linux-kernel - [PATCH v21 3/5] firmware: xilinx: Add RPU configuration APIs

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Message-ID: <20201102193859.31090-4-ben.levinsky@xilinx.com>
Date:   Mon, 2 Nov 2020 11:38:57 -0800
From:   Ben Levinsky <ben.levinsky@...inx.com>
To:     <michael.auchter@...com>, <stefanos@...inx.com>,
        <mathieu.poirier@...aro.org>
CC:     <devicetree@...r.kernel.org>, <linux-remoteproc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v21 3/5] firmware: xilinx: Add RPU configuration APIs

This patch adds APIs to access to configure RPU and its
processor-specific memory.

That is query the run-time mode of RPU as either split or lockstep as well
as API to set this mode. In addition add APIs to access configuration of
the RPUs' tightly coupled memory (TCM).

Signed-off-by: Ben Levinsky <ben.levinsky@...inx.com>
---
 drivers/firmware/xilinx/zynqmp.c     | 61 ++++++++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h | 18 ++++++++
 2 files changed, 79 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index a966ee956573..b390a00338d0 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -846,6 +846,67 @@ int zynqmp_pm_release_node(const u32 node)
 }
 EXPORT_SYMBOL_GPL(zynqmp_pm_release_node);
 
+/**
+ * zynqmp_pm_get_rpu_mode() - Get RPU mode
+ * @node_id:	Node ID of the device
+ * @rpu_mode:	return by reference value
+ *		either split or lockstep
+ *
+ * Return:	return 0 on success or error+reason.
+ *		if success, then  rpu_mode will be set
+ *		to current rpu mode.
+ */
+int zynqmp_pm_get_rpu_mode(u32 node_id, enum rpu_oper_mode *rpu_mode)
+{
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	int ret;
+
+	ret = zynqmp_pm_invoke_fn(PM_IOCTL, node_id,
+				  IOCTL_GET_RPU_OPER_MODE, 0, 0, ret_payload);
+
+	/* only set rpu_mode if no error */
+	if (ret == XST_PM_SUCCESS)
+		*rpu_mode = ret_payload[0];
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_get_rpu_mode);
+
+/**
+ * zynqmp_pm_set_rpu_mode() - Set RPU mode
+ * @node_id:	Node ID of the device
+ * @rpu_mode:	Argument 1 to requested IOCTL call. either split or lockstep
+ *
+ *		This function is used to set RPU mode to split or
+ *		lockstep
+ *
+ * Return:	Returns status, either success or error+reason
+ */
+int zynqmp_pm_set_rpu_mode(u32 node_id, enum rpu_oper_mode rpu_mode)
+{
+	return zynqmp_pm_invoke_fn(PM_IOCTL, node_id,
+				   IOCTL_SET_RPU_OPER_MODE, (u32)rpu_mode,
+				   0, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_set_rpu_mode);
+
+/**
+ * zynqmp_pm_set_tcm_config - configure TCM
+ * @tcm_mode:	Argument 1 to requested IOCTL call
+ *              either PM_RPU_TCM_COMB or PM_RPU_TCM_SPLIT
+ *
+ * This function is used to set RPU mode to split or combined
+ *
+ * Return: status: 0 for success, else failure
+ */
+int zynqmp_pm_set_tcm_config(u32 node_id, enum rpu_tcm_comb tcm_mode)
+{
+	return zynqmp_pm_invoke_fn(PM_IOCTL, node_id,
+				   IOCTL_TCM_COMB_CONFIG, (u32)tcm_mode, 0,
+				   NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_set_tcm_config);
+
 /**
  * zynqmp_pm_force_pwrdwn - PM call to request for another PU or subsystem to
  *             be powered down forcefully
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 6241c5ac51b3..79aa2fcbcd54 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -385,6 +385,9 @@ int zynqmp_pm_request_wake(const u32 node,
 			   const bool set_addr,
 			   const u64 address,
 			   const enum zynqmp_pm_request_ack ack);
+int zynqmp_pm_get_rpu_mode(u32 node_id, enum rpu_oper_mode *rpu_mode);
+int zynqmp_pm_set_rpu_mode(u32 node_id, u32 arg1);
+int zynqmp_pm_set_tcm_config(u32 node_id, u32 arg1);
 #else
 static inline struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void)
 {
@@ -549,6 +552,21 @@ static inline int zynqmp_pm_request_wake(const u32 node,
 {
 	return -ENODEV;
 }
+
+static inline int zynqmp_pm_get_rpu_mode(u32 node_id, enum rpu_oper_mode *rpu_mode)
+{
+	return -ENODEV;
+}
+
+static inline int zynqmp_pm_set_rpu_mode(u32 node_id, u32 arg1)
+{
+	return -ENODEV;
+}
+
+static inline int zynqmp_pm_set_tcm_config(u32 node_id, u32 arg1)
+{
+	return -ENODEV;
+}
 #endif
 
 #endif /* __FIRMWARE_ZYNQMP_H__ */
-- 
2.17.1