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Message-Id: <1401457391-12242-3-git-send-email-mathieu.poirier@linaro.org>
Date: Fri, 30 May 2014 07:43:02 -0600
From: mathieu.poirier@...aro.org
To: linus.walleij@...aro.org, will.deacon@....com
Cc: mathieu.poirier@...aro.org, arve@...roid.com,
john.stultz@...aro.org, pratikp@...eaurora.org, varshney@...com,
Al.Grant@....com, jonas.svennebring@...gotech.com,
james.king@...aro.org, panchaxari.prasannamurthy@...aro.org,
arnd@...aro.org, marcin.jabrzyk@...il.com, r.sengupta@...sung.com,
robbelibobban@...il.com, patches@...aro.org,
linux@....linux.org.uk, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, daniel.thompson@...aro.org
Subject: [RFC PATCH 02/11] coresight: add CoreSight TMC driver
From: Pratik Patel <pratikp@...eaurora.org>
This driver manages CoreSight TMC (Trace Memory Controller) which
can act as a link or a sink depending upon its configuration. It
can present itself as an ETF (Embedded Trace FIFO) or ETR
(Embedded Trace Router).
ETF when configured in circular buffer mode acts as a trace
collection sink. When configured in HW fifo mode it acts as link.
ETR always acts as a sink and can be used to route data to memory
allocated in RAM.
Signed-off-by: Pratik Patel <pratikp@...eaurora.org>
Signed-off-by: Panchaxari Prasannamurthy <panchaxari.prasannamurthy@...aro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
drivers/coresight/Kconfig | 11 +
drivers/coresight/Makefile | 1 +
drivers/coresight/coresight-tmc.c | 796 ++++++++++++++++++++++++++++++++++++++
3 files changed, 808 insertions(+)
create mode 100644 drivers/coresight/coresight-tmc.c
diff --git a/drivers/coresight/Kconfig b/drivers/coresight/Kconfig
index 88fd44a..224903b 100644
--- a/drivers/coresight/Kconfig
+++ b/drivers/coresight/Kconfig
@@ -7,3 +7,14 @@ menuconfig CORESIGHT
the right series of components on user input via sysfs. It also
provides status information to user space applications through
the debugfs interface.
+
+if CORESIGHT
+
+config CORESIGHT_LINKS_AND_SINKS
+ bool "CoreSight Link and Sink drivers"
+ help
+ This enables support for CoreSight link and sink drivers that are
+ responsible for transporting and collecting the trace data
+ respectively.
+
+endif
diff --git a/drivers/coresight/Makefile b/drivers/coresight/Makefile
index 218e3b5..16e26c5 100644
--- a/drivers/coresight/Makefile
+++ b/drivers/coresight/Makefile
@@ -3,3 +3,4 @@
#
obj-$(CONFIG_CORESIGHT) += coresight.o
obj-$(CONFIG_OF) += of_coresight.o
+obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-tmc.o
diff --git a/drivers/coresight/coresight-tmc.c b/drivers/coresight/coresight-tmc.c
new file mode 100644
index 0000000..afcab7c
--- /dev/null
+++ b/drivers/coresight/coresight-tmc.c
@@ -0,0 +1,796 @@
+/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/uaccess.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_coresight.h>
+#include <linux/coresight.h>
+
+#include "coresight-priv.h"
+
+#define tmc_writel(drvdata, val, off) __raw_writel((val), drvdata->base + off)
+#define tmc_readl(drvdata, off) __raw_readl(drvdata->base + off)
+
