fpga: dfl: export fme and port error DFH revision to sysfs

With Intel OFS, the definition of the port error bits have
changed to reflect the transition from CCI-P to AXI-S TLP.
Export the DFH revision to sysfs so that user space can
properly decode the port errors.

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>

Author: matthew-gerlach

drivers/fpga/dfl-afu-error.c

@@ -178,10 +178,24 @@ static ssize_t first_malformed_req_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(first_malformed_req);
 
+static ssize_t revision_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	void __iomem *base;
+	u64 dfh;
+
+	base = dfl_get_feature_ioaddr_by_id(dev, PORT_FEATURE_ID_ERROR);
+
+	dfh = readq(base);
+
+	return sprintf(buf, "%lld\n", FIELD_GET(DFH_REVISION, dfh));
+}
+static DEVICE_ATTR_RO(revision);
+
 static struct attribute *port_err_attrs[] = {
 	&dev_attr_errors.attr,
 	&dev_attr_first_error.attr,
 	&dev_attr_first_malformed_req.attr,
+	&dev_attr_revision.attr,
 	NULL,
 };
 

drivers/fpga/dfl-fme-error.c

@@ -279,6 +279,19 @@ static ssize_t next_error_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(next_error);
 
+static ssize_t revision_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	void __iomem *base;
+	u64 dfh;
+
+	base = dfl_get_feature_ioaddr_by_id(dev, FME_FEATURE_ID_GLOBAL_ERR);
+
+	dfh = readq(base);
+
+	return sprintf(buf, "%lld\n", FIELD_GET(DFH_REVISION, dfh));
+}
+static DEVICE_ATTR_RO(revision);
+
 static struct attribute *fme_global_err_attrs[] = {
 	&dev_attr_pcie0_errors.attr,
 	&dev_attr_pcie1_errors.attr,
@@ -288,6 +301,7 @@ static struct attribute *fme_global_err_attrs[] = {
 	&dev_attr_fme_errors.attr,
 	&dev_attr_first_error.attr,
 	&dev_attr_next_error.attr,
+	&dev_attr_revision.attr,
 	NULL,
 };