[PATCH V4 10/11] coresight: stm: Move ACPI support from AMBA driver to platform driver

[Anshuman Khandual <anshuman.khandual@arm.com>]

Add support for the stm devices in the platform driver, which can then be
used on ACPI based platforms. This change would now allow runtime power
management for ACPI based systems. The driver would try to enable the APB
clock if available.

Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: James Clark <james.clark@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: linux-acpi@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: coresight@lists.linaro.org
Cc: linux-stm32@st-md-mailman.stormreply.com
Tested-by: Sudeep Holla <sudeep.holla@arm.com> # Boot and driver probe only
Acked-by: Sudeep Holla <sudeep.holla@arm.com> # For ACPI related changes
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
Changes in V4:

- Added pm_runtime_disable() in stm_platform_probe()

 drivers/acpi/arm64/amba.c                   |   1 -
 drivers/hwtracing/coresight/coresight-stm.c | 103 ++++++++++++++++++--
 2 files changed, 93 insertions(+), 11 deletions(-)

diff --git a/drivers/acpi/arm64/amba.c b/drivers/acpi/arm64/amba.c
index d3c1defa7bc8..bec0976541da 100644
--- a/drivers/acpi/arm64/amba.c
+++ b/drivers/acpi/arm64/amba.c
@@ -22,7 +22,6 @@
 static const struct acpi_device_id amba_id_list[] = {
 	{"ARMH0061", 0}, /* PL061 GPIO Device */
 	{"ARMH0330", 0}, /* ARM DMA Controller DMA-330 */
-	{"ARMHC502", 0}, /* ARM CoreSight STM */
 	{"ARMHC503", 0}, /* ARM CoreSight Debug */
 	{"", 0},
 };
diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 9cdca4f86cab..27fa0188121c 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -29,6 +29,8 @@
 #include <linux/perf_event.h>
 #include <linux/pm_runtime.h>
 #include <linux/stm.h>
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
 
 #include "coresight-priv.h"
 #include "coresight-trace-id.h"
@@ -115,6 +117,7 @@ DEFINE_CORESIGHT_DEVLIST(stm_devs, "stm");
  * struct stm_drvdata - specifics associated to an STM component
  * @base:		memory mapped base address for this component.
  * @atclk:		optional clock for the core parts of the STM.
+ * @pclk:		APB clock if present, otherwise NULL
  * @csdev:		component vitals needed by the framework.
  * @spinlock:		only one at a time pls.
  * @chs:		the channels accociated to this STM.
@@ -132,6 +135,7 @@ DEFINE_CORESIGHT_DEVLIST(stm_devs, "stm");
 struct stm_drvdata {
 	void __iomem		*base;
 	struct clk		*atclk;
+	struct clk		*pclk;
 	struct coresight_device	*csdev;
 	spinlock_t		spinlock;
 	struct channel_space	chs;
@@ -816,14 +820,12 @@ static char *stm_csdev_name(struct coresight_device *csdev)
 	return uci_data ? (char *)uci_data : "STM";
 }
 
-static int stm_probe(struct amba_device *adev, const struct amba_id *id)
+static int __stm_probe(struct device *dev, struct resource *res)
 {
 	int ret, trace_id;
 	void __iomem *base;
-	struct device *dev = &adev->dev;
 	struct coresight_platform_data *pdata = NULL;
 	struct stm_drvdata *drvdata;
-	struct resource *res = &adev->res;
 	struct resource ch_res;
 	struct coresight_desc desc = { 0 };
 
@@ -835,12 +837,16 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	if (!drvdata)
 		return -ENOMEM;
 
-	drvdata->atclk = devm_clk_get(&adev->dev, "atclk"); /* optional */
+	drvdata->atclk = devm_clk_get(dev, "atclk"); /* optional */
 	if (!IS_ERR(drvdata->atclk)) {
 		ret = clk_prepare_enable(drvdata->atclk);
 		if (ret)
 			return ret;
 	}
+
+	drvdata->pclk = coresight_get_enable_apb_pclk(dev);
+	if (IS_ERR(drvdata->pclk))
+		return -ENODEV;
 	dev_set_drvdata(dev, drvdata);
 
 	base = devm_ioremap_resource(dev, res);
@@ -888,7 +894,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 		ret = PTR_ERR(pdata);
 		goto stm_unregister;
 	}
-	adev->dev.platform_data = pdata;
+	dev->platform_data = pdata;
 
 	desc.type = CORESIGHT_DEV_TYPE_SOURCE;
 	desc.subtype.source_subtype = CORESIGHT_DEV_SUBTYPE_SOURCE_SOFTWARE;
@@ -909,8 +915,6 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	}
 	drvdata->traceid = (u8)trace_id;
 