+#define TMC_LOCK(drvdata) \
+do { \
+ /* settle everything first */ \
+ mb(); \
+ tmc_writel(drvdata, 0x0, CORESIGHT_LAR); \
+} while (0)
+#define TMC_UNLOCK(drvdata) \
+do { \
+ tmc_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \
+ /* make sure everyone sees this */ \
+ mb(); \
+} while (0)
+
+#define TMC_RSZ (0x004)
+#define TMC_STS (0x00C)
+#define TMC_RRD (0x010)
+#define TMC_RRP (0x014)
+#define TMC_RWP (0x018)
+#define TMC_TRG (0x01C)
+#define TMC_CTL (0x020)
+#define TMC_RWD (0x024)
+#define TMC_MODE (0x028)
+#define TMC_LBUFLEVEL (0x02C)
+#define TMC_CBUFLEVEL (0x030)
+#define TMC_BUFWM (0x034)
+#define TMC_RRPHI (0x038)
+#define TMC_RWPHI (0x03C)
+#define TMC_AXICTL (0x110)
+#define TMC_DBALO (0x118)
+#define TMC_DBAHI (0x11C)
+#define TMC_FFSR (0x300)
+#define TMC_FFCR (0x304)
+#define TMC_PSCR (0x308)
+#define TMC_ITMISCOP0 (0xEE0)
+#define TMC_ITTRFLIN (0xEE8)
+#define TMC_ITATBDATA0 (0xEEC)
+#define TMC_ITATBCTR2 (0xEF0)
+#define TMC_ITATBCTR1 (0xEF4)
+#define TMC_ITATBCTR0 (0xEF8)
+
+#define BYTES_PER_WORD 4
+
+enum tmc_config_type {
+ TMC_CONFIG_TYPE_ETB,
+ TMC_CONFIG_TYPE_ETR,
+ TMC_CONFIG_TYPE_ETF,
+};
+
+enum tmc_mode {
+ TMC_MODE_CIRCULAR_BUFFER,
+ TMC_MODE_SOFTWARE_FIFO,
+ TMC_MODE_HARDWARE_FIFO,
+};
+
+enum tmc_mem_intf_width {
+ TMC_MEM_INTF_WIDTH_32BITS = 0x2,
+ TMC_MEM_INTF_WIDTH_64BITS = 0x3,
+ TMC_MEM_INTF_WIDTH_128BITS = 0x4,
+ TMC_MEM_INTF_WIDTH_256BITS = 0x5,
+};
+
+struct tmc_drvdata {
+ void __iomem *base;
+ struct device *dev;
+ struct coresight_device *csdev;
+ struct miscdevice miscdev;
+ struct clk *clk;
+ spinlock_t spinlock;
+ int read_count;
+ bool reading;
+ char *buf;
+ dma_addr_t paddr;
+ void __iomem *vaddr;
+ uint32_t size;
+ bool enable;
+ enum tmc_config_type config_type;
+ uint32_t trigger_cntr;
+};
+
+static void tmc_wait_for_ready(struct tmc_drvdata *drvdata)
+{
+ int count;
+
+ /* Ensure formatter, unformatter and hardware fifo are empty */
+ for (count = TIMEOUT_US; BVAL(tmc_readl(drvdata, TMC_STS), 2) != 1
+ && count > 0; count--)
+ udelay(1);
+ WARN(count == 0, "timeout while waiting for TMC ready, TMC_STS: %#x\n",
+ tmc_readl(drvdata, TMC_STS));
+}
+
+static void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
+{
+ int count;
+ uint32_t ffcr;
+
+ ffcr = tmc_readl(drvdata, TMC_FFCR);
+ ffcr |= BIT(12);
+ tmc_writel(drvdata, ffcr, TMC_FFCR);
+ ffcr |= BIT(6);
+ tmc_writel(drvdata, ffcr, TMC_FFCR);
+ /* Ensure flush completes */
+ for (count = TIMEOUT_US; BVAL(tmc_readl(drvdata, TMC_FFCR), 6) != 0
+ && count > 0; count--)
+ udelay(1);
+ WARN(count == 0, "timeout while flushing TMC, TMC_FFCR: %#x\n",
+ tmc_readl(drvdata, TMC_FFCR));
+
+ tmc_wait_for_ready(drvdata);
+}
+
+static void __tmc_enable(struct tmc_drvdata *drvdata)
+{
+ tmc_writel(drvdata, 0x1, TMC_CTL);
+}
+
+static void __tmc_disable(struct tmc_drvdata *drvdata)
+{
+ tmc_writel(drvdata, 0x0, TMC_CTL);
+}
+
+static void __tmc_etb_enable(struct tmc_drvdata *drvdata)
+{
+ /* Zero out the memory to help with debug */
+ memset(drvdata->buf, 0, drvdata->size);
+
+ TMC_UNLOCK(drvdata);
+
+ tmc_writel(drvdata, TMC_MODE_CIRCULAR_BUFFER, TMC_MODE);
