gpu: host1x: Add channel support
Add support for host1x client modules, and host1x channels to submit
work to the clients.
Signed-off-by: Arto Merilainen <amerilainen@nvidia.com>
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
Tested-by: Erik Faye-Lund <kusmabite@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
diff --git a/drivers/gpu/host1x/channel.c b/drivers/gpu/host1x/channel.c
new file mode 100644
index 0000000..83ea51b
--- /dev/null
+++ b/drivers/gpu/host1x/channel.c
@@ -0,0 +1,126 @@
+/*
+ * Tegra host1x Channel
+ *
+ * Copyright (c) 2010-2013, NVIDIA Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#include "channel.h"
+#include "dev.h"
+#include "job.h"
+
+/* Constructor for the host1x device list */
+int host1x_channel_list_init(struct host1x *host)
+{
+ INIT_LIST_HEAD(&host->chlist.list);
+ mutex_init(&host->chlist_mutex);
+
+ if (host->info->nb_channels > BITS_PER_LONG) {
+ WARN(1, "host1x hardware has more channels than supported by the driver\n");
+ return -ENOSYS;
+ }
+
+ return 0;
+}
+
+int host1x_job_submit(struct host1x_job *job)
+{
+ struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
+
+ return host1x_hw_channel_submit(host, job);
+}
+
+struct host1x_channel *host1x_channel_get(struct host1x_channel *channel)
+{
+ int err = 0;
+
+ mutex_lock(&channel->reflock);
+
+ if (channel->refcount == 0)
+ err = host1x_cdma_init(&channel->cdma);
+
+ if (!err)
+ channel->refcount++;
+
+ mutex_unlock(&channel->reflock);
+
+ return err ? NULL : channel;
+}
+
+void host1x_channel_put(struct host1x_channel *channel)
+{
+ mutex_lock(&channel->reflock);
+
+ if (channel->refcount == 1) {
+ struct host1x *host = dev_get_drvdata(channel->dev->parent);
+
+ host1x_hw_cdma_stop(host, &channel->cdma);
+ host1x_cdma_deinit(&channel->cdma);
+ }
+
+ channel->refcount--;
+
+ mutex_unlock(&channel->reflock);
+}
+
+struct host1x_channel *host1x_channel_request(struct device *dev)
+{
+ struct host1x *host = dev_get_drvdata(dev->parent);
+ int max_channels = host->info->nb_channels;
+ struct host1x_channel *channel = NULL;
+ int index, err;
+
+ mutex_lock(&host->chlist_mutex);
+
+ index = find_first_zero_bit(&host->allocated_channels, max_channels);
+ if (index >= max_channels)
+ goto fail;
+
+ channel = kzalloc(sizeof(*channel), GFP_KERNEL);
+ if (!channel)
+ goto fail;
+
+ err = host1x_hw_channel_init(host, channel, index);
+ if (err < 0)
+ goto fail;
+
+ /* Link device to host1x_channel */
+ channel->dev = dev;
+
+ /* Add to channel list */
+ list_add_tail(&channel->list, &host->chlist.list);
+
+ host->allocated_channels |= BIT(index);
+
+ mutex_unlock(&host->chlist_mutex);
+ return channel;
+
+fail:
+ dev_err(dev, "failed to init channel\n");
+ kfree(channel);
+ mutex_unlock(&host->chlist_mutex);
+ return NULL;
+}
+
+void host1x_channel_free(struct host1x_channel *channel)
+{
+ struct host1x *host = dev_get_drvdata(channel->dev->parent);
+
+ host->allocated_channels &= ~BIT(channel->id);
+ list_del(&channel->list);
+ kfree(channel);
+}