[RFC PATCH 03/11] coresight: add CoreSight TPIU driver
mathieu.poirier at linaro.org
mathieu.poirier at linaro.org
Fri May 30 06:43:03 PDT 2014
From: Pratik Patel <pratikp at 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 at codeaurora.org>
Signed-off-by: Panchaxari Prasannamurthy <panchaxari.prasannamurthy at linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier at linaro.org>
---
drivers/coresight/Makefile | 2 +-
drivers/coresight/coresight-tpiu.c | 229 +++++++++++++++++++++++++++++++++++++
2 files changed, 230 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..b552d1e
--- /dev/null
+++ b/drivers/coresight/coresight-tpiu.c
@@ -0,0 +1,229 @@
+/* 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/platform_device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/of_coresight.h>
+#include <linux/coresight.h>
+
+#include "coresight-priv.h"
+
+#define tpiu_writel(drvdata, val, off) __raw_writel((val), drvdata->base + off)
+#define tpiu_readl(drvdata, off) __raw_readl(drvdata->base + off)
+
+#define TPIU_LOCK(drvdata) \
+do { \
+ /* wait for things to settle */ \
+ mb(); \
+ tpiu_writel(drvdata, 0x0, CORESIGHT_LAR); \
+} while (0)
+#define TPIU_UNLOCK(drvdata) \
+do { \
+ tpiu_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \
+ /* make sure everyone has seen this */ \
+ mb(); \
+} while (0)
+
+#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)
+
+struct tpiu_drvdata {
+ void __iomem *base;
+ struct device *dev;
+ struct coresight_device *csdev;
+ struct clk *clk;
+};
+
+static void __tpiu_enable(struct tpiu_drvdata *drvdata)
+{
+ TPIU_UNLOCK(drvdata);
+
+ /* TODO: fill this up */
+
+ TPIU_LOCK(drvdata);
+}
+
+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(drvdata);
+
+ dev_info(drvdata->dev, "TPIU enabled\n");
+ return 0;
+}
+
+static void __tpiu_disable(struct tpiu_drvdata *drvdata)
+{
+ TPIU_UNLOCK(drvdata);
+
+ tpiu_writel(drvdata, 0x3000, TPIU_FFCR);
+ tpiu_writel(drvdata, 0x3040, TPIU_FFCR);
+
+ TPIU_LOCK(drvdata);
+}
+
+static void tpiu_disable(struct coresight_device *csdev)
+{
+ struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ __tpiu_disable(drvdata);
+
+ clk_disable_unprepare(drvdata->clk);
+
+ dev_info(drvdata->dev, "TPIU disabled\n");
+}
+
+static void tpiu_abort(struct coresight_device *csdev)
+{
+ struct tpiu_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ __tpiu_disable(drvdata);
+
+ dev_info(drvdata->dev, "TPIU aborted\n");
+}
+
+static const struct coresight_ops_sink tpiu_sink_ops = {
+ .enable = tpiu_enable,
+ .disable = tpiu_disable,
+ .abort = tpiu_abort,
+};
+
+static const struct coresight_ops tpiu_cs_ops = {
+ .sink_ops = &tpiu_sink_ops,
+};
+
+static int tpiu_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct device *dev = &pdev->dev;
+ struct coresight_platform_data *pdata = NULL;
+ struct tpiu_drvdata *drvdata;
+ struct resource *res;
+ struct coresight_desc *desc;
+
+ if (pdev->dev.of_node) {
+ 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);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
+ if (!drvdata->base)
+ return -ENOMEM;
+
+ if (pdata && pdata->clk) {
+ drvdata->clk = pdata->clk;
+ ret = clk_prepare_enable(drvdata->clk);
+ if (ret)
+ return ret;
+ }
+
+ /* Disable tpiu to support older devices */
+ __tpiu_disable(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 = pdev->dev.platform_data;
+ desc->dev = &pdev->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 platform_device *pdev)
+{
+ struct tpiu_drvdata *drvdata = platform_get_drvdata(pdev);
+
+ coresight_unregister(drvdata->csdev);
+ return 0;
+}
+
+static struct of_device_id tpiu_match[] = {
+ {.compatible = "arm,coresight-tpiu"},
+ {}
+};
+
+static struct platform_driver tpiu_driver = {
+ .probe = tpiu_probe,
+ .remove = tpiu_remove,
+ .driver = {
+ .name = "coresight-tpiu",
+ .owner = THIS_MODULE,
+ .of_match_table = tpiu_match,
+ },
+};
+
+static int __init tpiu_init(void)
+{
+ return platform_driver_register(&tpiu_driver);
+}
+module_init(tpiu_init);
+
+static void __exit tpiu_exit(void)
+{
+ platform_driver_unregister(&tpiu_driver);
+}
+module_exit(tpiu_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("CoreSight Trace Port Interface Unit driver");
--
1.9.1
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