drivers/hwtracing/coresight/coresight-tmc.c - third_party/linux - Git at Google

 /* Copyright (c) 2012, The Linux Foundation. All rights reserved.
  *
  * Description: CoreSight Trace Memory Controller driver
  *
  * 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/init.h>
 #include <linux/types.h>
 #include <linux/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/spinlock.h>
 #include <linux/pm_runtime.h>
 #include <linux/of.h>
 #include <linux/coresight.h>
 #include <linux/amba/bus.h>

 #include "coresight-priv.h"
 #include "coresight-tmc.h"

 void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
 {
 	/* Ensure formatter, unformatter and hardware fifo are empty */
 	if (coresight_timeout(drvdata->base,
 			      TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
 		dev_err(drvdata->dev,
 			"timeout while waiting for TMC to be Ready\n");
 	}
 }

 void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
 {
 	u32 ffcr;

 	ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
 	ffcr |= TMC_FFCR_STOP_ON_FLUSH;
 	writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
 	ffcr |= BIT(TMC_FFCR_FLUSHMAN_BIT);
 	writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
 	/* Ensure flush completes */
 	if (coresight_timeout(drvdata->base,
 			      TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
 		dev_err(drvdata->dev,
 		"timeout while waiting for completion of Manual Flush\n");
 	}

 	tmc_wait_for_tmcready(drvdata);
 }

 void tmc_enable_hw(struct tmc_drvdata *drvdata)
 {
 	writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);
 }

 void tmc_disable_hw(struct tmc_drvdata *drvdata)
 {
 	writel_relaxed(0x0, drvdata->base + TMC_CTL);
 }

 static int tmc_read_prepare(struct tmc_drvdata *drvdata)
 {
 	int ret = 0;

 	switch (drvdata->config_type) {
 	case TMC_CONFIG_TYPE_ETB:
 	case TMC_CONFIG_TYPE_ETF:
 		ret = tmc_read_prepare_etb(drvdata);
 		break;
 	case TMC_CONFIG_TYPE_ETR:
 		ret = tmc_read_prepare_etr(drvdata);
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	if (!ret)
 		dev_info(drvdata->dev, "TMC read start\n");

 	return ret;
 }

 static int tmc_read_unprepare(struct tmc_drvdata *drvdata)
 {
 	int ret = 0;

 	switch (drvdata->config_type) {
 	case TMC_CONFIG_TYPE_ETB:
 	case TMC_CONFIG_TYPE_ETF:
 		ret = tmc_read_unprepare_etb(drvdata);
 		break;
 	case TMC_CONFIG_TYPE_ETR:
 		ret = tmc_read_unprepare_etr(drvdata);
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	if (!ret)
 		dev_info(drvdata->dev, "TMC read end\n");

 	return ret;
 }

 static int tmc_open(struct inode *inode, struct file *file)
 {
 	int ret;
 	struct tmc_drvdata *drvdata = container_of(file->private_data,
 						   struct tmc_drvdata, miscdev);

 	ret = tmc_read_prepare(drvdata);
 	if (ret)
 		return ret;

 	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->len)
 		len = drvdata->len - *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: %zu bytes copied, %d bytes left\n",
 		__func__, len, (int)(drvdata->len - *ppos));
 	return len;
 }

 static int tmc_release(struct inode *inode, struct file *file)
 {
 	int ret;
 	struct tmc_drvdata *drvdata = container_of(file->private_data,
 						   struct tmc_drvdata, miscdev);

 	ret = tmc_read_unprepare(drvdata);
 	if (ret)
 		return ret;

 	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 enum tmc_mem_intf_width tmc_get_memwidth(u32 devid)
 {
 	enum tmc_mem_intf_width memwidth;

