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Commit e9b98347 authored by Mulu He's avatar Mulu He Committed by Gerrit - the friendly Code Review server
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coresight: csr: Add snapshot of Coresight CSR driver 



This is a snapshot of the coresight-cti driver as of msm-4.14
commit '7d42028b99d32ad6ec82aa429378fba0280a1c4a'.byte-cntr: Read 64bit rwp
TMC RWP has two 32bit registers which combine to one 64bit register.
Read correct RWP register in byte counter driver.

Change-Id: Ie4c87252dfb4e462bdde2175b1af999c891fe555
Signed-off-by: default avatarMulu He <muluhe@codeaurora.org>
parent c30ac549

drivers/hwtracing/coresight/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ config CORESIGHT_LINKS_AND_SINKS 
config CORESIGHT_LINK_AND_SINK_TMC

	bool "Coresight generic TMC driver"

	depends on CORESIGHT_LINKS_AND_SINKS

	select CORESIGHT_CSR

	help

	  This enables support for the Trace Memory Controller driver.

	  Depending on its configuration the device can act as a link (embedded
@@ -158,4 +159,12 @@ config CORESIGHT_TPDM_DEFAULT_ENABLE 


	  If unsure, say 'N' here to avoid potential power and performance

	  penalty.



config CORESIGHT_CSR

	bool "CoreSight Slave Register driver"

	help

	  This driver provides support for CoreSight Slave Register block

	  that hosts miscellaneous configuration registers.

	  Those configuration registers can be used to control, various

	  coresight configurations.

endif

drivers/hwtracing/coresight/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -23,3 +23,4 @@ obj-$(CONFIG_CORESIGHT_CTI) += coresight-cti.o 
obj-$(CONFIG_CORESIGHT_OST) += coresight-ost.o

obj-$(CONFIG_CORESIGHT_TPDA) += coresight-tpda.o

obj-$(CONFIG_CORESIGHT_TPDM) += coresight-tpdm.o

obj-$(CONFIG_CORESIGHT_CSR) += coresight-csr.o

drivers/hwtracing/coresight/coresight-common.h

+26 −0
Original line number Diff line number Diff line
@@ -9,4 +9,30 @@ 
#define BM(lsb, msb)		((BIT(msb) - BIT(lsb)) + BIT(msb))

#define BVAL(val, n)            ((val & BIT(n)) >> n)



struct coresight_csr {

	const char *name;

	struct list_head link;

};



#ifdef CONFIG_CORESIGHT_CSR

extern void msm_qdss_csr_enable_bam_to_usb(struct coresight_csr *csr);

extern void msm_qdss_csr_disable_bam_to_usb(struct coresight_csr *csr);

extern void msm_qdss_csr_disable_flush(struct coresight_csr *csr);

extern int coresight_csr_hwctrl_set(struct coresight_csr *csr, uint64_t addr,

				 uint32_t val);

extern void coresight_csr_set_byte_cntr(struct coresight_csr *csr,

				 uint32_t count);

extern struct coresight_csr *coresight_csr_get(const char *name);

#else

static inline void msm_qdss_csr_enable_bam_to_usb(struct coresight_csr *csr) {}

static inline void msm_qdss_csr_disable_bam_to_usb(struct coresight_csr *csr) {}

static inline void msm_qdss_csr_disable_flush(struct coresight_csr *csr) {}

static inline int coresight_csr_hwctrl_set(struct coresight_csr *csr,

	uint64_t addr, uint32_t val) { return -EINVAL; }

static inline void coresight_csr_set_byte_cntr(struct coresight_csr *csr,

					   uint32_t count) {}

static inline struct coresight_csr *coresight_csr_get(const char *name)

					{ return NULL; }

#endif



#endif

drivers/hwtracing/coresight/coresight-csr.c

0 → 100644
+442 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (c) 2012-2013, 2015-2-17 The Linux Foundation. All rights reserved.

