Implement a rather simple video interface support for OFW. This is

good enough to make the Pinebook Pro work, but probably needs a lot
more thinking.

ok kettenis@

2 files changed, 77 insertions, 2 deletions

diff --git a/sys/dev/ofw/ofw_misc.c b/sys/dev/ofw/ofw_misc.c
index e6672eb4fa9..3af8a002d8b 100644
--- a/sys/dev/ofw/ofw_misc.c
+++ b/sys/dev/ofw/ofw_misc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ofw_misc.c,v 1.12 2020/01/23 02:57:10 kettenis Exp $	*/
+/*	$OpenBSD: ofw_misc.c,v 1.13 2020/02/21 15:46:16 patrick Exp $	*/
 /*
  * Copyright (c) 2017 Mark Kettenis
  *
@@ -439,3 +439,58 @@ nvmem_read_cell(int node, const char *name, void *data, bus_size_t size)
 	nd = nc->nc_nd;
 	return nd->nd_read(nd->nd_cookie, nc->nc_addr, data, size);
 }
+
+/* Video interface support */
+
+LIST_HEAD(, video_device) video_devices =
+	LIST_HEAD_INITIALIZER(video_devices);
+
+void
+video_register(struct video_device *vd)
+{
+	vd->vd_phandle = OF_getpropint(vd->vd_node, "phandle", 0);
+	if (vd->vd_phandle == 0)
+		return;
+	LIST_INSERT_HEAD(&video_devices, vd, vd_list);
+}
+
+int
+video_port_activate(uint32_t phandle, struct drm_device *ddev)
+{
+	uint32_t ep, rep;
+	int node, error;
+
+	node = OF_getnodebyphandle(phandle);
+	if (node == 0)
+		return ENXIO;
+
+	for (node = OF_child(node); node; node = OF_peer(node)) {
+		ep = OF_getpropint(node, "phandle", 0);
+		rep = OF_getpropint(node, "remote-endpoint", 0);
+		if (ep == 0 || rep == 0)
+			continue;
+		error = video_endpoint_activate(ep, ddev);
+		if (error)
+			return error;
+		error = video_endpoint_activate(rep, ddev);
+		if (error)
+			return error;
+	}
+
+	return 0;
+}
+
+int
+video_endpoint_activate(uint32_t phandle, struct drm_device *ddev)
+{
+	struct video_device *vd;
+
+	LIST_FOREACH(vd, &video_devices, vd_list) {
+		if (vd->vd_phandle == phandle)
+			break;
+	}
+	if (vd == NULL)
+		return ENXIO;
+
+	return vd->vd_ep_activate(vd->vd_cookie, ddev);
+}
diff --git a/sys/dev/ofw/ofw_misc.h b/sys/dev/ofw/ofw_misc.h
index 53b3617851d..35a9b15c1a0 100644
--- a/sys/dev/ofw/ofw_misc.h
+++ b/sys/dev/ofw/ofw_misc.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ofw_misc.h,v 1.9 2020/01/23 02:57:10 kettenis Exp $	*/
+/*	$OpenBSD: ofw_misc.h,v 1.10 2020/02/21 15:46:16 patrick Exp $	*/
 /*
  * Copyright (c) 2017 Mark Kettenis
  *
@@ -129,4 +129,24 @@ void	nvmem_register(struct nvmem_device *);
 int	nvmem_read(uint32_t, bus_addr_t, void *, bus_size_t);
 int	nvmem_read_cell(int, const char *name, void *, bus_size_t);
 
+/* Video interface support */
+
+struct drm_device;
+struct video_device {
+	int	vd_node;
+	void	*vd_cookie;
+	int	(*vd_read)(void *, bus_addr_t, void *, bus_size_t);
+
+	int	(*vd_ep_activate)(void *, struct drm_device *);
+	void *	(*vd_ep_get_data)(void *);
+
+	LIST_ENTRY(video_device) vd_list;
+	uint32_t vd_phandle;
+};
+
+void	video_register(struct video_device *);
+int	video_port_activate(uint32_t, struct drm_device *);
+int	video_endpoint_activate(uint32_t, struct drm_device *);
+void *	video_endpoint_get_data(uint32_t);
+
 #endif /* _DEV_OFW_MISC_H_ */