[PATCH 03/11 v6] coresight-tpiu: add CoreSight TPIU driver

mathieu.poirier at linaro.org
2014-09-11T15:49:10Z

From: Pratik Patel <pratikp@codeaurora.org>

This driver manages CoreSight TPIU (Trace Port Interface Unit)
which acts as a sink. TPIU is typically connected to some offchip
hardware hosting a storage buffer.

Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
Signed-off-by: Panchaxari Prasannamurthy <panchaxari.prasannamurthy@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
drivers/coresight/Makefile | 2 +-
drivers/coresight/coresight-tpiu.c | 218 +++++++++++++++++++++++++++++++++++++
2 files changed, 219 insertions(+), 1 deletion(-)
create mode 100644 drivers/coresight/coresight-tpiu.c

diff --git a/drivers/coresight/Makefile b/drivers/coresight/Makefile
index 16e26c5..540df99 100644
--- a/drivers/coresight/Makefile
+++ b/drivers/coresight/Makefile
@@ -3,4 +3,4 @@
#
obj-$(CONFIG_CORESIGHT) += coresight.o
obj-$(CONFIG_OF) += of_coresight.o
-obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-tmc.o
+obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-tmc.o coresight-tpiu.o
diff --git a/drivers/coresight/coresight-tpiu.c b/drivers/coresight/coresight-tpiu.c
new file mode 100644
index 0000000..c497afe
--- /dev/null
+++ b/drivers/coresight/coresight-tpiu.c
@@ -0,0 +1,218 @@
+/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
+ *
+ * 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/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/coresight.h>
+#include <linux/amba/bus.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 **/
+/* FFCR - 0x304 */
+#define FFCR_FON_MAN BIT(6)
+
+/**
+ * @base: memory mapped base address for this component.
+ * @dev: the device entity associated to this component.
+ * @csdev: component vitals needed by the framework.
+ * @clk: the clock this component is associated to.
+ */
+struct tpiu_drvdata {
+ void __iomem *base;
+ struct device *dev;
+ struct coresight_device *csdev;
+ struct clk *clk;
+};
+
+static void tpiu_enable_hw(struct tpiu_drvdata *drvdata)
+{
+ CS_UNLOCK(drvdata->base);
+
+ /* TODO: fill this up */
+
+ CS_LOCK(drvdata->base);
+}
+
+static int tpiu_enable(struct coresight_device *csdev)
+{
+ struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+ int ret;
+
+ ret = clk_prepare_enable(drvdata->clk);
+ if (ret)
+ return ret;
+
+ tpiu_enable_hw(drvdata);
+
+ dev_info(drvdata->dev, "TPIU enabled\n");
+ return 0;
+}
+
+static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
+{
+ CS_UNLOCK(drvdata->base);
+
+ /* clear formatter controle reg. */
+ writel_relaxed(0x0, drvdata->base + TPIU_FFCR);
+ /* generate manual flush */
+ writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
+
+ CS_LOCK(drvdata->base);
+}
+
+static void tpiu_disable(struct coresight_device *csdev)
+{
+ struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ tpiu_disable_hw(drvdata);
+
+ clk_disable_unprepare(drvdata->clk);
+
+ dev_info(drvdata->dev, "TPIU disabled\n");
+}
+
+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 amba_device *adev, const struct amba_id *id)
+{
+ int ret;
+ void __iomem *base;
+ struct device *dev = &adev->dev;
+ struct coresight_platform_data *pdata = NULL;
+ struct tpiu_drvdata *drvdata;
+ struct resource *res = &adev->res;
+ struct coresight_desc *desc;
+ struct device_node *np = adev->dev.of_node;
+
+ if (np) {
+ pdata = of_get_coresight_platform_data(dev, np);
+ 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);
+
+ /* 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;
+
+ drvdata->clk = adev->pclk;
+ ret = clk_prepare_enable(drvdata->clk);
+ if (ret)
+ return ret;
+
+ /* Disable tpiu to support older devices */
+ tpiu_disable_hw(drvdata);
+
+ clk_disable_unprepare(drvdata->clk);
+
+ desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+
+ 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;
+ desc->owner = THIS_MODULE;
+ drvdata->csdev = coresight_register(desc);
+ if (IS_ERR(drvdata->csdev))
+ return PTR_ERR(drvdata->csdev);
+
+ dev_info(dev, "TPIU initialized\n");
+ return 0;
+}
+
+static int tpiu_remove(struct amba_device *adev)
+{
+ struct tpiu_drvdata *drvdata = amba_get_drvdata(adev);
+
+ coresight_unregister(drvdata->csdev);
+ return 0;
+}
+
+static struct amba_id tpiu_ids[] = {
+ {
+ .id = 0x0003b912,
+ .mask = 0x0003ffff,
+ },
+ { 0, 0},
+};
+
+static struct amba_driver tpiu_driver = {
+ .drv = {
+ .name = "coresight-tpiu",
+ .owner = THIS_MODULE,
+ },
+ .probe = tpiu_probe,
+ .remove = tpiu_remove,
+ .id_table = tpiu_ids,
+};
+
+static int __init tpiu_init(void)
+{
+ return amba_driver_register(&tpiu_driver);
+}
+module_init(tpiu_init);
+
+static void __exit tpiu_exit(void)
+{
+ amba_driver_unregister(&tpiu_driver);
+}
+module_exit(tpiu_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver");
--
1.9.1