[linux-2.6-block.git] / drivers / hwtracing / coresight / coresight-tmc.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
 *
 * Description: CoreSight Trace Memory Controller driver
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/device.h>
#include <linux/idr.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/mutex.h>
#include <linux/property.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->csdev->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->csdev->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_dbg(&drvdata->csdev->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_dbg(&drvdata->csdev->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->csdev->dev, "%s: successfully opened\n", __func__);
	return 0;
}

static inline ssize_t tmc_get_sysfs_trace(struct tmc_drvdata *drvdata,
					  loff_t pos, size_t len, char **bufpp)
{
	switch (drvdata->config_type) {
	case TMC_CONFIG_TYPE_ETB:
	case TMC_CONFIG_TYPE_ETF:
		return tmc_etb_get_sysfs_trace(drvdata, pos, len, bufpp);
	case TMC_CONFIG_TYPE_ETR:
		return tmc_etr_get_sysfs_trace(drvdata, pos, len, bufpp);
	}

	return -EINVAL;
}

static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
			loff_t *ppos)
{
	char *bufp;
	ssize_t actual;
	struct tmc_drvdata *drvdata = container_of(file->private_data,
						   struct tmc_drvdata, miscdev);
	actual = tmc_get_sysfs_trace(drvdata, *ppos, len, &bufp);
	if (actual <= 0)
		return 0;

	if (copy_to_user(data, bufp, actual)) {
		dev_dbg(&drvdata->csdev->dev,
			"%s: copy_to_user failed\n", __func__);
		return -EFAULT;
	}

	*ppos += actual;
	dev_dbg(&drvdata->csdev->dev, "%zu bytes copied\n", actual);

	return actual;
}

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->csdev->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_reg(name, offset)			\
	coresight_simple_reg32(struct tmc_drvdata, name, offset)
#define coresight_tmc_reg64(name, lo_off, hi_off)	\
	coresight_simple_reg64(struct tmc_drvdata, name, lo_off, hi_off)

coresight_tmc_reg(rsz, TMC_RSZ);
coresight_tmc_reg(sts, TMC_STS);
coresight_tmc_reg(trg, TMC_TRG);
coresight_tmc_reg(ctl, TMC_CTL);
coresight_tmc_reg(ffsr, TMC_FFSR);
coresight_tmc_reg(ffcr, TMC_FFCR);
coresight_tmc_reg(mode, TMC_MODE);
coresight_tmc_reg(pscr, TMC_PSCR);
coresight_tmc_reg(axictl, TMC_AXICTL);
coresight_tmc_reg(devid, CORESIGHT_DEVID);
coresight_tmc_reg64(rrp, TMC_RRP, TMC_RRPHI);
coresight_tmc_reg64(rwp, TMC_RWP, TMC_RWPHI);
coresight_tmc_reg64(dba, TMC_DBALO, TMC_DBAHI);

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,
	&dev_attr_dba.attr,
	&dev_attr_axictl.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 ssize_t buffer_size_show(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);

	return sprintf(buf, "%#x\n", drvdata->size);
}

static ssize_t buffer_size_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);

	/* Only permitted for TMC-ETRs */
	if (drvdata->config_type != TMC_CONFIG_TYPE_ETR)
		return -EPERM;

	ret = kstrtoul(buf, 0, &val);
	if (ret)
		return ret;
	/* The buffer size should be page aligned */
	if (val & (PAGE_SIZE - 1))
		return -EINVAL;
	drvdata->size = val;
	return size;
}

static DEVICE_ATTR_RW(buffer_size);

static struct attribute *coresight_tmc_attrs[] = {
	&dev_attr_trigger_cntr.attr,
	&dev_attr_buffer_size.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 inline bool tmc_etr_can_use_sg(struct device *dev)
{
	return fwnode_property_present(dev->fwnode, "arm,scatter-gather");
}