+ tmc_writel(drvdata, 0x133, TMC_FFCR);
+ tmc_writel(drvdata, drvdata->trigger_cntr, TMC_TRG);
+ __tmc_enable(drvdata);
+
+ TMC_LOCK(drvdata);
+}
+
+static void __tmc_etr_enable(struct tmc_drvdata *drvdata)
+{
+ uint32_t axictl;
+
+ /* Zero out the memory to help with debug */
+ memset(drvdata->vaddr, 0, drvdata->size);
+
+ TMC_UNLOCK(drvdata);
+
+ tmc_writel(drvdata, drvdata->size / BYTES_PER_WORD, TMC_RSZ);
+ tmc_writel(drvdata, TMC_MODE_CIRCULAR_BUFFER, TMC_MODE);
+
+ axictl = tmc_readl(drvdata, TMC_AXICTL);
+ axictl |= (0xF << 8);
+ tmc_writel(drvdata, axictl, TMC_AXICTL);
+ axictl &= ~(0x1 << 7);
+ tmc_writel(drvdata, axictl, TMC_AXICTL);
+ axictl = (axictl & ~0x3) | 0x2;
+ tmc_writel(drvdata, axictl, TMC_AXICTL);
+
+ tmc_writel(drvdata, drvdata->paddr, TMC_DBALO);
+ tmc_writel(drvdata, 0x0, TMC_DBAHI);
+ tmc_writel(drvdata, 0x133, TMC_FFCR);
+ tmc_writel(drvdata, drvdata->trigger_cntr, TMC_TRG);
+ __tmc_enable(drvdata);
+
+ TMC_LOCK(drvdata);
+}
+
+static void __tmc_etf_enable(struct tmc_drvdata *drvdata)
+{
+ TMC_UNLOCK(drvdata);
+
+ tmc_writel(drvdata, TMC_MODE_HARDWARE_FIFO, TMC_MODE);
+ tmc_writel(drvdata, 0x3, TMC_FFCR);
+ tmc_writel(drvdata, 0x0, TMC_BUFWM);
+ __tmc_enable(drvdata);
+
+ TMC_LOCK(drvdata);
+}
+
+static int tmc_enable(struct tmc_drvdata *drvdata, enum tmc_mode mode)
+{
+ int ret;
+ unsigned long flags;
+
+ ret = clk_prepare_enable(drvdata->clk);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+ if (drvdata->reading) {
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ clk_disable_unprepare(drvdata->clk);
+ return -EBUSY;
+ }
+
+ if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
+ __tmc_etb_enable(drvdata);
+ } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
+ __tmc_etr_enable(drvdata);
+ } else {
+ if (mode == TMC_MODE_CIRCULAR_BUFFER)
+ __tmc_etb_enable(drvdata);
+ else
+ __tmc_etf_enable(drvdata);
+ }
+ drvdata->enable = true;
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+
+ dev_info(drvdata->dev, "TMC enabled\n");
+ return 0;
+}
+
+static int tmc_enable_sink(struct coresight_device *csdev)
+{
+ struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ return tmc_enable(drvdata, TMC_MODE_CIRCULAR_BUFFER);
+}
+
+static int tmc_enable_link(struct coresight_device *csdev, int inport,
+ int outport)
+{
+ struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ return tmc_enable(drvdata, TMC_MODE_HARDWARE_FIFO);
+}
+
+static void __tmc_etb_dump(struct tmc_drvdata *drvdata)
+{
+ enum tmc_mem_intf_width memwidth;
+ uint8_t memwords;
+ char *bufp;
+ uint32_t read_data;
+ int i;
+
+ memwidth = BMVAL(tmc_readl(drvdata, CORESIGHT_DEVID), 8, 10);
+ if (memwidth == TMC_MEM_INTF_WIDTH_32BITS)
+ memwords = 1;
+ else if (memwidth == TMC_MEM_INTF_WIDTH_64BITS)
+ memwords = 2;
+ else if (memwidth == TMC_MEM_INTF_WIDTH_128BITS)
+ memwords = 4;
+ else
+ memwords = 8;
+
+ bufp = drvdata->buf;
+ while (1) {
+ for (i = 0; i < memwords; i++) {
+ read_data = tmc_readl(drvdata, TMC_RRD);
+ if (read_data == 0xFFFFFFFF)
+ return;
+ memcpy(bufp, &read_data, BYTES_PER_WORD);
+ bufp += BYTES_PER_WORD;
+ }
+ }
+}
+