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/device.h>

#include <linux/platform_device.h>

#include <linux/io.h>

#include <linux/err.h>

#include <linux/slab.h>

#include <linux/of.h>

#include <linux/coresight.h>

#include <linux/clk.h>

#include <linux/mutex.h>



#include "coresight-priv.h"



#define csr_writel(drvdata, val, off)	__raw_writel((val), drvdata->base + off)

#define csr_readl(drvdata, off)		__raw_readl(drvdata->base + off)



#define CSR_LOCK(drvdata)						\

do {									\

	mb(); /* ensure configuration take effect before we lock it */	\

	csr_writel(drvdata, 0x0, CORESIGHT_LAR);			\

} while (0)

#define CSR_UNLOCK(drvdata)						\

do {									\

	csr_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR);		\

	mb(); /* ensure unlock take effect before we configure */	\

} while (0)



#define CSR_SWDBGPWRCTRL	(0x000)

#define CSR_SWDBGPWRACK		(0x004)

#define CSR_SWSPADREG0		(0x008)

#define CSR_SWSPADREG1		(0x00C)

#define CSR_STMTRANSCTRL	(0x010)

#define CSR_STMAWIDCTRL		(0x014)

#define CSR_STMCHNOFST0		(0x018)

#define CSR_STMCHNOFST1		(0x01C)

#define CSR_STMEXTHWCTRL0	(0x020)

#define CSR_STMEXTHWCTRL1	(0x024)

#define CSR_STMEXTHWCTRL2	(0x028)

#define CSR_STMEXTHWCTRL3	(0x02C)

#define CSR_USBBAMCTRL		(0x030)

#define CSR_USBFLSHCTRL		(0x034)

#define CSR_TIMESTAMPCTRL	(0x038)

#define CSR_AOTIMEVAL0		(0x03C)

#define CSR_AOTIMEVAL1		(0x040)

#define CSR_QDSSTIMEVAL0	(0x044)

#define CSR_QDSSTIMEVAL1	(0x048)

#define CSR_QDSSTIMELOAD0	(0x04C)

#define CSR_QDSSTIMELOAD1	(0x050)

#define CSR_DAPMSAVAL		(0x054)

#define CSR_QDSSCLKVOTE		(0x058)

#define CSR_QDSSCLKIPI		(0x05C)

#define CSR_QDSSPWRREQIGNORE	(0x060)

#define CSR_QDSSSPARE		(0x064)

#define CSR_IPCAT		(0x068)

#define CSR_BYTECNTVAL		(0x06C)



#define BLKSIZE_256		0

#define BLKSIZE_512		1

#define BLKSIZE_1024		2

#define BLKSIZE_2048		3



struct csr_drvdata {

	void __iomem		*base;

	phys_addr_t		pbase;

	struct device		*dev;

	struct coresight_device	*csdev;

	uint32_t		blksize;

	struct coresight_csr		csr;

	struct clk		*clk;

	spinlock_t		spin_lock;

	bool			usb_bam_support;

	bool			hwctrl_set_support;

	bool			set_byte_cntr_support;

	bool			timestamp_support;

};



static LIST_HEAD(csr_list);

static DEFINE_MUTEX(csr_lock);



#define to_csr_drvdata(c) container_of(c, struct csr_drvdata, csr)



void msm_qdss_csr_enable_bam_to_usb(struct coresight_csr *csr)

{

	struct csr_drvdata *drvdata;

	uint32_t usbbamctrl, usbflshctrl;

	unsigned long flags;



	if (csr == NULL)

		return;



	drvdata = to_csr_drvdata(csr);

	if (IS_ERR_OR_NULL(drvdata) || !drvdata->usb_bam_support)

		return;



	spin_lock_irqsave(&drvdata->spin_lock, flags);

