[PATCH v3 06/10] soc: qcom: Add AOSS QMP genpd provider

Bjorn Andersson
2019-01-22T05:52:22Z

The AOSS QMP genpd provider implements control over power-related
resources related to low-power state associated with the remoteprocs in
the system as well as control over a set of clocks related to debug
hardware in the SoC.

Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---

Changes since v2:
- Add define for request array size

drivers/soc/qcom/Kconfig | 9 +++
drivers/soc/qcom/Makefile | 1 +
drivers/soc/qcom/aoss-qmp-pd.c | 138 +++++++++++++++++++++++++++++++++
3 files changed, 148 insertions(+)
create mode 100644 drivers/soc/qcom/aoss-qmp-pd.c

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index e2c859121b88..9d71e23005ad 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -12,6 +12,15 @@ config QCOM_AOSS_QMP
micro-controller in the AOSS, using QMP, to control certain resource
that are not exposed through RPMh.

+config QCOM_AOSS_QMP_PD
+ tristate "Qualcomm AOSS Messaging Power Domain driver"
+ depends on QCOM_AOSS_QMP
+ select PM_GENERIC_DOMAINS
+ help
+ This driver provides the means of controlling the AOSS's handling of
+ low-power state for resources related to the remoteproc subsystems as
+ well as controlling the debug clocks.
+
config QCOM_COMMAND_DB
bool "Qualcomm Command DB"
depends on ARCH_QCOM || COMPILE_TEST
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 2c04d27fbf9e..16913e73fddf 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
CFLAGS_rpmh-rsc.o := -I$(src)
obj-$(CONFIG_QCOM_AOSS_QMP) += aoss-qmp.o
+obj-$(CONFIG_QCOM_AOSS_QMP_PD) += aoss-qmp-pd.o
obj-$(CONFIG_QCOM_GENI_SE) += qcom-geni-se.o
obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
obj-$(CONFIG_QCOM_GLINK_SSR) += glink_ssr.o
diff --git a/drivers/soc/qcom/aoss-qmp-pd.c b/drivers/soc/qcom/aoss-qmp-pd.c
new file mode 100644
index 000000000000..82dd569a2bc9
--- /dev/null
+++ b/drivers/soc/qcom/aoss-qmp-pd.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, Linaro Ltd
+ */
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_domain.h>
+#include <linux/soc/qcom/aoss-qmp.h>
+#include <dt-bindings/power/qcom-aoss-qmp.h>
+
+/* Requests are expected to be 96 bytes long */
+#define AOSS_QMP_PD_MSG_LEN 96
+
+struct qmp_pd {
+ struct qmp *qmp;
+
+ struct generic_pm_domain pd;
+
+ const char *name;
+};
+
+#define to_qmp_pd_resource(res) container_of(res, struct qmp_pd, pd)
+
+struct qmp_pd_resource {
+ const char *name;
+ int (*on)(struct generic_pm_domain *domain);
+ int (*off)(struct generic_pm_domain *domain);
+};
+
+static int qmp_pd_clock_toggle(struct qmp_pd *res, bool enable)
+{
+ char buf[AOSS_QMP_PD_MSG_LEN];
+
+ snprintf(buf, sizeof(buf), "{class: clock, res: %s, val: %d}",
+ res->name, !!enable);
+ return qmp_send(res->qmp, buf, sizeof(buf));
+}
+
+static int qmp_pd_clock_on(struct generic_pm_domain *domain)
+{
+ return qmp_pd_clock_toggle(to_qmp_pd_resource(domain), true);
+}
+
+static int qmp_pd_clock_off(struct generic_pm_domain *domain)
+{
+ return qmp_pd_clock_toggle(to_qmp_pd_resource(domain), false);
+}
+
+static int qmp_pd_image_toggle(struct qmp_pd *res, bool enable)
+{
+ char buf[AOSS_QMP_PD_MSG_LEN];
+
+ snprintf(buf, sizeof(buf),
+ "{class: image, res: load_state, name: %s, val: %s}",
+ res->name, enable ? "on" : "off");
+ return qmp_send(res->qmp, buf, sizeof(buf));
+}
+
+static int qmp_pd_image_on(struct generic_pm_domain *domain)
+{
+ return qmp_pd_image_toggle(to_qmp_pd_resource(domain), true);
+}
+
+static int qmp_pd_image_off(struct generic_pm_domain *domain)
+{
+ return qmp_pd_image_toggle(to_qmp_pd_resource(domain), false);
+}
+
+static const struct qmp_pd_resource sdm845_resources[] = {
+ [AOSS_QMP_QDSS_CLK] = { "qdss", qmp_pd_clock_on, qmp_pd_clock_off },
+ [AOSS_QMP_LS_CDSP] = { "cdsp", qmp_pd_image_on, qmp_pd_image_off },
+ [AOSS_QMP_LS_LPASS] = { "adsp", qmp_pd_image_on, qmp_pd_image_off },
+ [AOSS_QMP_LS_MODEM] = { "modem", qmp_pd_image_on, qmp_pd_image_off },
+ [AOSS_QMP_LS_SLPI] = { "slpi", qmp_pd_image_on, qmp_pd_image_off },
+ [AOSS_QMP_LS_SPSS] = { "spss", qmp_pd_image_on, qmp_pd_image_off },
+ [AOSS_QMP_LS_VENUS] = { "venus", qmp_pd_image_on, qmp_pd_image_off },
+};
+
+static int qmp_pd_probe(struct platform_device *pdev)
+{
+ struct genpd_onecell_data *data;
+ struct device *parent = pdev->dev.parent;
+ struct qmp_pd *res;
+ struct qmp *qmp;
+ size_t num = ARRAY_SIZE(sdm845_resources);
+ int i;
+
+ qmp = dev_get_drvdata(pdev->dev.parent);
+ if (!qmp)
+ return -EINVAL;
+
+ res = devm_kcalloc(&pdev->dev, num, sizeof(*res), GFP_KERNEL);
+ if (!res)
+ return -ENOMEM;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->domains = devm_kcalloc(&pdev->dev, num, sizeof(*data->domains),
+ GFP_KERNEL);
+
+ for (i = 0; i < num; i++) {
+ pm_genpd_init(&res[i].pd, NULL, true);
+ res[i].qmp = qmp;
+ res[i].name = sdm845_resources[i].name;
+
+ res[i].pd.name = sdm845_resources[i].name;
+ res[i].pd.power_on = sdm845_resources[i].on;
+ res[i].pd.power_off = sdm845_resources[i].off;
+
+ data->domains[data->num_domains++] = &res[i].pd;
+ }
+
+ return of_genpd_add_provider_onecell(parent->of_node, data);
+}
+
+static int qmp_pd_remove(struct platform_device *pdev)
+{
+ struct device *parent = pdev->dev.parent;
+
+ of_genpd_del_provider(parent->of_node);
+
+ return 0;
+}
+
+static struct platform_driver qmp_pd_driver = {
+ .driver = {
+ .name = "aoss_qmp_pd",
+ },
+ .probe = qmp_pd_probe,
+ .remove = qmp_pd_remove,
+};
+module_platform_driver(qmp_pd_driver);
+
+MODULE_ALIAS("platform:aoss_qmp_pd");
+MODULE_DESCRIPTION("Qualcomm AOSS QMP load-state driver");
+MODULE_LICENSE("GPL v2");
--
2.18.0