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Subject[PATCH 3/5] firmware: xilinx: Add zynqmp_get_node_status API
Date
This patch adds a new API to provide access to the
current power state of a sub-system on Zynqmp sub-system.

Signed-off-by: Ben Levinsky <ben.levinsky@xilinx.com>
---
drivers/firmware/xilinx/zynqmp.c | 42 ++++++++++++++++++++++++++++++++++++
include/linux/firmware/xlnx-zynqmp.h | 3 +++
2 files changed, 45 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 486dcb1..98e35d4 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -725,6 +725,47 @@ static int zynqmp_pm_request_wakeup(const u32 node,
}

/**
+ * zynqmp_pm_get_node_status - PM call to request a node's current power state
+ * @node: ID of the component or sub-system in question
+ * @status: Current operating state of the requested node
+ * @requirements: Current requirements asserted on the node,
+ * used for slave nodes only.
+ * @usage: Usage information, used for slave nodes only:
+ * PM_USAGE_NO_MASTER - No master is currently using
+ * the node
+ * PM_USAGE_CURRENT_MASTER - Only requesting master is
+ * currently using the node
+ * PM_USAGE_OTHER_MASTER - Only other masters are
+ * currently using the node
+ * PM_USAGE_BOTH_MASTERS - Both the current and at least
+ * one other master is currently
+ * using the node
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_get_node_status(const u32 node, u32 *const status,
+ u32 *const requirements, u32 *const usage)
+{
+ u32 ret_payload[PAYLOAD_ARG_CNT];
+ int ret;
+
+ if (!status)
+ return -EINVAL;
+
+ ret = zynqmp_pm_invoke_fn(PM_GET_NODE_STATUS, node, 0, 0,
+ 0, ret_payload);
+ if (ret_payload[0] == XST_PM_SUCCESS) {
+ *status = ret_payload[1];
+ if (requirements)
+ *requirements = ret_payload[2];
+ if (usage)
+ *usage = ret_payload[3];
+ }
+
+ return ret;
+}
+
+/**
* zynqmp_pm_set_requirement() - PM call to set requirement for PM slaves
* @node: Node ID of the slave
* @capabilities: Requested capabilities of the slave
@@ -769,6 +810,7 @@ static const struct zynqmp_eemi_ops eemi_ops = {
.set_requirement = zynqmp_pm_set_requirement,
.fpga_load = zynqmp_pm_fpga_load,
.fpga_get_status = zynqmp_pm_fpga_get_status,
+ .get_node_status = zynqmp_pm_get_node_status,
};

/**
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 0a68849..fb4efc9 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -62,6 +62,7 @@

enum pm_api_id {
PM_GET_API_VERSION = 1,
+ PM_GET_NODE_STATUS = 3,
PM_REQUEST_NODE = 13,
PM_RELEASE_NODE,
PM_SET_REQUIREMENT,
@@ -309,6 +310,8 @@ struct zynqmp_pm_query_data {
struct zynqmp_eemi_ops {
int (*get_api_version)(u32 *version);
int (*get_chipid)(u32 *idcode, u32 *version);
+ int (*get_node_status)(const u32 node, u32 *const status,
+ u32 *const requirements, u32 *const usage);
int (*fpga_load)(const u64 address, const u32 size, const u32 flags);
int (*fpga_get_status)(u32 *value);
int (*query_data)(struct zynqmp_pm_query_data qdata, u32 *out);
--
2.7.4
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