/*
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* Media driver for Freescale i.MX5/6 SOC
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*
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* Open Firmware parsing.
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*
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* Copyright (c) 2016 Mentor Graphics Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/of_platform.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-fwnode.h>
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#include <media/v4l2-subdev.h>
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#include <media/videobuf2-dma-contig.h>
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#include <linux/of_graph.h>
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#include <video/imx-ipu-v3.h>
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#include "imx-media.h"
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static int of_get_port_count(const struct device_node *np)
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{
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struct device_node *ports, *child;
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int num = 0;
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/* check if this node has a ports subnode */
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ports = of_get_child_by_name(np, "ports");
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if (ports)
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np = ports;
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for_each_child_of_node(np, child)
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if (of_node_cmp(child->name, "port") == 0)
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num++;
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of_node_put(ports);
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return num;
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}
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/*
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* find the remote device node given local endpoint node
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*/
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static bool of_get_remote(struct device_node *epnode,
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struct device_node **remote_node)
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{
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struct device_node *rp, *rpp;
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struct device_node *remote;
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bool is_csi_port;
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rp = of_graph_get_remote_port(epnode);
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rpp = of_graph_get_remote_port_parent(epnode);
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if (of_device_is_compatible(rpp, "fsl,imx6q-ipu")) {
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/* the remote is one of the CSI ports */
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remote = rp;
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of_node_put(rpp);
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is_csi_port = true;
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} else {
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remote = rpp;
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of_node_put(rp);
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is_csi_port = false;
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}
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if (!of_device_is_available(remote)) {
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of_node_put(remote);
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*remote_node = NULL;
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} else {
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*remote_node = remote;
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}
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return is_csi_port;
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}
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static int
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of_parse_subdev(struct imx_media_dev *imxmd, struct device_node *sd_np,
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bool is_csi_port)
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{
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int i, num_ports, ret;
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if (!of_device_is_available(sd_np)) {
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dev_dbg(imxmd->md.dev, "%s: %s not enabled\n", __func__,
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sd_np->name);
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/* unavailable is not an error */
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return 0;
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}
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/* register this subdev with async notifier */
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ret = imx_media_add_async_subdev(imxmd, of_fwnode_handle(sd_np),
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NULL);
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if (ret) {
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if (ret == -EEXIST) {
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/* already added, everything is fine */
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return 0;
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}
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/* other error, can't continue */
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return ret;
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}
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/*
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* the ipu-csi has one sink port. The source pads are not
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* represented in the device tree by port nodes, but are
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* described by the internal pads and links later.
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*/
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num_ports = is_csi_port ? 1 : of_get_port_count(sd_np);
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for (i = 0; i < num_ports; i++) {
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struct device_node *epnode = NULL, *port, *remote_np;
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port = is_csi_port ? sd_np : of_graph_get_port_by_id(sd_np, i);
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if (!port)
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continue;
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for_each_child_of_node(port, epnode) {
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bool remote_is_csi;
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remote_is_csi = of_get_remote(epnode, &remote_np);
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if (!remote_np)
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continue;
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ret = of_parse_subdev(imxmd, remote_np, remote_is_csi);
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of_node_put(remote_np);
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if (ret)
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break;
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}
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if (port != sd_np)
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of_node_put(port);
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if (ret) {
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of_node_put(epnode);
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break;
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}
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}
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return ret;
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}
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int imx_media_add_of_subdevs(struct imx_media_dev *imxmd,
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struct device_node *np)
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{
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struct device_node *csi_np;
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int i, ret;
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for (i = 0; ; i++) {
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csi_np = of_parse_phandle(np, "ports", i);
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if (!csi_np)
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break;
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ret = of_parse_subdev(imxmd, csi_np, true);
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of_node_put(csi_np);
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if (ret)
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return ret;
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}
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return 0;
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}
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/*
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* Create a single media link to/from sd using a fwnode link.
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*
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* NOTE: this function assumes an OF port node is equivalent to
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* a media pad (port id equal to media pad index), and that an
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* OF endpoint node is equivalent to a media link.
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*/
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static int create_of_link(struct imx_media_dev *imxmd,
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struct v4l2_subdev *sd,
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struct v4l2_fwnode_link *link)
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{
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struct v4l2_subdev *remote, *src, *sink;
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int src_pad, sink_pad;
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if (link->local_port >= sd->entity.num_pads)
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return -EINVAL;
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remote = imx_media_find_subdev_by_fwnode(imxmd, link->remote_node);
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if (!remote)
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return 0;
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if (sd->entity.pads[link->local_port].flags & MEDIA_PAD_FL_SINK) {
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src = remote;
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src_pad = link->remote_port;
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sink = sd;
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sink_pad = link->local_port;
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} else {
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src = sd;
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src_pad = link->local_port;
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sink = remote;
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sink_pad = link->remote_port;
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}
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/* make sure link doesn't already exist before creating */
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if (media_entity_find_link(&src->entity.pads[src_pad],
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&sink->entity.pads[sink_pad]))
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return 0;
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v4l2_info(sd->v4l2_dev, "%s:%d -> %s:%d\n",
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src->name, src_pad, sink->name, sink_pad);
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return media_create_pad_link(&src->entity, src_pad,
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&sink->entity, sink_pad, 0);
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}
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/*
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* Create media links to/from sd using its device-tree endpoints.
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*/
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int imx_media_create_of_links(struct imx_media_dev *imxmd,
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struct v4l2_subdev *sd)
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{
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struct v4l2_fwnode_link link;
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struct device_node *ep;
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int ret;
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for_each_endpoint_of_node(sd->dev->of_node, ep) {
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ret = v4l2_fwnode_parse_link(of_fwnode_handle(ep), &link);
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if (ret)
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continue;
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ret = create_of_link(imxmd, sd, &link);
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v4l2_fwnode_put_link(&link);
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if (ret)
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return ret;
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}
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return 0;
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}
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/*
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* Create media links to the given CSI subdevice's sink pads,
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* using its device-tree endpoints.
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*/
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int imx_media_create_csi_of_links(struct imx_media_dev *imxmd,
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struct v4l2_subdev *csi)
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{
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struct device_node *csi_np = csi->dev->of_node;
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struct device_node *ep;
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for_each_child_of_node(csi_np, ep) {
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struct fwnode_handle *fwnode, *csi_ep;
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struct v4l2_fwnode_link link;
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int ret;
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memset(&link, 0, sizeof(link));
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link.local_node = of_fwnode_handle(csi_np);
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link.local_port = CSI_SINK_PAD;
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csi_ep = of_fwnode_handle(ep);
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fwnode = fwnode_graph_get_remote_endpoint(csi_ep);
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if (!fwnode)
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continue;
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fwnode = fwnode_get_parent(fwnode);
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fwnode_property_read_u32(fwnode, "reg", &link.remote_port);
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fwnode = fwnode_get_next_parent(fwnode);
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if (is_of_node(fwnode) &&
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of_node_cmp(to_of_node(fwnode)->name, "ports") == 0)
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fwnode = fwnode_get_next_parent(fwnode);
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link.remote_node = fwnode;
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ret = create_of_link(imxmd, csi, &link);
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fwnode_handle_put(link.remote_node);
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if (ret)
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return ret;
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}
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return 0;
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}
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