447 lines
11 KiB
C
447 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
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*
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* Description: CoreSight Replicator driver
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*/
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#include <linux/acpi.h>
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#include <linux/amba/bus.h>
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#include <linux/kernel.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/pm_runtime.h>
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#include <linux/property.h>
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/coresight.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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DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
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/**
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* struct replicator_drvdata - specifics associated to a replicator component
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* @base: memory mapped base address for this component. Also indicates
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* whether this one is programmable or not.
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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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* @spinlock: serialize enable/disable operations.
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* @check_idfilter_val: check if the context is lost upon clock removal.
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*/
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struct replicator_drvdata {
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void __iomem *base;
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struct clk *atclk;
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struct coresight_device *csdev;
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spinlock_t spinlock;
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bool check_idfilter_val;
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};
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static void dynamic_replicator_reset(struct replicator_drvdata *drvdata)
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{
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struct coresight_device *csdev = drvdata->csdev;
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CS_UNLOCK(drvdata->base);
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if (!coresight_claim_device_unlocked(csdev)) {
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writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0);
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writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1);
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coresight_disclaim_device_unlocked(csdev);
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}
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CS_LOCK(drvdata->base);
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}
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/*
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* replicator_reset : Reset the replicator configuration to sane values.
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*/
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static inline void replicator_reset(struct replicator_drvdata *drvdata)
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{
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if (drvdata->base)
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dynamic_replicator_reset(drvdata);
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}
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static int dynamic_replicator_enable(struct replicator_drvdata *drvdata,
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int inport, int outport)
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{
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int rc = 0;
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u32 id0val, id1val;
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struct coresight_device *csdev = drvdata->csdev;
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CS_UNLOCK(drvdata->base);
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id0val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0);
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id1val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1);
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/*
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* Some replicator designs lose context when AMBA clocks are removed,
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* so have a check for this.
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*/
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if (drvdata->check_idfilter_val && id0val == 0x0 && id1val == 0x0)
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id0val = id1val = 0xff;
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if (id0val == 0xff && id1val == 0xff)
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rc = coresight_claim_device_unlocked(csdev);
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if (!rc) {
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switch (outport) {
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case 0:
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id0val = 0x0;
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break;
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case 1:
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id1val = 0x0;
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break;
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default:
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WARN_ON(1);
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rc = -EINVAL;
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}
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}
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/* Ensure that the outport is enabled. */
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if (!rc) {
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writel_relaxed(id0val, drvdata->base + REPLICATOR_IDFILTER0);
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writel_relaxed(id1val, drvdata->base + REPLICATOR_IDFILTER1);
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}
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CS_LOCK(drvdata->base);
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return rc;
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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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int rc = 0;
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struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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unsigned long flags;
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bool first_enable = false;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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if (atomic_read(&csdev->refcnt[outport]) == 0) {
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if (drvdata->base)
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rc = dynamic_replicator_enable(drvdata, inport,
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outport);
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if (!rc)
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first_enable = true;
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}
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if (!rc)
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atomic_inc(&csdev->refcnt[outport]);
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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if (first_enable)
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dev_dbg(&csdev->dev, "REPLICATOR enabled\n");
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return rc;
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}
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static void dynamic_replicator_disable(struct replicator_drvdata *drvdata,
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int inport, int outport)
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{
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u32 reg;
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struct coresight_device *csdev = drvdata->csdev;
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switch (outport) {
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case 0:
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reg = REPLICATOR_IDFILTER0;
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break;
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case 1:
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reg = REPLICATOR_IDFILTER1;
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break;
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default:
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WARN_ON(1);
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return;
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}
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CS_UNLOCK(drvdata->base);
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/* disable the flow of ATB data through port */
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writel_relaxed(0xff, drvdata->base + reg);
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if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) &&
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(readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff))
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coresight_disclaim_device_unlocked(csdev);
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CS_LOCK(drvdata->base);
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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_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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unsigned long flags;
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bool last_disable = false;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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if (atomic_dec_return(&csdev->refcnt[outport]) == 0) {
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if (drvdata->base)
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dynamic_replicator_disable(drvdata, inport, outport);
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last_disable = true;
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}
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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if (last_disable)
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dev_dbg(&csdev->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 struct attribute *replicator_mgmt_attrs[] = {
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coresight_simple_reg32(idfilter0, REPLICATOR_IDFILTER0),
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coresight_simple_reg32(idfilter1, REPLICATOR_IDFILTER1),
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NULL,
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};
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static const struct attribute_group replicator_mgmt_group = {
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.attrs = replicator_mgmt_attrs,
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.name = "mgmt",
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};
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static const struct attribute_group *replicator_groups[] = {
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&replicator_mgmt_group,
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NULL,
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};
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static int replicator_probe(struct device *dev, struct resource *res)
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{
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int ret = 0;
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struct coresight_platform_data *pdata = NULL;