 	/*
 	 * Excerpt from the TRM:
 	 *
 	 * DEVID::MEMWIDTH[10:8]
 	 * 0x2 Memory interface databus is 32 bits wide.
 	 * 0x3 Memory interface databus is 64 bits wide.
 	 * 0x4 Memory interface databus is 128 bits wide.
 	 * 0x5 Memory interface databus is 256 bits wide.
 	 */
 	switch (BMVAL(devid, 8, 10)) {
 	case 0x2:
 		memwidth = TMC_MEM_INTF_WIDTH_32BITS;
 		break;
 	case 0x3:
 		memwidth = TMC_MEM_INTF_WIDTH_64BITS;
 		break;
 	case 0x4:
 		memwidth = TMC_MEM_INTF_WIDTH_128BITS;
 		break;
 	case 0x5:
 		memwidth = TMC_MEM_INTF_WIDTH_256BITS;
 		break;
 	default:
 		memwidth = 0;
 	}

 	return memwidth;
 }

 #define coresight_tmc_simple_func(name, offset)			\
 	coresight_simple_func(struct tmc_drvdata, NULL, name, offset)

 coresight_tmc_simple_func(rsz, TMC_RSZ);
 coresight_tmc_simple_func(sts, TMC_STS);
 coresight_tmc_simple_func(rrp, TMC_RRP);
 coresight_tmc_simple_func(rwp, TMC_RWP);
 coresight_tmc_simple_func(trg, TMC_TRG);
 coresight_tmc_simple_func(ctl, TMC_CTL);
 coresight_tmc_simple_func(ffsr, TMC_FFSR);
 coresight_tmc_simple_func(ffcr, TMC_FFCR);
 coresight_tmc_simple_func(mode, TMC_MODE);
 coresight_tmc_simple_func(pscr, TMC_PSCR);
 coresight_tmc_simple_func(devid, CORESIGHT_DEVID);

 static struct attribute *coresight_tmc_mgmt_attrs[] = {
 	&dev_attr_rsz.attr,
 	&dev_attr_sts.attr,
 	&dev_attr_rrp.attr,
 	&dev_attr_rwp.attr,
 	&dev_attr_trg.attr,
 	&dev_attr_ctl.attr,
 	&dev_attr_ffsr.attr,
 	&dev_attr_ffcr.attr,
 	&dev_attr_mode.attr,
 	&dev_attr_pscr.attr,
 	&dev_attr_devid.attr,
 	NULL,
 };

 static ssize_t trigger_cntr_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
 	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
 	unsigned long val = drvdata->trigger_cntr;

 	return sprintf(buf, "%#lx\n", val);
 }

 static ssize_t trigger_cntr_store(struct device *dev,
 			     struct device_attribute *attr,
 			     const char *buf, size_t size)
 {
 	int ret;
 	unsigned long val;
 	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);

 	ret = kstrtoul(buf, 16, &val);
 	if (ret)
 		return ret;

 	drvdata->trigger_cntr = val;
 	return size;
 }
 static DEVICE_ATTR_RW(trigger_cntr);

 static struct attribute *coresight_tmc_attrs[] = {
 	&dev_attr_trigger_cntr.attr,
 	NULL,
 };

 static const struct attribute_group coresight_tmc_group = {
 	.attrs = coresight_tmc_attrs,
 };

 static const struct attribute_group coresight_tmc_mgmt_group = {
 	.attrs = coresight_tmc_mgmt_attrs,
 	.name = "mgmt",
 };

 const struct attribute_group *coresight_tmc_groups[] = {
 	&coresight_tmc_group,
 	&coresight_tmc_mgmt_group,
 	NULL,
 };

 static int tmc_probe(struct amba_device *adev, const struct amba_id *id)
 {
 	int ret = 0;
 	u32 devid;
 	void __iomem *base;
 	struct device *dev = &adev->dev;
 	struct coresight_platform_data *pdata = NULL;
 	struct tmc_drvdata *drvdata;
 	struct resource *res = &adev->res;
 	struct coresight_desc desc = { 0 };
 	struct device_node *np = adev->dev.of_node;

 	if (np) {
 		pdata = of_get_coresight_platform_data(dev, np);
 		if (IS_ERR(pdata)) {
 			ret = PTR_ERR(pdata);
 			goto out;
 		}
 		adev->dev.platform_data = pdata;
 	}

 	ret = -ENOMEM;
 	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
 	if (!drvdata)
 		goto out;

 	drvdata->dev = &adev->dev;
 	dev_set_drvdata(dev, drvdata);

