261 lines
6.4 KiB
C
261 lines
6.4 KiB
C
/* Copyright (c) 2011-2013, 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/platform_device.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/clk.h>
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#include <linux/of_coresight.h>
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#include <linux/coresight.h>
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#include "coresight-priv.h"
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#define funnel_writel(drvdata, val, off) \
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__raw_writel((val), drvdata->base + off)
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#define funnel_readl(drvdata, off) \
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__raw_readl(drvdata->base + off)
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#define FUNNEL_LOCK(drvdata) \
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do { \
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mb(); \
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funnel_writel(drvdata, 0x0, CORESIGHT_LAR); \
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} while (0)
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#define FUNNEL_UNLOCK(drvdata) \
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do { \
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funnel_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \
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mb(); \
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} while (0)
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#define FUNNEL_FUNCTL (0x000)
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#define FUNNEL_PRICTL (0x004)
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#define FUNNEL_ITATBDATA0 (0xEEC)
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#define FUNNEL_ITATBCTR2 (0xEF0)
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#define FUNNEL_ITATBCTR1 (0xEF4)
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#define FUNNEL_ITATBCTR0 (0xEF8)
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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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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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uint32_t priority;
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};
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static void __funnel_enable(struct funnel_drvdata *drvdata, int port)
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{
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uint32_t functl;
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FUNNEL_UNLOCK(drvdata);
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functl = funnel_readl(drvdata, 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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funnel_writel(drvdata, functl, FUNNEL_FUNCTL);
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funnel_writel(drvdata, drvdata->priority, FUNNEL_PRICTL);
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FUNNEL_LOCK(drvdata);
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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(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(struct funnel_drvdata *drvdata, int inport)
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{
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uint32_t functl;
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FUNNEL_UNLOCK(drvdata);
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functl = funnel_readl(drvdata, FUNNEL_FUNCTL);
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functl &= ~(1 << inport);
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funnel_writel(drvdata, functl, FUNNEL_FUNCTL);
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FUNNEL_LOCK(drvdata);
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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(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 funnel_show_priority(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 scnprintf(buf, PAGE_SIZE, "%#lx\n", val);
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}
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static ssize_t funnel_store_priority(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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struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
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unsigned long val;
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if (sscanf(buf, "%lx", &val) != 1)
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return -EINVAL;
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drvdata->priority = val;
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return size;
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}
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static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, funnel_show_priority,
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funnel_store_priority);
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static struct attribute *funnel_attrs[] = {
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&dev_attr_priority.attr,
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NULL,
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};
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static struct attribute_group funnel_attr_grp = {
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.attrs = funnel_attrs,
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};
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static const struct attribute_group *funnel_attr_grps[] = {
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&funnel_attr_grp,
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NULL,
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};
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static int __devinit funnel_probe(struct platform_device *pdev)
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{
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int ret;
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struct device *dev = &pdev->dev;
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struct coresight_platform_data *pdata;
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struct funnel_drvdata *drvdata;
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struct resource *res;
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struct coresight_desc *desc;
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if (pdev->dev.of_node) {
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pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node);
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if (IS_ERR(pdata))
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return PTR_ERR(pdata);
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pdev->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 = &pdev->dev;
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platform_set_drvdata(pdev, drvdata);
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "funnel-base");
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if (!res)
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return -ENODEV;
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drvdata->base = devm_ioremap(dev, res->start, resource_size(res));
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if (!drvdata->base)
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return -ENOMEM;
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drvdata->clk = devm_clk_get(dev, "core_clk");
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if (IS_ERR(drvdata->clk))
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return PTR_ERR(drvdata->clk);
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ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE);
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if (ret)
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return ret;
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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 = pdev->dev.platform_data;
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desc->dev = &pdev->dev;
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desc->groups = funnel_attr_grps;
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desc->owner = THIS_MODULE;
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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 __devexit funnel_remove(struct platform_device *pdev)
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{
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struct funnel_drvdata *drvdata = platform_get_drvdata(pdev);
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coresight_unregister(drvdata->csdev);
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return 0;
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}
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static struct of_device_id funnel_match[] = {
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{.compatible = "arm,coresight-funnel"},
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{}
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};
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static struct platform_driver funnel_driver = {
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.probe = funnel_probe,
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.remove = __devexit_p(funnel_remove),
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.driver = {
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.name = "coresight-funnel",
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.owner = THIS_MODULE,
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.of_match_table = funnel_match,
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},
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};
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static int __init funnel_init(void)
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{
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return platform_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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platform_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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