+static void __tmc_etb_disable(struct tmc_drvdata *drvdata)
+{
+ TMC_UNLOCK(drvdata);
+
+ tmc_flush_and_stop(drvdata);
+ __tmc_etb_dump(drvdata);
+ __tmc_disable(drvdata);
+
+ TMC_LOCK(drvdata);
+}
+
+static void __tmc_etr_dump(struct tmc_drvdata *drvdata)
+{
+ uint32_t rwp, rwphi;
+
+ rwp = tmc_readl(drvdata, TMC_RWP);
+ rwphi = tmc_readl(drvdata, TMC_RWPHI);
+
+ if (BVAL(tmc_readl(drvdata, TMC_STS), 0))
+ drvdata->buf = drvdata->vaddr + rwp - drvdata->paddr;
+ else
+ drvdata->buf = drvdata->vaddr;
+}
+
+static void __tmc_etr_disable(struct tmc_drvdata *drvdata)
+{
+ TMC_UNLOCK(drvdata);
+
+ tmc_flush_and_stop(drvdata);
+ __tmc_etr_dump(drvdata);
+ __tmc_disable(drvdata);
+
+ TMC_LOCK(drvdata);
+}
+
+static void __tmc_etf_disable(struct tmc_drvdata *drvdata)
+{
+ TMC_UNLOCK(drvdata);
+
+ tmc_flush_and_stop(drvdata);
+ __tmc_disable(drvdata);
+
+ TMC_LOCK(drvdata);
+}
+
+static void tmc_disable(struct tmc_drvdata *drvdata, enum tmc_mode mode)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+ if (drvdata->reading)
+ goto out;
+
+ if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
+ __tmc_etb_disable(drvdata);
+ } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
+ __tmc_etr_disable(drvdata);
+ } else {
+ if (mode == TMC_MODE_CIRCULAR_BUFFER)
+ __tmc_etb_disable(drvdata);
+ else
+ __tmc_etf_disable(drvdata);
+ }
+out:
+ drvdata->enable = false;
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+
+ clk_disable_unprepare(drvdata->clk);
+
+ dev_info(drvdata->dev, "TMC disabled\n");
+}
+
+static void tmc_disable_sink(struct coresight_device *csdev)
+{
+ struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ tmc_disable(drvdata, TMC_MODE_CIRCULAR_BUFFER);
+}
+
+static void tmc_disable_link(struct coresight_device *csdev, int inport,
+ int outport)
+{
+ struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ tmc_disable(drvdata, TMC_MODE_HARDWARE_FIFO);
+}
+
+static void tmc_abort(struct coresight_device *csdev)
+{
+ struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+ unsigned long flags;
+ enum tmc_mode mode;
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+ if (drvdata->reading)
+ goto out0;
+
+ if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
+ __tmc_etb_disable(drvdata);
+ } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
+ __tmc_etr_disable(drvdata);
+ } else {
+ mode = tmc_readl(drvdata, TMC_MODE);
+ if (mode == TMC_MODE_CIRCULAR_BUFFER)
+ __tmc_etb_disable(drvdata);
+ else
+ goto out1;
+ }
+out0:
+ drvdata->enable = false;
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+
+ dev_info(drvdata->dev, "TMC aborted\n");
+ return;
+out1:
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+}
+
+static const struct coresight_ops_sink tmc_sink_ops = {
+ .enable = tmc_enable_sink,
+ .disable = tmc_disable_sink,
+ .abort = tmc_abort,
+};
+
+static const struct coresight_ops_link tmc_link_ops = {
+ .enable = tmc_enable_link,
+ .disable = tmc_disable_link,
+};
+
+static const struct coresight_ops tmc_etb_cs_ops = {
+ .sink_ops = &tmc_sink_ops,
+};
+
+static const struct coresight_ops tmc_etr_cs_ops = {