 	/* Validity for the resource is already checked by the AMBA core */
 	base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base)) {
 		ret = PTR_ERR(base);
 		goto out;
 	}

 	drvdata->base = base;

 	spin_lock_init(&drvdata->spinlock);

 	devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
 	drvdata->config_type = BMVAL(devid, 6, 7);
 	drvdata->memwidth = tmc_get_memwidth(devid);

 	if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
 		if (np)
 			ret = of_property_read_u32(np,
 						   "arm,buffer-size",
 						   &drvdata->size);
 		if (ret)
 			drvdata->size = SZ_1M;
 	} else {
 		drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
 	}

 	pm_runtime_put(&adev->dev);

 	desc.pdata = pdata;
 	desc.dev = dev;
 	desc.groups = coresight_tmc_groups;

 	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;
 	} 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;
 	} else {
 		desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
 		desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
 		desc.ops = &tmc_etf_cs_ops;
 	}

 	drvdata->csdev = coresight_register(&desc);
 	if (IS_ERR(drvdata->csdev)) {
 		ret = PTR_ERR(drvdata->csdev);
 		goto out;
 	}

 	drvdata->miscdev.name = pdata->name;
 	drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
 	drvdata->miscdev.fops = &tmc_fops;
 	ret = misc_register(&drvdata->miscdev);
 	if (ret)
 		coresight_unregister(drvdata->csdev);
 out:
 	return ret;
 }

 static struct amba_id tmc_ids[] = {
 	{
 		.id     = 0x0003b961,
 		.mask   = 0x0003ffff,
 	},
 	{ 0, 0},
 };

 static struct amba_driver tmc_driver = {
 	.drv = {
 		.name   = "coresight-tmc",
 		.owner  = THIS_MODULE,
 		.suppress_bind_attrs = true,
 	},
 	.probe		= tmc_probe,
 	.id_table	= tmc_ids,
 };
 builtin_amba_driver(tmc_driver);
	/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
	*
	* Description: CoreSight Trace Memory Controller driver
	*
	* 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/init.h>
	#include <linux/types.h>
	#include <linux/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/spinlock.h>
	#include <linux/pm_runtime.h>
	#include <linux/of.h>
	#include <linux/coresight.h>
	#include <linux/amba/bus.h>

	#include "coresight-priv.h"
	#include "coresight-tmc.h"

	void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
	{
	/* Ensure formatter, unformatter and hardware fifo are empty */
	if (coresight_timeout(drvdata->base,
	TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
	dev_err(drvdata->dev,
	"timeout while waiting for TMC to be Ready\n");
	}
	}

	void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
	{
	u32 ffcr;

	ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
	ffcr \|= TMC_FFCR_STOP_ON_FLUSH;
	writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
	ffcr \|= BIT(TMC_FFCR_FLUSHMAN_BIT);
	writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
	/* Ensure flush completes */
	if (coresight_timeout(drvdata->base,
	TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
	dev_err(drvdata->dev,
	"timeout while waiting for completion of Manual Flush\n");
	}

	tmc_wait_for_tmcready(drvdata);
	}

	void tmc_enable_hw(struct tmc_drvdata *drvdata)
	{
	writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);
	}

	void tmc_disable_hw(struct tmc_drvdata *drvdata)
	{
	writel_relaxed(0x0, drvdata->base + TMC_CTL);
	}

	static int tmc_read_prepare(struct tmc_drvdata *drvdata)
	{
	int ret = 0;

