@@ -20,12 +20,174 @@
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/slab.h>
#include <media/v4l2-async.h>
#include <media/v4l2-fwnode.h>
#include "rcar-vin.h"
+/* -----------------------------------------------------------------------------
+ * Gen3 CSI2 Group Allocator
+ */
+
+/* FIXME: This should if we find a system that supports more
+ * than one group for the whole system be replaced with a linked
+ * list of groups. And eventually all of this should be replaced
+ * with a global device allocator API.
+ *
+ * But for now this works as on all supported systems there will
+ * be only one group for all instances.
+ */
+
+static DEFINE_MUTEX(rvin_group_lock);
+static struct rvin_group *rvin_group_data;
+
+static void rvin_group_cleanup(struct rvin_group *group)
+{
+ media_device_unregister(&group->mdev);
+ media_device_cleanup(&group->mdev);
+ mutex_destroy(&group->lock);
+}
+
+static int rvin_group_init(struct rvin_group *group, struct rvin_dev *vin)
+{
+ struct media_device *mdev = &group->mdev;
+ const struct of_device_id *match;
+ struct device_node *np;
+ int ret;
+
+ mutex_init(&group->lock);
+
+ /* Count number of VINs in the system */
+ group->count = 0;
+ for_each_matching_node(np, vin->dev->driver->of_match_table)
+ if (of_device_is_available(np))
+ group->count++;
+
+ vin_dbg(vin, "found %u enabled VIN's in DT", group->count);
+
+ mdev->dev = vin->dev;
+
+ match = of_match_node(vin->dev->driver->of_match_table,
+ vin->dev->of_node);
+
+ strlcpy(mdev->driver_name, KBUILD_MODNAME, sizeof(mdev->driver_name));
+ strlcpy(mdev->model, match->compatible, sizeof(mdev->model));
+ snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
+ dev_name(mdev->dev));
+
+ media_device_init(mdev);
+
+ ret = media_device_register(&group->mdev);
+ if (ret)
+ rvin_group_cleanup(group);
+
+ return ret;
+}
+
+static void rvin_group_release(struct kref *kref)
+{
+ struct rvin_group *group =
+ container_of(kref, struct rvin_group, refcount);
+
+ mutex_lock(&rvin_group_lock);
+
+ rvin_group_data = NULL;
+
+ rvin_group_cleanup(group);
+
+ kfree(group);
+
+ mutex_unlock(&rvin_group_lock);
+}
+
+static int rvin_group_get(struct rvin_dev *vin)
+{
+ struct rvin_group *group;
+ u32 id;
+ int ret;
+
+ /* Make sure VIN id is present and sane */
+ ret = of_property_read_u32(vin->dev->of_node, "renesas,id", &id);
+ if (ret) {
+ vin_err(vin, "%pOF: No renesas,id property found\n",
+ vin->dev->of_node);
+ return -EINVAL;
+ }
+
+ if (id >= RCAR_VIN_NUM) {
+ vin_err(vin, "%pOF: Invalid renesas,id '%u'\n",
+ vin->dev->of_node, id);
+ return -EINVAL;
+ }
+
+ /* Join or create a VIN group */
+ mutex_lock(&rvin_group_lock);
+ if (rvin_group_data) {
+ group = rvin_group_data;
+ kref_get(&group->refcount);
+ } else {
+ group = kzalloc(sizeof(*group), GFP_KERNEL);
+ if (!group) {
+ ret = -ENOMEM;
+ goto err_group;
+ }
+
+ ret = rvin_group_init(group, vin);
+ if (ret) {
+ kfree(group);
+ vin_err(vin, "Failed to initialize group\n");
+ goto err_group;
+ }
+
+ kref_init(&group->refcount);
+
+ rvin_group_data = group;
+ }
+ mutex_unlock(&rvin_group_lock);
+
+ /* Add VIN to group */
+ mutex_lock(&group->lock);
+
+ if (group->vin[id]) {
+ vin_err(vin, "Duplicate renesas,id property value %u\n", id);
+ mutex_unlock(&group->lock);
