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coresight: platform: Refactor graph endpoint parsing
Refactor the of graph endpoint parsing code, to make the error handling easier. Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 83 additions and 55 deletions
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@ -114,17 +114,70 @@ int of_coresight_get_cpu(const struct device_node *node)
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}
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EXPORT_SYMBOL_GPL(of_coresight_get_cpu);
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/*
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* of_coresight_parse_endpoint : Parse the given output endpoint @ep
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* and fill the connection information in @pdata[@i].
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*
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* Parses the local port, remote device name and the remote port.
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*
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* Returns :
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* 1 - If the parsing is successful and a connection record
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* was created for an output connection.
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* 0 - If the parsing completed without any fatal errors.
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* -Errno - Fatal error, abort the scanning.
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*/
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static int of_coresight_parse_endpoint(struct device *dev,
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struct device_node *ep,
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struct coresight_platform_data *pdata,
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int i)
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{
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int ret = 0;
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struct of_endpoint endpoint, rendpoint;
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struct device_node *rparent = NULL;
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struct device_node *rport = NULL;
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struct device *rdev = NULL;
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do {
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/* Parse the local port details */
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if (of_graph_parse_endpoint(ep, &endpoint))
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break;
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/*
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* Get a handle on the remote port and parent
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* attached to it.
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*/
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rparent = of_graph_get_remote_port_parent(ep);
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if (!rparent)
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break;
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rport = of_graph_get_remote_port(ep);
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if (!rport)
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break;
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if (of_graph_parse_endpoint(rport, &rendpoint))
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break;
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/* If the remote device is not available, defer probing */
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rdev = of_coresight_get_endpoint_device(rparent);
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if (!rdev) {
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ret = -EPROBE_DEFER;
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break;
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}
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pdata->outports[i] = endpoint.port;
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pdata->child_names[i] = dev_name(rdev);
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pdata->child_ports[i] = rendpoint.id;
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/* Connection record updated */
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ret = 1;
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} while (0);
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return ret;
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}
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struct coresight_platform_data *
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of_get_coresight_platform_data(struct device *dev,
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const struct device_node *node)
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{
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int i = 0, ret = 0;
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struct coresight_platform_data *pdata;
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struct of_endpoint endpoint, rendpoint;
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struct device *rdev;
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struct device_node *ep = NULL;
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struct device_node *rparent = NULL;
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struct device_node *rport = NULL;
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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@ -132,64 +185,39 @@ of_get_coresight_platform_data(struct device *dev,
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/* Use device name as sysfs handle */
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pdata->name = dev_name(dev);
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pdata->cpu = of_coresight_get_cpu(node);
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/* Get the number of input and output port for this component */
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of_coresight_get_ports(node, &pdata->nr_inport, &pdata->nr_outport);
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if (pdata->nr_outport) {
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ret = of_coresight_alloc_memory(dev, pdata);
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if (ret)
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/* If there are no output connections, we are done */
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if (!pdata->nr_outport)
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return pdata;
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ret = of_coresight_alloc_memory(dev, pdata);
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if (ret)
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return ERR_PTR(ret);
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/* Iterate through each port to discover topology */
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while ((ep = of_graph_get_next_endpoint(node, ep))) {
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/*
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* No need to deal with input ports, as processing the
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* output ports connected to them will process the details.
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*/
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if (of_find_property(ep, "slave-mode", NULL))
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continue;
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ret = of_coresight_parse_endpoint(dev, ep, pdata, i);
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switch (ret) {
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case 1:
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i++; /* Fall through */
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case 0:
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break;
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default:
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return ERR_PTR(ret);
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/* Iterate through each port to discover topology */
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do {
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/* Get a handle on a port */
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ep = of_graph_get_next_endpoint(node, ep);
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if (!ep)
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break;
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/*
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* No need to deal with input ports, processing for as
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* processing for output ports will deal with them.
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*/
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if (of_find_property(ep, "slave-mode", NULL))
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continue;
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/* Get a handle on the local endpoint */
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ret = of_graph_parse_endpoint(ep, &endpoint);
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if (ret)
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continue;
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/* The local out port number */
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pdata->outports[i] = endpoint.port;
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/*
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* Get a handle on the remote port and parent
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* attached to it.
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*/
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rparent = of_graph_get_remote_port_parent(ep);
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rport = of_graph_get_remote_port(ep);
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if (!rparent || !rport)
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continue;
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if (of_graph_parse_endpoint(rport, &rendpoint))
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continue;
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rdev = of_coresight_get_endpoint_device(rparent);
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if (!rdev)
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return ERR_PTR(-EPROBE_DEFER);
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pdata->child_names[i] = dev_name(rdev);
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pdata->child_ports[i] = rendpoint.id;
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i++;
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} while (ep);
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}
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}
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pdata->cpu = of_coresight_get_cpu(node);
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return pdata;
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}
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EXPORT_SYMBOL_GPL(of_get_coresight_platform_data);
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