	switch (drvdata->config_type) {
	case TMC_CONFIG_TYPE_ETB:
	case TMC_CONFIG_TYPE_ETF:
	ret = tmc_read_prepare_etb(drvdata);
	break;
	case TMC_CONFIG_TYPE_ETR:
	ret = tmc_read_prepare_etr(drvdata);
	break;
	default:
	ret = -EINVAL;
	}

	if (!ret)
	dev_info(drvdata->dev, "TMC read start\n");

	return ret;
	}

	static int tmc_read_unprepare(struct tmc_drvdata *drvdata)
	{
	int ret = 0;

	switch (drvdata->config_type) {
	case TMC_CONFIG_TYPE_ETB:
	case TMC_CONFIG_TYPE_ETF:
	ret = tmc_read_unprepare_etb(drvdata);
	break;
	case TMC_CONFIG_TYPE_ETR:
	ret = tmc_read_unprepare_etr(drvdata);
	break;
	default:
	ret = -EINVAL;
	}

	if (!ret)
	dev_info(drvdata->dev, "TMC read end\n");

	return ret;
	}

	static int tmc_open(struct inode inode, struct file file)
	{
	int ret;
	struct tmc_drvdata *drvdata = container_of(file->private_data,
	struct tmc_drvdata, miscdev);

	ret = tmc_read_prepare(drvdata);
	if (ret)
	return ret;

	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->len)
	len = drvdata->len - *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: %zu bytes copied, %d bytes left\n",
	__func__, len, (int)(drvdata->len - *ppos));
	return len;
	}

	static int tmc_release(struct inode inode, struct file file)
	{
	int ret;
	struct tmc_drvdata *drvdata = container_of(file->private_data,
	struct tmc_drvdata, miscdev);

	ret = tmc_read_unprepare(drvdata);
	if (ret)
	return ret;

	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 enum tmc_mem_intf_width tmc_get_memwidth(u32 devid)
	{
	enum tmc_mem_intf_width memwidth;

	/*
	* Excerpt from the TRM:
	*
	* DEVID::MEMWIDTH[10:8]
	* 0x2 Memory interface databus is 32 bits wide.
	* 0x3 Memory interface databus is 64 bits wide.
	* 0x4 Memory interface databus is 128 bits wide.
	* 0x5 Memory interface databus is 256 bits wide.
	*/
	switch (BMVAL(devid, 8, 10)) {
	case 0x2:
	memwidth = TMC_MEM_INTF_WIDTH_32BITS;
	break;
	case 0x3:
	memwidth = TMC_MEM_INTF_WIDTH_64BITS;
	break;
	case 0x4:
	memwidth = TMC_MEM_INTF_WIDTH_128BITS;
	break;
	case 0x5:
	memwidth = TMC_MEM_INTF_WIDTH_256BITS;
	break;
	default:
	memwidth = 0;
	}

	return memwidth;
	}

	#define coresight_tmc_simple_func(name, offset) \
	coresight_simple_func(struct tmc_drvdata, NULL, name, offset)

	coresight_tmc_simple_func(rsz, TMC_RSZ);
	coresight_tmc_simple_func(sts, TMC_STS);
	coresight_tmc_simple_func(rrp, TMC_RRP);
	coresight_tmc_simple_func(rwp, TMC_RWP);
	coresight_tmc_simple_func(trg, TMC_TRG);
	coresight_tmc_simple_func(ctl, TMC_CTL);
	coresight_tmc_simple_func(ffsr, TMC_FFSR);
	coresight_tmc_simple_func(ffcr, TMC_FFCR);
	coresight_tmc_simple_func(mode, TMC_MODE);
	coresight_tmc_simple_func(pscr, TMC_PSCR);
	coresight_tmc_simple_func(devid, CORESIGHT_DEVID);

	static struct attribute *coresight_tmc_mgmt_attrs[] = {
	&dev_attr_rsz.attr,
	&dev_attr_sts.attr,
	&dev_attr_rrp.attr,
	&dev_attr_rwp.attr,
	&dev_attr_trg.attr,
	&dev_attr_ctl.attr,
	&dev_attr_ffsr.attr,
	&dev_attr_ffcr.attr,
	&dev_attr_mode.attr,
	&dev_attr_pscr.attr,
	&dev_attr_devid.attr,
	NULL,
	};

