> -----Original Message-----
> From: linux-omap-ow...@vger.kernel.org [mailto:linux-omap-
> ow...@vger.kernel.org] On Behalf Of virtu...@slind.org
> Sent: Thursday, October 08, 2009 3:06 AM
> To: linux-omap@vger.kernel.org
> Cc: Alexander Shishkin
> Subject: [PATCH 1/2] arm/omap3: a driver for on-chip ETM and ETB
>
> From: Alexander Shishkin <virtu...@slind.org>
>
> This driver implements /dev/tracebuf and some control files for ETM
> and ETB in sysfs.
Looks like a very useful driver for tracing/debug.
Do you have some README link on the usage of this driver ?
> Signed-off-by: Alexander Shishkin <virtu...@slind.org>
> ---
> arch/arm/Kconfig.debug | 8 +
> arch/arm/include/asm/hardware/coresight.h | 164 ++++++++
> arch/arm/kernel/Makefile | 2 +
> arch/arm/kernel/etm.c | 584
> +++++++++++++++++++++++++++++
> arch/arm/mach-omap2/Kconfig | 7 +
> arch/arm/mach-omap2/Makefile | 3 +
> arch/arm/mach-omap2/emu.c | 70 ++++
> 7 files changed, 838 insertions(+), 0 deletions(-)
> create mode 100644 arch/arm/include/asm/hardware/coresight.h
> create mode 100644 arch/arm/kernel/etm.c
> create mode 100644 arch/arm/mach-omap2/emu.c
>
> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> index 1a6f70e..ac83c03 100644
> --- a/arch/arm/Kconfig.debug
> +++ b/arch/arm/Kconfig.debug
> @@ -83,6 +83,14 @@ config DEBUG_ICEDCC
> It does include a timeout to ensure that the system does not
> totally freeze when there is nothing connected to read.
>
> +config OC_ETM
> + tristate "On-chip ETM and ETB"
> + depends on ARCH_OMAP3
> + help
> + Enables the on-chip embedded trace macrocell and embedded trace
> + buffer driver that will allow you to collect traces of the
> + kernel code.
> +
> config DEBUG_DC21285_PORT
> bool "Kernel low-level debugging messages via footbridge serial
> port"
> depends on DEBUG_LL && FOOTBRIDGE
> diff --git a/arch/arm/include/asm/hardware/coresight.h
> b/arch/arm/include/asm/hardware/coresight.h
> new file mode 100644
> index 0000000..ba22df9
> --- /dev/null
> +++ b/arch/arm/include/asm/hardware/coresight.h
> @@ -0,0 +1,164 @@
> +/*
> + * 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 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 */
> +
> diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
> index 79087dd..e7ccf7e 100644
> --- a/arch/arm/kernel/Makefile
> +++ b/arch/arm/kernel/Makefile
> @@ -17,6 +17,8 @@ obj-y := compat.o elf.o entry-armv.o entry-
> common.o irq.o \
> process.o ptrace.o return_address.o setup.o signal.o \
> sys_arm.o stacktrace.o time.o traps.o
>
> +obj-$(CONFIG_OC_ETM) += etm.o
> +
> obj-$(CONFIG_ISA_DMA_API) += dma.o
> obj-$(CONFIG_ARCH_ACORN) += ecard.o
> obj-$(CONFIG_FIQ) += fiq.o
> diff --git a/arch/arm/kernel/etm.c b/arch/arm/kernel/etm.c
> new file mode 100644
> index 0000000..fe233b0
> --- /dev/null
> +++ b/arch/arm/kernel/etm.c
> @@ -0,0 +1,584 @@
> +/*
> + * linux/arch/arm/kernel/etm.c
> + *
> + * Driver for ARM's Embedded Trace Macrocell and Embedded Trace Buffer.