/* Detect and initialise the capabilities of a TMC ETR */
static int tmc_etr_setup_caps(struct device *parent, u32 devid, void *dev_caps)
{
	int rc;
	u32 dma_mask = 0;
	struct tmc_drvdata *drvdata = dev_get_drvdata(parent);

	/* Set the unadvertised capabilities */
	tmc_etr_init_caps(drvdata, (u32)(unsigned long)dev_caps);

	if (!(devid & TMC_DEVID_NOSCAT) && tmc_etr_can_use_sg(parent))
		tmc_etr_set_cap(drvdata, TMC_ETR_SG);

	/* Check if the AXI address width is available */
	if (devid & TMC_DEVID_AXIAW_VALID)
		dma_mask = ((devid >> TMC_DEVID_AXIAW_SHIFT) &
				TMC_DEVID_AXIAW_MASK);

	/*
	 * Unless specified in the device configuration, ETR uses a 40-bit
	 * AXI master in place of the embedded SRAM of ETB/ETF.
	 */
	switch (dma_mask) {
	case 32:
	case 40:
	case 44:
	case 48:
	case 52:
		dev_info(parent, "Detected dma mask %dbits\n", dma_mask);
		break;
	default:
		dma_mask = 40;
	}

	rc = dma_set_mask_and_coherent(parent, DMA_BIT_MASK(dma_mask));
	if (rc)
		dev_err(parent, "Failed to setup DMA mask: %d\n", rc);
	return rc;
}

static u32 tmc_etr_get_default_buffer_size(struct device *dev)
{
	u32 size;

	if (fwnode_property_read_u32(dev->fwnode, "arm,buffer-size", &size))
		size = SZ_1M;
	return size;
}

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 };

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

	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);
	/* This device is not associated with a session */
	drvdata->pid = -1;

	if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
		drvdata->size = tmc_etr_get_default_buffer_size(dev);
	else
		drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;

	desc.dev = dev;
	desc.groups = coresight_tmc_groups;
	desc.name = dev_name(dev);

	switch (drvdata->config_type) {
	case 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;
		break;
	case 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;
		ret = tmc_etr_setup_caps(dev, devid,
					 coresight_get_uci_data(id));
		if (ret)
			goto out;
		idr_init(&drvdata->idr);
		mutex_init(&drvdata->idr_mutex);
		break;
	case TMC_CONFIG_TYPE_ETF:
		desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
		desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
		desc.ops = &tmc_etf_cs_ops;
		break;
	default:
		pr_err("%s: Unsupported TMC config\n", desc.name);
		ret = -EINVAL;
		goto out;
	}

	pdata = coresight_get_platform_data(dev);
	if (IS_ERR(pdata)) {
		ret = PTR_ERR(pdata);
		goto out;
	}
	adev->dev.platform_data = pdata;
	desc.pdata = pdata;

