Terje Bergstrom | 6579324 | 2013-03-22 16:34:03 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Tegra host1x Channel |
| 3 | * |
| 4 | * Copyright (c) 2010-2013, NVIDIA Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/module.h> |
| 21 | |
| 22 | #include "channel.h" |
| 23 | #include "dev.h" |
| 24 | #include "job.h" |
| 25 | |
| 26 | /* Constructor for the host1x device list */ |
| 27 | int host1x_channel_list_init(struct host1x *host) |
| 28 | { |
| 29 | INIT_LIST_HEAD(&host->chlist.list); |
| 30 | mutex_init(&host->chlist_mutex); |
| 31 | |
| 32 | if (host->info->nb_channels > BITS_PER_LONG) { |
| 33 | WARN(1, "host1x hardware has more channels than supported by the driver\n"); |
| 34 | return -ENOSYS; |
| 35 | } |
| 36 | |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | int host1x_job_submit(struct host1x_job *job) |
| 41 | { |
| 42 | struct host1x *host = dev_get_drvdata(job->channel->dev->parent); |
| 43 | |
| 44 | return host1x_hw_channel_submit(host, job); |
| 45 | } |
Thierry Reding | fae798a | 2013-11-08 11:41:42 +0100 | [diff] [blame^] | 46 | EXPORT_SYMBOL(host1x_job_submit); |
Terje Bergstrom | 6579324 | 2013-03-22 16:34:03 +0200 | [diff] [blame] | 47 | |
| 48 | struct host1x_channel *host1x_channel_get(struct host1x_channel *channel) |
| 49 | { |
| 50 | int err = 0; |
| 51 | |
| 52 | mutex_lock(&channel->reflock); |
| 53 | |
| 54 | if (channel->refcount == 0) |
| 55 | err = host1x_cdma_init(&channel->cdma); |
| 56 | |
| 57 | if (!err) |
| 58 | channel->refcount++; |
| 59 | |
| 60 | mutex_unlock(&channel->reflock); |
| 61 | |
| 62 | return err ? NULL : channel; |
| 63 | } |
Thierry Reding | fae798a | 2013-11-08 11:41:42 +0100 | [diff] [blame^] | 64 | EXPORT_SYMBOL(host1x_channel_get); |
Terje Bergstrom | 6579324 | 2013-03-22 16:34:03 +0200 | [diff] [blame] | 65 | |
| 66 | void host1x_channel_put(struct host1x_channel *channel) |
| 67 | { |
| 68 | mutex_lock(&channel->reflock); |
| 69 | |
| 70 | if (channel->refcount == 1) { |
| 71 | struct host1x *host = dev_get_drvdata(channel->dev->parent); |
| 72 | |
| 73 | host1x_hw_cdma_stop(host, &channel->cdma); |
| 74 | host1x_cdma_deinit(&channel->cdma); |
| 75 | } |
| 76 | |
| 77 | channel->refcount--; |
| 78 | |
| 79 | mutex_unlock(&channel->reflock); |
| 80 | } |
Thierry Reding | fae798a | 2013-11-08 11:41:42 +0100 | [diff] [blame^] | 81 | EXPORT_SYMBOL(host1x_channel_put); |
Terje Bergstrom | 6579324 | 2013-03-22 16:34:03 +0200 | [diff] [blame] | 82 | |
| 83 | struct host1x_channel *host1x_channel_request(struct device *dev) |
| 84 | { |
| 85 | struct host1x *host = dev_get_drvdata(dev->parent); |
| 86 | int max_channels = host->info->nb_channels; |
| 87 | struct host1x_channel *channel = NULL; |
| 88 | int index, err; |
| 89 | |
| 90 | mutex_lock(&host->chlist_mutex); |
| 91 | |
| 92 | index = find_first_zero_bit(&host->allocated_channels, max_channels); |
| 93 | if (index >= max_channels) |
| 94 | goto fail; |
| 95 | |
| 96 | channel = kzalloc(sizeof(*channel), GFP_KERNEL); |
| 97 | if (!channel) |
| 98 | goto fail; |
| 99 | |
| 100 | err = host1x_hw_channel_init(host, channel, index); |
| 101 | if (err < 0) |
| 102 | goto fail; |
| 103 | |
| 104 | /* Link device to host1x_channel */ |
| 105 | channel->dev = dev; |
| 106 | |
| 107 | /* Add to channel list */ |
| 108 | list_add_tail(&channel->list, &host->chlist.list); |
| 109 | |
| 110 | host->allocated_channels |= BIT(index); |
| 111 | |
| 112 | mutex_unlock(&host->chlist_mutex); |
| 113 | return channel; |
| 114 | |
| 115 | fail: |
| 116 | dev_err(dev, "failed to init channel\n"); |
| 117 | kfree(channel); |
| 118 | mutex_unlock(&host->chlist_mutex); |
| 119 | return NULL; |
| 120 | } |
Thierry Reding | fae798a | 2013-11-08 11:41:42 +0100 | [diff] [blame^] | 121 | EXPORT_SYMBOL(host1x_channel_request); |
Terje Bergstrom | 6579324 | 2013-03-22 16:34:03 +0200 | [diff] [blame] | 122 | |
| 123 | void host1x_channel_free(struct host1x_channel *channel) |
| 124 | { |
| 125 | struct host1x *host = dev_get_drvdata(channel->dev->parent); |
| 126 | |
| 127 | host->allocated_channels &= ~BIT(channel->id); |
| 128 | list_del(&channel->list); |
| 129 | kfree(channel); |
| 130 | } |
Thierry Reding | fae798a | 2013-11-08 11:41:42 +0100 | [diff] [blame^] | 131 | EXPORT_SYMBOL(host1x_channel_free); |