> + *
> + * 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.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/types.h>
> +#include <linux/io.h>
> +#include <linux/clk.h>
> +#include <linux/sysrq.h>
> +#include <linux/platform_device.h>
> +#include <linux/fs.h>
> +#include <linux/uaccess.h>
> +#include <linux/miscdevice.h>
> +#include <linux/vmalloc.h>
> +#include <linux/mutex.h>
> +#include <asm/hardware/coresight.h>
> +#include <asm/sections.h>
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Alexander Shishkin");
> +
> +static struct tracectx tracer;
> +
> +static inline bool trace_isrunning(struct tracectx *t)
> +{
> + return !!(t->flags & TRACER_RUNNING);
> +}
> +
> +static int etm_setup_address_range(struct tracectx *t, int n,
> + unsigned long start, unsigned long end, int exclude, int data)
> +{
> + u32 flags = ETMAAT_ARM | ETMAAT_IGNCONTEXTID | ETMAAT_NSONLY | \
> + ETMAAT_NOVALCMP;
> +
> + if (n < 1 || n > t->ncmppairs)
> + return -EINVAL;
> +
> + /* comparators and ranges are numbered starting with 1 as opposed
> + * to bits in a word */
> + n--;
> +
> + if (data)
> + flags |= ETMAAT_DLOADSTORE;
> + else
> + flags |= ETMAAT_IEXEC;
> +
> + /* first comparator for the range */
> + etm_writel(t, flags, ETMR_COMP_ACC_TYPE(n * 2));
> + etm_writel(t, start, ETMR_COMP_VAL(n * 2));
> +
> + /* second comparator is right next to it */
> + etm_writel(t, flags, ETMR_COMP_ACC_TYPE(n * 2 + 1));
> + etm_writel(t, end, ETMR_COMP_VAL(n * 2 + 1));
> +
> + flags = exclude ? ETMTE_INCLEXCL : 0;
> + etm_writel(t, flags | (1 << n), ETMR_TRACEENCTRL);
> +
> + return 0;
> +}
> +
> +static int trace_start(struct tracectx *t)
> +{
> + u32 v;
> + unsigned long timeout = TRACER_TIMEOUT;
> +
> + etb_unlock(t);
> +
> + etb_writel(t, 0, ETBR_FORMATTERCTRL);
> + etb_writel(t, 1, ETBR_CTRL);
> +
> + etb_lock(t);
> +
> + /* configure etm */
> + v = ETMCTRL_OPTS | ETMCTRL_PROGRAM | ETMCTRL_PORTSIZE(t-
> >etm_portsz);
> +
> + if (t->flags & TRACER_CYCLE_ACC)
> + v |= ETMCTRL_CYCLEACCURATE;
> +
> + etm_unlock(t);
> +
> + etm_writel(t, v, ETMR_CTRL);
> +
> + while (--timeout && !(etm_readl(t, ETMR_CTRL) & ETMCTRL_PROGRAM))
> + ;
> + if (!timeout) {
> + dev_dbg(t->dev, "Waiting for progbit to assert timed out\n");
> + return -EFAULT;
> + }
> +
> + etm_setup_address_range(t, 1, (unsigned long)_stext,
> + (unsigned long)_etext, 0, 0);
> + etm_writel(t, 0, ETMR_TRACEENCTRL2);
> + etm_writel(t, 0, ETMR_TRACESSCTRL);
> + etm_writel(t, 0x6f, ETMR_TRACEENEVT);
> +
> + v &= ~ETMCTRL_PROGRAM;
> + v |= ETMCTRL_PORTSEL;
> +
> + etm_writel(t, v, ETMR_CTRL);
> +
> + timeout = TRACER_TIMEOUT;
> + while (--timeout && etm_readl(t, ETMR_CTRL) & ETMCTRL_PROGRAM)
> + ;
> + if (!timeout) {
> + dev_dbg(t->dev, "Waiting for progbit to deassert timed
> out\n");
> + return -EFAULT;
> + }
> +
> + etm_lock(t);
> +
> + t->flags |= TRACER_RUNNING;
> +
> + return 0;
> +}
> +
> +static int trace_stop(struct tracectx *t)
> +{
> + unsigned long timeout = TRACER_TIMEOUT;
> +
> + etm_unlock(t);
> +
> + etm_writel(t, 0x440, ETMR_CTRL);
> + while (--timeout && !(etm_readl(t, ETMR_CTRL) & ETMCTRL_PROGRAM))
> + ;
> + if (!timeout) {
> + dev_dbg(t->dev, "Waiting for progbit to assert timed out\n");
> + return -EFAULT;
