| Message ID | 20180709155104.25528-5-georgi.djakov@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Introduce on-chip interconnect API | expand |
On Mon, Jul 9, 2018 at 8:51 AM Georgi Djakov <georgi.djakov@linaro.org> wrote: > > On some Qualcomm SoCs, there is a remote processor, which controls some of > the Network-On-Chip interconnect resources. Other CPUs express their needs > by communicating with this processor. Add a driver to handle communication > with this remote processor. > > Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> > --- > .../bindings/interconnect/qcom-smd.txt | 32 +++++++ > drivers/interconnect/qcom/Kconfig | 11 +++ > drivers/interconnect/qcom/Makefile | 2 + > drivers/interconnect/qcom/smd-rpm.c | 91 +++++++++++++++++++ > drivers/interconnect/qcom/smd-rpm.h | 15 +++ > 5 files changed, 151 insertions(+) > create mode 100644 Documentation/devicetree/bindings/interconnect/qcom-smd.txt > create mode 100644 drivers/interconnect/qcom/Kconfig > create mode 100644 drivers/interconnect/qcom/Makefile > create mode 100644 drivers/interconnect/qcom/smd-rpm.c > create mode 100644 drivers/interconnect/qcom/smd-rpm.h > > diff --git a/Documentation/devicetree/bindings/interconnect/qcom-smd.txt b/Documentation/devicetree/bindings/interconnect/qcom-smd.txt > new file mode 100644 > index 000000000000..88a5aeb50935 > --- /dev/null > +++ b/Documentation/devicetree/bindings/interconnect/qcom-smd.txt > @@ -0,0 +1,32 @@ > +Qualcomm SMD-RPM interconnect driver binding > +------------------------------------------------ > +The RPM (Resource Power Manager) is a dedicated hardware engine > +for managing the shared SoC resources in order to keep the lowest > +power profile. It communicates with other hardware subsystems via > +the shared memory driver (SMD) back-end and accepts requests for > +various resources. > + > +Required properties : > +- compatible : shall contain only one of the following: > + "qcom,interconnect-smd-rpm" > + > +Example: > + smd { > + compatible = "qcom,smd"; > + > + rpm { > + interrupts = <0 168 1>; > + qcom,ipc = <&apcs 8 0>; > + qcom,smd-edge = <15>; > + > + rpm_requests { > + compatible = "qcom,rpm-msm8916"; > + qcom,smd-channels = "rpm_requests"; > + > + interconnect-smd-rpm { > + compatible = "qcom,interconnect-smd-rpm"; > + }; > + > + }; > + }; > + }; > diff --git a/drivers/interconnect/qcom/Kconfig b/drivers/interconnect/qcom/Kconfig > new file mode 100644 > index 000000000000..b0c2ff928d88 > --- /dev/null > +++ b/drivers/interconnect/qcom/Kconfig > @@ -0,0 +1,11 @@ > +config INTERCONNECT_QCOM > + bool "Qualcomm Network-on-Chip interconnect drivers" > + depends on INTERCONNECT > + depends on ARCH_QCOM || COMPILE_TEST > + > +config INTERCONNECT_QCOM_SMD_RPM > + tristate "Qualcomm SMD RPM interconnect driver" > + depends on INTERCONNECT_QCOM Should this also depend on CONFIG_QCOM_SMD_RPM, since it uses qcom_rpm_smd_write? > + help > + This is a driver for communicating interconnect related configuration > + details with a remote processor (RPM) on Qualcomm platforms. ... > diff --git a/drivers/interconnect/qcom/smd-rpm.h b/drivers/interconnect/qcom/smd-rpm.h > new file mode 100644 > index 000000000000..c33b91a3dd51 > --- /dev/null > +++ b/drivers/interconnect/qcom/smd-rpm.h > @@ -0,0 +1,15 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (c) 2018, Linaro Ltd. > + * Author: Georgi Djakov <georgi.djakov@linaro.org> > + */ > + > +#ifndef __DRIVERS_INTERCONNECT_QCOM_RPM_H > +#define __DRIVERS_INTERCONNECT_QCOM_RPM_H Nit: this still doesn't quite match, it would need an _SMD like: __DRIVERS_INTERCONNECT_QCOM_SMD_RPM_H > + > +#include <linux/soc/qcom/smd-rpm.h> > + > +bool qcom_icc_rpm_smd_available(void); > +int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val); > + > +#endif
diff --git a/Documentation/devicetree/bindings/interconnect/qcom-smd.txt b/Documentation/devicetree/bindings/interconnect/qcom-smd.txt new file mode 100644 index 000000000000..88a5aeb50935 --- /dev/null +++ b/Documentation/devicetree/bindings/interconnect/qcom-smd.txt @@ -0,0 +1,32 @@ +Qualcomm SMD-RPM interconnect driver binding +------------------------------------------------ +The RPM (Resource Power Manager) is a dedicated hardware engine +for managing the shared SoC resources in order to keep the lowest +power profile. It communicates with other hardware subsystems via +the shared memory driver (SMD) back-end and accepts requests for +various resources. + +Required properties : +- compatible : shall contain only one of the following: + "qcom,interconnect-smd-rpm" + +Example: + smd { + compatible = "qcom,smd"; + + rpm { + interrupts = <0 168 1>; + qcom,ipc = <&apcs 8 0>; + qcom,smd-edge = <15>; + + rpm_requests { + compatible = "qcom,rpm-msm8916"; + qcom,smd-channels = "rpm_requests"; + + interconnect-smd-rpm { + compatible = "qcom,interconnect-smd-rpm"; + }; + + }; + }; + }; diff --git a/drivers/interconnect/qcom/Kconfig b/drivers/interconnect/qcom/Kconfig new file mode 100644 index 000000000000..b0c2ff928d88 --- /dev/null +++ b/drivers/interconnect/qcom/Kconfig @@ -0,0 +1,11 @@ +config INTERCONNECT_QCOM + bool "Qualcomm Network-on-Chip interconnect drivers" + depends on INTERCONNECT + depends on ARCH_QCOM || COMPILE_TEST + +config INTERCONNECT_QCOM_SMD_RPM + tristate "Qualcomm SMD RPM interconnect driver" + depends on INTERCONNECT_QCOM + help + This is a driver for communicating interconnect related configuration + details with a remote processor (RPM) on Qualcomm platforms. diff --git a/drivers/interconnect/qcom/Makefile b/drivers/interconnect/qcom/Makefile new file mode 100644 index 000000000000..5b65e4011b59 --- /dev/null +++ b/drivers/interconnect/qcom/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_INTERCONNECT_QCOM_SMD_RPM) += smd-rpm.o diff --git a/drivers/interconnect/qcom/smd-rpm.c b/drivers/interconnect/qcom/smd-rpm.c new file mode 100644 index 000000000000..48b7a2a6eb84 --- /dev/null +++ b/drivers/interconnect/qcom/smd-rpm.c @@ -0,0 +1,91 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * RPM over SMD communication wrapper for interconnects + * + * Copyright (C) 2018 Linaro Ltd + * Author: Georgi Djakov <georgi.djakov@linaro.org> + */ + +#include <linux/interconnect-provider.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/soc/qcom/smd-rpm.h> +#include "smd-rpm.h" + +#define RPM_KEY_BW 0x00007762 + +static struct qcom_icc_rpm { + struct qcom_smd_rpm *rpm; +} icc_rpm_smd; + +struct icc_rpm_smd_req { + __le32 key; + __le32 nbytes; + __le32 value; +}; + +bool qcom_icc_rpm_smd_available(void) +{ + if (!icc_rpm_smd.rpm) + return false; + + return true; +} +EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_available); + +int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val) +{ + struct icc_rpm_smd_req req = { + .key = cpu_to_le32(RPM_KEY_BW), + .nbytes = cpu_to_le32(sizeof(u32)), + .value = cpu_to_le32(val), + }; + + return qcom_rpm_smd_write(icc_rpm_smd.rpm, ctx, rsc_type, id, &req, + sizeof(req)); +} +EXPORT_SYMBOL_GPL(qcom_icc_rpm_smd_send); + +static int qcom_icc_rpm_smd_probe(struct platform_device *pdev) +{ + icc_rpm_smd.rpm = dev_get_drvdata(pdev->dev.parent); + if (!icc_rpm_smd.rpm) { + dev_err(&pdev->dev, "unable to retrieve handle to RPM\n"); + return -ENODEV; + } + + return 0; +} + +static const struct of_device_id qcom_icc_rpm_smd_dt_match[] = { + { .compatible = "qcom,interconnect-smd-rpm", }, + { }, +}; + +MODULE_DEVICE_TABLE(of, qcom_icc_rpm_smd_dt_match); + +static struct platform_driver qcom_interconnect_rpm_smd_driver = { + .driver = { + .name = "qcom-interconnect-smd-rpm", + .of_match_table = qcom_icc_rpm_smd_dt_match, + }, + .probe = qcom_icc_rpm_smd_probe, +}; + +static int __init rpm_smd_interconnect_init(void) +{ + return platform_driver_register(&qcom_interconnect_rpm_smd_driver); +} +subsys_initcall(rpm_smd_interconnect_init); + +static void __exit rpm_smd_interconnect_exit(void) +{ + platform_driver_unregister(&qcom_interconnect_rpm_smd_driver); +} +module_exit(rpm_smd_interconnect_exit) + +MODULE_AUTHOR("Georgi Djakov <georgi.djakov@linaro.org>"); +MODULE_DESCRIPTION("Qualcomm SMD RPM interconnect driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/interconnect/qcom/smd-rpm.h b/drivers/interconnect/qcom/smd-rpm.h new file mode 100644 index 000000000000..c33b91a3dd51 --- /dev/null +++ b/drivers/interconnect/qcom/smd-rpm.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2018, Linaro Ltd. + * Author: Georgi Djakov <georgi.djakov@linaro.org> + */ + +#ifndef __DRIVERS_INTERCONNECT_QCOM_RPM_H +#define __DRIVERS_INTERCONNECT_QCOM_RPM_H + +#include <linux/soc/qcom/smd-rpm.h> + +bool qcom_icc_rpm_smd_available(void); +int qcom_icc_rpm_smd_send(int ctx, int rsc_type, int id, u32 val); + +#endif
On some Qualcomm SoCs, there is a remote processor, which controls some of the Network-On-Chip interconnect resources. Other CPUs express their needs by communicating with this processor. Add a driver to handle communication with this remote processor. Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org> --- .../bindings/interconnect/qcom-smd.txt | 32 +++++++ drivers/interconnect/qcom/Kconfig | 11 +++ drivers/interconnect/qcom/Makefile | 2 + drivers/interconnect/qcom/smd-rpm.c | 91 +++++++++++++++++++ drivers/interconnect/qcom/smd-rpm.h | 15 +++ 5 files changed, 151 insertions(+) create mode 100644 Documentation/devicetree/bindings/interconnect/qcom-smd.txt create mode 100644 drivers/interconnect/qcom/Kconfig create mode 100644 drivers/interconnect/qcom/Makefile create mode 100644 drivers/interconnect/qcom/smd-rpm.c create mode 100644 drivers/interconnect/qcom/smd-rpm.h