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

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

static const struct amba_id tmc_ids[] = {
	CS_AMBA_ID(0x000bb961),
	/* Coresight SoC 600 TMC-ETR/ETS */
	CS_AMBA_ID_DATA(0x000bb9e8, (unsigned long)CORESIGHT_SOC_600_ETR_CAPS),
	/* Coresight SoC 600 TMC-ETB */
	CS_AMBA_ID(0x000bb9e9),
	/* Coresight SoC 600 TMC-ETF */
	CS_AMBA_ID(0x000bb9ea),
	{ 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);
Commit	Line	Data
ad0dfdfd	1	// SPDX-License-Identifier: GPL-2.0
bc4bf7fe	2	/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
941943cf PG	3	*
941943cf PG	4	* Description: CoreSight Trace Memory Controller driver
bc4bf7fe PP	5	*/
	6
	7	#include <linux/kernel.h>
bc4bf7fe PP	8	#include <linux/init.h>
	9	#include <linux/types.h>
	10	#include <linux/device.h>
c5ff7344	11	#include <linux/idr.h>
bc4bf7fe PP	12	#include <linux/io.h>
	13	#include <linux/err.h>
	14	#include <linux/fs.h>
	15	#include <linux/miscdevice.h>
c5ff7344	16	#include <linux/mutex.h>
ed2cfb2b	17	#include <linux/property.h>
bc4bf7fe PP	18	#include <linux/uaccess.h>
	19	#include <linux/slab.h>
	20	#include <linux/dma-mapping.h>
	21	#include <linux/spinlock.h>
32398ef6	22	#include <linux/pm_runtime.h>
bc4bf7fe PP	23	#include <linux/of.h>
	24	#include <linux/coresight.h>
	25	#include <linux/amba/bus.h>
	26
	27	#include "coresight-priv.h"
4c324b5f	28	#include "coresight-tmc.h"
bc4bf7fe	29
6c6ed1e2	30	void tmc_wait_for_tmcready(struct tmc_drvdata *drvdata)
bc4bf7fe PP	31	{
	32	/* Ensure formatter, unformatter and hardware fifo are empty */
	33	if (coresight_timeout(drvdata->base,
580ff804	34	TMC_STS, TMC_STS_TMCREADY_BIT, 1)) {
9dd0a920	35	dev_err(&drvdata->csdev->dev,
67337e8d	36	"timeout while waiting for TMC to be Ready\n");
bc4bf7fe PP	37	}
	38	}
	39
6c6ed1e2	40	void tmc_flush_and_stop(struct tmc_drvdata *drvdata)
bc4bf7fe PP	41	{
	42	u32 ffcr;
	43
	44	ffcr = readl_relaxed(drvdata->base + TMC_FFCR);
	45	ffcr \|= TMC_FFCR_STOP_ON_FLUSH;
	46	writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
a8ab4268	47	ffcr \|= BIT(TMC_FFCR_FLUSHMAN_BIT);
bc4bf7fe PP	48	writel_relaxed(ffcr, drvdata->base + TMC_FFCR);
	49	/* Ensure flush completes */
	50	if (coresight_timeout(drvdata->base,
	51	TMC_FFCR, TMC_FFCR_FLUSHMAN_BIT, 0)) {
9dd0a920	52	dev_err(&drvdata->csdev->dev,
67337e8d	53	"timeout while waiting for completion of Manual Flush\n");
bc4bf7fe PP	54	}
bc4bf7fe PP	55
580ff804	56	tmc_wait_for_tmcready(drvdata);
bc4bf7fe PP	57	}
bc4bf7fe PP	58
6c6ed1e2	59	void tmc_enable_hw(struct tmc_drvdata *drvdata)
bc4bf7fe PP	60	{
	61	writel_relaxed(TMC_CTL_CAPT_EN, drvdata->base + TMC_CTL);
	62	}
	63
6c6ed1e2	64	void tmc_disable_hw(struct tmc_drvdata *drvdata)
bc4bf7fe PP	65	{
	66	writel_relaxed(0x0, drvdata->base + TMC_CTL);
	67	}
	68