	static ssize_t trigger_cntr_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
	unsigned long val = drvdata->trigger_cntr;

	return sprintf(buf, "%#lx\n", val);
	}

	static ssize_t trigger_cntr_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t size)
	{
	int ret;
	unsigned long val;
	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);

	ret = kstrtoul(buf, 16, &val);
	if (ret)
	return ret;

	drvdata->trigger_cntr = val;
	return size;
	}
	static DEVICE_ATTR_RW(trigger_cntr);

	static struct attribute *coresight_tmc_attrs[] = {
	&dev_attr_trigger_cntr.attr,
	NULL,
	};

	static const struct attribute_group coresight_tmc_group = {
	.attrs = coresight_tmc_attrs,
	};

	static const struct attribute_group coresight_tmc_mgmt_group = {
	.attrs = coresight_tmc_mgmt_attrs,
	.name = "mgmt",
	};

	const struct attribute_group *coresight_tmc_groups[] = {
	&coresight_tmc_group,
	&coresight_tmc_mgmt_group,
	NULL,
	};

	static int tmc_probe(struct amba_device adev, const struct amba_id id)
	{
	int ret = 0;
	u32 devid;
	void __iomem *base;
	struct device *dev = &adev->dev;
	struct coresight_platform_data *pdata = NULL;
	struct tmc_drvdata *drvdata;
	struct resource *res = &adev->res;
	struct coresight_desc desc = { 0 };
	struct device_node *np = adev->dev.of_node;

	if (np) {
	pdata = of_get_coresight_platform_data(dev, np);
	if (IS_ERR(pdata)) {
	ret = PTR_ERR(pdata);
	goto out;
	}
	adev->dev.platform_data = pdata;
	}

	ret = -ENOMEM;
	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
	if (!drvdata)
	goto out;

	drvdata->dev = &adev->dev;
	dev_set_drvdata(dev, drvdata);

	/* Validity for the resource is already checked by the AMBA core */
	base = devm_ioremap_resource(dev, res);
	if (IS_ERR(base)) {
	ret = PTR_ERR(base);
	goto out;
	}

	drvdata->base = base;

	spin_lock_init(&drvdata->spinlock);

	devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
	drvdata->config_type = BMVAL(devid, 6, 7);
	drvdata->memwidth = tmc_get_memwidth(devid);

	if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
	if (np)
	ret = of_property_read_u32(np,
	"arm,buffer-size",
	&drvdata->size);
	if (ret)
	drvdata->size = SZ_1M;
	} else {
	drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
	}

	pm_runtime_put(&adev->dev);

	desc.pdata = pdata;
	desc.dev = dev;
	desc.groups = coresight_tmc_groups;

	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;
	} 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;
	} else {
	desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
	desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
	desc.ops = &tmc_etf_cs_ops;
	}

	drvdata->csdev = coresight_register(&desc);
	if (IS_ERR(drvdata->csdev)) {
	ret = PTR_ERR(drvdata->csdev);
	goto out;
	}

	drvdata->miscdev.name = pdata->name;
	drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
	drvdata->miscdev.fops = &tmc_fops;
	ret = misc_register(&drvdata->miscdev);
	if (ret)
	coresight_unregister(drvdata->csdev);
	out:
	return ret;
	}

	static struct amba_id tmc_ids[] = {
	{
	.id = 0x0003b961,
	.mask = 0x0003ffff,
	},
	{ 0, 0},
	};

	static struct amba_driver tmc_driver = {
	.drv = {
	.name = "coresight-tmc",
	.owner = THIS_MODULE,
	.suppress_bind_attrs = true,
	},
	.probe = tmc_probe,
	.id_table = tmc_ids,
	};
	builtin_amba_driver(tmc_driver);