coresight-funnel: add CoreSight Funnel driver
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: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pratik Patel
Greg Kroah-Hartman
parent
fdfc0d8a06
commit
6e21e34515
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@ -6,3 +6,4 @@ obj-$(CONFIG_OF) += of_coresight.o
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obj-$(CONFIG_CORESIGHT_LINK_AND_SINK_TMC) += coresight-tmc.o
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obj-$(CONFIG_CORESIGHT_SINK_TPIU) += coresight-tpiu.o
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obj-$(CONFIG_CORESIGHT_SINK_ETBV10) += coresight-etb10.o
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obj-$(CONFIG_CORESIGHT_LINKS_AND_SINKS) += coresight-funnel.o
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@ -0,0 +1,268 @@
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/* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include <linux/coresight.h>
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#include <linux/amba/bus.h>
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#include "coresight-priv.h"
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#define FUNNEL_FUNCTL 0x000
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#define FUNNEL_PRICTL 0x004
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#define FUNNEL_HOLDTIME_MASK 0xf00
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#define FUNNEL_HOLDTIME_SHFT 0x8
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#define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT)
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/**
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* struct funnel_drvdata - specifics associated to a funnel component
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* @base: memory mapped base address for this component.
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* @dev: the device entity associated to this component.
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* @csdev: component vitals needed by the framework.
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* @clk: the clock this component is associated to.
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* @priority: port selection order.
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*/
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struct funnel_drvdata {
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void __iomem *base;
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struct device *dev;
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struct coresight_device *csdev;
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struct clk *clk;
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unsigned long priority;
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};
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static void funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
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{
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u32 functl;
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CS_UNLOCK(drvdata->base);
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functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
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functl &= ~FUNNEL_HOLDTIME_MASK;
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functl |= FUNNEL_HOLDTIME;
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functl |= (1 << port);
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writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
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writel_relaxed(drvdata->priority, drvdata->base + FUNNEL_PRICTL);
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CS_LOCK(drvdata->base);
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}
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static int funnel_enable(struct coresight_device *csdev, int inport,
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int outport)
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{
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struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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int ret;
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ret = clk_prepare_enable(drvdata->clk);
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if (ret)
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return ret;
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funnel_enable_hw(drvdata, inport);
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dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport);
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return 0;
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}
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static void funnel_disable_hw(struct funnel_drvdata *drvdata, int inport)
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{
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u32 functl;
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CS_UNLOCK(drvdata->base);
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functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
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functl &= ~(1 << inport);
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writel_relaxed(functl, drvdata->base + FUNNEL_FUNCTL);
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CS_LOCK(drvdata->base);
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}
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static void funnel_disable(struct coresight_device *csdev, int inport,
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int outport)
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{
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struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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funnel_disable_hw(drvdata, inport);
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clk_disable_unprepare(drvdata->clk);
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dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport);
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}
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static const struct coresight_ops_link funnel_link_ops = {
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.enable = funnel_enable,
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.disable = funnel_disable,
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};
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static const struct coresight_ops funnel_cs_ops = {
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.link_ops = &funnel_link_ops,
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};
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static ssize_t priority_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
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unsigned long val = drvdata->priority;
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return sprintf(buf, "%#lx\n", val);
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}
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static ssize_t priority_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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int ret;
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unsigned long val;
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struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
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ret = kstrtoul(buf, 16, &val);
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if (ret)
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return ret;
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drvdata->priority = val;
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return size;
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}
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static DEVICE_ATTR_RW(priority);
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static u32 get_funnel_ctrl_hw(struct funnel_drvdata *drvdata)
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{
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u32 functl;
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CS_UNLOCK(drvdata->base);
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functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
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CS_LOCK(drvdata->base);
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return functl;
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}
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static ssize_t funnel_ctrl_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int ret;
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u32 val;
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struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
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ret = clk_prepare_enable(drvdata->clk);
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if (ret)
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return ret;
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val = get_funnel_ctrl_hw(drvdata);
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clk_disable_unprepare(drvdata->clk);
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return sprintf(buf, "%#x\n", val);
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}
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static DEVICE_ATTR_RO(funnel_ctrl);
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static struct attribute *coresight_funnel_attrs[] = {
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&dev_attr_funnel_ctrl.attr,
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&dev_attr_priority.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(coresight_funnel);
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static int funnel_probe(struct amba_device *adev, const struct amba_id *id)
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{
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void __iomem *base;
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struct device *dev = &adev->dev;
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struct coresight_platform_data *pdata = NULL;
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struct funnel_drvdata *drvdata;
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struct resource *res = &adev->res;
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struct coresight_desc *desc;
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struct device_node *np = adev->dev.of_node;
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if (np) {
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pdata = of_get_coresight_platform_data(dev, np);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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adev->dev.platform_data = pdata;
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}
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drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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drvdata->dev = &adev->dev;
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dev_set_drvdata(dev, drvdata);
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/* Validity for the resource is already checked by the AMBA core */
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base = devm_ioremap_resource(dev, res);
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if (IS_ERR(base))
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return PTR_ERR(base);
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drvdata->base = base;
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drvdata->clk = adev->pclk;
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desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL);
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if (!desc)
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return -ENOMEM;
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desc->type = CORESIGHT_DEV_TYPE_LINK;
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desc->subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG;
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desc->ops = &funnel_cs_ops;
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desc->pdata = pdata;
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desc->dev = dev;
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desc->groups = coresight_funnel_groups;
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drvdata->csdev = coresight_register(desc);
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if (IS_ERR(drvdata->csdev))
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return PTR_ERR(drvdata->csdev);
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dev_info(dev, "FUNNEL initialized\n");
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return 0;
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}
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static int funnel_remove(struct amba_device *adev)
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{
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struct funnel_drvdata *drvdata = amba_get_drvdata(adev);
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coresight_unregister(drvdata->csdev);
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return 0;
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}
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static struct amba_id funnel_ids[] = {
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{
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.id = 0x0003b908,
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.mask = 0x0003ffff,
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},
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{ 0, 0},
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};
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static struct amba_driver funnel_driver = {
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.drv = {
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.name = "coresight-funnel",
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.owner = THIS_MODULE,
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},
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.probe = funnel_probe,
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.remove = funnel_remove,
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.id_table = funnel_ids,
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};
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static int __init funnel_init(void)
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{
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return amba_driver_register(&funnel_driver);
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}
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module_init(funnel_init);
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static void __exit funnel_exit(void)
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{
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amba_driver_unregister(&funnel_driver);
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}
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module_exit(funnel_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("CoreSight Funnel driver");
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