+ kref_put(&group->refcount, rvin_group_release);
+ return -EINVAL;
+ }
+
+ group->vin[id] = vin;
+
+ vin->id = id;
+ vin->group = group;
+ vin->v4l2_dev.mdev = &group->mdev;
+
+ mutex_unlock(&group->lock);
+
+ return 0;
+err_group:
+ mutex_unlock(&rvin_group_lock);
+ return ret;
+}
+
+static void rvin_group_put(struct rvin_dev *vin)
+{
+ mutex_lock(&vin->group->lock);
+
+ vin->group = NULL;
+ vin->v4l2_dev.mdev = NULL;
+
+ if (WARN_ON(vin->group->vin[vin->id] != vin))
+ goto out;
+
+ vin->group->vin[vin->id] = NULL;
+out:
+ mutex_unlock(&vin->group->lock);
+
+ kref_put(&vin->group->refcount, rvin_group_release);
+}
+
/* -----------------------------------------------------------------------------
* Async notifier
*/
@@ -249,12 +411,18 @@ static int rvin_digital_graph_init(struct rvin_dev *vin)
static int rvin_mc_init(struct rvin_dev *vin)
{
+ int ret;
+
/* All our sources are CSI-2 */
vin->mbus_cfg.type = V4L2_MBUS_CSI2;
vin->mbus_cfg.flags = 0;
vin->pad.flags = MEDIA_PAD_FL_SINK;
- return media_entity_pads_init(&vin->vdev.entity, 1, &vin->pad);
+ ret = media_entity_pads_init(&vin->vdev.entity, 1, &vin->pad);
+ if (ret)
+ return ret;
+
+ return rvin_group_get(vin);
}
/* -----------------------------------------------------------------------------
@@ -374,7 +542,9 @@ static int rcar_vin_remove(struct platform_device *pdev)
v4l2_async_notifier_unregister(&vin->notifier);
v4l2_async_notifier_cleanup(&vin->notifier);
- if (!vin->info->use_mc)
+ if (vin->info->use_mc)
+ rvin_group_put(vin);
+ else
v4l2_ctrl_handler_free(&vin->ctrl_handler);
rvin_dma_unregister(vin);
@@ -17,6 +17,8 @@
#ifndef __RCAR_VIN__
#define __RCAR_VIN__
+#include <linux/kref.h>
+
#include <media/v4l2-async.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-dev.h>
@@ -29,6 +31,11 @@
/* Address alignment mask for HW buffers */
#define HW_BUFFER_MASK 0x7f
+/* Max number on VIN instances that can be in a system */
+#define RCAR_VIN_NUM 8
+
+struct rvin_group;
+
enum model_id {
RCAR_H1,
RCAR_M1,
@@ -99,6 +106,8 @@ struct rvin_info {
* @notifier: V4L2 asynchronous subdevs notifier
* @digital: entity in the DT for local digital subdevice
*
+ * @group: Gen3 CSI group
+ * @id: Gen3 group id for this VIN
* @pad: media pad for the video device entity
*
* @lock: protects @queue
@@ -133,6 +142,8 @@ struct rvin_dev {
struct v4l2_async_notifier notifier;
struct rvin_graph_entity *digital;
+ struct rvin_group *group;
+ unsigned int id;
struct media_pad pad;
struct mutex lock;
@@ -164,6 +175,26 @@ struct rvin_dev {
#define vin_warn(d, fmt, arg...) dev_warn(d->dev, fmt, ##arg)
#define vin_err(d, fmt, arg...) dev_err(d->dev, fmt, ##arg)
+/**
+ * struct rvin_group - VIN CSI2 group information
+ * @refcount: number of VIN instances using the group
+ *
+ * @mdev: media device which represents the group
+ *
+ * @lock: protects the count and vin members
+ * @count: number of enabled VIN instances found in DT
+ * @vin: VIN instances which are part of the group
+ */
+struct rvin_group {
+ struct kref refcount;
+
+ struct media_device mdev;
+
+ struct mutex lock;
+ unsigned int count;
+ struct rvin_dev *vin[RCAR_VIN_NUM];
+};
+
int rvin_dma_register(struct rvin_dev *vin, int irq);
void rvin_dma_unregister(struct rvin_dev *vin);