+ add r1, #8
+ ldr r2, [r1]
+ add r2, #1
+ str r2, [r1]
+
+skip_pc_debug2:
+
#ifdef CONFIG_MSM_JTAG
bl msm_jtag_restore_state
#endif
@@ -276,6 +304,22 @@
mrc p15, 0, r0, c0, c0, 5 /* MPIDR */
and r0, r0, #15 /* what CPU am I */
+ ldr r1, =msm_pc_debug_counters_phys /*phys addr for IMEM reg */
+ ldr r2, =msm_pm_boot_entry
+ adr r3, msm_pm_boot_entry
+ add r1, r1, r3 /* translate virt to phys addr */
+ sub r1, r1, r2
+ ldr r1,[r1]
+
+ cmp r1, #0
+ beq skip_pc_debug3
+ add r1, r1, r0, LSL #4 /* debug location for this CPU */
+ add r1, #4 /* warmboot entry counter*/
+ ldr r2, [r1]
+ add r2, #1
+ str r2, [r1]
+
+skip_pc_debug3:
ldr r1, =msm_pm_boot_vector
ldr r2, =msm_pm_boot_entry
adr r3, msm_pm_boot_entry
@@ -325,6 +369,14 @@
l2x0_base_addr:
.long 0x0
+ .globl msm_pc_debug_counters_phys
+msm_pc_debug_counters_phys:
+ .long 0x0
+
+ .globl msm_pc_debug_counters
+msm_pc_debug_counters:
+ .long 0x0
+
/*
* Default the l2 flush flag to 1 so that caches are flushed during power
* collapse unless the L2 driver decides to flush them only during L2
diff --git a/arch/arm/mach-msm/pm-8x60.c b/arch/arm/mach-msm/pm-8x60.c
index 89b8c92..5d2baa9 100644
--- a/arch/arm/mach-msm/pm-8x60.c
+++ b/arch/arm/mach-msm/pm-8x60.c
@@ -24,6 +24,7 @@
#include <linux/smp.h>
#include <linux/suspend.h>
#include <linux/tick.h>
+#include <linux/platform_device.h>
#include <mach/msm_iomap.h>
#include <mach/socinfo.h>
#include <mach/system.h>
@@ -74,7 +75,6 @@
);
static int msm_pm_retention_tz_call;
-
/******************************************************************************
* Sleep Modes and Parameters
*****************************************************************************/
@@ -548,7 +548,6 @@
#ifdef CONFIG_VFP
vfp_pm_suspend();
#endif
-
collapsed = msm_pm_l2x0_power_collapse();
msm_pm_boot_config_after_pc(cpu);
@@ -1065,6 +1064,46 @@
msm_pm_retention_tz_call = flag;
}
+static int __devinit msm_pc_debug_probe(struct platform_device *pdev)
+{
+ struct resource *res = NULL;
+ int i ;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ goto fail;
+
+ msm_pc_debug_counters_phys = res->start;
+ WARN_ON(resource_size(res) < SZ_64);
+ msm_pc_debug_counters = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+
+ if (!msm_pc_debug_counters)
+ goto fail;
+
+ for (i = 0; i < resource_size(res)/4; i++)
+ __raw_writel(0, msm_pc_debug_counters + i * 4);
+ return 0;
+fail:
+ msm_pc_debug_counters = 0;
+ msm_pc_debug_counters_phys = 0;
+ return -EFAULT;
+}
+
+static struct of_device_id msm_pc_debug_table[] = {
+ {.compatible = "qcom,pc-cntr"},
+ {},
+};
+
+static struct platform_driver msm_pc_counter_driver = {
+ .probe = msm_pc_debug_probe,
+ .driver = {
+ .name = "pc-cntr",
+ .owner = THIS_MODULE,
+ .of_match_table = msm_pc_debug_table,
+ },
+};
+
static int __init msm_pm_init(void)
{
pgd_t *pc_pgd;
@@ -1080,6 +1119,7 @@
unsigned long exit_phys;
/* Page table for cores to come back up safely. */
+
pc_pgd = pgd_alloc(&init_mm);
if (!pc_pgd)
return -ENOMEM;
@@ -1123,6 +1163,7 @@
msm_pm_target_init();
hrtimer_init(&pm_hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
msm_cpuidle_init();
+ platform_driver_register(&msm_pc_counter_driver);
return 0;
}
diff --git a/arch/arm/mach-msm/pm.h b/arch/arm/mach-msm/pm.h
index 33b806c..51256ca 100644
--- a/arch/arm/mach-msm/pm.h
+++ b/arch/arm/mach-msm/pm.h
@@ -138,5 +138,6 @@
#endif
void msm_pm_set_cpr_ops(struct msm_pm_cpr_ops *ops);
-
+extern void *msm_pc_debug_counters;
+extern unsigned long msm_pc_debug_counters_phys;
#endif /* __ARCH_ARM_MACH_MSM_PM_H */