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