linux-kernel - [PATCH 2/5] firmware: xilinx: Add shutdown/wakeup APIs

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Date:   Mon, 24 Feb 2020 09:52:28 -0800
From:   Ben Levinsky <ben.levinsky@...inx.com>
To:     ohad@...ery.com, bjorn.andersson@...aro.org,
        michal.simek@...inx.com, jollys@...inx.com, rajan.vaja@...inx.com,
        robh+dt@...nel.org, mark.rutland@....com
Cc:     linux-remoteproc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] firmware: xilinx: Add shutdown/wakeup APIs

Add shutdown/wakeup a resource eemi operations to shutdown
or bringup a resource.

Signed-off-by: Ben Levinsky <ben.levinsky@...inx.com>
---
 drivers/firmware/xilinx/zynqmp.c     | 35 +++++++++++++++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h |  8 ++++++++
 2 files changed, 43 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 20e4574..486dcb1 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -692,6 +692,39 @@ static int zynqmp_pm_release_node(const u32 node)
 }
 
 /**
+ * zynqmp_pm_force_powerdown - PM call to request for another PU or subsystem to
+ *             be powered down forcefully
+ * @target:    Node ID of the targeted PU or subsystem
+ * @ack:   Flag to specify whether acknowledge is requested
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_force_powerdown(const u32 target,
+				   const enum zynqmp_pm_request_ack ack)
+{
+	return zynqmp_pm_invoke_fn(PM_FORCE_POWERDOWN, target, ack, 0, 0, NULL);
+}
+
+/**
+ * zynqmp_pm_request_wakeup - PM call to wake up selected master or subsystem
+ * @node:  Node ID of the master or subsystem
+ * @set_addr:  Specifies whether the address argument is relevant
+ * @address:   Address from which to resume when woken up
+ * @ack:   Flag to specify whether acknowledge requested
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_request_wakeup(const u32 node,
+				   const bool set_addr,
+				   const u64 address,
+				   const enum zynqmp_pm_request_ack ack)
+{
+	/* set_addr flag is encoded into 1st bit of address */
+	return zynqmp_pm_invoke_fn(PM_REQUEST_WAKEUP, node, address | set_addr,
+					address >> 32, ack, 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
@@ -731,6 +764,8 @@ static const struct zynqmp_eemi_ops eemi_ops = {
 	.set_suspend_mode = zynqmp_pm_set_suspend_mode,
 	.request_node = zynqmp_pm_request_node,
 	.release_node = zynqmp_pm_release_node,
+	.force_powerdown = zynqmp_pm_force_powerdown,
+	.request_wakeup = zynqmp_pm_request_wakeup,
 	.set_requirement = zynqmp_pm_set_requirement,
 	.fpga_load = zynqmp_pm_fpga_load,
 	.fpga_get_status = zynqmp_pm_fpga_get_status,
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index b8ca118..0a68849 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -82,6 +82,8 @@ enum pm_api_id {
 	PM_CLOCK_GETRATE,
 	PM_CLOCK_SETPARENT,
 	PM_CLOCK_GETPARENT,
+	PM_FORCE_POWERDOWN = 8,
+	PM_REQUEST_WAKEUP = 10,
 	PM_FEATURE_CHECK = 63,
 	PM_API_MAX,
 };
@@ -330,6 +332,12 @@ struct zynqmp_eemi_ops {
 			    const u32 qos,
 			    const enum zynqmp_pm_request_ack ack);
 	int (*release_node)(const u32 node);
+	int (*force_powerdown)(const u32 target,
+				const enum zynqmp_pm_request_ack ack);
+	int (*request_wakeup)(const u32 node,
+				const bool set_addr,
+				const u64 address,
+				const enum zynqmp_pm_request_ack ack);
 	int (*set_requirement)(const u32 node,
 			       const u32 capabilities,
 			       const u32 qos,
-- 
2.7.4