bc4bf7fe PP	69	static int tmc_read_prepare(struct tmc_drvdata *drvdata)
bc4bf7fe PP	70	{
b1789b79	71	int ret = 0;
bc4bf7fe	72
b1789b79 MP	73	switch (drvdata->config_type) {
b1789b79 MP	74	case TMC_CONFIG_TYPE_ETB:
b1789b79	75	case TMC_CONFIG_TYPE_ETF:
4525412a	76	ret = tmc_read_prepare_etb(drvdata);
b1789b79 MP	77	break;
b1789b79 MP	78	case TMC_CONFIG_TYPE_ETR:
4525412a	79	ret = tmc_read_prepare_etr(drvdata);
b1789b79 MP	80	break;
	81	default:
	82	ret = -EINVAL;
bc4bf7fe	83	}
b1789b79	84
4525412a	85	if (!ret)
9dd0a920	86	dev_dbg(&drvdata->csdev->dev, "TMC read start\n");
4525412a	87
bc4bf7fe PP	88	return ret;
	89	}
	90
f74debbe	91	static int tmc_read_unprepare(struct tmc_drvdata *drvdata)
bc4bf7fe	92	{
4525412a	93	int ret = 0;
bc4bf7fe	94
b1789b79 MP	95	switch (drvdata->config_type) {
b1789b79 MP	96	case TMC_CONFIG_TYPE_ETB:
b1789b79	97	case TMC_CONFIG_TYPE_ETF:
4525412a	98	ret = tmc_read_unprepare_etb(drvdata);
b1789b79 MP	99	break;
b1789b79 MP	100	case TMC_CONFIG_TYPE_ETR:
4525412a	101	ret = tmc_read_unprepare_etr(drvdata);
b1789b79 MP	102	break;
b1789b79 MP	103	default:
4525412a	104	ret = -EINVAL;
bc4bf7fe	105	}
b1789b79	106
4525412a	107	if (!ret)
9dd0a920	108	dev_dbg(&drvdata->csdev->dev, "TMC read end\n");
f74debbe MP	109
f74debbe MP	110	return ret;
bc4bf7fe PP	111	}
	112
	113	static int tmc_open(struct inode inode, struct file file)
	114	{
f74debbe	115	int ret;
bc4bf7fe PP	116	struct tmc_drvdata *drvdata = container_of(file->private_data,
bc4bf7fe PP	117	struct tmc_drvdata, miscdev);
bc4bf7fe PP	118
	119	ret = tmc_read_prepare(drvdata);
	120	if (ret)
	121	return ret;
f74debbe	122
bc4bf7fe PP	123	nonseekable_open(inode, file);
bc4bf7fe PP	124
9dd0a920	125	dev_dbg(&drvdata->csdev->dev, "%s: successfully opened\n", __func__);
bc4bf7fe PP	126	return 0;
	127	}
	128
3495722a SP	129	static inline ssize_t tmc_get_sysfs_trace(struct tmc_drvdata *drvdata,
	130	loff_t pos, size_t len, char **bufpp)
	131	{
	132	switch (drvdata->config_type) {
	133	case TMC_CONFIG_TYPE_ETB:
	134	case TMC_CONFIG_TYPE_ETF:
	135	return tmc_etb_get_sysfs_trace(drvdata, pos, len, bufpp);
	136	case TMC_CONFIG_TYPE_ETR:
	137	return tmc_etr_get_sysfs_trace(drvdata, pos, len, bufpp);
	138	}
	139
	140	return -EINVAL;
	141	}
	142
bc4bf7fe PP	143	static ssize_t tmc_read(struct file file, char __user data, size_t len,
	144	loff_t *ppos)
	145	{
3495722a SP	146	char *bufp;
3495722a SP	147	ssize_t actual;
bc4bf7fe PP	148	struct tmc_drvdata *drvdata = container_of(file->private_data,
bc4bf7fe PP	149	struct tmc_drvdata, miscdev);
3495722a SP	150	actual = tmc_get_sysfs_trace(drvdata, *ppos, len, &bufp);
	151	if (actual <= 0)
	152	return 0;
bc4bf7fe	153
3495722a	154	if (copy_to_user(data, bufp, actual)) {
9dd0a920 SP	155	dev_dbg(&drvdata->csdev->dev,
9dd0a920 SP	156	"%s: copy_to_user failed\n", __func__);
bc4bf7fe PP	157	return -EFAULT;
