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Subject[PATCH v3 2/4] firmware: xilinx: Add APIs to control node status/power
Date
From: Rajan Vaja <rajan.vaja@xilinx.com>

Add Xilinx ZynqMP firmware APIs to control node status
and power. These APIs allows turning on/off power domain
and setting capabilities of devices present in power domain.

Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>
---
drivers/firmware/xilinx/zynqmp.c | 58 ++++++++++++++++++++++++++++++++++++
include/linux/firmware/xlnx-zynqmp.h | 26 ++++++++++++++++
2 files changed, 84 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 9a1c72a..faf6a52 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -469,6 +469,61 @@ static int zynqmp_pm_ioctl(u32 node_id, u32 ioctl_id, u32 arg1, u32 arg2,
arg1, arg2, out);
}

+/**
+ * zynqmp_pm_request_node() - Request a node with specific capabilities
+ * @node: Node ID of the slave
+ * @capabilities: Requested capabilities of the slave
+ * @qos: Quality of service (not supported)
+ * @ack: Flag to specify whether acknowledge is requested
+ *
+ * This function is used by master to request particular node from firmware.
+ * Every master must request node before using it.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_request_node(const u32 node, const u32 capabilities,
+ const u32 qos,
+ const enum zynqmp_pm_request_ack ack)
+{
+ return zynqmp_pm_invoke_fn(PM_REQUEST_NODE, node, capabilities,
+ qos, ack, NULL);
+}
+
+/**
+ * zynqmp_pm_release_node() - Release a node
+ * @node: Node ID of the slave
+ *
+ * This function is used by master to inform firmware that master
+ * has released node. Once released, master must not use that node
+ * without re-request.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_release_node(const u32 node)
+{
+ return zynqmp_pm_invoke_fn(PM_RELEASE_NODE, node, 0, 0, 0, NULL);
+}
+
+/**
+ * zynqmp_pm_set_requirement() - PM call to set requirement for PM slaves
+ * @node: Node ID of the slave
+ * @capabilities: Requested capabilities of the slave
+ * @qos: Quality of service (not supported)
+ * @ack: Flag to specify whether acknowledge is requested
+ *
+ * This API function is to be used for slaves a PU already has requested
+ * to change its capabilities.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_set_requirement(const u32 node, const u32 capabilities,
+ const u32 qos,
+ const enum zynqmp_pm_request_ack ack)
+{
+ return zynqmp_pm_invoke_fn(PM_SET_REQUIREMENT, node, capabilities,
+ qos, ack, NULL);
+}
+
static const struct zynqmp_eemi_ops eemi_ops = {
.get_api_version = zynqmp_pm_get_api_version,
.query_data = zynqmp_pm_query_data,
@@ -482,6 +537,9 @@ static const struct zynqmp_eemi_ops eemi_ops = {
.clock_setparent = zynqmp_pm_clock_setparent,
.clock_getparent = zynqmp_pm_clock_getparent,
.ioctl = zynqmp_pm_ioctl,
+ .request_node = zynqmp_pm_request_node,
+ .release_node = zynqmp_pm_release_node,
+ .set_requirement = zynqmp_pm_set_requirement,
};

/**
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 3c3c28e..6998f7d 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -32,8 +32,19 @@
/* Number of 32bits values in payload */
#define PAYLOAD_ARG_CNT 4U

+#define ZYNQMP_PM_MAX_QOS 100U
+
+/* Node capabilities */
+#define ZYNQMP_PM_CAPABILITY_ACCESS 0x1U
+#define ZYNQMP_PM_CAPABILITY_CONTEXT 0x2U
+#define ZYNQMP_PM_CAPABILITY_WAKEUP 0x4U
+#define ZYNQMP_PM_CAPABILITY_POWER 0x8U
+
enum pm_api_id {
PM_GET_API_VERSION = 1,
+ PM_REQUEST_NODE = 13,
+ PM_RELEASE_NODE,
+ PM_SET_REQUIREMENT,
PM_IOCTL = 34,
PM_QUERY_DATA,
PM_CLOCK_ENABLE,
@@ -75,6 +86,12 @@ enum pm_query_id {
PM_QID_CLOCK_GET_NUM_CLOCKS = 12,
};

+enum zynqmp_pm_request_ack {
+ ZYNQMP_PM_REQUEST_ACK_NO = 1,
+ ZYNQMP_PM_REQUEST_ACK_BLOCKING,
+ ZYNQMP_PM_REQUEST_ACK_NON_BLOCKING,
+};
+
/**
* struct zynqmp_pm_query_data - PM query data
* @qid: query ID
@@ -102,6 +119,15 @@ struct zynqmp_eemi_ops {
int (*clock_setparent)(u32 clock_id, u32 parent_id);
int (*clock_getparent)(u32 clock_id, u32 *parent_id);
int (*ioctl)(u32 node_id, u32 ioctl_id, u32 arg1, u32 arg2, u32 *out);
+ int (*request_node)(const u32 node,
+ const u32 capabilities,
+ const u32 qos,
+ const enum zynqmp_pm_request_ack ack);
+ int (*release_node)(const u32 node);
+ int (*set_requirement)(const u32 node,
+ const u32 capabilities,
+ const u32 qos,
+ const enum zynqmp_pm_request_ack ack);
};

#if IS_REACHABLE(CONFIG_ARCH_ZYNQMP)
--
2.7.4
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