-	pm_runtime_put(&adev->dev);
-
 	dev_info(&drvdata->csdev->dev, "%s initialized\n",
 		 stm_csdev_name(drvdata->csdev));
 	return 0;
@@ -923,9 +927,20 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
 	return ret;
 }
 
-static void stm_remove(struct amba_device *adev)
+static int stm_probe(struct amba_device *adev, const struct amba_id *id)
+{
+	int ret;
+
+	ret = __stm_probe(&adev->dev, &adev->res);
+	if (!ret)
+		pm_runtime_put(&adev->dev);
+
+	return ret;
+}
+
+static void __stm_remove(struct device *dev)
 {
-	struct stm_drvdata *drvdata = dev_get_drvdata(&adev->dev);
+	struct stm_drvdata *drvdata = dev_get_drvdata(dev);
 
 	coresight_trace_id_put_system_id(drvdata->traceid);
 	coresight_unregister(drvdata->csdev);
@@ -933,6 +948,11 @@ static void stm_remove(struct amba_device *adev)
 	stm_unregister_device(&drvdata->stm);
 }
 
+static void stm_remove(struct amba_device *adev)
+{
+	__stm_remove(&adev->dev);
+}
+
 #ifdef CONFIG_PM
 static int stm_runtime_suspend(struct device *dev)
 {
@@ -941,6 +961,8 @@ static int stm_runtime_suspend(struct device *dev)
 	if (drvdata && !IS_ERR(drvdata->atclk))
 		clk_disable_unprepare(drvdata->atclk);
 
+	if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
+		clk_disable_unprepare(drvdata->pclk);
 	return 0;
 }
 
@@ -951,6 +973,8 @@ static int stm_runtime_resume(struct device *dev)
 	if (drvdata && !IS_ERR(drvdata->atclk))
 		clk_prepare_enable(drvdata->atclk);
 
+	if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
+		clk_prepare_enable(drvdata->pclk);
 	return 0;
 }
 #endif
@@ -979,7 +1003,66 @@ static struct amba_driver stm_driver = {
 	.id_table	= stm_ids,
 };
 
-module_amba_driver(stm_driver);
+static int stm_platform_probe(struct platform_device *pdev)
+{
+	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	int ret = 0;
+
+	pm_runtime_get_noresume(&pdev->dev);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	ret = __stm_probe(&pdev->dev, res);
+	pm_runtime_put(&pdev->dev);
+	if (ret)
+		pm_runtime_disable(&pdev->dev);
+
+	return ret;
+}
+
+static int stm_platform_remove(struct platform_device *pdev)
+{
+	struct stm_drvdata *drvdata = dev_get_drvdata(&pdev->dev);
+
+	if (drvdata)
+		__stm_remove(&pdev->dev);
+
+	pm_runtime_disable(&pdev->dev);
+	if (drvdata && !IS_ERR_OR_NULL(drvdata->pclk))
+		clk_put(drvdata->pclk);
+	return 0;
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id stm_acpi_ids[] = {
+	{"ARMHC502", 0}, /* ARM CoreSight STM */
+	{},
+};
+MODULE_DEVICE_TABLE(acpi, stm_acpi_ids);
+#endif
+
+static struct platform_driver stm_platform_driver = {
+	.probe	= stm_platform_probe,
+	.remove	= stm_platform_remove,
+	.driver	= {
+		.name			= "coresight-stm-platform",
+		.acpi_match_table	= ACPI_PTR(stm_acpi_ids),
+		.suppress_bind_attrs	= true,
+		.pm			= &stm_dev_pm_ops,
+	},
+};
+
+static int __init stm_init(void)
+{
+	return coresight_init_driver("stm", &stm_driver, &stm_platform_driver);
+}
+
+static void __exit stm_exit(void)
+{
+	coresight_remove_driver(&stm_driver, &stm_platform_driver);
+}
+module_init(stm_init);
+module_exit(stm_exit);
 
 MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>");
 MODULE_DESCRIPTION("Arm CoreSight System Trace Macrocell driver");
-- 
2.25.1


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