	158	}
	159
3495722a	160	*ppos += actual;
9dd0a920	161	dev_dbg(&drvdata->csdev->dev, "%zu bytes copied\n", actual);
bc4bf7fe	162
3495722a	163	return actual;
bc4bf7fe PP	164	}
	165
	166	static int tmc_release(struct inode inode, struct file file)
	167	{
f74debbe	168	int ret;
bc4bf7fe PP	169	struct tmc_drvdata *drvdata = container_of(file->private_data,
	170	struct tmc_drvdata, miscdev);
	171
f74debbe MP	172	ret = tmc_read_unprepare(drvdata);
	173	if (ret)
	174	return ret;
bc4bf7fe	175
9dd0a920	176	dev_dbg(&drvdata->csdev->dev, "%s: released\n", __func__);
bc4bf7fe PP	177	return 0;
	178	}
	179
	180	static const struct file_operations tmc_fops = {
	181	.owner = THIS_MODULE,
	182	.open = tmc_open,
	183	.read = tmc_read,
	184	.release = tmc_release,
	185	.llseek = no_llseek,
	186	};
	187
4f1ff3de MP	188	static enum tmc_mem_intf_width tmc_get_memwidth(u32 devid)
	189	{
	190	enum tmc_mem_intf_width memwidth;
	191
	192	/*
	193	* Excerpt from the TRM:
	194	*
	195	* DEVID::MEMWIDTH[10:8]
	196	* 0x2 Memory interface databus is 32 bits wide.
	197	* 0x3 Memory interface databus is 64 bits wide.
	198	* 0x4 Memory interface databus is 128 bits wide.
	199	* 0x5 Memory interface databus is 256 bits wide.
	200	*/
	201	switch (BMVAL(devid, 8, 10)) {
	202	case 0x2:
	203	memwidth = TMC_MEM_INTF_WIDTH_32BITS;
	204	break;
	205	case 0x3:
	206	memwidth = TMC_MEM_INTF_WIDTH_64BITS;
	207	break;
	208	case 0x4:
	209	memwidth = TMC_MEM_INTF_WIDTH_128BITS;
	210	break;
	211	case 0x5:
	212	memwidth = TMC_MEM_INTF_WIDTH_256BITS;
	213	break;
	214	default:
	215	memwidth = 0;
	216	}
	217
	218	return memwidth;
	219	}
	220
47675f6a SP	221	#define coresight_tmc_reg(name, offset) \
	222	coresight_simple_reg32(struct tmc_drvdata, name, offset)
	223	#define coresight_tmc_reg64(name, lo_off, hi_off) \
	224	coresight_simple_reg64(struct tmc_drvdata, name, lo_off, hi_off)
	225
	226	coresight_tmc_reg(rsz, TMC_RSZ);
	227	coresight_tmc_reg(sts, TMC_STS);
	228	coresight_tmc_reg(trg, TMC_TRG);
	229	coresight_tmc_reg(ctl, TMC_CTL);
	230	coresight_tmc_reg(ffsr, TMC_FFSR);
	231	coresight_tmc_reg(ffcr, TMC_FFCR);
	232	coresight_tmc_reg(mode, TMC_MODE);
	233	coresight_tmc_reg(pscr, TMC_PSCR);
2b455339	234	coresight_tmc_reg(axictl, TMC_AXICTL);
47675f6a SP	235	coresight_tmc_reg(devid, CORESIGHT_DEVID);
	236	coresight_tmc_reg64(rrp, TMC_RRP, TMC_RRPHI);
	237	coresight_tmc_reg64(rwp, TMC_RWP, TMC_RWPHI);
2b455339	238	coresight_tmc_reg64(dba, TMC_DBALO, TMC_DBAHI);
7d83d177 MP	239
	240	static struct attribute *coresight_tmc_mgmt_attrs[] = {
	241	&dev_attr_rsz.attr,
	242	&dev_attr_sts.attr,
	243	&dev_attr_rrp.attr,
	244	&dev_attr_rwp.attr,
	245	&dev_attr_trg.attr,
	246	&dev_attr_ctl.attr,
	247	&dev_attr_ffsr.attr,
	248	&dev_attr_ffcr.attr,
	249	&dev_attr_mode.attr,
	250	&dev_attr_pscr.attr,
	251	&dev_attr_devid.attr,
