From: Arve Hjønnevåg <arve@android.com>
Date: Tue, 3 Apr 2012 03:18:56 +0000 (-0700)
Subject: ARM: etm: Check arch version and disable data tracing for ptm
X-Git-Tag: v3.0.35-fsl~432
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=04ece4be7a903a6dcde6abadcbe5846d2e652325;p=karo-tx-linux.git

ARM: etm: Check arch version and disable data tracing for ptm

Change-Id: If2cb7928d0711f48348443d882a12416be9c5910
Signed-off-by: Arve Hjønnevåg <arve@android.com>
---

diff --git a/arch/arm/include/asm/hardware/coresight.h b/arch/arm/include/asm/hardware/coresight.h
index 6643d6c4f35e..0fad8f8aed7d 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 845287bd4ba2..9cdbb6d2a4e1 100644
--- a/arch/arm/kernel/etm.c
+++ b/arch/arm/kernel/etm.c
@@ -723,6 +723,9 @@ static int __devinit 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;
@@ -757,7 +760,12 @@ static int __devinit 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);
@@ -780,10 +788,15 @@ static int __devinit 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");