linux-kernel - [PATCH v2 8/9] firmware: xilinx: Add IOCTL support for AIE ISR Clear

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Date:   Wed, 18 Nov 2020 15:48:08 -0800
From:   Wendy Liang <wendy.liang@...inx.com>
To:     <robh+dt@...nel.org>, <michal.simek@...inx.com>, <arnd@...db.de>,
        <gregkh@...uxfoundation.org>, <sumit.semwal@...aro.org>,
        <christian.koenig@....com>, <derek.kiernan@...inx.com>,
        <dragan.cvetic@...inx.com>, <rajan.vaja@...inx.com>,
        <tejas.patel@...inx.com>, <manish.narani@...inx.com>,
        <ravi.patel@...inx.com>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>,
        Izhar Ameer Shaikh <izhar.ameer.shaikh@...inx.com>,
        Wendy Liang <wendy.liang@...inx.com>
Subject: [PATCH v2 8/9] firmware: xilinx: Add IOCTL support for AIE ISR Clear

From: Izhar Ameer Shaikh <izhar.ameer.shaikh@...inx.com>

Latching of AIE NPI Interrupts is present in Versal ES1 Silicon Rev,
however it has been removed from ES2 rev.
As a result on ES1, in order to use the interrupt, a client needs to
request PMC to clear/ack the interrupt.

Provide an EEMI IOCTL to serve the same purpose. Note that, this will
only be applicable for ES1 rev. For ES2 and other non-silicon platforms,
this call will essentially be a NOP in the firmware.

Signed-off-by: Izhar Ameer Shaikh <izhar.ameer.shaikh@...inx.com>
Signed-off-by: Wendy Liang <wendy.liang@...inx.com>
---
 drivers/firmware/xilinx/zynqmp.c     | 14 ++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h |  8 ++++++++
 2 files changed, 22 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index efb8a66..7a0c6a3 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -702,6 +702,20 @@ int zynqmp_pm_set_boot_health_status(u32 value)
 }
 
 /**
+ * zynqmp_pm_clear_aie_npi_isr - Clear AI engine NPI interrupt status register
+ * @node:	AI engine node id
+ * @irq_mask:	Mask of AI engine NPI interrupt bit to clear
+ *
+ * Return: Returns status, either success or error+reason
+ */
+int zynqmp_pm_clear_aie_npi_isr(u32 node, u32 irq_mask)
+{
+	return zynqmp_pm_invoke_fn(PM_IOCTL, node, IOCTL_AIE_ISR_CLEAR,
+				   irq_mask, 0, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_clear_aie_npi_isr);
+
+/**
  * zynqmp_pm_reset_assert - Request setting of reset (1 - assert, 0 - release)
  * @reset:		Reset to be configured
  * @assert_flag:	Flag stating should reset be asserted (1) or
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 7b6f9fc..cdc0867 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -120,6 +120,8 @@ enum pm_ioctl_id {
 	IOCTL_READ_PGGS = 15,
 	/* Set healthy bit value */
 	IOCTL_SET_BOOT_HEALTH_STATUS = 17,
+	/* AI engine NPI ISR clear */
+	IOCTL_AIE_ISR_CLEAR = 24,
 };
 
 enum pm_query_id {
@@ -361,6 +363,7 @@ 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_clear_aie_npi_isr(u32 node, u32 irq_mask);
 #else
 static inline struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void)
 {
@@ -511,6 +514,11 @@ static inline int zynqmp_pm_set_boot_health_status(u32 value)
 {
 	return -ENODEV;
 }
+
+static inline int zynqmp_pm_clear_aie_npi_isr(u32 node, u32 irq_mask)
+{
+	return -ENODEV;
+}
 #endif
 
 #endif /* __FIRMWARE_ZYNQMP_H__ */
-- 
2.7.4