// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
*
* Description: CoreSight Trace Port Interface Unit driver
*/
#include <linux/acpi.h>
#include <linux/amba/bus.h>
#include <linux/atomic.h>
#include <linux/clk.h>
#include <linux/coresight.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include "coresight-priv.h"
#define TPIU_SUPP_PORTSZ 0x000
#define TPIU_CURR_PORTSZ 0x004
#define TPIU_SUPP_TRIGMODES 0x100
#define TPIU_TRIG_CNTRVAL 0x104
#define TPIU_TRIG_MULT 0x108
#define TPIU_SUPP_TESTPATM 0x200
#define TPIU_CURR_TESTPATM 0x204
#define TPIU_TEST_PATREPCNTR 0x208
#define TPIU_FFSR 0x300
#define TPIU_FFCR 0x304
#define TPIU_FSYNC_CNTR 0x308
#define TPIU_EXTCTL_INPORT 0x400
#define TPIU_EXTCTL_OUTPORT 0x404
#define TPIU_ITTRFLINACK 0xee4
#define TPIU_ITTRFLIN 0xee8
#define TPIU_ITATBDATA0 0xeec
#define TPIU_ITATBCTR2 0xef0
#define TPIU_ITATBCTR1 0xef4
#define TPIU_ITATBCTR0 0xef8
/** register definition **/
/* FFSR - 0x300 */
#define FFSR_FT_STOPPED_BIT 1
/* FFCR - 0x304 */
#define FFCR_FON_MAN_BIT 6
#define FFCR_FON_MAN BIT(6)
#define FFCR_STOP_FI BIT(12)
DEFINE_CORESIGHT_DEVLIST(tpiu_devs, "tpiu");
/*
* @base: memory mapped base address for this component.
* @atclk: optional clock for the core parts of the TPIU.
* @pclk: APB clock if present, otherwise NULL
* @csdev: component vitals needed by the framework.
*/
struct tpiu_drvdata {
void __iomem *base;
struct clk *atclk;
struct clk *pclk;
struct coresight_device *csdev;
spinlock_t spinlock;
};
static void tpiu_enable_hw(struct csdev_access *csa)
{
CS_UNLOCK(csa->base);
/* TODO: fill this up */
CS_LOCK(csa->base);
}
static int tpiu_enable(struct coresight_device *csdev, enum cs_mode mode,
void *__unused)
{
struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
guard(spinlock)(&drvdata->spinlock);
tpiu_enable_hw(&csdev->access);
csdev->refcnt++;
dev_dbg(&csdev->dev, "TPIU enabled\n");
return 0;
}
static void tpiu_disable_hw(struct csdev_access *csa)
{
CS_UNLOCK(csa->base);
/* Clear formatter and stop on flush */
csdev_access_relaxed_write32(csa, FFCR_STOP_FI, TPIU_FFCR);
/* Generate manual flush */
csdev_access_relaxed_write32(csa, FFCR_STOP_FI | FFCR_FON_MAN, TPIU_FFCR);
/* Wait for flush to complete */
coresight_timeout(csa, TPIU_FFCR, FFCR_FON_MAN_BIT, 0);
/* Wait for formatter to stop */
coresight_timeout(csa, TPIU_FFSR, FFSR_FT_STOPPED_BIT, 1);
CS_LOCK(csa->base);
}
static int tpiu_disable(struct coresight_device *csdev)
{
struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
guard(spinlock)(&drvdata->spinlock);
csdev->refcnt--;
if (csdev->refcnt)
return -EBUSY;
tpiu_disable_hw(&csdev->access);
dev_dbg(&csdev->dev, "TPIU disabled\n");
return 0;
}
static const struct coresight_ops_sink tpiu_sink_ops = {
.enable = tpiu_enable,
.disable = tpiu_disable,
};
static const struct coresight_ops tpiu_cs_ops = {
.sink_ops = &tpiu_sink_ops,
};
static int __tpiu_probe(struct device *dev, struct resource *res)
{
int ret;
void __iomem *base;
struct coresight_platform_data *pdata = NULL;
struct tpiu_drvdata *drvdata;
struct coresight_desc desc = { 0 };
desc.name = coresight_alloc_device_name(&tpiu_devs, dev);
if (!desc.name)
return -ENOMEM;
drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
if (!drvdata)
return -ENOMEM;
spin_lock_init(&drvdata->spinlock);
drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
if (!IS_ERR(drvdata->atclk)) {
ret = clk_prepare_enable(drvdata->atclk);
if (ret)
return ret;
}
drvdata->pclk = coresight_get_enable_apb_pclk(dev);
if (IS_ERR(drvdata->pclk))
return -ENODEV;
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))
return PTR_ERR(base);
drvdata->base = base;
desc.access = CSDEV_ACCESS_IOMEM(base);