> + }
> +
> + etm_lock(t);
> +
> + etb_unlock(t);
> + etb_writel(t, ETBFF_MANUAL_FLUSH, ETBR_FORMATTERCTRL);
> +
> + timeout = TRACER_TIMEOUT;
> + while (--timeout && etb_readl(t, ETBR_FORMATTERCTRL) &
> + ETBFF_MANUAL_FLUSH)
> + ;
> + if (!timeout) {
> + dev_dbg(t->dev, "Waiting for formatter flush to commence "
> + "timed out\n");
> + return -EFAULT;
> + }
> +
> + etb_writel(t, 0, ETBR_CTRL);
> +
> + etb_lock(t);
> +
> + t->flags &= ~TRACER_RUNNING;
> +
> + return 0;
> +}
> +
> +static int etb_getdatalen(struct tracectx *t)
> +{
> + u32 v;
> + int rp, wp;
> +
> + v = etb_readl(t, ETBR_STATUS);
> +
> + if (v & 1)
> + return t->etb_bufsz;
> +
> + rp = etb_readl(t, ETBR_READADDR);
> + wp = etb_readl(t, ETBR_WRITEADDR);
> +
> + if (rp > wp) {
> + etb_writel(t, 0, ETBR_READADDR);
> + etb_writel(t, 0, ETBR_WRITEADDR);
> +
> + return 0;
> + }
> +
> + return wp - rp;
> +}
> +
> +/* sysrq+v will always stop the running trace and leave it at that */
> +static void etm_dump(void)
> +{
> + struct tracectx *t = &tracer;
> + u32 first = 0;
> + int length;
> +
> + if (!t->etb_regs) {
> + printk(KERN_INFO "No tracing hardware found\n");
> + return;
> + }
> +
> + if (!mutex_trylock(&t->mutex))
> + return;
> +
> + if (trace_isrunning(t))
> + trace_stop(t);
> +
> + etb_unlock(t);
> +
> + length = etb_getdatalen(t);
> +
> + if (length == t->etb_bufsz)
> + first = etb_readl(t, ETBR_WRITEADDR);
> +
> + etb_writel(t, first, ETBR_READADDR);
> +
> + printk(KERN_INFO "Trace buffer contents length: %d\n", length);
> + printk(KERN_INFO "--- ETB buffer begin ---\n");
> + for (; length; length--)
> + printk("%08x", cpu_to_be32(etb_readl(t, ETBR_READMEM)));
> + printk(KERN_INFO "\n--- ETB buffer end ---\n");
> +
> + etb_writel(t, 0, ETBR_TRIGGERCOUNT);
> + etb_writel(t, 0, ETBR_READADDR);
> + etb_writel(t, 0, ETBR_WRITEADDR);
> +
> + etb_lock(t);
> +
> + mutex_unlock(&t->mutex);
> +}
> +
> +static void sysrq_etm_dump(int key, struct tty_struct *tty)
> +{
> + dev_dbg(tracer.dev, "Dumping ETB buffer\n");
> + etm_dump();
> +}
> +
> +static struct sysrq_key_op sysrq_etm_op = {
> + .handler = sysrq_etm_dump,
> + .help_msg = "ETM buffer dump",
> + .action_msg = "etm",
> +};
> +
> +static int etb_open(struct inode *inode, struct file *file)
> +{
> + if (!tracer.etb_regs)
> + return -ENODEV;
> +
> + file->private_data = &tracer;
> +
> + return nonseekable_open(inode, file);
> +}
> +
> +static ssize_t etb_read(struct file *file, char __user *data,
> + size_t len, loff_t *ppos)
> +{
> + int total, i;
> + long length;
> + struct tracectx *t = file->private_data;
> + u32 first = 0;
> + u32 *buf;
> +
> + mutex_lock(&t->mutex);
> +
> + if (trace_isrunning(t)) {
> + length = 0;
> + goto out;
> + }
> +
> + etb_unlock(t);
> +
> + total = etb_getdatalen(t);
> + if (total == t->etb_bufsz)
> + first = etb_readl(t, ETBR_WRITEADDR);
> +
> + etb_writel(t, first, ETBR_READADDR);
> +
> + length = min(total * 4, (int)len);
> + buf = vmalloc(length);
> +
> + dev_dbg(t->dev, "ETB buffer length: %d\n", total);
> + dev_dbg(t->dev, "ETB status reg: %x\n", etb_readl(t, ETBR_STATUS));
> + for (i = 0; i < length / 4; i++)
> + buf[i] = etb_readl(t, ETBR_READMEM);
> +
> + /* the only way to deassert overflow bit in ETB status is this */
