[RFC PATCH 05/11] coresight: add CoreSight Funnel driver
mathieu.poirier at linaro.org
mathieu.poirier at linaro.org
Fri May 30 06:43:05 PDT 2014
From: Pratik Patel <pratikp at codeaurora.org>
This driver manages CoreSight Funnel which acts as a link.
Funnels have multiple input ports (typically 8) each of which
represents an input trace data stream. These multiple input trace
data streams are interleaved into a single output stream coming
out of the Funnel.
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-funnel.c | 310 +++++++++++++++++++++++++++++++++++
2 files changed, 311 insertions(+), 1 deletion(-)
create mode 100644 drivers/coresight/coresight-funnel.c
diff --git a/drivers/coresight/Makefile b/drivers/coresight/Makefile
index 8d4443b..1f66804 100644
--- a/drivers/coresight/Makefile
+++ b/drivers/coresight/Makefile
@@ -4,4 +4,4 @@
obj-$(CONFIG_CORESIGHT) += coresight.o
obj-$(CONFIG_OF) += of_coresight.o
obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-tmc.o coresight-tpiu.o \
- coresight-etb.o
+ coresight-etb.o coresight-funnel.o
diff --git a/drivers/coresight/coresight-funnel.c b/drivers/coresight/coresight-funnel.c
new file mode 100644
index 0000000..c1024df
--- /dev/null
+++ b/drivers/coresight/coresight-funnel.c
@@ -0,0 +1,310 @@
+/* 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/types.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/clk.h>
+#include <linux/of_coresight.h>
+#include <linux/coresight.h>
+
+#include "coresight-priv.h"
+
+#define funnel_writel(drvdata, val, off) \
+ __raw_writel((val), drvdata->base + off)
+#define funnel_readl(drvdata, off) \
+ __raw_readl(drvdata->base + off)
+
+#define FUNNEL_LOCK(drvdata) \
+do { \
+ /* wait for things to settle */ \
+ mb(); \
+ funnel_writel(drvdata, 0x0, CORESIGHT_LAR); \
+} while (0)
+#define FUNNEL_UNLOCK(drvdata) \
+do { \
+ funnel_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \
+ /* make sure everyone has seen this */ \
+ mb(); \
+} while (0)
+
+#define FUNNEL_FUNCTL (0x000)
+#define FUNNEL_PRICTL (0x004)
+
+#define FUNNEL_HOLDTIME_MASK (0xF00)
+#define FUNNEL_HOLDTIME_SHFT (0x8)
+#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
+
+struct funnel_drvdata {
+ void __iomem *base;
+ struct device *dev;
+ struct coresight_device *csdev;
+ struct clk *clk;
+ uint32_t priority;
+};
+
+static void __funnel_enable(struct funnel_drvdata *drvdata, int port)
+{
+ uint32_t functl;
+
+ FUNNEL_UNLOCK(drvdata);
+
+ functl = funnel_readl(drvdata, FUNNEL_FUNCTL);
+ functl &= ~FUNNEL_HOLDTIME_MASK;
+ functl |= FUNNEL_HOLDTIME;
+ functl |= (1 << port);
+ funnel_writel(drvdata, functl, FUNNEL_FUNCTL);
+ funnel_writel(drvdata, drvdata->priority, FUNNEL_PRICTL);
+
+ FUNNEL_LOCK(drvdata);
+}
+
+static int funnel_enable(struct coresight_device *csdev, int inport,
+ int outport)
+{
+ struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+ int ret;
+
+ ret = clk_prepare_enable(drvdata->clk);
+ if (ret)
+ return ret;
+
+ __funnel_enable(drvdata, inport);
+
+ dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
+ return 0;
+}
+
+static void __funnel_disable(struct funnel_drvdata *drvdata, int inport)
+{
+ uint32_t functl;
+
+ FUNNEL_UNLOCK(drvdata);
+
+ functl = funnel_readl(drvdata, FUNNEL_FUNCTL);
+ functl &= ~(1 << inport);
+ funnel_writel(drvdata, functl, FUNNEL_FUNCTL);
+
+ FUNNEL_LOCK(drvdata);
+}
+
+static void funnel_disable(struct coresight_device *csdev, int inport,
+ int outport)
+{
+ struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+
+ __funnel_disable(drvdata, inport);
+
+ clk_disable_unprepare(drvdata->clk);
+
+ dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
+}
+
+static const struct coresight_ops_link funnel_link_ops = {
+ .enable = funnel_enable,
+ .disable = funnel_disable,
+};
+
+static const struct coresight_ops funnel_cs_ops = {
+ .link_ops = &funnel_link_ops,
+};
+