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struct replicator_drvdata *drvdata;
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struct coresight_desc desc = { 0 };
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void __iomem *base;
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if (is_of_node(dev_fwnode(dev)) &&
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of_device_is_compatible(dev->of_node, "arm,coresight-replicator"))
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dev_warn_once(dev,
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"Uses OBSOLETE CoreSight replicator binding\n");
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desc.name = coresight_alloc_device_name(&replicator_devs, dev);
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if (!desc.name)
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return -ENOMEM;
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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->atclk = devm_clk_get(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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/*
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* Map the device base for dynamic-replicator, which has been
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* validated by AMBA core
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*/
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if (res) {
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base = devm_ioremap_resource(dev, res);
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if (IS_ERR(base)) {
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ret = PTR_ERR(base);
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goto out_disable_clk;
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}
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drvdata->base = base;
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desc.groups = replicator_groups;
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desc.access = CSDEV_ACCESS_IOMEM(base);
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}
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if (fwnode_property_present(dev_fwnode(dev),
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"qcom,replicator-loses-context"))
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drvdata->check_idfilter_val = true;
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dev_set_drvdata(dev, drvdata);
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pdata = coresight_get_platform_data(dev);
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if (IS_ERR(pdata)) {
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ret = PTR_ERR(pdata);
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goto out_disable_clk;
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}
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dev->platform_data = pdata;
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spin_lock_init(&drvdata->spinlock);
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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 = dev->platform_data;
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desc.dev = dev;
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drvdata->csdev = coresight_register(&desc);
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if (IS_ERR(drvdata->csdev)) {
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ret = PTR_ERR(drvdata->csdev);
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goto out_disable_clk;
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}
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replicator_reset(drvdata);
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pm_runtime_put(dev);
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out_disable_clk:
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if (ret && !IS_ERR_OR_NULL(drvdata->atclk))
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clk_disable_unprepare(drvdata->atclk);
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return ret;
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}
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static int replicator_remove(struct device *dev)
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{
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struct replicator_drvdata *drvdata = dev_get_drvdata(dev);
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coresight_unregister(drvdata->csdev);
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return 0;
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}
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static int static_replicator_probe(struct platform_device *pdev)
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{
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int ret;
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pm_runtime_get_noresume(&pdev->dev);
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_enable(&pdev->dev);
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/* Static replicators do not have programming base */
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ret = replicator_probe(&pdev->dev, NULL);
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if (ret) {
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pm_runtime_put_noidle(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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}
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return ret;
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}
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static int static_replicator_remove(struct platform_device *pdev)
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{
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replicator_remove(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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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_drvdata *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_drvdata *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, NULL)
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};
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static const struct of_device_id static_replicator_match[] = {
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{.compatible = "arm,coresight-replicator"},
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{.compatible = "arm,coresight-static-replicator"},
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{}
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};
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MODULE_DEVICE_TABLE(of, static_replicator_match);
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id static_replicator_acpi_ids[] = {
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{"ARMHC985", 0}, /* ARM CoreSight Static Replicator */
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{}
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};
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MODULE_DEVICE_TABLE(acpi, static_replicator_acpi_ids);
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#endif
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static struct platform_driver static_replicator_driver = {
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.probe = static_replicator_probe,
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.remove = static_replicator_remove,
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.driver = {
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.name = "coresight-static-replicator",
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/* THIS_MODULE is taken care of by platform_driver_register() */
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.of_match_table = of_match_ptr(static_replicator_match),
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.acpi_match_table = ACPI_PTR(static_replicator_acpi_ids),
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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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};
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static int dynamic_replicator_probe(struct amba_device *adev,
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const struct amba_id *id)
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{
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return replicator_probe(&adev->dev, &adev->res);
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}
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static void dynamic_replicator_remove(struct amba_device *adev)
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{
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replicator_remove(&adev->dev);
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}
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static const struct amba_id dynamic_replicator_ids[] = {
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CS_AMBA_ID(0x000bb909),
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CS_AMBA_ID(0x000bb9ec), /* Coresight SoC-600 */
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{},
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};
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MODULE_DEVICE_TABLE(amba, dynamic_replicator_ids);
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static struct amba_driver dynamic_replicator_driver = {
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.drv = {
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.name = "coresight-dynamic-replicator",
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.pm = &replicator_dev_pm_ops,
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.owner = THIS_MODULE,
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.suppress_bind_attrs = true,
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},
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.probe = dynamic_replicator_probe,
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.remove = dynamic_replicator_remove,
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.id_table = dynamic_replicator_ids,
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};
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static int __init replicator_init(void)
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{
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int ret;
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ret = platform_driver_register(&static_replicator_driver);
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if (ret) {
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pr_info("Error registering platform driver\n");
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return ret;
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}
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ret = amba_driver_register(&dynamic_replicator_driver);
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if (ret) {
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pr_info("Error registering amba driver\n");
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platform_driver_unregister(&static_replicator_driver);
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}
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return ret;
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}
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static void __exit replicator_exit(void)
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{
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platform_driver_unregister(&static_replicator_driver);
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amba_driver_unregister(&dynamic_replicator_driver);
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}
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module_init(replicator_init);
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module_exit(replicator_exit);
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MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
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MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>");
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MODULE_DESCRIPTION("Arm CoreSight Replicator Driver");
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MODULE_LICENSE("GPL v2");
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