> + etb_writel(t, 1, ETBR_CTRL);
> + etb_writel(t, 0, ETBR_CTRL);
> +
> + etb_writel(t, 0, ETBR_WRITEADDR);
> + etb_writel(t, 0, ETBR_READADDR);
> + etb_writel(t, 0, ETBR_TRIGGERCOUNT);
> +
> + etb_lock(t);
> +
> + length = copy_to_user(data, buf, length);
> + vfree(buf);
> +
> +out:
> + mutex_unlock(&t->mutex);
> +
> + return length;
> +}
> +
> +static int etb_release(struct inode *inode, struct file *file)
> +{
> + /* there's nothing to do here, actually */
> + return 0;
> +}
> +
> +static struct file_operations etb_fops = {
> + .owner = THIS_MODULE,
> + .read = etb_read,
> + .open = etb_open,
> + .release = etb_release,
> +};
> +
> +static struct miscdevice etb_miscdev = {
> + .name = "tracebuf",
> + .minor = 0,
> + .fops = &etb_fops,
> +};
> +
> +static int __devinit etb_drv_probe(struct platform_device *pdev)
> +{
> + struct tracectx *t = platform_get_drvdata(pdev);
> + struct resource *res;
> + struct clk *clk;
> + int ret = 0;
> +
> + if (t && t->etb_regs) {
> + dev_dbg(&pdev->dev, "ETB already initialized\n");
> + ret = -EBUSY;
> + goto out;
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + ret = -ENODEV;
> + goto out;
> + }
> +
> + if (!request_mem_region(res->start, SZ_4K, "etb")) {
> + ret = -EBUSY;
> + goto out;
> + }
> +
> + if (!t) {
> + t = &tracer;
> + platform_set_drvdata(pdev, t);
> + }
> +
> + t->etb_regs = ioremap_nocache(res->start, SZ_4K);
> + if (!t->etb_regs) {
> + ret = -ENOMEM;
> + platform_set_drvdata(pdev, NULL);
> + release_mem_region(res->start, SZ_4K);
> + goto out;
> + }
> +
> + etb_miscdev.parent = &pdev->dev;
> +
> + ret = misc_register(&etb_miscdev);
> + if (ret) {
> + platform_set_drvdata(pdev, NULL);
> + iounmap(t->etb_regs);
> + release_mem_region(res->start, SZ_4K);
> + goto out;
> + }
> +
> + clk = clk_get(&pdev->dev, "emu_core_alwon_ck");
> + clk_enable(clk);
> +
> + clk = clk_get(&pdev->dev, "emu_per_alwon_ck");
> + clk_enable(clk);
> +
> + clk = clk_get(&pdev->dev, "emu_mpu_alwon_ck");
> + clk_enable(clk);
> +
> + clk = clk_get(&pdev->dev, "emu_src_ck");
> + clk_enable(clk);
> +
> + etb_unlock(t);
> + t->etb_bufsz = etb_readl(t, ETBR_DEPTH);
> + dev_dbg(&pdev->dev, "Size: %x\n", t->etb_bufsz);
> +
> + /* make sure trace capture is disabled */
> + etb_writel(t, 0, ETBR_CTRL);
> + etb_writel(t, 0x1000, ETBR_FORMATTERCTRL);
> + etb_lock(t);
> +
> + dev_dbg(&pdev->dev, "ETB platform driver initialized.\n");
> +
> + ret = 0;
> +out:
> + return ret;
> +}
> +
> +static struct platform_driver etb_driver = {
> + .probe = etb_drv_probe,
> + .driver = {
> + .name = "etb",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +/* use a sysfs file "trace_running" to start/stop tracing */
> +static ssize_t trace_running_show(struct kobject *kobj,
> + struct kobj_attribute *attr,
> + char *buf)
> +{
> + return sprintf(buf, "%x\n", trace_isrunning(&tracer));
> +}
> +
> +static ssize_t trace_running_store(struct kobject *kobj,
> + struct kobj_attribute *attr,
> + const char *buf, size_t n)
> +{
> + unsigned int value;
> + int ret;
> +
> + if (sscanf(buf, "%u", &value) != 1)
> + return -EINVAL;
> +
> + mutex_lock(&tracer.mutex);
> + ret = value ? trace_start(&tracer) : trace_stop(&tracer);
> + mutex_unlock(&tracer.mutex);
> +
> + return ret ? : n;
