diff options
| author | Arve Hjønnevåg <arve@android.com> | 2012-04-02 20:18:56 -0700 |
|---|---|---|
| committer | Colin Cross <ccross@android.com> | 2014-03-19 13:08:47 -0700 |
| commit | db5250f772ffc49f3d0ca3a747d3755c936207b6 (patch) | |
| tree | a847c7b674f4d8d36854811c01ff8e325e6d3cb8 /arch/arm | |
| parent | 2141cd4c03f1c9289e1f3e937ef60d0d2f3fae6c (diff) | |
ARM: etm: Check arch version and disable data tracing for ptm
Change-Id: If2cb7928d0711f48348443d882a12416be9c5910
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/include/asm/hardware/coresight.h | 5 | ||||
| -rw-r--r-- | arch/arm/kernel/etm.c | 23 |
2 files changed, 23 insertions, 5 deletions
diff --git a/arch/arm/include/asm/hardware/coresight.h b/arch/arm/include/asm/hardware/coresight.h index 8f8ae583358..12b894ce55f 100644 --- a/arch/arm/include/asm/hardware/coresight.h +++ b/arch/arm/include/asm/hardware/coresight.h @@ -60,6 +60,7 @@ /* ETM configuration code register */ #define ETMR_CONFCODE (0x04) +#define ETMCCR_ETMIDR_PRESENT BIT(31) /* ETM trace start/stop resource control register */ #define ETMR_TRACESSCTRL (0x18) @@ -126,6 +127,10 @@ ETMCTRL_BRANCH_OUTPUT | \ ETMCTRL_DO_CONTEXTID) +#define ETMR_ID 0x1e4 +#define ETMIDR_VERSION(x) (((x) >> 4) & 0xff) +#define ETMIDR_VERSION_PFT_1_0 0x30 + #define ETMR_TRACEIDR 0x200 /* ETM management registers, "ETM Architecture", 3.5.24 */ diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c index c1590244cb7..7eb59c48857 100644 --- a/arch/arm/kernel/etm.c +++ b/arch/arm/kernel/etm.c @@ -721,6 +721,9 @@ static int etm_probe(struct amba_device *dev, const struct amba_id *id) int ret = 0; void __iomem **new_regs; int new_count; + u32 etmccr; + u32 etmidr; + u8 etm_version = 0; mutex_lock(&t->mutex); new_count = t->etm_regs_count + 1; @@ -755,7 +758,12 @@ static int etm_probe(struct amba_device *dev, const struct amba_id *id) /* dummy first read */ (void)etm_readl(&tracer, t->etm_regs_count, ETMMR_OSSRR); - t->ncmppairs = etm_readl(t, t->etm_regs_count, ETMR_CONFCODE) & 0xf; + etmccr = etm_readl(t, t->etm_regs_count, ETMR_CONFCODE); + t->ncmppairs = etmccr & 0xf; + if (etmccr & ETMCCR_ETMIDR_PRESENT) { + etmidr = etm_readl(t, t->etm_regs_count, ETMR_ID); + etm_version = ETMIDR_VERSION(etmidr); + } etm_writel(t, t->etm_regs_count, 0x441, ETMR_CTRL); etm_writel(t, t->etm_regs_count, new_count, ETMR_TRACEIDR); etm_lock(t, t->etm_regs_count); @@ -778,10 +786,15 @@ static int etm_probe(struct amba_device *dev, const struct amba_id *id) if (ret) dev_dbg(&dev->dev, "Failed to create trace_range in sysfs\n"); - ret = sysfs_create_file(&dev->dev.kobj, &trace_data_range_attr.attr); - if (ret) - dev_dbg(&dev->dev, - "Failed to create trace_data_range in sysfs\n"); + if (etm_version < ETMIDR_VERSION_PFT_1_0) { + ret = sysfs_create_file(&dev->dev.kobj, + &trace_data_range_attr.attr); + if (ret) + dev_dbg(&dev->dev, + "Failed to create trace_data_range in sysfs\n"); + } else { + tracer.flags &= ~TRACER_TRACE_DATA; + } dev_dbg(&dev->dev, "ETM AMBA driver initialized.\n"); |