	CSR_UNLOCK(drvdata);



	usbbamctrl = csr_readl(drvdata, CSR_USBBAMCTRL);

	usbbamctrl = (usbbamctrl & ~0x3) | drvdata->blksize;

	csr_writel(drvdata, usbbamctrl, CSR_USBBAMCTRL);



	usbflshctrl = csr_readl(drvdata, CSR_USBFLSHCTRL);

	usbflshctrl = (usbflshctrl & ~0x3FFFC) | (0xFFFF << 2);

	csr_writel(drvdata, usbflshctrl, CSR_USBFLSHCTRL);

	usbflshctrl |= 0x2;

	csr_writel(drvdata, usbflshctrl, CSR_USBFLSHCTRL);



	usbbamctrl |= 0x4;

	csr_writel(drvdata, usbbamctrl, CSR_USBBAMCTRL);



	CSR_LOCK(drvdata);

	spin_unlock_irqrestore(&drvdata->spin_lock, flags);

}

EXPORT_SYMBOL(msm_qdss_csr_enable_bam_to_usb);



void msm_qdss_csr_disable_bam_to_usb(struct coresight_csr *csr)

{

	struct csr_drvdata *drvdata;

	uint32_t usbbamctrl;

	unsigned long flags;



	if (csr == NULL)

		return;



	drvdata = to_csr_drvdata(csr);

	if (IS_ERR_OR_NULL(drvdata) || !drvdata->usb_bam_support)

		return;



	spin_lock_irqsave(&drvdata->spin_lock, flags);

	CSR_UNLOCK(drvdata);



	usbbamctrl = csr_readl(drvdata, CSR_USBBAMCTRL);

	usbbamctrl &= (~0x4);

	csr_writel(drvdata, usbbamctrl, CSR_USBBAMCTRL);



	CSR_LOCK(drvdata);

	spin_unlock_irqrestore(&drvdata->spin_lock, flags);

}

EXPORT_SYMBOL(msm_qdss_csr_disable_bam_to_usb);



void msm_qdss_csr_disable_flush(struct coresight_csr *csr)

{

	struct csr_drvdata *drvdata;

	uint32_t usbflshctrl;

	unsigned long flags;



	if (csr == NULL)

		return;



	drvdata = to_csr_drvdata(csr);

	if (IS_ERR_OR_NULL(drvdata) || !drvdata->usb_bam_support)

		return;



	spin_lock_irqsave(&drvdata->spin_lock, flags);

	CSR_UNLOCK(drvdata);



	usbflshctrl = csr_readl(drvdata, CSR_USBFLSHCTRL);

	usbflshctrl &= ~0x2;

	csr_writel(drvdata, usbflshctrl, CSR_USBFLSHCTRL);



	CSR_LOCK(drvdata);

	spin_unlock_irqrestore(&drvdata->spin_lock, flags);

}

EXPORT_SYMBOL(msm_qdss_csr_disable_flush);



int coresight_csr_hwctrl_set(struct coresight_csr *csr, uint64_t addr,

			 uint32_t val)

{

	struct csr_drvdata *drvdata;

	int ret = 0;

	unsigned long flags;



	if (csr == NULL)

		return -EINVAL;



	drvdata = to_csr_drvdata(csr);

	if (IS_ERR_OR_NULL(drvdata) || !drvdata->hwctrl_set_support)

		return -EINVAL;



	spin_lock_irqsave(&drvdata->spin_lock, flags);

	CSR_UNLOCK(drvdata);



	if (addr == (drvdata->pbase + CSR_STMEXTHWCTRL0))

		csr_writel(drvdata, val, CSR_STMEXTHWCTRL0);

	else if (addr == (drvdata->pbase + CSR_STMEXTHWCTRL1))

		csr_writel(drvdata, val, CSR_STMEXTHWCTRL1);

	else if (addr == (drvdata->pbase + CSR_STMEXTHWCTRL2))

		csr_writel(drvdata, val, CSR_STMEXTHWCTRL2);

	else if (addr == (drvdata->pbase + CSR_STMEXTHWCTRL3))

		csr_writel(drvdata, val, CSR_STMEXTHWCTRL3);

	else

		ret = -EINVAL;



