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From:   Nava kishore Manne <nava.manne@xilinx.com>
To:     <robh+dt@kernel.org>, <michal.simek@xilinx.com>,
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Subject: [PATCH 3/5] firmware: xilinx: Add afi ioctl support
Date:   Tue, 20 Apr 2021 13:41:51 +0530
Message-ID: <20210420081153.17020-4-nava.manne@xilinx.com>
In-Reply-To: <20210420081153.17020-1-nava.manne@xilinx.com>
References: <20210420081153.17020-1-nava.manne@xilinx.com>
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This patch adds afi ioctl to support dynamic PS-PL
bus width settings.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
---
 drivers/firmware/xilinx/zynqmp.c     | 13 +++++++++++++
 include/linux/firmware/xlnx-zynqmp.h |  7 +++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 7eb9958662dd..ada9eb9e26e3 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -713,6 +713,19 @@ int zynqmp_pm_read_pggs(u32 index, u32 *value)
 }
 EXPORT_SYMBOL_GPL(zynqmp_pm_read_pggs);
 
+/**
+ * zynqmp_pm_afi()  - PM API for setting the PS-PL bus width
+ * @index:	Register index value
+ * @value:	value to be written into the register
+ *
+ * Return:      Returns status, either success or error+reason
+ */
+int zynqmp_pm_afi(u32 index, u32 value)
+{
+	return zynqmp_pm_invoke_fn(PM_IOCTL, 0, IOCTL_AFI, index, value, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_afi);
+
 /**
  * zynqmp_pm_set_boot_health_status() - PM API for setting healthy boot status
  * @value:	Status value to be written
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 71177b17eee5..792fb4f5d86f 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -113,6 +113,7 @@ enum pm_ioctl_id {
 	IOCTL_READ_PGGS = 15,
 	/* Set healthy bit value */
 	IOCTL_SET_BOOT_HEALTH_STATUS = 17,
+	IOCTL_AFI = 18,
 };
 
 enum pm_query_id {
@@ -353,6 +354,7 @@ int zynqmp_pm_write_pggs(u32 index, u32 value);
 int zynqmp_pm_read_pggs(u32 index, u32 *value);
 int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype);
 int zynqmp_pm_set_boot_health_status(u32 value);
+int zynqmp_pm_afi(u32 index, u32 value);
 #else
 static inline struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void)
 {
@@ -537,6 +539,11 @@ static inline int zynqmp_pm_set_boot_health_status(u32 value)
 {
 	return -ENODEV;
 }
+
+static inline int zynqmp_pm_afi(u32 index, u32 value)
+{
+	return -ENODEV;
+}
 #endif
 
 #endif /* __FIRMWARE_ZYNQMP_H__ */
-- 
2.18.0