diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/hwtracing/coresight/coresight-replicator.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-replicator.c')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-replicator.c | 449 |
1 files changed, 449 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c new file mode 100644 index 0000000000..b6be730349 --- /dev/null +++ b/drivers/hwtracing/coresight/coresight-replicator.c @@ -0,0 +1,449 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved. + * + * Description: CoreSight Replicator driver + */ + +#include <linux/acpi.h> +#include <linux/amba/bus.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/pm_runtime.h> +#include <linux/property.h> +#include <linux/clk.h> +#include <linux/of.h> +#include <linux/coresight.h> + +#include "coresight-priv.h" + +#define REPLICATOR_IDFILTER0 0x000 +#define REPLICATOR_IDFILTER1 0x004 + +DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator"); + +/** + * struct replicator_drvdata - specifics associated to a replicator component + * @base: memory mapped base address for this component. Also indicates + * whether this one is programmable or not. + * @atclk: optional clock for the core parts of the replicator. + * @csdev: component vitals needed by the framework + * @spinlock: serialize enable/disable operations. + * @check_idfilter_val: check if the context is lost upon clock removal. + */ +struct replicator_drvdata { + void __iomem *base; + struct clk *atclk; + struct coresight_device *csdev; + spinlock_t spinlock; + bool check_idfilter_val; +}; + +static void dynamic_replicator_reset(struct replicator_drvdata *drvdata) +{ + struct coresight_device *csdev = drvdata->csdev; + + CS_UNLOCK(drvdata->base); + + if (!coresight_claim_device_unlocked(csdev)) { + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER0); + writel_relaxed(0xff, drvdata->base + REPLICATOR_IDFILTER1); + coresight_disclaim_device_unlocked(csdev); + } + + CS_LOCK(drvdata->base); +} + +/* + * replicator_reset : Reset the replicator configuration to sane values. + */ +static inline void replicator_reset(struct replicator_drvdata *drvdata) +{ + if (drvdata->base) + dynamic_replicator_reset(drvdata); +} + +static int dynamic_replicator_enable(struct replicator_drvdata *drvdata, + int inport, int outport) +{ + int rc = 0; + u32 id0val, id1val; + struct coresight_device *csdev = drvdata->csdev; + + CS_UNLOCK(drvdata->base); + + id0val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0); + id1val = readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1); + + /* + * Some replicator designs lose context when AMBA clocks are removed, + * so have a check for this. + */ + if (drvdata->check_idfilter_val && id0val == 0x0 && id1val == 0x0) + id0val = id1val = 0xff; + + if (id0val == 0xff && id1val == 0xff) + rc = coresight_claim_device_unlocked(csdev); + + if (!rc) { + switch (outport) { + case 0: + id0val = 0x0; + break; + case 1: + id1val = 0x0; + break; + default: + WARN_ON(1); + rc = -EINVAL; + } + } + + /* Ensure that the outport is enabled. */ + if (!rc) { + writel_relaxed(id0val, drvdata->base + REPLICATOR_IDFILTER0); + writel_relaxed(id1val, drvdata->base + REPLICATOR_IDFILTER1); + } + + CS_LOCK(drvdata->base); + + return rc; +} + +static int replicator_enable(struct coresight_device *csdev, + struct coresight_connection *in, + struct coresight_connection *out) +{ + int rc = 0; + struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + unsigned long flags; + bool first_enable = false; + + spin_lock_irqsave(&drvdata->spinlock, flags); + if (atomic_read(&out->src_refcnt) == 0) { + if (drvdata->base) + rc = dynamic_replicator_enable(drvdata, in->dest_port, + out->src_port); + if (!rc) + first_enable = true; + } + if (!rc) + atomic_inc(&out->src_refcnt); + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + if (first_enable) + dev_dbg(&csdev->dev, "REPLICATOR enabled\n"); + return rc; +} + +static void dynamic_replicator_disable(struct replicator_drvdata *drvdata, + int inport, int outport) +{ + u32 reg; + struct coresight_device *csdev = drvdata->csdev; + + switch (outport) { + case 0: + reg = REPLICATOR_IDFILTER0; + break; + case 1: + reg = REPLICATOR_IDFILTER1; + break; + default: + WARN_ON(1); + return; + } + + CS_UNLOCK(drvdata->base); + + /* disable the flow of ATB data through port */ + writel_relaxed(0xff, drvdata->base + reg); + + if ((readl_relaxed(drvdata->base + REPLICATOR_IDFILTER0) == 0xff) && + (readl_relaxed(drvdata->base + REPLICATOR_IDFILTER1) == 0xff)) + coresight_disclaim_device_unlocked(csdev); + CS_LOCK(drvdata->base); +} + +static void replicator_disable(struct coresight_device *csdev, + struct coresight_connection *in, + struct coresight_connection *out) +{ + struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + unsigned long flags; + bool last_disable = false; + + spin_lock_irqsave(&drvdata->spinlock, flags); + if (atomic_dec_return(&out->src_refcnt) == 0) { + if (drvdata->base) + dynamic_replicator_disable(drvdata, in->dest_port, + out->src_port); + last_disable = true; + } + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + if (last_disable) + dev_dbg(&csdev->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 struct attribute *replicator_mgmt_attrs[] = { + coresight_simple_reg32(idfilter0, REPLICATOR_IDFILTER0), + coresight_simple_reg32(idfilter1, REPLICATOR_IDFILTER1), + NULL, +}; + +static const struct attribute_group