> +}
> +
> +static struct kobj_attribute trace_running_attr =
> + __ATTR(trace_running, 0644, trace_running_show,
> trace_running_store);
> +
> +static ssize_t trace_info_show(struct kobject *kobj,
> + struct kobj_attribute *attr,
> + char *buf)
> +{
> + u32 etb_wa, etb_ra, etb_st, etb_fc, etm_ctrl, etm_st;
> + int datalen;
> +
> + etb_unlock(&tracer);
> + datalen = etb_getdatalen(&tracer);
> + etb_wa = etb_readl(&tracer, ETBR_WRITEADDR);
> + etb_ra = etb_readl(&tracer, ETBR_READADDR);
> + etb_st = etb_readl(&tracer, ETBR_STATUS);
> + etb_fc = etb_readl(&tracer, ETBR_FORMATTERCTRL);
> + etb_lock(&tracer);
> +
> + etm_unlock(&tracer);
> + etm_ctrl = etm_readl(&tracer, ETMR_CTRL);
> + etm_st = etm_readl(&tracer, ETMR_STATUS);
> + etm_lock(&tracer);
> +
> + return sprintf(buf, "Trace buffer len: %d\nComparator pairs: %d\n"
> + "ETBR_WRITEADDR:\t%08x\n"
> + "ETBR_READADDR:\t%08x\n"
> + "ETBR_STATUS:\t%08x\n"
> + "ETBR_FORMATTERCTRL:\t%08x\n"
> + "ETMR_CTRL:\t%08x\n"
> + "ETMR_STATUS:\t%08x\n",
> + datalen,
> + tracer.ncmppairs,
> + etb_wa,
> + etb_ra,
> + etb_st,
> + etb_fc,
> + etm_ctrl,
> + etm_st
> + );
> +}
> +
> +static struct kobj_attribute trace_info_attr =
> + __ATTR(trace_info, 0444, trace_info_show, NULL);
> +
> +static ssize_t trace_mode_show(struct kobject *kobj,
> + struct kobj_attribute *attr,
> + char *buf)
> +{
> + return sprintf(buf, "%d %d\n",
> + !!(tracer.flags & TRACER_CYCLE_ACC),
> + tracer.etm_portsz);
> +}
> +
> +static ssize_t trace_mode_store(struct kobject *kobj,
> + struct kobj_attribute *attr,
> + const char *buf, size_t n)
> +{
> + unsigned int cycacc, portsz;
> +
> + if (sscanf(buf, "%u %u", &cycacc, &portsz) != 2)
> + return -EINVAL;
> +
> + mutex_lock(&tracer.mutex);
> + if (cycacc)
> + tracer.flags |= TRACER_CYCLE_ACC;
> + else
> + tracer.flags &= ~TRACER_CYCLE_ACC;
> +
> + tracer.etm_portsz = portsz & 0x0f;
> + mutex_unlock(&tracer.mutex);
> +
> + return n;
> +}
> +
> +static struct kobj_attribute trace_mode_attr =
> + __ATTR(trace_mode, 0644, trace_mode_show, trace_mode_store);
> +
> +static int __devinit etm_drv_probe(struct platform_device *pdev)
> +{
> + struct tracectx *t = platform_get_drvdata(pdev);
> + struct resource *res;
> + int ret = 0;
> +
> + if (t && t->etm_regs) {
> + dev_dbg(&pdev->dev, "ETM already initialized\n");
> + ret = -EBUSY;
> + goto out;
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + ret = -ENODEV;
> + goto out;
> + }
> +
> + if (!request_mem_region(res->start, SZ_4K, "etm")) {
> + ret = -EBUSY;
> + goto out;
> + }
> +
> + if (!t) {
> + t = &tracer;
> + platform_set_drvdata(pdev, t);
> + }
> +
> + t->etm_regs = ioremap_nocache(res->start, SZ_4K);
> + if (!t->etm_regs) {
> + ret = -ENOMEM;
> + release_mem_region(res->start, SZ_4K);
> + platform_set_drvdata(pdev, NULL);
> + goto out;
> + }
> +
> + mutex_init(&t->mutex);
> + t->dev = &pdev->dev;
> + t->flags = TRACER_CYCLE_ACC;
> + t->etm_portsz = 1;
> +
> + etm_unlock(t);
> + ret = etm_readl(t, CSCR_PRSR);
> +
> + t->ncmppairs = etm_readl(t, ETMR_CONFCODE) & 0xf;
> + etm_writel(t, 0x440, ETMR_CTRL);
> + etm_lock(t);
> +
> + ret = sysfs_create_file(&pdev->dev.kobj,
> + &trace_running_attr.attr);
> + ret = sysfs_create_file(&pdev->dev.kobj,
