From bd127b8191cf22adac9dedeca4f38093d61ff1ca Mon Sep 17 00:00:00 2001
From: Wu Hao <hao.wu@intel.com>
Date: Mon, 12 Aug 2019 10:50:02 +0800
Subject: [PATCH] fpga: dfl: afu: add STP (SignalTap) support
Git-commit: bd127b8191cf22adac9dedeca4f38093d61ff1ca
References: jsc#SLE-13441
Patch-mainline: v5.4-rc1

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@intel.com>
Signed-off-by: Wu Hao <hao.wu@intel.com>
Acked-by: Moritz Fischer <mdf@kernel.org>
Acked-by: Alan Tull <atull@kernel.org>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
 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 e11352af1324..e4a34dc7947f 100644
--- a/drivers/fpga/dfl-afu-main.c
+++ b/drivers/fpga/dfl-afu-main.c
@@ -508,6 +508,27 @@ static const struct dfl_feature_ops port_afu_ops = {
 	.init = port_afu_init,
 };
 
+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,
@@ -521,6 +542,10 @@ static struct dfl_feature_driver port_feature_drvs[] = {
 		.id_table = port_err_id_table,
 		.ops = &port_err_ops,
 	},
+	{
+		.id_table = port_stp_id_table,
+		.ops = &port_stp_ops,
+	},
 	{
 		.ops = NULL,
 	}
-- 
2.26.2