From c5d6c7708c3e58015b2e4e13e6cea02c8567a94e Mon Sep 17 00:00:00 2001
From: Alexander Shishkin <virtuoso@slind.org>
Date: Tue, 1 Dec 2009 14:00:51 +0100
Subject: ARM: 5841/1: a driver for on-chip ETM and ETB
This driver implements support for on-chip Embedded Tracing Macrocell and
Embedded Trace Buffer. It allows to trigger tracing of kernel execution flow
and exporting trace output to userspace via character device and a sysrq
combo.
Trace output can then be decoded by a fairly simple open source tool [1]
which is already sufficient to get the idea of what the kernel is doing.
[1]: http://github.com/virtuoso/etm2human
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 | 165 ++++++++++++++++++++++++++++++
1 file changed, 165 insertions(+)
create mode 100644 arch/arm/include/asm/hardware/coresight.h
(limited to 'arch/arm/include')
diff --git a/arch/arm/include/asm/hardware/coresight.h b/arch/arm/include/asm/hardware/coresight.h
new file mode 100644
index 000000000000..f82b25d4f73e
--- /dev/null
+++ b/arch/arm/include/asm/hardware/coresight.h
@@ -0,0 +1,165 @@
+/*
+ * linux/arch/arm/include/asm/hardware/coresight.h
+ *
+ * CoreSight components' registers
+ *
+ * Copyright (C) 2009 Nokia Corporation.
+ * Alexander Shishkin
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_HARDWARE_CORESIGHT_H
+#define __ASM_HARDWARE_CORESIGHT_H
+
+#define TRACER_ACCESSED_BIT 0
+#define TRACER_RUNNING_BIT 1
+#define TRACER_CYCLE_ACC_BIT 2
+#define TRACER_ACCESSED BIT(TRACER_ACCESSED_BIT)
+#define TRACER_RUNNING BIT(TRACER_RUNNING_BIT)
+#define TRACER_CYCLE_ACC BIT(TRACER_CYCLE_ACC_BIT)
+
+struct tracectx {
+ unsigned int etb_bufsz;
+ void __iomem *etb_regs;
+ void __iomem *etm_regs;
+ unsigned long flags;
+ int ncmppairs;
+ int etm_portsz;
+ struct device *dev;
+ struct clk *emu_clk;
+ struct mutex mutex;
+};
+
+#define TRACER_TIMEOUT 10000
+
+#define etm_writel(t, v, x) \
+ (__raw_writel((v), (t)->etm_regs + (x)))
+#define etm_readl(t, x) (__raw_readl((t)->etm_regs + (x)))
+
+/* CoreSight Management Registers */
+#define CSMR_LOCKACCESS 0xfb0
+#define CSMR_LOCKSTATUS 0xfb4
+#define CSMR_AUTHSTATUS 0xfb8
+#define CSMR_DEVID 0xfc8
+#define CSMR_DEVTYPE 0xfcc
+/* CoreSight Component Registers */
+#define CSCR_CLASS 0xff4
+
+#define CSCR_PRSR 0x314
+
+#define UNLOCK_MAGIC 0xc5acce55
+
+/* ETM control register, "ETM Architecture", 3.3.1 */
+#define ETMR_CTRL 0
+#define ETMCTRL_POWERDOWN 1
+#define ETMCTRL_PROGRAM (1 << 10)
+#define ETMCTRL_PORTSEL (1 << 11)
+#define ETMCTRL_DO_CONTEXTID (3 << 14)
+#define ETMCTRL_PORTMASK1 (7 << 4)
+#define ETMCTRL_PORTMASK2 (1 << 21)
+#define ETMCTRL_PORTMASK (ETMCTRL_PORTMASK1 | ETMCTRL_PORTMASK2)
+#define ETMCTRL_PORTSIZE(x) ((((x) & 7) << 4) | (!!((x) & 8)) << 21)
+#define ETMCTRL_DO_CPRT (1 << 1)
+#define ETMCTRL_DATAMASK (3 << 2)
+#define ETMCTRL_DATA_DO_DATA (1 << 2)
+#define ETMCTRL_DATA_DO_ADDR (1 << 3)
+#define ETMCTRL_DATA_DO_BOTH (ETMCTRL_DATA_DO_DATA | ETMCTRL_DATA_DO_ADDR)
+#define ETMCTRL_BRANCH_OUTPUT (1 << 8)
