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131 lines
3.1 KiB
131 lines
3.1 KiB
/* |
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* Tegra host1x Channel |
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* |
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* Copyright (c) 2010-2013, NVIDIA Corporation. |
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* |
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* This program is free software; you can redistribute it and/or modify it |
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* under the terms and conditions of the GNU General Public License, |
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* version 2, as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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* more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#include <linux/slab.h> |
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#include <linux/module.h> |
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#include "channel.h" |
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#include "dev.h" |
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#include "job.h" |
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/* Constructor for the host1x device list */ |
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int host1x_channel_list_init(struct host1x *host) |
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{ |
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INIT_LIST_HEAD(&host->chlist.list); |
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mutex_init(&host->chlist_mutex); |
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if (host->info->nb_channels > BITS_PER_LONG) { |
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WARN(1, "host1x hardware has more channels than supported by the driver\n"); |
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return -ENOSYS; |
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} |
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return 0; |
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} |
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int host1x_job_submit(struct host1x_job *job) |
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{ |
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struct host1x *host = dev_get_drvdata(job->channel->dev->parent); |
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return host1x_hw_channel_submit(host, job); |
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} |
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EXPORT_SYMBOL(host1x_job_submit); |
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struct host1x_channel *host1x_channel_get(struct host1x_channel *channel) |
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{ |
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int err = 0; |
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mutex_lock(&channel->reflock); |
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if (channel->refcount == 0) |
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err = host1x_cdma_init(&channel->cdma); |
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if (!err) |
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channel->refcount++; |
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mutex_unlock(&channel->reflock); |
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return err ? NULL : channel; |
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} |
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EXPORT_SYMBOL(host1x_channel_get); |
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void host1x_channel_put(struct host1x_channel *channel) |
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{ |
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mutex_lock(&channel->reflock); |
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if (channel->refcount == 1) { |
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struct host1x *host = dev_get_drvdata(channel->dev->parent); |
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host1x_hw_cdma_stop(host, &channel->cdma); |
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host1x_cdma_deinit(&channel->cdma); |
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} |
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channel->refcount--; |
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mutex_unlock(&channel->reflock); |
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} |
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EXPORT_SYMBOL(host1x_channel_put); |
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struct host1x_channel *host1x_channel_request(struct device *dev) |
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{ |
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struct host1x *host = dev_get_drvdata(dev->parent); |
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int max_channels = host->info->nb_channels; |
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struct host1x_channel *channel = NULL; |
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int index, err; |
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mutex_lock(&host->chlist_mutex); |
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index = find_first_zero_bit(&host->allocated_channels, max_channels); |
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if (index >= max_channels) |
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goto fail; |
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channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
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if (!channel) |
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goto fail; |
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err = host1x_hw_channel_init(host, channel, index); |
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if (err < 0) |
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goto fail; |
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/* Link device to host1x_channel */ |
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channel->dev = dev; |
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/* Add to channel list */ |
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list_add_tail(&channel->list, &host->chlist.list); |
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host->allocated_channels |= BIT(index); |
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mutex_unlock(&host->chlist_mutex); |
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return channel; |
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fail: |
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dev_err(dev, "failed to init channel\n"); |
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kfree(channel); |
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mutex_unlock(&host->chlist_mutex); |
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return NULL; |
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} |
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EXPORT_SYMBOL(host1x_channel_request); |
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void host1x_channel_free(struct host1x_channel *channel) |
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{ |
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struct host1x *host = dev_get_drvdata(channel->dev->parent); |
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host->allocated_channels &= ~BIT(channel->id); |
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list_del(&channel->list); |
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kfree(channel); |
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} |
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EXPORT_SYMBOL(host1x_channel_free);
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