From: Georgi Djakov <georgi.djakov@linaro.org>
To: linux-pm@vger.kernel.org, gregkh@linuxfoundation.org
Cc: rjw@rjwysocki.net, robh+dt@kernel.org, mturquette@baylibre.com,
khilman@baylibre.com, vincent.guittot@linaro.org,
skannan@codeaurora.org, bjorn.andersson@linaro.org,
amit.kucheria@linaro.org, seansw@qti.qualcomm.com,
daidavid1@codeaurora.org, evgreen@chromium.org,
mark.rutland@arm.com, lorenzo.pieralisi@arm.com,
abailon@baylibre.com, arnd@arndb.de, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org, georgi.djakov@linaro.org
Subject: [PATCH v8 5/8] interconnect: qcom: Add RPM communication
Date: Fri, 10 Aug 2018 17:52:30 +0300 [thread overview]
Message-ID: <20180810145233.16466-6-georgi.djakov@linaro.org> (raw)
In-Reply-To: <20180810145233.16466-1-georgi.djakov@linaro.org>
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>
Reviewed-by: Evan Green <evgreen@chromium.org>
---
.../bindings/interconnect/qcom-smd.txt | 32 +++++++
drivers/interconnect/qcom/Kconfig | 14 +++
drivers/interconnect/qcom/Makefile | 2 +
drivers/interconnect/qcom/smd-rpm.c | 91 +++++++++++++++++++
drivers/interconnect/qcom/smd-rpm.h | 16 ++++
5 files changed, 155 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..2325167f6eaf
--- /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 = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>;
+ 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..812e9464765a
--- /dev/null
+++ b/drivers/interconnect/qcom/Kconfig
@@ -0,0 +1,14 @@
+config INTERCONNECT_QCOM
+ bool "Qualcomm Network-on-Chip interconnect drivers"
+ depends on INTERCONNECT
+ depends on ARCH_QCOM || COMPILE_TEST
+ help
+ Support for Qualcomm's Network-on-Chip interconnect hardware.
+
+config INTERCONNECT_QCOM_SMD_RPM
+ tristate "Qualcomm SMD RPM interconnect driver"
+ depends on INTERCONNECT_QCOM
+ depends on QCOM_SMD_RPM
+ 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..3b1c347475ff
--- /dev/null
+++ b/drivers/interconnect/qcom/smd-rpm.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2018, Linaro Ltd.
+ * Author: Georgi Djakov <georgi.djakov@linaro.org>
+ */
+
+#ifndef __DRIVERS_INTERCONNECT_QCOM_SMD_RPM_H
+#define __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
next prev parent reply other threads:[~2018-08-10 14:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-10 14:52 [PATCH v8 0/8] Introduce on-chip interconnect API Georgi Djakov
2018-08-10 14:52 ` [PATCH v8 1/8] interconnect: Add generic " Georgi Djakov
2018-08-10 14:52 ` [PATCH v8 2/8] dt-bindings: Introduce interconnect binding Georgi Djakov
2018-08-10 14:52 ` [PATCH v8 3/8] interconnect: Allow endpoints translation via DT Georgi Djakov
2018-08-10 14:52 ` [PATCH v8 4/8] interconnect: Add debugfs support Georgi Djakov
2018-08-10 14:52 ` Georgi Djakov [this message]
2018-08-10 14:52 ` [PATCH v8 6/8] dt-bindings: interconnect: Document qcom,msm8916 NoC bindings Georgi Djakov
2018-08-10 14:52 ` [PATCH v8 7/8] interconnect: qcom: Add msm8916 interconnect provider driver Georgi Djakov
2018-08-10 14:52 ` [PATCH v8 8/8] MAINTAINERS: add a maintainer for the interconnect API Georgi Djakov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180810145233.16466-6-georgi.djakov@linaro.org \
--to=georgi.djakov@linaro.org \
--cc=abailon@baylibre.com \
--cc=amit.kucheria@linaro.org \
--cc=arnd@arndb.de \
--cc=bjorn.andersson@linaro.org \
--cc=daidavid1@codeaurora.org \
--cc=devicetree@vger.kernel.org \
--cc=evgreen@chromium.org \
--cc=gregkh@linuxfoundation.org \
--cc=khilman@baylibre.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=mark.rutland@arm.com \
--cc=mturquette@baylibre.com \
--cc=rjw@rjwysocki.net \
--cc=robh+dt@kernel.org \
--cc=seansw@qti.qualcomm.com \
--cc=skannan@codeaurora.org \
--cc=vincent.guittot@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).