+static ssize_t debugfs_show_funnel_priority(struct file *file,
+ char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ int ret;
+ unsigned long val;
+ char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ struct funnel_drvdata *drvdata = file->private_data;
+
+ val = drvdata->priority;
+ ret = scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+ ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+
+ kfree(buf);
+ return ret;
+}
+
+static ssize_t debugfs_store_funnel_priority(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ unsigned long val;
+ struct funnel_drvdata *drvdata = file->private_data;
+
+ if (sscanf(user_buf, "%lx", &val) != 1)
+ return -EINVAL;
+
+ drvdata->priority = val;
+ return count;
+}
+
+static const struct file_operations debugfs_funnel_priority_ops = {
+ .open = simple_open,
+ .read = debugfs_show_funnel_priority,
+ .write = debugfs_store_funnel_priority,
+};
+
+static const struct coresight_ops_entry debugfs_funnel_priority_entry = {
+ .name = "priority",
+ .mode = S_IRUGO | S_IWUSR,
+ .ops = &debugfs_funnel_priority_ops,
+};
+
+static uint32_t __get_funnel_ctrl(struct funnel_drvdata *drvdata)
+{
+ uint32_t functl;
+
+ FUNNEL_UNLOCK(drvdata);
+ functl = funnel_readl(drvdata, FUNNEL_FUNCTL);
+ FUNNEL_LOCK(drvdata);
+
+ return functl;
+}
+
+static ssize_t debugfs_show_funnel_ctrl(struct file *file,
+ char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ int ret;
+ unsigned long val;
+ struct funnel_drvdata *drvdata = file->private_data;
+ char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+
+ ret = clk_prepare_enable(drvdata->clk);
+ if (ret)
+ goto out;
+
+ val = __get_funnel_ctrl(drvdata);
+
+ clk_disable_unprepare(drvdata->clk);
+
+ ret = scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
+ ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
+
+out:
+ kfree(buf);
+ return ret;
+}
+
+static const struct file_operations debugfs_funnel_ctrl_ops = {
+ .open = simple_open,
+ .read = debugfs_show_funnel_ctrl,
+};
+
+static const struct coresight_ops_entry debugfs_funnel_ctrl_entry = {
+ .name = "funnel_ctrl",
+ .mode = S_IRUGO,
+ .ops = &debugfs_funnel_ctrl_ops,
+};
+
+static const struct coresight_ops_entry *funnel_attr_grps[] = {
+ &debugfs_funnel_priority_entry,
+ &debugfs_funnel_ctrl_entry,
+ NULL,
+};
+
+static int funnel_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct coresight_platform_data *pdata = NULL;
+ struct funnel_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;
+
+ desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+ desc->type = CORESIGHT_DEV_TYPE_LINK;
+ desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
+ desc->ops = &funnel_cs_ops;
+ desc->pdata = pdev->dev.platform_data;
+ desc->dev = &pdev->dev;
+ desc->debugfs_ops = funnel_attr_grps;
+ desc->owner = THIS_MODULE;
+ drvdata->csdev = coresight_register(desc);
+ if (IS_ERR(drvdata->csdev))
+ return PTR_ERR(drvdata->csdev);
+
+ dev_info(dev, "FUNNEL initialized\n");
+ return 0;
+}
+
+static int funnel_remove(struct platform_device *pdev)
+{
+ struct funnel_drvdata *drvdata = platform_get_drvdata(pdev);
+
+ coresight_unregister(drvdata->csdev);
+ return 0;
+}
+
+static struct of_device_id funnel_match[] = {
+ {.compatible = "arm,coresight-funnel"},
+ {}
+};
+
+static struct platform_driver funnel_driver = {
+ .probe = funnel_probe,
+ .remove = funnel_remove,
+ .driver = {
+ .name = "coresight-funnel",
+ .owner = THIS_MODULE,
+ .of_match_table = funnel_match,
+ },
+};
+
+static int __init funnel_init(void)
+{
+ return platform_driver_register(&funnel_driver);
+}
+module_init(funnel_init);
+
+static void __exit funnel_exit(void)
+{
+ platform_driver_unregister(&funnel_driver);
+}
+module_exit(funnel_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("CoreSight Funnel driver");
--
1.9.1
More information about the linux-arm-kernel
mailing list