2b455339 SP	252	&dev_attr_dba.attr,
2b455339 SP	253	&dev_attr_axictl.attr,
7d83d177 MP	254	NULL,
7d83d177 MP	255	};
a2d6e184	256
0ef7528d BX	257	static ssize_t trigger_cntr_show(struct device *dev,
0ef7528d BX	258	struct device_attribute attr, char buf)
bc4bf7fe PP	259	{
	260	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
	261	unsigned long val = drvdata->trigger_cntr;
	262
	263	return sprintf(buf, "%#lx\n", val);
	264	}
	265
	266	static ssize_t trigger_cntr_store(struct device *dev,
	267	struct device_attribute *attr,
	268	const char *buf, size_t size)
	269	{
	270	int ret;
	271	unsigned long val;
	272	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
	273
	274	ret = kstrtoul(buf, 16, &val);
	275	if (ret)
	276	return ret;
	277
	278	drvdata->trigger_cntr = val;
	279	return size;
	280	}
	281	static DEVICE_ATTR_RW(trigger_cntr);
	282
c34cc23f SP	283	static ssize_t buffer_size_show(struct device *dev,
	284	struct device_attribute attr, char buf)
	285	{
	286	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
	287
	288	return sprintf(buf, "%#x\n", drvdata->size);
	289	}
	290
	291	static ssize_t buffer_size_store(struct device *dev,
	292	struct device_attribute *attr,
	293	const char *buf, size_t size)
	294	{
	295	int ret;
	296	unsigned long val;
	297	struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent);
	298
	299	/* Only permitted for TMC-ETRs */
	300	if (drvdata->config_type != TMC_CONFIG_TYPE_ETR)
	301	return -EPERM;
	302
	303	ret = kstrtoul(buf, 0, &val);
	304	if (ret)
	305	return ret;
	306	/* The buffer size should be page aligned */
	307	if (val & (PAGE_SIZE - 1))
	308	return -EINVAL;
	309	drvdata->size = val;
	310	return size;
	311	}
	312
	313	static DEVICE_ATTR_RW(buffer_size);
	314
7d83d177	315	static struct attribute *coresight_tmc_attrs[] = {
bc4bf7fe	316	&dev_attr_trigger_cntr.attr,
c34cc23f	317	&dev_attr_buffer_size.attr,
bc4bf7fe PP	318	NULL,
bc4bf7fe PP	319	};
bc4bf7fe	320
7d83d177 MP	321	static const struct attribute_group coresight_tmc_group = {
7d83d177 MP	322	.attrs = coresight_tmc_attrs,
bc4bf7fe	323	};
bc4bf7fe	324
7d83d177 MP	325	static const struct attribute_group coresight_tmc_mgmt_group = {
	326	.attrs = coresight_tmc_mgmt_attrs,
	327	.name = "mgmt",
	328	};
	329
	330	const struct attribute_group *coresight_tmc_groups[] = {
	331	&coresight_tmc_group,
	332	&coresight_tmc_mgmt_group,
bc4bf7fe PP	333	NULL,
bc4bf7fe PP	334	};
bc4bf7fe	335
9dd0a920	336	static inline bool tmc_etr_can_use_sg(struct device *dev)
ed2cfb2b	337	{
9dd0a920	338	return fwnode_property_present(dev->fwnode, "arm,scatter-gather");
ed2cfb2b SP	339	}
ed2cfb2b SP	340
2884132a	341	/* Detect and initialise the capabilities of a TMC ETR */
9dd0a920	342	static int tmc_etr_setup_caps(struct device parent, u32 devid, void dev_caps)
2884132a	343	{