/* Disable tpiu to support older devices */
tpiu_disable_hw(&desc.access);
pdata = coresight_get_platform_data(dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
dev->platform_data = pdata;
desc.type = CORESIGHT_DEV_TYPE_SINK;
desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_PORT;
desc.ops = &tpiu_cs_ops;
desc.pdata = pdata;
desc.dev = dev;
drvdata->csdev = coresight_register(&desc);
if (!IS_ERR(drvdata->csdev))
return 0;
return PTR_ERR(drvdata->csdev);
}
static int tpiu_probe(struct amba_device *adev, const struct amba_id *id)
{
int ret;
ret = __tpiu_probe(&adev->dev, &adev->res);
if (!ret)
pm_runtime_put(&adev->dev);
return ret;
}
static void __tpiu_remove(struct device *dev)
{
struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
coresight_unregister(drvdata->csdev);
}
static void tpiu_remove(struct amba_device *adev)
{
__tpiu_remove(&adev->dev);
}
#ifdef CONFIG_PM
static int tpiu_runtime_suspend(struct device *dev)
{
struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata && !IS_ERR(drvdata->atclk))
clk_disable_unprepare(drvdata->atclk);
if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
clk_disable_unprepare(drvdata->pclk);
return 0;
}
static int tpiu_runtime_resume(struct device *dev)
{
struct tpiu_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata && !IS_ERR(drvdata->atclk))
clk_prepare_enable(drvdata->atclk);
if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
clk_prepare_enable(drvdata->pclk);
return 0;
}
#endif
static const struct dev_pm_ops tpiu_dev_pm_ops = {
SET_RUNTIME_PM_OPS(tpiu_runtime_suspend, tpiu_runtime_resume, NULL)
};
static const struct amba_id tpiu_ids[] = {
{
.id = 0x000bb912,
.mask = 0x000fffff,
},
{
.id = 0x0004b912,
.mask = 0x0007ffff,
},
{
/* Coresight SoC-600 */
.id = 0x000bb9e7,
.mask = 0x000fffff,
},
{ 0, 0, NULL },
};
MODULE_DEVICE_TABLE(amba, tpiu_ids);
static struct amba_driver tpiu_driver = {
.drv = {
.name = "coresight-tpiu",
.pm = &tpiu_dev_pm_ops,
.suppress_bind_attrs = true,
},
.probe = tpiu_probe,
.remove = tpiu_remove,
.id_table = tpiu_ids,
};
static int tpiu_platform_probe(struct platform_device *pdev)
{
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
int ret;
pm_runtime_get_noresume(&pdev->dev);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
ret = __tpiu_probe(&pdev->dev, res);
pm_runtime_put(&pdev->dev);
if (ret)
pm_runtime_disable(&pdev->dev);
return ret;
}
static void tpiu_platform_remove(struct platform_device *pdev)
{
struct tpiu_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
if (WARN_ON(!drvdata))
return;
__tpiu_remove(&pdev->dev);
pm_runtime_disable(&pdev->dev);
if (!IS_ERR_OR_NULL(drvdata->pclk))
clk_put(drvdata->pclk);
}
#ifdef CONFIG_ACPI
static const struct acpi_device_id tpiu_acpi_ids[] = {
{"ARMHC979", 0, 0, 0}, /* ARM CoreSight TPIU */
{}
};
MODULE_DEVICE_TABLE(acpi, tpiu_acpi_ids);
#endif
static struct platform_driver tpiu_platform_driver = {
.probe = tpiu_platform_probe,
.remove_new = tpiu_platform_remove,
.driver = {
.name = "coresight-tpiu-platform",
.acpi_match_table = ACPI_PTR(tpiu_acpi_ids),
.suppress_bind_attrs = true,
.pm = &tpiu_dev_pm_ops,
},
};
static int __init tpiu_init(void)
{
return coresight_init_driver("tpiu", &tpiu_driver, &tpiu_platform_driver);
}
static void __exit tpiu_exit(void)
{
coresight_remove_driver(&tpiu_driver, &tpiu_platform_driver);
}
module_init(tpiu_init);
module_exit(tpiu_exit);
MODULE_AUTHOR("Pratik Patel <[email protected]>");
MODULE_AUTHOR("Mathieu Poirier <[email protected]>");
MODULE_DESCRIPTION("Arm CoreSight TPIU (Trace Port Interface Unit) driver");
MODULE_LICENSE("GPL v2");
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