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synced 2024-08-21 08:19:28 +00:00
![Greg Kroah-Hartman](/assets/img/avatar_default.png)
This merges from linux-arm at 860660fd82
("ARM: 9055/1: mailbox:
arm_mhuv2: make remove callback return void") into char-misc-next to get
the amba fixes from Uwe.
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
439 lines
10 KiB
C
439 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
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*
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* Description: CoreSight Funnel driver
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*/
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#include <linux/acpi.h>
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#include <linux/kernel.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/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/coresight.h>
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#include <linux/amba/bus.h>
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#include <linux/clk.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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#define FUNNEL_ENSx_MASK 0xff
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DEFINE_CORESIGHT_DEVLIST(funnel_devs, "funnel");
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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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* @atclk: optional clock for the core parts of the funnel.
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* @csdev: component vitals needed by the framework.
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* @priority: port selection order.
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* @spinlock: serialize enable/disable operations.
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*/
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struct funnel_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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unsigned long priority;
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spinlock_t spinlock;
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};
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static int dynamic_funnel_enable_hw(struct funnel_drvdata *drvdata, int port)
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{
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u32 functl;
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int rc = 0;
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struct coresight_device *csdev = drvdata->csdev;
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CS_UNLOCK(drvdata->base);
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functl = readl_relaxed(drvdata->base + FUNNEL_FUNCTL);
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/* Claim the device only when we enable the first slave */
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if (!(functl & FUNNEL_ENSx_MASK)) {
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rc = coresight_claim_device_unlocked(csdev);
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if (rc)
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goto done;
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}
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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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done:
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CS_LOCK(drvdata->base);
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return rc;
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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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int rc = 0;
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struct funnel_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[inport]) == 0) {
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if (drvdata->base)
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rc = dynamic_funnel_enable_hw(drvdata, inport);
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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[inport]);
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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, "FUNNEL inport %d enabled\n", inport);
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return rc;
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}
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static void dynamic_funnel_disable_hw(struct funnel_drvdata *drvdata,
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int inport)
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{
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u32 functl;
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struct coresight_device *csdev = drvdata->csdev;
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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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/* Disclaim the device if none of the slaves are now active */
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if (!(functl & FUNNEL_ENSx_MASK))
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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 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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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[inport]) == 0) {
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if (drvdata->base)
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dynamic_funnel_disable_hw(drvdata, inport);
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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, "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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u32 val;
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struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent);
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pm_runtime_get_sync(dev->parent);
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val = get_funnel_ctrl_hw(drvdata);
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pm_runtime_put(dev->parent);
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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 device *dev, struct resource *res)
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{
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int ret;
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void __iomem *base;
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struct coresight_platform_data *pdata = NULL;
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struct funnel_drvdata *drvdata;
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struct coresight_desc desc = { 0 };
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if (is_of_node(dev_fwnode(dev)) &&
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of_device_is_compatible(dev->of_node, "arm,coresight-funnel"))
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dev_warn_once(dev, "Uses OBSOLETE CoreSight funnel binding\n");
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desc.name = coresight_alloc_device_name(&funnel_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-funnel, 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 = coresight_funnel_groups;
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desc.access = CSDEV_ACCESS_IOMEM(base);
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}
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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_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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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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pm_runtime_put(dev);
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ret = 0;
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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 funnel_remove(struct device *dev)
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{
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struct funnel_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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#ifdef CONFIG_PM
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static int funnel_runtime_suspend(struct device *dev)
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{
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struct funnel_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 funnel_runtime_resume(struct device *dev)
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{
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struct funnel_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 funnel_dev_pm_ops = {
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SET_RUNTIME_PM_OPS(funnel_runtime_suspend, funnel_runtime_resume, NULL)
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};
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static int static_funnel_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 funnel do not have programming base */
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ret = funnel_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_funnel_remove(struct platform_device *pdev)
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{
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funnel_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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static const struct of_device_id static_funnel_match[] = {
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{.compatible = "arm,coresight-static-funnel"},
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{}
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};
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MODULE_DEVICE_TABLE(of, static_funnel_match);
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#ifdef CONFIG_ACPI
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static const struct acpi_device_id static_funnel_ids[] = {
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{"ARMHC9FE", 0},
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{},
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};
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MODULE_DEVICE_TABLE(acpi, static_funnel_ids);
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#endif
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static struct platform_driver static_funnel_driver = {
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.probe = static_funnel_probe,
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.remove = static_funnel_remove,
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.driver = {
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.name = "coresight-static-funnel",
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/* THIS_MODULE is taken care of by platform_driver_register() */
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.of_match_table = static_funnel_match,
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.acpi_match_table = ACPI_PTR(static_funnel_ids),
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.pm = &funnel_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_funnel_probe(struct amba_device *adev,
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const struct amba_id *id)
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{
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return funnel_probe(&adev->dev, &adev->res);
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}
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static void dynamic_funnel_remove(struct amba_device *adev)
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{
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funnel_remove(&adev->dev);
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}
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static const struct amba_id dynamic_funnel_ids[] = {
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{
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.id = 0x000bb908,
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.mask = 0x000fffff,
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},
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{
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/* Coresight SoC-600 */
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.id = 0x000bb9eb,
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.mask = 0x000fffff,
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},
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{ 0, 0},
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};
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MODULE_DEVICE_TABLE(amba, dynamic_funnel_ids);
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static struct amba_driver dynamic_funnel_driver = {
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.drv = {
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.name = "coresight-dynamic-funnel",
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.owner = THIS_MODULE,
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.pm = &funnel_dev_pm_ops,
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.suppress_bind_attrs = true,
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},
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.probe = dynamic_funnel_probe,
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.remove = dynamic_funnel_remove,
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.id_table = dynamic_funnel_ids,
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};
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static int __init funnel_init(void)
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{
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int ret;
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ret = platform_driver_register(&static_funnel_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_funnel_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_funnel_driver);
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}
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return ret;
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}
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static void __exit funnel_exit(void)
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{
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platform_driver_unregister(&static_funnel_driver);
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amba_driver_unregister(&dynamic_funnel_driver);
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}
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module_init(funnel_init);
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module_exit(funnel_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 Funnel Driver");
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MODULE_LICENSE("GPL v2");
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