+ .sink_ops = &tmc_sink_ops,
+};
+
+static const struct coresight_ops tmc_etf_cs_ops = {
+ .sink_ops = &tmc_sink_ops,
+ .link_ops = &tmc_link_ops,
+};
+
+static int tmc_read_prepare(struct tmc_drvdata *drvdata)
+{
+ int ret;
+ unsigned long flags;
+ enum tmc_mode mode;
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+ if (!drvdata->enable)
+ goto out;
+
+ if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
+ __tmc_etb_disable(drvdata);
+ } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
+ __tmc_etr_disable(drvdata);
+ } else {
+ mode = tmc_readl(drvdata, TMC_MODE);
+ if (mode == TMC_MODE_CIRCULAR_BUFFER) {
+ __tmc_etb_disable(drvdata);
+ } else {
+ ret = -ENODEV;
+ goto err;
+ }
+ }
+out:
+ drvdata->reading = true;
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+
+ dev_info(drvdata->dev, "TMC read start\n");
+ return 0;
+err:
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+ return ret;
+}
+
+static void tmc_read_unprepare(struct tmc_drvdata *drvdata)
+{
+ unsigned long flags;
+ enum tmc_mode mode;
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+ if (!drvdata->enable)
+ goto out;
+
+ if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
+ __tmc_etb_enable(drvdata);
+ } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
+ __tmc_etr_enable(drvdata);
+ } else {
+ mode = tmc_readl(drvdata, TMC_MODE);
+ if (mode == TMC_MODE_CIRCULAR_BUFFER)
+ __tmc_etb_enable(drvdata);
+ }
+out:
+ drvdata->reading = false;
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
+
+ dev_info(drvdata->dev, "TMC read end\n");
+}
+
+static int tmc_open(struct inode *inode, struct file *file)
+{
+ struct tmc_drvdata *drvdata = container_of(file->private_data,
+ struct tmc_drvdata, miscdev);
+ int ret = 0;
+
+ if (drvdata->read_count++)
+ goto out;
+
+ ret = tmc_read_prepare(drvdata);
+ if (ret)
+ return ret;
+out:
+ nonseekable_open(inode, file);
+
+ dev_dbg(drvdata->dev, "%s: successfully opened\n", __func__);
+ return 0;
+}
+
+static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
+ loff_t *ppos)
+{
+ struct tmc_drvdata *drvdata = container_of(file->private_data,
+ struct tmc_drvdata, miscdev);
+ char *bufp = drvdata->buf + *ppos;
+
+ if (*ppos + len > drvdata->size)
+ len = drvdata->size - *ppos;
+
+ if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
+ if (bufp == (char *)(drvdata->vaddr + drvdata->size))
+ bufp = drvdata->vaddr;
+ else if (bufp > (char *)(drvdata->vaddr + drvdata->size))
+ bufp -= drvdata->size;
+ if ((bufp + len) > (char *)(drvdata->vaddr + drvdata->size))
+ len = (char *)(drvdata->vaddr + drvdata->size) - bufp;
+ }
+
+ if (copy_to_user(data, bufp, len)) {
+ dev_dbg(drvdata->dev, "%s: copy_to_user failed\n", __func__);
+ return -EFAULT;
+ }
+
+ *ppos += len;
+
+ dev_dbg(drvdata->dev, "%s: %d bytes copied, %d bytes left\n",
+ __func__, len, (int) (drvdata->size - *ppos));
+ return len;
+}
+
+static int tmc_release(struct inode *inode, struct file *file)
+{
+ struct tmc_drvdata *drvdata = container_of(file->private_data,
+ struct tmc_drvdata, miscdev);
+
+ if (--drvdata->read_count) {
+ if (drvdata->read_count < 0) {
