201 lines
5.2 KiB
C
201 lines
5.2 KiB
C
/*
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* Copyright (c) 2011-2015, 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/amba/bus.h>
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#include <linux/clk.h>
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#include <linux/coresight.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/pm_runtime.h>
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#include <linux/slab.h>
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#include "coresight-priv.h"
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#define REPLICATOR_IDFILTER0 0x000
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#define REPLICATOR_IDFILTER1 0x004
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/**
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* struct replicator_state - specifics associated to a replicator component
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* @base: memory mapped base address for this component.
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* @dev: the device entity associated with this component
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* @atclk: optional clock for the core parts of the replicator.
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* @csdev: component vitals needed by the framework
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*/
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struct replicator_state {
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void __iomem *base;
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struct device *dev;
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struct clk *atclk;
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struct coresight_device *csdev;
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};
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static int replicator_enable(struct coresight_device *csdev, int inport,
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int outport)
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{
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struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
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CS_UNLOCK(drvdata->base);
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/*
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* Ensure that the other port is disabled
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* 0x00 - passing through the replicator unimpeded
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* 0xff - disable (or impede) the flow of ATB data
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*/
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if (outport == 0) {
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writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER0);
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writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
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} else {
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writel_relaxed(0x00, drvdata->base + REPLICATOR_IDFILTER1);
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writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
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}
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CS_LOCK(drvdata->base);
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dev_info(drvdata->dev, "REPLICATOR enabled\n");
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return 0;
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}
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static void replicator_disable(struct coresight_device *csdev, int inport,
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int outport)
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{
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struct replicator_state *drvdata = dev_get_drvdata(csdev->dev.parent);
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CS_UNLOCK(drvdata->base);
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/* disable the flow of ATB data through port */
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if (outport == 0)
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writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
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else
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writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
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CS_LOCK(drvdata->base);
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dev_info(drvdata->dev, "REPLICATOR disabled\n");
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}
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static const struct coresight_ops_link replicator_link_ops = {
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.enable = replicator_enable,
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.disable = replicator_disable,
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};
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static const struct coresight_ops replicator_cs_ops = {
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.link_ops = &replicator_link_ops,
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};
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static int replicator_probe(struct amba_device *adev, const struct amba_id *id)
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{
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int ret;
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struct device *dev = &adev->dev;
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struct resource *res = &adev->res;
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struct coresight_platform_data *pdata = NULL;
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struct replicator_state *drvdata;
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struct coresight_desc *desc;
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struct device_node *np = adev->dev.of_node;
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void __iomem *base;
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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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drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
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if (!IS_ERR(drvdata->atclk)) {
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ret = clk_prepare_enable(drvdata->atclk);
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if (ret)
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return ret;
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}
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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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dev_set_drvdata(dev, drvdata);
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pm_runtime_put(&adev->dev);
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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_SPLIT;
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desc->ops = &replicator_cs_ops;
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desc->pdata = adev->dev.platform_data;
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desc->dev = &adev->dev;
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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, "%s initialized\n", (char *)id->data);
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return 0;
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}
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#ifdef CONFIG_PM
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static int replicator_runtime_suspend(struct device *dev)
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{
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struct replicator_state *drvdata = dev_get_drvdata(dev);
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if (drvdata && !IS_ERR(drvdata->atclk))
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clk_disable_unprepare(drvdata->atclk);
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return 0;
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}
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static int replicator_runtime_resume(struct device *dev)
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{
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struct replicator_state *drvdata = dev_get_drvdata(dev);
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if (drvdata && !IS_ERR(drvdata->atclk))
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clk_prepare_enable(drvdata->atclk);
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return 0;
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}
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#endif
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static const struct dev_pm_ops replicator_dev_pm_ops = {
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SET_RUNTIME_PM_OPS(replicator_runtime_suspend,
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replicator_runtime_resume,
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NULL)
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};
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static struct amba_id replicator_ids[] = {
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{
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.id = 0x0003b909,
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.mask = 0x0003ffff,
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.data = "REPLICATOR 1.0",
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},
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{ 0, 0 },
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};
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static struct amba_driver replicator_driver = {
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.drv = {
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.name = "coresight-replicator-qcom",
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.pm = &replicator_dev_pm_ops,
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.suppress_bind_attrs = true,
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},
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.probe = replicator_probe,
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.id_table = replicator_ids,
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};
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builtin_amba_driver(replicator_driver);
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