replicator_mgmt_group = { + .attrs = replicator_mgmt_attrs, + .name = "mgmt", +}; + +static const struct attribute_group *replicator_groups[] = { + &replicator_mgmt_group, + NULL, +}; + +static int replicator_probe(struct device *dev, struct resource *res) +{ + int ret = 0; + struct coresight_platform_data *pdata = NULL; + struct replicator_drvdata *drvdata; + struct coresight_desc desc = { 0 }; + void __iomem *base; + + if (is_of_node(dev_fwnode(dev)) && + of_device_is_compatible(dev->of_node, "arm,coresight-replicator")) + dev_warn_once(dev, + "Uses OBSOLETE CoreSight replicator binding\n"); + + desc.name = coresight_alloc_device_name(&replicator_devs, dev); + if (!desc.name) + return -ENOMEM; + + drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */ + if (!IS_ERR(drvdata->atclk)) { + ret = clk_prepare_enable(drvdata->atclk); + if (ret) + return ret; + } + + /* + * Map the device base for dynamic-replicator, which has been + * validated by AMBA core + */ + if (res) { + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) { + ret = PTR_ERR(base); + goto out_disable_clk; + } + drvdata->base = base; + desc.groups = replicator_groups; + desc.access = CSDEV_ACCESS_IOMEM(base); + } + + if (fwnode_property_present(dev_fwnode(dev), + "qcom,replicator-loses-context")) + drvdata->check_idfilter_val = true; + + dev_set_drvdata(dev, drvdata); + + pdata = coresight_get_platform_data(dev); + if (IS_ERR(pdata)) { + ret = PTR_ERR(pdata); + goto out_disable_clk; + } + dev->platform_data = pdata; + + spin_lock_init(&drvdata->spinlock); + desc.type = CORESIGHT_DEV_TYPE_LINK; + desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT; + desc.ops = &replicator_cs_ops; + desc.pdata = dev->platform_data; + desc.dev = dev; + + drvdata->csdev = coresight_register(&desc); + if (IS_ERR(drvdata->csdev)) { + ret = PTR_ERR(drvdata->csdev); + goto out_disable_clk; + } + + replicator_reset(drvdata); + pm_runtime_put(dev); + +out_disable_clk: + if (ret && !IS_ERR_OR_NULL(drvdata->atclk)) + clk_disable_unprepare(drvdata->atclk); + return ret; +} + +static int replicator_remove(struct device *dev) +{ + struct replicator_drvdata *drvdata = dev_get_drvdata(dev); + + coresight_unregister(drvdata->csdev); + return 0; +} + +static int static_replicator_probe(struct platform_device *pdev) +{ + int ret; + + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + /* Static replicators do not have programming base */ + ret = replicator_probe(&pdev->dev, NULL); + + if (ret) { + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + } + + return ret; +} + +static int static_replicator_remove(struct platform_device *pdev) +{ + replicator_remove(&pdev->dev); + pm_runtime_disable(&pdev->dev); + return 0; +} + +#ifdef CONFIG_PM +static int replicator_runtime_suspend(struct device *dev) +{ + struct replicator_drvdata *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_drvdata *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 const struct of_device_id static_replicator_match[] = { + {.compatible = "arm,coresight-replicator"}, + {.compatible = "arm,coresight-static-replicator"}, + {} +}; + +MODULE_DEVICE_TABLE(of, static_replicator_match); + +#ifdef CONFIG_ACPI +static const struct acpi_device_id static_replicator_acpi_ids[] = { + {"ARMHC985", 0}, /* ARM CoreSight Static Replicator */ + {} +}; + +MODULE_DEVICE_TABLE(acpi, static_replicator_acpi_ids); +#endif + +static struct platform_driver static_replicator_driver = { + .probe = static_replicator_probe, + .remove = static_replicator_remove, + .driver = { + .name = "coresight-static-replicator", + /* THIS_MODULE is taken care of by platform_driver_register() */ + .of_match_table = of_match_ptr(static_replicator_match), + .acpi_match_table = ACPI_PTR(static_replicator_acpi_ids), + .pm = &replicator_dev_pm_ops, + .suppress_bind_attrs = true, + }, +}; + +static int dynamic_replicator_probe(struct amba_device *adev, + const struct amba_id *id) +{ + return replicator_probe(&adev->dev, &adev->res); +} + +static void dynamic_replicator_remove(struct amba_device *adev) +{ + replicator_remove(&adev->dev); +} + +static const struct amba_id dynamic_replicator_ids[] = { + CS_AMBA_ID(0x000bb909), + CS_AMBA_ID(0x000bb9ec), /* Coresight SoC-600 */ + {}, +}; + +MODULE_DEVICE_TABLE(amba, dynamic_replicator_ids); + +static struct amba_driver dynamic_replicator_driver = { + .drv = { + .name = "coresight-dynamic-replicator", + .pm = &replicator_dev_pm_ops, + .owner = THIS_MODULE, + .suppress_bind_attrs = true, + }, + .probe = dynamic_replicator_probe, + .remove = dynamic_replicator_remove, + .id_table = dynamic_replicator_ids, +}; + +static int __init replicator_init(void) +{ + int ret; + + ret = platform_driver_register(&static_replicator_driver); + if (ret) { + pr_info("Error registering platform driver\n"); + return ret; + } + + ret = amba_driver_register(&dynamic_replicator_driver); + if (ret) { + pr_info("Error registering amba driver\n"); + platform_driver_unregister(&static_replicator_driver); + } + + return ret; +} + +static void __exit replicator_exit(void) +{ + platform_driver_unregister(&static_replicator_driver); + amba_driver_unregister(&dynamic_replicator_driver); +} + +module_init(replicator_init); +module_exit(replicator_exit); + +MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>"); +MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>"); +MODULE_DESCRIPTION("Arm CoreSight Replicator Driver"); +MODULE_LICENSE("GPL v2"); |