--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/amba/bus.h>
+#include <linux/bitfield.h>
+#include <linux/coresight.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include "coresight-priv.h"
+#include "coresight-tpda.h"
+#include "coresight-trace-id.h"
+
+DEFINE_CORESIGHT_DEVLIST(tpda_devs, "tpda");
+
+/* Settings pre enabling port control register */
+static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
+{
+ u32 val;
+
+ val = readl_relaxed(drvdata->base + TPDA_CR);
+ val &= ~TPDA_CR_ATID;
+ val |= FIELD_PREP(TPDA_CR_ATID, drvdata->atid);
+ writel_relaxed(val, drvdata->base + TPDA_CR);
+}
+
+static void tpda_enable_port(struct tpda_drvdata *drvdata, int port)
+{
+ u32 val;
+
+ val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
+ /* Enable the port */
+ val |= TPDA_Pn_CR_ENA;
+ writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
+}
+
+static void __tpda_enable(struct tpda_drvdata *drvdata, int port)
+{
+ CS_UNLOCK(drvdata->base);
+
+ if (!drvdata->csdev->enable)
+ tpda_enable_pre_port(drvdata);
+
+ tpda_enable_port(drvdata, port);
+
+ CS_LOCK(drvdata->base);
+}
+
+static int tpda_enable(struct coresight_device *csdev, int inport, int outport)
+{
+ struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ spin_lock(&drvdata->spinlock);
+ if (atomic_read(&csdev->refcnt[inport]) == 0)
+ __tpda_enable(drvdata, inport);
+
+ atomic_inc(&csdev->refcnt[inport]);
+ spin_unlock(&drvdata->spinlock);
+
+ dev_dbg(drvdata->dev, "TPDA inport %d enabled.\n", inport);
+ return 0;
+}
+
+static void __tpda_disable(struct tpda_drvdata *drvdata, int port)
+{
+ u32 val;
+
+ CS_UNLOCK(drvdata->base);
+
+ val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
+ val &= ~TPDA_Pn_CR_ENA;
+ writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
+
+ CS_LOCK(drvdata->base);
+}
+
+static void tpda_disable(struct coresight_device *csdev, int inport,
+ int outport)
+{
+ struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ spin_lock(&drvdata->spinlock);
+ if (atomic_dec_return(&csdev->refcnt[inport]) == 0)
+ __tpda_disable(drvdata, inport);
+
+ spin_unlock(&drvdata->spinlock);
+
+ dev_dbg(drvdata->dev, "TPDA inport %d disabled\n", inport);
+}
+
+static const struct coresight_ops_link tpda_link_ops = {
+ .enable = tpda_enable,
+ .disable = tpda_disable,
+};
+
+static const struct coresight_ops tpda_cs_ops = {
+ .link_ops = &tpda_link_ops,
+};
+
+static int tpda_init_default_data(struct tpda_drvdata *drvdata)
+{
+ int atid;
+ /*
+ * TPDA must has a unique atid. This atid can uniquely
+ * identify the TPDM trace source connected to the TPDA.
+ * The TPDMs which are connected to same TPDA share the
+ * same trace-id. When TPDA does packetization, different
+ * port will have unique channel number for decoding.
+ */
+ atid = coresight_trace_id_get_system_id();
+ if (atid < 0)
+ return atid;
+
+ drvdata->atid = atid;
+ return 0;
+}
+
+static int tpda_probe(struct amba_device *adev, const struct amba_id *id)
+{
+ int ret;
+ struct device *dev = &adev->dev;
+ struct coresight_platform_data *pdata;
+ struct tpda_drvdata *drvdata;
+ struct coresight_desc desc = { 0 };
+ void __iomem *base;
+
+ pdata = coresight_get_platform_data(dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ adev->dev.platform_data = pdata;
+
+ drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
+ if (!drvdata)
+ return -ENOMEM;
+
+ drvdata->dev = &adev->dev;
+ dev_set_drvdata(dev, drvdata);
+
+ base = devm_ioremap_resource(dev, &adev->res);
+ if (!base)
+ return -ENOMEM;
+ drvdata->base = base;
+
+ spin_lock_init(&drvdata->spinlock);
+
+ ret = tpda_init_default_data(drvdata);
+ if (ret)
+ return ret;
+
+ desc.name = coresight_alloc_device_name(&tpda_devs, dev);
+ if (!desc.name)
+ return -ENOMEM;
+ desc.type = CORESIGHT_DEV_TYPE_LINK;
+ desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
+ desc.ops = &tpda_cs_ops;
+ desc.pdata = adev->dev.platform_data;
+ desc.dev = &adev->dev;
+ desc.access = CSDEV_ACCESS_IOMEM(base);
+ drvdata->csdev = coresight_register(&desc);
+ if (IS_ERR(drvdata->csdev))
+ return PTR_ERR(drvdata->csdev);
+
+ pm_runtime_put(&adev->dev);
+
+ dev_dbg(drvdata->dev, "TPDA initialized\n");
+ return 0;
+}
+
+static void __exit tpda_remove(struct amba_device *adev)
+{
+ struct tpda_drvdata *drvdata = dev_get_drvdata(&adev->dev);
+
+ coresight_trace_id_put_system_id(drvdata->atid);
+ coresight_unregister(drvdata->csdev);
+}
+
+/*
+ * Different TPDA has different periph id.
+ * The difference is 0-7 bits' value. So ignore 0-7 bits.
+ */
+static struct amba_id tpda_ids[] = {
+ {
+ .id = 0x000f0f00,
+ .mask = 0x000fff00,
+ },
+ { 0, 0},
+};
+
+static struct amba_driver tpda_driver = {
+ .drv = {
+ .name = "coresight-tpda",
+ .owner = THIS_MODULE,
+ .suppress_bind_attrs = true,
+ },
+ .probe = tpda_probe,
+ .remove = tpda_remove,
+ .id_table = tpda_ids,
+};
+
+module_amba_driver(tpda_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Trace, Profiling & Diagnostic Aggregator driver");
projects / linux.git / commitdiff