	CSR_LOCK(drvdata);

	spin_unlock_irqrestore(&drvdata->spin_lock, flags);

	return ret;

}

EXPORT_SYMBOL(coresight_csr_hwctrl_set);



void coresight_csr_set_byte_cntr(struct coresight_csr *csr, uint32_t count)

{

	struct csr_drvdata *drvdata;

	unsigned long flags;



	if (csr == NULL)

		return;



	drvdata = to_csr_drvdata(csr);

	if (IS_ERR_OR_NULL(drvdata) || !drvdata->set_byte_cntr_support)

		return;



	spin_lock_irqsave(&drvdata->spin_lock, flags);

	CSR_UNLOCK(drvdata);



	csr_writel(drvdata, count, CSR_BYTECNTVAL);



	/* make sure byte count value is written */

	mb();



	CSR_LOCK(drvdata);

	spin_unlock_irqrestore(&drvdata->spin_lock, flags);

}

EXPORT_SYMBOL(coresight_csr_set_byte_cntr);



struct coresight_csr *coresight_csr_get(const char *name)

{

	struct coresight_csr *csr;



	mutex_lock(&csr_lock);

	list_for_each_entry(csr, &csr_list, link) {

		if (!strcmp(csr->name, name)) {

			mutex_unlock(&csr_lock);

			return csr;

		}

	}



	mutex_unlock(&csr_lock);

	return ERR_PTR(-EINVAL);

}

EXPORT_SYMBOL(coresight_csr_get);



static ssize_t timestamp_show(struct device *dev,

				struct device_attribute *attr,

				char *buf)

{

	ssize_t size = 0;

	uint64_t time_tick = 0;

	uint32_t val, time_val0, time_val1;

	int ret;

	unsigned long flags;



	struct csr_drvdata *drvdata = dev_get_drvdata(dev->parent);



	if (IS_ERR_OR_NULL(drvdata) || !drvdata->timestamp_support) {

		dev_err(dev, "Invalid param\n");

		return 0;

	}



	ret = clk_prepare_enable(drvdata->clk);

	if (ret)

		return ret;



	spin_lock_irqsave(&drvdata->spin_lock, flags);

	CSR_UNLOCK(drvdata);



	val = csr_readl(drvdata, CSR_TIMESTAMPCTRL);



	val  = val & ~BIT(0);

	csr_writel(drvdata, val, CSR_TIMESTAMPCTRL);



	val  = val | BIT(0);

	csr_writel(drvdata, val, CSR_TIMESTAMPCTRL);



	time_val0 = csr_readl(drvdata, CSR_QDSSTIMEVAL0);

	time_val1 = csr_readl(drvdata, CSR_QDSSTIMEVAL1);



	CSR_LOCK(drvdata);

	spin_unlock_irqrestore(&drvdata->spin_lock, flags);



	clk_disable_unprepare(drvdata->clk);



	time_tick |= (uint64_t)time_val1 << 32;

	time_tick |= (uint64_t)time_val0;

	size = scnprintf(buf, PAGE_SIZE, "%llu\n", time_tick);

	dev_dbg(dev, "timestamp : %s\n", buf);

	return size;

}



static DEVICE_ATTR_RO(timestamp);



static struct attribute *csr_attrs[] = {

	&dev_attr_timestamp.attr,

	NULL,

};



static struct attribute_group csr_attr_grp = {

	.attrs = csr_attrs,

};

static const struct attribute_group *csr_attr_grps[] = {

	&csr_attr_grp,

	NULL,

};



static int csr_probe(struct platform_device *pdev)

{

	int ret;

	struct device *dev = &pdev->dev;

	struct coresight_platform_data *pdata;

	struct csr_drvdata *drvdata;

	struct resource *res;

	struct coresight_desc *desc;



