linux-kernel - [PATCH 3/3] fpga: zynqmp-fpga: Adds status interface

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Message-ID: <20220524094745.287002-4-nava.manne@xilinx.com>
Date:   Tue, 24 May 2022 15:17:45 +0530
From:   Nava kishore Manne <nava.manne@...inx.com>
To:     <michal.simek@...inx.com>, <mdf@...nel.org>, <hao.wu@...el.com>,
        <yilun.xu@...el.com>, <trix@...hat.com>,
        <gregkh@...uxfoundation.org>, <ronak.jain@...inx.com>,
        <abhyuday.godhasara@...inx.com>, <rajan.vaja@...inx.com>,
        <nava.manne@...inx.com>, <lakshmi.sai.krishna.potthuri@...inx.com>,
        <piyush.mehta@...inx.com>, <harsha.harsha@...inx.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-fpga@...r.kernel.org>,
        <git@...inx.com>
Subject: [PATCH 3/3] fpga: zynqmp-fpga: Adds status interface

Adds status interface for zynqmp-fpga, It's a read only
interface which allows the user to get the PL status.

Usage:
To read the PL configuration status
        cat /sys/class/fpga_manager/<fpga>/status

Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
---
 drivers/fpga/zynqmp-fpga.c | 52 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/fpga/zynqmp-fpga.c b/drivers/fpga/zynqmp-fpga.c
index c60f20949c47..07c7b7326726 100644
--- a/drivers/fpga/zynqmp-fpga.c
+++ b/drivers/fpga/zynqmp-fpga.c
@@ -14,6 +14,19 @@
 
 /* Constant Definitions */
 #define IXR_FPGA_DONE_MASK	BIT(3)
+#define READ_DMA_SIZE		256U
+
+/* Error Register */
+#define IXR_FPGA_ERR_CRC_ERR		BIT(0)
+#define IXR_FPGA_ERR_SECURITY_ERR	BIT(16)
+
+/* Signal Status Register. For details refer ug570 */
+#define IXR_FPGA_END_OF_STARTUP		BIT(4)
+#define IXR_FPGA_GST_CFG_B		BIT(5)
+#define IXR_FPGA_INIT_B_INTERNAL	BIT(11)
+#define IXR_FPGA_DONE_INTERNAL_SIGNAL	BIT(13)
+
+#define IXR_FPGA_CONFIG_STAT_OFFSET	7U
 
 /**
  * struct zynqmp_fpga_priv - Private data structure
@@ -77,8 +90,47 @@ static enum fpga_mgr_states zynqmp_fpga_ops_state(struct fpga_manager *mgr)
 	return FPGA_MGR_STATE_UNKNOWN;
 }
 
+static u64 zynqmp_fpga_ops_status(struct fpga_manager *mgr)
+{
+	unsigned int *buf, reg_val;
+	dma_addr_t dma_addr;
+	u64 status = 0;
+	int ret;
+
+	buf = dma_alloc_coherent(mgr->dev.parent, READ_DMA_SIZE,
+				 &dma_addr, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	ret = zynqmp_pm_fpga_read(IXR_FPGA_CONFIG_STAT_OFFSET, dma_addr,
+				  PM_FPGA_READ_CONFIG_REG, &reg_val);
+	if (ret) {
+		status = FPGA_MGR_STATUS_FIRMWARE_REQ_ERR;
+		goto free_dmabuf;
+	}
+
+	if (reg_val & IXR_FPGA_ERR_CRC_ERR)
+		status |= FPGA_MGR_STATUS_CRC_ERR;
+	if (reg_val & IXR_FPGA_ERR_SECURITY_ERR)
+		status |= FPGA_MGR_STATUS_SECURITY_ERR;
+	if (!(reg_val & IXR_FPGA_INIT_B_INTERNAL))
+		status |= FPGA_MGR_STATUS_DEVICE_INIT_ERR;
+	if (!(reg_val & IXR_FPGA_DONE_INTERNAL_SIGNAL))
+		status |= FPGA_MGR_STATUS_SIGNAL_ERR;
+	if (!(reg_val & IXR_FPGA_GST_CFG_B))
+		status |= FPGA_MGR_STATUS_HIGH_Z_STATE_ERR;
+	if (!(reg_val & IXR_FPGA_END_OF_STARTUP))
+		status |= FPGA_MGR_STATUS_EOS_ERR;
+
+free_dmabuf:
+	dma_free_coherent(mgr->dev.parent, READ_DMA_SIZE, buf, dma_addr);
+
+	return status;
+}
+
 static const struct fpga_manager_ops zynqmp_fpga_ops = {
 	.state = zynqmp_fpga_ops_state,
+	.status = zynqmp_fpga_ops_status,
 	.write_init = zynqmp_fpga_ops_write_init,
 	.write = zynqmp_fpga_ops_write,
 };
-- 
2.25.1