linux-kernel - [PATCH 09/16] fpga: intel: fme: add header sub feature support

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Date:   Thu, 30 Mar 2017 20:08:09 +0800
From:   Wu Hao <hao.wu@...el.com>
To:     atull@...nel.org, moritz.fischer@...us.com,
        linux-fpga@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     luwei.kang@...el.com, yi.z.zhang@...el.com, hao.wu@...el.com,
        Tim Whisonant <tim.whisonant@...el.com>,
        Enno Luebbers <enno.luebbers@...el.com>,
        Shiva Rao <shiva.rao@...el.com>,
        Christopher Rauer <christopher.rauer@...el.com>,
        Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Subject: [PATCH 09/16] fpga: intel: fme: add header sub feature support

From: Kang Luwei <luwei.kang@...el.com>

The header register set is always present for FPGA Management Engine (FME),
this patch implements init and uinit function for header sub feature and
introduce several read-only sysfs interfaces for the capability and status.

Sysfs interfaces:
* /sys/class/fpga/<fpga.x>/<intel-fpga-fme.x>/ports_num
  Read-only. Number of ports implemented

* /sys/class/fpga/<fpga.x>/<intel-fpga-fme.x>/bitstream_id
  Read-only. Blue Bitstream identifier number

* /sys/class/fpga/<fpga.x>/<intel-fpga-fme.x>/bitstream_metadata
  Read-only. Blue Bitstream meta data

Signed-off-by: Tim Whisonant <tim.whisonant@...el.com>
Signed-off-by: Enno Luebbers <enno.luebbers@...el.com>
Signed-off-by: Shiva Rao <shiva.rao@...el.com>
Signed-off-by: Christopher Rauer <christopher.rauer@...el.com>
Signed-off-by: Kang Luwei <luwei.kang@...el.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@...ux.intel.com>
Signed-off-by: Wu Hao <hao.wu@...el.com>
---
 drivers/fpga/intel/feature-dev.h |  3 +++
 drivers/fpga/intel/fme-main.c    | 55 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 58 insertions(+)

diff --git a/drivers/fpga/intel/feature-dev.h b/drivers/fpga/intel/feature-dev.h
index 9d39b94..dccc283 100644
--- a/drivers/fpga/intel/feature-dev.h
+++ b/drivers/fpga/intel/feature-dev.h
@@ -124,6 +124,9 @@ struct feature_fme_header {
 	u64 rsvd[2];
 	struct feature_fme_capability capability;
 	struct feature_fme_port port[MAX_FPGA_PORT_NUM];
+	u64 rsvd1;
+	u64 bitstream_id;
+	u64 bitstream_md;
 };
 
 /* FME Thermal Sub Feature Register Set */
diff --git a/drivers/fpga/intel/fme-main.c b/drivers/fpga/intel/fme-main.c
index c603268..a7c69fc 100644
--- a/drivers/fpga/intel/fme-main.c
+++ b/drivers/fpga/intel/fme-main.c
@@ -23,15 +23,70 @@
 
 #include "feature-dev.h"
 
+static ssize_t ports_num_show(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct feature_fme_header *fme_hdr
+		= get_feature_ioaddr_by_index(dev, FME_FEATURE_ID_HEADER);
+	struct feature_fme_capability fme_capability;
+
+	fme_capability.csr = readq(&fme_hdr->capability);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", fme_capability.num_ports);
+}
+static DEVICE_ATTR_RO(ports_num);
+
+static ssize_t bitstream_id_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct feature_fme_header *fme_hdr
+		= get_feature_ioaddr_by_index(dev, FME_FEATURE_ID_HEADER);
+	u64 bitstream_id = readq(&fme_hdr->bitstream_id);
+
+	return scnprintf(buf, PAGE_SIZE, "0x%llx\n",
+				(unsigned long long)bitstream_id);
+}
+static DEVICE_ATTR_RO(bitstream_id);
+
+static ssize_t bitstream_metadata_show(struct device *dev,
+				       struct device_attribute *attr, char *buf)
+{
+	struct feature_fme_header *fme_hdr
+		= get_feature_ioaddr_by_index(dev, FME_FEATURE_ID_HEADER);
+	u64 bitstream_md = readq(&fme_hdr->bitstream_md);
+
+	return scnprintf(buf, PAGE_SIZE, "0x%llx\n",
+				(unsigned long long)bitstream_md);
+}
+static DEVICE_ATTR_RO(bitstream_metadata);
+
+static const struct attribute *fme_hdr_attrs[] = {
+	&dev_attr_ports_num.attr,
+	&dev_attr_bitstream_id.attr,
+	&dev_attr_bitstream_metadata.attr,
+	NULL,
+};
+
 static int fme_hdr_init(struct platform_device *pdev, struct feature *feature)
 {
+	struct feature_fme_header *fme_hdr = feature->ioaddr;
+	int ret;
+
 	dev_dbg(&pdev->dev, "FME HDR Init.\n");
+	dev_dbg(&pdev->dev, "FME cap %llx.\n",
+				(unsigned long long)fme_hdr->capability.csr);
+
+	ret = sysfs_create_files(&pdev->dev.kobj, fme_hdr_attrs);
+	if (ret)
+		return ret;
+
 	return 0;
 }
 
 static void fme_hdr_uinit(struct platform_device *pdev, struct feature *feature)
 {
 	dev_dbg(&pdev->dev, "FME HDR UInit.\n");
+	sysfs_remove_files(&pdev->dev.kobj, fme_hdr_attrs);
 }
 
 struct feature_ops fme_hdr_ops = {
-- 
2.7.4