	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);



	drvdata->clk = devm_clk_get(dev, "apb_pclk");

	if (IS_ERR(drvdata->clk))

		dev_dbg(dev, "csr not config clk\n");



	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "csr-base");

	if (!res)

		return -ENODEV;

	drvdata->pbase = res->start;



	drvdata->base = devm_ioremap(dev, res->start, resource_size(res));

	if (!drvdata->base)

		return -ENOMEM;



	ret = of_property_read_u32(pdev->dev.of_node, "qcom,blk-size",

			&drvdata->blksize);

	if (ret)

		drvdata->blksize = BLKSIZE_256;



	drvdata->usb_bam_support = of_property_read_bool(pdev->dev.of_node,

						"qcom,usb-bam-support");

	if (!drvdata->usb_bam_support)

		dev_dbg(dev, "usb_bam support handled by other subsystem\n");

	else

		dev_dbg(dev, "usb_bam operation supported\n");



	drvdata->hwctrl_set_support = of_property_read_bool(pdev->dev.of_node,

						"qcom,hwctrl-set-support");

	if (!drvdata->hwctrl_set_support)

		dev_dbg(dev, "hwctrl_set_support handled by other subsystem\n");

	else

		dev_dbg(dev, "hwctrl_set_support operation supported\n");



	drvdata->set_byte_cntr_support = of_property_read_bool(

			pdev->dev.of_node, "qcom,set-byte-cntr-support");

	if (!drvdata->set_byte_cntr_support)

		dev_dbg(dev, "set byte_cntr_support handled by other subsystem\n");

	else

		dev_dbg(dev, "set_byte_cntr_support operation supported\n");



	drvdata->timestamp_support = of_property_read_bool(pdev->dev.of_node,

						"qcom,timestamp-support");

	if (!drvdata->timestamp_support)

		dev_dbg(dev, "timestamp_support handled by other subsystem\n");

	else

		dev_dbg(dev, "timestamp_support operation supported\n");



	desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);

	if (!desc)

		return -ENOMEM;

	desc->type = CORESIGHT_DEV_TYPE_NONE;

	desc->pdata = pdev->dev.platform_data;

	desc->dev = &pdev->dev;

	if (drvdata->timestamp_support)

		desc->groups = csr_attr_grps;



	drvdata->csdev = coresight_register(desc);

	if (IS_ERR(drvdata->csdev))

		return PTR_ERR(drvdata->csdev);



	/* Store the driver data pointer for use in exported functions */

	spin_lock_init(&drvdata->spin_lock);

	drvdata->csr.name = ((struct coresight_platform_data *)

					 (pdev->dev.platform_data))->name;



	mutex_lock(&csr_lock);

	list_add_tail(&drvdata->csr.link, &csr_list);

	mutex_unlock(&csr_lock);



	dev_info(dev, "CSR initialized: %s\n", drvdata->csr.name);

	return 0;

}



static int csr_remove(struct platform_device *pdev)

{

	struct csr_drvdata *drvdata = platform_get_drvdata(pdev);



	mutex_lock(&csr_lock);

	list_del(&drvdata->csr.link);

	mutex_unlock(&csr_lock);



	coresight_unregister(drvdata->csdev);

	return 0;

}



static const struct of_device_id csr_match[] = {

	{.compatible = "qcom,coresight-csr"},

	{}

};



static struct platform_driver csr_driver = {

	.probe          = csr_probe,

	.remove         = csr_remove,

	.driver         = {

		.name   = "coresight-csr",

		.of_match_table = csr_match,

	},

};



static int __init csr_init(void)

{

	return platform_driver_register(&csr_driver);

}

module_init(csr_init);



static void __exit csr_exit(void)

{

	platform_driver_unregister(&csr_driver);

}

module_exit(csr_exit);



MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("CoreSight CSR driver");