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Message-Id: <20230904080856.2183421-2-anshuman.khandual@arm.com>
Date: Mon, 4 Sep 2023 13:38:50 +0530
From: Anshuman Khandual <anshuman.khandual@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: Anshuman Khandual <anshuman.khandual@....com>,
Suzuki Poulose <suzuki.poulose@....com>,
James Clark <james.clark@....com>,
Mike Leach <mike.leach@...aro.org>, coresight@...ts.linaro.org,
linux-kernel@...r.kernel.org
Subject: [RFC 1/7] coresight: replicator: Move ACPI support from AMBA driver to platform driver
Add support for the dynamic replicator device in the platform driver, which
can then be used on ACPI based platforms. This change would now allow
runtime power management for repliacator devices on ACPI based systems.
The driver would try to enable the APB clock if available. Also, rename the
code to reflect the fact that it now handles both static and dynamic
replicators.
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
drivers/acpi/acpi_amba.c | 1 -
.../coresight/coresight-replicator.c | 44 ++++++++++++-------
2 files changed, 27 insertions(+), 18 deletions(-)
diff --git a/drivers/acpi/acpi_amba.c b/drivers/acpi/acpi_amba.c
index 099966cbac5a..fee7e35fa99e 100644
--- a/drivers/acpi/acpi_amba.c
+++ b/drivers/acpi/acpi_amba.c
@@ -27,7 +27,6 @@ static const struct acpi_device_id amba_id_list[] = {
{"ARMHC503", 0}, /* ARM CoreSight Debug */
{"ARMHC979", 0}, /* ARM CoreSight TPIU */
{"ARMHC97C", 0}, /* ARM CoreSight SoC-400 TMC, SoC-600 ETF/ETB */
- {"ARMHC98D", 0}, /* ARM CoreSight Dynamic Replicator */
{"ARMHC9CA", 0}, /* ARM CoreSight CATU */
{"ARMHC9FF", 0}, /* ARM CoreSight Dynamic Funnel */
{"", 0},
diff --git a/drivers/hwtracing/coresight/coresight-replicator.c b/drivers/hwtracing/coresight/coresight-replicator.c
index b6be73034996..a18d5e8fcba1 100644
--- a/drivers/hwtracing/coresight/coresight-replicator.c
+++ b/drivers/hwtracing/coresight/coresight-replicator.c
@@ -38,6 +38,7 @@ DEFINE_CORESIGHT_DEVLIST(replicator_devs, "replicator");
struct replicator_drvdata {
void __iomem *base;
struct clk *atclk;
+ struct clk *pclk;
struct coresight_device *csdev;
spinlock_t spinlock;
bool check_idfilter_val;
@@ -243,6 +244,10 @@ static int replicator_probe(struct device *dev, struct resource *res)
return ret;
}
+ drvdata->pclk = coresight_get_enable_apb_pclk(dev);
+ if (IS_ERR(drvdata->pclk))
+ return -ENODEV;
+
/*
* Map the device base for dynamic-replicator, which has been
* validated by AMBA core
@@ -301,16 +306,16 @@ static int replicator_remove(struct device *dev)
return 0;
}
-static int static_replicator_probe(struct platform_device *pdev)
+static int replicator_platform_probe(struct platform_device *pdev)
{
+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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);
+ ret = replicator_probe(&pdev->dev, res);
if (ret) {
pm_runtime_put_noidle(&pdev->dev);
@@ -320,7 +325,7 @@ static int static_replicator_probe(struct platform_device *pdev)
return ret;
}
-static int static_replicator_remove(struct platform_device *pdev)
+static int replicator_platform_remove(struct platform_device *pdev)
{
replicator_remove(&pdev->dev);
pm_runtime_disable(&pdev->dev);
@@ -335,6 +340,8 @@ static int replicator_runtime_suspend(struct device *dev)
if (drvdata && !IS_ERR(drvdata->atclk))
clk_disable_unprepare(drvdata->atclk);
+ if (drvdata && !IS_ERR(drvdata->pclk))
+ clk_disable_unprepare(drvdata->pclk);
return 0;
}
@@ -345,6 +352,8 @@ static int replicator_runtime_resume(struct device *dev)
if (drvdata && !IS_ERR(drvdata->atclk))
clk_prepare_enable(drvdata->atclk);
+ if (drvdata && !IS_ERR(drvdata->pclk))
+ clk_prepare_enable(drvdata->pclk);
return 0;
}
#endif
@@ -354,31 +363,32 @@ static const struct dev_pm_ops replicator_dev_pm_ops = {
replicator_runtime_resume, NULL)
};
-static const struct of_device_id static_replicator_match[] = {
+static const struct of_device_id replicator_match[] = {
{.compatible = "arm,coresight-replicator"},
{.compatible = "arm,coresight-static-replicator"},
{}
};
-MODULE_DEVICE_TABLE(of, static_replicator_match);
+MODULE_DEVICE_TABLE(of, replicator_match);
#ifdef CONFIG_ACPI
-static const struct acpi_device_id static_replicator_acpi_ids[] = {
+static const struct acpi_device_id replicator_acpi_ids[] = {
{"ARMHC985", 0}, /* ARM CoreSight Static Replicator */
+ {"ARMHC98D", 0}, /* ARM CoreSight Dynamic Replicator */
{}
};
-MODULE_DEVICE_TABLE(acpi, static_replicator_acpi_ids);
+MODULE_DEVICE_TABLE(acpi, replicator_acpi_ids);
#endif
-static struct platform_driver static_replicator_driver = {
- .probe = static_replicator_probe,
- .remove = static_replicator_remove,
+static struct platform_driver replicator_driver = {
+ .probe = replicator_platform_probe,
+ .remove = replicator_platform_remove,
.driver = {
- .name = "coresight-static-replicator",
+ .name = "coresight-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),
+ .of_match_table = of_match_ptr(replicator_match),
+ .acpi_match_table = ACPI_PTR(replicator_acpi_ids),
.pm = &replicator_dev_pm_ops,
.suppress_bind_attrs = true,
},
@@ -419,7 +429,7 @@ static int __init replicator_init(void)
{
int ret;
- ret = platform_driver_register(&static_replicator_driver);
+ ret = platform_driver_register(&replicator_driver);
if (ret) {
pr_info("Error registering platform driver\n");
return ret;
@@ -428,7 +438,7 @@ static int __init replicator_init(void)
ret = amba_driver_register(&dynamic_replicator_driver);
if (ret) {
pr_info("Error registering amba driver\n");
- platform_driver_unregister(&static_replicator_driver);
+ platform_driver_unregister(&replicator_driver);
}
return ret;
@@ -436,7 +446,7 @@ static int __init replicator_init(void)
static void __exit replicator_exit(void)
{
- platform_driver_unregister(&static_replicator_driver);
+ platform_driver_unregister(&replicator_driver);
amba_driver_unregister(&dynamic_replicator_driver);
}
--
2.25.1
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