+ WARN_ONCE(1, "mismatched close\n");
+ drvdata->read_count = 0;
+ }
+ goto out;
+ }
+
+ tmc_read_unprepare(drvdata);
+out:
+ dev_dbg(drvdata->dev, "%s: released\n", __func__);
+ return 0;
+}
+
+static const struct file_operations tmc_fops = {
+ .owner = THIS_MODULE,
+ .open = tmc_open,
+ .read = tmc_read,
+ .release = tmc_release,
+ .llseek = no_llseek,
+};
+
+static ssize_t debugfs_trigger_cntr_read(struct file *file,
+ char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ ssize_t ret;
+ struct tmc_drvdata *drvdata = file->private_data;
+ unsigned long val = drvdata->trigger_cntr;
+ char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+
+ ret = scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+ return simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+}
+
+static ssize_t debugfs_trigger_cntr_write(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long val;
+ struct tmc_drvdata *drvdata = file->private_data;
+
+ if (sscanf(user_buf, "%lx", &val) != 1)
+ return -EINVAL;
+
+ drvdata->trigger_cntr = val;
+ return count;
+}
+
+static const struct file_operations debugfs_trigger_cntr_ops = {
+ .open = simple_open,
+ .read = debugfs_trigger_cntr_read,
+ .write = debugfs_trigger_cntr_write,
+};
+
+static const struct coresight_ops_entry debugfs_trigger_cntr_entry = {
+ .name = "trigger_cntr",
+ .mode = S_IRUGO | S_IWUSR,
+ .ops = &debugfs_trigger_cntr_ops,
+};
+
+static const struct coresight_ops_entry *tmc_etb_attr_grps[] = {
+ &debugfs_trigger_cntr_entry,
+ NULL,
+};
+
+static const struct coresight_ops_entry *tmc_etr_attr_grps[] = {
+ &debugfs_trigger_cntr_entry,
+ NULL,
+};
+
+static const struct coresight_ops_entry *tmc_etf_attr_grps[] = {
+ &debugfs_trigger_cntr_entry,
+ NULL,
+};
+
+static int tmc_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ uint32_t devid;
+ struct device *dev = &pdev->dev;
+ struct coresight_platform_data *pdata = NULL;
+ struct tmc_drvdata *drvdata;
+ struct resource *res;
+ struct coresight_desc *desc;
+
+ if (pdev->dev.of_node) {
+ pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ pdev->dev.platform_data = pdata;
+ }
+
+ drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+ drvdata->dev = &pdev->dev;
+ platform_set_drvdata(pdev, drvdata);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
+ if (!drvdata->base)
+ return -ENOMEM;
+
+ spin_lock_init(&drvdata->spinlock);
+
+ if (pdata && pdata->clk) {
+ drvdata->clk = pdata->clk;
+ ret = clk_prepare_enable(drvdata->clk);
+ if (ret)
+ return ret;
+ }
+
+ devid = tmc_readl(drvdata, CORESIGHT_DEVID);
+ drvdata->config_type = BMVAL(devid, 6, 7);
+
+ if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
+ if (pdev->dev.of_node)
+ ret = of_property_read_u32(pdev->dev.of_node,
+ "arm,buffer-size", &drvdata->size);
+ if (ret)
+ drvdata->size = SZ_1M;
+ } else {
+ drvdata->size = tmc_readl(drvdata, TMC_RSZ) * BYTES_PER_WORD;
+ }
+
+ clk_disable_unprepare(drvdata->clk);
+
+ if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
+ drvdata->vaddr = dma_alloc_coherent(dev, drvdata->size,
+ &drvdata->paddr, GFP_KERNEL);
+ if (!drvdata->vaddr)
+ return -ENOMEM;
