linux-kernel - [PATCH v7 1/2] firmware: xilinx: Add pm api function for PL config reg readback

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Date:   Fri, 24 Feb 2023 17:37:37 +0530
From:   Nava kishore Manne <nava.kishore.manne@....com>
To:     <michal.simek@...inx.com>, <mdf@...nel.org>, <hao.wu@...el.com>,
        <yilun.xu@...el.com>, <trix@...hat.com>,
        <nava.kishore.manne@....com>, <ronak.jain@...inx.com>,
        <gregkh@...uxfoundation.org>, <tanmay.shah@...inx.com>,
        <mathieu.poirier@...aro.org>, <ben.levinsky@....com>,
        <rajan.vaja@...inx.com>, <harsha.harsha@...inx.com>,
        <arnd@...db.de>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-fpga@...r.kernel.org>
Subject: [PATCH v7 1/2] firmware: xilinx: Add pm api function for PL config reg readback

Adds PM API for performing Programmable Logic(PL) configuration
register readback. It provides an interface to the firmware(pmufw)
to readback the FPGA configuration register.

Signed-off-by: Nava kishore Manne <nava.kishore.manne@....com>
---
changes for v2:
              - None.

Changes for v3:
              - Updated API and config reg read-back handling logic
              - Updated the commit msg to align with the changes.

Changes for v4:
              - Fixed some minor coding issues. No functional changes.
              - Updated Return value comments as suggested by Xu Yilun.

Changes for v5:
              - Fixed some minor coding issues as suggested by Xu Yilun.
                No functional changes.

Changes for v6:
              - None.

Changes for v7:
              - None.

 drivers/firmware/xilinx/zynqmp.c     | 33 ++++++++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h | 11 ++++++++++
 2 files changed, 44 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 129f68d7a6f5..3d8cc6795b43 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -948,6 +948,39 @@ int zynqmp_pm_fpga_get_status(u32 *value)
 }
 EXPORT_SYMBOL_GPL(zynqmp_pm_fpga_get_status);
 
+/**
+ * zynqmp_pm_fpga_get_config_status - Get the FPGA configuration status.
+ * @value: Buffer to store FPGA configuration status.
+ *
+ * This function provides access to the pmufw to get the FPGA configuration
+ * status
+ *
+ * Return: 0 on success, a negative value on error
+ */
+int zynqmp_pm_fpga_get_config_status(u32 *value)
+{
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+	u32 buf, lower_addr, upper_addr;
+	int ret;
+
+	if (!value)
+		return -EINVAL;
+
+	lower_addr = lower_32_bits((u64)&buf);
+	upper_addr = upper_32_bits((u64)&buf);
+
+	ret = zynqmp_pm_invoke_fn(PM_FPGA_READ,
+				  XILINX_ZYNQMP_PM_FPGA_CONFIG_STAT_OFFSET,
+				  lower_addr, upper_addr,
+				  XILINX_ZYNQMP_PM_FPGA_READ_CONFIG_REG,
+				  ret_payload);
+
+	*value = ret_payload[1];
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_fpga_get_config_status);
+
 /**
  * zynqmp_pm_pinctrl_request - Request Pin from firmware
  * @pin: Pin number to request
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index b09f443d3ab9..ce37d55ffa44 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -71,6 +71,10 @@
 #define XILINX_ZYNQMP_PM_FPGA_FULL	0x0U
 #define XILINX_ZYNQMP_PM_FPGA_PARTIAL	BIT(0)
 
+/* FPGA Status Reg */
+#define XILINX_ZYNQMP_PM_FPGA_CONFIG_STAT_OFFSET	7U
+#define XILINX_ZYNQMP_PM_FPGA_READ_CONFIG_REG		0U
+
 /*
  * Node IDs for the Error Events.
  */
@@ -120,6 +124,7 @@ enum pm_api_id {
 	PM_CLOCK_GETRATE = 42,
 	PM_CLOCK_SETPARENT = 43,
 	PM_CLOCK_GETPARENT = 44,
+	PM_FPGA_READ = 46,
 	PM_SECURE_AES = 47,
 	PM_FEATURE_CHECK = 63,
 };
@@ -515,6 +520,7 @@ int zynqmp_pm_aes_engine(const u64 address, u32 *out);
 int zynqmp_pm_sha_hash(const u64 address, const u32 size, const u32 flags);
 int zynqmp_pm_fpga_load(const u64 address, const u32 size, const u32 flags);
 int zynqmp_pm_fpga_get_status(u32 *value);
+int zynqmp_pm_fpga_get_config_status(u32 *value);
 int zynqmp_pm_write_ggs(u32 index, u32 value);
 int zynqmp_pm_read_ggs(u32 index, u32 *value);
 int zynqmp_pm_write_pggs(u32 index, u32 value);
@@ -721,6 +727,11 @@ static inline int zynqmp_pm_fpga_get_status(u32 *value)
 	return -ENODEV;
 }
 
+static inline int zynqmp_pm_fpga_get_config_status(u32 *value)
+{
+	return -ENODEV;
+}
+
 static inline int zynqmp_pm_write_ggs(u32 index, u32 value)
 {
 	return -ENODEV;
-- 
2.25.1