08be8747	344	int rc;
ff11f5bc	345	u32 dma_mask = 0;
9dd0a920	346	struct tmc_drvdata *drvdata = dev_get_drvdata(parent);
ff11f5bc	347
2884132a SP	348	/* Set the unadvertised capabilities */
	349	tmc_etr_init_caps(drvdata, (u32)(unsigned long)dev_caps);
	350
9dd0a920	351	if (!(devid & TMC_DEVID_NOSCAT) && tmc_etr_can_use_sg(parent))
2e219345	352	tmc_etr_set_cap(drvdata, TMC_ETR_SG);
ff11f5bc SP	353
	354	/* Check if the AXI address width is available */
	355	if (devid & TMC_DEVID_AXIAW_VALID)
	356	dma_mask = ((devid >> TMC_DEVID_AXIAW_SHIFT) &
	357	TMC_DEVID_AXIAW_MASK);
	358
2884132a	359	/*
ff11f5bc SP	360	* Unless specified in the device configuration, ETR uses a 40-bit
ff11f5bc SP	361	* AXI master in place of the embedded SRAM of ETB/ETF.
2884132a	362	*/
ff11f5bc SP	363	switch (dma_mask) {
	364	case 32:
	365	case 40:
	366	case 44:
	367	case 48:
	368	case 52:
9dd0a920	369	dev_info(parent, "Detected dma mask %dbits\n", dma_mask);
ff11f5bc SP	370	break;
	371	default:
	372	dma_mask = 40;
	373	}
	374
9dd0a920	375	rc = dma_set_mask_and_coherent(parent, DMA_BIT_MASK(dma_mask));
08be8747	376	if (rc)
9dd0a920	377	dev_err(parent, "Failed to setup DMA mask: %d\n", rc);
08be8747	378	return rc;
2884132a SP	379	}
2884132a SP	380
538eca25 SP	381	static u32 tmc_etr_get_default_buffer_size(struct device *dev)
	382	{
	383	u32 size;
	384
	385	if (fwnode_property_read_u32(dev->fwnode, "arm,buffer-size", &size))
	386	size = SZ_1M;
	387	return size;
	388	}
	389
bc4bf7fe PP	390	static int tmc_probe(struct amba_device adev, const struct amba_id id)
	391	{
	392	int ret = 0;
	393	u32 devid;
	394	void __iomem *base;
	395	struct device *dev = &adev->dev;
	396	struct coresight_platform_data *pdata = NULL;
	397	struct tmc_drvdata *drvdata;
	398	struct resource *res = &adev->res;
9486295a	399	struct coresight_desc desc = { 0 };
f03631da	400
3afd0634	401	ret = -ENOMEM;
bc4bf7fe PP	402	drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
bc4bf7fe PP	403	if (!drvdata)
3afd0634 SP	404	goto out;
3afd0634 SP	405
bc4bf7fe PP	406	dev_set_drvdata(dev, drvdata);
	407
	408	/* Validity for the resource is already checked by the AMBA core */
	409	base = devm_ioremap_resource(dev, res);
3afd0634 SP	410	if (IS_ERR(base)) {
	411	ret = PTR_ERR(base);
	412	goto out;
	413	}
bc4bf7fe PP	414
	415	drvdata->base = base;
	416
	417	spin_lock_init(&drvdata->spinlock);
	418
bc4bf7fe PP	419	devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
bc4bf7fe PP	420	drvdata->config_type = BMVAL(devid, 6, 7);
4f1ff3de	421	drvdata->memwidth = tmc_get_memwidth(devid);
8d03cfd1 MP	422	/* This device is not associated with a session */
8d03cfd1 MP	423	drvdata->pid = -1;
bc4bf7fe	424
538eca25 SP	425	if (drvdata->config_type == TMC_CONFIG_TYPE_ETR)
	426	drvdata->size = tmc_etr_get_default_buffer_size(dev);
	427	else