> + &trace_info_attr.attr);
> + ret = sysfs_create_file(&pdev->dev.kobj,
> + &trace_mode_attr.attr);
> + dev_dbg(t->dev, "ETM platform driver initialized.\n");
> +
> +out:
> + return ret;
> +}
> +
> +static struct platform_driver etm_driver = {
> + .probe = etm_drv_probe,
> + .driver = {
> + .name = "etm",
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +static int __init etm_init(void)
> +{
> + platform_driver_register(&etb_driver);
> + platform_driver_register(&etm_driver);
> + register_sysrq_key('v', &sysrq_etm_op);
> +
> + return 0;
> +}
> +
> +module_init(etm_init);
> +
> diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig
> index 75b1c7e..87bcc2a 100644
> --- a/arch/arm/mach-omap2/Kconfig
> +++ b/arch/arm/mach-omap2/Kconfig
> @@ -88,3 +88,10 @@ config MACH_OMAP_ZOOM2
> config MACH_OMAP_4430SDP
> bool "OMAP 4430 SDP board"
> depends on ARCH_OMAP4
> +
> +config OMAP3_EMU
> + tristate "OMAP3 debugging peripherals"
> + depends on ARCH_OMAP3 && OC_ETM
> + help
> + Say Y here to enable debugging hardware of omap3
> +
> diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
> index 6b7702f..572dd27 100644
> --- a/arch/arm/mach-omap2/Makefile
> +++ b/arch/arm/mach-omap2/Makefile
> @@ -44,6 +44,9 @@ obj-$(CONFIG_ARCH_OMAP4) += cm4xxx.o
> obj-$(CONFIG_ARCH_OMAP2) += clock24xx.o
> obj-$(CONFIG_ARCH_OMAP3) += clock34xx.o
>
> +# EMU periferals
> +obj-$(CONFIG_OMAP3_EMU) += emu.o
> +
> iommu-y += iommu2.o
> iommu-$(CONFIG_ARCH_OMAP3) += omap3-iommu.o
>
> diff --git a/arch/arm/mach-omap2/emu.c b/arch/arm/mach-omap2/emu.c
> new file mode 100644
> index 0000000..f98874e
> --- /dev/null
> +++ b/arch/arm/mach-omap2/emu.c
> @@ -0,0 +1,70 @@
> +/*
> + * linux/arch/arm/mach-omap2/emu.c
> + *
> + * ETM and ETB CoreSight components' resources as found in OMAP3xxx.
> + *
> + * 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.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/init.h>
> +#include <linux/types.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Alexander Shishkin");
> +
> +/* Cortex CoreSight components within omap3xxx EMU */
> +#define ETM_BASE (L4_EMU_34XX_PHYS + 0x10000)
> +#define DBG_BASE (L4_EMU_34XX_PHYS + 0x11000)
> +#define ETB_BASE (L4_EMU_34XX_PHYS + 0x1b000)
> +#define DAPCTL (L4_EMU_34XX_PHYS + 0x1d000)
> +
> +static struct resource rx51_etb_resource = {
> + .start = ETB_BASE,
> + .end = ETB_BASE + SZ_4K,
> + .flags = IORESOURCE_MEM,
> +};
> +
> +static struct platform_device rx51_etb_device = {
> + .name = "etb",
> + .id = -1,
> + .num_resources = 1,
> + .resource = &rx51_etb_resource,
> +};
> +
> +static struct resource rx51_etm_resource = {
> + .start = ETM_BASE,
> + .end = ETM_BASE + SZ_4K,
> + .flags = IORESOURCE_MEM,
> +};
> +
> +static struct platform_device rx51_etm_device = {
> + .name = "etm",
> + .id = -1,
> + .num_resources = 1,
> + .resource = &rx51_etm_resource,
> +};
> +
> +static struct platform_device *rx51_trace_devices[] = {
> + &rx51_etm_device,
> + &rx51_etb_device,
> +};
> +
> +static int __init emu_init(void)
> +{
> + platform_add_devices(rx51_trace_devices,
> + ARRAY_SIZE(rx51_trace_devices));
> +
> + return 0;
> +}
> +
> +module_init(emu_init);
> +
> --
> 1.6.3.3
>
> --
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