drivers: qcom: rpmh: add RPMH helper functions

Sending RPMH requests and waiting for response from the controller
through a callback is common functionality across all platform drivers.
To simplify drivers, add a library functions to create RPMH client and
send resource state requests.

rpmh_write() is a synchronous blocking call that can be used to send
active state requests.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Raju P.L.S.S.S.N <rplsssn@codeaurora.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

1 files changed, 30 insertions, 1 deletions

diff --git a/drivers/soc/qcom/rpmh-internal.h b/drivers/soc/qcom/rpmh-internal.h
index cc29176f1303..1e687f719301 100644
--- a/drivers/soc/qcom/rpmh-internal.h
+++ b/drivers/soc/qcom/rpmh-internal.h
@@ -42,6 +42,32 @@ struct tcs_group {
 };
 
 /**
+ * struct rpmh_request: the message to be sent to rpmh-rsc
+ *
+ * @msg: the request
+ * @cmd: the payload that will be part of the @msg
+ * @completion: triggered when request is done
+ * @dev: the device making the request
+ * @err: err return from the controller
+ */
+struct rpmh_request {
+	struct tcs_request msg;
+	struct tcs_cmd cmd[MAX_RPMH_PAYLOAD];
+	struct completion *completion;
+	const struct device *dev;
+	int err;
+};
+
+/**
+ * struct rpmh_ctrlr: our representation of the controller
+ *
+ * @drv: the controller instance
+ */
+struct rpmh_ctrlr {
+	struct rsc_drv *drv;
+};
+
+/**
  * struct rsc_drv: the Direct Resource Voter (DRV) of the
  * Resource State Coordinator controller (RSC)
  *
@@ -52,6 +78,7 @@ struct tcs_group {
  * @tcs:        TCS groups
  * @tcs_in_use: s/w state of the TCS
  * @lock:       synchronize state of the controller
+ * @client:     handle to the DRV's client.
  */
 struct rsc_drv {
 	const char *name;
@@ -61,9 +88,11 @@ struct rsc_drv {
 	struct tcs_group tcs[TCS_TYPE_NR];
 	DECLARE_BITMAP(tcs_in_use, MAX_TCS_NR);
 	spinlock_t lock;
+	struct rpmh_ctrlr client;
 };
 
-
 int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg);
 
+void rpmh_tx_done(const struct tcs_request *msg, int r);
+
 #endif /* __RPM_INTERNAL_H__ */