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    Subject[RFC PATCH 05/11] coresight: add CoreSight Funnel driver
    Date
    From: Pratik Patel <pratikp@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@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-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


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