bc4bf7fe	428	drvdata->size = readl_relaxed(drvdata->base + TMC_RSZ) * 4;
bc4bf7fe	429
9486295a SP	430	desc.dev = dev;
9486295a SP	431	desc.groups = coresight_tmc_groups;
2ede79a6	432	desc.name = dev_name(dev);
bc4bf7fe	433
99ac6f12 SP	434	switch (drvdata->config_type) {
99ac6f12 SP	435	case TMC_CONFIG_TYPE_ETB:
9486295a SP	436	desc.type = CORESIGHT_DEV_TYPE_SINK;
	437	desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
	438	desc.ops = &tmc_etb_cs_ops;
99ac6f12 SP	439	break;
99ac6f12 SP	440	case TMC_CONFIG_TYPE_ETR:
9486295a SP	441	desc.type = CORESIGHT_DEV_TYPE_SINK;
	442	desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER;
	443	desc.ops = &tmc_etr_cs_ops;
9dd0a920	444	ret = tmc_etr_setup_caps(dev, devid,
e85fa28e	445	coresight_get_uci_data(id));
a3959c50 RM	446	if (ret)
a3959c50 RM	447	goto out;
c5ff7344 MP	448	idr_init(&drvdata->idr);
c5ff7344 MP	449	mutex_init(&drvdata->idr_mutex);
99ac6f12 SP	450	break;
99ac6f12 SP	451	case TMC_CONFIG_TYPE_ETF:
9486295a SP	452	desc.type = CORESIGHT_DEV_TYPE_LINKSINK;
	453	desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO;
	454	desc.ops = &tmc_etf_cs_ops;
99ac6f12 SP	455	break;
99ac6f12 SP	456	default:
2ede79a6	457	pr_err("%s: Unsupported TMC config\n", desc.name);
99ac6f12 SP	458	ret = -EINVAL;
99ac6f12 SP	459	goto out;
bc4bf7fe PP	460	}
bc4bf7fe PP	461
af7cfd0f SP	462	pdata = coresight_get_platform_data(dev);
	463	if (IS_ERR(pdata)) {
	464	ret = PTR_ERR(pdata);
	465	goto out;
	466	}
	467	adev->dev.platform_data = pdata;
	468	desc.pdata = pdata;
	469
9486295a	470	drvdata->csdev = coresight_register(&desc);
bc4bf7fe PP	471	if (IS_ERR(drvdata->csdev)) {
bc4bf7fe PP	472	ret = PTR_ERR(drvdata->csdev);
3afd0634	473	goto out;
bc4bf7fe PP	474	}
bc4bf7fe PP	475
2ede79a6	476	drvdata->miscdev.name = desc.name;
bc4bf7fe PP	477	drvdata->miscdev.minor = MISC_DYNAMIC_MINOR;
	478	drvdata->miscdev.fops = &tmc_fops;
	479	ret = misc_register(&drvdata->miscdev);
	480	if (ret)
3afd0634	481	coresight_unregister(drvdata->csdev);
26355695 SP	482	else
26355695 SP	483	pm_runtime_put(&adev->dev);
3afd0634	484	out:
bc4bf7fe PP	485	return ret;
	486	}
	487
6f964e7c	488	static const struct amba_id tmc_ids[] = {
e85fa28e ML	489	CS_AMBA_ID(0x000bb961),
	490	/* Coresight SoC 600 TMC-ETR/ETS */
	491	CS_AMBA_ID_DATA(0x000bb9e8, (unsigned long)CORESIGHT_SOC_600_ETR_CAPS),
	492	/* Coresight SoC 600 TMC-ETB */
	493	CS_AMBA_ID(0x000bb9e9),
	494	/* Coresight SoC 600 TMC-ETF */
	495	CS_AMBA_ID(0x000bb9ea),
bc4bf7fe PP	496	{ 0, 0},
	497	};
	498
	499	static struct amba_driver tmc_driver = {
	500	.drv = {
	501	.name = "coresight-tmc",
	502	.owner = THIS_MODULE,
b15f0fb6	503	.suppress_bind_attrs = true,
bc4bf7fe PP	504	},
bc4bf7fe PP	505	.probe = tmc_probe,
bc4bf7fe PP	506	.id_table = tmc_ids,
bc4bf7fe PP	507	};
941943cf	508	builtin_amba_driver(tmc_driver);