+#define ETMCTRL_CYCLEACCURATE (1 << 12)
+
+/* ETM configuration code register */
+#define ETMR_CONFCODE (0x04)
+
+/* ETM trace start/stop resource control register */
+#define ETMR_TRACESSCTRL (0x18)
+
+/* ETM trigger event register */
+#define ETMR_TRIGEVT (0x08)
+
+/* address access type register bits, "ETM architecture",
+ * table 3-27 */
+/* - access type */
+#define ETMAAT_IFETCH 0
+#define ETMAAT_IEXEC 1
+#define ETMAAT_IEXECPASS 2
+#define ETMAAT_IEXECFAIL 3
+#define ETMAAT_DLOADSTORE 4
+#define ETMAAT_DLOAD 5
+#define ETMAAT_DSTORE 6
+/* - comparison access size */
+#define ETMAAT_JAVA (0 << 3)
+#define ETMAAT_THUMB (1 << 3)
+#define ETMAAT_ARM (3 << 3)
+/* - data value comparison control */
+#define ETMAAT_NOVALCMP (0 << 5)
+#define ETMAAT_VALMATCH (1 << 5)
+#define ETMAAT_VALNOMATCH (3 << 5)
+/* - exact match */
+#define ETMAAT_EXACTMATCH (1 << 7)
+/* - context id comparator control */
+#define ETMAAT_IGNCONTEXTID (0 << 8)
+#define ETMAAT_VALUE1 (1 << 8)
+#define ETMAAT_VALUE2 (2 << 8)
+#define ETMAAT_VALUE3 (3 << 8)
+/* - security level control */
+#define ETMAAT_IGNSECURITY (0 << 10)
+#define ETMAAT_NSONLY (1 << 10)
+#define ETMAAT_SONLY (2 << 10)
+
+#define ETMR_COMP_VAL(x) (0x40 + (x) * 4)
+#define ETMR_COMP_ACC_TYPE(x) (0x80 + (x) * 4)
+
+/* ETM status register, "ETM Architecture", 3.3.2 */
+#define ETMR_STATUS (0x10)
+#define ETMST_OVERFLOW (1 << 0)
+#define ETMST_PROGBIT (1 << 1)
+#define ETMST_STARTSTOP (1 << 2)
+#define ETMST_TRIGGER (1 << 3)
+
+#define etm_progbit(t) (etm_readl((t), ETMR_STATUS) & ETMST_PROGBIT)
+#define etm_started(t) (etm_readl((t), ETMR_STATUS) & ETMST_STARTSTOP)
+#define etm_triggered(t) (etm_readl((t), ETMR_STATUS) & ETMST_TRIGGER)
+
+#define ETMR_TRACEENCTRL2 0x1c
+#define ETMR_TRACEENCTRL 0x24
+#define ETMTE_INCLEXCL (1 << 24)
+#define ETMR_TRACEENEVT 0x20
+#define ETMCTRL_OPTS (ETMCTRL_DO_CPRT | \
+ ETMCTRL_DATA_DO_ADDR | \
+ ETMCTRL_BRANCH_OUTPUT | \
+ ETMCTRL_DO_CONTEXTID)
+
+/* ETB registers, "CoreSight Components TRM", 9.3 */
+#define ETBR_DEPTH 0x04
+#define ETBR_STATUS 0x0c
+#define ETBR_READMEM 0x10
+#define ETBR_READADDR 0x14
+#define ETBR_WRITEADDR 0x18
+#define ETBR_TRIGGERCOUNT 0x1c
+#define ETBR_CTRL 0x20
+#define ETBR_FORMATTERCTRL 0x304
+#define ETBFF_ENFTC 1
+#define ETBFF_ENFCONT (1 << 1)
+#define ETBFF_FONFLIN (1 << 4)
+#define ETBFF_MANUAL_FLUSH (1 << 6)
+#define ETBFF_TRIGIN (1 << 8)
+#define ETBFF_TRIGEVT (1 << 9)
+#define ETBFF_TRIGFL (1 << 10)
+
+#define etb_writel(t, v, x) \
+ (__raw_writel((v), (t)->etb_regs + (x)))
+#define etb_readl(t, x) (__raw_readl((t)->etb_regs + (x)))
+
+#define etm_lock(t) do { etm_writel((t), 0, CSMR_LOCKACCESS); } while (0)
+#define etm_unlock(t) \
+ do { etm_writel((t), UNLOCK_MAGIC, CSMR_LOCKACCESS); } while (0)
+
+#define etb_lock(t) do { etb_writel((t), 0, CSMR_LOCKACCESS); } while (0)
+#define etb_unlock(t) \
+ do { etb_writel((t), UNLOCK_MAGIC, CSMR_LOCKACCESS); } while (0)
+
+#endif /* __ASM_HARDWARE_CORESIGHT_H */
+
--
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