| Message ID | 20231201062053.1268492-4-anshuman.khandual@arm.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | coresight: Move remaining AMBA ACPI devices into platform driver | expand |
On Fri, Dec 01, 2023 at 11:50:49AM +0530, Anshuman Khandual wrote: > Add support for the catu devices in a new 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> Acked-by: Sudeep Holla <sudeep.holla@arm.com> # For ACPI related changes
Hi Anshuman, On 01/12/2023 06:20, Anshuman Khandual wrote: > Add support for the catu devices in a new 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. This doesn't talk about the new helper. As such I would prefer that to be a separate preparatory patch. See below. > > 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: linux-acpi@vger.kernel.org > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > Cc: coresight@lists.linaro.org > Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> > --- > drivers/acpi/arm64/amba.c | 1 - > drivers/hwtracing/coresight/coresight-catu.c | 130 ++++++++++++++++--- > drivers/hwtracing/coresight/coresight-catu.h | 1 + > drivers/hwtracing/coresight/coresight-core.c | 29 +++++ > include/linux/coresight.h | 7 + > 5 files changed, 149 insertions(+), 19 deletions(-) > > diff --git a/drivers/acpi/arm64/amba.c b/drivers/acpi/arm64/amba.c > index afb6afb66967..587061b0fd2f 100644 > --- a/drivers/acpi/arm64/amba.c > +++ b/drivers/acpi/arm64/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 */ > - {"ARMHC9CA", 0}, /* ARM CoreSight CATU */ > {"", 0}, > }; > > diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c > index 3949ded0d4fa..ba5ee7d158dd 100644 > --- a/drivers/hwtracing/coresight/coresight-catu.c > +++ b/drivers/hwtracing/coresight/coresight-catu.c > @@ -7,6 +7,8 @@ > * Author: Suzuki K Poulose <suzuki.poulose@arm.com> > */ > > +#include <linux/platform_device.h> > +#include <linux/acpi.h> > #include <linux/amba/bus.h> > #include <linux/device.h> > #include <linux/dma-mapping.h> > @@ -502,28 +504,20 @@ static const struct coresight_ops catu_ops = { > .helper_ops = &catu_helper_ops, > }; > > -static int catu_probe(struct amba_device *adev, const struct amba_id *id) > +static int __catu_probe(struct device *dev, struct resource *res) > { > int ret = 0; > u32 dma_mask; > - struct catu_drvdata *drvdata; > + struct catu_drvdata *drvdata = dev_get_drvdata(dev); > struct coresight_desc catu_desc; > struct coresight_platform_data *pdata = NULL; > - struct device *dev = &adev->dev; > void __iomem *base; > > catu_desc.name = coresight_alloc_device_name(&catu_devs, dev); > if (!catu_desc.name) > return -ENOMEM; > > - drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); > - if (!drvdata) { > - ret = -ENOMEM; > - goto out; > - } > - > - dev_set_drvdata(dev, drvdata); > - base = devm_ioremap_resource(dev, &adev->res); > + base = devm_ioremap_resource(dev, res); > if (IS_ERR(base)) { > ret = PTR_ERR(base); > goto out; > @@ -568,18 +562,35 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id) > if (IS_ERR(drvdata->csdev)) > ret = PTR_ERR(drvdata->csdev); > else > - pm_runtime_put(&adev->dev); > + pm_runtime_put(dev); > out: > return ret; > } > > -static void catu_remove(struct amba_device *adev) > +static int catu_probe(struct amba_device *adev, const struct amba_id *id) > +{ > + struct catu_drvdata *drvdata; > + > + drvdata = devm_kzalloc(&adev->dev, sizeof(*drvdata), GFP_KERNEL); > + if (!drvdata) > + return -ENOMEM; > + > + amba_set_drvdata(adev, drvdata); > + return __catu_probe(&adev->dev, &adev->res); > +} > + > +static void __catu_remove(struct device *dev) > { > - struct catu_drvdata *drvdata = dev_get_drvdata(&adev->dev); > + struct catu_drvdata *drvdata = dev_get_drvdata(dev); > > coresight_unregister(drvdata->csdev); > } > > +static void catu_remove(struct amba_device *adev) > +{ > + __catu_remove(&adev->dev); > +} > + > static struct amba_id catu_ids[] = { > CS_AMBA_ID(0x000bb9ee), > {}, > @@ -598,13 +609,96 @@ static struct amba_driver catu_driver = { > .id_table = catu_ids, > }; > > +static int catu_platform_probe(struct platform_device *pdev) > +{ > + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + struct catu_drvdata *drvdata; > + int ret = 0; > + > + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); > + if (!drvdata) > + return -ENOMEM; > + > + drvdata->pclk = coresight_get_enable_apb_pclk(&pdev->dev); > + if (IS_ERR(drvdata->pclk)) > + return -ENODEV; > + > + if (res) { > + drvdata->base = devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(drvdata->base)) { > + clk_put(drvdata->pclk); > + return PTR_ERR(drvdata->base); > + } > + } > + > + pm_runtime_get_noresume(&pdev->dev); > + pm_runtime_set_active(&pdev->dev); > + pm_runtime_enable(&pdev->dev); > + > + dev_set_drvdata(&pdev->dev, drvdata); > + ret = __catu_probe(&pdev->dev, res); > + if (ret) { > + pm_runtime_put_noidle(&pdev->dev); > + pm_runtime_disable(&pdev->dev); > + } > + return ret; > +} > + > +static int catu_platform_remove(struct platform_device *pdev) > +{ > + __catu_remove(&pdev->dev); > + return 0; > +} > + > +#ifdef CONFIG_PM > +static int catu_runtime_suspend(struct device *dev) > +{ > + struct catu_drvdata *drvdata = dev_get_drvdata(dev); > + > + if (drvdata->pclk && !IS_ERR_OR_NULL(drvdata->pclk)) Only the second part is needed. IS_ERR_OR_NULL() already checks for NULL. > + clk_disable_unprepare(drvdata->pclk); > + return 0; > +} > + > +static int catu_runtime_resume(struct device *dev) > +{ > + struct catu_drvdata *drvdata = dev_get_drvdata(dev); > + > + if (drvdata->pclk && !IS_ERR_OR_NULL(drvdata->pclk)) Same here. > + clk_prepare_enable(drvdata->pclk); > + return 0; > +} > +#endif > + > +static const struct dev_pm_ops catu_dev_pm_ops = { > + SET_RUNTIME_PM_OPS(catu_runtime_suspend, catu_runtime_resume, NULL) > +}; > + > +#ifdef CONFIG_ACPI > +static const struct acpi_device_id catu_acpi_ids[] = { > + {"ARMHC9CA", 0}, /* ARM CoreSight CATU */ > + {}, > +}; > + > +MODULE_DEVICE_TABLE(acpi, catu_acpi_ids); > +#endif > + > +static struct platform_driver catu_platform_driver = { > + .probe = catu_platform_probe, > + .remove = catu_platform_remove, > + .driver = { > + .name = "coresight-catu-platform", > + .acpi_match_table = ACPI_PTR(catu_acpi_ids), > + .suppress_bind_attrs = true, > + .pm = &catu_dev_pm_ops, > + }, > +}; > + > static int __init catu_init(void) > { > int ret; > > - ret = amba_driver_register(&catu_driver); > - if (ret) > - pr_info("Error registering catu driver\n"); > + ret = coresight_init_driver("catu", &catu_driver, &catu_platform_driver); > tmc_etr_set_catu_ops(&etr_catu_buf_ops); > return ret; > } > @@ -612,7 +706,7 @@ static int __init catu_init(void) > static void __exit catu_exit(void) > { > tmc_etr_remove_catu_ops(); > - amba_driver_unregister(&catu_driver); > + coresight_remove_driver(&catu_driver, &catu_platform_driver); > } > > module_init(catu_init); > diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h > index 442e034bbfba..141feac1c14b 100644 > --- a/drivers/hwtracing/coresight/coresight-catu.h > +++ b/drivers/hwtracing/coresight/coresight-catu.h > @@ -61,6 +61,7 @@ > #define CATU_IRQEN_OFF 0x0 > > struct catu_drvdata { > + struct clk *pclk; > void __iomem *base; > struct coresight_device *csdev; > int irq; > diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c > index 9fabe00a40d6..ede9b0723f95 100644 > --- a/drivers/hwtracing/coresight/coresight-core.c > +++ b/drivers/hwtracing/coresight/coresight-core.c > @@ -1833,6 +1833,35 @@ static void __exit coresight_exit(void) > module_init(coresight_init); > module_exit(coresight_exit); > ---8>--- > +int coresight_init_driver(const char *drv, struct amba_driver *amba_drv, > + struct platform_driver *pdev_drv) > +{ > + int ret; > + > + ret = amba_driver_register(amba_drv); > + if (ret) { > + pr_err("%s: error registering AMBA driver\n", drv); > + return ret; > + } > + > + ret = platform_driver_register(pdev_drv); > + if (!ret) > + return 0; > + > + pr_err("%s: error registering platform driver\n", drv); > + amba_driver_unregister(amba_drv); > + return ret; > +} > +EXPORT_SYMBOL_GPL(coresight_init_driver); > + > +void coresight_remove_driver(struct amba_driver *amba_drv, > + struct platform_driver *pdev_drv) > +{ > + amba_driver_unregister(amba_drv); > + platform_driver_unregister(pdev_drv); > +} > +EXPORT_SYMBOL_GPL(coresight_remove_driver); Please could we split this into a separate patch itself ? Also, can we not use them for the other components ? funnel, replicator ? > + > MODULE_LICENSE("GPL v2"); > MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>"); > MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>"); > diff --git a/include/linux/coresight.h b/include/linux/coresight.h > index a269fffaf991..be7fe3793763 100644 > --- a/include/linux/coresight.h > +++ b/include/linux/coresight.h > @@ -12,6 +12,8 @@ > #include <linux/io.h> > #include <linux/perf_event.h> > #include <linux/sched.h> > +#include <linux/amba/bus.h> > +#include <linux/platform_device.h> > > /* Peripheral id registers (0xFD0-0xFEC) */ > #define CORESIGHT_PERIPHIDR4 0xfd0 > @@ -597,6 +599,11 @@ void coresight_relaxed_write64(struct coresight_device *csdev, > u64 val, u32 offset); > void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset); > > +int coresight_init_driver(const char *drv, struct amba_driver *amba_drv, > + struct platform_driver *pdev_drv); > + > +void coresight_remove_driver(struct amba_driver *amba_drv, > + struct platform_driver *pdev_drv); > #else > static inline struct coresight_device * > coresight_register(struct coresight_desc *desc) { return NULL; } Suzuki
On 12/1/23 19:11, Suzuki K Poulose wrote: > Hi Anshuman, > > On 01/12/2023 06:20, Anshuman Khandual wrote: >> Add support for the catu devices in a new 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. > > This doesn't talk about the new helper. As such I would prefer that to be a separate preparatory patch. See below. Makes sense. > >> >> 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: linux-acpi@vger.kernel.org >> Cc: linux-arm-kernel@lists.infradead.org >> Cc: linux-kernel@vger.kernel.org >> Cc: coresight@lists.linaro.org >> Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> >> --- >> drivers/acpi/arm64/amba.c | 1 - >> drivers/hwtracing/coresight/coresight-catu.c | 130 ++++++++++++++++--- >> drivers/hwtracing/coresight/coresight-catu.h | 1 + >> drivers/hwtracing/coresight/coresight-core.c | 29 +++++ >> include/linux/coresight.h | 7 + >> 5 files changed, 149 insertions(+), 19 deletions(-) >> >> diff --git a/drivers/acpi/arm64/amba.c b/drivers/acpi/arm64/amba.c >> index afb6afb66967..587061b0fd2f 100644 >> --- a/drivers/acpi/arm64/amba.c >> +++ b/drivers/acpi/arm64/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 */ >> - {"ARMHC9CA", 0}, /* ARM CoreSight CATU */ >> {"", 0}, >> }; >> diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c >> index 3949ded0d4fa..ba5ee7d158dd 100644 >> --- a/drivers/hwtracing/coresight/coresight-catu.c >> +++ b/drivers/hwtracing/coresight/coresight-catu.c >> @@ -7,6 +7,8 @@ >> * Author: Suzuki K Poulose <suzuki.poulose@arm.com> >> */ >> +#include <linux/platform_device.h> >> +#include <linux/acpi.h> >> #include <linux/amba/bus.h> >> #include <linux/device.h> >> #include <linux/dma-mapping.h> >> @@ -502,28 +504,20 @@ static const struct coresight_ops catu_ops = { >> .helper_ops = &catu_helper_ops, >> }; >> -static int catu_probe(struct amba_device *adev, const struct amba_id *id) >> +static int __catu_probe(struct device *dev, struct resource *res) >> { >> int ret = 0; >> u32 dma_mask; >> - struct catu_drvdata *drvdata; >> + struct catu_drvdata *drvdata = dev_get_drvdata(dev); >> struct coresight_desc catu_desc; >> struct coresight_platform_data *pdata = NULL; >> - struct device *dev = &adev->dev; >> void __iomem *base; >> catu_desc.name = coresight_alloc_device_name(&catu_devs, dev); >> if (!catu_desc.name) >> return -ENOMEM; >> - drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); >> - if (!drvdata) { >> - ret = -ENOMEM; >> - goto out; >> - } >> - >> - dev_set_drvdata(dev, drvdata); >> - base = devm_ioremap_resource(dev, &adev->res); >> + base = devm_ioremap_resource(dev, res); >> if (IS_ERR(base)) { >> ret = PTR_ERR(base); >> goto out; >> @@ -568,18 +562,35 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id) >> if (IS_ERR(drvdata->csdev)) >> ret = PTR_ERR(drvdata->csdev); >> else >> - pm_runtime_put(&adev->dev); >> + pm_runtime_put(dev); >> out: >> return ret; >> } >> -static void catu_remove(struct amba_device *adev) >> +static int catu_probe(struct amba_device *adev, const struct amba_id *id) >> +{ >> + struct catu_drvdata *drvdata; >> + >> + drvdata = devm_kzalloc(&adev->dev, sizeof(*drvdata), GFP_KERNEL); >> + if (!drvdata) >> + return -ENOMEM; >> + >> + amba_set_drvdata(adev, drvdata); >> + return __catu_probe(&adev->dev, &adev->res); >> +} >> + >> +static void __catu_remove(struct device *dev) >> { >> - struct catu_drvdata *drvdata = dev_get_drvdata(&adev->dev); >> + struct catu_drvdata *drvdata = dev_get_drvdata(dev); >> coresight_unregister(drvdata->csdev); >> } >> +static void catu_remove(struct amba_device *adev) >> +{ >> + __catu_remove(&adev->dev); >> +} >> + >> static struct amba_id catu_ids[] = { >> CS_AMBA_ID(0x000bb9ee), >> {}, >> @@ -598,13 +609,96 @@ static struct amba_driver catu_driver = { >> .id_table = catu_ids, >> }; >> +static int catu_platform_probe(struct platform_device *pdev) >> +{ >> + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); >> + struct catu_drvdata *drvdata; >> + int ret = 0; >> + >> + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); >> + if (!drvdata) >> + return -ENOMEM; >> + >> + drvdata->pclk = coresight_get_enable_apb_pclk(&pdev->dev); >> + if (IS_ERR(drvdata->pclk)) >> + return -ENODEV; >> + >> + if (res) { >> + drvdata->base = devm_ioremap_resource(&pdev->dev, res); >> + if (IS_ERR(drvdata->base)) { >> + clk_put(drvdata->pclk); >> + return PTR_ERR(drvdata->base); >> + } >> + } >> + >> + pm_runtime_get_noresume(&pdev->dev); >> + pm_runtime_set_active(&pdev->dev); >> + pm_runtime_enable(&pdev->dev); >> + >> + dev_set_drvdata(&pdev->dev, drvdata); >> + ret = __catu_probe(&pdev->dev, res); >> + if (ret) { >> + pm_runtime_put_noidle(&pdev->dev); >> + pm_runtime_disable(&pdev->dev); >> + } >> + return ret; >> +} >> + >> +static int catu_platform_remove(struct platform_device *pdev) >> +{ >> + __catu_remove(&pdev->dev); >> + return 0; >> +} >> + >> +#ifdef CONFIG_PM >> +static int catu_runtime_suspend(struct device *dev) >> +{ >> + struct catu_drvdata *drvdata = dev_get_drvdata(dev); >> + >> + if (drvdata->pclk && !IS_ERR_OR_NULL(drvdata->pclk)) > > Only the second part is needed. IS_ERR_OR_NULL() already checks for NULL. Actually, the first check here should be for valid drvdata instead, ensuring that subsequent de-referencing for drvdata->pclk does not crash. Will do this replacement for all affected patches. > >> + clk_disable_unprepare(drvdata->pclk); >> + return 0; >> +} >> + >> +static int catu_runtime_resume(struct device *dev) >> +{ >> + struct catu_drvdata *drvdata = dev_get_drvdata(dev); >> + >> + if (drvdata->pclk && !IS_ERR_OR_NULL(drvdata->pclk)) > > Same here. > >> + clk_prepare_enable(drvdata->pclk); >> + return 0; >> +} >> +#endif >> + >> +static const struct dev_pm_ops catu_dev_pm_ops = { >> + SET_RUNTIME_PM_OPS(catu_runtime_suspend, catu_runtime_resume, NULL) >> +}; >> + >> +#ifdef CONFIG_ACPI >> +static const struct acpi_device_id catu_acpi_ids[] = { >> + {"ARMHC9CA", 0}, /* ARM CoreSight CATU */ >> + {}, >> +}; >> + >> +MODULE_DEVICE_TABLE(acpi, catu_acpi_ids); >> +#endif >> + >> +static struct platform_driver catu_platform_driver = { >> + .probe = catu_platform_probe, >> + .remove = catu_platform_remove, >> + .driver = { >> + .name = "coresight-catu-platform", >> + .acpi_match_table = ACPI_PTR(catu_acpi_ids), >> + .suppress_bind_attrs = true, >> + .pm = &catu_dev_pm_ops, >> + }, >> +}; >> + >> static int __init catu_init(void) >> { >> int ret; >> - ret = amba_driver_register(&catu_driver); >> - if (ret) >> - pr_info("Error registering catu driver\n"); >> + ret = coresight_init_driver("catu", &catu_driver, &catu_platform_driver); >> tmc_etr_set_catu_ops(&etr_catu_buf_ops); >> return ret; >> } >> @@ -612,7 +706,7 @@ static int __init catu_init(void) >> static void __exit catu_exit(void) >> { >> tmc_etr_remove_catu_ops(); >> - amba_driver_unregister(&catu_driver); >> + coresight_remove_driver(&catu_driver, &catu_platform_driver); >> } >> module_init(catu_init); >> diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h >> index 442e034bbfba..141feac1c14b 100644 >> --- a/drivers/hwtracing/coresight/coresight-catu.h >> +++ b/drivers/hwtracing/coresight/coresight-catu.h >> @@ -61,6 +61,7 @@ >> #define CATU_IRQEN_OFF 0x0 >> struct catu_drvdata { >> + struct clk *pclk; >> void __iomem *base; >> struct coresight_device *csdev; >> int irq; >> diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c >> index 9fabe00a40d6..ede9b0723f95 100644 >> --- a/drivers/hwtracing/coresight/coresight-core.c >> +++ b/drivers/hwtracing/coresight/coresight-core.c >> @@ -1833,6 +1833,35 @@ static void __exit coresight_exit(void) >> module_init(coresight_init); >> module_exit(coresight_exit); >> > > ---8>--- > >> +int