+ memset(drvdata->vaddr, 0, drvdata->size);
+ drvdata->buf = drvdata->vaddr;
+ } else {
+ drvdata->buf = devm_kzalloc(dev, drvdata->size, GFP_KERNEL);
+ if (!drvdata->buf)
+ return -ENOMEM;
+ }
+
+ desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
+ if (!desc) {
+ ret = -ENOMEM;
+ goto err0;
+ }
+ if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
+ desc->type = CORESIGHT_DEV_TYPE_SINK;
+ desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
+ desc->ops = &tmc_etb_cs_ops;
+ desc->pdata = pdev->dev.platform_data;
+ desc->dev = &pdev->dev;
+ desc->debugfs_ops = tmc_etb_attr_grps;
+ desc->owner = THIS_MODULE;
+ drvdata->csdev = coresight_register(desc);
+ if (IS_ERR(drvdata->csdev)) {
+ ret = PTR_ERR(drvdata->csdev);
+ goto err0;
+ }
+ } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
+ desc->type = CORESIGHT_DEV_TYPE_SINK;
+ desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
+ desc->ops = &tmc_etr_cs_ops;
+ desc->pdata = pdev->dev.platform_data;
+ desc->dev = &pdev->dev;
+ desc->debugfs_ops = tmc_etr_attr_grps;
+ desc->owner = THIS_MODULE;
+ drvdata->csdev = coresight_register(desc);
+ if (IS_ERR(drvdata->csdev)) {
+ ret = PTR_ERR(drvdata->csdev);
+ goto err0;
+ }
+ } else {
+ desc->type = CORESIGHT_DEV_TYPE_LINKSINK;
+ desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
+ desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
+ desc->ops = &tmc_etf_cs_ops;
+ desc->pdata = pdev->dev.platform_data;
+ desc->dev = &pdev->dev;
+ desc->debugfs_ops = tmc_etf_attr_grps;
+ desc->owner = THIS_MODULE;
+ drvdata->csdev = coresight_register(desc);
+ if (IS_ERR(drvdata->csdev)) {
+ ret = PTR_ERR(drvdata->csdev);
+ goto err0;
+ }
+ }
+
+ drvdata->miscdev.name = ((struct coresight_platform_data *)
+ (pdev->dev.platform_data))->name;
+ drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
+ drvdata->miscdev.fops = &tmc_fops;
+ ret = misc_register(&drvdata->miscdev);
+ if (ret)
+ goto err1;
+
+ dev_info(dev, "TMC initialized\n");
+ return 0;
+err1:
+ coresight_unregister(drvdata->csdev);
+err0:
+ dma_free_coherent(dev, drvdata->size, &drvdata->paddr, GFP_KERNEL);
+ return ret;
+}
+
+static int tmc_remove(struct platform_device *pdev)
+{
+ struct tmc_drvdata *drvdata = platform_get_drvdata(pdev);
+
+ misc_deregister(&drvdata->miscdev);
+ coresight_unregister(drvdata->csdev);
+ dma_free_coherent(drvdata->dev, drvdata->size, &drvdata->paddr,
+ GFP_KERNEL);
+ return 0;
+}
+
+static struct of_device_id tmc_match[] = {
+ {.compatible = "arm,coresight-tmc"},
+ {}
+};
+
+static struct platform_driver tmc_driver = {
+ .probe = tmc_probe,
+ .remove = tmc_remove,
+ .driver = {
+ .name = "coresight-tmc",
+ .owner = THIS_MODULE,
+ .of_match_table = tmc_match,
+ },
+};
+
+static int __init tmc_init(void)
+{
+ return platform_driver_register(&tmc_driver);
+}
+module_init(tmc_init);
+
+static void __exit tmc_exit(void)
+{
+ platform_driver_unregister(&tmc_driver);
+}
+module_exit(tmc_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("CoreSight Trace Memory Controller driver");
--
1.9.1
--
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