linux-kernel - [PATCH v4 09/12] fpga: dfl: afu: add STP (SignalTap) support

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Date:   Sun,  4 Aug 2019 18:20:19 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     gregkh@...uxfoundation.org, mdf@...nel.org,
        linux-fpga@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-doc@...r.kernel.org, atull@...nel.org,
        Wu Hao <hao.wu@...el.com>, Xu Yilun <yilun.xu@...el.com>
Subject: [PATCH v4 09/12] fpga: dfl: afu: add STP (SignalTap) support

STP (SignalTap) is one of the private features under the port for
debugging. This patch adds private feature driver support for it
to allow userspace applications to mmap related mmio region and
provide STP service.

Signed-off-by: Xu Yilun <yilun.xu@...el.com>
Signed-off-by: Wu Hao <hao.wu@...el.com>
Acked-by: Moritz Fischer <mdf@...nel.org>
Acked-by: Alan Tull <atull@...nel.org>
Signed-off-by: Moritz Fischer <mdf@...nel.org>
---
v4: remove uinit callback which does nothing.
    remove dev_dbg in init callback function.
---
 drivers/fpga/dfl-afu-main.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/fpga/dfl-afu-main.c b/drivers/fpga/dfl-afu-main.c
index b14df11..e44e31f 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -514,6 +514,27 @@ static void port_afu_uinit(struct platform_device *pdev,
 	.uinit = port_afu_uinit,
 };
 
+static int port_stp_init(struct platform_device *pdev,
+			 struct dfl_feature *feature)
+{
+	struct resource *res = &pdev->resource[feature->resource_index];
+
+	return afu_mmio_region_add(dev_get_platdata(&pdev->dev),
+				   DFL_PORT_REGION_INDEX_STP,
+				   resource_size(res), res->start,
+				   DFL_PORT_REGION_MMAP | DFL_PORT_REGION_READ |
+				   DFL_PORT_REGION_WRITE);
+}
+
+static const struct dfl_feature_id port_stp_id_table[] = {
+	{.id = PORT_FEATURE_ID_STP,},
+	{0,}
+};
+
+static const struct dfl_feature_ops port_stp_ops = {
+	.init = port_stp_init,
+};
+
 static struct dfl_feature_driver port_feature_drvs[] = {
 	{
 		.id_table = port_hdr_id_table,
@@ -528,6 +549,10 @@ static void port_afu_uinit(struct platform_device *pdev,
 		.ops = &port_err_ops,
 	},
 	{
+		.id_table = port_stp_id_table,
+		.ops = &port_stp_ops,
+	},
+	{
 		.ops = NULL,
 	}
 };
-- 
1.8.3.1