coresight_init_driver(const char *drv, struct amba_driver *amba_drv, >> + struct platform_driver *pdev_drv) >> +{ >> + int ret; >> + >> + ret = amba_driver_register(amba_drv); >> + if (ret) { >> + pr_err("%s: error registering AMBA driver\n", drv); >> + return ret; >> + } >> + >> + ret = platform_driver_register(pdev_drv); >> + if (!ret) >> + return 0; >> + >> + pr_err("%s: error registering platform driver\n", drv); >> + amba_driver_unregister(amba_drv); >> + return ret; >> +} >> +EXPORT_SYMBOL_GPL(coresight_init_driver); >> + >> +void coresight_remove_driver(struct amba_driver *amba_drv, >> + struct platform_driver *pdev_drv) >> +{ >> + amba_driver_unregister(amba_drv); >> + platform_driver_unregister(pdev_drv); >> +} >> +EXPORT_SYMBOL_GPL(coresight_remove_driver); > > Please could we split this into a separate patch itself ? Also, can we not use them for the other components ? funnel, replicator ? Sure, will split the helpers addition along with their header changes into a separate patch at the beginning of this series, and then use them for funnel and replicator devices in subsequent patches. > > >> + >> MODULE_LICENSE("GPL v2"); >> MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>"); >> MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>"); >> diff --git a/include/linux/coresight.h b/include/linux/coresight.h >> index a269fffaf991..be7fe3793763 100644 >> --- a/include/linux/coresight.h >> +++ b/include/linux/coresight.h >> @@ -12,6 +12,8 @@ >> #include <linux/io.h> >> #include <linux/perf_event.h> >> #include <linux/sched.h> >> +#include <linux/amba/bus.h> >> +#include <linux/platform_device.h> >> /* Peripheral id registers (0xFD0-0xFEC) */ >> #define CORESIGHT_PERIPHIDR4 0xfd0 >> @@ -597,6 +599,11 @@ void coresight_relaxed_write64(struct coresight_device *csdev, >> u64 val, u32 offset); >> void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset); >> +int coresight_init_driver(const char *drv, struct amba_driver *amba_drv, >> + struct platform_driver *pdev_drv); >> + >> +void coresight_remove_driver(struct amba_driver *amba_drv, >> + struct platform_driver *pdev_drv); >> #else >> static inline struct coresight_device * >> coresight_register(struct coresight_desc *desc) { return NULL; } > > > Suzuki
diff --git a/drivers/acpi/arm64/amba.c b/drivers/acpi/arm64/amba.c index afb6afb66967..587061b0fd2f 100644 --- a/drivers/acpi/arm64/amba.c +++ b/drivers/acpi/arm64/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 */ - {"ARMHC9CA", 0}, /* ARM CoreSight CATU */ {"", 0}, }; diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c index 3949ded0d4fa..ba5ee7d158dd 100644 --- a/drivers/hwtracing/coresight/coresight-catu.c +++ b/drivers/hwtracing/coresight/coresight-catu.c @@ -7,6 +7,8 @@ * Author: Suzuki K Poulose <suzuki.poulose@arm.com> */ +#include <linux/platform_device.h> +#include <linux/acpi.h> #include <linux/amba/bus.h> #include <linux/device.h> #include <linux/dma-mapping.h> @@ -502,28 +504,20 @@ static const struct coresight_ops catu_ops = { .helper_ops = &catu_helper_ops, }; -static int catu_probe(struct amba_device *adev, const struct amba_id *id) +static int __catu_probe(struct device *dev, struct resource *res) { int ret = 0; u32 dma_mask; - struct catu_drvdata *drvdata; + struct catu_drvdata *drvdata = dev_get_drvdata(dev); struct coresight_desc catu_desc; struct coresight_platform_data *pdata = NULL; - struct device *dev = &adev->dev; void __iomem *base; catu_desc.name = coresight_alloc_device_name(&catu_devs, dev); if (!catu_desc.name) return -ENOMEM; - drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); - if (!drvdata) { - ret = -ENOMEM; - goto out; - } - - dev_set_drvdata(dev, drvdata); - base = devm_ioremap_resource(dev, &adev->res); + base = devm_ioremap_resource(dev, res); if (IS_ERR(base)) { ret = PTR_ERR(base); goto out; @@ -568,18 +562,35 @@ static int catu_probe(struct amba_device *adev, const struct amba_id *id) if (IS_ERR(drvdata->csdev)) ret = PTR_ERR(drvdata->csdev); else - pm_runtime_put(&adev->dev); + pm_runtime_put(dev); out: return ret; } -static void catu_remove(struct amba_device *adev) +static int catu_probe(struct amba_device *adev, const struct amba_id *id) +{ + struct catu_drvdata *drvdata; + + drvdata = devm_kzalloc(&adev->dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + amba_set_drvdata(adev, drvdata); + return __catu_probe(&adev->dev, &adev->res); +} + +static void __catu_remove(struct device *dev) { - struct catu_drvdata *drvdata = dev_get_drvdata(&adev->dev); + struct catu_drvdata *drvdata = dev_get_drvdata(dev); coresight_unregister(drvdata->csdev); } +static void catu_remove(struct amba_device *adev) +{ + __catu_remove(&adev->dev); +} + static struct amba_id catu_ids[] = { CS_AMBA_ID(0x000bb9ee), {}, @@ -598,13 +609,96 @@ static struct amba_driver catu_driver = { .id_table = catu_ids, }; +static int catu_platform_probe(struct platform_device *pdev) +{ + struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + struct catu_drvdata *drvdata; + int ret = 0; + + drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + drvdata->pclk = coresight_get_enable_apb_pclk(&pdev->dev); + if (IS_ERR(drvdata->pclk)) + return -ENODEV; + + if (res) { + drvdata->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(drvdata->base)) { + clk_put(drvdata->pclk); + return PTR_ERR(drvdata->base); + } + } + + pm_runtime_get_noresume(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + dev_set_drvdata(&pdev->dev, drvdata); + ret = __catu_probe(&pdev->dev, res); + if (ret) { + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); + } + return ret; +} + +static int catu_platform_remove(struct platform_device *pdev) +{ + __catu_remove(&pdev->dev); + return 0; +} + +#ifdef CONFIG_PM +static int catu_runtime_suspend(struct device *dev) +{ + struct catu_drvdata *drvdata = dev_get_drvdata(dev); + + if (drvdata->pclk && !IS_ERR_OR_NULL(drvdata->pclk)) + clk_disable_unprepare(drvdata->pclk); + return 0; +} + +static int catu_runtime_resume(struct device *dev) +{ + struct catu_drvdata *drvdata = dev_get_drvdata(dev); + + if (drvdata->pclk && !IS_ERR_OR_NULL(drvdata->pclk)) + clk_prepare_enable(drvdata->pclk); + return 0; +} +#endif + +static const struct dev_pm_ops catu_dev_pm_ops = { + SET_RUNTIME_PM_OPS(catu_runtime_suspend, catu_runtime_resume, NULL) +}; + +#ifdef CONFIG_ACPI +static const struct acpi_device_id catu_acpi_ids[] = { + {"ARMHC9CA", 0}, /* ARM CoreSight CATU */ + {}, +}; + +MODULE_DEVICE_TABLE(acpi, catu_acpi_ids); +#endif + +static struct platform_driver catu_platform_driver = { + .probe = catu_platform_probe, + .remove = catu_platform_remove, + .driver = { + .name = "coresight-catu-platform", + .acpi_match_table = ACPI_PTR(catu_acpi_ids), + .suppress_bind_attrs = true, + .pm = &catu_dev_pm_ops, + }, +}; + static int __init catu_init(void) { int ret; - ret = amba_driver_register(&catu_driver); - if (ret) - pr_info("Error registering catu driver\n"); + ret = coresight_init_driver("catu", &catu_driver, &catu_platform_driver); tmc_etr_set_catu_ops(&etr_catu_buf_ops); return ret; } @@ -612,7 +706,7 @@ static int __init catu_init(void) static void __exit catu_exit(void) { tmc_etr_remove_catu_ops(); - amba_driver_unregister(&catu_driver); + coresight_remove_driver(&catu_driver, &catu_platform_driver); } module_init(catu_init); diff --git a/drivers/hwtracing/coresight/coresight-catu.h b/drivers/hwtracing/coresight/coresight-catu.h index 442e034bbfba..141feac1c14b 100644 --- a/drivers/hwtracing/coresight/coresight-catu.h +++ b/drivers/hwtracing/coresight/coresight-catu.h @@ -61,6 +61,7 @@ #define CATU_IRQEN_OFF 0x0 struct catu_drvdata { + struct clk *pclk; void __iomem *base; struct coresight_device *csdev; int irq; diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c index 9fabe00a40d6..ede9b0723f95 100644 --- a/drivers/hwtracing/coresight/coresight-core.c +++ b/drivers/hwtracing/coresight/coresight-core.c @@ -1833,6 +1833,35 @@ static void __exit coresight_exit(void) module_init(coresight_init); module_exit(coresight_exit); +int coresight_init_driver(const char *drv, struct amba_driver *amba_drv, + struct platform_driver *pdev_drv) +{ + int ret; + + ret = amba_driver_register(amba_drv); + if (ret) { + pr_err("%s: error registering AMBA driver\n", drv); + return ret; + } + + ret = platform_driver_register(pdev_drv); + if (!ret) + return 0; + + pr_err("%s: error registering platform driver\n", drv); + amba_driver_unregister(amba_drv); + return ret; +} +EXPORT_SYMBOL_GPL(coresight_init_driver); + +void coresight_remove_driver(struct amba_driver *amba_drv, + struct platform_driver *pdev_drv) +{ + amba_driver_unregister(amba_drv); + platform_driver_unregister(pdev_drv); +} +EXPORT_SYMBOL_GPL(coresight_remove_driver); + MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Pratik Patel <pratikp@codeaurora.org>"); MODULE_AUTHOR("Mathieu Poirier <mathieu.poirier@linaro.org>"); diff --git a/include/linux/coresight.h b/include/linux/coresight.h index a269fffaf991..be7fe3793763 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -12,6 +12,8 @@ #include <linux/io.h> #include <linux/perf_event.h> #include <linux/sched.h> +#include <linux/amba/bus.h> +#include <linux/platform_device.h> /* Peripheral id registers (0xFD0-0xFEC) */ #define CORESIGHT_PERIPHIDR4 0xfd0 @@ -597,6 +599,11 @@ void coresight_relaxed_write64(struct coresight_device *csdev, u64 val, u32 offset); void coresight_write64(struct coresight_device *csdev, u64 val, u32 offset); +int coresight_init_driver(const char *drv, struct amba_driver *amba_drv, + struct platform_driver *pdev_drv); + +void coresight_remove_driver(struct amba_driver *amba_drv, + struct platform_driver *pdev_drv); #else static inline struct coresight_device * coresight_register(struct coresight_desc *desc) { return NULL; }
Add support for the catu devices in a new 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: linux-acpi@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: coresight@lists.linaro.org Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com> --- drivers/acpi/arm64/amba.c | 1 - drivers/hwtracing/coresight/coresight-catu.c | 130 ++++++++++++++++--- drivers/hwtracing/coresight/coresight-catu.h | 1 + drivers/hwtracing/coresight/coresight-core.c | 29 +++++ include/linux/coresight.h | 7 + 5 files changed, 149 insertions(+), 19 deletions(-)