ARM: 6292/1: coresight: add ETM management registers

Add notion of ETM OS lock, save and restore registers.

Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Alexander Shishkin <virtuoso@slind.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/hardware/coresight.h

@@ -48,8 +48,6 @@ struct tracectx {
 /* CoreSight Component Registers */
 #define CSCR_CLASS	0xff4
 
-#define CSCR_PRSR	0x314
-
 #define UNLOCK_MAGIC	0xc5acce55
 
 /* ETM control register, "ETM Architecture", 3.3.1 */
@@ -132,6 +130,12 @@ struct tracectx {
 				ETMCTRL_BRANCH_OUTPUT | \
 				ETMCTRL_DO_CONTEXTID)
 
+/* ETM management registers, "ETM Architecture", 3.5.24 */
+#define ETMMR_OSLAR	0x300
+#define ETMMR_OSLSR	0x304
+#define ETMMR_OSSRR	0x308
+#define ETMMR_PDSR	0x314
+
 /* ETB registers, "CoreSight Components TRM", 9.3 */
 #define ETBR_DEPTH		0x04
 #define ETBR_STATUS		0x0c

arch/arm/kernel/etm.c

@@ -543,7 +543,7 @@ static int __init etm_probe(struct amba_device *dev, struct amba_id *id)
 	t->etm_portsz = 1;
 
 	etm_unlock(t);
-	ret = etm_readl(t, CSCR_PRSR);
+	ret = etm_readl(t, ETMMR_PDSR);
 
 	t->ncmppairs = etm_readl(t, ETMR_CONFCODE) & 0xf;
 	etm_writel(t, 0x440, ETMR_CTRL);